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Solid-state relay

  • US 4,745,311 A
  • Filed: 05/01/1987
  • Issued: 05/17/1988
  • Est. Priority Date: 05/07/1986
  • Status: Expired due to Fees
First Claim
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1. A solid-state relay, comprising:

  • a first and a second light emitting element which are adapted to be lighted up by an input signal;

    a first light receiving element which is optically coupled to the first light emitting element and is adapted to selectively supply AC electric power from a power source to a load depending on whether the light from the first light emitting element is being received or not;

    a second light receiving element which is optically coupled to the second light emitting element and is adapted to supply the AC electric power from the power source to the load depending on whether the light from the second light emitting element is being received or not; and

    a time delay means which maintains the second light emitting element lighted up for a certain time interval after the input signal is terminated;

    the second light receiving element comprises a means for terminating the supply of the AC electric power to the load when the voltage of the power source is below a certain level.

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