An Interleaved Three-Phase PWM Single-Stage Resonant Rectifier With High-Frequency Isolation
An Interleaved Three-Phase PWM Single-Stage Resonant Rectifier With High-Frequency Isolation
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DOI：
10.1109/tie.2019.2938461
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发表时间：
2020-08
影响因子：
7.7
通讯作者：
Guangdi Li;Jie Ruan-;Kun Wang;Yan Deng;Xiangning He;Yousheng Wang
中科院分区：
文献类型：
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作者：
Guangdi Li;Jie Ruan-;Kun Wang;Yan Deng;Xiangning He;Yousheng Wang
提出了一种新型交错并联高频隔离三相脉宽调制单级谐振交流变换器。该变换器由一个交错并联的三相功率因数校正（PFC）半级和一个三相LLC谐振DC-DC半级组成。该变换器的功率开关管实现了软开关换流，包括原边功率开关管的零电压开通和副边二极管的零电流关断。DC-DC半级中的LLC谐振回路用作带通滤波器，可衰减线路频率涟漪并保持开关频率分量通过Transformer。高频Transformer体积小。提出了谐振型DC-DC半级PWM控制的稳态分析方法，分析了其直流侧电压应力。此外，直流链路电容值可以大大降低，而不会影响PFC操作。一个原型，将一个广泛的三相输入电压到300 V直流输出电压的建立和测试。实验结果表明，在满载条件下，功率因数几乎为1，转换效率高达96.3%，总谐波失真低至3.86%。
This article proposes a novel interleaved three-phase pulsewidth modulation (PWM) single-stage resonant ac–dc converter with high-frequency isolation. The proposed converter comes from an interleaved three-phase power factor correction (PFC) semistage and a three-phase LLC resonant dc–dc semistage. Soft-switching commutation can be achieved on the power switches in this converter including zero-voltage-switching-on on the primary side power switches and zero-current-switching-off on the secondary diodes. The LLC resonant tank in the dc–dc semistage serves as a bandpass filter that attenuates the line-frequency ripple and keeps the switching frequency component passing through the transformer. The high frequency transformer keeps in a small size. Steady-state analysis of the resonant dc–dc semistage for PWM control is proposed to analyze the dc-link voltage stress. Moreover, the dc-link capacitor value can be greatly reduced without affecting the PFC operation. A prototype that converts a wide three-phase input voltage to 300 V dc output voltage is built and tested. The experimental results present an almost unity power factor with a conversion efficiency as high as 96.3% with total harmonic distortion as low as 3.86% at a full-load condition.