Patent ID: 6909288
Filing Date: 2005-06-21
Classification: G01R

Abstract:
1. A battery remaining amount warning circuit that detects a voltage drop of a battery of an electronic device, comprising: a dummy-load circuit connected to the battery; a storage device which stores a current value in each of various operating modes of the electronic device; a current addition device which intermittently feeds the dummy-load circuit with a difference current representing a difference between a current value in a specific operating mode out of the various operating modes and a current value of another operating mode out of the various operating modes stored in the storage device; a measuring device which measures a voltage of the battery, causes, when the voltage value of the battery falls to a specified level, the current addition device to intermittently feed the dummy-load circuit with the difference current and measures DC resistance or voltage of the battery when the current flows; and a warning device which gives a warning when a voltage drop of the battery is detected from the DC resistance value or voltage value measured by the measuring device.