Input diodeless wide output pfc converter based on cuk and sepic

By connecting the SEPIC circuit unit and the Cuk circuit unit in parallel and in series to form a new topology without a rectifier bridge, the problems of high switch tube voltage stress, large conduction loss and large electromagnetic interference in the traditional PFC converter are solved, and efficient output voltage regulation and simplified circuit control are achieved.

CN119891698BActive Publication Date: 2025-10-17SOUTHWEST JIAOTONG UNIV
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Patent Information

Application Number
CN202510062907.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-01-15
Publication Date
2025-10-17
Estimated Expiration
2045-01-15

AI Technical Summary

Technical Problem

Traditional buck-boost PFC converters with step-up and step-down output capabilities have problems such as high switch voltage stress, large switch conduction loss, and large electromagnetic interference. Traditional Cuk and SEPIC PFC converters also have large electromagnetic interference.

Method used

A Cuk and SEPIC-based wide-output PFC converter without input diode is adopted. By connecting the SEPIC circuit unit and the Cuk circuit unit in parallel at the input end and in series at the output end, a new topology without a rectifier bridge is formed. The synchronous operation of the switching tube is achieved by single voltage closed-loop control.

Benefits of technology

It reduces energy loss, simplifies circuit structure, reduces voltage stress of switch tube, reduces electromagnetic interference, and has the ability to step up or down the output voltage, thus realizing simple closed-loop control.

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Abstract

The application discloses an input-diode-free wide-output PFC converter based on Cuk and SEPIC, and relates to the technical field of PFC converters.The topology structure of the PFC converter comprises a SEPIC circuit unit, a Cuk circuit unit and an output capacitor C p and an output capacitor C n ; the SEPIC circuit unit comprises a switch tube S S , an input inductor L S1 , an intermediate capacitor C S , a diode D S and an inductor L S2 ; the Cuk circuit unit comprises a switch tube S C , an input inductor L C1 , an intermediate capacitor C C , a diode D C and an inductor L C2 ; the SEPIC circuit unit and the Cuk circuit unit are connected in parallel at the input end and in series at the output end, so that the output voltage is boosted or bucked.The input-diode-free wide-output PFC converter based on Cuk and SEPIC in the application completely eliminates a diode rectifier bridge, so that the circuit is reduced in energy loss and simplified in structure; meanwhile, the voltage stress of the switch tube is greatly reduced compared with a traditional Buck-boost PFC converter, and the output voltage still has the ability of being boosted or bucked.
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Citation Information

Patent Citations

  • Single-stage bridgeless PFC converter and control method

    CN117060708A