Battery charger with Vbe temperature compensation circuit

  • US 4,847,547 A
  • Filed: 07/21/1988
  • Issued: 07/11/1989
  • Est. Priority Date: 07/21/1988
  • Status: Expired due to Fees
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First Claim
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1. A battery charger for supplying to a battery an output voltage having a desired temperature coefficient of voltage, comprising:

  • an operational amplifier having a summing junction and an output connected to supply a charging potential therefrom to the battery;

    means for supplying a reference current to said summing junction; and

    Vbe multiplier means connected between the output and the summing junction of said operational amplifier, said Vbe multiplier means including a bipolar transistor and means for biasing said bipolar transistor into an active region thereof whereby the charging voltage supplied by said amplifier is temperature compensated in accordance with a negative temperature coefficient of voltage operating characteristic of said bipolar transistor.

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