A Bridgeless Double Boost Power Factor Correction Rectifier with Alternate Up and Down Auxiliary Commutation

Abstract

The invention discloses a bridgeless double Boost power factor correcting rectifier with alternating up and down auxiliary commutation, which can realize ZVS conduction of a main circuit switch and an auxiliary circuit switch. The fully controlled switch replaces the rectifier diode of the basic bridgeless circuit, and the main circuit has two charging states. The alternately working auxiliary circuit realizes the bidirectional reset of the excitation current, thus reducing the volume of the transformer magnetic core. The secondary winding coupling of the transformer reduces the voltage stress of the auxiliary commutation diode.

Description

technical field [0001] The invention relates to the technical field of power electronic conversion, in particular to a bridgeless double Boost power factor correction rectifier with alternate up and down auxiliary commutation. Background technique [0002] Among many PFC circuits, Boost converters are widely used because of their simple structure, continuous input current and strong uniformity of characteristics. Among them, the bridgeless BoostPFC reduces the conduction loss by reducing the number of semiconductor devices on the working circuit, so as to achieve the purpose of improving efficiency. However, the problem of switching loss in bridgeless PFC is prominent. When the switching frequency is increased, the switching loss in the circuit will increase accordingly, especially when the circuit works in CCM, the reverse recovery current of the freewheeling diode will increase the switching Turn-on loss of the tube. In order to reduce switching loss and dynamic switchin...

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Problems solved by technology

However, there are three types of problems in the ZVT-2CI inverter series: 1) When the switch ZCS of the auxiliary circuit is turned on, only the equivalent output capacitor can be used for energy storage, the smaller IGBT device, the conduction loss and EMI cannot be ignored; 2) ), the excitation current is unidirectionally reset, resulting in the large volume of the selected transformer core, and two sets of auxiliary circuits are required to realize the auxiliary commutation work of the main switch under bidirectional current output; 3), the auxiliary commutation diode has no clamping measures, and the overcharge Ringing causes high voltage stress and EMI

4) In high-frequency applications, under the small duty cycle of the main circuit, the commutation preparation time is insufficient

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