Patents by Inventor Tianzhu Zhang
Tianzhu 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: 20240125966Abstract: A transient electromagnetic device with variable shape and turns includes squares, a transmitting coil carrying frame, a transmitting coil, a turns-variable device, a current generator and a working power supply. The transmitting coil carrying frame is arranged inside the transmitting coil; the transmitting coil carrying frame is configured as a carrier of the transmitting coil, and configured for adjusting a side length of the transmitting coil and a shape of the transmitting coil; the square is configured for clamping and connecting the transmitting coil and the transmitting coil carrying frame to fix the transmitting coil to the transmitting coil carrying frame. The current generator is configured for generating transient current; the turns-variable device is configured for changing the turns of the transmitting coil; and the transmitting coil is configured for transmitting the transient current to a target area to be measured.Type: ApplicationFiled: December 28, 2022Publication date: April 18, 2024Inventors: Yuesheng LUAN, Shizhong CHEN, Xiaobo WANG, Jikai WANG, Geming ZENG, Gang SHI, Zhijian ZHANG, Liang LI, Jun ZHANG, Tianzhu XU, Liang ZHANG, Xiao PAN, Li XIAO, Zhou'e WANG, Yunfa ZHU, Liangzi YIDU, Yanian ZHANG, Jie LUO
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Patent number: 11630167Abstract: A position sensing system has a trim unit to trim hall voltages generated by a first sensor and a second sensor in response to an excitation current, to compensate a non-orthogonality of the first sensor and the second sensor.Type: GrantFiled: January 19, 2022Date of Patent: April 18, 2023Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Tianzhu Zhang, Serge Reymond, Pavel Kejik
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Publication number: 20220236345Abstract: A position sensing system has a trim unit to trim hall voltages generated by a first sensor and a second sensor in response to an excitation current, to compensate a non-orthogonality of the first sensor and the second sensor.Type: ApplicationFiled: January 19, 2022Publication date: July 28, 2022Inventors: Tianzhu Zhang, Serge Reymond, Pavel Kejik
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Patent number: 10972009Abstract: A COT control circuit used for realizing current sharing in multi-phase DC-DC converter. The multi-phase DC-DC converter has N switching circuits, N controllers, and a trimming current generator receiving N switching voltage signals of the N switching circuits to generate N trimming current signals. The N trimming current signals are respectively sent to the N controllers to regulate on time of at least one controllable switch of each of the N switching circuits so as to finally realize current sharing in the multi-phase circuits.Type: GrantFiled: November 25, 2019Date of Patent: April 6, 2021Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventor: Tianzhu Zhang
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Patent number: 10879810Abstract: A synchronous rectifier OFF control module and a synchronous rectifying control circuit. The synchronous rectifier OFF control module may receive a zero-cross threshold signal and a drain-source voltage signal indicative of a drain to source voltage of a synchronous rectifier, and to compare the drain-source voltage signal with the zero-cross threshold signal to determine whether the rectifier current flowing through the synchronous rectifier is crossing zero. The synchronous rectifier OFF control module may further receive a peak current detection signal indicative of a peak value of the rectifier current, and to adjust the magnitude of the zero-cross threshold signal to vary in the same direction as the peak value of the rectifier current based on the peak current detection signal. The synchronous rectifier OFF control module may provide more accurate control to the turn OFF moment of the synchronous rectifier and thus can help to reduce power loss.Type: GrantFiled: February 25, 2019Date of Patent: December 29, 2020Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventor: Tianzhu Zhang
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Publication number: 20200169170Abstract: A COT control circuit used for realizing current sharing in multi-phase DC-DC converter. The multi-phase DC-DC converter has N switching circuits, N COT controllers, and a trimming current generator receiving N switching voltage signals of the N switching circuits to generate N trimming current signals. The N trimming current signals are respectively sent to the N COT controllers to regulate on time of at least one controllable switch of each of the N switching circuits so as to finally realize current sharing in the multi-phase circuits.Type: ApplicationFiled: November 25, 2019Publication date: May 28, 2020Inventor: Tianzhu Zhang
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Publication number: 20190267906Abstract: A synchronous rectifier OFF control module and a synchronous rectifying control circuit. The synchronous rectifier OFF control module may receive a zero-cross threshold signal and a drain-source voltage signal indicative of a drain to source voltage of a synchronous rectifier, and to compare the drain-source voltage signal with the zero-cross threshold signal to determine whether the rectifier current flowing through the synchronous rectifier is crossing zero. The synchronous rectifier OFF control module may further receive a peak current detection signal indicative of a peak value of the rectifier current, and to adjust the magnitude of the zero-cross threshold signal to vary in the same direction as the peak value of the rectifier current based on the peak current detection signal. The synchronous rectifier OFF control module may provide more accurate control to the turn OFF moment of the synchronous rectifier and thus can help to reduce power loss.Type: ApplicationFiled: February 25, 2019Publication date: August 29, 2019Inventor: Tianzhu Zhang
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Patent number: 10256727Abstract: An interleaved multi-phase power supply with a plurality of DC-DC converter ICs. Each DC-DC converter IC has a current sharing pin, and the current sharing pins of the plurality of DC-DC converter ICs are connected together. Each DC-DC converter IC receives a feedback voltage signal to compare with a reference voltage signal to generate an error voltage signal as a reference of an output current of the corresponding DC-DC converter IC. And each DC-DC converter IC has a mismatch voltage regulation module regulating the error voltage signal to be equal to an average of error voltage signals of the plurality of DC-DC converter ICs.Type: GrantFiled: December 18, 2017Date of Patent: April 9, 2019Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Wanke Tao, Tianzhu Zhang
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Publication number: 20180191251Abstract: An interleaved multi-phase power supply with a plurality of DC-DC converter ICs. Each DC-DC converter IC has a current sharing pin, and the current sharing pins of the plurality of DC-DC converter ICs are connected together. Each DC-DC converter IC receives a feedback voltage signal to compare with a reference voltage signal to generate an error voltage signal as a reference of an output current of the corresponding DC-DC converter IC. And each DC-DC converter IC has a mismatch voltage regulation module regulating the error voltage signal to be equal to an average of error voltage signals of the plurality of DC-DC converter ICs.Type: ApplicationFiled: December 18, 2017Publication date: July 5, 2018Inventors: Wanke Tao, Tianzhu Zhang
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Patent number: 9979288Abstract: Switching mode power supply (SMPS) having a switch circuit and a controller. The switch circuit has an output inductor and a switch with a minimum on time. A control signal is generated by the controller to control the switching operation of the switch based on a clock signal with a switching frequency and an off signal. When the required on time of the switch is smaller than the minimum on time, the SMPS reduces the switching frequency adaptively and the actual on time of the switch is controlled to be the minimum on time.Type: GrantFiled: April 12, 2017Date of Patent: May 22, 2018Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Wei Mao, Tianzhu Zhang
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Publication number: 20170302175Abstract: Switching mode power supply (SMPS) having a switch circuit and a controller. The switch circuit has an output inductor and a switch with a minimum on time. A control signal is generated by the controller to control the switching operation of the switch based on a clock signal with a switching frequency and an off signal. When the required on time of the switch is smaller than the minimum on time, the SMPS reduces the switching frequency adaptively and the actual on time of the switch is controlled to be the minimum on time.Type: ApplicationFiled: April 12, 2017Publication date: October 19, 2017Inventors: Wei Mao, Tianzhu Zhang
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Patent number: 9779827Abstract: A voltage control circuit for a memory cell having a floating gate transistor and a capacitive device, comprising a first input terminal, a second input terminal, a first output terminal and a second input terminal, wherein the first input terminal is configured to receive a power supply voltage, the second input terminal is configured to receive a ground reference, and wherein based on the power supply voltage and the ground reference, the first output terminal and the second output terminal respectively provides a first voltage signal and a second voltage signal, and wherein a voltage value of the first voltage signal is twice the power supply voltage, and a maximum of a voltage difference between the first voltage signal and the second voltage signal is three times the power supply voltage.Type: GrantFiled: November 17, 2016Date of Patent: October 3, 2017Assignee: Monolithic Power Systems, Inc.Inventors: Tianzhu Zhang, Da Chen
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Publication number: 20170154684Abstract: A voltage control circuit for a memory cell having a floating gate transistor and a capacitive device, comprising a first input terminal, a second input terminal, a first output terminal and a second input terminal, wherein the first input terminal is configured to receive a power supply voltage, the second input terminal is configured to receive a ground reference, and wherein based on the power supply voltage and the ground reference, the first output terminal and the second output terminal respectively provides a first voltage signal and a second voltage signal, and wherein a voltage value of the first voltage signal is twice the power supply voltage, and a maximum of a voltage difference between the first voltage signal and the second voltage signal is three times the power supply voltage.Type: ApplicationFiled: November 17, 2016Publication date: June 1, 2017Inventors: Tianzhu Zhang, Da Chen
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Patent number: 9608519Abstract: A switching converter having a power stage with a main switch to convert an input voltage to an output voltage; a current sense circuit generating a current sense signal indicative of a current flowing through the main switch; a PWM generator generating a PWM signal; an OFF time controller generating an OFF time control signal relating to the input voltage and the output voltage; and a logic circuit generating a switching signal based on the OFF time control signal and the PWM signal to control the main switch.Type: GrantFiled: September 5, 2013Date of Patent: March 28, 2017Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Chuan Ding, Tianzhu Zhang
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Patent number: 9529031Abstract: There is provided a grounding detection device and method. The grounding detection device may include an insulation tester and a grounding resistance providing unit. The insulation tester may be mounted in a first cabinet, electrically connected to a positive busbar and a negative busbar to detect an equivalent busbar-to-ground resistance, and grounded via the first cabinet. The grounding resistance providing unit may be mounted at least in part in a second cabinet different from the first cabinet, electrically connected to at least one of the positive busbar and the negative busbar to provide a grounding resistance, and grounded via the second cabinet. The insulation tester may determine, based on resistance values of the equivalent busbar-to-ground resistance and the grounding resistance, whether there is a ground fault or not for the insulation tester, the first cabinet, and the second cabinet.Type: GrantFiled: January 13, 2014Date of Patent: December 27, 2016Assignee: Emerson Network Power, Energy Systems, North America, Inc.Inventors: Tianzhu Zhang, Longwen Hu, Zhiyi You
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Publication number: 20140266234Abstract: There is provided a grounding detection device and method. The grounding detection device may include an insulation tester and a grounding resistance providing unit. The insulation tester may be mounted in a first cabinet, electrically connected to a positive busbar and a negative busbar to detect an equivalent busbar-to-ground resistance, and grounded via the first cabinet. The grounding resistance providing unit may be mounted at least in part in a second cabinet different from the first cabinet, electrically connected to at least one of the positive busbar and the negative busbar to provide a grounding resistance, and grounded via the second cabinet. The insulation tester may determine, based on resistance values of the equivalent busbar-to-ground resistance and the grounding resistance, whether there is a ground fault or not for the insulation tester, the first cabinet, and the second cabinet.Type: ApplicationFiled: January 13, 2014Publication date: September 18, 2014Applicant: Emerson Network Power Co., Ltd.Inventors: Tianzhu Zhang, Longwen Hu, Zhiyi You
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Publication number: 20140253079Abstract: A switching converter having a power stage with a main switch to convert an input voltage to an output voltage; a current sense circuit generating a current sense signal indicative of a current flowing through the main switch; a PWM generator generating a PWM signal; an OFF time controller generating an OFF time control signal relating to the input voltage and the output voltage; and a logic circuit generating a switching signal based on the OFF time control signal and the PWM signal to control the main switch.Type: ApplicationFiled: September 5, 2013Publication date: September 11, 2014Applicant: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Chuan Ding, Tianzhu Zhang
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Publication number: 20130335635Abstract: A video of a scene includes multiple frames, each of which is registered using sparse registration to spatially align the frame to a reference image of the video. Based on the registered multiple frames as well as both an image domain and a field domain, one or more objects in the video are tracked using particle filtering. Object trajectories for the one or more objects in the video are also generated based on the tracking, and can optionally be used in various manners.Type: ApplicationFiled: March 14, 2013Publication date: December 19, 2013Inventors: Bernard Ghanem, Shaunak Ahuja, Tianzhu Zhang, Indriyati Atmosukarto