Patents by Inventor Cheng Chung Yan

Cheng Chung Yan 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).

  • Two stage boost converter topology
    Patent number: 7023186
    Abstract: A power converter having a two stage boost circuit and a small boost converter. The main power flow for the power converter is via the two stage booster circuit having a single switch. The voltage spike of the switch is clamped by a diode and a capacitor. The energy at the capacitor is transferred to the power converter's output terminals by the small boost converter. The two stage boost converter topology enables the use of much lower voltage and Rdson MOSFET switches so as to reduce cost, switch conduction loss and turn on loss.
    Type: Grant
    Filed: August 5, 2004
    Date of Patent: April 4, 2006
    Assignee: Astec International Limited
    Inventor: Cheng Chung Yan
  • Electrical power inverter
    Patent number: 5657220
    Abstract: An electrical power inverter with a controllable output voltage waveform is disclosed. In a preferred embodiment, the electrical power inverter has a trapezoidal output voltage waveform with rising and falling edges that are controlled such that their slopes are kept below a selected value.
    Type: Grant
    Filed: December 4, 1995
    Date of Patent: August 12, 1997
    Assignee: Astec International, Ltd.
    Inventor: Cheng Chung Yan