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Smart battery charging system, charging method therefor and power supply system for portable computer using the same

  • US 6,025,698 A
  • Filed: 08/24/1998
  • Issued: 02/15/2000
  • Est. Priority Date: 08/25/1997
  • Status: Expired due to Fees
First Claim
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1. A smart battery charger, for supplying predetermined charging power to a smart battery that includes a positive port (+), a resistance sensing port T, a System Management SM bus data port D, a System Management SM bus clock port C and a negative port (-), and outputs various data, such as over charged alarm, charge terminated alarm, over temperature alarm, fully charged alarm and fully discharged alarm through the SM bus data port T and SM bus clock port C, comprising:

  • a switching mode power supply SMPS for generating predetermined operational power based on first predetermined power voltage and keeping power voltage, inputted from a feedback port provided therein, constant;

    a current detecting means for receiving the operational is power outputted from the SMPS and outputting current corresponding to current amount outputted through a predetermined detected current output port provided therein; and

    a digital-to-analog converting means, connected to the SM bus, including first and second voltage output ports for outputting first and second power signals corresponding to data inputted through the SM bus,the output current of the current detecting means is coupled to a charging power output port,first and second resistors are serially connected between the charging power output port and a ground, and nodes, formed therebetween, are linked to the feedback port of the SMPS through a line,the first voltage output port of the digital-to-analog converting means is connected to the line through a third resistor,the detected current output port of the current detecting means is coupled to the line through a first diode and to the second voltage output port of the digital-to-analog converting means through a second diode and a fourth resistor.

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