倍频式感应加热电源负载输出频率为功率开关管工作频率的二倍，且功率开关器件工作时具有软开关特性，在需要高频应用的场合很有意义。文中以IGBT来实现倍频式高频感应加热电源，比较了不同频率比下的电路工作状态，得出电路工作在断态下更适合电路功率调节的结论。详细分析了断态下电路工作状况，得出直流等效电阻与交流负载等效电阻的关系，并给出了选取电路参数的经典方法。根据该方法设计了一台样机，通过实验验证了理论分析及参数选取方法的正确性。 ABSTRACT: Since its output frequency is as twice as the device frequency and it has the merit of soft-switching characteristic, multiple-frequency induction heater is widely used in high frequency application. An implementation of a multiple-frequency IGBT high frequency induction heating power supply is presented. By comparing the work status in different frequency ratio, it finds the best way of power regulation that is to keep the circuit working in the discontinuous mode. After specific analysis of this mode, the relationship between DC and AC load equivalent resistance and the circuit parameters selection strategy are concluded. At last, a prototype is designed and experimental results verify the correctness of the proposed analysis and parameters selection strategy. KEY WORDS: Power electronics; Induction heating power supply; Multiple frequency; IGBT
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