变频微波炉电源用LLC谐振变换器

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Abstract A high-frequency soft switch power supply prototype was developed, which was technically designed to provide power source for magnetron in variable-frequence microwave oven. A LLC resonant converter whose output end combined with a voltage doubling rectifying circuit was used as its main circuit topology. The main circuit’ steady-state equivalent circuit model was established based on first harmonic analysis method. By means of the model the circuit’ DC gain, resonant current and zero-voltage-switching (ZVS) condition were theoretically analyzed, and the converter’ key parameters such as turns ratio of high frequency transformer, quality factor, excitation inductance, resonant inductance, resonant capacitance were optimized. The simulation result and the experimental verification indicate that the established steady-state equivalent circuit model and its theoretical analysis are correct, and the resonant network parameters’ theoretical analysis and its optimal design are correct. The results have practical significance for analyzing, studying, improving magnetron power supply and guiding its production.

Key words： Microwave oven magnetron LLC resonant converter ZVS FHA

Received: 09 March 2011 Published: 20 March 2014

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TM464

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	Wang Chunfang
	Xu Qinchao

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Wang Chunfang,Xu Qinchao. Study of LLC Resonant Converter for Variable-Frequence Microwave Oven Power Supply[J]. Transactions of China Electrotechnical Society, 2012, 27(6): 103-109.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2012/V27/I6/103

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