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Monitoring circuit for a system for recharging a motor vehicle battery

  • US 5,254,935 A
  • Filed: 04/13/1992
  • Issued: 10/19/1993
  • Est. Priority Date: 04/22/1991
  • Status: Expired due to Fees
First Claim
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1. A monitoring circuit for a motor vehicle battery recharging system which comprises an electrical generator with an induction coil and a field coil, output of the generator being connected to terminals of a battery;

  • the monitoring circuit comprisinga driver transistor having a collector-emitter path connected in series to the field coil of the generator and a direct current voltage source,field coil current sensor means for providing a signal indicative of current flowing during operation in the field coil, anddriver circuit means for driving said transistor as a function of voltage produced by the generator and the signal provided by said field coil current sensor means, said driver circuit means comprisinga detector circuit connected to a phase of the generator for providing a signal indicative of rotary speed of the generator, anda processing and comparison circuit coupled to said detector circuit for generating a signal for controlling conduction of current through said transistor so that current intensity flowing through the collector-emitter path of said transistor varies as a function of the rotary speed of the generator.

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