Ripple detector for automotive alternator battery charging systems

  • US 4,315,204 A
  • Filed: 05/22/1980
  • Issued: 02/09/1982
  • Est. Priority Date: 05/22/1980
  • Status: Expired due to Term
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First Claim
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1. In a multiphase alternator battery charging system, a detector monitoring the voltage ripple in the rectified electrical output signal of said alternator comprising:

  • means for monitoring the undulating rectified electrical signal supplied to the battery by said alternator and producing a signal level in response thereto,means coupled to said alternator for measuring the rotational speed in said alternator and producing a signal level in response thereto;

    means coupled to the field coil of said alternator determining the excitation current supplied thereto;

    variable threshold means, combining the output signal from said rotational speed means and said determined field coil excitation current, producing a combined signal level; and

    comparison means, responsive to the signal level from said monitoring means and said combined signal level, producing an output signal level indicative of the detection of a voltage ripple in excess of said combined signal level.

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