| Abstract |
In voltage inverter legs operating at high frequency, and especially in resonant inverters, the type of control and the commutation mecanisms have a strong influence on the control of the power transferred to the load and on the stress imposed on the switches. In the first part of the paper the different modes of operation of a voltage inverter leg are recalled and an analysis of the pros and cons of the utilization of the MOS transistors in each case is exposed. Then, a new control law allowing extended operating area, in particular no-load and unity power factor operation, while keeping the advantages of the Dual Thyristor operation (-ZVS) is proposed. This study is validated by means of a 5kW prototype using MOS transistors operating beyond 150kHz. |
