To solve the problem, wherein when the output voltage of a direct-current power source, such as an AC adaptor or a car battery, connected to a charger body gets out of an allowable voltage range within which the charger body can operate normally, a fault or abnormal charging operation is caused in the charger and this can lead to damages to the direct-current power source itself due to abnormal charging.
The charger includes: supply voltage detecting means 142 and 143, that detect that the input voltage Vin of a direct-current power source 200 supplied to an input terminal 131 is equal to or lower than the lower limit value of or equal to or higher than the upper limit value of an allowable voltage range, within which a charging power supply circuit portion 146 can normally operate; and a power supply interrupting means 141 that stops the charging operation of the charging power supply circuit portion 146, based on the detection signal from the supply voltage detecting means 142 and 143. When the supply voltage detecting means 142 and 143 detect a voltage equal to or lower than the lower limit value of or equal to or higher than the upper limit value of the input voltage Vin of the direct-current power source 200, the power supply interrupting means 141 makes the charging operation of the charging power supply circuit portion 146 stop.
TAKANO NOBUHIRO
NAKAYAMA EIJI
FUJISAWA HARUHISA
SAITO KEITA
| JPH1014120A | 1998-01-16 | |||
| JPH0956056A | 1997-02-25 | |||
| JPH02299431A | 1990-12-11 |
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