Patents by Inventor Xiaokang Wu
Xiaokang Wu 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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Patent number: 11933282Abstract: An inductive plasma acceleration apparatus, comprising a pulse laser assembly, a pulsed discharge assembly, an exciting coil assembly, a solid-state working medium, and a control assembly; the exciting coil assembly is electrically connected to the pulsed discharge assembly such that a strong pulse current is produced in the exciting coil assembly during the discharge process of the pulse discharge assembly, and an inductive pulse electromagnetic field is excited around the exciting coil assembly; the solid-state working medium is positioned on the optical path of a pulse laser emitted by the pulse laser assembly such that the solid-state working medium produces a pulse gas under the ablation action of the pulse laser, and the inductive pulse electromagnetic field is positioned on the circulation gas path of the pulse gas such that the pulse gas can enter the inductive pulse electromagnetic field.Type: GrantFiled: September 25, 2020Date of Patent: March 19, 2024Assignee: NATIONAL UNIVERSITY OF DEFENSE TECHNOLOGYInventors: Xiaokang Li, Mousen Cheng, Jianjun Wu, Bixuan Che, Moge Wang, Dawei Guo, Xiong Yang
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Patent number: 11637496Abstract: A switching converter has four switches and a control circuit. The control circuit provides a first drive signal to control a first switch and a second drive signal to control a second switch based on a first set signal, and provides a third drive signal to control the third switch and a fourth drive signal to control the fourth switch based on a second set signal. When an output voltage is larger than an input voltage, an on-time period of the third switch is adaptively adjusted according to the input voltage, the output voltage and a first parameter. When the output voltage is less than the input voltage, the on-time period of the third switch is adaptively adjusted according to the input voltage, the output voltage and a second parameter.Type: GrantFiled: August 3, 2021Date of Patent: April 25, 2023Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Zhiyuan Yu, Xiaokang Wu, Min Xu
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Publication number: 20220060113Abstract: A switching converter has four switches and a control circuit. The control circuit provides a first drive signal to control a first switch and a second drive signal to control a second switch based on a first set signal, and provides a third drive signal to control the third switch and a fourth drive signal to control the fourth switch based on a second set signal. When an output voltage is larger than an input voltage, an on-time period of the third switch is adaptively adjusted according to the input voltage, the output voltage and a first parameter. When the output voltage is less than the input voltage, the on-time period of the third switch is adaptively adjusted according to the input voltage, the output voltage and a second parameter.Type: ApplicationFiled: August 3, 2021Publication date: February 24, 2022Inventors: Zhiyuan Yu, Xiaokang Wu, Min Xu
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Patent number: 10725938Abstract: An auto-loop regulation system for a voltage regulator receives a plurality of pre-determined loop parameters through an interactive computing equipment, and the voltage regulator operates according to the plurality of pre-determined loop parameters, wherein the interactive computing equipment regulates at least one of the loop parameters automatically in real time according to an online loop value when the voltage regulator is operating online, and the interactive computing equipment keeps regulating the loop parameters until the online value of the voltage regulator matches with a target value.Type: GrantFiled: October 29, 2018Date of Patent: July 28, 2020Assignee: Monolithic Power Systems, Inc.Inventors: Lijie Jiang, Xiaokang Wu, Suhua Luo, Qian Ouyang
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Patent number: 10673336Abstract: A DC-DC converter with droop regulation for better transient performance. The DC-DC converter includes a switching circuit, a comparison circuit and a logic control circuit. A differential voltage indicative of an output voltage of the switching circuit, and a droop voltage indicative of an output current of the switching circuit, are generated. A high-pass filtered signal is obtained by high-pass filtering the droop voltage. The comparison circuit responds to the differential voltage, a reference voltage and the high-pass filtered signal to generate a set signal. The logic control circuit generates a control signal based on the set signal to control the switching circuit.Type: GrantFiled: December 13, 2018Date of Patent: June 2, 2020Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Lijie Jiang, Xiaokang Wu, Binci Xu
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Patent number: 10651721Abstract: A multi-phase converter has a plurality of switching circuits coupled in parallel and a control circuit. The control circuit provides a set signal to successively turn ON the switching circuits under power operation based on an output voltage, a reference signal and a nonlinear control signal. When a number of switching circuits under power operation decreases, the nonlinear control signal increases to a preset value from an initial value, and then the nonlinear control signal decreases to the initial value with a preset slew rate.Type: GrantFiled: June 26, 2019Date of Patent: May 12, 2020Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Xiaokang Wu, Lijie Jiang, Suhua Luo
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Patent number: 10620677Abstract: An autonomous power system has a voltage regulator which converts an input voltage to an output voltage according to a reference voltage. A control method for the power system: receiving a voltage identification code sent by a processor; providing an autonomous voltage identification code when the voltage identification sent by the processor keeps constant during a first preset duration, wherein the autonomous voltage identification code can be updated self-adaptively; providing a reference voltage according to a sum of the voltage identification code and the autonomous identification code; and adjusting the output voltage according to the reference voltage.Type: GrantFiled: December 14, 2017Date of Patent: April 14, 2020Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Reagan Luo, Qian Ouyang, Lijie Jiang, Marvin Ma, Xiaokang Wu
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Publication number: 20200007023Abstract: A multi-phase converter has a plurality of switching circuits coupled in parallel and a control circuit. The control circuit provides a set signal to successively turn ON the switching circuits under power operation based on an output voltage, a reference signal and a nonlinear control signal. When a number of switching circuits under power operation decreases, the nonlinear control signal increases to a preset value from an initial value, and then the nonlinear control signal decreases to the initial value with a preset slew rate.Type: ApplicationFiled: June 26, 2019Publication date: January 2, 2020Inventors: Xiaokang Wu, Lijie Jiang, Suhua Luo
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Patent number: 10498241Abstract: A control method of multi-phase converters, wherein the multi-phase converter includes a plurality of switching circuits coupled in parallel between an input voltage and a load. The control method includes: comparing a feedback signal with a reference signal to generate a comparison signal, wherein the feedback signal is indicative of an output voltage provided to the load; determining the number of switching circuits for power operation based on the load current; detecting a period of the comparison signal; comparing the detected period of the comparison signal with a time threshold to determine whether a transient rise of load current has occurred; and getting all the switching circuits into power operation if a transient rise of load current is detected.Type: GrantFiled: December 20, 2018Date of Patent: December 3, 2019Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Xiaokang Wu, Lijie Jiang, Binci Xu
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Patent number: 10468973Abstract: An over current protecting circuit, used with a switching converter having a switch, having: a current limiting circuit, configured to receive a limit indicating signal and to provide an on time signal to control an on time period of the switch based on the limit indicating signal, wherein if the limit indicating signal indicates a current flowing through the switch of the switching converter is larger than a limiting threshold, the on time period of a next switching cycle of the switch is subtracted with a first period, otherwise, the on time period of the switch of the next switching cycle is added with a second period; wherein a maximum on time period of the switch is fixed to be an on time reference.Type: GrantFiled: August 14, 2018Date of Patent: November 5, 2019Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Xiaokang Wu, Qian Ouyang, Yu Zhang, Xiaogang Wei
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Patent number: 10348197Abstract: A DC-DC converter with transient control. The DC-DC converter includes a power switching circuit, a current to voltage converter, a PI circuit 403, a voltage to current converter 404 and a logic and control circuit 405. The DC-DC converter obtains the transient information of a current flowing through the power switching circuit, to slow down the variation of the output voltage, so as to eliminate the overshot issue.Type: GrantFiled: June 14, 2017Date of Patent: July 9, 2019Assignee: Monolithic Power Systems, Inc.Inventors: Chao Liu, Lijie Jiang, Qian Ouyang, Xiaokang Wu
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Publication number: 20190207518Abstract: A control method of multi-phase converters, wherein the multi-phase converter includes a plurality of switching circuits coupled in parallel between an input voltage and a load. The control method includes: comparing a feedback signal with a reference signal to generate a comparison signal, wherein the feedback signal is indicative of an output voltage provided to the load; determining the number of switching circuits for power operation based on the load current; detecting a period of the comparison signal; comparing the detected period of the comparison signal with a time threshold to determine whether a transient rise of load current has occurred; and getting all the switching circuits into power operation if a transient rise of load current is detected.Type: ApplicationFiled: December 20, 2018Publication date: July 4, 2019Inventors: Xiaokang Wu, Lijie Jiang, Binci Xu
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Publication number: 20190199212Abstract: A DC-DC converter with droop regulation for better transient performance. The DC-DC converter includes a switching circuit, a comparison circuit and a logic control circuit. A differential voltage indicative of an output voltage of the switching circuit, and a droop voltage indicative of an output current of the switching circuit, are generated. A high-pass filtered signal is obtained by high-pass filtering the droop voltage. The comparison circuit responds to the differential voltage, a reference voltage and the high-pass filtered signal to generate a set signal. The logic control circuit generates a control signal based on the set signal to control the switching circuit.Type: ApplicationFiled: December 13, 2018Publication date: June 27, 2019Inventors: Lijie Jiang, Xiaokang Wu, Binci Xu
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Publication number: 20190129868Abstract: An auto-loop regulation system for a voltage regulator receives a plurality of pre-determined loop parameters through an interactive computing equipment, and the voltage regulator operates according to the plurality of pre-determined loop parameters, wherein the interactive computing equipment regulates at least one of the loop parameters automatically in real time according to an online loop value when the voltage regulator is operating online, and the interactive computing equipment keeps regulating the loop parameters until the online value of the voltage regulator matches with a target value.Type: ApplicationFiled: October 29, 2018Publication date: May 2, 2019Inventors: Lijie Jiang, Xiaokang Wu, Suhua Luo, Qian Ouyang
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Publication number: 20190068049Abstract: An over current protecting circuit, used with a switching converter having a switch, having: a current limiting circuit, configured to receive a limit indicating signal and to provide an on time signal to control an on time period of the switch based on the limit indicating signal, wherein if the limit indicating signal indicates a current flowing through the switch of the switching converter is larger than a limiting threshold, the on time period of a next switching cycle of the switch is subtracted with a first period, otherwise, the on time period of the switch of the next switching cycle is added with a second period; wherein a maximum on time period of the switch is fixed to be an on time reference.Type: ApplicationFiled: August 14, 2018Publication date: February 28, 2019Inventors: Xiaokang Wu, Qian Ouyang, Yu Zhang, Xiaogang Wei
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Publication number: 20180173286Abstract: An autonomous power system has a voltage regulator which converts an input voltage to an output voltage according to a reference voltage. A control method for the power system: receiving a voltage identification code sent by a processor; providing an autonomous voltage identification code when the voltage identification sent by the processor keeps constant during a first preset duration, wherein the autonomous voltage identification code can be updated self-adaptively; providing a reference voltage according to a sum of the voltage identification code and the autonomous identification code; and adjusting the output voltage according to the reference voltage.Type: ApplicationFiled: December 14, 2017Publication date: June 21, 2018Inventors: Reagan Luo, Qian Ouyang, Lijie Jiang, Marvin Ma, Xiaokang Wu
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Publication number: 20170288539Abstract: A DC-DC converter with transient control. The DC-DC converter includes a power switching circuit, a current to voltage converter, a PI circuit 403, a voltage to current converter 404 and a logic and control circuit 405. The DC-DC converter obtains the transient information of a current flowing through the power switching circuit, to slow down the variation of the output voltage, so as to eliminate the overshot issue.Type: ApplicationFiled: June 14, 2017Publication date: October 5, 2017Inventors: Chao Liu, Lijie Jiang, Qian Ouyang, Xiaokang Wu
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Control circuit for multiphase switching converter to reduce overshoot and associated control method
Patent number: 9660534Abstract: A multiphase switching converter having a plurality of switching circuits and a control circuit, the plurality of switching circuits provide an output voltage, the control circuit provides a plurality of switching control signals to turn ON the plurality of switching circuits successively based on the output voltage and a reference signal, when the output voltage is detected overshooting, the control circuit turns OFF a current switching circuit, and when the output voltage is detected recovering from overshooting, the control circuit turns ON the current switching circuit again for a first time period until a sum of the first time period and a second time period achieves a predetermined value, wherein the second time period is a time period the current switching circuit maintains ON uninterruptedly before the output voltage is detected overshooting.Type: GrantFiled: March 24, 2015Date of Patent: May 23, 2017Assignee: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Lijie Jiang, Xiaokang Wu, Suhua Luo, Qian Ouyang, Jinghai Zhou -
Publication number: 20170141680Abstract: The present invention discloses a DC-DC converter with constant on time control. The DC-DC converter includes a transient unit to obtain the transient information of a current flowing through a power switching circuit, to slow down the variation of the output voltage, so as to eliminate the overshot issue.Type: ApplicationFiled: November 4, 2016Publication date: May 18, 2017Inventors: Qian Ouyang, Xiaokang Wu, Lijie Jiang
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Patent number: 9479043Abstract: A control circuit for a switching converter having a comparison circuit, a synchronization unit, an ON-time control circuit and a logic unit, the comparison circuit provides a comparison signal based on a reference signal and an output signal of the switching converter, the synchronization unit provides a first synchronization signal and a second synchronization signal based on a first clock signal, a second clock signal and the comparison signal, the first synchronizing signal is generated by synchronizing the comparison signal with the first clock signal, the second synchronizing signal is generated by synchronizing the comparison signal with the second clock signal, the ON-time control circuit provides an ON-time control signal, the logic unit provides a switching control signal to control the switching converter based on the first synchronization signal, the second synchronization signal and the ON-time control signal.Type: GrantFiled: February 18, 2015Date of Patent: October 25, 2016Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.Inventors: Lijie Jiang, Xiaokang Wu, Suhua Luo, Qian Ouyang