An Auxiliary Resonant Commutated Pole Inverter with Phase-Linked ZVT Magnetization Current Minimization

Abstract

The invention discloses an auxiliary resonant commutation pole inverter with phase-correlated ZVT magnetization current minimization, which includes a main circuit and an auxiliary circuit; the phase-shifting full-bridge network charges the auxiliary resonant pole inductance through an isolation transformer to realize the main switch. ZVS; the energy storage in the magnetizing inductance realizes the ZVS of the auxiliary switch. The commutation charging phase is anti-correlated with the reset phase locking, which realizes the bidirectional reset of the magnetizing current and reduces the volume of the magnetic core. The improved timing modulation effectively reduces the freewheeling loss of the magnetizing current and the turn-off loss of the auxiliary switch. Using the phase correlation method to maintain the existing technology, realize the advantages of zero-voltage turn-on of the main switch tube, reduce the switching loss of the main switch, in addition, the auxiliary switch in the auxiliary circuit also realizes zero-voltage turn-on through the energy storage in the excitation inductance And its withstand voltage value is much smaller than that of the main switch; and the magnetizing current reset is reliably realized in each switching cycle, and the secondary winding coupling of the transformer solves the problem of the auxiliary commutation diode D c1 and D c2 overvoltage problem.

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 is essentially a synchronous rectification buck-boost converter composed of a fully-controlled switching half-bridge, which is widely used in applications of various power levels, such as: motor drives, active power filters , 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, the power density is usually increased by reducing the size and weight of passive components by increasing the switching frequency, but increasing the switching frequency will lead to an increase in switching loss and high-frequency electromagne...

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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