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CHARGING MODE CONTROL CIRCUIT AND METHOD

  • US 20070075683A1
  • Filed: 08/02/2006
  • Published: 04/05/2007
  • Est. Priority Date: 09/16/2005
  • Status: Abandoned Application
First Claim
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1. A charging mode control method for charging a secondary battery fixed in a portable device at the same time of data communication with an external communication device, the method comprising the steps of:

  • filtering a charging voltage and obtaining a ripple voltage from the charging voltage;

    comparing the ripple voltage with a reference voltage, thereby producing a voltage waveform signal according to a comparison result;

    integrating the voltage waveform signal and thereby producing a charging control signal; and

    selecting a charging mode for the secondary battery according to the charging control signal.

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