Totem-pole bridgeless circuit, surge protection method thereof and power supply module

By designing slow and fast bridge arm units in a totem pole bridgeless circuit, and paralleling current sampling and surge protection units, and using a hysteresis comparator to control the switching transistor to disconnect, the problem of bridge arm unit damage under surge current is solved, and fast and effective surge protection is achieved.

CN115580161BActive Publication Date: 2026-07-07HYNETEK SEMICON CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HYNETEK SEMICON CO LTD
Filing Date
2022-10-28
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

In the case of surge current generated by lightning strikes at the AC input, the switching transistors in the bridge arm unit of the totem pole bridgeless circuit are easily damaged, making it unable to effectively protect against surge currents, especially surge currents generated by reverse lightning strikes.

Method used

Design a totem pole bridgeless circuit, including a slow bridge arm unit and a fast bridge arm unit, an AC input unit, a current sampling unit and a surge protection unit connected in parallel. The current sampling unit collects the rate of change of current, and the hysteresis comparator and controller control the switching transistor to disconnect to achieve surge protection.

Benefits of technology

It achieves effective surge protection for totem pole bridgeless circuits and power modules. It has a simple structure, fast response speed, and can protect against in-phase and out-of-phase lightning strikes on AC power supplies.

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Abstract

The embodiment of the present application relates to the field of power electronics, and discloses a totem pole bridgeless circuit, a surge protection method thereof and a power module, the circuit comprising a slow bridge arm unit and a fast bridge arm unit in parallel, an alternating current input unit connected between the midpoints of two switching tubes in the slow bridge arm unit and the midpoints of two switching tubes in the fast bridge arm unit, a current sampling unit and a surge protection unit, the current sampling unit comprising sampling resistors connected in series with the two switching tubes in the slow bridge arm unit respectively, when the current sampling unit collects a surge current, the first slow switching tube, the second slow switching tube, the first fast switching tube and the second fast switching tube are controlled to be turned off by the surge protection unit, thereby achieving surge protection of the totem pole bridgeless circuit and the power module, and the circuit structure of the totem pole bridgeless circuit is simple and the reaction speed is fast.
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