Keeping of permanent colour in led lighting device containing different types of leds

FIELD: electricity.

SUBSTANCE: invention relates to lighting. Result is ensured by that the lighting device contains multiple LEDs connected in series. In the lighting device the first set of LEDs has first type LEDs, having first output of the light flow decrease as first function of the junction temperature. The second set of LEDs has second type LEDs having second output of the light flow decreased as second function of their junction temperature that differs from the first function. At least one first type LED and one second type LED are connected in parallel to the resistors set with resistance depending on the temperature. The resistance temperature dependence stabilizes ratio of the first light flow output to the second light flow output at different junction temperatures of the first set of LEDs and second set of LEDs.

EFFECT: prevention of change of ratio of light flow output of various types LEDs as part of same lighting device.

13 cl, 11 dwg

 

The technical field TO WHICH the INVENTION RELATES

The invention relates to the technical field of light-emitting diode, LED lighting, specifically led lighting device containing different types of LEDs and having a layout scheme to maintain the uniformity of color at different operating temperatures of the transition.

The prior art INVENTIONS

In the led lighting device can be applied to a set of LEDs. In the led lighting device, which is either designed for on and off, or is intended for applications decrease the brightness, the LEDs of different types can be combined to obtain a light output having a predetermined color at steady-state conditions. As an example, when combining LEDs of type InGaN with LEDs type AlInGaP can be made efficient led lighting device in the range of low correlated color temperature, CCT (2500-3000 K).

It is known that the output of the light flux at the light emitting diode, also called an exit light flux, light output or luminosity, varies with its temperature of transition. When the junction temperature increases, the output light flux is reduced. This phenomenon will be called by the deterioration of the output light flux.

P�and the use of different types of LEDs in the lighting device has a problem, when the LEDs of the same type show a different output degradation of luminous flux depending on their transition temperature than the LEDs of a different type. Different deterioration of the output luminous flux can lead to different ratios of output light flux from different types of LEDs in General lighting outlet led lighting device, and therefore, when the LEDs emit different types of light of different colors, it can lead to the fact that the lighting device emits different colors of light at different junction temperature of LEDs. It is undesirable.

This problem usually offer a feedback loop with a temperature sensor and a microprocessor to control the magnitude of the electric power supply to at least one or some of the LEDs to maintain the colour of the light output from the lighting device in a predetermined range by observing the relationship of the exit light flux from different types of LEDs essentially constant at different temperatures of the transition, which is measured by the temperature sensor.

WO 2004/047498 reveals a light body containing a number of LEDs. One or more temperature compensation circuits connected to the respective number of series-connected St�of todito to regulate the current in the diodes, depending on the temperature.

Summary of the INVENTION

It would be desirable to provide an led lighting device comprising LEDs of different types, and the method of its production, in which device the ratio of the exit light flux from different types of LEDs can be maintained essentially constant at different temperatures by using a simple layout scheme.

To better address this issue, in the first aspect of the invention is provided a lighting device comprising a plurality of LEDs, wherein the lighting device comprises: first Assembly of LEDs containing at least one led of the first type having a first variable output of luminous flux depending on its transition temperature; a second Assembly of LEDs containing at least one led of the second type having a second AC output of luminous flux depending on its transition temperature different from that of the first output light flux in the first Assembly of LEDs depending on its transition temperature, where the first Assembly of the LEDs are connected in series to the second Assembly of the LEDs, and where at least one of the LEDs of the first type and the LEDs of the second type connected in parallel to a resistor Assembly having a temperature-dependent resistance, and temperature�I the dependence of the resistance adapts to stabilize in a predetermined range of the relationship of the first output light flux to the second output of the light flux at different temperatures of transition from the first Assembly of LEDs and the second Assembly of the LEDs.

In a second aspect of the invention provides a method of manufacturing a lighting device comprising a plurality of LEDs, the method includes: providing a first Assembly of LEDs containing at least one led of the first type having a first variable output of luminous flux depending on its transition temperature; providing a second Assembly of LEDs containing at least one led of the second type having a second AC output of luminous flux depending on its transition temperature different from that of the first output light flux in the first Assembly of LEDs depending on its transition temperature; connecting the first Assembly of LEDs sequentially to the second Assembly of LEDs; connecting at least one of the LEDs of the first type and the LEDs of the second type in parallel to a resistor Assembly having a temperature-dependent resistance; and fitting the temperature dependence of the resistance for stabilizing a predetermined range of the relationship of the first output light flux to the second output of the light flux at different temperatures of transition from the first Assembly of LEDs and the second Assembly of the LEDs.

The invention provides a relatively simple � cheap lighting device, which can be powered from a DC source without the use of any feedback control to generate light with constant color variables when the junction temperature of the LEDs.

Within the scope of the invention, the resistor Assembly may be connected in parallel to one first led of the first type, possibly with other LEDs of the first type connected in series to the first led of the first type, having connected in parallel to the resistor Assembly. Resistor Assembly can also connect simultaneously to multiple series connected LEDs of the first type, possibly with other LEDs of the first type connected in series to the multiple series-connected LEDs of the first type, having connected in parallel to the resistor Assembly. You can also create a combination of the previous schemes. Alternatively, each of the plurality of series connected LEDs of the first type may be connected in parallel to the resistor Assembly.

A variety of combinations of schemes, including one or more resistor assemblies described above for one or more series connected LEDs of the first type, it is also possible for one or more consecutive under�switched on, LEDs of the second type. You can also create a combination of the variety of configurations of circuits comprising one or more resistor assemblies for one or more series connected LEDs of the first type and one or more resistor assemblies for one or more series connected LEDs of the second type.

Resistor Assembly has a temperature-dependent resistance, which is intended to compensate for, among other things, the difference between the output of the luminous flux/temperature characteristics transition of led of the first type and the LEDs of the second type. In practice, the resistor Assembly may include a single resistor or multiple resistors connected in series, in parallel or partly in series and partly in parallel to each other to achieve the proper characteristics of the temperature-dependent resistance.

In a variant implementation, when the first output light flux decreases with increase in the transition temperature of the first Assembly of LEDs with a first speed and the second output light flux decreases with increase in the transition temperature of the second Assembly of LEDs with a second speed below the first speed, the first resistor Assembly can be connected in parallel to at least one led in the first Assembly of LEDs, and resistance�Linux first resistor Assembly increases with increasing the temperature of the first resistor Assembly (behavior with a positive temperature coefficient, PTC, the first resistor Assembly, where the temperature coefficient may or may not be constant in the relevant temperature range). At a nominal operating temperature of the first and second assemblies of LEDs (at rated current) the ratio of the outputs of the light fluxes from the first and second assemblies of LEDs provides a predetermined color of light emitted by the lighting device. At temperatures below the rated operating temperature of the first and second LEDs and assemblies without correction, the ratio of light emitted by the first Assembly of LEDs is increased relative to the ratio of light emitted by the second Assembly of the LEDs. Thus, at these temperatures below the rated operating temperature, the current through the first Assembly of LEDs can be reduced to reduce the ratio of light emitted by the first Assembly of the LEDs to keep the ratio of the light fluxes from the first and second assemblies of LEDs constant or at least in a certain range, or to preserve the colour of the light radiated by the illuminating device, in a certain range (for example, to color shift was less than a pre-set number of standard deviation units align the colors, SDCM, for example 7 that is acceptable to the human eye). The first resistor Assembly having a behavior with a positive story�tion temperature coefficient, corrects this by having a smaller resistance and therefore the consumption of more current at lower temperatures, which leads to the desired decrease of the current through the first Assembly of LEDs at lower temperatures. Accordingly, the color of the light emitted by the lighting device, it is possible to maintain substantially the same at different temperatures.

Instead of the first resistor Assembly, or in combination with the first resistor, the second Assembly resistor Assembly can be connected in parallel to at least one second led Assembly of the led, the resistance of the second resistor Assembly decreases with increase in the temperature of the second resistor Assembly (behavior with a negative temperature coefficient, NTC, the second resistor Assembly, where the temperature coefficient may or may not be constant in the relevant temperature range). At temperatures below the rated operating temperature of the first and second assemblies of LEDs without correction increases the ratio of light emitted by the first Assembly of LEDs, relative to the ratio of light emitted by the second Assembly of the LEDs. Thus, at these temperatures below the rated operating temperature, the current through the second Assembly of LEDs can be increased to increase the ratio of light emitted by the WTO�Oh Assembly of LEDs, to keep the ratio of the light fluxes from the first and second assemblies of LEDs constant or at least in a certain range or to keep the colour of the light radiated by the illuminating device, in a certain range (for example, to color shift was less than a pre-assigned amount units SDCM, for example 7 that is acceptable to the human eye). The second resistor Assembly having a behavior with a negative temperature coefficient, corrects this by having more resistance and therefore a smaller consumption current at lower temperatures, which leads to the desired increase of the current through the second Assembly of the LEDs.

Combined use of the first resistor Assembly with the behavior with a positive temperature coefficient and the second resistor Assembly with the behavior with a negative temperature coefficient of correcting the influence of the first and second resistor assemblies to the outputs of their respective light fluxes of the first and second assemblies of LEDs may be less than in the case where there would be no one of the first resistor Assembly and the second resistor Assembly.

In the third aspect of the present invention provides a lighting kit containing: control the brightness of the light having a specified findings, adapted to connect Istochnik power supply, and the dimmer lights has output terminals adapted to provide alternating current; and an led lighting device in accordance with the first aspect of the invention, wherein the lighting device has terminals adapted to connect to the output terminals of the dimmer lights.

These and other aspects of the invention will be easier to perceive, as they will become clearer when referring to the following detailed description when considering in relation to the annexed drawings, in which identical reference position indicate identical parts.

BRIEF description of the DRAWINGS

Fig.1 depicts graphs of the relationship between the normalized output of the light flux (vertical axis, the lumen/milliwatts) and transition temperature (horizontal axis, °C) for different LEDs of the first type.

Fig.2 depicts graphs of the relationship between the normalized output of the light flux (vertical axis, the lumen/milliwatts) and transition temperature (horizontal axis, °C) for different LEDs of the second type.

Fig.3 depicts a graph of the relationship between the relative deviation of the light fluxes relations (vertical axis, dimensionless) and transition temperature (horizontal axis, °C) lighting device comprising LEDs of the first type � LEDs of the second type, without corrective action in accordance with the present invention.

Fig.4a, 4b, 4c and 4d depict schematic diagrams of different embodiments of an led lighting device in accordance with the present invention, where an implementation option on Fig.1a is connected to the current source.

Fig.5a, 5b, 5c and 5d shows an additional schematic diagrams of other embodiments of an led lighting device in accordance with the present invention.

DETAILED DESCRIPTION of embodiments of

For the led change of the output FO of the light flux can be characterized by the so-called coefficient of temperature dependence of light output, indicating the percentage of loss of the light flux from the transition temperature of 25°C to 100°C at the led. This is illustrated with reference to Fig.1 and 2.

Fig.1 depicts graphs of the output FO1 of the light flux at variable temperatures T transition at different LEDs of the first type, for example LEDs type AlInGaP. The first graph 11 illustrates the reduction of an output FO1 of the light flux with increasing temperature T of transition for the red photometric led. The second graph 12 illustrates a more abrupt decrease of the output FO1 of the light flux than schedule 21, by increasing the temperature T of the transition to red-orange photometric led. Tert�th figure 13 illustrates a more drastic reduction of output FO1 of the light flux, than schedules 11 and 12, by increasing the temperature T of the transition to amber photometric led.

Fig.2 illustrates graphs of output FO2 of the light flux at variable temperatures T transition at different LEDs of the second type, for example LEDs type InGaN. The first graph 21 illustrates the reduction of an output FO2 of the light flux with increasing temperature T of the transition to blue luminosity led. The second graph 22 illustrates a slightly steeper decrease output FO2 of the light flux than schedule 21, with increasing temperature T for green photometric led. The third graph 23 illustrates even more abrupt decrease of the output FO2 of the light flux than the graphs 21 and 22, by increasing the temperature T for the bright blue radiometric led. The fourth graph 24 illustrates even more abrupt decrease of the output FO2 of the light flux than graphics 21, 22 or 23, with increasing temperature T for white photometric led. The fifth figure 25 illustrates another slightly steeper decrease output FO2 of the light flux than the graphs 21, 22, 23 or 24, with increasing temperature T for blue photometric led.

Fig.1 and 2 show that the led of the first type has a higher coefficient of temperature dependence of light output than the led of the second type, indicating that the gradient of the input�and luminous flux depending on the temperature at the light emitting diode of the first type above the gradient of the output of luminous flux depending on the temperature at the light emitting diode of the second type.

It is assumed that the LEDs of the first type, which is illustrated in Fig.1, and the LEDs of the second type, which is illustrated in Fig.2, are used to create a lighting device that contains a serial connection of the first Assembly of LEDs, containing serially connected LEDs of the first type and second assemblies of LEDs containing serially connected LEDs of the second type. Moreover, as an example, it is assumed that the combination of the first Assembly of LEDs and the second Assembly of the LEDs is designed so that at maximum junction temperature 100°C, the current through the LEDs of the first type and the LEDs of the second type are essentially the same. Note that other versions can lead to different maximum temperatures of the transition.

From Fig.1 shows that at 100°C, the led of the first type generates approximately 50% of the luminous flux at 20°C (room temperature). From Fig.2 that at 100°C, the led of the second type generates approximately 85% of the luminous flux at room temperature. Assuming a linear relationship between current and luminous flux for each led type, it follows that, in order to maintain the ratio of the light fluxes from the lighting device is approximately the same at 20°C and at 100°C, the current through the second sat�, ar LEDs should be reduced by a factor of approximately 0.5/0.85 at room temperature, either the current through the first Assembly of the LEDs should be increased by a factor of approximately 0.85 mm/0.5 at room temperature. For other transition temperatures apply other correction factors that can be derived from Fig.3, showing the relative deviation of FO1/FO2 relations of light fluxes at different temperatures T of the transition.

As illustrated in Fig.4a, 4b, 4c and 4d, the source 40 of direct or alternating current, which can include control the brightness of the light and generates a current I, has (two) output output connected to (two) the input terminals 41a, 41b of the led lighting device 42, generally indicated by the dotted line. In order to reduce the brightness of the source 40 current may have a pulse width control. Junction temperature of the led will decrease with decreasing brightness.

Referring to Fig.4a, the lighting device 42 comprises a first Assembly 43a LEDs indicated by the dotted line, and a second Assembly 44a LEDs indicated by the dotted line, is connected in series to the first Assembly 43a LEDs through node 45 connecting the first cathode Assembly 43a of the led with the anode of the second Assembly 44a LEDs. Serial connection of the first Assembly LEDs 43a and second assemblies 44a of LEDs is connected between input pins 41a, 41b led WWS�plant device 42. Each of the first Assembly LEDs 43a and second assemblies 44a contains LEDs single led, where the led in the first Assembly 43a LEDs belongs to the first type and the second led Assembly 44a LEDs belongs to the second type. The led of the first type has a variable the first output of luminous flux depending on its transition temperature, whereas the led of the second type has a variable second output of luminous flux depending on the transition temperature, and this dependence is different from the first output light flux at the light emitting diode of the first type depending on the transition temperature.

The led of the first type connected in parallel to the resistor Assembly 46, generally indicated by the dotted line. Thus, the resistor Assembly 46, which in the variant of implementation may include a single resistor 47, but can also contain several resistors (resistor circuit), is connected between the input output 41a and the node 45.

Referring to Fig.4b, a lighting device 42 comprises a first Assembly 43b LEDs indicated by the dotted line, and a second Assembly 44b LEDs indicated by the dotted line, is connected in series to the first Assembly 43b LEDs through node 45 connecting the first cathode Assembly 43b of LEDs with a second anode Assembly 44b LEDs. Consistent�mounting the first Assembly 43b of LEDs and the second Assembly 44b of LEDs is connected between input pins 41a, 41b of the led lighting device 42. Each or at least one of the first Assembly 43b of LEDs and the second Assembly 44b LEDs contains more than one led, connected in series to each other to create a chain of LEDs, where the LEDs of the first Assembly 43b LEDs refer to the first type, and the LEDs of the second Assembly 44b LEDs belong to the second type. The led of the first type has a variable the first output of luminous flux depending on its transition temperature, whereas the led of the second type has a variable second output of luminous flux depending on its transition temperature, and this dependence is different from the first output light flux at the light emitting diode of the first type depending on its transition temperature.

At least one of the LEDs of the first type connected in parallel to the resistor Assembly 46, generally indicated by the dotted line. Thus, the resistor Assembly 46, which in the variant of implementation may include a single resistor 47, but can also contain several resistors (resistor circuit), is connected between the input output 41a on one side and a node between two consecutive LEDs in the chain of LEDs of the first type with the other hand. Alternatively, the resistor Assembly 46 can�t be connected between the node 45 on one side and a node between two consecutive LEDs in the chain of LEDs of the first type with the other hand. As a further alternative, the resistor Assembly 46 may be connected between the node between two consecutive LEDs in the chain of LEDs of the first type on one side and another node between two consecutive LEDs in the chain of LEDs of the first type with the other hand.

Referring to Fig.4c, a lighting device 42 comprises a first Assembly 43c LEDs indicated by the dotted line, and a second Assembly 44c LEDs indicated by the dotted line, is connected in series to the first Assembly 43c LEDs through node 45 connecting the first cathode Assembly 43c of LEDs with a second anode Assembly 44c LEDs. Serial connection of the first Assembly 43c of LEDs and the second Assembly 44c of LEDs is connected between input pins 41a, 41b of the led lighting device 42. Each or at least one of the first Assembly 43c of LEDs and the second Assembly 44c LEDs contains more than one led, connected in series to each other to create a chain of LEDs, where the LEDs of the first Assembly 43c LEDs refer to the first type, and the LEDs of the second Assembly 44c LEDs belong to the second type. The led of the first type has a variable the first output of luminous flux depending on its transition temperature, whereas led ceiling lamp with LON� second type has a variable second output of luminous flux depending on its transition temperature, however, this dependence is different from the first output light flux at the light emitting diode of the first type depending on its transition temperature.

At least one of the LEDs of the first type connected in parallel to the resistor Assembly 46, generally indicated by the dotted line. Thus, the resistor Assembly 46, which in the variant of implementation may include a single resistor 47, but can also contain several resistors (resistor circuit), is connected between the input output 41a and the node 45.

Referring to Fig.4d, a lighting device 42 comprises a first Assembly 43d LEDs indicated by the dotted line, and a second Assembly 44d LEDs indicated by the dotted line, is connected in series to the first Assembly 43d LEDs through node 45 connecting the first cathode Assembly 43d light emitting diodes with the anode of the second Assembly 44d LEDs. Serial connection of the first Assembly 43d of LEDs and the second Assembly 44d of LEDs is connected between input pins 41a, 41b of the led lighting device 42. Each or at least one of the first Assembly 43d of LEDs and the second Assembly 44d LEDs contains more than one led, connected in series to each other to create a chain of LEDs, where the LEDs of the first Assembly 43d LEDs refer to the first type, and�modity second Assembly 44d LEDs belong to the second type. The led of the first type has a variable the first output of luminous flux depending on its transition temperature, whereas the led of the second type has a variable second output of luminous flux depending on its transition temperature, and this dependence is different from the first output light flux at the light emitting diode of the first type depending on its transition temperature.

Each of the LEDs in the first Assembly 43d of LEDs is connected in parallel to a resistor Assembly 46a, ..., 46b, respectively, generally indicated by the dotted line. Thus, the (first) resistor Assembly 46a, which in the variant of implementation may include a single resistor 47a, but can also contain several resistors (resistor circuit) has one end connected to the input terminal 41a, and (last) resistor Assembly 46b, which in the variant of implementation may include a single resistor 47b, but can also contain several resistors (resistor circuit) has one end connected to the node 45.

Assuming that in embodiments of the lighting device 42, which is shown in Fig.4a, 4b, 4c and 4d, the LEDs of the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively have the output of the light flux, which decreases with increasing temperature, the transition from the first speed, whereas the LEDs in�ora assemblies 44a, 44b, 44c and 44d LEDs respectively have the output of the light flux, which decreases with increasing temperature, the transition from the second speed which is lower than the first speed, the resistance of the resistor Assembly 46, 46a and 46b, respectively, is adapted to increase with increasing temperature, the resistor Assembly 46, 46a, 46b, respectively, to stabilize, within a predetermined range, the ratio of the exit light flux from the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively to the output of the light flux from the second Assembly 44a, 44b, 44c and 44d of the LEDs, respectively, at different temperatures of transition from the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively, and second assemblies 44a, 44b, 44c and 44d of the LEDs, respectively. With increasing temperature the transition from the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively, and second assemblies 44a, 44b, 44c and 44d of the LEDs, respectively, also increasing the temperature of the resistor Assembly 46, 46a and 46b, respectively. As a result, the resistance of the resistor Assembly 46, 46a and 46b, respectively, is increased, and a relatively large current flows in the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively, resulting in an increase (in fact, a smaller decrease than in the case when there would be no resistor Assembly) of the exit light flux from the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively, while less� the current flows in the resistor Assembly 46, 46a and 46b, respectively, connected in parallel thereto, and then remains constant as the current in the second Assembly 44a, 44b, 44c and 44d of the LEDs, respectively.

Alternatively, assuming that in embodiments of the lighting device 42, which is shown in Fig.4a, 4b, 4c and 4d, the LEDs of the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively have the output of the light flux, which decreases with increasing temperature, the transition from the first speed while the LEDs of the second Assembly 44a, 44b, 44c and 44d LEDs respectively have the output of the light flux, which decreases with increasing temperature, the transition from the second speed which is higher than the first speed, the resistance of the resistor Assembly 46, 46a, ..., 46b respectively adapted to decrease with increasing temperature, the resistor Assembly 46, 46a, ..., 46b, respectively, to stabilize, in a predetermined range, the ratio of the exit light flux from the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively to the output of the light flux from the second Assembly 44a, 44b, 44c and 44d of the LEDs, respectively, at different temperatures of transition from the first Assembly of LEDs and the second Assembly of the LEDs. With increasing temperature the transition from the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively, and second assemblies 44a, 44b, 44c and 44d of the LEDs accordingly also raste� the temperature of the resistor Assembly 46, 46a and 46b, respectively. In this case, as a result, the resistance of the resistor Assembly 46, 46a and 46b, respectively, is reduced, and a relatively smaller current flows in the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively, leading to a decrease (in fact to a greater reduction than in the case when there would be no resistor Assembly) of the exit light flux from the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively, while a large current flows in the resistor Assembly 46, 46a and 46b, respectively, connected in parallel thereto, and then remains constant as the current in the second Assembly 44a, 44b, 44c and 44d of the LEDs, respectively.

Example of types of light emitting diodes having a first and second speed reduction of the output light flux by increasing the transition temperature, LEDs are type and type AlInGaP InGaN, respectively.

In the lighting device 42 LEDs can be mounted on a common heat sink to have a thermal coupling of the transitions of the first Assembly of LEDs and the second Assembly of the LEDs. Similarly, the resistor Assembly or Assembly in a lighting device have thermal communication with an associated led or Assembly of LEDs or a part of it, in particular with their transitions, for example, by mounting on a common heat sink. Thus, the temperature of the led transitions and resistor Assembly or Assembly and� essentially identical or at least adhere to each other.

Referring to Fig.5a, the lighting device 42 comprises a first Assembly 43a LEDs indicated by the dotted line, and a second Assembly 44a LEDs indicated by the dotted line, is connected in series to the first Assembly 43a LEDs through node 45 connecting the first cathode Assembly 43a of the led with the anode of the second Assembly 44a LEDs. Serial connection of the first Assembly LEDs 43a and second assemblies 44a of LEDs is connected between input pins 41a, 41b of the led lighting device 42. Each of the first Assembly LEDs 43a and second assemblies 44a contains LEDs single led, where the led in the first Assembly 43a LEDs belongs to the first type and the second led Assembly 44a LEDs belongs to the second type. The led of the first type has a variable the first output of luminous flux depending on its transition temperature, whereas the led of the second type has a variable second output of luminous flux depending on its transition temperature, and this dependence is different from the first output light flux at the light emitting diode of the first type depending on its transition temperature.

The led of the first type connected in parallel to the resistor Assembly 46, generally indicated by the dotted line. Thus, the resistor Assembly 46, which in the variant� implementation may include a single resistor 47, but can also contain several resistors (resistor circuit), is connected between the input output 41a and the node 45.

The led of the second type connected in parallel to the resistor Assembly 48, generally indicated by the dotted line. Thus, the resistor Assembly 48, which in the variant of implementation may include a single resistor 49, but may also contain several resistors (resistor circuit), is connected between the input output 41b and the node 45.

Referring to Fig.5b, the lighting device 42 comprises a first Assembly 43b LEDs indicated by the dotted line, and a second Assembly 44b LEDs indicated by the dotted line, is connected in series to the first Assembly 43b LEDs through node 45 connecting the first cathode Assembly 43b of LEDs with a second anode Assembly 44b LEDs. Serial connection of the first Assembly 43b of LEDs and the second Assembly 44b of LEDs is connected between input pins 41a, 41b of the led lighting device 42. Each or at least one of the first Assembly 43b of LEDs and the second Assembly 44b LEDs contains more than one led, connected in series to each other to create a chain of LEDs, where the LEDs of the first Assembly 43b LEDs refer to the first type, and the LEDs of the second Assembly 44b LEDs apply to �asking type. The led of the first type has a variable the first output of luminous flux depending on its transition temperature, whereas the led of the second type has a variable second output of luminous flux depending on its transition temperature, and this dependence is different from the first output light flux at the light emitting diode of the first type depending on its transition temperature.

At least one of the LEDs of the first type connected in parallel to the resistor Assembly 46, generally indicated by the dotted line. Thus, the resistor Assembly 46, which in the variant of implementation may include a single resistor 47, but can also contain several resistors (resistor circuit), is connected between the input output 41a on one side and a node between two consecutive LEDs in the chain of LEDs of the first type with the other hand. Alternatively, the resistor Assembly 46 may be connected between the node 45 on one side and a node between two consecutive LEDs in the chain of LEDs of the first type with the other hand. As a further alternative, the resistor Assembly 46 may be connected between the node between two consecutive LEDs in the chain of LEDs of the first type on one side and another node between two consecutive Svetov�DAMI in the chain of LEDs of the first type with the other hand.

At least one of the LEDs of the second type connected in parallel to the resistor Assembly 48, generally indicated by the dotted line. Thus, the resistor Assembly 48, which in the variant of implementation may include a single resistor 49, but may also contain several resistors (resistor circuit), is connected between the input output 41b on one side and a node between two consecutive LEDs in the chain of LEDs of the second type with the other hand. Alternatively, the resistor Assembly 48 can be connected between the node 45 on one side and a node between two consecutive LEDs in the chain of LEDs of the second type with the other hand. As a further alternative, the resistor Assembly 48 can be connected between the node between two consecutive LEDs in the chain of LEDs of the second type on one side and another node between two consecutive LEDs in the chain of LEDs of the second type with the other hand.

Referring to Fig.5c, a lighting device 42 comprises a first Assembly 43c LEDs indicated by the dotted line, and a second Assembly 44c LEDs indicated by the dotted line, is connected in series to the first Assembly 43c LEDs through node 45 connecting the first cathode Assembly 43c of LEDs with a second anode Assembly 44c St�of todito. Serial connection of the first Assembly 43c of LEDs and the second Assembly 44c of LEDs is connected between input pins 41a, 41b of the led lighting device 42. Each or at least one of the first Assembly 43c of LEDs and the second Assembly 44c LEDs contains more than one led, connected in series to each other to create a chain of LEDs, where the LEDs of the first Assembly 43c LEDs refer to the first type, and the LEDs of the second Assembly 44c LEDs belong to the second type. The led of the first type has a variable the first output of luminous flux depending on its transition temperature, whereas the led of the second type has a variable second output of luminous flux depending on its transition temperature, and this dependence is different from the first output light flux at the light emitting diode of the first type depending on its transition temperature.

At least one of the LEDs of the first type connected in parallel to the resistor Assembly 46, generally indicated by the dotted line. Thus, the resistor Assembly 46, which in the variant of implementation may include a single resistor 47, but can also contain several resistors (resistor circuit), is connected between the input output 41a and the node 45.

At least one of SV�of todito second type is connected in parallel to the resistor Assembly 48, in General indicated by the dotted line. Thus, the resistor Assembly 48, which in the variant of implementation may include a single resistor 49, but may also contain several resistors (resistor circuit), is connected between the input output 41b and the node 45.

Referring to Fig.5d, a lighting device 42 comprises a first Assembly 43d LEDs indicated by the dotted line, and a second Assembly 44d LEDs indicated by the dotted line, is connected in series to the first Assembly 43d LEDs through node 45 connecting the first cathode Assembly 43d light emitting diodes with the anode of the second Assembly 44d LEDs. Serial connection of the first Assembly 43d of LEDs and the second Assembly 44d of LEDs is connected between input pins 41a, 41b of the led lighting device 42. Each or at least one of the first Assembly 43d of LEDs and the second Assembly 44d LEDs contains more than one led, connected in series to each other to create a chain of LEDs, where the LEDs of the first Assembly 43d LEDs refer to the first type, and the LEDs of the second Assembly 44d LEDs belong to the second type. The led of the first type has a variable the first output of luminous flux depending on its transition temperature, whereas the led of the second type has a second AC input� of luminous flux depending on its transition temperature, however, this dependence is different from the first output light flux at the light emitting diode of the first type depending on its transition temperature.

Each of the LEDs in the first Assembly 43d of LEDs is connected in parallel to a resistor Assembly 46a, ..., 46b, respectively, generally indicated by the dotted line. Thus, the (first) resistor Assembly 46a, which in the variant of implementation may include a single resistor 47a, but can also contain several resistors (resistor circuit) has one end connected to the input terminal 41a, and (last) resistor Assembly 46b, which in the variant of implementation may include a single resistor 47b, but can also contain several resistors (resistor circuit) has one end connected to the node 45.

Each of the LEDs in the second Assembly 44d of LEDs is connected in parallel to a resistor Assembly 48a, and 48b, respectively, generally indicated by the dotted line. Thus, the (first) resistor Assembly 48a, which in the variant of implementation may include a single resistor 49a, but can also contain several resistors (resistor circuit) has one end connected to the input terminal 41b, and (last) resistor Assembly 48b, which in the variant of implementation may include a single resistor 49b, but can also contain multiple re�of Vtorov (resistor circuit), has one end connected to the node 45.

Assuming that in embodiments of the lighting device 42, which is shown in Fig.5a, 5b, 5c and 5d, the LEDs of the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively have the output of the light flux, which decreases with increasing temperature, the transition from the first speed while the LEDs of the second Assembly 44a, 44b, 44c and 44d LEDs respectively have the output of the light flux, which decreases with increasing temperature, the transition from the second speed which is lower than the first speed, the resistance of the resistor Assembly 46, 46a, ..., 46b, respectively, is adapted to increase with increasing temperature, the resistor Assembly 46, 46a, ..., 46b, respectively, whereas the resistance of the resistor Assembly 48, 48a, and 48b, respectively, is adapted to decrease with increasing temperature, the resistor Assembly 48, 48a, and 48b, respectively, to stabilize, within a predetermined range, the ratio of the exit light flux from the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively to the output of the light flux from the second Assembly 44a, 44b, 44c and 44d of the LEDs, respectively, at different temperatures of transition from the first Assembly of LEDs and the second Assembly of the LEDs. With increasing temperature the transition from the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively, and second assemblies 44a, 44b, 44c and 44d thus also increasing the temperature of the resistor Assembly 46, 46a, 46b ... respectively and resistor Assembly 48, 48a, 48b.... As a result, the resistance of the resistor Assembly 46, 46a, ..., 46b, respectively, is increased, and a relatively large current flows in the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively, resulting in an increase (in fact, a smaller decrease than in the case when there would be no resistor Assembly) of the exit light flux from the first Assembly 43a, 43b, 43c and 43d of the LEDs respectively, while less current flows in the resistor Assembly 46, 46a, ..., 46b, respectively, connected in parallel thereto. Also the resistance of the resistor Assembly 48, 48a, and 48b, respectively, is reduced, and a relatively smaller current flows in the second Assembly 44a, 44b, 44c and 44d of the LEDs respectively, leading to a decrease (in fact to a greater reduction than in the case when there would be no resistor Assembly) of the exit light flux from the second Assembly 44a, 44b, 44c and 44d of the LEDs respectively, while a large current flows in the resistor Assembly 48, 48a, and 48b, respectively, connected in parallel thereto.

As an example of the way design to determine the temperature dependence of the first resistor Assembly and the second resistor Assembly, for example, the first resistor Assembly 46 and the second resistor Assembly 48 in the lighting device 42 shown in Fig.5c, the following recommendations give the desired re�ultat.

The goal is to keep constant the ratio of the light flux between the first Assembly 43c of LEDs and the second Assembly 44c LEDs. Luminous flux of each of the first Assembly of LEDs and the second Assembly of the LEDs can be described using the nominal value and temperature and current dependencies:

φi=φi,0fi(Ii,ΔTi),

whereφi- full luminous flux of the i-th Assembly of LEDs. Subscript 0 denotes the nominal value,ΔTi=TiTi,0. Temperature Tirefers to the (average) junction temperature of the LEDs in the i-th Assembly of LEDs. The function f is a function that describes the behavior of the luminous flux of the LEDs in the i-th Assembly of the LEDs depending on temperature and current.

In accordance with the present invention, the flux ratio between the average output of the light flux LEDs in the first and second assembling LEDs with�should be maintained (C):

φ1φ2=C

This leads to a clear linkI1depending onI2andΔT. In addition, a total current Itot in each Assembly LEDs the following simple relationship:

Itot=I1+IR,1=I2+IR,2

By definition, the voltage on the Assembly of LEDs Vf,i is equal to IR,i·R(∆T)i, where Vf,i is the voltage at the i-th Assembly of LEDs, and R(∆TR,i)i - temperature-dependent resistance of the circuit, parallel to the i-th Assembly of LEDs, where ∆TR,i is the temperature at the resistor Assembly is parallel to the i-th Assembly of the LEDs.

Generally, temperatures are related through the correlation matrix of thermal resistances Rth:

ΔT1=ΔTsink+R th,1,1PLED,1+Rth,1,2PLED,2+RthA ,1R1PR,1+RthA ,1R2PR,2

ΔT2=ΔTsink+Rth,2,1PLED,1+Rth,2,2PLED,2+Rth,2,R1PR,1+Rth,2,R2PR,2

ΔTR1=ΔTsink+Rth,R1,1PLED,1+Rth,R1,2PLED ,2+Rth,R1,R1PR,1+Rth,R1,R2PR,2

ΔTR2=ΔTsink+Rth,R2,1PLED,1+Rth,R2,2PLED,2+Rth,R2,R1PR,1+Rth,R2,R2PR,2

where PLED,i is the ambient heat of the i-th Assembly of LEDs, and PR,i is the ambient heat of the i-th resistor Assembly. The values of thermal resistance Rth can be defined in the test installation. The last equations are:

Vf,i=gi(Ii,ΔTi)

Vf,i=R(ΔTR,i)iIR,i

where gi- function that describes forward voltage of the led depending on the current I and temperature T.

The last step is to define the current through one of the assemblies of LEDs at a certain temperature and setting the full current. The full system of equations can be solved using iteration. The only solution is detected, if the set temperature one resistor assemblies.

As explained above, in accordance with the present invention the lighting device comprises a set of LEDs connected in series. In the lighting device of the first Assembly of LEDs includes LEDs of the first type, having a first output light flux, decreasing in the first function of junction temperature. The second Assembly of LEDs includes LEDs of the second type having a second output light flux decreases as a function of their transition temperature that is different from the first function. At least one of the LEDs of the first type and the LEDs of the second type connects p�parallel to a resistor Assembly, having temperature-dependent resistance. The temperature dependence of the resistance stabilizes the ratio of the first output light flux to the second output of the light flux at different temperatures of transition from the first Assembly of LEDs and the second Assembly of the LEDs.

A lighting device of the present invention is illustrated with reference to the Assembly of LEDs of two different types. However, the lighting device may further comprise one or more other types of LEDs, different from the first type and second type.

This document describes the detailed embodiments of the present invention; however, it should be understood that disclosed embodiments of are merely examples of the invention that may be implemented in various forms. Therefore, specific structural and functional details disclosed within this document should not be interpreted as limiting, but merely as a basis for the claims and as a basis for training of specialist in this field of technology to different application of the present invention on the merits in any appropriately detailed structure. Moreover, used in this document, the terms and phrases are not intended to be limiting, but rather PR�to deliver understandable description of the invention.

The signs of the singular when used in this document are defined as "one" or "more than one". The term "lot" when used in this document is defined as "two" or "two more". The term "other" when used in this document is defined as "at least a second or further". The terms "including" and/or "having" when used in this document are defined as "containing" (i.e. open-ended formulation, which does not exclude other elements or steps). Any signs of the references in the claims should not be construed as limiting the scope of the claims or inventions.

The fact that some criteria are listed in mutually different dependent claims does not indicate that the combination of these criteria cannot be used profitably.

1. A lighting device (42) containing multiple light-emitting diodes (LED) and a lighting device includes:
first Assembly (43a, 43b, 43c, 43d) LEDs containing at least one led of the first type having a first variable output of luminous flux depending on its transition temperature;
the second Assembly (44a, 44b, 44c, 44d) LEDs containing at least one led of the second type having a second AC output of luminous flux depending on the�transition temperature, different from the first output light flux of the first Assembly (43a, 43b, 43c, 43d) of the LEDs depending on its transition temperature,
the first Assembly (43a, 43b, 43c, 43d) of LEDs connected in series to the second Assembly (44a, 44b, 44c, 44d) of LEDs, and wherein at least one of the LEDs of the first type and the LEDs of the second type connected in parallel to the resistor Assembly 46, 46a, 46b, 48, 48a, 48b) having a temperature-dependent resistance, characterized in that the temperature dependence of the resistance adapts to stabilize, within a predetermined range, the relationship of the first output light flux to the second output of the light flux at different temperatures of the transition of the first Assembly (43a, 43b, 43c, 43d) of LEDs and the second Assembly (44a, 44b, 44c, 44d) of the LEDs.

2. Lighting device according to claim 1, wherein the first output light flux decreases with increase in the transition temperature of the first Assembly (43a, 43b, 43c, 43d) LEDs with the first speed and the second output light flux decreases with increase in the transition temperature of the second Assembly (44a, 44b, 44c, 44d) of LEDs with a second speed below the first speed, the first resistor Assembly (46, 46a, 46b) connected in parallel to at least one first led Assembly 43a, 43b, 43c, 43d) LEDs, and the resistance of the first resistor SRB�Ki (46, 46a, 46b) increases with increasing the temperature of the first resistor Assembly 46, 46a, 46b).

3. Lighting device according to claim 1, wherein the first output light flux decreases with increase in the transition temperature of the first Assembly (43a, 43b, 43c, 43d) LEDs with the first speed and the second output light flux decreases with increase in the transition temperature of the second Assembly (44a, 44b, 44c, 44d) of LEDs with a second speed below the first speed, the second resistor Assembly (48, 48a, 48b) connected in parallel to at least one second led Assembly 44a, 44b, 44c, 44d) LEDs, and the resistance of the second resistor Assembly (48, 48a, 48b) decreases with increase in the temperature of the second resistor Assembly (48, 48a, 48b).

4. Lighting device according to claim 1, wherein the first output light flux decreases with increase in the transition temperature of the first Assembly (43a, 43b, 43c, 43d) LEDs with the first speed and the second output light flux decreases with increase in the transition temperature of the second Assembly (44a, 44b, 44c, 44d) of LEDs with a second speed below the first speed, the first resistor Assembly (46, 46a, 46b) connected in parallel to at least one first led Assembly 43a, 43b, 43c, 43d) LEDs and the second resistor Assembly (48, 48a, 48b) connected in parallel to at least one second led with�orcs (44a, 44b, 44c, 44d) LEDs, the resistance of the first resistor Assembly 46, 46a, 46b) increases with increasing the temperature of the first resistor Assembly 46, 46a, 46b), and the resistance of the second resistor Assembly (48, 48a, 48b) decreases with increase in the temperature of the second resistor Assembly (48, 48a, 48b).

5. Lighting device according to claim 2 or 4, wherein the first resistor Assembly (46, 46a, 46b) contains a resistor with a positive temperature coefficient, PTC.

6. Lighting device according to claim 3 or 4, wherein the second resistor Assembly (48, 48a, 48b) comprises a resistor with a negative temperature coefficient, NTC.

7. Lighting device according to any one of claims.1-4, in which the led of the first type is adapted to generate light having the first color, and wherein the LEDs of the second type adapted to generate light having a second color different from the first color.

8. Lighting device according to any one of claims.1-4, in which the resistor Assembly 46, 46a, 46b, 48, 48a, 48b) and at least one of the LEDs of the first type and the LEDs of the second type, connected in parallel, have a thermal bond.

9. Lighting device according to any one of claims.1-4, in which the transitions of the first Assembly (43a, 43b, 43c, 43d) of LEDs and the second Assembly (44a, 44b, 44c, 44d) LEDs have thermal coupling.

10. Lighting device according to any one of claims.1-4, which led ceiling lamp with LON� first type is an AlInGaP led type.

11. Lighting device according to any one of claims.1-4, in which the led of the second type is the led type InGaN.

12. The method of manufacturing the lighting device containing multiple light-emitting diodes, LED, comprising stages on which:
provide first Assembly (43a, 43b, 43c, 43d) LEDs containing at least one led of the first type having a first variable output of luminous flux depending on its transition temperature;
provide a second Assembly (44a, 44b, 44c, 44d) LEDs containing at least one led of the second type having a second AC output of luminous flux depending on its transition temperature different from that of the first output light flux in the first Assembly (43a, 43b, 43c, 43d) of the LEDs depending on its transition temperature;
connect the first Assembly (43a, 43b, 43c, 43d) LEDs sequentially to the second Assembly (44a, 44b, 44c, 44d) LEDs;
connect at least one of the LEDs of the first type and the LEDs of the second type in parallel to the resistor Assembly 46, 46a, 46b, 48, 48a, 48b) having a temperature-dependent resistance,
characterized in that fit the temperature dependence of resistance for stabilizing, in a predetermined range, the relationship of the first output light flux to the second output of the light flux �ri different transition temperatures of the first Assembly (43a, 43b, 43c, 43d) of LEDs and the second Assembly (44a, 44b, 44c, 44d) of the LEDs.

13. Lighting kit containing:
the dimmer lights with the input conclusions adapted for connection to an electrical power source, and control the brightness of lighting has output terminals adapted to provide alternating current; and
a lighting device (42) according to any one of claims.1-11, wherein the lighting device has terminals (41a, 41b), made with possibility of connection to the output terminals of the dimmer lights.



 

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