Patent ID: 9651594
Date: 2017-05-16
CPC Classifications: G01R

Claim:
1. A battery remaining power predicting device which measures a voltage of a battery and a load current to predict remaining power of the battery, said battery remaining power predicting device comprising: a first voltage detection portion which detects the voltage of the battery; a second voltage detection portion which detects a voltage across a current sense resistor for detecting the load current; a controller which predicts the remaining power of the battery, based on the values of the voltages detected by the first and second voltage detection portions; and a constant current source which allows a constant current to flow through the current sense resistor, said controller calculating a resistance value of the current sense resistor, based on the detected voltage of the second voltage detection portion when the load current flows, and the detected voltage of the second voltage detection portion when the load current and the constant current flow.