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更新时间:2025.02.22
有源箝位零电压开关三相PFC变换器及其零电压开关-空间矢量调制策略

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大小:774KB

页数: 9页

In three-phase PFC converter,there exist severe switch anti-parallel diode reverse recovery problems.The effective measures of Compound Active-clamping and Minimum Voltage Active-clamping techniques in single phase PFC are extended to three-phase PFC.A family of Active-clamping ZVS soft switching PFC converter is got. They can effectively suppress the diode reverse recovery, and realize ZVS for all the switches. In order to reduce the number of the auxiliary switches, A ZVS space vector modulation (ZVS-SVM)is proposed. It uses only one auxiliary switch and can realize ZVS for all the switches. The switching frequency of the main switch and the auxiliary switch is fixed, thus the input current waveform is good.The theory has been illustrated by the compound active-clamp (CAC) three phase PFC. One DSP controlled 4kW PFC converter prototype with CAC is implemented.

移相控制零电压开关三电平弧焊电源研究

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大小:731KB

页数: 3页

提出了一种新颖的移相控制零电压开关三电平变换器,分析了该变换器的工作原理,并给出了移相控制电路和驱动电路。最后利用该变换器研制出一最大输出为120A的弧焊电源,并给出了试验波形和电源的实测外特性波形。

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