CN113179565B - LED silicon controlled rectifier dimming depth compensation circuit and LED lighting device - Google Patents
LED silicon controlled rectifier dimming depth compensation circuit and LED lighting device Download PDFInfo
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- CN113179565B CN113179565B CN202110490364.2A CN202110490364A CN113179565B CN 113179565 B CN113179565 B CN 113179565B CN 202110490364 A CN202110490364 A CN 202110490364A CN 113179565 B CN113179565 B CN 113179565B
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 13
- 239000010703 silicon Substances 0.000 title claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 230000033228 biological regulation Effects 0.000 claims abstract description 4
- 230000006641 stabilisation Effects 0.000 claims abstract description 4
- 238000011105 stabilization Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
Abstract
The invention provides an LED silicon controlled rectifier dimming depth compensation circuit and an LED lighting device, comprising: voltage input module, stack voltage module, voltage regulation end and voltage stabilization end, wherein: the voltage input module inputs voltage to the superposition voltage module; the voltage of the voltage regulating end is regulated by the superposition voltage module. The invention has reasonable structure, ingenious design and lower cost. By adding the superimposed voltage module, the problem that the output current value of the traditional LED cannot be adjusted to the dimming brightness below 5% is solved.
Description
Technical Field
The invention relates to the field of circuits, in particular to an LED silicon controlled rectifier dimming depth compensation circuit and an LED lighting device.
Background
The existing current splitting mode is to connect a circuit of linear current in parallel at two ends of the LED, and the current flowing through the LED is enabled to reach lower current by the splitting method, so that the deep dimming function is achieved.
In the conventional silicon controlled dimming application, since the reference potential of the output current set by the analog chip is generally set at the level of 10% or 5% at the lowest, the output current value of the LED is generally in the range of 10% -100% or 5% -100%, and cannot meet 1% dimming brightness;
in the combined application of MR16 thyristor dimming and electronic transformer, when some thyristor angles are usually at the lowest, the voltage output by the chopped electronic transformer is still very large, which results in that the output current of the LED still maintains higher output current, i.e. the minimum output current value can reach 20-50%, the requirement that the dimming depth is lower than 10% cannot be met, and the output LED current needs to be reduced to within 10% by adopting a mode.
In summary, the existing dimming circuit cannot realize the deep dimming function.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an LED silicon controlled rectifier dimming depth compensation circuit and an LED lighting device.
The invention provides an LED silicon controlled rectifier dimming depth compensation circuit, which comprises: voltage input module, stack voltage module, voltage regulation end and voltage stabilization end, wherein:
the voltage input module inputs voltage to the superposition voltage module;
the voltage of the voltage regulating end is regulated by the superposition voltage module.
Preferably, the voltage input by the voltage input module is adjusted by the change of the dimming angle of the silicon controlled rectifier or the voltage change of the boosting side.
Preferably, the superimposed voltage module comprises a triode Q2, a collector of the triode Q2 is connected with one end of a resistor R8 and one end of a resistor R10, the other end of the resistor R8 is connected with a voltage regulating end, and the other end of the resistor R10 is connected with a voltage stabilizing end;
the emitter of the triode Q2 is connected with one end of a resistor R9 and one end of a resistor R11, the other end of the resistor R9 is grounded, and the other end of the resistor R11 is connected with a reference voltage.
Preferably, the voltage stabilizing terminal is connected to the other end of the resistor R9 through a capacitor C7.
Preferably, the reference voltage is 5V.
Preferably, the voltage divider circuit divides an input voltage and outputs the divided voltage.
Preferably, the voltage dividing circuit includes a resistor R5 and a resistor R6, wherein:
one end of the resistor R5 is connected with the input voltage, the other end of the resistor R5 is connected with one end of the resistor R6, and the other end of the resistor R6 is grounded;
the divided voltage is output from between the resistor R5 and the resistor R6.
Preferably, the filter circuit further comprises a resistor R7 and a capacitor C6, wherein:
one end of the resistor R7 is connected between the resistor R5 and the resistor R6, the other end of the resistor R7 is connected with the base electrode of the triode Q2 and one end of the capacitor C6, and the other end of the capacitor C6 is grounded.
The LED lighting device comprises the LED silicon controlled rectifier dimming depth compensation circuit.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has reasonable structure, ingenious design and lower cost.
2. According to the invention, the superimposed voltage module is added, so that the problem that the output current value of the traditional LED cannot be adjusted to the dimming brightness below 5% is solved.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
fig. 1 is a schematic diagram of an LED thyristor dimming depth compensation circuit.
Fig. 2 is a schematic circuit diagram of an LED scr dimming depth compensation circuit.
Fig. 3 is a schematic diagram of an application of the LED scr dimming depth compensation circuit.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
As shown in fig. 1 to 3, according to the LED triac dimming depth compensation circuit and the LED lighting device provided by the present invention, by determining a change in a triac dimming angle or a voltage change on a boost side (i.e., a voltage at both ends of an LED becomes smaller as a current becomes smaller), a voltage value is obtained through a certain circuit, and then the voltage value is converted into a current value through the circuit, and finally a voltage value V (r 8) generated through the current value is superimposed on a potential FB set by a chip current, and according to kirchhoff voltage law vfb=vfb1+v (r 8), the magnitude of the potential FB is smaller than the original value due to the addition of V (r 8), so that a desired current depth can be obtained only by properly setting V (r 8). Specifically, a voltage value is obtained by judging the change of the dimming angle of the silicon controlled rectifier or the voltage change of the boosting side, the voltage value is fed back to the detection potential Vfb1 of the set current, and the detection potential Vfb1 is made to be low by superposition or other modes, so that the dimming depth requirement is realized.
According to the circuit schematic diagram of an embodiment of the invention, the circuit can be connected in parallel between the rectifier bridge and the ground by 2 resistors R5 and R6, the two ends of R5 and R6 are connected to a resistor R7, and the R7 is connected with a capacitor C6 and the base electrode of a PNP triode Q2; one end of the resistor R9 and one end of the resistor R11 are connected to the emitter of the triode Q2, the other end of the resistor R9 is grounded, and the other end of the resistor R11 is connected with the reference voltage V5V. The resistor R8 is connected with the resistor R10 and is connected between the FB1 and the FB in parallel, the collector of the triode Q2 is connected between the resistor R8 and the resistor R10, and the capacitor C7 is connected between the FB and the ground in parallel.
The working principle of the invention is as follows: the voltage after the rectifier bridge is divided and filtered to obtain a dynamic voltage value, the base voltage of the PNP triode is controlled, when the voltage Vb is gradually smaller than the voltage Ve, and the Vbe is gradually conducted, the conducting current Ic starts to be generated, the Ic flows through two ends of the resistor R8 to generate the voltage V (R8), and at the moment, the chip sets the voltage Vfb=Vfb1+V (R8) of the output current, namely Iout= [ Vfb-V (R8) ]/R.
When the thyristor angle is smaller, the voltage after the bridge is smaller, whereas when the Vbe conduction angle is larger, the generated V (r 8) is larger, and the output current Iout is smaller.
The invention realizes the depth compensation function of the dimming circuit and can meet the dimming brightness of 1 percent.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (8)
1. An LED thyristor dimming depth compensation circuit, comprising: voltage input module, stack voltage module, voltage regulation end and voltage stabilization end, wherein:
the voltage input module inputs voltage to the superposition voltage module;
the voltage of the voltage regulating end is regulated by the superposition voltage module;
the voltage input by the voltage input module is regulated through the change of the dimming angle of the silicon controlled rectifier or the voltage change of the boosting side;
the voltage dividing circuit divides the input voltage and outputs the divided voltage;
obtaining a voltage value by judging the change of the dimming angle of the silicon controlled rectifier or the voltage at two ends of the LED becomes smaller along with the current decrease, converting the voltage value into a current value through a circuit, and finally superposing a voltage value V (r 8) generated by the current value on a potential FB set by the chip current, and setting V (r 8) to obtain the required current depth; specifically, a voltage value is obtained by judging the change of the dimming angle of the silicon controlled rectifier or the voltage change of the boosting side, the voltage value is fed back to the detection potential Vfb1 of the set current, and the detection potential Vfb1 is lowered in a superposition mode, so that the dimming depth is required to be lower than 5%;
the voltage after the rectifier bridge is divided and filtered to obtain a dynamic voltage value, the base voltage of the PNP triode is controlled, when the voltage Vb is gradually smaller than the voltage Ve, the Vbe is gradually conducted, the conducting current Ic starts to be generated, the Ic flows through two ends of a resistor R8 to generate the voltage V (R8), and at the moment, the chip sets the voltage Vfb=Vfb1+V (R8) of the output current, namely Iout= [ Vfb-V (R8) ]/R;
when the thyristor angle is smaller, the voltage after the bridge is smaller, whereas when the Vbe conduction angle is larger, the generated V (r 8) is larger, and the output current Iout is smaller.
2. The LED scr dimming depth compensation circuit of claim 1, wherein the superimposed voltage module comprises a triode Q2, a collector of the triode Q2 is connected to one end of a resistor R8 and one end of a resistor R10, the other end of the resistor R8 is connected to a voltage regulation terminal, and the other end of the resistor R10 is connected to a voltage stabilization terminal;
the emitter of the triode Q2 is connected with one end of a resistor R9 and one end of a resistor R11, the other end of the resistor R9 is grounded, and the other end of the resistor R11 is connected with a reference voltage.
3. The LED scr dimming depth compensation circuit of claim 2, wherein the voltage stabilizing terminal is connected to the other end of the resistor R9 through a capacitor C7.
4. The LED scr dimming depth compensation circuit of claim 3, wherein the reference voltage is 5V.
5. The LED scr dimming depth compensation circuit of claim 4, wherein the voltage divider circuit comprises a resistor R5 and a resistor R6, wherein:
one end of the resistor R5 is connected with the input voltage, the other end of the resistor R5 is connected with one end of the resistor R6, and the other end of the resistor R6 is grounded;
the divided voltage is output from between the resistor R5 and the resistor R6.
6. The LED scr dimming depth compensation circuit of claim 5, further comprising a filter circuit comprising a resistor R7 and a capacitor C6, wherein:
one end of the resistor R7 is connected between the resistor R5 and the resistor R6, the other end of the resistor R7 is connected with the base electrode of the triode Q2 and one end of the capacitor C6, and the other end of the capacitor C6 is grounded.
7. The LED scr dimming depth compensation circuit of claim 6, wherein the transistor Q2 is a PNP transistor.
8. An LED lighting device comprising an LED thyristor dimming depth compensation circuit according to any one of claims 1 to 7.
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| CN202110490364.2A CN113179565B (en) | 2021-05-06 | 2021-05-06 | LED silicon controlled rectifier dimming depth compensation circuit and LED lighting device |
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| CN202110490364.2A CN113179565B (en) | 2021-05-06 | 2021-05-06 | LED silicon controlled rectifier dimming depth compensation circuit and LED lighting device |
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| CN113179565B true CN113179565B (en) | 2024-01-12 |
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