Patents Examined by B. B. Dobeck
  • Patent number: 4544869
    Abstract: The disclosure provides an electronic motor control circuit which switches and amplifies to control a bi-directional electric motor, using a symmetrical circuit, each half of which consists of five transistors. The circuit has a logic level input and motor driving power output using, for control in each direction: an input transistor; a control transistor turned on and off by the input transistor; two matched, complementary motor drive transistors (at opposite terminals of the motor) turned on and off simultaneously by the control transistor; and a lockout transistor, also actuated by the control transistor, which is operatively connected to one of the motor drive transistors in the other half of the system to prevent short circuiting.
    Type: Grant
    Filed: October 5, 1983
    Date of Patent: October 1, 1985
    Assignee: Unisen, Inc.
    Inventor: James W. Pittaway