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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：US11217993B2
公开(公告)日：2022-01-04
申请号：US16830327
申请日：2020-03-26
发明人： Teng Liu , Jianping Ying , Yi Zhang , Guangcheng Hu , Xin Wang , Dehai Lou , Yun Cao
摘要： The present disclosure provides a conversion system with a high voltage side and a low voltage side, including: a plurality of power units, each power unit including: a plurality of DC/DC converters, when in normal operation, one part of DC/DC converters being in a working state and other DC/DC converters being in a cold backup state; a plurality of bypass circuits connected in parallel to the corresponding DC/DC converters; a detection unit connected to each DC/DC converter, and detects the DC/DC converter; and a control unit coupled to the detection unit and each of the plurality of DC/DC converters; and a main control unit coupled with each control unit and configured to receive the preset signal of respective control unit and outputs a bypass signal and a release signal to the corresponding control unit according to the preset signal.
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公开(公告)号：US11515806B2
公开(公告)日：2022-11-29
申请号：US17314663
申请日：2021-05-07
发明人： Teng Liu , Jianping Ying , Lifeng Qiao , Xin Wang , Hongwei Xiao
摘要： A conversion device includes: an inductor connected to the AC power grid; a first-stage converter configured to output a bus voltage based on the AC power grid; a second-stage converter configured to convert the bus voltage into an output voltage to the load; and a filtering network, wherein a first resistance-capacitance circuit is disposed between the first and third terminals of the filtering network, a second resistance-capacitance circuit is disposed between the second and third terminals of the filtering network, the first terminal of the filtering network is connected to the AC power grid, the second terminal of the filtering network is connected to the bus or the second terminal of the second-stage converter, and the third terminal of the filtering network is grounded through a first capacitor.
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4.发明授权公开(公告)号：US10367496B2
公开(公告)日：2019-07-30
申请号：US15910027
申请日：2018-03-02
发明人： Jianping Ying , Ming Wang , Xiaobo Huang , Jun Liu , Lifeng Qiao , Xin Wang
IPC分类号： H03K17/0812 , H03F1/52 , H03F3/213 , H03F3/217 , H03K17/082 , H03K17/10 , H03K17/16 , H03F3/21 , H01L29/866 , H01L29/739
摘要： The present disclosure discloses a gate voltage control circuit of an IGBT and a control method thereof. The gate voltage control circuit of the IGBT comprises a voltage control circuit, an active clamping circuit and a power amplifier circuit. A control voltage outputted by the voltage control circuit indirectly controls a gate voltage of the IGBT, so as to achieve a better control of the gate voltage of the IGBT with a smaller loss. It may prevent the active clamping circuit from a too-early response and may increase the active clamping circuit response speed; and may avoid the voltage oscillation of the collector-emitter voltage Vce and the gate voltage Vge, and may improve the reliability of the IGBTs connected in series.
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公开(公告)号：US11885844B2
公开(公告)日：2024-01-30
申请号：US17816730
申请日：2022-08-02
发明人： Jianxing Dong , Teng Liu , Xin Wang , Jianping Ying
CPC分类号： G01R31/1227 , G01R31/52 , H02M1/08
摘要： The disclosure discloses a method and device for detecting insulation state in a conversion system, wherein the conversion system includes an excitation source, a converter having an input end coupled to the excitation source, a connection element coupled between an output end of the converter and a reference point, and a coupling impedance having a first end coupled to the excitation source and a second end coupled to the reference point, the method for detecting insulation state including steps of: S1, controlling at least one main power switch of the converter not to switch; S2, detecting a pulse current signal of the connection element; and S3, processing the pulse current signal and outputting a partial discharge information, the partial discharge information indicating an insulation state of an isolating transformer in the converter. The disclosure can overcome electromagnetic interference of high frequency steep waves on a partial discharge signal.
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公开(公告)号：US10234880B1
公开(公告)日：2019-03-19
申请号：US16038184
申请日：2018-07-18
发明人： Wuying Li , Xin Wang , Lifeng Qiao , Chenyu Lai , Jianping Ying
摘要： The present disclosure discloses an active clamp circuit for a power semiconductor switch and a power converter using the same. The active clamp circuit includes: a discharging circuit, a first terminal of the discharging circuit being electrically connected to a collector of the power semiconductor switch; an unidirectional blocking circuit; a first voltage regulator diode connected in series with the unidirectional blocking circuit to form a series branch, a first terminal of the series branch being electrically connected to the collector of the power semiconductor switch; and a resistance-capacitance RC circuit, a first terminal of the RC circuit, a second terminal of the discharging circuit, and a second terminal of the serial circuit being electrically connected, a second terminal of the RC circuit being electrically coupled to a gate of the power semiconductor switch.
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公开(公告)号：US11509239B2
公开(公告)日：2022-11-22
申请号：US17314105
申请日：2021-05-07
发明人： Teng Liu , Jianping Ying , Lifeng Qiao , Xin Wang , Hongwei Xiao
摘要： A conversion device includes: an inductor electrically connected to the AC power grid; a first-stage converter configured to output a bus voltage according to the AC power grid, wherein the first-stage converter includes an N-level alternating current-direct current (AC-DC) converter, and the N-level AC-DC converter includes a plurality of switch bridge arms, wherein both an upper bridge arm and a lower bridge arm of each of the plurality of switch bridge arms of the N-level AC-DC converter include a plurality of semiconductor devices connected in series, and a rated withstand voltage Vsemi of each of the semiconductor devices is greater than or equal to (Vbus*δ)/((N−1)*Nseries*λ); and a second-stage converter configured to convert the bus voltage into an output voltage to supply energy to the load.
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公开(公告)号：US20230073099A1
公开(公告)日：2023-03-09
申请号：US17900505
申请日：2022-08-31
摘要： A power converter is provided. The power converter includes power units and local controller. Input terminals of the power units are connected to each other in series. Output terminals of the plurality of power units are connected to each other in parallel. The local controllers are electrically connected to the power units respectively. Each local controller controls an operation of switching devices in the corresponding power unit. Each local controller receives an input capacitor voltage on an input capacitor of the corresponding power unit, an input reference voltage and an output voltage of the power converter. In each power unit and the corresponding local controller, when an input difference between the input reference voltage and the input capacitor voltage is smaller than a first set value, the local controller controls a switching frequency of the switching devices in the corresponding power unit to jump to a preset frequency.
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公开(公告)号：US20220407433A1
公开(公告)日：2022-12-22
申请号：US17830150
申请日：2022-06-01
发明人： Teng Liu , Xin Wang , Liang Wang , Jianxing Dong
摘要： A power module of a medium-high-voltage isolated converter is disclosed. The power module includes a first circuit, a second circuit, a transformer and a shielding structure. A potential of the first circuit is greater than a potential of the second circuit. The transformer includes a first leading wire electrically connected to the first circuit, and a second leading wire electrically connected to the second circuit. The shielding structure is disposed between the transformer and the second circuit. The second leading wire is electrically connected between the transformer and the second circuit through the shielding structure, and the shielding structure is maintained at a constant potential.
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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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