| 摘要 |
A voltage modifying device for charging rechargeable batteries, such as nicad batteries, used for powering mobile radio telephones from a DC source, such as that provided in a vehicle. The device is connectable to a DC power source, a rechargeable battery and the power input of a telephone transceiver. Power from the DC power source is directed to the transceiver and the voltage modifying circuit modifies the supply voltage so as to provide a charging current to the rechargeable battery. The modifying circuit includes a charge pump for increasing the charging voltage in addition to circuitry arranged so as to charge and discharge said charge pump at substantially constant current so as to minimize telephone transceiver interference.
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