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1. (WO2017157250) TOTEM-POLE BRIDGELESS POWER FACTOR CORRECTION CIRCUIT CONTROL METHOD AND APPARATUS

Pub. No.:    WO/2017/157250    International Application No.:    PCT/CN2017/076338
Publication Date: Fri Sep 22 01:59:59 CEST 2017 International Filing Date: Sat Mar 11 00:59:59 CET 2017
IPC: H02M 1/42
Applicants: ZTE CORPORATION
中兴通讯股份有限公司
Inventors: SUN, Hao
孙浩
HE, Wei
何维
LU, Zhifeng
卢至锋
JIANG, Hongbo
江洪波
Title: TOTEM-POLE BRIDGELESS POWER FACTOR CORRECTION CIRCUIT CONTROL METHOD AND APPARATUS
Abstract:
A totem-pole bridgeless power factor correction circuit control method and apparatus. The method comprises: acquiring a working mode of a totem-pole bridgeless power factor correction circuit; acquiring a first duty ratio (D) corresponding to a main transistor (Q2) and a second duty ratio corresponding to a free-wheeling transistor (Q1) in the totem-pole bridgeless power factor correction circuit in the working mode; controlling the working states of the main transistor and the free-wheeling transistor according to the first duty ratio and the second duty ratio; and before a zero crossing of an inductive current, disabling the free-wheeling transistor so as to avoid the occurrence of the problems that reverse loss exists in an input bridge arm rectifier tube and the inductive current is reverse during the decreasing process of the inductive current. Compared with a hardware zero-crossing detection circuit, the totem-pole bridgeless power factor correction circuit control method and apparatus do not need to add any hardware circuit. Therefore, low costs, a simple circuit and a high space utilization rate are achieved, and the overall efficiency of the circuit is improved.