Patents by Inventor Gean-Chung Hsu

Gean-Chung Hsu 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).

  • Voltage-boosting motor controller
    Patent number: 4870332
    Abstract: A boosted power-supply voltage is developed by the combination of three power drivers, a filter capacitor, and a Y-connected motor. Each of the power drivers includes a pair of transistors connected in a totem-pole configuration with a clamping (catch) diode connected between the collector and the emitter of the upper transistor. Rather than a power-supply voltage source, only the filter capacitor is connected to the collectors of the upper transistors, a reduced-voltage level DC power-supply voltage-source being connected to the motor-winding-common node.
    Type: Grant
    Filed: July 8, 1988
    Date of Patent: September 26, 1989
    Assignee: Xebec
    Inventors: David S. Coghran, Gean-Chung Hsu