Patents by Inventor Ling-Hwei Chang

Ling-Hwei 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: 5164651
    Abstract: Disclosed is a starting current limiting device for single-phase induction motors, driven by an AC power supply, used in household electrical equipment. The device is adapted to provide, as the power switch of the induction motor is just turned on, a low and gradually increasing starting current flowing into the induction motor. The device is capable of cutting some portions of each cycle in the waveform of the AC power off such that the average voltage input to the single-phase induction motor is reduced, and/or converting some portions of each cycle to oscillate in the reverse directions such that the waveform of the AC power input to the single-phase induction motor appears to have a lower frequency. The device is provided with a switching circuit including a plurality of thyristors, which can be silicon controlled rectifiers or triacs.
    Type: Grant
    Filed: July 3, 1991
    Date of Patent: November 17, 1992
    Assignee: Industrial Technology Research Institute
    Inventors: Tien-Cheng Hu, Wen-Hui Cheng, Ling-Hwei Chang, Eric Han