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Auxiliary battery voltage/temperature compensation for automotive 12 volt system for electric vehicles

  • US 5,783,872 A
  • Filed: 07/25/1996
  • Issued: 07/21/1998
  • Est. Priority Date: 07/25/1996
  • Status: Expired due to Term
First Claim
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1. A power system for an electric motor vehicle and accessories thereof, comprising:

  • a first DC power source generating a relatively high DC voltage for powering a vehicle propulsion motor;

    a second DC power source comprising a DC to DC converter powered by said first power source and generating a relatively low DC voltage for powering certain accessories of said accessories of said motor vehicle;

    an auxiliary DC power source comprising a battery having an output voltage which varies as a function of temperature for powering said accessories upon failure of said first DC power source and consequently said DC to DC converter,said battery further being coupled to said DC to DC converter and including means for being charged thereby; and

    means for regulating the output voltage of said DC to DC converter in response to a feedback signal corresponding to the output voltage of said converter and in response to a temperature reference signal corresponding to the output voltage of said battery so that the DC to DC converter will charge the battery with a voltage which matches a voltage vs. temperature profile of the battery and thus preventing the battery from being overcharged.

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