基于多电平逆变器的感应加热双频率输出设计

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Abstract In order to improve the power utilization rate of dual frequency induction heating equipment, this paper studied the voltage output problems of dual frequency induction heating based on the multilevel technology. The synthetic waveform of the dual frequency signal was approximately simulated by the step wave. And then this approximate wave form was applied to construct the output voltage waveform of the inverter. By using the Fourier expansion of the output waveform, the amplitude equations of the frequency signal were established, in which the independent variable was the trigger angle of the inverter. After that, the fundamental modulation coefficient and the three-harmonic regulation range of the constructed output voltage signal were analyzed, which were compared with the conventional multilevel signal with the same level number. The constructed output voltage signal has a larger range of harmonic regulation. The diode clamped H-bridge inverter topology was adopted. The driving mode of inverter was designed to realize the constructed voltage signal, taken into account the voltage balancing problem of the partial-voltage capacitances. The simulation and experimental results verify the proposed driving mode as well as the correctness of the calculation and analysis of the constructed voltage signal.

Key words： Induction heating, diode clamped inverter, dual frequency output, harmonic regulation range, driving mode

Received: 02 June 2016 Published: 03 January 2017

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	Leng Zhaoxia
	Liu Qingfeng

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Leng Zhaoxia,Liu Qingfeng. Design of Dual Frequency Output of Induction Heating Based on Multilevel Inverter[J]. Transactions of China Electrotechnical Society, 2016, 31(24): 195-204.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I24/195

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