| 摘要 |
The circuit converts the power source into the back-up battery on a power failure and protects the telephone set by cutting off the internal power of the battery if an over current occurs. The circuit comprises a rectifier (10) for rectifying the AC power of the secondary side of a transformer (T) by the full wave rectification, a current control section (20) for controlling the charging current according to the control signal from a CPU, a battery (60), a switching section (40) for switching the battery to provide the back-up power to the cordless telephone, a voltage converting section (30) for providing the predetermined voltage to the switching section and the first power supply terminal (91), and a connector (50).
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