Patents by Inventor Chuntao Zhang
Chuntao Zhang 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: 20220045623Abstract: A multi-level circuit, a three-phase multi-level circuit, and a control method are provided. The multi-level circuit includes two groups of bus capacitors that are connected in series. The circuit further includes a plurality of switching transistor branches that are connected in parallel to the capacitors, where each switching transistor branch includes a first half bridge and a second half bridge, and a common terminal of the two half bridges is grounded. Furthermore, the circuit includes two coupled inductors, where each input terminal of each coupled inductor is connected to a common terminal of two switching transistors in the first half bridge in the switching transistor branches. In this circuit, a quantity of groups of bus capacitors is decreased and circuit design complexity is reduced. Further, a dropout voltage of the switching transistors is reduced.Type: ApplicationFiled: October 22, 2021Publication date: February 10, 2022Inventors: Zhuyong HUANG, Xiaofei Zhang, Chuntao Zhang
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Patent number: 11245282Abstract: A working method of a modular uninterruptible power supply (UPS) includes: obtaining working parameters of the modular UPS, where the working parameters include an input voltage parameter, a load parameter, and a battery parameter; and adjusting a working mode of a power module in the modular UPS according to at least one of the working parameters of the modular UPS, so that not all power modules are in a same working mode, where the modular UPS includes K working modules, and 2?K.Type: GrantFiled: May 30, 2019Date of Patent: February 8, 2022Assignee: Huawei Technologies Co., Ltd.Inventor: Chuntao Zhang
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Patent number: 11239765Abstract: A multi-level circuit, a three-phase multi-level circuit, and a control method are provided. The multi-level circuit includes two groups of bus capacitors (C1 and C2) that are connected in series; a plurality of switching transistor branches that are connected in parallel to the capacitors, where each switching transistor branch includes a first half bridge (Q1 and Q2) and a second half bridge (Q3 and Q4), and a common terminal of the two half bridges is grounded (N); and two negative coupled inductors (L1 and L2), where each input terminal of each negative coupled inductor is connected to a common terminal (A1 and A2) of two switching transistors in the first half bridge in only one of the switching transistor branches. In this circuit, a quantity of groups of bus capacitors is decreased and circuit design complexity is reduced. Further, a dropout voltage of the switching transistors is reduced.Type: GrantFiled: November 27, 2019Date of Patent: February 1, 2022Assignee: HUAWEI TECHNOLOGIES CO., LTD.Inventors: Zhuyong Huang, Xiaofei Zhang, Chuntao Zhang
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Publication number: 20210408808Abstract: This application provides a battery equalization circuit to resolve a problem of insufficient charging or discharging of some batteries due to differences between a plurality of batteries in a battery group. Equalization sub-circuits of the battery equalization circuit each include a battery cell, a first bidirectional switch, and a second bidirectional switch. Battery cells of the plurality of equalization sub-circuits are connected in series. When a strobe terminal of the first bidirectional switch receives a turning-on signal, the first bidirectional switch is turned on and couples the positive electrode of the battery cell to a first terminal of an energy storage device. When a strobe terminal of the second bidirectional switch receives a turning-on signal, the second bidirectional switch is turned on and couples the negative electrode of the battery cell to the second terminal of the energy storage device.Type: ApplicationFiled: September 10, 2021Publication date: December 30, 2021Inventor: Chuntao ZHANG
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Publication number: 20200119658Abstract: A bridge circuit for an inverter or a rectifier, includes a first switch, a second switch, a third switch, and a fourth switch that are mutually connected in series and that are electrically connected between a positive direct current voltage source and a negative direct current voltage source. The first switch and the second switch include at least one combined field effect transistor; and the third switch and the fourth switch include at least one combined field effect transistor. The combined field effect transistor is a high withstand voltage field effect transistor and a low withstand voltage field effect transistor whose sources or drains are electrically connected to each other. Parasitic diodes in the combined field effect transistor are reversely connected in series. Therefore, a path of a freewheeling current in the parasitic diodes is blocked, and a switching loss and a spike voltage are reduced.Type: ApplicationFiled: December 12, 2019Publication date: April 16, 2020Applicant: HUAWEI TECHNOLOGIES CO., LTD.Inventor: Chuntao Zhang
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Publication number: 20200099313Abstract: A multi-level circuit, a three-phase multi-level circuit, and a control method are provided. The multi-level circuit includes two groups of bus capacitors (C1 and C2) that are connected in series; a plurality of switching transistor branches that are connected in parallel to the capacitors, where each switching transistor branch includes a first half bridge (Q1 and Q2) and a second half bridge (Q3 and Q4), and a common terminal of the two half bridges is grounded (N); and two negative coupled inductors (L1 and L2), where each input terminal of each negative coupled inductor is connected to a common terminal (A1 and A2) of two switching transistors in the first half bridge in only one of the switching transistor branches. In this circuit, a quantity of groups of bus capacitors is decreased and circuit design complexity is reduced. Further, a dropout voltage of the switching transistors is reduced.Type: ApplicationFiled: November 27, 2019Publication date: March 26, 2020Inventors: Zhuyong HUANG, Xiaofei ZHANG, Chuntao ZHANG
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Publication number: 20190280520Abstract: A working method of a modular uninterruptible power supply (UPS) includes: obtaining working parameters of the modular UPS, where the working parameters include an input voltage parameter, a load parameter, and a battery parameter; and adjusting a working mode of a power module in the modular UPS according to at least one of the working parameters of the modular UPS, so that not all power modules are in a same working mode, where the modular UPS includes K working modules, and 2?K.Type: ApplicationFiled: May 30, 2019Publication date: September 12, 2019Inventor: Chuntao ZHANG
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Patent number: 10333427Abstract: This disclosure relates to an equivalent transistor and a three-level inverter, and pertains to the field of power electronics technologies. The equivalent transistor includes a first transistor, a second transistor, and a diode. A source electrode of the first transistor is electrically connected to a source electrode of the second transistor; a gate electrode of the first transistor is electrically connected to a gate electrode of the second transistor; and one end of the diode is electrically connected to a drain electrode of the first transistor, and the other end of the diode is electrically connected to a drain electrode of the second transistor. According to this disclosure, a reverse recovery time can be reduced, and a switching speed of the equivalent transistor can increase.Type: GrantFiled: June 22, 2018Date of Patent: June 25, 2019Assignee: HUAWEI TECHNOLOGIES CO., LTD.Inventors: Zhaoxue Cui, Chuntao Zhang
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Publication number: 20180302005Abstract: This disclosure relates to an equivalent transistor and a three-level inverter, and pertains to the field of power electronics technologies. The equivalent transistor includes a first transistor, a second transistor, and a diode. A source electrode of the first transistor is electrically connected to a source electrode of the second transistor; a gate electrode of the first transistor is electrically connected to a gate electrode of the second transistor; and one end of the diode is electrically connected to a drain electrode of the first transistor, and the other end of the diode is electrically connected to a drain electrode of the second transistor. According to this disclosure, a reverse recovery time can be reduced, and a switching speed of the equivalent transistor can increase.Type: ApplicationFiled: June 22, 2018Publication date: October 18, 2018Inventors: Zhaoxue CUI, Chuntao ZHANG
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Patent number: 10014719Abstract: An uninterruptible power system is provided. When a first power supply of the system is faulty, in a process in which a switch unit switches power supply from the first power supply to a second power supply, the second power supply discharges to a direct current bus using a bidirectional power converter, electric energy stored in the direct current bus is also discharged in a short time in a process of the switch, and the direct current bus outputs both a discharging current of the second power supply and a discharging current of the direct current bus to a system output end, which ensures that the direct current bus outputs a stable voltage in a gap period of an action of the switch unit.Type: GrantFiled: March 29, 2016Date of Patent: July 3, 2018Assignee: HUAWEI TECHNOLOGIES CO., LTD.Inventor: Chuntao Zhang
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Publication number: 20160211700Abstract: An uninterruptible power system is provided. When a first power supply of the system is faulty, in a process in which a switch unit switches power supply from the first power supply to a second power supply, the second power supply discharges to a direct current bus using a bidirectional power converter, electric energy stored in the direct current bus is also discharged in a short time in a process of the switch, and the direct current bus outputs both a discharging current of the second power supply and a discharging current of the direct current bus to a system output end, which ensures that the direct current bus outputs a stable voltage in a gap period of an action of the switch unit.Type: ApplicationFiled: March 29, 2016Publication date: July 21, 2016Inventor: Chuntao Zhang
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Patent number: 8699253Abstract: The present invention discloses a control method for a soft switch circuit in a switch power source, which generates an alternating primary power filter current by controlling first and second primary power switching devices to be closed and opened, and generates an intermittent alternating resonant current in the same direction as the primary power filter current in a resonant branch by controlling forward and backward auxiliary switching devices to be closed and opened to thereby achieve closing of the first and second primary power switching devices at a zero voltage, and which generates a balance current with the same magnitude as and in the opposite direction to the resonant current in the resonant branch in at least a period of time during the resting of the resonant current by further controlling the forward and backward auxiliary switching devices to be closed and opened to thereby achieve an average current of zero across the resonant branch in a switching cycle.Type: GrantFiled: September 5, 2008Date of Patent: April 15, 2014Assignee: Liebert CorporationInventors: Chuntao Zhang, Xiaofei Zhang, Xueli Xiao
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Patent number: 8600406Abstract: A first position (104) of the mobile client is determined at least in part by utilizing first signals received from at least one first signal source. The first signal source operates in a first location determination system (114). A second position (106) of at least one second signal source (120) is determined by utilizing both the determined first position of the mobile client and second signals received from the at least one second signal source (120). The second signal source (120) operates in a second location determination system. A third position (116) of the mobile client is determined utilizing the second signal source (120).Type: GrantFiled: November 25, 2009Date of Patent: December 3, 2013Inventors: Shaowei Pan, Xiaohua Wu, Chuntao Zhang
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Patent number: 8416592Abstract: The present invention relates to a control method for a soft switch circuit in a switch power supply, which controls first and second main power switch devices to be turned on and turned off constantly to generate an alternating main power filter current, and controls forward and backward auxiliary switch devices to be turned on and turned off to generate an intermittent alternating resonant current across a resonant branch in the same direction as the main power filter current to thereby achieve zero-voltage turn-on of the first and second main power switch devices; and further controls the forward and backward auxiliary switch devices to be turned on and turned off to generate compensation currents across the resonant branch in the opposite direction to the alternating main power filter current in at least a period of time during resting of the resonant current to thereby accomplish a charging and discharging process of resonant capacitors in a dead time.Type: GrantFiled: September 8, 2008Date of Patent: April 9, 2013Assignee: Liebert CorporationInventors: Chuntao Zhang, Xiaofei Zhang, Xueli Xiao
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Publication number: 20120238293Abstract: A first position (104) of the mobile client is determined at least in part by utilizing first signals received from at least one first signal source. The first signal source operates in a first location determination system (114). A second position (106) of at least one second signal source (120) is determined by utilizing both the determined first position of the mobile client and second signals received from the at least one second signal source (120). The second signal source (120) operates in a second location determination system. A third position (116) of the mobile client is determined utilizing the second signal source (120).Type: ApplicationFiled: November 25, 2009Publication date: September 20, 2012Inventors: Shaowei Pan, Xiaohua Wu, Chuntao Zhang
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Patent number: 8215550Abstract: Disclosed is a method for a scanning device to tell its user how to best orient the scanning device to scan a target location. The user approaches the target location and initiates a scan. The results of the scan are analyzed and compared to information about the target location. Based on the analysis, the user is told how to re-orient the scanning device, if that is necessary to achieve an acceptable re-scan of the target location. In a preferred embodiment, a screen on the scanning device presents a two-dimensional map based on the scan results and on the known relative locations of the target location and of nearby non-target locations. Locations on the map are highlighted to tell the user the results of the scan and to direct him to re-orient the scanning device if necessary.Type: GrantFiled: December 18, 2009Date of Patent: July 10, 2012Assignee: Motorola Solutions, Inc.Inventors: Swee M. Mok, Thomas S. Babin, Timothy J. Collins, Julius S. Gyorfi, Tom Mathew, Chuntao Zhang
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Publication number: 20110278953Abstract: The present invention discloses a control method for a soft switch circuit in a switch power source, which generates an alternating primary power filter current by controlling first and second primary power switching devices to be closed and opened, and generates an intermittent alternating resonant current in the same direction as the primary power filter current in a resonant branch by controlling forward and backward auxiliary switching devices to be closed and opened to thereby achieve closing of the first and second primary power switching devices at a zero voltage, and which generates a balance current with the same magnitude as and in the opposite direction to the resonant current in the resonant branch in at least a period of time during the resting of the resonant current by further controlling the forward and backward auxiliary switching devices to be closed and opened to thereby achieve an average current of zero across the resonant branch in a switching cycle.Type: ApplicationFiled: September 5, 2008Publication date: November 17, 2011Applicant: LIEBERT CORPORATIONInventors: Chuntao Zhang, Xiaofei Zhang, Xueli Xiao
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Publication number: 20110260922Abstract: Disclosed is a system for updating an RSSI-based map. A scanning devices notes which tags are seen during a scan and measures a “proxy distance” from the scanning device to each tag. When the scan is initiated, the scanning device measures the RSSIs from the local WAPs. The current location of the scanning device is determined by triangulating from the proxy distances of the scanned tags. That location is then correlated with the contemporaneously measured RSSIs. The correlation is used to update the RSSI-based map. In some embodiments, it is not the scanning device that measures the RSSIs. Instead, the WAPs measure the RSSIs from the scanning device whenever the scanning device transmits the results of a scan. In some embodiments, the operator of the mapped environment places scannable tags at fixed locations. Scans of these fixed-location tags are especially useful when determining the current location of the scanning device.Type: ApplicationFiled: April 21, 2010Publication date: October 27, 2011Applicant: MOTOROLA, INC.Inventors: Chuntao Zhang, Thomas S. Babin, Timothy J. Collins, Julius S. Gyorfi, Tom Mathew, Swee M. Mok
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Publication number: 20110147455Abstract: Disclosed is a method for a scanning device to tell its user how to best orient the scanning device to scan a target location. The user approaches the target location and initiates a scan. The results of the scan are analyzed and compared to information about the target location. Based on the analysis, the user is told how to re-orient the scanning device, if that is necessary to achieve an acceptable re-scan of the target location. In a preferred embodiment, a screen on the scanning device presents a two-dimensional map based on the scan results and on the known relative locations of the target location and of nearby non-target locations. Locations on the map are highlighted to tell the user the results of the scan and to direct him to re-orient the scanning device if necessary.Type: ApplicationFiled: December 18, 2009Publication date: June 23, 2011Applicant: MOTOROLA, INC.Inventors: Swee M. Mok, Thomas S. Babin, Timothy J. Collins, Julius S. Gyorfi, Tom Mathew, Chuntao Zhang
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Publication number: 20110124348Abstract: A first position (104) of the mobile client is determined at least in part by utilizing first signals received from at least one first signal source. The first signal source operates in a first location determination system (114). A second position (106) of at least one second signal source (120) is determined by utilizing both the determined first position of the mobile client and second signals received from the at least one second signal source (120). The second signal source (120) operates in a second location determination system. A third position (116) of the mobile client is determined utilizing the second signal source (120).Type: ApplicationFiled: November 25, 2009Publication date: May 26, 2011Inventors: Shaowei Pan, Xiaohua Wu, Chuntao Zhang