LOW VOLTAGE ALARM RELEASING SYSTEM

摘要

PURPOSE:To realize a releasing system for a low voltage alarm for a portable telephone set without the fluctuation of a battery voltage due to the load and the effect due to a change in a battery characteristic. CONSTITUTION:A battery state detector 14 backed up by a backup battery 15 detects a removed battery 11 and releases a low voltage alarming signal 16 generated in advance by a control circuit 12 only when the battery 11 is removed to release the low voltage alarm independently of the fluctuation in the battery voltage and the change in the battery characteristic.