| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery type portable charger for portable telephone set that can immediately assure the back-up operation if a battery of a dry- battery type portable telephone set which can be obtained anywhere and can be used safely for any type of portable telephone set. SOLUTION: This charger is composed of two dry-batteries 2, 3 that can be provided replaceable, a control circuit 9 consisting of a low-voltage operation type switching regulator circuit 8 and a voltage monitoring circuit 11 connected to such dry-batteries and a connector 7 that can be connected or disconnected to or from a built-in battery of the portable telephone set. The dry-batteries 2, 3, control circuit 9 and connector 7 are integrated within the same housing for the convenience of portable design. |
