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High pf low thd led drive switching power supply circuit

A switching power supply circuit, LED driving technology, applied in electrical components and other directions, can solve the problems of high circuit design cost, low PF value, high THD, etc., and achieve the effect of saving circuit design cost, improving PF, and simplifying circuit structure

Active Publication Date: 2022-05-10
东莞市德磬电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing LED drive switching power supply circuits generally have problems such as low PF value, high THD and complex structure, resulting in high circuit design costs
Also, the PF value of the existing LED drive switching power supply circuit

Method used

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  • High pf low thd led drive switching power supply circuit
  • High pf low thd led drive switching power supply circuit
  • High pf low thd led drive switching power supply circuit

Examples

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] Such as Figure 1 to Figure 3 As shown, a high PF and low THD LED driving switching power supply circuit is characterized in that it includes an electromagnetic interference filter circuit 10, an input rectification filter circuit 20, a power conversion circuit 30, an output rectification filter circuit 40, a DC output circuit 50, Voltage sampling feedback circuit 60, PWM control circuit 70 and AC input protection circuit 80 for connecting to AC mains;

[0041] The AC input protection circuit 80 is connected to the electromagnetic interference filter circuit 10. In this embodiment, the AC input protection circuit 80 includes a live wire input terminal L, a neutral line input terminal N, a varistor RV1, a fuse F1, a discharge Resistor RX1, bleeder resistor RX2, bleeder resistor RX3 and bleeder resistor RX4;

[0042] The live wire input ...

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PUM

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Abstract

The invention relates to a high PF and low THD LED driving switching power supply circuit, including an electromagnetic interference filter circuit, an input rectification filter circuit, a power conversion circuit, an output rectification filter circuit, a DC output circuit, a voltage sampling feedback circuit, a PWM control circuit and a It is used to connect the AC input protection circuit of the AC mains; the input rectification filter circuit includes a rectifier bridge BD1 and a π-type filter circuit, and the connection of the π-type filter circuit includes a polar capacitor C1, a polar capacitor C2 and an inductor L3, and a polar capacitor C1 and The polar capacitor C2 is a film capacitor. The overall circuit structure design is ingenious and reasonable, which can meet the harmonic requirements of high PF and low THD. Compared with the LED drive switching power supply circuit in traditional technology, its circuit structure is more simplified and saves circuit design. cost.

Description

technical field [0001] The invention relates to the technical field of LED driving switching power supply, in particular to a high PF and low THD LED driving switching power supply circuit. Background technique [0002] At present, in the lighting industry, LED lamps have won unanimous praise from consumers. LED lamps are used in trade, office, business and other occasions. They have high brightness, uniform light, beautiful appearance, energy saving and environmental protection. While LED lamps are widely praised, their important component—the driving power supply is also constantly being paid attention to. The existing LED driving switching power supply circuits generally have problems such as low PF value, high THD and complex structure, which lead to high circuit design costs. Also, the PF value of the existing LED driving switching power supply circuit. [0003] Therefore, in the patent application of the present invention, the applicant carefully studied a high PF a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/30H05B45/355H05B45/36H05B45/37H05B45/325H05B45/50
CPCH05B45/30H05B45/355H05B45/36H05B45/37H05B45/325H05B45/50
Inventor 李赵斌
Owner 东莞市德磬电子科技有限公司
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