CIRCUIT FOR MEASURING REMAINING BATTERY CAPACITY OF MOBILE TERMINAL - THE CIRCUIT IS COMPRISED OF A STRAIN GAUGE FOR DETECTING A CHANGE IN A VOLUME, AN AMPLIFIER FOR AMPLIFYING THE OUTPUT VOLTAGE OF THE GAUGE, AND AN MSM FOR CALCULATING THE REMAINING BATTERY CAPACITY

摘要

PURPOSE: A circuit for measuring remaining battery capacity of a mobile terminal is provided to accurately measure a remaining battery capacity on the basis of a change in the volume of a battery cell case. CONSTITUTION: A battery cell(41) is a target to measure a remaining battery capacity. A strain gauge(42) attached on a surface of the battery cell(41) detects a change in a volume by charging or discharging of the battery cell(41). An amplifier(43) amplifies an output voltage of the strain gauge(42) changing according to charging or discharging of the battery cell(41) to a certain level. An MSM(Mobile Station Modem)(44) calculates the remaining capacity of the battery cell(41) based on the output voltage of the amplifier(43).