关键词: 逆变器, 桥臂, 辅助电路, 并联, 开关损耗, 零电压开通, 谐振

Abstract: Metal oxide semiconductor field effect transistor (MOSFET) is often used as the switching devices in medium and small power single-phase full-bridge inverters. To realize energy-saving operation of the inverters at high switching frequency, a single-phase full-bridge energy-saving resonant pole inverter topology is proposed. The same auxiliary resonant circuit is connected with parallel on the bridge arm. Before the main switch on the bridge arm is switched on, the voltage across its parallel resonant capacitor becomes zero periodically, which makes the main switch achieve zero-voltage soft-switching and eliminates the capacitive switching loss of MOSFET. It is conducive to the energy-saving operation of the inverter. In this paper, the working mode of the circuit is analyzed. The experimental results show that the main switching devices achieve zero-voltage soft-switching. Therefore, this topology has reference value for the research and development of high-performance medium and small power single-phase full-bridge inverters.

Key words: inverter, bridge arm, auxiliary circuit, parallel, switching loss, zero-voltage turn on, resonance