TRANSITION MODE COMMUTATION FOR INVERTER

摘要

A driver circuit includes a plurality of switches, forming two switching legs, each of at least two switches and connected between two DC voltage buses. The switches are matched to form diagonal pairs. The driver circuit also includes a load circuit connecting the legs, with a first inductor connected between one legs switches, and a second inductor connected between the others switches, and lamp terminals between the inductors and in series with the second inductor. The driver circuit also includes a capacitor in parallel with the seriesconnected lamp terminals and the second inductor, and a control circuit connected to the plurality of switches. During a commutation period, a diagonal pair operates in a nonconductive state and the other in a conductive state, until a current through the first inductor reaches a predefined value. Then the other operates in a nonconductive state until the current through the first inductor reaches zero.