Patents by Inventor Chih Yueh Yen

Chih Yueh Yen 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: 9750099
    Abstract: A light emitting device with low voltage-endurance components includes a light emitting diode string, M first control circuits, a detection unit and a current control circuit. The light emitting diode string includes M first light emitting diodes connected in series. Each first control circuit includes a first switch. One end of the light emitting string is coupled to a node of an input voltage. The first switch is connected to its related first light emitting diode in parallel and can enable a bypass current path. The detection unit detects the potential of the input voltage to produce a current detection signal. The current control circuit is coupled to the M-th one of the M first control circuits and the detection unit and controls the M-th one of the M first control circuits to selectively enable the bypass current path according to the current detection signal.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: August 29, 2017
    Assignee: TM TECHNOLOGY, INC
    Inventors: Kuo-Tso Chen, Chi-Cheng Chao, Chih-Yueh Yen
  • Publication number: 20160374166
    Abstract: A light emitting device with low voltage-endurance components includes a light emitting diode string, M pieces of first control circuit, a detection unit and a current control circuit. The light emitting diode string includes M pieces of first light emitting diode connected in series. Each first control circuit includes a first switch. One end of the light emitting string is coupled to a node of an input voltage. The first switch is connected to its related first light emitting diode in parallel and can enable a bypass current path. The detection unit detects the potential of the input voltage to produce a current detection signal. The current control circuit is coupled to the M-th piece of the first control circuits and the detection unit and controls the M-th piece of the first control circuits to selectively enable the bypass current path according to the current detection signal.
    Type: Application
    Filed: June 17, 2016
    Publication date: December 22, 2016
    Applicant: TM TECHNOLOGY, INC
    Inventors: Kuo-Tso CHEN, Chi-Cheng CHAO, Chih-Yueh YEN
  • Patent number: 8274268
    Abstract: A control circuit comprises a PWM control circuit and a PWM skip control circuit. The PWM control circuit controls a switching circuit. The switching circuit acts as a current source for an output circuit and a load circuit. The PWM skip control circuit controls the operation of the PWM control circuit. When the output current of the switching circuit is below a predetermined threshold, the PWM skip control circuit stops the operation of the PWM control circuit. When the output voltage of the switching circuit is below a predetermined threshold, the PWM skip control circuit resumes the operation of the PWM control circuit.
    Type: Grant
    Filed: August 13, 2008
    Date of Patent: September 25, 2012
    Assignee: Advanced Analog Technology, Inc.
    Inventor: Chih Yueh Yen
  • Publication number: 20100164462
    Abstract: A DC-DC converter includes a switch circuit, a feedback circuit, an error amplifier, a soft-start circuit, and a signal modulation circuit. The switch circuit receives an input voltage and charges/discharges an inductor based on a switch control signal, thereby providing an output voltage. The feedback circuit provides a corresponding feedback voltage based on the output voltage. The error amplifier generates a comparing voltage based on the feedback voltage and a reference voltage. The soft-start circuit provides a ramp clamping voltage, which is outputted as the comparing voltage when the comparing voltage is larger than the ramp clamping voltage. The signal modulation circuit generates the switch control signal based on the comparing signal and a periodic signal.
    Type: Application
    Filed: January 20, 2009
    Publication date: July 1, 2010
    Inventors: Chih-Yueh Yen, Cheng-Kuang Lin
  • Patent number: 7705569
    Abstract: A slope rate compensation circuit includes a source follower level-shift amplifier, a capacitor, a first resistor and a second resistor. The source follower level-shift amplifier includes a first transistor and a second transistor. The first transistor allows a first current to flow therein, the second transistor allows a second current to flow therein, and the first current increases with the second current. The capacitor is connected to the source terminal of the first transistor. The first resistor is connected to the source terminal of the second transistor. The second resistor allows a third current to flow therein, and the third current increases with the second current. The second resistor is related to the output voltage of the slope rate compensation circuit.
    Type: Grant
    Filed: July 24, 2008
    Date of Patent: April 27, 2010
    Assignee: Advanced Analog Technology, Inc.
    Inventor: Chih Yueh Yen
  • Publication number: 20090273874
    Abstract: A power switch circuit exhibiting over current and short circuit protections comprises a power-driving unit, a sense unit and a feedback controller circuit. The power-driving unit provides power to a load circuit from a power supply. The sense unit senses the output current of the power-driving unit. The feedback controller circuit controls the power-driving unit and the sense unit. When the output current of the power-driving unit exceeds a threshold, the output current is limited to an over current protection current level. When the resistance of the load circuit is approximately zero, the output current of the power-driving unit is limited to a short circuit protection current level.
    Type: Application
    Filed: September 2, 2008
    Publication date: November 5, 2009
    Applicant: ADVANCED ANALOG TECHNOLOGY, INC.
    Inventor: CHIH YUEH YEN
  • Publication number: 20090206815
    Abstract: A slope rate compensation circuit includes a source follower level-shift amplifier, a capacitor, a first resistor and a second resistor. The source follower level-shift amplifier includes a first transistor and a second transistor. The first transistor allows a first current to flow therein, the second transistor allows a second current to flow therein, and the first current increases with the second current. The capacitor is connected to the source terminal of the first transistor. The first resistor is connected to the source terminal of the second transistor. The second resistor allows a third current to flow therein, and the third current increases with the second current. The second resistor is related to the output voltage of the slope rate compensation circuit.
    Type: Application
    Filed: July 24, 2008
    Publication date: August 20, 2009
    Applicant: ADVANCED ANALOG TECHNOLOGY, INC.
    Inventor: CHIH YUEH YEN
  • Publication number: 20090184701
    Abstract: A control circuit comprises a PWM control circuit and a PWM skip control circuit. The PWM control circuit controls a switching circuit. The switching circuit acts as a current source for an output circuit and a load circuit. The PWM skip control circuit controls the operation of the PWM control circuit. When the output current of the switching circuit is below a predetermined threshold, the PWM skip control circuit stops the operation of the PWM control circuit. When the output voltage of the switching circuit is below a predetermined threshold, the PWM skip control circuit resumes the operation of the PWM control circuit.
    Type: Application
    Filed: August 13, 2008
    Publication date: July 23, 2009
    Applicant: ADVANCED ANALOG TECHNOLOGY, INC.
    Inventor: CHIH YUEH YEN