一种采用无损有源箝位辅助电路的软开关高频链DC-AC变换器

发布时间：2018-01-14 03:27

本文关键词：一种采用无损有源箝位辅助电路的软开关高频链DC-AC变换器　出处：《中国电机工程学报》2017年04期 　论文类型：期刊论文

【摘要】：提出一种采用无损有源箝位辅助电路的移相脉宽调制(phase shifted pulse width modulation,PSPWM)高频链DC-AC变换器。相比于当前的两级逆变技术,该变换器实现了单级功率变换,省去了两级逆变器中的DC-DC变换器,减小了变换器复杂度。该变换器采用双极性PSPWM调制,输出电压的总谐波失真(total harmonic distortion,THD)较低。在目前技术中,双向开关管在双极性调制下较难实现软开关。提出一种无损有源箝位电路,箝位变压器和双向开关管两端电压,实现了双向开关管的软开关,提高了变换器效率。分析该变换器的调制方法、工作模态及变换器软开关过程,通过搭建一台200W的实验样机,验证理论分析的正确性。实验结果显示,提出的变换器的峰值效率可达92.25%,输出电压THD在0.02~20k Hz宽范围内均低于0.22%。
[Abstract]:A phase-shifted pulse-width modulation phase shifted pulse width modulation using lossless active clamp auxiliary circuit is proposed. Compared with the current two-stage inverter, this converter realizes single-stage power conversion and saves the DC-DC converter from the two-stage inverter. The complexity of the converter is reduced. The converter adopts bipolar PSPWM modulation and the total harmonic distortion of the output voltage is less than total harmonic distortion. The THD is relatively low. In the present technology, it is difficult to realize soft switching in bidirectional switch. A lossless active clamp circuit, clamping transformer and bidirectional switch voltage are proposed. The soft switch of bi-directional switch is realized, and the efficiency of converter is improved. The modulation method, working mode and soft switching process of the converter are analyzed, and a 200W experimental prototype is built. The experimental results show that the peak efficiency of the proposed converter can reach 92.25 and the output voltage THD is lower than 0.22 in the wide range of 0.02 ~ 20kHz.
【作者单位】：磁浮技术与磁浮列车教育部重点实验室西南交通大学电气工程学院;广东锐顶电力技术有限公司;
【分类号】：TM46
【正文快照】： 开关。提出一种无损有源箝位电路,箝位变压器和双向开关管两端电压,实现了双向开关管的软开关,提高了变换器效率。分析该变换器的调制方法、工作模态及变换器软开关过程,通过搭建一台200W的实验样机,验证理论分析的正确性。实验结果显示,提出的变换器的峰值效率可达92.25%,输

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