Low Output Voltage Ripple Discontinuous Mode Flyback Power Factor Correction Converter

A power factor correction, low output voltage technology, applied in output power conversion devices, regulating electrical variables, high-efficiency power electronic conversion, etc. The effect of volume, current spike reduction, and output voltage ripple reduction
CN104967323BActive Publication Date: 2017-08-04NANJING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF SCI & TECH
Publication Date
2017-08-04

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Abstract

The invention discloses a low-output-voltage-ripple discontinuous-mode flyback power factor correction converter. The converter comprises a Flyback converter main power circuit, an output voltage feedback control circuit, a control drive circuit, and an input voltage feedforward circuit. The input voltage feedforward circuit comprises an input voltage sampling following circuit, an input voltage peak sampling circuit, a subtraction circuit, and a multiplying circuit. The output end of the input voltage sampling following circuit is connected with one input end of the subtraction circuit, and the output end of the input voltage peak sampling circuit is connected with the other input end of the subtraction circuit and one input end of the multiplying circuit. The output end of the subtraction circuit is connected with the other input end of the multiplying circuit. According to the invention, the input voltage feedforward circuit is introduced, thereby enabling the duty ratio of a switching tube to change regularly in a period of a working frequency, and finally achieving the output voltage ripple.
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Description

technical field

[0001] The invention belongs to the technical field of AC-DC converters in electric energy conversion devices, in particular to a low output voltage ripple discontinuous mode flyback power factor correction converter. Background technique

[0002] A power factor correction (Power Factor Correction, PFC) converter can reduce input current harmonics and improve input power factor, and has been widely used. PFC converters are divided into active and passive methods. Compared with passive methods, active power factor correction has the advantages of high input power factor, small size, and low cost.

[0003] The active PFC converter can adopt a variety of circuit extension and control methods, among which the Flyback converter is one of several basic converters. According to whether the inductor current is continuous, it can be divided into three operating modes: the inductor current continuous mode ( Continuous Current Mode, CCM), inductor current critical cont...

Claims

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