Bridgeless voltage-multiplying PFC circuit

By using a bridgeless voltage doubler PFC circuit topology, the voltage width requirement problem under the compatibility of single-phase 220V and three-phase 380V switching power supplies is solved, achieving efficient and low-cost voltage conversion and improving the performance of the switching power supply.

CN224571113UActive Publication Date: 2026-07-28WUHAN YONGLI TECH CO LTD
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Patent Information

Application Number
CN202521341413.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-06-27
Publication Date
2026-07-28
Estimated Expiration
2035-06-27

AI Technical Summary

Technical Problem

In existing technologies, single-phase 220V and three-phase 380V switching power supplies have wide power factor correction output voltage requirements in compatibility scenarios, resulting in problems such as high device cost, low efficiency, and EMI degradation.

Method used

The PFC circuit topology employs a bridgeless voltage multiplier, utilizing switching units composed of MOSFETs or IGBTs of the same specification, combined with a drive control module and capacitors to form a bridgeless structure, thereby achieving the conversion of single-phase AC 220V to DC 750V, reducing voltage stress and improving efficiency.

Benefits of technology

It achieves efficient conversion from single-phase 220V to 750V, reduces device costs, and improves the efficiency and anti-interference capability of the switching power supply.

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Abstract

The utility model discloses a bridgeless voltage-multiplying PFC circuit. The bridgeless voltage-multiplying PFC circuit comprises a power factor inductor, a switch unit, a drive control module, a first output capacitor, a second output capacitor, a first fly-wheel diode and a second fly-wheel diode. The other end of the power factor inductor is respectively connected with the input end of the switch unit and the anode of the first fly-wheel diode, and the output end of the switch unit is connected with the cathode of the alternating-current power supply; the cathode of the first fly-wheel diode is connected with one end of a first output capacitor, the other end of the first output capacitor is connected with a second output capacitor, and the node of the first output capacitor and the second output capacitor is connected with the cathode of the AC power supply; the other end of the second output capacitor is connected with the anode of a second freewheeling diode, and the cathode of the second freewheeling diode is connected with the anode of the first freewheeling diode; the output end of the drive control module is connected with the control end of the switch unit and outputs control signals to control on-off of the switch device. The utility model does not need a rectifier bridge, converts single-phase voltage into high-voltage direct current, and is high in efficiency and low in cost.
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