Patents Examined by K. Peckman
  • Patent number: 5289101
    Abstract: A battery charger includes a transformer having a primary coil and a secondary coil, a switch for duty control of a current flowing through the primary coil of the transformer, a detector for detecting a value of a current flowing through the secondary coil of the transformer, and a secondary controller for receiving the detected value from the detector and for outputting a charge control signal. The pulse of the charge control signal is modulated in accordance with the detected value by the detector.
    Type: Grant
    Filed: April 24, 1991
    Date of Patent: February 22, 1994
    Assignees: Fuji Electric Co., Ltd., Makita Corporation, Okada Electric Co, Ltd.
    Inventors: Masami Furuta, Takao Iwatsuki, Masatoshi Sugiura, Toshio Matsumoto, Hideki Watanabe, Hideiki Niwa
  • Patent number: 4870556
    Abstract: Control signals for operating power converter switching elements are created using one-chip microcomputers. Pulse patterns required to supply the control signals and their generating timings are previously created and scheduled in pairs. When the times when the control signals are to be supplied to the switching elements have actually come, those control signals are successively output.
    Type: Grant
    Filed: January 12, 1987
    Date of Patent: September 26, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Hiromi Inaba, Seiya Shima, Toshiaki Kurosawa, Toshimitsu Tobita, Mitsuyuki Hombu, Nobuo Mitsui