Bridgeless double-Boost power factor correction rectifier for left-right alternating auxiliary current conversion

Abstract

The invention discloses a bridgeless double-Boost power factor correction rectifier for left-right alternating auxiliary current conversion. ZVS conduction of a main loop switch and an auxiliary loopswitch can be realized. A fully-controlled switch replaces a rectifier diode of a basic bridgeless circuit, and a main loop has two charging states. Two-way reset of exciting current is achieved through the auxiliary loops working alternately, and therefore the size of a transformer magnetic core is reduced. Coupling of the secondary winding of the transformer reduces the voltage stress of the auxiliary converter 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 left and right alternate 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 Boost PFC reduces the conduction loss and improves the efficiency by reducing the number of semiconductor devices on the working circuit (08003359: [8]–[21]). 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 switching...

AI Technical Summary

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 IGBT devices with small EOSS (equivalent output capacitor energy storage) can be used, and the conduction loss and EMI cannot be ignored; 2) The unidirectional reset of the excitation current leads to the large volume of the transformer magnetic core selected, and two sets of auxiliary circuits are required to realize the auxiliary commutation work of the main switch under the bidirectional current output; 3) The auxiliary commutation diode has no clamping measures, and the overcharge vibration Bells cause 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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