Patents by Inventor Zefeng Wei

Zefeng Wei 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: 20250122679
    Abstract: A high-pressure cleaning device includes a carrier, a power unit, a valve assembly, a high-pressure water gun and a floor brush. The power unit is mounted on the carrier. The power unit includes a pump. The valve assembly is mounted on the carrier. The valve assembly includes a liquid inlet, a first liquid outlet and a second liquid outlet. The liquid inlet is in communication with an outlet of the pump. The high-pressure water gun is in communication with the first liquid outlet through a pipeline. The floor brush is mounted on a bottom of the carrier. The floor brush includes a nozzle assembly. The nozzle assembly is in communication with the second liquid outlet through a pipeline. The valve assembly is configured to be switchable between at least two of the following positions, include position one and position two.
    Type: Application
    Filed: October 11, 2024
    Publication date: April 17, 2025
    Inventors: Yin Chen, Yingtang Ling, Chunlin Zhao, Jun Zhang, Zefeng Wei, Xiuzhen Wu, Yaqing Jing, Hailong Huang
  • Publication number: 20240275197
    Abstract: The present application provides power supply control circuits, power tools, and power tool systems. The power supply control circuit includes: a main control chip module connected to battery packs; control circuits connected in parallel and connected to the main control chip module and provided on a power supply path from the battery pack to a power tool to control connection and disconnection of the battery packs; and a voltage detection circuit connected to the power supply path and the main control chip module. The main control chip module controls the connection and disconnection of the battery packs through the control circuit based on feedback from the voltage detection circuit, and when the voltage detection circuit detects that the voltage of a currently connected battery pack is less than a predetermined value, controls the currently connected battery pack to be disconnected and select the other battery pack to be connected.
    Type: Application
    Filed: February 4, 2024
    Publication date: August 15, 2024
    Applicant: Greenworks (Jiangsu) Co., Ltd.
    Inventors: Zefeng WEI, Biao LI
  • Patent number: 12000873
    Abstract: The disclosure provides a power tool, a detection circuit and a detection method of a load state thereof. The detection circuit of the power tool includes: a main control unit, a sampling resistor, a voltage sampling unit and an alarm display unit. The sampling resistor is arranged on a driving loop of a motor. The voltage sampling unit is used to sample a voltage across the sampling resistor. The alarm display unit is connected with the main control unit. The main control unit is configured to control the alarm display unit to execute a preset display state according to a voltage signal across the sampling resistor sampled by the voltage sampling unit.
    Type: Grant
    Filed: March 3, 2022
    Date of Patent: June 4, 2024
    Assignee: Globe (Jiangsu) Co., Ltd.
    Inventors: Zefeng Wei, Biao Li, Xian Zhuang
  • Patent number: 11909242
    Abstract: The invention discloses a high-voltage driver switch system and switching method. The system includes a main control chip module and an energy storage capacitor connected with a battery pack, a drive circuit module, a pre-charge circuit and a charge circuit for charging the energy storage capacitor. The pre-charge circuit is connected with the main control chip module and has a current limit resistor, so as to pre-charge the energy storage capacitor under the control of the main control chip module. The charge circuit is connected with the main control chip module and has an electronic switch module which includes two ends connected respectively with the battery pack and the energy storage capacitor, the battery pack charges the energy storage capacitor when switched-on. The invention reduces the instantaneous start-up current and avoids a high current impact caused by charging the energy storage capacitor by the battery pack directly.
    Type: Grant
    Filed: December 14, 2020
    Date of Patent: February 20, 2024
    Assignee: Globe (Jiangsu) Co., Ltd
    Inventors: Zefeng Wei, Biao Li
  • Publication number: 20220291261
    Abstract: The disclosure provides a power tool, a detection circuit and a detection method of a load state thereof. The detection circuit of the power tool includes: a main control unit, a sampling resistor, a voltage sampling unit and an alarm display unit. The sampling resistor is arranged on a driving loop of a motor. The voltage sampling unit is used to sample a voltage across the sampling resistor. The alarm display unit is connected with the main control unit. The main control unit is configured to control the alarm display unit to execute a preset display state according to a voltage signal across the sampling resistor sampled by the voltage sampling unit.
    Type: Application
    Filed: March 3, 2022
    Publication date: September 15, 2022
    Applicant: Globe (Jiangsu) Co., Ltd.
    Inventors: Zefeng Wei, Biao Li, Xian Zhuang
  • Publication number: 20210184483
    Abstract: The invention discloses a high-voltage driver switch system and switching method. The system includes a main control chip module and an energy storage capacitor connected with a battery pack, a drive circuit module, a pre-charge circuit and a charge circuit for charging the energy storage capacitor. The pre-charge circuit is connected with the main control chip module and has a current limit resistor, so as to pre-charge the energy storage capacitor under the control of the main control chip module. The charge circuit is connected with the main control chip module and has an electronic switch module which includes two ends connected respectively with the battery pack and the energy storage capacitor, the battery pack charges the energy storage capacitor when switched-on. The invention reduces the instantaneous start-up current and avoids a high current impact caused by charging the energy storage capacitor by the battery pack directly.
    Type: Application
    Filed: December 14, 2020
    Publication date: June 17, 2021
    Inventors: Zefeng Wei, Biao Li