Patents by Inventor Junming Zhang

Junming 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).

  • Publication number: 20250035824
    Abstract: An optical device for homogenizing and diffusing light, an emitting terminal and optical system are provided. An implementation of the optical device for homogenizing and diffusing light includes: a microlens array element, the microlens array element homogenizing and diffusing a light beam in a first direction, a second direction, or a first direction and a second direction, to form a homogeneous light beam, wherein the first direction and the second direction are perpendicular to each other.
    Type: Application
    Filed: July 24, 2024
    Publication date: January 30, 2025
    Inventors: Jia YANG, Chao XU, Junming ZHANG, Xiang LI, Hao ZHANG
  • Publication number: 20250015728
    Abstract: Disclosed is a flyback converter, a switch control circuit and a control method thereof. A driving current regulation circuit generates a current regulation trigger signal at active state correspondingly according to an operating state of the flyback converter. A switch control driving unit regulates a driving current of the first switch transistor according to the current regulation trigger signal at active state, thus a variation rate of a drain-source voltage across the first switch transistor is slowed down to a preset range. According to the present disclosure, when it is detected that the flyback converter is operating in discontinuous conduction mode or the drain-source voltage across the first switch transistor is high, a switching rate of the first switch transistor is controlled to avoid the voltage across a rectifier switch transistor on a secondary side of the flyback converter to undergo a large jump, and the system EMI is good.
    Type: Application
    Filed: July 2, 2024
    Publication date: January 9, 2025
    Inventors: Xianghua JIANG, Pitleong WONG, Xiangyong XU, Junming ZHANG
  • Publication number: 20240204674
    Abstract: Disclosed is a high-efficiency flyback converter and a control method thereof. The flyback converter comprises: a transformer; a first switch transistor and a second switch transistor; a resonant capacitor; a control circuit, for controlling the second switch transistor to be turned on for a first time before the first switch transistor is turned on during a switching cycle, controlling the second switch transistor to maintain turn-off state during a first time stage, to control energy transmission between primary and secondary sides to include two time stages during a switching cycle, the first time stage lasts for a set time period during a freewheeling process. The present disclosure allows the main switch transistor to realize zero-voltage turn-on, thus reducing conduction loss of the primary and the secondary sides, reducing ripples of an output voltage and a current of the secondary side, and being beneficial to improving operating efficiency.
    Type: Application
    Filed: December 18, 2023
    Publication date: June 20, 2024
    Inventors: Xianghua JIANG, Junming ZHANG, Pitleong WONG, Xiangyong XU
  • Publication number: 20240186909
    Abstract: Disclosed is a soft switch control circuit and a flyback converter, comprising a primary edge part and a secondary edge part, and obtaining a trigger pulse signal according to a pre-turning on signal of a main switch transistor before the main switch transistor is turned on. The trigger pulse signal is transmitted to the secondary edge part by an isolation module to control the switch at a secondary edge circuit to conduct, to reduce source-drain voltage of the main switch circuit of the primary edge, to make the main switch transistor to turn on when the source-drain voltage is near zero voltage. The switch of the secondary edge circuit is a synchronous rectifying switch transistor or a discharge switch transistor connected at two ends of the synchronous rectifying switch transistor.
    Type: Application
    Filed: December 1, 2023
    Publication date: June 6, 2024
    Applicant: Joulwatt Technology Co., Ltd.
    Inventors: Junming ZHANG, Xianghua JIANG, Xiangyong XU, Pitleong WONG
  • Publication number: 20240145861
    Abstract: The energy storage module of the battery pack is located in the housing, the heat insulation panel is located between the energy storage module and the housing, the heat insulation panel includes a heat insulation layer and an outer packaging layer. The outer packaging layer wraps the outside of the heat insulation layer and compresses a thickness of the elastic heat, insulation layer, and a ventilation channel is formed between the heat insulation panel and the energy storage module. The outer packaging layer is configured to release compression of the elastic heat insulation layer when the energy storage module reaches a thermal runaway temperature, and the heat insulation panel is filled between the housing and the energy storage module, thereby slowing down a speed at which heat passes through a side panel and spreads to the outside of the battery pack along the ventilation channel.
    Type: Application
    Filed: October 27, 2023
    Publication date: May 2, 2024
    Inventors: Yunxiang Xu, Jing Zhu, Huan Zhang, Yongling Wang, Junming Zhang
  • Publication number: 20240120831
    Abstract: Disclosed is a protection circuit of a flyback converter and a control method. The protection circuit comprises: an active discharge module, connected to at least one end of a first capacitor in a resonance circuit of the flyback converter to provide a discharge path, and controlling turning-on and turning-off of the discharge path according to the discharge enable signal; in a normal work state, the discharge path is disconnected, the first capacitor works as a resonance capacitor; before the flyback converter is restarted, the discharge path is turned on for a predetermined time period to release charges of the first capacitor, a resonance current after the flyback converter is restarted is reduced to a safe work current of the second switch transistor. Charges stored in the first capacitor can be discharged to release before the flyback converter is restarted to reduce the resonance current and enhance system stability and security.
    Type: Application
    Filed: September 29, 2023
    Publication date: April 11, 2024
    Applicant: Joulwatt Technology Co., Ltd.
    Inventors: Xianghua JIANG, Junming ZHANG, PITLEONG WONG, XIANGYONG XU
  • Publication number: 20240120849
    Abstract: Disclosed is a protection circuit of a flyback converter and a control method. The protection circuit comprises: an active discharge module, for providing a discharge path between a first current terminal and a second current terminal of a switch transistor in a resonance circuit, and controlling turning-on and turning-off of the discharge path according to a discharge enable signal; in the normal work state of the flyback converter, the discharge path is disconnected, the resonance circuit works, before the flyback converter is restarted, the discharge path is turned on for a predetermined time period to release charges stored in the resonance circuit, and the resonance current after the flyback converter is restarted is reduced to the safe work current of the second switch transistor. The resonance current is discharged before the flyback converter is restarted, thus reducing the resonance current and enhancing system stability and security.
    Type: Application
    Filed: September 29, 2023
    Publication date: April 11, 2024
    Applicant: Joulwatt Technology Co., Ltd.
    Inventors: Xianghua JIANG, Junming ZHANG, PITLEONG WONG, XIANGYONG XU
  • Patent number: 11671019
    Abstract: A bridge circuit with series-connected switches and associated control method. The bridge circuit has a first bridge arm and a second bridge arm coupled to a common node, the first bridge arm has a plurality of series-connected first main switches, each first main switch is coupled in parallel with an auxiliary module, each first auxiliary module has a clamping capacitor and an auxiliary switch, the first bridge arm receives a first main switch signal to control the plurality of series-connected first main switches, the second bridge arm receives a second main switch signal, the control method is sensing voltages of the clamping capacitors in the first bridge arm, correspondingly generating voltage sensing signals, and turning on at least one auxiliary switch for a predetermined time during a dead time according to a sorting result of the voltage sensing signals.
    Type: Grant
    Filed: July 14, 2021
    Date of Patent: June 6, 2023
    Assignee: ZHEJIANG UNIVERSITY
    Inventors: Shuai Shao, Jianjia Zhang, Zhi Gao, Yucen Li, Junming Zhang, Kuang Sheng
  • Publication number: 20230109722
    Abstract: A switching mode power supply with zero voltage switching is discussed. It adopts a first secondary signal generator and a second secondary signal generator to control a secondary switch circuit to be turned on once again after a current freewheeling process is over.
    Type: Application
    Filed: February 23, 2021
    Publication date: April 13, 2023
    Inventors: Junming Zhang, Zhen Zhang
  • Publication number: 20220221517
    Abstract: The present invention discloses a high-precision battery model parameter identification method and system based on output response reconstruction. The method includes: determining a pulse function based on a relationship between a measured voltage signal and a true voltage signal and a relationship between the true voltage signal and a current excitation signal; reconstructing a voltage signal based on the pulse function and the current excitation signal; and obtaining equivalent circuit model parameters of a battery based on the reconstructed voltage signal and the current excitation signal. The present invention has the following beneficial effects: the reconstructed output signal has good authenticity, and the precision of parameter identification is high. Since a complex tuning process of the filter is removed, a parameter identification process is more concise and clearer.
    Type: Application
    Filed: May 28, 2020
    Publication date: July 14, 2022
    Applicant: SHANDONG UNIVERSITY
    Inventors: Chenghui ZHANG, Fazheng WEN, Bin DUAN, Rui ZHU, Junming ZHANG
  • Publication number: 20220146638
    Abstract: A multi-point scanning lidar is disclosed, including at least one laser emitting end for emitting laser light, a scanning device, at least one light path transmission mechanism and a laser receiving end. The scanning device forms at least one light guide surface for transmitting the laser light to at least one target object. The light path transmission mechanism is arranged between the laser emitting end and the scanning device. The scanning device is arranged on a laser light path in such a manner that the light guide surface successively transmits the laser light to different parts of the target object. The laser light path is a path on which the laser light is transmitted to the target object via the light path transmission mechanism, wherein the laser receiving end receives and analyzes the laser light reflected by the target object.
    Type: Application
    Filed: April 17, 2020
    Publication date: May 12, 2022
    Applicant: NINGBO SUNNY AUTOMOTIVE OPTECH CO., LTD.
    Inventors: Junming ZHANG, Chao XU, Jia YANG, Yanting CAO
  • Publication number: 20220038010
    Abstract: A bridge circuit with series-connected switches and associated control method. The bridge circuit has a first bridge arm and a second bridge arm coupled to a common node, the first bridge arm has a plurality of series-connected first main switches, each first main switch is coupled in parallel with an auxiliary module, each first auxiliary module has a clamping capacitor and an auxiliary switch, the first bridge arm receives a first main switch signal to control the plurality of series-connected first main switches, the second bridge arm receives a second main switch signal, the control method is sensing voltages of the clamping capacitors in the first bridge arm, correspondingly generating voltage sensing signals, and turning on at least one auxiliary switch for a predetermined time during a dead time according to a sorting result of the voltage sensing signals.
    Type: Application
    Filed: July 14, 2021
    Publication date: February 3, 2022
    Inventors: Shuai SHAO, Jianjia ZHANG, Zhi GAO, Yucen LI, Junming ZHANG, Kuang SHENG
  • Patent number: 10505442
    Abstract: The present invention provides a synchronous rectification control circuit, a method and a flyback switching circuit. A drive circuit outputs a drive signal to control the turn-on and turn-off of a synchronous rectification transistor; a threshold comparison circuit controls the drive circuit to output a pull-up drive signal to turn on the synchronous rectification transistor when a drain-source voltage is lower than a preset low threshold voltage and controls the drive circuit to output a pull-down drive signal to turn off the synchronous rectification transistor when the drain-source voltage is higher than or equal to a preset high threshold voltage; a voltage regulation control circuit controls the drive circuit to output a drive signal for pulling up a voltage of the drive signal to a preset pull-up voltage high value when the drain-source voltage is lower than a preset voltage regulation reference value.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: December 10, 2019
    Assignee: JOULWATT TECHNOLOGY (HANGZHOU) CO., LTD.
    Inventors: Pitleong Wong, Yuancheng Ren, Xunwei Zhou, Junming Zhang, Yiqing Jin
  • Patent number: 10506684
    Abstract: A protection circuit and an illumination driving circuit are described herein. The protection circuit comprises a detection circuit, detecting a current flowing through a first switch to obtain a current detection signal and determining whether there is leakage at an input terminal according to the current detection signal; a control circuit, controlling the first switch to switch on intermittently, detecting the current flowing through the first switch by the detection circuit during a switch-on period of the first switch, and keeping the load at a disconnection state if the detection circuit determines there is leakage; and the first switch, connected to the input terminal, and a control terminal of the first switch being connected to the control circuit, and the first switch being controlled by the control circuit to be switched on intermittently. The present invention has the protection function and enhances safety during load removing and installation processes.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: December 10, 2019
    Assignee: JOULWATT TECHNOLOGY (HANGZHOU) CO., LTD.
    Inventors: Junming Zhang, Guoqiang Liu, Pitleong Wong, Yuancheng Ren, Xunwei Zhou
  • Patent number: 10153684
    Abstract: The present invention discloses a bleeder circuit; solutions of the present invention may be applied in linear driving and switch driving solutions; a threshold voltage is a zero crossing value, and when the input voltage is zero crossing, the load current at this time is zero; a bleeder current is generated to make the input current greater than a holding current of a TRIAC dimmer, to maintain turning-on of the TRIAC dimmer, and a second time is set as a delay time, which reduces power consumption. In the application of switch driving solution, the current regulating circuit is controlled to be enabled according to the waveform features of the previous and latter halves of periods of the sine wave as well as the size of the input current of the driving circuit.
    Type: Grant
    Filed: December 30, 2016
    Date of Patent: December 11, 2018
    Assignee: Joulwatt Technology (Hangzhou) Co., Ltd.
    Inventors: Guoqiang Liu, Bai Lang, Junming Zhang, Pitleong Wong, Yuancheng Ren, Xunwei Zhou
  • Patent number: 10135330
    Abstract: A control circuit for a power converter can include: a current detection circuit configured to generate a current detection signal that represents an input current; a control signal generator configured to generate a switching control signal such that the current detection signal is directly proportional to a voltage conversion function; and a power stage circuit of the power converter being controlled by the switching control signal, where the voltage conversion function is a ratio of an input voltage and an output voltage of the power converter.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: November 20, 2018
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Junming Zhang, Chen Zhao
  • Publication number: 20180241195
    Abstract: A protection circuit and an illumination driving circuit are described herein. The protection circuit comprises a detection circuit, detecting a current flowing through a first switch to obtain a current detection signal and determining whether there is leakage at an input terminal according to the current detection signal; a control circuit, controlling the first switch to switch on intermittently, detecting the current flowing through the first switch by the detection circuit during a switch-on period of the first switch, and keeping the load at a disconnection state if the detection circuit determines there is leakage; and the first switch, connected to the input terminal, and a control terminal of the first switch being connected to the control circuit, and the first switch being controlled by the control circuit to be switched on intermittently. The present invention has the protection function and enhances safety during load removing and installation processes.
    Type: Application
    Filed: April 21, 2017
    Publication date: August 23, 2018
    Applicant: JOULWATT TECHNOLOGY (HANGZHOU) CO., LTD.
    Inventors: Junming ZHANG, Guoqiang LIU, Pitleong WONG, Yuancheng REN, Xunwei ZHOU
  • Publication number: 20180115234
    Abstract: The present invention discloses a bleeder circuit; solutions of the present invention may be applied in linear driving and switch driving solutions; a threshold voltage is a zero crossing value, and when the input voltage is zero crossing, the load current at this time is zero; a bleeder current is generated to make the input current greater than a holding current of a TRIAC dimmer, to maintain turning-on of the TRIAC dimmer, and a second time is set as a delay time, which reduces power consumption. In the application of switch driving solution, the current regulating circuit is controlled to be enabled according to the waveform features of the previous and latter halves of periods of the sine wave as well as the size of the input current of the driving circuit.
    Type: Application
    Filed: December 30, 2016
    Publication date: April 26, 2018
    Applicant: JOULWATT TECHNOLOGY (HANGZHOU) CO., LTD.
    Inventors: Guoqiang LIU, Bai LANG, Junming ZHANG, Pitleong WONG, Yuancheng REN, Xunwei ZHOU
  • Publication number: 20180091040
    Abstract: The present invention provides a synchronous rectification control circuit, a method and a flyback switching circuit. A drive circuit outputs a drive signal to control the turn-on and turn-off of a synchronous rectification transistor; a threshold comparison circuit controls the drive circuit to output a pull-up drive signal to turn on the synchronous rectification transistor when a drain-source voltage is lower than a preset low threshold voltage and controls the drive circuit to output a pull-down drive signal to turn off the synchronous rectification transistor when the drain-source voltage is higher than or equal to a preset high threshold voltage; a voltage regulation control circuit controls the drive circuit to output a drive signal for pulling up a voltage of the drive signal to a preset pull-up voltage high value when the drain-source voltage is lower than a preset voltage regulation reference value.
    Type: Application
    Filed: September 28, 2017
    Publication date: March 29, 2018
    Applicant: JOULWATT TECHNOLOGY (HANGZHOU) CO., LTD.
    Inventors: Pitleong WONG, Yuancheng REN, Xunwei ZHOU, Junming ZHANG, Yiqing JIN
  • Patent number: D986432
    Type: Grant
    Filed: November 26, 2021
    Date of Patent: May 16, 2023
    Assignee: Shenzhen Jianyi Life Technology Co., Ltd.
    Inventor: Junming Zhang