感应加热电压型逆变器负载匹配的研究

Reseach on induction heating voltage source inverter load matching

对感应加热电压型逆变器LLC谐振回路特点进行了简要分析,为了解决MOSFET构成的单向全桥逆变器在LLC负载品质因数Q值较低时,开关器件工作角度较大,损耗增加的问题,提出了一种适用于高频感应加热电压型逆变器的新型LCLC负载谐振匹配方案。该方案通过加入附加电容Cs,减小了逆变器输出电压和输出电流间的相位角,从而降低开关损耗,提高电源输出功率。对该拓扑结构的谐振特性和负载输出功率进行了理论分析,最后通过实验验证了理论分析的正确性。

The LLC resonant topology characteristic of induction heating voltage source inverter is discussed briefly in this paper.To solve the problems that the switch components would work at large phase angle and the switch losses would increase under the low quality factor Q in MOSFET single phase full-bridge high frequency inverter LLC resonant load,this paper presents a new LCLC load matching topology for high-frequency induction heating voltage source inverter.By adding additional capacitor Cs,the phase angle of the switch components and switch losses can be reduced,meanwhile,output power could be improved.The proposed LCLC resonant characteristics and load output power are discussed in detail and the experimental results validate the proposed approach.