Auxiliary resonant converter pole inverter with minimized phase-dependent ZVT magnetization current

Abstract

The invention discloses an auxiliary resonant converter pole inverter with minimized phase-associated ZVT magnetizing current. The auxiliary resonant converter pole inverter comprises a main circuit and an auxiliary circuit, a phase-shifted full-bridge network charges an auxiliary resonance electrode inductor through an isolation transformer to realize ZVS of a main switch, and ZVS of an auxiliaryswitch is realized through energy storage in the excitation inductor. The commutation charging phase and the reset phase are locked and inversely associated, so that magnetization current bidirectional reset is realized, and the volume of the magnetic core is reduced. The improved time sequence modulation effectively reduces the follow current loss of the magnetizing current and the turn-off lossof the auxiliary switch. A phase correlation method is used for keeping the existing technology, the advantage of zero-voltage switching of a main switch tube is achieved, the switching loss of the main switch is reduced, in addition, zero-voltage switching of the auxiliary switch in an auxiliary loop is achieved through energy storage in the excitation inductor, and the withstand voltage value of the auxiliary switch is far smaller than that of the main switch. Magnetizing current reset is reliably realized in each switching period, and the problem of overvoltage of auxiliary converter diodes Dc1 and Dc2 is solved through coupling of a secondary winding of the transformer.

Description

technical field [0001] The invention relates to the technical field of power electronic conversion, in particular to an auxiliary resonant commutation pole inverter with phase-correlated ZVT magnetization current minimization. Background technique [0002] The voltage source inverter (VSI), essentially a synchronous rectification buck-boost converter composed of a fully-controlled switching half-bridge, is widely used in applications of various power levels, such as: motor drives, active power filter, uninterruptible power supply (UPS), photovoltaic power system, fuel cell power system and distributed power grid, etc. The core of its research is to improve efficiency and power density. [0003] Under hard-switching conditions, power density is usually increased by increasing the switching frequency to reduce the size and weight of passive components such as filter inductors and capacitors, but increasing the switching frequency results in switching losses and high-frequency...

AI Technical Summary

Problems solved by technology

In the above two methods, one coupled inductor can only realize the zero-voltage turn-on of one main switch tube, so two coupled inductors need to be used in an auxiliary circuit, thus increasing the volume, cost and leakage inductance loss of the transformer

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