Patents by Inventor Dehai LOU
Dehai LOU has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230216423Abstract: A power converter includes a PCB having opposing first and second sides, and a plurality of first commutation units and first capacitor unit disposed on the PCB. Each first commutation unit includes a first discrete component and a second discrete component. The second end of the first discrete component is electrically coupled to the first end of the second discrete component, and the first capacitor unit is electrically coupled to the first ends of the first discrete components and the second ends of the second discrete components in the plurality of first commutation units, respectively. The first discrete components and the second discrete components in the plurality of first commutation units are arranged in a row. The first discrete component and the second discrete component in each first commutation unit form a commutation loop together with the first capacitor unit.Type: ApplicationFiled: December 21, 2022Publication date: July 6, 2023Applicant: Delta Electronics (Shanghai) CO., LTDInventors: Lifeng QIAO, Dehai LOU, Teng LIU, Jianping YING, Zhiqiang DAI
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Patent number: 11658580Abstract: The present disclosure provides a control method for a DC converter and a DC converter. the DC converter comprises a switching circuit, a sampling circuit, and a controller, the method comprising: acquiring a duty ratio of a Burst cycle according to an output reference signal and an output signal; acquiring a first number of switching cycles and a burst on time according to the duty ratio of the Burst cycle, a first preset value, and a switching period of the switching device; acquiring a Burst cycle value according to the burst on time and the duty ratio of the Burst cycle; and generating a driving signal according to the Burst cycle value, the first number of switching cycles, and the switching period.Type: GrantFiled: May 11, 2021Date of Patent: May 23, 2023Assignee: Delta Electronics (Shanghai) CO., LTDInventors: Pian Zhou, Teng Liu, Dehai Lou, Hongwei Xiao, Yi Zhang
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Publication number: 20230073099Abstract: 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.Type: ApplicationFiled: August 31, 2022Publication date: March 9, 2023Inventors: Dehai Lou, Pian Zhou, Xin Wang, Teng Liu
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Patent number: 11515777Abstract: 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.Type: GrantFiled: September 2, 2021Date of Patent: November 29, 2022Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Xin Wang, Dehai Lou, Lifeng Qiao, Teng Liu, Weibo Qin
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Patent number: 11394292Abstract: A power unit includes: a DC/DC conversion circuit; a bypass circuit, including a mechanical switch, an impedance network, and a semiconductor switch, wherein the semiconductor switch and the impedance network are connected in series to form a series branch, the series branch, the mechanic switch and the DC/DC conversion circuit are connected in parallel between a positive end and a negative end at one side of the power unit; a detecting unit, configured to detect a working signal of the DC/DC conversion circuit and generate a detection signal according to the working signal; and a controller, configured to, when the fault occurs in the DC/DC conversion circuit, output a first control signal to a control end of the mechanical switch and output a second control signal to a control end of the semiconductor switch.Type: GrantFiled: March 26, 2020Date of Patent: July 19, 2022Assignee: Delta Electronics (Shanghai) CO., LTDInventors: Jianping Ying, Teng Liu, Dehai Lou, Xin Wang, Yun Cao
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Publication number: 20220094257Abstract: 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.Type: ApplicationFiled: September 2, 2021Publication date: March 24, 2022Inventors: Xin Wang, Dehai Lou, Lifeng Qiao, Teng Liu, Weibo Qin
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Patent number: 11217993Abstract: 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.Type: GrantFiled: March 26, 2020Date of Patent: January 4, 2022Assignee: Delta Electronics (Shanghai) CO., LTDInventors: Teng Liu, Jianping Ying, Yi Zhang, Guangcheng Hu, Xin Wang, Dehai Lou, Yun Cao
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Publication number: 20210359611Abstract: The present disclosure provides a control method for a DC converter and a DC converter. the DC converter comprises a switching circuit, a sampling circuit, and a controller, the method comprising: acquiring a duty ratio of a Burst cycle according to an output reference signal and an output signal; acquiring a first number of switching cycles and a burst on time according to the duty ratio of the Burst cycle, a first preset value, and a switching period of the switching device; acquiring a Burst cycle value according to the burst on time and the duty ratio of the Burst cycle; and generating a driving signal according to the Burst cycle value, the first number of switching cycles, and the switching period.Type: ApplicationFiled: May 11, 2021Publication date: November 18, 2021Applicant: Delta Electronics (Shanghai) CO., LTDInventors: Pian ZHOU, Teng LIU, Dehai LOU, Hongwei XIAO, Yi ZHANG
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Publication number: 20200313544Abstract: A power unit includes: a DC/DC conversion circuit; a bypass circuit, including a mechanical switch, an impedance network, and a semiconductor switch, wherein the semiconductor switch and the impedance network are connected in series to form a series branch, the series branch, the mechanic switch and the DC/DC conversion circuit are connected in parallel between a positive end and a negative end at one side of the power unit; a detecting unit, configured to detect a working signal of the DC/DC conversion circuit and generate a detection signal according to the working signal; and a controller, configured to, when the fault occurs in the DC/DC conversion circuit, output a first control signal to a control end of the mechanical switch and output a second control signal to a control end of the semiconductor switch.Type: ApplicationFiled: March 26, 2020Publication date: October 1, 2020Applicant: Delta Electronics (Shanghai) CO., LTDInventors: Jianping YING, Teng LIU, Dehai LOU, Xin WANG, Yun CAO
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Publication number: 20200313554Abstract: 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.Type: ApplicationFiled: March 26, 2020Publication date: October 1, 2020Applicant: Delta Electronics (Shanghai) CO., LTDInventors: Teng LIU, Jianping YING, Yi ZHANG, Guangcheng HU, Xin WANG, Dehai LOU, Yun CAO