Patents by Inventor Ching-Sheng Li

Ching-Sheng Li 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: 20130162187
    Abstract: A method for adjusting rotational speed of a motor is also disclosed. The method includes determining whether an input voltage of the motor enters into a predetermined voltage range; generating a pulse width modulation signal when the input voltage of the motor enters into the predetermined voltage range; and driving the motor to rotate according to the pulse width modulation signal.
    Type: Application
    Filed: February 16, 2012
    Publication date: June 27, 2013
    Inventors: Ming-Jung Tsai, Jyun-Ping Jiang, Ching-Sheng Li, Kun-Min Chen
  • Patent number: 8441243
    Abstract: Power control circuit with reducing noise and switching loss includes a first gate driver for driving a first switch, an additional gate driver for driving the first switch, and a managing circuit for controlling the first and the additional gate driver to drive the first switch according to a switching signal and turning off the additional gate driver according to a switching voltage on a first end of the first switch, wherein the first end of the first switch is coupled to a load, second end of the first switch is coupled to an input power source, a third end of the first switch is coupled to the first and the additional gate drivers.
    Type: Grant
    Filed: February 10, 2011
    Date of Patent: May 14, 2013
    Assignee: Anpec Electronics Corporation
    Inventors: Kun-Min Chen, Ke-Tsung Chen, Ching-Sheng Li, Ming-Jung Tsai
  • Publication number: 20130099709
    Abstract: A circuit protection method for a motor control circuit includes determining whether the motor control circuit complies with an operating condition when the motor control circuit is in a start mode, a lock mode or a restart mode, and modulating a current outputted from the motor control circuit when the motor control circuit complies with the operating condition.
    Type: Application
    Filed: December 13, 2011
    Publication date: April 25, 2013
    Inventors: Ming-Jung Tsai, Kun-Min Chen, Ching-Sheng Li
  • Publication number: 20130093373
    Abstract: The present invention discloses a motor driving circuit for driving a motor, including an electrostatic discharge diode, having an input port and an output port coupled to a first DC power supply, a pulse width modulation source coupled to the input port of the electrostatic discharge diode to generate a pulse width modulation signal, and a driving module including a voltage detecting module comparing the pulse width modulation signal with a voltage of the output port of the electrostatic discharge diode to generate a voltage comparison result, a lock/restart module generating a shut-down signal according to the voltage comparison result, a control module generating a control signal according to the shut-down signal, and a bridge circuit switching the motor on or off by turning on or turning off an up-bridge circuit and a down-bridge circuit according to the control signal.
    Type: Application
    Filed: November 20, 2011
    Publication date: April 18, 2013
    Inventors: Kun-Min Chen, Ming-Jung Tsai, Ching-Sheng Li
  • Patent number: 8395343
    Abstract: A rotation speed control circuit for controlling a rotation speed of a fan includes: a rotation speed detector, for generating a rotation speed voltage according to a rotation speed signal corresponding to the rotation speed; a sample and hold element, coupled to the rotation speed detector, for sampling and storing the rotation speed voltage; an error amplifier, coupled to the sample and hold element, for controlling a voltage of a filter capacitor according to the rotation speed voltage and a reference voltage, to adjust an error voltage; and a pulse width modulation signal generator, coupled to the filter capacitor, for generating a pulse width modulation signal according to the error voltage and a triangle wave.
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: March 12, 2013
    Assignee: Anpec Electronics Corporation
    Inventors: Ming-Jung Tsai, Kun-Min Chen, Ching-Sheng Li, Sung-Ming Lai
  • Publication number: 20120280642
    Abstract: The present invention discloses a start-up circuit for a motor driving IC. The activation circuit includes a determination unit, for generating a determination result indicating an operating mode of the motor driving IC according to an external pulse width modulation signal, and an output unit, for outputting an activation signal according to the determination result and a pulse width modulation activation signal. A duty of the pulse width modulation activation signal is greater than a duty of the external pulse width modulation signal.
    Type: Application
    Filed: August 8, 2011
    Publication date: November 8, 2012
    Inventors: Ying-Chen Lin, Kun-Min Chen, Ching-Sheng Li, Chia-Tai Yang, Ching-Shan Lu
  • Publication number: 20120274411
    Abstract: The present invention discloses a pulse width modulation driving IC. The pulse width modulation driving IC includes a first pin, for receiving a first signal, a second pin, for receiving a second signal, a comparing unit, for comparing the first signal with a reference voltage, to generate a comparison result indicating a operating mode of the pulse width modulation driving IC, and an output unit, for outputting a pulse width modulation output signal according to the first signal, the second signal and the comparison result.
    Type: Application
    Filed: June 29, 2011
    Publication date: November 1, 2012
    Inventors: Chia-Tai Yang, Yi-Cheng Liu, Ching-Sheng Li, Kun-Min Chen, Ching-Shan Lu
  • Publication number: 20120176111
    Abstract: Power control circuit with reducing noise and switching loss includes a first gate driver for driving a first switch, an additional gate driver for driving the first switch, and a managing circuit for controlling the first and the additional gate driver to drive the first switch according to a switching signal and turning off the additional gate driver according to a switching voltage on a first end of the first switch, wherein the first end of the first switch is coupled to a load, second end of the first switch is coupled to an input power source, a third end of the first switch is coupled to the first and the additional gate drivers.
    Type: Application
    Filed: February 10, 2011
    Publication date: July 12, 2012
    Inventors: Kun-Min Chen, Ke-Tsung Chen, Ching-Sheng Li, Ming-Jung Tsai
  • Patent number: 8183807
    Abstract: A motor driving method for driving a direct-current (DC) motor, designed for avoiding a reverse current induced by the Back Electromotive Force (BEMF), includes providing a driver circuit for driving the DC motor; comparing a signal level of a terminal of the DC motor and a predetermined voltage value to produce a comparing result; and controlling a specific lower gate switch to avoid the occurrence of a reverse current of the DC motor according to the comparing result.
    Type: Grant
    Filed: December 28, 2009
    Date of Patent: May 22, 2012
    Assignee: Anpec Electronics Corporation
    Inventors: Ming-Jung Tsai, Ching-Sheng Li, Kun-Min Chen
  • Patent number: 8174226
    Abstract: A control method of a current limit of a DC motor includes generating a reference voltage according to a preset current limit value of a DC motor; comparing the reference voltage with the voltage drop of a power control switch which drives the DC motor to generate a compare result; and controlling the power delivered to the DC motor according to the compare result in order to limit the current of the DC motor.
    Type: Grant
    Filed: July 30, 2009
    Date of Patent: May 8, 2012
    Assignee: Anpec Electronics Corporation
    Inventors: Ming-Jung Tsai, Ching-Sheng Li, Kun-Min Chen
  • Patent number: 8157536
    Abstract: A rotating speed adjustment circuit for a heat dissipation fan includes a first node, a second node, a reception end for receiving a first control signal, a first resistor coupled to a voltage source and the first node, a second resistor coupled to the first node and the second node, a third resistor coupled to the second node and a ground end, a capacitor coupled to the first node and the ground end, a transistor coupled to the reception end, the second node and the ground end, an oscillator for generating an oscillating signal, and a comparator for comparing a signal of the first node and the oscillating signal, so as to output a second control signal to control a rotating speed of the heat dissipation fan.
    Type: Grant
    Filed: December 24, 2008
    Date of Patent: April 17, 2012
    Assignee: Anpec Electronics Corporation
    Inventors: Tzu-Cheng Teng, Ching-Sheng Li, Ming-Jung Tsai, Shen-Min Lo
  • Patent number: 8154233
    Abstract: A sensorless method for starting a three-phase brushless direct-current motor includes generating a start-up control signal, a start mode selection signal, and a control signal commutation period; switching to a start mode according to the start mode selection signal; implementing a position aligning procedure according to the start-up control signal and the control signal commutation period; detecting a zero crossing point of back electromotive forces during each control signal commutation period; outputting a sensorless mode selection signal while detecting the zero crossing points of the back electromotive forces during consecutive control signal commutation periods; switching to a sensorless mode according to the sensorless mode selection signal; and detecting a zero crossing point of back electromotive forces in the sensorless mode to determine a starting result of the three-phase brushless direct-current motor.
    Type: Grant
    Filed: December 4, 2008
    Date of Patent: April 10, 2012
    Assignee: Anpec Electronics Corporation
    Inventors: Chia-Tai Yang, Ching-Sheng Li, Kun-Min Chen, Tzu-Cheng Teng
  • Publication number: 20120007526
    Abstract: A rotation speed control circuit for controlling a rotation speed of a fan includes: a rotation speed detector, for generating a rotation speed voltage according to a rotation speed signal corresponding to the rotation speed; a sample and hold element, coupled to the rotation speed detector, for sampling and storing the rotation speed voltage; an error amplifier, coupled to the sample and hold element, for controlling a voltage of a filter capacitor according to the rotation speed voltage and a reference voltage, to adjust an error voltage; and a pulse width modulation signal generator, coupled to the filter capacitor, for generating a pulse width modulation signal according to the error voltage and a triangle wave.
    Type: Application
    Filed: October 20, 2010
    Publication date: January 12, 2012
    Inventors: Ming-Jung Tsai, Kun-Min Chen, Ching-Sheng Li, Sung-Ming Lai
  • Patent number: 8080955
    Abstract: A driving method for a motor includes sensing variation of magnetic pole of a rotator of the motor, to generate a magnetic pole sensing signal, determining dead zone of the motor according to the magnetic pole sensing signal, to generate a determination result, and adjusting voltage outputted to a coil of the rotator according to the determination result.
    Type: Grant
    Filed: June 1, 2009
    Date of Patent: December 20, 2011
    Assignee: Anpec Electronics Corporation
    Inventors: Kun-Min Chen, Ming-Jung Tsai, Sung-Ming Lai, Ching-Sheng Li, Ching-Shan Lu
  • Patent number: 8063601
    Abstract: A motor driving circuit for adjusting speed of the motor by changing output voltage is disclosed. One end of the motor is coupled to a variable voltage source. The motor driving circuit includes a motor-driving unit, a control unit and a determining unit. The motor-driving unit includes a first end coupled to another end of the motor, a second end coupled to a ground and a third end, and is utilized for driving the motor. The control unit is utilized for controlling the voltage between the first end and the third end of the motor-driving unit. The determining unit is coupled between the variable voltage source and the control unit, and is utilized for controlling the control unit to adjust the voltage between the first end and the third end of the motor-driving unit according to magnitude of the voltage of the variable voltage source.
    Type: Grant
    Filed: October 20, 2008
    Date of Patent: November 22, 2011
    Assignee: Anpec Electronics Corporation
    Inventors: Ke-Min Chen, Ching-Sheng Li, Kun-Min Chen, Shen-Min Lo, Ching-Shan Lu
  • Patent number: 8013557
    Abstract: A motor protection device includes a detection unit for detecting an operating state of a motor and outputting a detection signal; a reference unit for generating a variable reference signal; a discriminating unit for comparing the detection signal with the variable reference signal to discriminate whether the motor is in an abnormal condition; and a protection unit that receives a result of discrimination from the discriminating unit and limits a driving current for the motor when the motor is in an abnormal condition. The motor protection device is characterized in that the reference unit adjusts the variable reference signal according to a motor rotation detection signal, so that the motor rotation detection signal and the detection signal are used synchronously in discriminating whether the motor is in an abnormal condition, and the motor in an abnormal condition may be doubly protected.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: September 6, 2011
    Assignee: Anpec Electronics Corporation
    Inventor: Ching-Sheng Li
  • Patent number: 7940107
    Abstract: An inrush voltage clamping circuit for an electronic device for clamping an inrush voltage induced by hot plugging is disclosed. The clamp circuit includes a buffer unit and a clamp unit. The buffer unit is coupled to an input power end for receiving an inrush current of the inrush voltage. The clamp unit is coupled to the input power end and the buffer unit for controlling the buffer unit to receive the inrush current according to an input voltage of the input power end.
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: May 10, 2011
    Assignee: Anpec Electronics Corporation
    Inventors: Kun-Min Chen, Tzu-Cheng Teng, Ming-Jung Tsai, Ching-Sheng Li
  • Publication number: 20110062910
    Abstract: A motor driving method for driving a direct-current (DC) motor, designed for avoiding a reverse current induced by the Back Electromotive Force (BEMF), includes providing a driver circuit for driving the DC motor; comparing a signal level of a terminal of the DC motor and a predetermined voltage value to produce a comparing result; and controlling a specific lower gate switch to avoid the occurrence of a reverse current of the DC motor according to the comparing result.
    Type: Application
    Filed: December 28, 2009
    Publication date: March 17, 2011
    Inventors: Ming-Jung Tsai, Ching-Sheng Li, Kun-Min Chen
  • Publication number: 20100253259
    Abstract: A driving method for a motor includes sensing variation of magnetic pole of a rotator of the motor, to generate a magnetic pole sensing signal, determining dead zone of the motor according to the magnetic pole sensing signal, to generate a determination result, and adjusting voltage outputted to a coil of the rotator according to the determination result.
    Type: Application
    Filed: June 1, 2009
    Publication date: October 7, 2010
    Inventors: Kun-Min Chen, Ming-Jung Tsai, Sung-Ming Lai, Ching-Sheng Li, Ching-Shan Lu
  • Publication number: 20100244757
    Abstract: A control method of a current limit of a DC motor includes generating a reference voltage according to a preset current limit value of a DC motor; comparing the reference voltage with the voltage drop of a power control switch which drives the DC motor to generate a compare result; and controlling the power delivered to the DC motor according to the compare result in order to limit the current of the DC motor.
    Type: Application
    Filed: July 30, 2009
    Publication date: September 30, 2010
    Inventors: Ming-Jung Tsai, Ching-Sheng Li, Kun-Min Chen