POWER SUPPLY SYSTEM AND PORTABLE APPARATUS EMPLOYING IT

摘要

A power supply system for portable apparatus comprising a power supply, i.e. a lithium ion secondary battery, a section for detecting the temperature of the power supply, a section for detecting the voltage of the power supply, a storage section, and a forced discharge section. The storage section stores the control operating temperature, the control operating voltage, and the control termination voltage. The forced discharge section recognizes a state that the temperature of the power supply is not lower than the control operation temperature and the voltage of the power supply is not lower than the control operation voltage as a fault of the power supply. An indicating section is electrified from the power supply and a message to the effect that the system is avoiding abnormality is indicated by the indicating section. Furthermore, the power supply is discharged forcedly until the voltage of the power supply reaches the control termination voltage.