ZVS VOLTAGE SOURCE INVERTER

摘要

Systems and methods relating to zero voltage switching for inverters. A full bridge inverter is used in conjunction with a passive auxiliary circuit and an output filter. A control system controls the current by way of the auxiliary circuit and injects a high quality current to a power grid. The control system adjusts the duty ratio and switching frequency of the gate pulses applied to the power semiconductors in the full-bridge inverter. As well, the control system adjusts the phase shift between gate pulses for both the leading leg and lagging leg power semiconductors to control the current passing through the auxiliary circuit.

主权项

1. A circuit comprising:
a DC bus capacitor; a full bridge inverter coupled in parallel to said DC bus capacitor; an output filter coupled to said full bridge inverter; an auxiliary circuit coupled to said inverter;wherein
said full bridge inverter comprises a leading leg and a lagging leg, each leg comprising a pair of power semiconductor subcircuits coupled in series to each other, said leading leg having its pair of power semiconductor subcircuits being coupled to each other at a first coupling point, said lagging leg having its pair of power semiconductor subcircuits being coupled to each other at a second coupling point; said auxiliary circuit comprises an auxiliary inductor coupled in series to an auxiliary capacitor, said auxiliary circuit being coupled between said first coupling point and said second coupling point; said output filter comprises a pair of inductors and a capacitor, said pair of inductors being coupled to each other in series by way of a third coupling point, said capacitor being coupled between said second coupling point and said third coupling point, a first one of said pair of inductors being coupled to said first coupling point; an output of said circuit being coupled between said second coupling point and a second one of said pair of inductors.