| 摘要 |
The invention concerns a portable device for electric power supply comprising: connection means ( 8 ) for connecting an appliance ( 1 ) to be powered; and a power supply circuit ( 6; 16 ) supplying in output a supply voltage for the appliance when the circuit is selectively connected to a mains supply or to a low-voltage electric power source. It may also comprise a battery ( 10 ). In that case, the circuit ( 6, 16 ) can charge the power storage means when the circuit is connected to an appropriate electric power source, the connection means ensuring power supply to the appliance ( 1 ) from the power storage means ( 10 ).
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