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
CN112888109BActive Publication Date: 2022-05-10东莞市德磬电子科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
东莞市德磬电子科技有限公司
Publication Date
2022-05-10

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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.
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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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