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