Patents by Inventor Hsuan-Hao CHIEN

Hsuan-Hao CHIEN 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: 10257898
    Abstract: A LED driving apparatus including a power converter, a judging module and a control module is disclosed. The power converter and the judging module are coupled to at least one LED respectively. The control module is coupled to the judging module. The control module includes a current source and a transconductance amplifier. The current source is coupled to an output terminal of the transconductance amplifier. The power converter converts an input voltage into an output voltage and transmits the output voltage to the at least one LED. The judging module judges whether a LED current is changed from a first LED current value to a second LED current value. If yes, the judging module generates a judging signal to the control module. The control module changes a current value of the current source and a transconductance of the transconductance amplifier.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: April 9, 2019
    Assignee: Raydium Semiconductor Corporation
    Inventors: Hsuan-Hao Chien, Shen-Xiang Lin, Chih-Jen Hung
  • Patent number: 10143054
    Abstract: In a LED driver, a dimming control circuit receives a PWM signal and a clock signal and outputs a dimming signal and a sampling signal. A turn-on time of sampling signal is shorter than a cycle of clock signal. A first error amplifier receives a feedback voltage, a reference voltage and a dimming signal and outputs a compensating voltage. A second error amplifier receives the compensating voltage and a ramp signal and outputs a pulse voltage. A driving controller receives the dimming signal and pulse voltage and outputs a control signal. An output stage receives the control signal and an input voltage and generates an output voltage to LED strings. A minimum voltage selecting unit selects a minimum LED voltage. The first error amplifier receives the minimum LED voltage through the selectively conducted switch unit controlled by the sampling signal.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: November 27, 2018
    Assignee: DAZZO TECHONOLOGY CORPORATION
    Inventors: Shen-Xiang Lin, Hsuan-Hao Chien, Chih-Jen Hung
  • Patent number: 10140916
    Abstract: A charge pump and operating method thereof are disclosed. The charge pump includes a first capacitor to a third capacitor and a first switch to a tenth switch. The charge pump is used to receive an input voltage and provide an output voltage to a load capacitor. When the charge pump is operated in a first mode, the charge pump controls the second capacitor failure, the output voltage and the input voltage have opposite electricity and the output voltage is (?½) times the input voltage. When the charge pump is operated in a second mode, the charge pump controls the second capacitor failure, the output voltage and the input voltage have opposite electricity and the output voltage is (??) times the input voltage.
    Type: Grant
    Filed: February 1, 2018
    Date of Patent: November 27, 2018
    Assignee: DAZZO TECHNOLOGY CORPORATION
    Inventors: Li-Chieh Chen, Hsuan-Hao Chien, Chih-Jen Hung
  • Publication number: 20180226017
    Abstract: A charge pump and operating method thereof are disclosed. The charge pump includes a first capacitor to a third capacitor and a first switch to a tenth switch. The charge pump is used to receive an input voltage and provide an output voltage to a load capacitor. When the charge pump is operated in a first mode, the charge pump controls the second capacitor failure, the output voltage and the input voltage have opposite electricity and the output voltage is (?½) times the input voltage. When the charge pump is operated in a second mode, the charge pump controls the second capacitor failure, the output voltage and the input voltage have opposite electricity and the output voltage is (??) times the input voltage.
    Type: Application
    Filed: February 1, 2018
    Publication date: August 9, 2018
    Inventors: Li-Chieh Chen, Hsuan-Hao Chien, Chih-Jen Hung
  • Publication number: 20180211588
    Abstract: A bias generation circuit coupled to a display panel is disclosed. The bias generation circuit includes a linear regulator, a charge pump and a synchronous dual mode boost DC-DC converter. The linear regulator and the charge pump are coupled to the display panel respectively. The synchronous dual mode boost DC-DC converter is selectively operated in a pulse width modulation mode or a pulse frequency modulation mode according to a control signal. In the pulse width modulation mode, the synchronous dual mode boost DC-DC converter controls the linear regulator to generate a first voltage signal to the display panel. In the pulse frequency modulation mode, the synchronous dual mode boost DC-DC converter controls the charge pump to generate a second voltage signal to the display panel.
    Type: Application
    Filed: January 25, 2018
    Publication date: July 26, 2018
    Inventors: Shen-Xiang LIN, Hsuan-Hao CHIEN, Chih-Jen HUNG
  • Publication number: 20180132323
    Abstract: A LED driving apparatus including a power converter, a judging module and a control module is disclosed. The power converter and the judging module are coupled to at least one LED respectively. The control module is coupled to the judging module. The control module includes a current source and a transconductance amplifier. The current source is coupled to an output terminal of the transconductance amplifier. The power converter converts an input voltage into an output voltage and transmits the output voltage to the at least one LED. The judging module judges whether a LED current is changed from a first LED current value to a second LED current value. If yes, the judging module generates a judging signal to the control module.
    Type: Application
    Filed: November 9, 2017
    Publication date: May 10, 2018
    Inventors: Hsuan-Hao CHIEN, Shen-Xiang LIN, Chih-Jen HUNG
  • Publication number: 20180132321
    Abstract: In a LED driver, a diming control circuit receives a PWM signal and a clock signal and outputs a dimming signal and a sampling signal. A turn-on time of sampling signal is shorter than a cycle of clock signal. A first error amplifier receives a feedback voltage, a reference voltage and a dimming signal and outputs a compensating voltage. A second error amplifier receives the compensating voltage and a ramp signal and outputs a pulse voltage. A driving controller receives the dimming signal and pulse voltage and outputs a control signal. An output stage receives the control signal and an input voltage and generates an output voltage to LED strings. A minimum voltage selecting unit selects a minimum LED voltage. The first error amplifier receives the minimum LED voltage through the selectively conducted switch unit controlled by the sampling signal.
    Type: Application
    Filed: November 9, 2017
    Publication date: May 10, 2018
    Inventors: Shen-Xiang LIN, Hsuan-Hao CHIEN, Chih-Jen HUNG