Totem pole power factor correction circuit employing semi power frequency periodic resonance soft switching structure

Abstract

The invention relates to a totem pole power factor correction circuit employing a semi power frequency periodic resonance soft switching structure. The totem pole power factor correction circuit includes a main power circuit for totem pole typology, an auxiliary switch circuit used for realizing resonance soft switching of the totem pole PFC circuit, an input voltage ZCP (Zero Crossing Point) detecting circuit, an input current detecting circuit, an output voltage detecting circuit and a control circuit controlling the main power circuit and the auxiliary switching circuit according to the voltage ZCP detecting circuit, the input current detecting circuit and the output voltage detecting circuit. The control circuit outputs drive pulses according to detection signals of the output voltage detecting circuit, the input current detecting circuit and the input voltage ZCP detecting circuit so as to control the auxiliary switch circuit and the totem pole PFC circuit to achieve resonance and enable zero voltage conduction of a power switching tube of the totem pole PFC circuit. Therefore, switching loss of the main circuit is reduced and the overall efficiency is improved.

Description

technical field [0001] The invention relates to a single-phase power factor correction circuit (PFC), in particular to a totem pole structure power factor correction circuit (PFC) capable of resonant soft switching within half a power frequency cycle. Background technique [0002] High efficiency, high power factor, and low cost have always been the development goals of power factor correction circuit (PFC) technology. Compared with the commonly used full-bridge PFC and Dual Boost PFC, the totem-pole PFC uses fewer power semiconductor devices, and the reverse recovery loss of the power-frequency diode is also small, which has advantages in efficiency and cost. . However, most of the power switch tubes of the existing totem-pole structure PFC work in a hard switching state, and the switching loss and voltage stress are relatively large. With the development of a new generation of high-speed semiconductor switching device technologies such as gallium nitride (GaN) and silico...

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Problems solved by technology

However, this scheme can only realize soft switching in the whole cycle of the power grid, that is, the positive half cycle and the negative half cycle.

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