LED driving power supply

A technology of LED drive and power supply, which is applied in the direction of electric light source, electroluminescent light source, light source, etc. It can solve the problems of low power supply efficiency of the resistance-capacitance step-down scheme and the influence of grid voltage fluctuations, etc., so as to improve the service life, stabilize the current, and output The effect of small ripple

Pending Publication Date: 2019-07-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the power supply efficiency of the resistance-capacitance step-down scheme is low, reaching a maximum of 60%, and it is easily affected when the grid voltage fluctuates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] See attached figure 1 , Embodiment 1 of the present invention discloses an LED drive power supply, including: a rectifier circuit 1, a first filter circuit 2, an isolation transformer 3, a controller 4, a second filter circuit 5, a sampling feedback circuit 6, and a pulse width modulator 7 and toggle switch 8;

[0036] The output end of the rectification circuit 1 is connected to the first filter circuit 2, the isolation transformer 3, the controller 4, and the second filter circuit 5 in sequence;

[0037] One end of the sampling feedback circuit 6 is connected to the second filter circuit, and the other end is connected to the pulse width modulator 7;

[0038] The pulse width modulator 7 is connected to the switch 8;

[0039] The changeover switch 8 is connected with the isolation transformer 3 .

[0040] The rectifier circuit is used to change the alternating current with positive and negative changes into direct current with one-way change;

[0041] The first fil...

Embodiment 2

[0048] See attached figure 2 , Embodiment 2 of the present invention discloses an LED drive power supply, including: a rectifier circuit 1, a first filter circuit 2, an isolation transformer 3, a controller 4, a second filter circuit 5, a sampling feedback circuit 6, and a pulse width modulator 7 , switch 8 and overvoltage protection unit 9;

[0049] The output end of the rectification circuit 1 is connected to the first filter circuit 2, the isolation transformer 3, the controller 4, and the second filter circuit 5 in sequence;

[0050] One end of the sampling feedback circuit 6 is connected to the second filter circuit, and the other end is connected to the pulse width modulator 7;

[0051] The pulse width modulator 7 is connected to the switch 8;

[0052] The changeover switch 8 is connected with the isolation transformer 3 .

[0053] One end of the overvoltage protection unit 9 is connected to the alternating current, and the other end is connected to the rectifier cir...

Embodiment 3

[0056] See attached image 3 , Embodiment 3 of the present invention discloses an LED drive power supply, including: a rectifier circuit 1, a first filter circuit 2, an isolation transformer 3, a controller 4, a second filter circuit 5, a sampling feedback circuit 6, and a pulse width modulator 7 , switch 8, anti-surge protection circuit 10, anti-leakage protection circuit 11 and overcurrent protection circuit 12;

[0057] The anti-surge protection circuit 10 , the anti-leakage protection circuit 11 and the overcurrent protection circuit 12 are all connected to the controller 4 . For the connection relationship of other components, please refer to Embodiment 1.

[0058]The LED driving power provided by the present invention adds multiple protection circuits at the same time, has multiple protection functions, integrates multiple protection integrated circuits and corresponding components, solves the current ubiquitous problems of dim light and weak anti-surge ability, and can ...

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Abstract

The invention discloses an LED driving power supply. The LED driving power supply includes a rectifier circuit, a first filter circuit, an isolation transformer, a controller, a second filter circuit,a sampling feedback circuit, a pulse width modulator and a switching switch, wherein an output end of the rectifier circuit is sequentially connected with the first filter circuit, the isolation transformer, the controller and the second filter circuit, one end of the sampling feedback circuit is connected with the second filter circuit, the other end is connected with the pulse width modulator,the pulse width modulator and the switching switch are connected, and the switching switch is connected with the isolation transformer. The LED driving power supply is advantaged in that output is stable, power supply efficiency is high, and the power supply efficiency can reach 80-90%.

Description

technical field [0001] The present invention relates to the technical field of driving power supply, and more specifically relates to an LED driving power supply. Background technique [0002] The initial commercial application of LEDs appeared in the 1970s. In the early stages of development, the scope of application was limited to areas such as indicator lights and calculator display screens. With the continuous development of LED technology, LED lighting is becoming more and more popular, and the trend of LED bulbs replacing conventional bulbs with filaments is becoming more and more obvious. Correspondingly, the demand for driving power suitable for LED bulbs is also increasing. [0003] The LED drive power supply is a power converter that converts the power supply into a specific voltage and current to drive the LED to emit light. At present, LED driving power supplies on the market are mainly divided into RC resistance-capacitance schemes and switching power supply s...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00H05B45/50Y02B20/30
Inventor 夏百战石世光骆浩
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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