Patents by Inventor Dehong Xu
Dehong Xu 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: 20230387813Abstract: An isolated DC-DC converter including n conversion circuit units is provided. In each conversion circuit unit, a first connection node is formed between two switching components of a first primary bridge arm, and a second connection node is formed between two electronic components of a second primary bridge arm. A third connection node is formed between two switching components of a first secondary bridge arm, and a fourth connection node is formed between two switching components of a second secondary bridge arm. A first coupling inductor and A first capacitor are serially coupled between the first and third connection nodes. A second coupling inductor and a second capacitor are serially coupled between the second and fourth connection nodes. In the n conversion circuit units, the primary circuit units are electrically connected in series or in parallel, and the secondary circuit units are electrically connected in parallel or in series correspondingly.Type: ApplicationFiled: April 24, 2023Publication date: November 30, 2023Inventors: Kai Dong, Wenxing Zhong, Yuesen Guo, Hui Wang, Jinfa Zhang, Dehong Xu
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Patent number: 11601020Abstract: Disclosed in the present application is an incompletely compensated wireless power transfer system. On the basis of an SS compensated wireless power transfer system topology, a primary side capacitor C1 and a secondary side capacitor C2 take specific values, and in combination with a phase shift frequency modulation control method, a coupling range of a system output rated power is improved. According to the present application, by finding an appropriate combination of the primary side capacitor C1 and the secondary side capacitor C2, the system can output a required rated power in a larger coupling range under the condition of incomplete compensation.Type: GrantFiled: October 18, 2019Date of Patent: March 7, 2023Assignee: Zhejiang UniversityInventors: Wenxing Zhong, Dehong Xu
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Patent number: 11462994Abstract: A control method for a power factor correction circuit is disclosed. The power factor correction circuit includes a first bridge arm, a second bridge arm, an output capacitor and an active clamp unit. The control method includes steps of providing a first driving waveform to control a main switch, providing a second driving waveform to control an auxiliary switch, and providing a third driving signal to control a fifth switch. A first delay time is between the turning-off time point of the third driving signal and the turning-on time point of the first driving waveform, a second delay time is between the turning-on time point of the first driving waveform and the turning-off time point of the second driving waveform, and a third delay time is between the turning-off time point of the second driving waveform and the turning-on time point of the third driving signal.Type: GrantFiled: January 20, 2021Date of Patent: October 4, 2022Assignees: DELTA ELECTRONICS (SHANGHAI) CO., LTD., ZHEJIANG UNIVERSITYInventors: Kai Dong, Dehong Xu, Jinfa Zhang
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Publication number: 20220278563Abstract: Disclosed in the present application is an incompletely compensated wireless power transfer system. On the basis of an SS compensated wireless power transfer system topology, a primary side capacitor C1 and a secondary side capacitor C2 take specific values, and in combination with a phase shift frequency modulation control method, a coupling range of a system output rated power is improved. According to the present application, by finding an appropriate combination of the primary side capacitor C1 and the secondary side capacitor C2, the system can output a required rated power in a larger coupling range under the condition of incomplete compensation.Type: ApplicationFiled: October 18, 2019Publication date: September 1, 2022Inventors: Wenxing Zhong, Dehong Xu
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Patent number: 11411436Abstract: Disclose is a wireless electric energy transmission system for realizing PFC through secondary side modulation. According to the system, on the basis of a traditional wireless charging system topology, a traditional PFC circuit is removed, a grid voltage is turned into a 100 Hz voltage through uncontrolled rectification to directly supply power to an inverter of a primary side of a wireless charging system; an active full-bridge rectifying structure is adopted at a secondary side, and the PFC function is achieved only through secondary side modulation, wherein under the situation that a phase shift angle ? of the inverter of the primary side is given.Type: GrantFiled: November 25, 2021Date of Patent: August 9, 2022Assignee: ZHEJIANG UNIVERSITYInventors: Wenxing Zhong, Hao Li, Dehong Xu
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Publication number: 20220085657Abstract: Disclose is a wireless electric energy transmission system for realizing PFC through secondary side modulation. According to the system, on the basis of a traditional wireless charging system topology, a traditional PFC circuit is removed, a grid voltage is turned into a 100 Hz voltage through uncontrolled rectification to directly supply power to an inverter of a primary side of a wireless charging system; an active full-bridge rectifying structure is adopted at a secondary side, and the PFC function is achieved only through secondary side modulation, wherein under the situation that a phase shift angle ? of the inverter of the primary side is given.Type: ApplicationFiled: November 25, 2021Publication date: March 17, 2022Inventors: Wenxing ZHONG, Hao LI, Dehong XU
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Patent number: 11251698Abstract: A power factor correction circuit includes an input power source, a first bridge arm, a second bridge arm, an output capacitor and an active clamp unit. The first bridge arm includes a first switch and a second switch in series. The second bridge arm includes a third switch and a fourth switch in series. The active clamp unit includes a second inductor, a clamp capacitor and a fifth switch. The power factor correction circuit may realize the ZVS function of the first switch and the second switch by the collaboration of the active clamp unit and the conduction/non-conducting state of the first switch, the second switch, the third switch and the fourth switch.Type: GrantFiled: January 20, 2021Date of Patent: February 15, 2022Assignees: DELTA ELECTRONICS (SHANGHAI) CO., LTD., ZHEJIANG UNIVERSITYInventors: Dehong Xu, Kai Dong, Jinfa Zhang
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Publication number: 20220021296Abstract: A control method for a power factor correction circuit is disclosed. The power factor correction circuit includes a first bridge arm, a second bridge arm, an output capacitor and an active clamp unit. The control method includes steps of providing a first driving waveform to control a main switch, providing a second driving waveform to control an auxiliary switch, and providing a third driving signal to control a fifth switch. A first delay time is between the turning-off time point of the third driving signal and the turning-on time point of the first driving waveform, a second delay time is between the turning-on time point of the first driving waveform and the turning-off time point of the second driving waveform, and a third delay time is between the turning-off time point of the second driving waveform and the turning-on time point of the third driving signal.Type: ApplicationFiled: January 20, 2021Publication date: January 20, 2022Inventors: Kai Dong, Dehong Xu, Jinfa Zhang
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Publication number: 20220021297Abstract: A power factor correction circuit includes an input power source, a first bridge arm, a second bridge arm, an output capacitor and an active clamp unit. The first bridge arm includes a first switch and a second switch in series. The second bridge arm includes a third switch and a fourth switch in series. The active clamp unit includes a second inductor, a clamp capacitor and a fifth switch. The power factor correction circuit may realize the ZVS function of the first switch and the second switch by the collaboration of the active clamp unit and the conduction/non-conducting state of the first switch, the second switch, the third switch and the fourth switch.Type: ApplicationFiled: January 20, 2021Publication date: January 20, 2022Inventors: Dehong Xu, Kai Dong, Jinfa Zhang
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Patent number: 8183966Abstract: An entirely integrated EMI filter is based on a flexible multi-layer strip material. An EE or EI core comprises two side pillars and one middle pillar and forms a closed magnetic circuit. The middle pillar has an air gap. A first winding and a second winding respectively are wound around the two side pillars in a same winding direction. The middle pillar is wound with a third winding and a fourth winding, or with only a fifth winding. Passive components (e.g., all passive components) of the EMI filter are integrated into one core so that in its differential mode, insertion loss is significantly reduced, the size and volume are reduced, and the distribution constant of the EMI filter has less impact on the filter's performance.Type: GrantFiled: March 29, 2010Date of Patent: May 22, 2012Assignee: Fuji Electric Co., Ltd.Inventors: Dehong Xu, Zhiwei Wen, Xiaofeng Wu, Yasuhiro Okuma, Kazuaki Mino
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Patent number: 7999633Abstract: An integrated structure of common-mode inductors and differential-mode capacitors in an EMI filter realized using a flexible circuit board, including: a closed magnetic circuit formed by a first magnetic core and a second magnetic core, optionally including an air gap formed in a middle pillar of the magnetic cores, and with a flexible printed circuit board (FPC) wound on at least one pillar, the FPC formed by laminating alternating insulating and copper foil layers. The integrated structure of inductors and capacitors is advantageous in reducing the volume of the EMI filter and improving the power density of an electronic power transformer.Type: GrantFiled: November 6, 2008Date of Patent: August 16, 2011Assignees: Fuji Electric Systems Co., Ltd., Zhe Jiang UniversityInventors: Dehong Xu, Xiao-feng Wu, Yanjun Zhang, Yi Chen, Yasuhiro Okuma, Kazuaki Mino
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Publication number: 20100245008Abstract: An entirely integrated EMI filter is based on a flexible multi-layer strip material. An EE or EI core comprises two side pillars and one middle pillar and forms a closed magnetic circuit. The middle pillar has an air gap. A first winding and a second winding respectively are wound around the two side pillars in a same winding direction. The middle pillar is wound with a third winding and a fourth winding, or with only a fifth winding. Passive components (e.g., all passive components) of the EMI filter are integrated into one core so that in its differential mode, insertion loss is significantly reduced, the size and volume are reduced, and the distribution constant of the EMI filter has less impact on the filter's performance.Type: ApplicationFiled: March 29, 2010Publication date: September 30, 2010Applicants: ZHE JIANG UNIVERSITY, FUJI ELECTRIC SYSTEMS CO., LTD.Inventors: Dehong XU, Zhiwei Wen, Xiaofeng Wu, Yasuhiro Okuma, Kazuaki Mino
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Patent number: 7671713Abstract: An integrated structure of passive elements in an LLC resonance converter realized by flexible circuit boards includes a closed magnetic circuit formed by first and second magnetic cores, a tubular, double-sided, flexible circuit board, tubular magnetic-material layer and tubular, single-sided, flexible circuit board. The single-sided circuit board is coaxially sleeved in turn from inside outwards on a magnetic core column of the closed magnetic circuit. The tubular, double-sided, circuit board is a laminated plate material formed in turn of a first insulating layer, first copper foil, insulating medium layer, second copper foil and second insulating layer. The tubular, single-sided, circuit board is a laminated plate material formed in turn of a third insulating layer, third copper foil and fourth insulating layer. The integration of a resonance capacitor, resonance inductor, shunt inductor and transformer in a LLC resonance converter is realized by using these flexible circuit boards.Type: GrantFiled: February 4, 2008Date of Patent: March 2, 2010Assignees: Zhe Jiang University, Fuji Electric Systems Co., Ltd.Inventors: Dehong Xu, Yanjun Zhang, Yi Chen, Kazuaki Mino
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Publication number: 20090128258Abstract: An integrated structure of common-mode inductors and differential-mode capacitors in an EMI filter realized using a flexible circuit board, including: a closed magnetic circuit formed by a first magnetic core and a second magnetic core, optionally including an air gap formed in a middle pillar of the magnetic cores, and with a flexible printed circuit board (FPC) wound on at least one pillar, the FPC formed by laminating alternating insulating and copper foil layers. The integrated structure of inductors and capacitors is advantageous in reducing the volume of the EMI filter and improving the power density of an electronic power transformer.Type: ApplicationFiled: November 6, 2008Publication date: May 21, 2009Applicants: ZHE JIANG UNIVERSITY, FUJI ELECTRIC SYSTEMS CO., LTD.Inventors: Dehong Xu, Xiao-feng Wu, Yanjun Zhang, Yi Chen, Yasuhiro Okuma, Kazuaki Mino
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Publication number: 20080224809Abstract: A magnetic part having a first iron core wound with a winding constituting a transformer and an inductance component of a parallel coil and a second iron core wound with an inductance component of a series coil, in which a ratio of the dimensions of the first iron core and the second iron core are in accordance with their respective winding densities.Type: ApplicationFiled: February 19, 2008Publication date: September 18, 2008Applicants: ZHE JIANG UNIVERSITY, FUJI ELECTRIC SYSTEMS CO., LTD.Inventors: Yanjun ZHANG, Dehong Xu, Kazuaki Mino, Kiyoaki Sasagawa
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Publication number: 20080186122Abstract: An integrated structure of passive elements in an LLC resonance converter realized by flexible circuit boards includes a closed magnetic circuit formed by first and second magnetic cores, a tubular, double-sided, flexible circuit board, tubular magnetic-material layer and tubular, single-sided, flexible circuit board. The single-sided circuit board is coaxially sleeved in turn from inside outwards on a magnetic core column of the closed magnetic circuit. The tubular, double-sided, circuit board is a laminated plate material formed in turn of a first insulating layer, first copper foil, insulating medium layer, second copper foil and second insulating layer. The tubular, single-sided, circuit board is a laminated plate material formed in turn of a third insulating layer, third copper foil and fourth insulating layer. The integration of a resonance capacitor, resonance inductor, shunt inductor and transformer in a LLC resonance converter is realized by using these flexible circuit boards.Type: ApplicationFiled: February 4, 2008Publication date: August 7, 2008Applicants: ZHE JIANG UNIVERSITY, FUJI ELECTRIC SYSTEMS CO., LTD.Inventors: Dehong Xu, Yanjun Zhang, Yi Chen, Kazuaki Mino