Patents by Inventor Wensong Yu
Wensong Yu 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: 20220385081Abstract: Various examples are provided for high voltage isolation. The isolation can be provided for discrete non-isolated devices using an electrically isolating substrate that is thermally conductive. In one example, a module includes a plurality of switching devices connected in series; one or more rubber buffer disposed between switching device pairs of the plurality of switching devices; and thermal interfaces disposed between switching devices of the switching device pairs and cooling surfaces of the module, the thermal interfaces electrically isolating the switching devices from the cooling surface. In another example, an extreme fast charger (EFC) station includes an active front end (AFE) module that includes at least one module, where the module is a half-bridge power module. The EFC station can include a dual-active-bridge (DAB) high voltage (HV) module that includes at least one module, where the module is a half-bridge power module.Type: ApplicationFiled: May 31, 2022Publication date: December 1, 2022Inventors: Wensong Yu, Dakai Wang, Srdjan Miodrag Lukic
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Patent number: 11063534Abstract: Disclosed herein are methods, systems, and devices for providing power conversion between a direct current (DC) source and an alternating current (AC) power grid. According to one embodiment, a power converter device includes a transformer having a first winding and a second winding. The power converter device further includes zero voltage switch circuitry and zero current switch circuitry. The zero voltage switch circuitry is electrically coupled to the first winding, and configured to be electrically coupled to a DC voltage source via a first port and a second port. The zero current switch circuitry is electrically coupled to the second winding of the transformer and configured to be electrically coupled with an AC power grid.Type: GrantFiled: July 29, 2019Date of Patent: July 13, 2021Assignee: North Carolina State UniversityInventors: Wensong Yu, Iqbal Husain
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Publication number: 20200067424Abstract: Disclosed herein are methods, systems, and devices for providing power conversion between a direct current (DC) source and an alternating current (AC) power grid. According to one embodiment, a power converter device includes a transformer having a first winding and a second winding. The power converter device further includes zero voltage switch circuitry and zero current switch circuitry. The zero voltage switch circuitry is electrically coupled to the first winding, and configured to be electrically coupled to a DC voltage source via a first port and a second port. The zero current switch circuitry is electrically coupled to the second winding of the transformer and configured to be electrically coupled with an AC power grid.Type: ApplicationFiled: July 29, 2019Publication date: February 27, 2020Inventors: Wensong Yu, Iqbal Husain
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Publication number: 20190393798Abstract: A buck-boost power conversion system for converting between direct current (“DC”) voltages and alternating current (“AC”) voltages of different magnitudes can include a DC/AC switched network and an AC/AC switched network for converting a DC voltage to an AC voltage of a different magnitude with a minimized number of inductors and without using a transformer. The buck-boost power conversion system can be bidirectional such that a DC voltage can be converted to an AC voltage and an AC voltage can be converted to a DC voltage. A DC voltage can be input to the buck-boost power conversion system and an AC voltage can be output with a greater or lesser magnitude than the DC voltage. In additional or alternative examples, an AC voltage can be input to the buck-boost power conversion system and a DC voltage can be output with a lesser or greater magnitude than the AC voltage.Type: ApplicationFiled: December 8, 2017Publication date: December 26, 2019Inventors: WENSONG YU, Alex Qin Huang
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Patent number: 9998018Abstract: A multilevel LLC resonant converter comprises a first capacitor and a second capacitor connected in series providing a mid-voltage point of an input dc power source, a resonant tank connected in series with a primary side of a transformer, a first transistor and a second transistor connected in series, wherein a common node of the first transistor and the second transistor is connected to the mid-voltage point through a first isolation switch and a third transistor and a fourth transistor connected in series, wherein a common node of the third transistor and the fourth transistor is connected to the mid-voltage point through a second isolation switch.Type: GrantFiled: October 10, 2016Date of Patent: June 12, 2018Assignee: Futurewei Technologies, Inc.Inventors: Dianbo Fu, Wensong Yu, Hengchun Mao, Heping Dai
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Publication number: 20170033701Abstract: A multilevel LLC resonant converter comprises a first capacitor and a second capacitor connected in series providing a mid-voltage point of an input dc power source, a resonant tank connected in series with a primary side of a transformer, a first transistor and a second transistor connected in series, wherein a common node of the first transistor and the second transistor is connected to the mid-voltage point through a first isolation switch and a third transistor and a fourth transistor connected in series, wherein a common node of the third transistor and the fourth transistor is connected to the mid-voltage point through a second isolation switch.Type: ApplicationFiled: October 10, 2016Publication date: February 2, 2017Inventors: Dianbo Fu, Wensong Yu, Hengchun Mao, Heping Dai
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Patent number: 9467057Abstract: A multilevel LLC resonant converter comprises a resonant tank connected in series with a primary side of a transformer, a first switch and a second switch connected in series, wherein a common node of the first switch and the second switch is coupled to a mid-voltage point through a first isolation switch and the resonant bank and a third switch and a fourth switch connected in series, wherein a common node of the third switch and the fourth switch is coupled to the resonant tank.Type: GrantFiled: May 28, 2015Date of Patent: October 11, 2016Assignee: Futurewei Technologies, Inc.Inventors: Dianbo Fu, Wensong Yu, Hengchun Mao, Heping Dai
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Publication number: 20150263635Abstract: A multilevel LLC resonant converter comprises a resonant tank connected in series with a primary side of a transformer, a first switch and a second switch connected in series, wherein a common node of the first switch and the second switch is coupled to a mid-voltage point through a first isolation switch and the resonant bank and a third switch and a fourth switch connected in series, wherein a common node of the third switch and the fourth switch is coupled to the resonant tank.Type: ApplicationFiled: May 28, 2015Publication date: September 17, 2015Inventors: Dianbo Fu, Wensong Yu, Hengchun Mao, Heping Dai
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Patent number: 9077255Abstract: A multilevel LLC resonant converter comprises a resonant tank connected in series with a primary side of a transformer, a first switch and a second switch connected in series, wherein a common node of the first switch and the second switch is coupled to a mid-voltage point through a first isolation switch and the resonant bank and a third switch and a fourth switch connected in series, wherein a common node of the third switch and the fourth switch is coupled to the resonant tank.Type: GrantFiled: January 11, 2013Date of Patent: July 7, 2015Assignee: Futurewei Technologies, Inc.Inventors: Dianbo Fu, Wensong Yu, Hengchun Mao, Heping Dai
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Patent number: 8830711Abstract: A hybrid switch comprising two semiconductor switches connected in parallel but having different voltage drop characteristics as a function of current facilitates attainment of zero voltage switching and reduces conduction losses to complement reduction of switching losses achieved through zero voltage switching in power converters such as high-current inverters.Type: GrantFiled: August 10, 2011Date of Patent: September 9, 2014Assignee: Virginia Tech Intellectual Properties, Inc.Inventors: Jih-Sheng Lai, Wensong Yu
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Publication number: 20140198536Abstract: A multilevel LLC resonant converter comprises a resonant tank connected in series with a primary side of a transformer, a first switch and a second switch connected in series, wherein a common node of the first switch and the second switch is coupled to a mid-voltage point through a first isolation switch and the resonant bank and a third switch and a fourth switch connected in series, wherein a common node of the third switch and the fourth switch is coupled to the resonant tank.Type: ApplicationFiled: January 11, 2013Publication date: July 17, 2014Applicant: FUTUREWEI TECHNOLOGIES, INC.Inventors: Dianbo Fu, Wensong Yu, Hengchun Mao, Heping Dai
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Publication number: 20120057387Abstract: A hybrid switch comprising two semiconductor switches connected in parallel but having different voltage drop characteristics as a function of current facilitates attainment of zero voltage switching and reduces conduction losses to complement reduction of switching losses achieved through zero voltage switching in power converters such as high-current inverters.Type: ApplicationFiled: August 10, 2011Publication date: March 8, 2012Inventors: Jih-Sheng Lai, Wensong Yu