A 99% efficiency SiC three-phase inverter using synchronous rectification

2016 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2016-03-20 DOI:10.1109/APEC.2016.7468281

S. Yin, K. Tseng, C. Tong, R. Simanjorang, C. Gajanayake, A. Gupta

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引用次数: 26

Abstract

The reactive power in power converter with inductive load (motor drive e.g.) requires a current commutation path for the freewheeling current. Due to the high voltage drop of body diode of SiC MOSFET, a SiC Schottky diode is normally recommended as the anti-parallel freewheeling diode for SiC MOSFET to suppress the conduction of body diode. However, since the MOSFET can work as synchronous rectifier, the freewheeling diode only conducts during the dead time, leading to a low utilization rate of device. In this work, the three-phase SiC inverter using synchronous rectification is investigated. The analytical model for inverter power loss with and without freewheeling diode is built. Based on the switching characterization, the inverter with synchronous rectification permits a surprising higher efficiency than that with freewheeling diode due to the reduced current overshoot at turn-on. And a 5 kW prototype of three-phase inverter is developed, which shows a 99% high efficiency at the switching frequency of 40 kHz. This work confirms the possibility to remove the freewheeling diode in SiC inverter without degrading the efficiency.

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采用同步整流的99%效率SiC三相逆变器

带感性负载(如电机驱动)的功率变换器中的无功功率需要一个自由流动电流的电流换流路径。由于SiC MOSFET体体二极管的高压降高，通常推荐使用SiC肖特基二极管作为SiC MOSFET的反并联自由流二极管来抑制体体二极管的导通。然而，由于MOSFET可以作为同步整流器工作，自由转动二极管只在死区导通，导致器件利用率低。本文对采用同步整流的三相SiC逆变器进行了研究。建立了带自由转二极管和不带自由转二极管的逆变器功率损耗分析模型。基于开关特性，具有同步整流的逆变器由于减少了导通时的电流超调而比具有自由流二极管的逆变器具有令人惊讶的更高效率。并研制了5 kW的三相逆变器样机，在开关频率为40 kHz时，效率高达99%。这项工作证实了在不降低效率的情况下去除SiC逆变器中自由转动二极管的可能性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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