一种控制简单的谐振极型软开关逆变器

A Resonant Pole Soft Switching Inverter With Simple Control

目前,多数的谐振极型软开关逆变器拓扑结构中都设置了辅助开关器件来控制谐振过程,其控制方式要比原来的硬开关逆变器复杂。此处提出了一种控制简单的谐振极型软开关逆变器,其拓扑结构中无功率开关器件,用正弦脉宽调制(SPWM)控制方式即可自然实现开关器件的零电流开关(ZCS)开通和零电压开关(ZVS)关断,而且通过拓扑结构中的储能元件,在死区时间内,输出相电流可以续流,降低了死区的影响,减小了输出相电流在低频时的畸变率。对其工作原理进行了分析,最后通过实验验证了原理的正确性。

Nowadays auxiliary switching devices are designed in the majority of the resonant pole inverters to control resonance processes.The control strategy is more complicated than hard switching inverter.So a resonant pole inverter with simple control is proposed.There are no auxiliary switching devices in the new topology.Using sinusoidal pulse width modulation （SPWM） can realize zero current swithing （ZCS） turing on and zero voltage switching （ZVS） turing off.In addition,freewheeling of output current can be realized via energy storage components in the dead-time and the effect of dead-time is reduced.The distortion ratio of the output phase current in low frequency is also reduced.The analysis of the circuit are presented.Experimental results are proposed to verify the theoretical analysis.