Patents by Inventor Sans Chang

Sans 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).

  • Driving circuit for switches of direct current fan motor
    Patent number: 6982531
    Abstract: A driving circuit for switches of direct current fan motor is disclosed. The driving circuit includes a plurality of switches, a first control circuit, and a second circuit. The switches are driven by a first pulse width modulation signal and a second pulse width modulation signal, and they are electrically connected with the direct current fan motor in a bridge manner. A third pulse width modulation signal is used to drive the first control circuit connected to at least one of the switches driven by the first pulse width modulation signal. A fourth pulse width modulation signal is used to drive the second control circuit connected to at least one of the switches driven by the second pulse width modulation signal. Especially, either the first pulse width modulation signal or the second pulse width modulation signal is selected as the third pulse width modulation signal or the fourth pulse width modulation signal.
    Type: Grant
    Filed: August 29, 2003
    Date of Patent: January 3, 2006
    Assignee: Delta Electronics, Inc.
    Inventors: Lain-ken Lin, Sans Chang, Magellan Chiu, Wen-shi Huang
  • Fan speed control system
    Publication number: 20050257537
    Abstract: A fan speed control system. A temperature and humidity sensing unit detects environmental temperature and humidity and outputs a corresponding electrical signal. A micro-control unit receives and processes the electrical signal to obtain a digital signal, and sends the digital signal to the fan motor circuit to control fan speed accordingly.
    Type: Application
    Filed: March 10, 2005
    Publication date: November 24, 2005
    Inventors: Sans Chang, Magellan Chiu, Chun-Lung Chiu, Ming-Shi Tsai
  • Driving circuit for switches of direct current fan motor
    Publication number: 20040264948
    Abstract: A driving circuit for switches of direct current fan motor is disclosed. The driving circuit includes a plurality of switches, a first control circuit, and a second circuit. The switches are driven by a first pulse width modulation signal and a second pulse width modulation signal, and they are electrically connected with the direct current fan motor in a bridge manner. A third pulse width modulation signal is used to drive the first control circuit connected to at least one of the switches driven by the first pulse width modulation signal. A fourth pulse width modulation signal is used to drive the second control circuit connected to at least one of the switches driven by the second pulse width modulation signal. Especially, either the first pulse width modulation signal or the second pulse width modulation signal is selected as the third pulse width modulation signal or the fourth pulse width modulation signal.
    Type: Application
    Filed: August 29, 2003
    Publication date: December 30, 2004
    Inventors: Lain-ken Lin, Sans Chang, Magellan Chiu, Wen-shi Huang