×

Switching circuit

  • US 4,441,136 A
  • Filed: 06/04/1982
  • Issued: 04/03/1984
  • Est. Priority Date: 10/21/1978
  • Status: Expired due to Fees
First Claim
Patent Images

1. A switching circuit comprising a solid state switch having an input and output, a load connected to the output of the solid state switch, switch sensing circuitry means connected to the load for indicating current therein, drive circuitry means for driving the solid state switch which, in turn activates, the switch sensing circuitry means so that the switch sensing circuitry means senses an operating characteristic of the solid state switch, said switch sensing circuitry means comprising at least three individual circuits, said at least three individual circuits being connected to the load for measuring the the voltage across the solid state switch and issuing signals indicating whether operating values of said at least three individual circuits are greater or less than given threshold values for said at least three individual circuits, and digital logic circuit means connected to said at least three individual circuits for receiving said signals issued by said at least three individual circuits and for producing two digital output signals from the signals received from said at least three individual circuits, one of said two signals indicating whether or not a fault in the solid state switch or in the load is present, and another of said two signals indicating the seriousness of said fault.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×