基于多电平逆变器的感应加热双频率输出设计

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摘要为了提高双频率感应加热设备的电源利用率,对基于多电平技术的双频感应加热的电压输出问题进行了研究。采用阶梯波近似模拟所需双频信号的合成波形,依据近似波形构造逆变器的输出电压波形。利用输出波形的傅里叶展开式,建立以逆变器触发延迟角为自变量的频率信号幅值方程。基于方程的求解结果,对所构造的输出电压信号和相同电平数的常规多电平信号进行基波调制系数及3次谐波调节范围的对比分析、所构造的输出电压信号具有更大的谐波调节范围。采用二极管钳位H桥逆变器拓扑,设计了实现所构造电压信号的逆变器触发方式,并兼顾考虑了逆变器分压电容的电压均衡问题。逆变器的仿真与实验结果验证了所提逆变器触发方式的有效性及对所构造信号计算分析的正确性。

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	冷朝霞
	刘庆丰

关键词 ：感应加热, 二极管钳位逆变器, 双频率输出, 谐波调节范围, 触发方式

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

收稿日期: 2016-06-02 出版日期: 2017-01-03

PACS:

TM46

作者简介: 冷朝霞女,1976年生,博士,讲师,研究方向为电力电子功率变换技术。E-mail: lengzhaoxia@xaut.edu.cn（通信作者）;刘庆丰男,1971年生,博士,副教授,研究方向为电力电子功率变换技术。E-mail: liuqingfeng@xaut.edu.cn

引用本文:

冷朝霞, 刘庆丰. 基于多电平逆变器的感应加热双频率输出设计[J]. 电工技术学报, 2016, 31(24): 195-204. Leng Zhaoxia, Liu Qingfeng. Design of Dual Frequency Output of Induction Heating Based on Multilevel Inverter. Transactions of China Electrotechnical Society, 2016, 31(24): 195-204.

链接本文:

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

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