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Method and circuit for emulating a trumpet contact breaker

  • US 6,175,297 B1
  • Filed: 06/08/1998
  • Issued: 01/16/2001
  • Est. Priority Date: 06/09/1997
  • Status: Expired due to Term
First Claim
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1. A method for emulating a contact breaker in a trumpet comprising an inductor coil powered from a battery through a power driver device, the method comprising the steps of:

  • obtaining a derivative of a current value flowing through the inductor coil of a trumpet;

    sensing a change in a slope of said derivative, and turning off a circuit portion of the driver device upon a negative slope being sensed; and

    turning said circuit portion back on after a transient period of a predetermined duration.

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