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更新时间:2024.04.27
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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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.

空间矢量调制技术使防爆电机保持“凉爽”

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2003年,著名的ATEX防爆指令在欧洲得到广泛推行(2003年6月30日,著名的欧州ATEX防爆指令94/9/EC已进入强制执行阶段。该指令规定了爆炸性环境下使用的电气及非电气设备必须履行ATEX防爆检验程序,并通过CE认证后才能投放欧洲市场),其重要原因之一是制造业各部门危险区域的不断增加。最近一项评估结果显示,约50%的工业部门存在至少一块某种类型的危险区域。

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