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公开(公告)号：US11515777B2
公开(公告)日：2022-11-29
申请号：US17465434
申请日：2021-09-02
发明人： Xin Wang , Dehai Lou , Lifeng Qiao , Teng Liu , Weibo Qin
摘要： A cascaded conversion system and a voltage equalizing control method thereof are provided. The cascaded conversion system includes a plurality of conversion circuits connected in cascade. Each conversion circuit includes a DC-side capacitor, a switching unit and a control unit. The DC-side capacitors of the conversion circuits are electrically connected in series. In each conversion circuit, the switching unit is connected to the DC-side capacitor in parallel and includes a plurality of bridge arms. Each bridge arm includes a first switch and a second switch. The control unit controls the switches according to the voltage across the DC-side capacitor. The control unit controls the first and second switches to be turned on alternately. All the first switches are turned on and off simultaneously, and all the second switches are turned on and off simultaneously, thereby making the voltages across the DC-side capacitors of the conversion circuits equal.
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公开(公告)号：US12003192B2
公开(公告)日：2024-06-04
申请号：US17684382
申请日：2022-03-01
发明人： Lifeng Qiao , Yong Zeng , Teng Liu , Weibo Qin
摘要： The invention provides a converter and a method for suppressing loop interference of converter. The converter includes first and second switching sets connected to each other. Each switching set includes a plurality of switching devices. The plurality of second switching devices are configured to be turned on for a first time after the turn-off time of the plurality of first switching devices, such that each of the plurality of second switching devices provides a path for current within the first time to reduce a potential difference between the first end of at least one of the plurality of second switching devices and the first end of the remaining of the plurality of second switching devices.
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公开(公告)号：US20220094257A1
公开(公告)日：2022-03-24
申请号：US17465434
申请日：2021-09-02
发明人： Xin Wang , Dehai Lou , Lifeng Qiao , Teng Liu , Weibo Qin
摘要： A cascaded conversion system and a voltage equalizing control method thereof are provided. The cascaded conversion system includes a plurality of conversion circuits connected in cascade. Each conversion circuit includes a DC-side capacitor, a switching unit and a control unit. The DC-side capacitors of the conversion circuits are electrically connected in series. In each conversion circuit, the switching unit is connected to the DC-side capacitor in parallel and includes a plurality of bridge arms. Each bridge arm includes a first switch and a second switch. The control unit controls the switches according to the voltage across the DC-side capacitor. The control unit controls the first and second switches to be turned on alternately. All the first switches are turned on and off simultaneously, and all the second switches are turned on and off simultaneously, thereby making the voltages across the DC-side capacitors of the conversion circuits equal.
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