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Monitoring the characteristics of a load driver controlled by a microcontroller

  • US 5,448,492 A
  • Filed: 06/03/1994
  • Issued: 09/05/1995
  • Est. Priority Date: 10/26/1992
  • Status: Expired due to Term
First Claim
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1. A control system comprising a DC power source, a load, a drive, and a control for activating the drive to provide power to operate the load, characterized in that:

  • the drive comprises means in connection with said load and the power source for producing a load test signal, with a magnitude that is a function of load resistance in response to a test select signal supplied from said control prior to providing the drive signal, the test select signal having a magnitude that is insufficient to operate the load;

    means for convening said load test signal into a digital signal equivalent that is supplied to the control; and

    said control comprises signal processing means for providing said test select signal, for receiving said digital signal before said drive is activated, for comparing said digital signal to a stored signal for said load and for preventing activation of said drive if the difference between said digital signal and said stored signal exceeds a stored magnitude.

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