Patents by Inventor Gangqiang Zhang

Gangqiang 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).

  • Patent number: 9748842
    Abstract: A system including a first power transistor including a gate, a second power transistor including a gate and connected in series with the first power transistor, wherein the connection between the transistors defines a switch node is disclosed. The system further includes a pulse width modulator (PWM) controller configured to assert control signals to the gates of the first and second power transistors, a high side sensing circuit coupled to the gate and a drain of the first power transistor. The system further includes a low side sensing circuit coupled to the gate and a drain of the second power transistor, and a track and hold circuit coupled to the high and low side sensing circuits and configured to couple sense signals from the high and low side sensing circuits.
    Type: Grant
    Filed: July 18, 2016
    Date of Patent: August 29, 2017
    Assignee: Texas Instruments Incorporated
    Inventors: Vijayalakshmi Devarajan, Gangqiang Zhang, Vaibhav Garg
  • Patent number: 9739811
    Abstract: An overcurrent detector that includes a sense transistor connected to a sense resistor, a second transistor matched to the sense transistor and connected in parallel to a second resistor, and a voltage comparator coupled to the sense transistor and second resistor. The sense transistor is configured to connect in a same gate and source connection with a driver output transistor. The second transistor and second resistor are configured to receive a current reference and generate a voltage reference. The voltage comparator is configured to compare the voltage reference with a voltage drop across the sense resistor.
    Type: Grant
    Filed: April 29, 2015
    Date of Patent: August 22, 2017
    Assignee: Texas Intruments Incorporated
    Inventor: Gangqiang Zhang
  • Publication number: 20150309087
    Abstract: An overcurrent detector that includes a sense transistor connected to a sense resistor, a second transistor matched to the sense transistor and connected in parallel to a second resistor, and a voltage comparator coupled to the sense transistor and second resistor. The sense transistor is configured to connect in a same gate and source connection with a driver output transistor. The second transistor and second resistor are configured to receive a current reference and generate a voltage reference. The voltage comparator is configured to compare the voltage reference with a voltage drop across the sense resistor.
    Type: Application
    Filed: April 29, 2015
    Publication date: October 29, 2015
    Inventor: Gangqiang ZHANG
  • Patent number: 7548117
    Abstract: A differential amplifier receives a differential input signal and generates an output signal at an output node. An auxiliary circuit coupled to the differential amplifier operates to improve slew rate response. In quiescent and small signal situations with respect to the differential input signal, the auxiliary circuit does not alter or change operation of the differential amplifier. However, in situations where a large signal change is experienced with respect to the differential input signal, the auxiliary circuit functions to speed up the sourcing and sinking current to/from the output node. A stability compensation capacitor coupled to the output node is accordingly more quickly charged or discharged and an improvement in slew rate performance of the differential amplifier is experienced.
    Type: Grant
    Filed: January 18, 2007
    Date of Patent: June 16, 2009
    Assignee: Shenzhen STS Microelectronics Co. Ltd.
    Inventors: Gangqiang Zhang, Fansheng Meng
  • Patent number: 7525350
    Abstract: A precise over-voltage comparator exhibits zero-waiting-current characteristics during normal working conditions. An NMOS transistor is used in conjunction with other circuit elements to regulate the over-voltage comparator. For normal power supply voltages, the comparator stays in standby status and does not consume quiescent current.
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: April 28, 2009
    Assignee: Shenzhen STS Microelectronics Co., Ltd.
    Inventors: Ni Zeng, Gangqiang Zhang
  • Publication number: 20080061844
    Abstract: A precise over-voltage comparator exhibits zero-waiting-current characteristics during normal working conditions. An NMOS transistor is used in conjunction with other circuit elements to regulate the over-voltage comparator. For normal power supply voltages, the comparator stays in standby status and does not consume quiescent current.
    Type: Application
    Filed: July 31, 2007
    Publication date: March 13, 2008
    Applicant: SHENZHEN STS MICROELECTRONICS CO., LTD.
    Inventors: Ni Zeng, Gangqiang Zhang
  • Publication number: 20070170993
    Abstract: A differential amplifier receives a differential input signal and generates an output signal at an output node. An auxiliary circuit coupled to the differential amplifier operates to improve slew rate response. In quiescent and small signal situations with respect to the differential input signal, the auxiliary circuit does not alter or change operation of the differential amplifier. However, in situations where a large signal change is experienced with respect to the differential input signal, the auxiliary circuit functions to speed up the sourcing and sinking current to/from the output node. A stability compensation capacitor coupled to the output node is accordingly more quickly charged or discharged and an improvement in slew rate performance of the differential amplifier is experienced.
    Type: Application
    Filed: January 18, 2007
    Publication date: July 26, 2007
    Applicant: STMicroelectronics, Inc.
    Inventors: Gangqiang Zhang, Fansheng Meng