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Ripple detecting polarity indicator for battery charger

  • US 4,654,575 A
  • Filed: 02/18/1986
  • Issued: 03/31/1987
  • Est. Priority Date: 02/18/1986
  • Status: Expired due to Term
First Claim
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1. In connection with a battery charger output cable connected with an energized charger,the terminal of said cable embodying circuitry responsive to an AC ripple component in the battery charger output, said circuitry comprisingduring an interval of increasing voltage of the ripple component in a battery charger output,a first capacitor responsive to an AC ripple component passing current to the base-emitter junction of a transmitter,a second capacitor discharging current from said base-emitter junction,a correct polarity indicator,said second capacitor diverting current which would otherwise pass through and energize said correct polarity indicator,an incorrect polarity indicator in circuit with said second capacitor being reversely biased relative to said current passing from said second capacitor,during an interval of decreasing voltage of said ripple component in said battery charger output,said first capacitor reversing the direction of said current discharging the same through a second circuit including said second capacitor, said second capacitor having such a greater magnitude of capacitance value than said first capacitor as to pass insufficient voltage to energize said correct polarity indicator and said incorrect polarity indicator being biased relative to said reverse direction of current is energized thereby.

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