Patents by Inventor Wen-Jen Yeh

Wen-Jen Yeh 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: 6128368
    Abstract: An apparatus for monitoring telecommunication transmission is disclosed that a resistance detection unit having a plurality of resistors connected in series is connected between an input terminal of a transformer in a power supply at an absolute ground potential and a high voltage output terminal of the transformer at a relative ground potential. A photo-coupler transistor is connected in parallel with one of the resistors such that the photo-coupler transistor is conductive when a leakage current flows through the resistor, thereby generating a low potential signal. The low potential signal is transmitted to a central processing unit through a logic gate. Upon reception of the signal, the central processing unit will shut down the power supply for security.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: October 3, 2000
    Assignee: Teamgreat Corporation
    Inventor: Wen-Jen Yeh
  • Patent number: 5347164
    Abstract: A method and apparatus is described for providing uninterrupted DC and selectable AC power depending on the value of utility-supplied AC voltage range. In the AC 115 V output case, by means of setting a selecting switch and switching a relay port, the DC/AC inverter will function as a half bridge switching circuit upon power failure and use the mid-point of series connected filtering capacitors as a relative ground reference point, to provide an AC 115 V output; in the AC 230 V output case, by means of different setting of the selecting switch and switching a relay port, a DC/AC inverter will function in a full bridge circuit upon power failure and use the full voltage of the series connected filtering capacitors, to provide an AC 230 V output. The power source of the control circuit in the backup portion is interlocked and sequentially controlled for the purpose of power saving.
    Type: Grant
    Filed: October 8, 1992
    Date of Patent: September 13, 1994
    Assignee: Accton Technology Corporation
    Inventor: Wen-Jen Yeh