초록 ▼

The invention relates to an electronic apparatus whose power is supplied by a battery (11) having a memory (32) which contains electrically erasable data (32a) and a supply voltage detection device (37) for detecting a variation of the supply voltage (Vbat). The invention notably has for its object

The invention relates to an electronic apparatus whose power is supplied by a battery (11) having a memory (32) which contains electrically erasable data (32a) and a supply voltage detection device (37) for detecting a variation of the supply voltage (Vbat). The invention notably has for its object to provide a detection device (37) which is capable of instantaneously detecting various voltage levels to cut off the power supply (Vbat) without the contents of the memory (32) being changed and capable of indicating the charging level of a battery (11) or an overload. The invention may be used in portable telephones and other electronic equipment whose power is supplied by a power supply battery.

대표청구항 ▼

[ What is claimed is:] [1.]1. An electronic device a comprising:a power source which supplies a supply voltage to said electronic device;a memory which stores data corresponding to threshold values;a controller which is connected to a collector of a transistor to monitor said supply voltage, said co

[ What is claimed is:] [1.]1. An electronic device a comprising:a power source which supplies a supply voltage to said electronic device;a memory which stores data corresponding to threshold values;a controller which is connected to a collector of a transistor to monitor said supply voltage, said controller controlling a variable resistor connected to base of said transistor to switch said transistor when said supply voltage reaches said threshold values;said controller changing said variable resistor to increase said threshold values when said power source is being charged, and to decrease said threshold values when said power source is being discharged.