Patents Represented by Attorney, Agent or Law Firm Arent Fox Kinter Plotkin and Kahn
  • Patent number: 6515462
    Abstract: A power supply device produces a predetermined voltage from a supply voltage through a voltage follower composed of a plurality of transistors. The voltage follower has a function of preventing backflow current. The voltage follower has one end connected to the supply voltage and another end connected to a capacitor. A constant voltage generating circuit produces a constant voltage from the voltage across the capacitor. A switch circuit is connected between the supply voltage and the control electrode of one of the transistors constituting the voltage follower other than the first-stage transistor thereof. A voltage drop detecting circuit detects a drop below a predetermined level in the voltage across the capacitor, and turns on the switch circuit on detecting such a drop.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: February 4, 2003
    Assignee: Rohm Co., Ltd.
    Inventors: Koichi Inoue, Hirokazu Oki
  • Patent number: D466907
    Type: Grant
    Filed: June 24, 1999
    Date of Patent: December 10, 2002
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventor: Masayuki Ohsumi