Led light source and lamp comprising led light source

FIELD: electricity.

SUBSTANCE: invention relates to lighting engineering. A LED light source comprises: the first rectifier having the first and the second input terminals to connect to the alternating voltage source and the first and the second output terminals connected by the first LED circuit, the second rectifier having the first and the second input terminals and output terminals; the first input terminal of the second rectifier is connected to the first input terminal of the first rectifier and the second input terminal of the second rectifier is connected to the second input terminal of the first rectifier, the output terminals are connected by the second LED circuit, it also comprises a unit to create phase shift between the voltages which are present at the output terminals of the first rectifier and the output terminals of the second rectifier respectively in the course of operation. The LED circuits are excited by the circuit that can be powered from electricity supply network.

EFFECT: possibility to suppress stroboscopic effects.

6 cl, 7 dwg

 

The technical field to which the invention relates

The present invention relates to an led light source, which can be powered from the network, and the lamp containing an led light source.

Prior art

Very cheap way to supply current to the led string is connected led string to the output terminals of the rectifier. During the operation of the input terminals of the rectifier connected to the mains and output terminals of the rectified mains voltage is applied to the led string, making through the led string current is flowing.

The invention

In the immediate vicinity of zero values in the mains voltage and the voltage across the led chain is too little to cause the current flowing through the led string. As a result the current through the led string is terminated with a frequency equal to twice the network frequency. In light of resting objects flicker is not perceived, but the lighting of moving objects appear stroboscopic defects.

These strobe defects can largely be suppressed in the case of led light source, which contains two led chains, and between the currents in the first led string and in the second the second led chain is provided with a phase shift. Such a phase shift may be provided by connecting each of the led chains to the output terminals of the individual rectifier. The first rectifier, for example, connected to the mains directly or through components that does not produce a phase shift, and a second rectifier, for example, connected to the network via a reactive component that generates a phase shift of, for example, a capacitive element or an inductive element. Output terminals of the first rectifier is connected to the first led chain, and output terminals of the second rectifier connected to the second led chain. When the current through one of the led chains is equal to zero, the current through the second led string, due to phase shift is not equal to zero. In the stroboscopic defects largely suppressed. Preferably the phase shift between the current through the first led string and the current through the second led string is equal to about 90 degrees.

To suppress strobe defects can also in the case where the led light source has three or more led strings and the current through the led chain is shifted in phase by 180/n degrees, where n is the number of led chains. To ensure this phase shift led light source must contain at least the third wypr metal and the second reactive element.

The duty cycle of the current through the led string (i.e. the ratio of time during which the led chain conducts current, and the half-period of the mains) increases with the decrease of the voltage drop across the led chain. A portion of the LEDs contained in the led chain can be connected in parallel. When the voltage drop across the led chain, fed by a reactive current that is smaller than the voltage drop across another led chain, the phase shift between the currents through the led chain is increased.

The above-described light source is very suitable for use in the led lamp, containing the lamp housing, the electrical contacts for connection to a power source, heat sink, which is at least partially located in the lamp housing, and the space enclosed in the lamp housing, is divided into several cells, each of which is at least partly limited by the wall of the lamp housing and the heat sink. LEDs contained in each of the led chains led light source connected to the heat sink and distributed over at least part of the cells.

In a preferred embodiment, the led lamp includes a lamp base, the lamp bulb connected to the lamp cap and is divided into two or more parts, heat sink, location the config between the bulb and dividing the space in the lamp on the cell, the number of which is equal to the number of parts of the lamp bulb, the LEDs contained in each of the led chains connected to the heat sink and evenly distributed across the cells.

Brief description of drawings

Embodiments of the invention are described in more detail below with reference to the drawings, in which:

Fig. 1 depicts an implementation option of the led light source in accordance with the invention, the distribution of the LEDs contained in the led chains, on cells of the led lamp according to a variant embodiment of the invention;

Fig. 2 depicts an implementation option led lamp in accordance with the invention;

Fig. 3-6 depict the distribution of the LEDs contained in the led chains led light source according to a variant embodiment of the invention, the cells contained in the led lamp according to a variant embodiment of the invention.

Detailed description of embodiments of the invention

In Fig. 1 K1 and K2 are input terminals for connection to the mains. Input terminal K1 is connected through an ohmic resistor R1 to the first input terminal of the rectifying bridge Rect1 as well as through the ohmic resistor R2 and the capacitor C to the first input terminal of the second rectifier bridge Rect2. The capacitor C forms react wny element. Input terminal K2 is connected to the second input terminal of the first rectifier bridge Rect1 and the second input terminal of the second rectifier bridge Rect2. The first output terminal of the first rectifier bridge Rect1 connected to the first end of the led string LS1. The second end of the led string LS1 is connected to the second output terminal of the first rectifier Rect1. The first output terminal of the second rectifier Rect2 connected to the first end of the second led string LS2. The second end of the second led string LS2 is connected to the second output terminal of the second rectifier bridge Rect2. In Fig. 1 Comp1 and Comp2 schematically represent, respectively, the first cell and the second cell contained in the led lamp according to a variant embodiment of the invention. LED each of the led chains LS1 and LS2 are distributed on the first cell Comp1 and the second cell Comp2 so that part of the LED of each led string is present in the first cell Comp1 and the rest of the LED of each led string is present in the second cell Comp2.

The led light source shown in Fig. 1, operates as follows.

When the input terminals K1 and K2 are connected to the poles of the power supply, the first low-frequency sinusoidal AC voltage coming from the power supply is present at the input terminals of the x of the first rectifier bridge Rect1 and straightens up in the first periodic voltage DC which is present between the output terminals of the first rectifier bridge Rect1 and, thus, on the first led chain LS1. The second low-frequency sinusoidal AC voltage is present at input terminal of the second rectifier bridge Rect1 and straightens the second periodic DC voltage that is present between the output terminals of the second rectifier bridge Rect2 and, thus, the second led chain LS2. The second sinusoidal AC voltage supplied from the power supply through the capacitor C and for this reason are shifted in phase relative to the first sinusoidal AC voltage. In the second periodic DC voltage also is shifted in phase relative to the first periodic voltage DC. When the instantaneous amplitude of the first periodic DC voltage is too low to cause the current flowing through the first led string LS1, due to a phase shift of the instantaneous value of the second periodic DC voltage is large enough to cause the current flowing through the second led string LS2. Consequently, at any point in time, one of the led chains always conduct current and, thus, the generation who operates the light. Because the LED of each led string is distributed on cells of the Comp1 and Comp2, at any moment of time the light is generated in each cell. This allows to suppress stroboscopic effects.

In Fig. 2 shows a led lamp, which has the form of an incandescent lamp. The lamp has a bulb socket 1 lamp and the casing or flask 2/3 of the lamp, which is divided into two parts 2 and 3. Between the two parts of the present heat sink 4, which divides the space within the lamp bulb on the two cells. Led lamp includes an led light source shown in Fig. 1. In each cell half the LEDs belonging to each of two different led chains present on the heat sink. Two different led string is connected to the mains, as shown in Fig. 1. Since the first half of the LEDs in each chain is in the first cell, and the other in the second cell, the amount of light generated in both cells, always the same. In the socket of the lamp there are two rectifier, two resistors and a capacitor.

Of course, you can choose the lamp housing, the shape of which differs from the shape of the incandescent lamp. You can also divide the space within the lamp housing of three or more cells that are at least partially limited by the heat sink and the wall of the lamp housing. The lamp may be provided with electric contacts ex is evidence from the contacts of the lamp base or the lamp holder. Depending on the practical application of the lamp may be desirable that the light output of each cell that contains an LED, was almost identical. In this case, it is necessary that the LED contained in two or more led chains are uniformly distributed over at least part of the cells. In some applications, it may be desirable that different cells have different light output. This can be achieved by unevenly distributing the LED contained in two or more led chains on at least part of the cells.

In Fig. 3B schematically shows the distribution of the three led chains in three cells of the led lamp. On each of the led chains served periodic DC voltage. These periodic DC voltage generated by the circuit shown in Fig. 3A, containing three rectifier Rect1, Rect2 and Rect3 and two reactive element C1 and C2 in the form of two capacitors. These three periodic DC voltage present between the output terminals K3-K8 three respective rectifiers. Each of these periodic DC voltages are shifted in phase relative to the other two periodic DC voltages. The first led chain LS1 is connected between the output terminals K3 and K4 rectifier Rect1. Second svetodiody the chain LS2 is connected between the output terminals K5 and K6 rectifier Rect2. The third led chain LS3 is connected between the output terminals K7 and K8 rectifier Rect3. Each of the led chains LS1, LS2 and LS3 are distributed across two of the three cells Comp1, Comp2 and " Comp3", because the first part of LED is present in the cell, and the remaining LEDs are present in another cell. All cells contain the same number of LEDs and therefore have the same light output during operation of the led lamp. Lamp with three cells usually have more good feature of the Omni-directional distribution of the generated light. The use of three shifted in phase of the currents through the three corresponding led string, in General, provides a light intensity which is less than the change over time than in the case where light is generated only two led chains.

In Fig. 4 also schematically shows the distribution of the three led chains in three cells of the led lamp. Led chains are powered from the circuit shown in Fig. 3A. Each of the led chains are unevenly distributed across three cells, because each led chain contains 8 LEDs, the first three of which are contained in the first cell, the second three in the second cell and the remaining two in the third cell. Each of the three cells contains the same number of LEDs, so that the total number of LEDs, the soda is held in three led chains, uniformly distributed on the three cells.

In Fig. 5 schematically shows the distribution of the two led chains in two cells led lamp. Similarly to Fig. 1, each led chain is served periodic DC voltage. Two periodic DC voltage shifted in phase relative to each other. Each led chain part of the LED is present in the first cell and the rest are present in the second cell. Of the total number of LEDs contained in two chains, the first cell has more LEDs than in the second cell. In the light output of the first cell during operation is larger than the second cell. However, since each cell contains LEDs that belong to both the led chains, stroboscopic defects largely suppressed. Light generated in the first cell can be, for example, be used for the light table, and the light generated in the second cell, can be used to illuminate the environment of the table.

In Fig. 6 shows two led chains, distributed on two cells. Two led chains are powered, as shown in Fig. 1 or Fig. 5. At least part of the LED contained in the second chain connected in parallel. When this second chain is connected to the output terminals of ViPr is mites, it is shown in Fig. 1, which has a capacitor connected to its input terminal, and the other chain is connected to the output terminals of the other rectifier, duty cycle capacitive current increases as the voltage drop across the first chain is lower than in the case when all LEDs are connected in series. As a result, the voltage on the capacitor increases, and therefore the phase shift between the currents flowing through the two chains also increases.

1. Led light source that contains
the first rectifier having first and second input terminals for connection to a source of AC voltage and first and second output terminals and the first led string connected between the first output terminal and second output terminal,
a second rectifier having first and second input terminals and output terminals, the first input terminal of the second rectifier connected to the first input terminal of the first rectifier and the second input terminal of the second rectifier connected to the second input terminal of the first rectifier and the second led chain is connected between the output terminals of the second rectifier, and
the means for forming a phase shift between voltage, which is present during operation on the output terminals of the first rectifier, and the voltage to which e is present at the output terminals of the second rectifier.

2. The led light source according to claim 1 in which the means for forming a phase shift contains a reactive element connected between the first input terminal of the second rectifier and the first input terminal of the first rectifier.

3. The led light source according to claim 2, containing at least one additional rectifier having first and second input terminals and output terminals, the first input terminal of the additional rectifier is connected to the first input terminal of the first rectifier through additional reactive element, and the second input terminal of the additional rectifier connected to the second input terminal of the first rectifier, and an additional led chain is connected between the output terminals of the additional rectifier.

4. The led light source according to claim 1, in which at least part of the LEDs in the second led chain, connected in parallel.

5. Led lamp, containing
the lamp housing,
electrical contacts,
the heat sink is at least partially located in the housing of the lamp,
moreover, the area enclosed by the lamp housing, is divided into several cells, each of which is at least partially limited by the wall of the lamp housing and the heat sink,
the led light source according to claim 1 or 2,
with modity, contained in each of the led chains connected to the heat sink and distributed over at least part of the cells.

6. Led lamp, containing
the lamp cap,
the bulb is connected to the lamp cap and is divided into two or more parts,
the heat sink is located between the bulb and dividing the space in the lamp on the cell, the number of which is equal to the number of parts of the lamp bulb,
the led light source according to claim 1 or 2,
thus, at least part of the LEDs in the second led chain, connected in parallel, and
the LEDs contained in each of the led chains connected to the heat sink and evenly distributed across the cells.



 

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