Light source with regulated luminous power and colour temperature shift

FIELD: electricity.

SUBSTANCE: invention relates to lighting engineering. Lighting installation (1) comprises input pins (2) for connection to alternating current (AC) network; a circuit (10) of light-emitting diodes (LED) connected in series with input pins; rectifier (30) with input pins (31, 32) connected in series with LED circuit, controllable voltage source (40) with input pins coupled to output pins of the rectifier; in-series assembly of at least one auxiliary LED (51) and the second ballast resistor (52) coupled to output pins of the controllable voltage source. Voltage source comprises in-series assembly of the fist controllable resistor (46) and the second resistor (47) coupled in parallel to input pins; controllable semiconductor stabilitron connected in parallel to output pins, which has input pin (48) connected at connection point between two resistors; at that positive output pin is connected to positive input pin while negative output pin is connected to negative input pin.

EFFECT: simplified regulation of the device in regard to luminous power and luminous efficiency shift to lower colour temperature.

7 cl, 2 dwg

 

AREA of TECHNOLOGY

The present invention relates to a lighting device containing light-emitting diodes (LED) as light sources.

PRIOR art

The use of LED as light sources for illumination, and not just as the lights, well known, starting with the development of high power LED. Also is almost standard that the lighting device receives power from the network, in Europe, generally, a voltage of 230 V and frequency 50 Hz. Since LED's require a relatively low voltage (typically about 3) and allow the flow of electric current in one direction only, were developed by the control circuit to generate a direct current light emitting diode (DC LED current) based on a network of an alternating current (AC). However, such control circuits are relatively expensive.

In a simpler approach, the chain LED connects to the network directly, in series with a ballast resistor. To obtain the LED current and thus the light output in both halves of the period of the AC two such chains are connected anti-parallel. The idea would be that, for example, 70 LED would provide a voltage drop 210, while the remaining 20 would be provided In the ballast resistor. Voltage change would be compensated ballast resistor�M.

Although the simplicity of this approach and therefore relatively cost-effective its implementation will have a certain charm as well, there is a problem when it is desirable that the lighting device was adjustable light intensity.

For some applications it is desirable that the lighting device was not only adjustable light intensity, and color temperature light output is shifted to a lower value when adjusting the light intensity. This requirement is especially important in the case of small bedside lamps or table lamps, but there may be other applications where it would be desirable this feature.

SUMMARY the essence of the INVENTION

The object of the present invention is to provide a simple and cost-effective lighting device containing multiple LED as light source, made with the possibility of regulation of intensity by a simple method while shifting the light output of the device to automatically lower color temperature.

According to an important aspect of the present invention, the configurable voltage source is connected in series with at least one white LED, and the voltage source supplies at least one red LED. When the output power of the voltage source increases, the incidence�their voltage on the voltage source increases, white LED to get less power, while the red LED gets more power.

Additional preferred embodiments of the invention are presented in dependent clauses.

BRIEF description of the DRAWINGS

The invention is further explained by description of preferred embodiments with reference to the accompanying drawings, in which:

Fig.1 schematically depicts a block diagram of the lighting device;

Fig.2 schematically shows a block diagram of a voltage source for use in the lighting device of Fig.1.

DETAILED description of the INVENTION

Fig.1 schematically depicts a block diagram of a lighting device 1 according to the present invention. The lighting device 1 contains the input pins 2 to connect to AC power. Chain 10 LED connected in series with the input pins 2. Chain 10 LED comprises a first sequence of the main high-power LED 11 and the second sequence of the main high-power LED 12 that is connected anti-parallel to the first sequence. The first ballast resistor 13 is connected in series with the chain 10 LED.

Basic LED 11, 12 are preferably white LEDs. However, it is also possible that one or more of these LEDs are colored LED.

The rectifier 30 has its input findings 31, 32, mounted in series with TSE�of accoi 10 LED. The rectifier 30 may include a bridge circuit of diodes, as is well known.

At its output pins 33, 34 of rectifier 30 provides a rectified voltage V1 of the DC. If required, this voltage can be smoothed by a capacitor parallel to the output terminals 33, 34, but it is not shown for simplicity.

The lighting device 1 further comprises a controllable source 40 voltage having input terminals 41, 42 connected to the outputs 33, 34 of the rectifier to receive the rectified voltage V1 of the DC input voltage. Reference position 45 means controlled by a user control input. On its output pins 43, 44 controlled source 40 provides voltage output voltage V2 of the constant current whose magnitude depends on the input signal received at the input 45 of the user control. Serial connection of at least one auxiliary LED 51 and the second ballast resistor 52 is connected with the outputs 43, 44 of the controlled source 40 voltage.

Usually, only one auxiliary LED 51 will be sufficient, but the idea of the present invention is also applicable if two or more auxiliary LED connected in series.

Preferably, auxiliary LED 51 is red mo�tion LED. However, the idea of the present invention is also applicable if the color of the auxiliary LED 51 has a lower color temperature than the color of the main high-power LED 11, 12. For example, would be a possible variant implementation, where the main high-power LED 11, 12 are white LED, while auxiliary LED 51 is orange or yellow LED. Additionally, in the case of multiple auxiliary LED is not essential that all auxiliary LED jointly have the same color.

It should be noted that instead of a managed source 40 voltage can be used a controlled current source.

It should be further noted that instead of the controlled voltage source (or current) DC can be used controlled voltage source (or current) of an alternating current. In this case, the rectifier 30 may be omitted, and the auxiliary LED may contain at least two LEDs mounted anti-parallel.

Basic LED 11, 12 and auxiliary(e) of the LED 51 is mounted close to each other in the lighting device 1, so that the total output light generated by the lighting device 1 as a whole, as perceived by the user, is a mixture of separate light outputs of the individual LED 11, 12, 51.

The current produced by the network and received by the chain 10 LED, will be designated as Imains. This current is also taken as an input current of the rectifier� 30. It is assumed that the loss of current in the rectifier 30 are missing. Rectified current network (the output current of the rectifier 30, which will be denoted as <Imains>, is provided as the input current source 40 strain. Part of the rectified current network will be consumed a controlled source 40 strain: this current will be denoted as ballast I1. The current generated at the output of the source 40 voltage and accepted auxiliary LED 51 will be designated as auxiliary current I2. Thus, it should be clear that <Imains>=I1+I2.

The work is carried out as follows. Assume that the user has installed a managed source 40 of direct current voltage to low output voltage, so that the auxiliary LED 51 does not create light or only generates a small amount of light. Then, the voltage drop across the input terminals 41, 42 of the source 40 a relatively low voltage, and therefore the voltage drop across the input pins 31, 32 of the rectifier 30 is low, thus, the chain 10 LED takes the maximum excitation voltage and creates maximum light output.

Assume that the user adjusts a manipulated source 40 DC voltage to a higher output voltage. As a consequence, auxiliary LED 51 produces an increased amount of light. Simultaneously, the voltage drop� on the input pins 41, 42 source 40 voltage increases, and therefore the voltage drop across the input pins 31, 32 of the rectifier 30 is increased, the excitation voltage for the chain 10 LED is reduced and the amount of light generated by the chain 10 LED decreases. Overall, the level of light output of the lighting device is reduced (adjustable for dimming), while the relative content of red light in the light output increases (shift to a lower color temperature).

Fig.2 shows a block diagram of an embodiment of source 40 voltage, which is preferred because of its simplicity. Adjustable semiconductor Zener diode 49 (for example, standard TL431 component or LM431, commercially available from, for example, Motorola, Texas Instruments, Fairchild Semiconductor) is connected in parallel with the outputs 43, 44. The serial arrangement of the first resistor 46 and a second resistor 47 connected in parallel with the input terminals 41, 42. The connection point between the two resistors 46, 47 is connected with a control input output 48 to the controlled semiconductor Zener diode 49. Positive output output 43 is connected to the positive input of the output 41, and a negative output pin 44 is connected to the negative input output 42. One of the resistors 46, 47 is an adjustable resistor and implements �the course of 45 user management; in a variant implementation, as shown, it refers to the first resistor 46 which is connected to the positive input of the output 41.

For the circuit in Fig.2, the output voltage V2 satisfies the formula V2=(1+R1/R2)·Vref,

wherein R1 is the resistance value of the first resistor 46;

R2 is the resistance value of the second resistor 47;

Vref - internal reference voltage controlled semiconductor Zener diode 49, in a typical case, approximately 1.2 V or 2.5 V.

It should be noted that in this scheme V1=V2.

If R1=0, then the output voltage V2 is equal to Vref, too low for auxiliary LED 51 to conduct current (depending on the properties of the auxiliary LED 51 and the second ballast resistor 52). Since the input voltage V1 will also be equal to Vref, the chain 10 LED takes almost full line voltage. The resulting large main current of <Imains> will flow mainly through the semiconductor Zener diode 49 and partially through the second resistor 47.

If R1 increases, the output voltage V2 will increase, so that the auxiliary LED 51 can conduct more current I2 (the exact value of the auxiliary current I2 will depend on the properties of the auxiliary LED 51 and the second ballast resistor 52). Since the input voltage V1 also increases, the chain 10 LED gets less voltage and so�m, will hold less of the main current Imain. The difference I1=<Imains>-I2 will flow mainly through the semiconductor Zener diode 49, designated as Iz, and partially through the first and second resistors 46, 47. As should be clear for the person skilled in the art, the proper choice of components, especially of the first and second ballast resistors 13, 52, and direct voltage LED 11, 12, 51, in conjunction with the number of LEDs and their light output, will lead to the desired offset color when adjusting the brightness.

In summary, the present invention provides a lighting device 1, containing:

- input pin 2 for connection with the alternating current;

- the chain 10 LED connected in series with the input pins;

- the rectifier 30 having input the findings of which are connected in series with chain LED;

- managed source 40 voltage having input on the findings related to the output terminals of the rectifier;

- incremental linking at least one auxiliary LED 51 and the second ballast resistor 52 connected to the output terminals of the control voltage source.

The voltage source contains:

serial arrangement of an adjustable first resistor 46 and a second resistor 47 connected in parallel with the input pins;

adjustable semiconductor stability�n 49, connected in parallel with outputs having managing input output 48 connected to a connection point between the two resistors.

Positive output pin is connected to the positive input of the output and the negative output pin is connected to the negative input to the output.

While the invention has been illustrated and described in detail in the drawings and in the foregoing description, the specialist in the art should be understood that such illustration and description should be considered illustrative or exemplary, but not restrictive. The invention is not limited to the disclosed variants of implementation; on the contrary, various changes and modifications are possible within the scope of protection of the invention as defined in the appended claims. For example, the first ballast resistor 13 can be moved to the rectifier 30 or 40.

Additionally, the chain 10 LED may have a configuration different from the configuration shown in Fig.1. For example, the chain LED may be implemented as a sequential arrangement of LED blocks, each LED unit comprises at least one first LED connected in anti-parallel with at least one second LED. Other multilink configurations are also possible.

Other variations of the disclosed variants implemented�I can be clear to experts in the art and implemented in the practical implementation of the claimed invention on the basis of studying of drawings, disclosure and the appended claims. In the claims the word "contains" does not exclude other elements or steps, and the use of the singular does not exclude the plural. A single processor or other unit may fulfill the functions of several units mentioned in the claims. The fact that certain evidence cited in mutually different dependent clauses, does not mean that the combination of these features cannot be used advantageously. The computer program may be stored/distributed on a suitable medium such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, for example, through the Internet or other wired or wireless telecommunication systems. Any reference positions in the claims should not be construed as limiting the scope.

1. Lighting device, comprising:
input the conclusions of the lighting device for connection with the alternating current (AC);
chain of light-emitting diodes (LEDs) connected in series with the input pins of the lighting device;
a rectifier having input the findings of which are connected in series with the chain and LED input pins of the device about�illumination, and having output terminals;
a controllable voltage source having an input conclusions connected with the output terminals of the rectifier, and having output terminals;
incremental linking at least one auxiliary LED and auxiliary ballast resistor connected in parallel with the output terminals of the control voltage source,
moreover, the correlated color temperature of output light of the auxiliary LED is lower than the correlated color temperature of output light chain LED.

2. The lighting device according to claim 1, further comprising a first ballast resistor connected in series with the chain LED to the input terminals of the rectifier.

3. The lighting device according to claim 1, wherein at least some of the LED in a sequential chain are LED white LED.

4. The lighting device according to claim 1, wherein the auxiliary LED contains a red LED.

5. The lighting device according to claim 1, wherein the output terminals of the rectifier includes a positive output and negative output output pin and the input terminals of the control voltage source includes a positive input pin and a negative input pin, and a controllable voltage source includes:
serial arrangement of a first resistor and a second resistor connected in parallel�individual input pins of the voltage source;
adjustable semiconductor Zener diode connected in parallel with outputs of the voltage source, and adjustable semiconductor Zener diode is managing input pin connected to the connection point between the two resistors;
the positive output pin of the rectifier is connected to the positive input of the output of the controlled voltage source and the negative output pin of the rectifier is connected to the negative input the output of the controlled voltage source;
and one of the first and second resistors (46, 47) is an adjustable resistor.

6. The lighting device according to claim 5, in which the first resistor is connected between the positive input of the output and control input adjustable output semiconductor Zener diode, an adjustable resistor.

7. The lighting device according to claim 1, wherein the chain contains LED anti-parallel arrangement of the first sequence of the main high-power LED and the second sequence of the main powerful LED (12) connected anti-parallel to the first sequence.



 

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