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Digitally controlled switch mode power supply for charging rechargeable batteries

  • US 6,031,359 A
  • Filed: 10/28/1997
  • Issued: 02/29/2000
  • Est. Priority Date: 10/10/1996
  • Status: Expired due to Fees
First Claim
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1. A charging circuit for charging a battery, the circuit comprising:

  • a. a measurement circuit that determines a parametric battery value while the battery is coupled to the charging circuit; and

    b. a control circuit that provides a control signal, the control signal comprising a sequence of consecutive pulses, each pulse comprising a respective duty cycle selected from a set of predetermined duty cycles, the set having a duty cycle resolution, wherein the control circuit selects a plurality of duty cycles for the sequence from the set in response to the battery value; and

    c. a supply circuit that receives the control signal and provides a power signal for charging the battery, the power signal having a magnitude and a resolution, the magnitude being responsive to an average of the respective duty cycles, thereby power provided for battery charging is controlled with a power signal resolution of greater precision than the duty cycle resolution.

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