Shuhao Li
ABSTRACT
Industrial induction heating has much possibility in wide range of industries due to its high performance and efficiency. Dual-frequency is becoming promising in induction heating power supply as it is helpful for obtaining better surface hardening for workpieces with irregular shape. Conventional method to obtain dual-frequency is to couple two full-bridge inverters’ outputs with different frequencies through a transformer. However, redundancy increase volume and cost. Topology with single full-bridge inversion is a cost-effective solution. Con-sidering difficulty of controlling output power share in this topology, this paper proposed a decoupled power regulation method. This modulation allowing full control of both the medi-um-frequency and high-frequency power in the output. Topology of the power supply and its operational principle is firstly analyzed. Then rationale of the proposed regulation method is elaborated. After designing of the system parameters, a simulation model in Matlab/Simulink is established. Effectiveness of the proposed method is verified by simulation results.
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