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A single-stage multi-output LED power supply constant current drive circuit

A technology of LED power supply and multiple output, which is applied in the layout of electric lamp circuit, electric light source, light source, etc., can solve the problems of high cost, low overall benefit, temperature rise, etc., to improve efficiency, simplify LED power drive circuit, and reduce cost Effect

Inactive Publication Date: 2017-07-25
东莞市威迩丽特电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent solves the problem of poor reliability caused by too many LED lamps connected in series, it still cannot automatically adjust the current output according to the number of connected LEDs, and does not support the analog voltage dimming function.
[0006] The above-mentioned traditional multi-output LED drive power supply uses two-stage circuits to realize constant current driving of the LED power supply circuit. The circuit is complex, the cost is high, the loss of the two-stage circuit is large, the overall benefit is low, and the temperature rises. Requirements for high-efficiency and energy-saving products

Method used

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  • A single-stage multi-output LED power supply constant current drive circuit
  • A single-stage multi-output LED power supply constant current drive circuit
  • A single-stage multi-output LED power supply constant current drive circuit

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Experimental program
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Effect test

Embodiment 1

[0087] Please refer to Figure 4 , 5 And 8, embodiment one of the present invention is:

[0088] A primary-side feedback single-stage multi-output LED power supply constant current drive circuit, including a power supply module, a power supply control module, a transformer, a primary-side control module, a PWM signal generation module, an output detection module, and at least two LED load access channels ;

[0089] The output detection module includes an output detection circuit and a VCC power supply circuit connected in sequence;

[0090] The PWM signal generation module includes a dimmer access terminal, an analog voltage generation circuit, a 0-10V conversion PWM circuit and a PWM transmission circuit connected in sequence;

[0091] The primary side control module includes an output current adjustment circuit and an output voltage control circuit connected to each other;

[0092] The power supply module and the power control module are respectively connected to the prima...

Embodiment 2

[0094] Please refer to Figure 5 and 8 , on the basis of embodiment one, embodiment two of the present invention is:

[0095] The output detection module includes an output detection circuit and a VCC power supply circuit connected in sequence; specifically:

[0096] Described output detection circuit comprises resistance R46, R63, R71, R45, R47, R36, electric capacity C27, C21, C20, C24, C22 and photoelectric isolator IC7; Concrete working principle is as follows:

[0097] When the LED light string is connected to the LED load and connected to the channel LED1+, LED1-, there will be a current through R36, and R36 will generate a voltage through R46 to the third pin IN+ and the second pin of the op-amp of the photoelectric isolator IC7. The set detection reference voltage is compared, and a low level is output after the comparison, telling the PWM signal generation module that the first LED load access channel is connected to the LED light. Resistor R63 plays a role in acce...

Embodiment 3

[0112] Please refer to Figure 5 and 8 , on the basis of embodiment one, embodiment three of the present invention is:

[0113] The PWM signal generating module also includes an opening and closing control module, and the opening and closing control module is respectively connected to the primary side control module and the PWM signal generating circuit of the 0-10V conversion PWM circuit;

[0114] The opening and closing control module includes resistors R67, R66, R70, R64, R65, R78, R73, R76, R47, R63, photoelectric isolator IC4, capacitor C55 and transistor Q8. R64, R65, R78 and IC4 form the reference 1.0V; the switching voltage signal is taken from the input "+" terminal of the third-stage operational amplifier circuit, that is, the IN3+ pin of integrated IC3, and the voltage is compared with the reference 1.0V after passing through R67, R66 and R70 , when it is lower than 1.0V, the third-stage circuit outputs a low level, drives the triode Q8 to conduct through R76 and ...

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Abstract

The present invention provides a single-stage multi-channel output LED power constant current drive circuit, comprising a power supply module, a power supply control module, a transformer, a constant current and constant voltage control module, a signal generation module, an output detection module and at least two LED load connections channel; the constant current and constant voltage control module is respectively connected with the power supply control module, the secondary coil of the transformer and the signal generation module; the signal generation module is connected with the LED load access channel through the output detection module; the output detection module detects that an LED load is connected When the channel has current output, it sends a signal; the signal generation module determines the number of channels connected to the LED light; and outputs the corresponding analog voltage according to the number of channels; the constant current and constant voltage control module outputs the corresponding control signal; the power control module according to the control signal Control the power module to adjust the magnitude of the output current. The invention realizes single-stage circuit driving, and one power supply drives multiple LED lamps, thereby improving the efficiency of the power supply circuit.

Description

technical field [0001] The invention relates to the field of LED circuits, in particular to a single-stage multi-channel output LED power supply constant current drive circuit. Background technique [0002] There are two types of existing multi-output LED drive power supplies: [0003] Such as figure 1 As shown, an ordinary secondary constant current LED power supply is used to convert it into a constant DC voltage; the constant DC voltage is output through a step-down or boost circuit again to drive multiple LEDs; [0004] Such as figure 2 As shown, the common primary side constant current LED power supply is converted into a constant DC voltage. The constant DC voltage is output through the step-down or step-up circuit again to drive multiple LEDs; [0005] Patent Application No. 201410499908.1 "A Multi-output High Step-Down LED Constant Current Drive Power Supply" discloses a LED drive including two parts, a PFC rectifier circuit and a DC / DC step-down constant curren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 阳亮
Owner 东莞市威迩丽特电子科技有限公司
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