Patents by Inventor Wenxing Zhong
Wenxing Zhong 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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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: 10566133Abstract: The present invention provides an apparatus for wireless power transfer including three or more coils, each coil defining a respective coil plane, and the coils being arranged in one or more power flow paths whereby each coil can be magnetically coupled to one or more of the other coils thereby to wirelessly transfer power along the one or more power flow paths. The present invention also provides a method for wirelessly transferring power, the method including: providing three or more coils, each coil defining a respective coil plane; and arranging the coils in one or more power flow paths whereby each coil can be magnetically coupled to one or more of the other coils thereby to wirelessly transfer power along the one or more power flow paths.Type: GrantFiled: January 14, 2011Date of Patent: February 18, 2020Assignee: CITY UNIVERSITY OF HONG KONGInventors: Ron Shu Yuen Hui, Wenxing Zhong
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Patent number: 10305331Abstract: Wireless power transfer systems and methods are provided. No wireless communication system is necessary feedback output information from the receiver side to the transmitter side. Nor is any knowledge of the mutual coupling or mutual inductance between the transmitter side and the receiver side required. A system can include an intermediate capacitor in the receiver circuit as a power flow indicator and hysteresis on-off switching actions of a decoupling power switch in the receiver circuit to regulate the DC voltage of the intermediate capacitor (for voltage-control) and the load current (for current-control) at a rated value within a narrow tolerance band. The turn-on and turn-off times of the decoupling switch in the receiver circuit can be detected in the transmitter circuit from, for example, the primary winding current or voltage. This can be used to meet the power demand in the receiver circuit dynamically.Type: GrantFiled: April 30, 2015Date of Patent: May 28, 2019Assignee: The University of Hong KongInventors: Wenxing Zhong, Shu Yuen Hui
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Patent number: 10256742Abstract: Systems, methods, and devices that employ self-driven gate-drive circuitry to facilitate controlling power switches to emulate a diode bridge to synchronously rectify a power signal are presented. A single-phase or multi-phase synchronous rectifier can comprise at least a first pair of switches of a first conducting path and a second pair of switches of a second conducting path that can form or emulate a diode bridge. To facilitate emulating turn-on and turn-off conditions of a diode, a switch can be turned on when voltage across the switch is forward-biased and turned off when switch current is reversed; also, there can be at least one current-controlled switch in each conducting path. Self-driven gate-drive circuitry employs low power components that can facilitate controlling respective switching of the at least first pair and second pair of switches, wherein switching of the switches is also controlled at start-up to emulate a diode bridge.Type: GrantFiled: March 3, 2017Date of Patent: April 9, 2019Assignee: CITY UNIVERSITY OF HONG KONGInventors: Shu Yuen Ron Hui, Wenxing Zhong, Ho Wing Choi
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Publication number: 20180294672Abstract: Wireless power transfer systems and methods are provided. No wireless communication system is necessary feedback output information from the receiver side to the transmitter side. Nor is any knowledge of the mutual coupling or mutual inductance between the transmitter side and the receiver side required. A system can include an intermediate capacitor in the receiver circuit as a power flow indicator and hysteresis on-off switching actions of a decoupling power switch in the receiver circuit to regulate the DC voltage of the intermediate capacitor (for voltage-control) and the load current (for current-control) at a rated value within a narrow tolerance band. The turn-on and turn-off times of the decoupling switch in the receiver circuit can be detected in the transmitter circuit from, for example, the primary winding current or voltage. This can be used to meet the power demand in the receiver circuit dynamically.Type: ApplicationFiled: April 30, 2015Publication date: October 11, 2018Inventors: Wenxing Zhong, Shu Yuen Hui
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Patent number: 9787102Abstract: This invention is related to a novel method and apparatus that provides selective and enhanced power flow in wireless power transfer systems with multiple receivers. Auxiliary circuits are introduced in the receiver circuits (and relay circuits if applicable) so as to ensure proper frequency-selective wireless power flow to the appropriate targeted receivers, with the pickup power by the non-targeted receivers substantially reduced even if the chosen tuned frequencies for different receivers are not widely apart.Type: GrantFiled: February 12, 2014Date of Patent: October 10, 2017Assignee: THE UNIVERSITY OF HONG KONGInventors: Wenxing Zhong, Shu Yuen Ron Hui
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Publication number: 20170179846Abstract: Systems, methods, and devices that employ self-driven gate-drive circuitry to facilitate controlling power switches to emulate a diode bridge to synchronously rectify a power signal are presented. A single-phase or multi-phase synchronous rectifier can comprise at least a first pair of switches of a first conducting path and a second pair of switches of a second conducting path that can form or emulate a diode bridge. To facilitate emulating turn-on and turn-off conditions of a diode, a switch can be turned on when voltage across the switch is forward-biased and turned off when switch current is reversed; also, there can be at least one current-controlled switch in each conducting path. Self-driven gate-drive circuitry employs low power components that can facilitate controlling respective switching of the at least first pair and second pair of switches, wherein switching of the switches is also controlled at start-up to emulate a diode bridge.Type: ApplicationFiled: March 3, 2017Publication date: June 22, 2017Inventors: Shu Yuen Ron Hui, Wenxing Zhong, Ho Wing Choi
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Patent number: 9590523Abstract: Systems, methods, and devices that employ self-driven gate-drive circuitry to facilitate controlling power switches to emulate a diode bridge to synchronously rectify a power signal are presented. A single-phase or multi-phase synchronous rectifier can comprise at least a first pair of switches of a first conducting path and a second pair of switches of a second conducting path that can form or emulate a diode bridge. To facilitate emulating turn-on and turn-off conditions of a diode, a switch can be turned on when voltage across the switch is forward-biased and turned off when switch current is reversed; also, there can be at least one current-controlled switch in each conducting path. Self-driven gate-drive circuitry employs low power components that can facilitate controlling respective switching of the at least first pair and second pair of switches, wherein switching of the switches is also controlled at start-up to emulate a diode bridge.Type: GrantFiled: October 17, 2014Date of Patent: March 7, 2017Assignee: CITY UNIVERSITY OF HONG KONGInventors: Shu Yuen Ron Hui, Wenxing Zhong, Ho Wing Choi
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Publication number: 20150228402Abstract: This invention is related to a novel method and apparatus that provides selective and enhanced power flow in wireless power transfer systems with multiple receivers. Auxiliary circuits are introduced in the receiver circuits (and relay circuits if applicable) so as to ensure proper frequency-selective wireless power flow to the appropriate targeted receivers, with the pickup power by the non-targeted receivers substantially reduced even if the chosen tuned frequencies for different receivers are not widely apart.Type: ApplicationFiled: February 12, 2014Publication date: August 13, 2015Applicant: THE UNIVERSITY OF HONG KONGInventors: Wenxing ZHONG, Shu Yuen Ron HUI
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Publication number: 20150085547Abstract: Systems, methods, and devices that employ self-driven gate-drive circuitry to facilitate controlling power switches to emulate a diode bridge to synchronously rectify a power signal are presented. A single-phase or multi-phase synchronous rectifier can comprise at least a first pair of switches of a first conducting path and a second pair of switches of a second conducting path that can form or emulate a diode bridge. To facilitate emulating turn-on and turn-off conditions of a diode, a switch can be turned on when voltage across the switch is forward-biased and turned off when switch current is reversed; also, there can be at least one current-controlled switch in each conducting path. Self-driven gate-drive circuitry employs low power components that can facilitate controlling respective switching of the at least first pair and second pair of switches, wherein switching of the switches is also controlled at start-up to emulate a diode bridge.Type: ApplicationFiled: October 17, 2014Publication date: March 26, 2015Inventors: Shu Yuen Ron Hui, Wenxing Zhong, Ho Wing Choi
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Patent number: 8913409Abstract: Systems, methods, and devices that employ self-driven gate-drive circuitry to facilitate controlling power switches to emulate a diode bridge to synchronously rectify a power signal are presented. A single-phase or multi-phase synchronous rectifier can comprise at least a first pair of switches of a first conducting path and a second pair of switches of a second conducting path that can form or emulate a diode bridge. To facilitate emulating turn-on and turn-off conditions of a diode, a switch can be turned on when voltage across the switch is forward-biased and turned off when switch current is reversed; also, there can be at least one current-controlled switch in each conducting path. Self-driven gate-drive circuitry employs low power components that can facilitate controlling respective switching of the at least first pair and second pair of switches, wherein switching of the switches is also controlled at start-up to emulate a diode bridge.Type: GrantFiled: October 6, 2010Date of Patent: December 16, 2014Assignee: City University of Hong KongInventors: Shu Yuen Ron Hui, Wenxing Zhong, Ho Wing Choi
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Patent number: 8829884Abstract: The present invention provides a current balancing circuit and method for balancing the respective currents in a plurality of parallel circuit branches in a target circuit. The current balancing circuit including: a plurality of balancing transistors, each having a collector, an emitter, and a base, the collector and emitter of each balancing transistor connected in series with a respective circuit branch; and a selection circuit for selectively connecting the circuit branch having the smallest current amongst the circuit branches to the bases of each balancing transistor.Type: GrantFiled: January 12, 2011Date of Patent: September 9, 2014Inventors: Wenxing Zhong, Sinan Li, Wu Chen, Shu Yuen Ron Hui
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Publication number: 20140028112Abstract: The present invention provides an apparatus for wireless power transfer including three or more coils, each coil defining a respective coil plane, and the coils being arranged in one or more power flow paths whereby each coil can be magnetically coupled to one or more of the other coils thereby to wirelessly transfer power along the one or more power flow paths. The present invention also provides a method for wirelessly transferring power, the method including: providing three or more coils, each coil defining a respective coil plane; and arranging the coils in one or more power flow paths whereby each coil can be magnetically coupled to one or more of the other coils thereby to wirelessly transfer power along the one or more power flow paths.Type: ApplicationFiled: January 14, 2011Publication date: January 30, 2014Applicant: CITY UNIVERSITY OF HONG KONGInventors: Ron Shu Yuen Hui, Wenxing Zhong
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Publication number: 20120286753Abstract: The present invention provides a current balancing circuit and method for balancing the respective currents in a plurality of parallel circuit branches in a target circuit. The current balancing circuit including: a plurality of balancing transistors, each having a collector, an emitter, and a base, the collector and emitter of each balancing transistor connected in series with a respective circuit branch; and a selection circuit for selectively connecting the circuit branch having the smallest current amongst the circuit branches to the bases of each balancing transistor.Type: ApplicationFiled: January 12, 2011Publication date: November 15, 2012Inventors: Wenxing Zhong, Sinan Li, Wu Chen, Shu Yuen Ron Hui
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Publication number: 20110199799Abstract: Systems, methods, and devices that employ self-driven gate-drive circuitry to facilitate controlling power switches to emulate a diode bridge to synchronously rectify a power signal are presented. A single-phase or multi-phase synchronous rectifier can comprise at least a first pair of switches of a first conducting path and a second pair of switches of a second conducting path that can form or emulate a diode bridge. To facilitate emulating turn-on and turn-off conditions of a diode, a switch can be turned on when voltage across the switch is forward-biased and turned off when switch current is reversed; also, there can be at least one current-controlled switch in each conducting path. Self-driven gate-drive circuitry employs low power components that can facilitate controlling respective switching of the at least first pair and second pair of switches, wherein switching of the switches is also controlled at start-up to emulate a diode bridge.Type: ApplicationFiled: October 6, 2010Publication date: August 18, 2011Applicant: CITY UNIVERSITY OF HONG KONGInventors: Shu Yuen Ron Hui, Wenxing Zhong, Ho Wing Choi