Apparatus and method for compensating for voltage drop in portable terminal
First Claim
1. An apparatus for determining a status of a power unit in a portable terminal, the apparatus comprising:
- an internal circuit;
a power unit configured to supply power to the internal circuit;
a variable resistor having a plurality of resistance values that are selected based on an amount of current consumption due to the portable terminal, the variable resistor located between the power unit and the internal circuit;
a first voltage measurement unit configured to measure a first voltage delivered to the variable resistor from the power unit;
a second voltage measurement unit configured to measure a second voltage from the variable resistor;
a voltage compensation unit configured to measure an amount of current consumption due to the variable resistor using a difference between the first voltage and the second voltage; and
a display unit configured to display a residual amount of a battery of the power unit according to a sum of the first voltage and a product of the difference between the first voltage and the second voltage and an R,wherein the R denotes a ratio between a voltage drop according to the difference between the first voltage and the second voltage and the amount of current consumption due to the variable resistor.
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Abstract
An apparatus and method for determining a status of a power unit in a portable terminal are provided. The apparatus includes a power unit for supplying power to a internal circuit, a resistor located between the power unit and the internal circuit, and a voltage determination unit for determining an amount of a current consumption by the internal circuit by considering a difference between a first voltage between the power unit and the resistor and a second voltage between the resistor and the internal circuit, and for determining status information of the power unit by compensating for a voltage drop of the first voltage in accordance with the amount of the current consumption.
13 Citations
8 Claims
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1. An apparatus for determining a status of a power unit in a portable terminal, the apparatus comprising:
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an internal circuit; a power unit configured to supply power to the internal circuit; a variable resistor having a plurality of resistance values that are selected based on an amount of current consumption due to the portable terminal, the variable resistor located between the power unit and the internal circuit; a first voltage measurement unit configured to measure a first voltage delivered to the variable resistor from the power unit; a second voltage measurement unit configured to measure a second voltage from the variable resistor; a voltage compensation unit configured to measure an amount of current consumption due to the variable resistor using a difference between the first voltage and the second voltage; and a display unit configured to display a residual amount of a battery of the power unit according to a sum of the first voltage and a product of the difference between the first voltage and the second voltage and an R, wherein the R denotes a ratio between a voltage drop according to the difference between the first voltage and the second voltage and the amount of current consumption due to the variable resistor. - View Dependent Claims (2, 3, 4)
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5. A method for determining a status of a power unit in a portable terminal, the method comprising:
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determining a first voltage delivered to a variable resistor having a plurality of resistance values that are selected based on an amount of current consumption due to the portable terminal, and a second voltage from the variable resistor; determining an amount of a current consumption due to the variable resistor using a difference between the first voltage and the second voltage; determining a residual amount of a battery of the power unit according to a sum of the first voltage and a product of the difference between the first voltage and the second voltage and an R; and displaying the residual amount of the battery, wherein the variable resistor is located between the power unit and an internal circuit, and wherein the R denotes a ratio between a voltage drop according to the difference between the first voltage and the second voltage and the amount of current consumption due to the variable resistor. - View Dependent Claims (6, 7, 8)
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Specification