Patents by Inventor Chris Mi
Chris Mi 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: 20220416549Abstract: Embodiments of the present disclosure provide an active equalizer circuit, a battery management system, a power supply system and an electrical equipment. The active equalizer circuit comprises a plurality of switching transistors, a driving transformer, a multi-port converter, a buck converter, and a microcontroller. Each of the switching transistors is coupled to a battery cell in the series battery pack on a one-to-one basis. The multi-port converter comprises an equalizing transformer and a bridge converter, each secondary winding of the bridge converter is coupled to a corresponding plurality of battery cells. The buck converter has an input terminal coupled to an output terminal of the series battery pack and an output terminal coupled to an input terminal of the bridge converter.Type: ApplicationFiled: March 20, 2019Publication date: December 29, 2022Inventors: Chunting Chris MI, Panpan HU, Yunlong SHANG, Bing HAN, Yuhong FU, Xiaohong HU, Dingguo WU
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Patent number: 10903532Abstract: A fault tolerant voltage measurement method for battery management systems is proposed for reliable and prompt cell fault and sensor fault detection. The key of the method is that it correlates one voltage sensor reading with multiple cell voltages and vice versa. When a cell fault occurs, fault readings will be revealed by multiple voltage sensor readings. Similarly, when a sensor fault occurs, multiple cell voltages will be influenced. Compared with the traditional one-to-one correspondence voltage measurement, the proposed method increases the credibility of sensor/cell fault decisions. Furthermore, it does not increase the hardware cost, and is easy to be adopted in real applications.Type: GrantFiled: August 4, 2016Date of Patent: January 26, 2021Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Chris Mi, Bing Xia
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Publication number: 20200091562Abstract: A fault tolerant voltage measurement method for battery management systems is proposed for reliable and prompt cell fault and sensor fault detection. The key of the method is that it correlates one voltage sensor reading with multiple cell voltages and vice versa. When a cell fault occurs, fault readings will be revealed by multiple voltage sensor readings. Similarly, when a sensor fault occurs, multiple cell voltages will be influenced. Compared with the traditional one-to-one correspondence voltage measurement, the proposed method increases the credibility of sensor/cell fault decisions. Furthermore, it does not increase the hardware cost, and is easy to be adopted in real applications.Type: ApplicationFiled: August 4, 2016Publication date: March 19, 2020Inventors: Chris MI, Bing XIA
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Patent number: 10298057Abstract: A double-sided LCLC-compensated network is proposed for a capacitive power transfer (CPT) system. In one design, four metal plates are used to form two power transmitting and receiving capacitors and the LCLC network is used to compensate the capacitors. In the second design, two extra metal plates are used to couple with the previous four plates at the transmitting and receiving side, respectively, which forms the capacitor-integrated structure. The circuit parameter values are tuned to achieve zero voltage switching (ZVS) of the input side switches. There is also a CLLC topology proposed, which is a similar variation of LCLC circuit. A 3.3 kW input power capacitive power transfer prototype is designed and built. The experiment results show that the proposed CPT system can transfer 3.1 kW output power through an air gap distance of 70 mm with a dc-to-dc efficiency of 92.1%.Type: GrantFiled: April 1, 2016Date of Patent: May 21, 2019Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Chris Mi, Hua Zhang, Fei Lu
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Patent number: 10000134Abstract: A wireless charging system may be used to charge a battery in a vehicle via a receiving coil. The wireless charging system may include a coil charge device, a linear track, a linear motor, and a charge control module. The coil charge device includes a carriage and a transmitting coil positioned on the carriage. The linear track extends across a designated path. The coil charge device is positioned on and moveable along the linear track. The linear motor is operable to move the coil charge device along the linear track. The charge control module controls a position of the coil charge device along the designated path via the linear motor.Type: GrantFiled: March 28, 2016Date of Patent: June 19, 2018Assignees: DENSO International America, Inc., The Regents of The University of MichiganInventors: Wei Zhang, Jeff C. White, Chris Mi
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Patent number: 9789777Abstract: A double-sided LCC compensation network and a tuning method are proposed for a wireless power transfer system. With the proposed topology, the resonant frequency is independent of coupling coefficient and load conditions. The parameter values are tuned to realize zero voltage switching (ZVS) for the sending side switches. A wireless charging system with up to 7.7 kW output power was designed and built using the proposed topology and achieved 96% efficiency from DC power source to battery load.Type: GrantFiled: July 10, 2014Date of Patent: October 17, 2017Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Chris Mi, Junjun Deng, Trong-Duy Nguyen, Weihan Li, Siqi Li
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Publication number: 20170274788Abstract: A wireless charging system may be used to charge a battery in a vehicle via a receiving coil. The wireless charging system may include a coil charge device, a linear track, a linear motor, and a charge control module. The coil charge device includes a carriage and a transmitting coil positioned on the carriage. The linear track extends across a designated path. The coil charge device is positioned on and moveable along the linear track. The linear motor is operable to move the coil charge device along the linear track. The charge control module controls a position of the coil charge device along the designated path via the linear motor.Type: ApplicationFiled: March 28, 2016Publication date: September 28, 2017Inventors: Wei ZHANG, Jeff C. WHITE, Chris MI
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Patent number: 9559581Abstract: A bidirectional AC-DC converter is presented with reduced passive component size and common mode electro-magnetic interference. The converter includes an improved input stage formed by two coupled differential inductors, two coupled common and differential inductors, one differential capacitor and two common mode capacitors. With this input structure, the volume, weight and cost of the input stage can be reduced greatly. Additionally, the input current ripple and common mode electro-magnetic interference can be greatly attenuated, so lower switching frequency can be adopted to achieve higher efficiency.Type: GrantFiled: April 11, 2014Date of Patent: January 31, 2017Assignee: The Regents of the University of MichiganInventors: Chris Mi, Siqi Li
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Patent number: 9496746Abstract: A wireless power transmission system is provided for high power applications. The power transmission system is comprised generally of a charging unit configured to generate an alternating electromagnetic field and a receive unit configured to receive the alternating electromagnetic field from the charging unit. The charging unit includes a power source; an input rectifier; an inverter; and a transmit coil. The transmit coil has a spirangle arrangement segmented into n coil segments with capacitors interconnecting adjacent coil segments. The receive unit includes a receive coil and an output rectifier. The receive coil also has a spirangle arrangement segmented into m coil segments with capacitors interconnecting adjacent coil segments.Type: GrantFiled: May 14, 2014Date of Patent: November 15, 2016Assignee: The Regents Of The University Of MichiganInventors: Chris Mi, Siqi Li, Trong-Duy Nguyen, Junhua Wang, Jiangui Li, Weihan Li, Jun Xu
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Publication number: 20160294217Abstract: A double-sided LCLC-compensated network is proposed for a capacitive power transfer (CPT) system. In one design, four metal plates are used to form two power transmitting and receiving capacitors and the LCLC network is used to compensate the capacitors. In the second design, two extra metal plates are used to couple with the previous four plates at the transmitting and receiving side, respectively, which forms the capacitor-integrated structure. The circuit parameter values are tuned to achieve zero voltage switching (ZVS) of the input side switches. There is also a CLLC topology proposed, which is a similar variation of LCLC circuit. A 3.3 kW input power capacitive power transfer prototype is designed and built. The experiment results show that the proposed CPT system can transfer 3.1 kW output power through an air gap distance of 70 mm with a dc-to-dc efficiency of 92.1%.Type: ApplicationFiled: April 1, 2016Publication date: October 6, 2016Inventors: Chris MI, Hua ZHANG, Fei LU
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Publication number: 20150015197Abstract: A double-sided LCC compensation network and a tuning method are proposed for a wireless power transfer system. With the proposed topology, the resonant frequency is independent of coupling coefficient and load conditions. The parameter values are tuned to realize zero voltage switching (ZVS) for the sending side switches. A wireless charging system with up to 7.7 kW output power was designed and built using the proposed topology and achieved 96% efficiency from DC power source to battery load.Type: ApplicationFiled: July 10, 2014Publication date: January 15, 2015Inventors: Chris Mi, Junjun Deng, Trong-Duy Nguyen, Weihan Li, Siqi Li
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Publication number: 20140340031Abstract: A wireless power transmission system is provided for high power applications. The power transmission system is comprised generally of a charging unit configured to generate an alternating electromagnetic field and a receive unit configured to receive the alternating electromagnetic field from the charging unit. The charging unit includes a power source; an input rectifier; an inverter; and a transmit coil. The transmit coil has a spirangle arrangement segmented into n coil segments with capacitors interconnecting adjacent coil segments. The receive unit includes a receive coil and an output rectifier. The receive coil also has a spirangle arrangement segmented into m coil segments with capacitors interconnecting adjacent coil segments.Type: ApplicationFiled: May 14, 2014Publication date: November 20, 2014Inventors: Chris Mi, Siqi Li, Trong-Duy Nguyen, Junhua Wang, Jiangui Li, Weihan Li, Jun Xu
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Publication number: 20140313795Abstract: A bidirectional AC-DC converter is presented with reduced passive component size and common mode electro-magnetic interference. The converter includes an improved input stage formed by two coupled differential inductors, two coupled common and differential inductors, one differential capacitor and two common mode capacitors. With this input structure, the volume, weight and cost of the input stage can be reduced greatly. Additionally, the input current ripple and common mode electro-magnetic interference can be greatly attenuated, so lower switching frequency can be adopted to achieve higher efficiency.Type: ApplicationFiled: April 11, 2014Publication date: October 23, 2014Applicant: The Regents of The University of MichiganInventors: Chris Mi, Siqi Li