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Method of and circuit for testing an electrical actuator drive stage

  • US 6,330,140 B1
  • Filed: 05/11/1999
  • Issued: 12/11/2001
  • Est. Priority Date: 03/01/1996
  • Status: Expired due to Term
First Claim
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1. A circuit for testing an actuator and drive stage thereof comprising a controller for selectively coupling a drive current to energize the actuator in drive state and a reduced current to per form diagnostic test on the actuator and the drive stage to an input to the actuator and drive stage through which current is supplied to the actuator, and for switching on at least part of the actuator and drive stage during supply of the reduced current, and a measuring circuit for measuring an electrical parameter within the actuator and drive stage, wherein the controller includes a comparator for comparing the measured electrical parameter with a predetermined value which corresponds to a current characteristic of the actuator and drive stage to signal a fault condition when the electrical parameter is different from the predetermined value.

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