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Single-stage high-power-factor and low-output-ripple Flyback/Sepic LED driving circuit

A high power factor, driving circuit technology, applied in the direction of DC power input conversion to DC power output, high-efficiency power electronic conversion, output power conversion device, etc., can solve the problem of reducing output low-frequency ripple, loss, and reducing LED service life and other problems, to achieve the effect of eliminating power frequency current ripple, reducing system cost, and strong ripple removal ability

Inactive Publication Date: 2018-09-28
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single-stage PFC flyback converter has a large output low-frequency ripple, which will affect the light efficiency of the LED light, causing the LED light to flicker, thereby reducing the service life of the LED.
However, there are some existing ripple removal methods. Some solutions reduce the output low-frequency ripple by sacrificing the PF value, and increase the design complexity of the converter; some solutions sacrifice efficiency and cause additional losses.

Method used

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  • Single-stage high-power-factor and low-output-ripple Flyback/Sepic LED driving circuit
  • Single-stage high-power-factor and low-output-ripple Flyback/Sepic LED driving circuit
  • Single-stage high-power-factor and low-output-ripple Flyback/Sepic LED driving circuit

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Embodiment Construction

[0024] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0025] The present invention provides a single-stage high power factor and low output ripple Flyback / Sepic LED drive circuit, such as figure 1 As shown, including: input AC power supply, diode rectifier bridge BD 1 , Flyback PFC circuit with auxiliary winding and auxiliary de-ripple Sepic circuit; Flyback PFC circuit with auxiliary winding includes: high frequency transformer T 1 , the first power MOS switch tube S 1 , the first power diode D 1 , the second power diode D 2 and the first electrolytic capacitor C o1 ; The auxiliary ripple removal Sepic circuit includes: the second power MOS switch tube S 2 , the third power diode D 3 , the first high frequency capacitor C 1 , the second high frequency capacitor C 2 , the second electrolytic capacitor C o2 , the first high frequency inductance L 1 and the second high frequency indu...

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Abstract

The invention relates to a single-stage high-power-factor and low-output-ripple Flyback / Sepic LED driving circuit. The single-stage high-power-factor and low-output-ripple Flyback / Sepic LED driving circuit comprises an input alternating-current power supply AC, a diode rectifier bridge BD<1>, a Flyback PFC circuit with an auxiliary winding and an auxiliary ripple removing Sepic circuit. Accordingto the single-stage high-power-factor and low-output-ripple Flyback / Sepic LED driving circuit provided by the invention, due to construction of the LED driving circuit that a single-stage AC-DC converter Flyback and an auxiliary converter Sepic circuit are combined, functions, such as high efficiency, high power factor, low output ripple and constant current output, are realized.

Description

technical field [0001] The invention relates to the design field of LED lighting drive power supply, in particular to a single-stage Flyback / Sepic LED drive circuit with high power factor and low output ripple. Background technique [0002] Traditional LED is the fourth generation of lighting source, which has the advantages of energy saving, environmental protection, small size and long life. LED has the characteristics of unidirectional conductivity and non-linearity, so it is suitable for constant current drive. To design an LED drive power supply, it is first necessary to select an appropriate circuit structure. According to different application occasions and requirements, it can generally be divided into single-stage PFC scheme and two-stage structure scheme, both of which have their own advantages and disadvantages according to the application power occasion and specific application requirements. The two-stage PFC scheme has the advantages of small total harmonic di...

Claims

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Application Information

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IPC IPC(8): H05B33/08H02M3/335H02M1/42H02M1/14H05B44/00
CPCH02M1/14H02M1/42H02M3/33523H05B45/37Y02B70/10
Inventor 林维明莫炫飚
Owner FUZHOU UNIV
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