New Half-bridge Series-parallel Resonant Power Supply for High Frequency Induction Heating Sealing Equipment

A high frequency induction heating power supply using series-parallel resonant circuit is proposed.The operation principle of the half-bridge series-parallel resonant converter is analyzed,and the structure and controlling circuit of the switching power supply for high frequency induction heating sealing equipment are introduced.The operating frequency is 500 kHz and the output power is 2 kW.The equipment can be applied for wrapper contactless sealing.Experimental results show that the prototype can provide the adjustable sinusoidal voltage and current and the performance meets the design.The prototype is working successfully in industries.