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LIU Wei,LYU Zhengyu.Interleaved PWM Method for Three-level DC/DC Converter[J].JOURNAL OF POWER SUPPLY,2018,16(2):11-17
Interleaved PWM Method for Three-level DC/DC Converter
Received:November 27, 2017  Revised:January 05, 2018
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Keywords:pulse width modulation  three-level  voltage-balancing
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
LIU Wei College of Electrical Engineering, Zhejiang University, Hangzhou , China
LYU Zhengyu College of Electrical Engineering, Zhejiang University, Hangzhou , China eeluzy@zju.edu.cn
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      Since the voltage stress on power switches is only half of the input voltage through the utilization of a three-level(TL) structure, TL converters have been widely used in high-voltage applications. To ensure the normal oper-ation of TL converters, the voltages on the input-divided capacitors and the blocking capacitor must be balanced basically, whereas the asymmetry of time-delay in the drive circuit may result in voltage unbalance in practice. In this paper, a novel pulse width modulation(PWM) method with better voltage-balancing ability is proposed, which is imple-mented by interleaving two traditional PWM methods. The new PWM method decouples the blocking capacitor voltage from the voltages of input-divided capacitors, and ensures that the former voltage is always kept around its ideal value, which greatly simplifies the sampling circuit and the voltage-balancing strategy. In this way, only the phase shift between driving signals need to be adjusted to achieve voltage balance. Experimental results verified the effectiveness of the proposed modulation method and voltage-balancing strategy.