Patent ID: 8766644
Filing Date: 2014-07-01
Classification: G01R

Abstract:
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.