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CHARGING DEVICE, ELECTRONIC EQUIPMENT INCLUDING SAME, AND CONTROL METHOD OF CHARGING DEVICE

  • US 20110018500A1
  • Filed: 07/20/2010
  • Published: 01/27/2011
  • Est. Priority Date: 07/21/2009
  • Status: Active Grant
First Claim
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1. A charging device to charge a secondary battery, the charging device comprising:

  • a DC/DC circuit to generate a charging current supplied to the secondary battery;

    an impedance measurement circuit to measure an impedance of the secondary battery;

    a first control circuit to output a duty-cycle decrease signal in accordance with the measured impedance;

    a charging-current monitor circuit to detect the charging current outputted from the DC/DC circuit when the duty cycle of the pulses generated by the DC/DC circuit is decreased by the duty-cycle decrease signal; and

    a second control circuit to compare the charging current detected by the charging-current monitor circuit and a charging-current threshold and to output to the DC/DC circuit a frequency change signal that increases a switching operation frequency in the DC/DC circuit.

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