Patents by Inventor Hai-Wen CHANG

Hai-Wen CHANG 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: 9866061
    Abstract: A power supply apparatus with a protection function includes a pulse width modulation control unit, a pulse width modulation detecting unit, a switch unit and a feedback circuit. The feedback circuit detects a bus voltage. When the feedback circuit detects that the bus voltage is greater than a predetermined voltage, the feedback circuit sends an informing signal to the pulse width modulation control unit. The pulse width modulation control unit adjusts a duty cycle of a pulse width modulation signal and sends the pulse width modulation signal to the pulse width modulation detecting unit. When the pulse width modulation detecting unit detects that the duty cycle of the pulse width modulation signal is less than a predetermined cycle, the pulse width modulation detecting unit turns off the switch unit to stop outputting power to avoid a reverse current phenomenon.
    Type: Grant
    Filed: November 20, 2015
    Date of Patent: January 9, 2018
    Assignee: Chicony Power Technology Co., Ltd.
    Inventors: Tzu-Hung Wang, Wei-Yuan Chen, Che-Hao Chang, Zhi-Hong Lu, Hai-Wen Chang
  • Publication number: 20170149271
    Abstract: A power supply apparatus with a protection function includes a pulse width modulation control unit, a pulse width modulation detecting unit, a switch unit and a feedback circuit. The feedback circuit detects a bus voltage. When the feedback circuit detects that the bus voltage is greater than a predetermined voltage, the feedback circuit sends an informing signal to the pulse width modulation control unit. The pulse width modulation control unit adjusts a duty cycle of a pulse width modulation signal and sends the pulse width modulation signal to the pulse width modulation detecting unit. When the pulse width modulation detecting unit detects that the duty cycle of the pulse width modulation signal is less than a predetermined cycle, the pulse width modulation detecting unit turns off the switch unit to stop outputting power to avoid a reverse current phenomenon.
    Type: Application
    Filed: November 20, 2015
    Publication date: May 25, 2017
    Inventors: Tzu-Hung WANG, Wei-Yuan CHEN, Che-Hao CHANG, Zhi-Hong LU, Hai-Wen CHANG