Patents Assigned to 501 Nec Home Electronics
  • Fail-safe control circuit
    Patent number: 4745542
    Abstract: A fail-safe control circuit which requires that all control units produce control signals to operate a controlled device. The control units receive a feedback signal used for comparing with the control signal. When the control signal and the feedback signal do not match, a power supply interruption or disagreement signal causes a relay to disconnect power to the controlled device placing the controlled device in a fail-safe state.
    Type: Grant
    Filed: November 12, 1985
    Date of Patent: May 17, 1988
    Assignee: 501 Nec Home Electronics
    Inventors: Satoshi Baba, Tadashi Nose, Tetsuji Muto, Yuji Fujimura