Smart battery charging system, charging method therefor and power supply system for portable computer using the same
First Claim
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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Accused Products
Abstract
The present invention relates to a smart battery charging system, a charging method therefor and a power supply system for portable computer using the same that executes various charging operations securely corresponding to types of the smart batteries connected to the notebook computer. A smart battery charger 60 supplies charging voltage and charging current to the smart battery 70 selectively by controlling data input through an SM bus. The smart battery charger 60 and the smart battery 70 are connected to a keyboard controller 80 through the SM bus. The keyboard controller 80 determines the power on-off status of the notebook computer, based on second power voltage outputted from an SMPS 130, and identifies the types of the smart batteries, based on battery identifying signals outputted from the smart battery charger 60. The system controls the smart battery charger 60 appropriately based on the above detecting results and status data of the smart battery 70, thus charging the smart battery 70 stably and optimally. A constant voltage regulating circuit 150 supplies operational powers to the keyboard controller 80, regardless of the power on-off and external power source.
48 Citations
23 Claims
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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:
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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. - View Dependent Claims (2)
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3. A charge signal generator, 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, through the SM bus data port T and SM bus clock port C, various data, such as over charged alarm, charge terminated alarm, over temperature alarm, fully charged alarm and fully discharged alarm, comprising:
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a first resistor connected between the resistance sensing port and first power voltage; a first comparing means, of which a non-inverting terminal is connected to voltage level of the resistance sensing port and an inverting terminal is connected to first predetermined reference voltage; and a second comparing means, of which a non-inverting terminal is connected to voltage level of the resistance sensing port, an inverting terminal is connected to second predetermined reference voltage and an output terminal is connected to the inverting terminal of the first comparing means, the output signals of the first comparing means are outputted as charge signals.
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4. A smart battery charging system, 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:
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a battery charging means, including a charging power output port connected to the positive port of the smart battery, for varying voltage level and current level of charging power, ouputted through the charging power output port, based on data inputted through the SM bus; a charge signal generating means, connected to the resistance sensing port of the smart battery, for generating predetermined charge signals and battery identifying signals based on resistance values of the smart batteries connected to the resistance sensing port; and a keyboard controller, connected to the battery charging means and the smart battery through the SM bus, for controlling the battery charging means by identifying the types of smart batteries based on the battery identifying signals obtained from the charge signal generating means, the battery charging means executes the battery charging operations based on the charge signals obtained from the charge signal generating means. - View Dependent Claims (5)
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6. A Li-ion smart battery charging method, for charging a Li-ion 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 SM bus data port T and SM bus clock port C, comprising:
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a battery charging step of supplying the smart battery with first charging power having first voltage value and first current value; a current value reading step of reading the current value of the smart battery; and a charging voltage control step of boosting charging voltage in stages to the maximum voltage that the smart battery allows, in case that the battery current value read from the current value reading step is less than second current value, the second current value is set to be less than the first current value. - View Dependent Claims (7)
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8. A power including a smart battery that has 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 SM bus data port T and SM bus clock port C, the notebook computer charges the smart battery in case that an external power source is connected thereinto, and utilizes the charging power of the smart battery as an operational power in case that no external power source is connected thereinto, the system comprising:
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a power input means, connected to the external power source and a positive port of the smart battery, for outputting external power or smart battery power selectively based on the connection status of external power source and outputting the external power as first power voltage; a power on-off signal input means through which a user turns on and off the notebook computer; a switching mode power supply SMPS for outputting second power voltage for operating the notebook computer based on the operational power obtained from the power input means when the notebook computer is turned on, and outputting a first level of power good signal when power is on and a second level of power good signal when power is off; a constant voltage regulating means for generating third power, based on the second power voltage when the power good signal is the first level, and based on the first power voltage when the power good signal is the second level; a battery charging means, that utilizes the first power voltage as an operational power and includes a charging power output port connected to the positive port of the smart battery, for varying voltage level and current level of the charging power, ouputted through the charging power output port, according to data inputted through an SM bus; and a keyboard controller, that utilizes the third power voltage as an operational power and connects to the battery charging means and the smart battery through the SM bus, for controlling the smart battery charging means by identifying the type of smart battery based on battery identifying signals obtained from a charge signal generating means. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification