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Current-constant driving light modulation circuit of LED of single-stage power supply

A technology of constant current drive and dimming circuit, which is applied in the direction of electric lamp circuit layout, electric light source, light source, etc., can solve the problems of complicated circuit and high cost, large loss of two-stage circuit, and high cost, which is conducive to intelligent control and reduces circuit Loss, the effect of reducing the cost of dimming

Inactive Publication Date: 2015-09-09
阳亮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. Adopt two-stage circuit to drive LED with constant current and support 0-10V analog voltage dimming, the circuit is complex and costly
[0008] 2. The loss of the two-stage circuit is relatively large, the overall efficiency is relatively low, and the temperature rises
Unfavorable products are energy efficient
[0009] 3. The dimming power supply of ordinary secondary feedback power supply has complex circuit structure, high cost, and lower efficiency than primary feedback power supply, which is not conducive to product cost control and energy saving

Method used

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  • Current-constant driving light modulation circuit of LED of single-stage power supply
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  • Current-constant driving light modulation circuit of LED of single-stage power supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Please refer to Figure 4-6 , Embodiment 1 of the present invention is:

[0074] A single-stage power supply LED constant current drive dimming circuit, including a power supply module, a PSR IC power supply control module, a transformer, a control module, an opening and closing control module, a signal conversion module, a PWM transmission module, at least one LED load and external dimming device.

[0075] The power module is connected to one end of the primary coil of the transformer, and the power control module is connected to the other end of the primary coil of the transformer through the MOS transistor Q1; the secondary coil of the transformer is connected to the LED load; The opening and closing control module is connected with the PWM transmission module; the opening and closing control module is connected with the PWM transmission module through a signal conversion module; the signal conversion module and the PWM transmission module are externally connected w...

Embodiment 2

[0076] Please refer to Figure 4-5 , on the basis of embodiment one, embodiment two of the present invention is:

[0077] Such as Figure 5 As shown, the control module includes an output current adjustment circuit, an output voltage control circuit and a VCC power supply circuit;

[0078] The output current adjustment circuit includes resistors R33, R34, R28, R29, R30, R31, capacitors C17, C18, C19 and photoelectric isolator IC5; when the LED circuit is normal and does not dim, the PSR IC power control module controls the output current of the power module, The primary current generated by MOS tube Q1 generates a voltage feedback to the PSR IC power control module through R23. The power control module outputs the corresponding driving waveform from the GATE pin according to the parameters such as the turns ratio of the transformer, so that the LED circuit power supply realizes constant current.

[0079] The output current adjustment circuit receives the PWM signal generated...

Embodiment 3

[0083] Please refer to Figure 4 and 6 , on the basis of embodiment one, embodiment three of the present invention is:

[0084] The secondary control of the LED circuit includes an on-off control module, a signal conversion module and a PWM transmission module; specifically:

[0085] The signal conversion module is preferably a 0-10V to PWM signal module, which is produced by a three-stage operational amplifier circuit, including integrated IC3 (1)-(7) pins, resistors R62, R61, R60, R50, R52, R58, R59, R77, R68, R69, R72, capacitors C52, C50, C53, C51, C54, C56, diode D8, regulator tubes ZD4, ZD5. The first two operational amplifiers form a sawtooth wave generation circuit. The charge and discharge of resistor R62 and capacitor C52 determine the frequency of the sawtooth wave, which is the same as the frequency of the output PWM signal; resistors R60 and R61 determine the amplitude of the sawtooth wave, in order to be compatible with 10V For voltage comparison, the amplitud...

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Abstract

The invention provides a current-constant driving light modulation circuit of an LED of a single-stage power supply. A power supply module and a power supply control module are connected with a primary coil of a transformer, the power supply control module is connected with an on-off control module and a PWM transmission module via a control module, the control module is also connected with the primary coil of the transformer, and the on-off control module is connected with the PWM transmission module via a signal conversion module; the control module receives a switch signal output by the on-off control module and then sends a control signal to the power supply control module, and receives a PWM signal output by the PWM transmission module and then sends a corresponding light modulation signal to the power control module; the signal conversion module converts the input voltage value into the corresponding PWM signal and outputs the PWM signal to the PWM transmission module; and the PWM transmission module amplifies the input PWM signal and transmits the amplified PWM signal to the control module. The circuit efficiency is improved, the light modulation cost is reduced, and energy is saved.

Description

technical field [0001] The invention specifically relates to a single-stage power supply LED constant current drive dimming circuit. Background technique [0002] There are mainly two types of LED dimming power supply circuits in the prior art: [0003] Such as figure 1 , using a common power supply to convert it into a constant DC voltage. The constant DC voltage passes through the step-down or step-up circuit to carry out 0-10V analog voltage or the output current of the PWM control circuit to dim the LED, turn it on, and turn it off; [0004] Such as figure 2 , using a common secondary feedback power supply, adding a dimming control circuit to the secondary feedback circuit. Perform 0-10V analog voltage or PWM control circuit output current to dim the LED, turn it on, and turn it off. [0005] The application document with the patent application number 201210337363.5 also discloses a constant current dimming control device for LED lamps, including a DC power supply,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 阳亮
Owner 阳亮
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