半桥串联谐振逆变器的非线性控制方案

本文介绍了半桥串联谐振逆变器的非线性控制方案的分析与设计,并提出了一个零电流转换非线性控制逆变器的设计.其电路拓扑包括两个功率开关、一个输出滤波器.逆变时,在功率通量回路中只有一个功率开关上有传导损耗.开关的零电流开通是通过扼流圈前级的辅助谐振回路实现的.非线性控制方案可以抑制直流输入扰动,并能对正弦脉宽调制控制进行有效的动态调节.我们使用了空间状态平均值的方法来对系统进行分析.文中以一个功率为500 W的逆变器作为设计示例,并对其性能进行评估,该逆变器在额定功率下,可以获得91%以上的效率.

Nonlinear-Control Strategy for the Half-Bridge Series-Resonant Inverter

This paper concerns the analysis and design of the half-bridge series-resonant inverter with nonlinear-control strategy. A zero-current-switching (ZCS) half-bridge series-resonant inverter with nonlinear control is built. The presented circuit topology is simply configured bytwo power switches and one output filter. Only one conduction loss of the power switch is present in the power flow path during the inversionperiod. A turn-on ZCS for the power switch is achieved by an auxiliary resonant cell built before the output choke. The nonlinear-control strategyis designed against the input dc perturbation and achieves well dynamic regulation for the sinusoidal pulsewidth-modulation control. A state-spaceaveraging approch is employed to analyze the system. A design example of a 500-W inverter is examined to assess the inverter performance andit provides high power efficiency above 91% under the rated power.