FULL-BRIDGE INVERTER WITH UNIPOLAR SWITCHING SCHEME AND ITS METHOD OF OPERATION

摘要

A full-bridge inverter based on a unipolar switching scheme includes a first branch and a second branch in parallel between a first DC node and a second node, the first branch including a first higher switch and a first lower switch in series, and the second branch including a second higher switch and a second lower switch in series. A filter circuit includes a first inductor and a second inductor. One pin of the first inductor is coupled with a first branch conductor, and the first branch conductor is coupled between the first higher switch and the first lower switch, and an opposite pin of the first inductor is electrically coupled with a first output node. One pin of the second inductor is coupled with a second branch conductor, the second branch conductor is coupled between the second higher switch and the second lower switch, and an opposite pin of the second inductor is coupled with a second output node of the full-bridge inverter. A first filtering unit switch, a first filter diode, a second filter diode and a second filtering unit switch in series are coupled between the first branch conductor and the second branch conductor, cathodes of the first diode and the second diode are coupled together. A cathode of a third filter diode is coupled with the first output node, and a cathode of a fourth filter diode is coupled with the second output node. The anodes of the third diode and the fourth diode are coupled together. A third inductor is coupled between the cathodes of the first diode and the second diode and the anodes of the third diode and the fourth diode.