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Charging device having a broad voltage changing range, automatic charging cutoff based on temperature detection, and charging status maintenance.

  • US 6,275,011 B1
  • Filed: 12/08/1999
  • Issued: 08/14/2001
  • Est. Priority Date: 12/08/1999
  • Status: Expired due to Fees
First Claim
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1. A charging circuits comprising:

  • a thyrister arranged to control a charging current supplied to a rechargeable battery;

    a negative temperature coefficient resistor element coupled to the rechargeable battery, said negative temperature coefficient resistor element having a resistance that decreases in response to a rise in temperature of the rechargeable battery to detect a charging saturation state of the battery; and

    a photo-coupler having an input side connected to a negative temperature coefficient resistor element and an output side connected in series with the gate of said thyrister, whereby the charging current is controlled by the thyrister in response to a rise in the temperature of the rechargeable battery when the rechargeable battery is fully charged.

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