| 摘要 |
A portable power supply 10 has an electrical generator 30, a charge store 40, and a rapid charging circuit 50 for charging a secondary cell 80 in a portable electronic device 20. The supply 10 thus allows the device 20 to be rapidly recharged and then disconnected from the supply 10, whereby portability of the device 20 is not sacrificed. The generator 30 may be a manually operated generator, a fuel cell, or particularly a solar cell. The charge store 40 may be a capacitor, or particularly a secondary cell. The circuit 50 may provide constant current and/or constant voltage charging. The charge state of the cell 40 may be indicated by a display (41c, or 42c, Figs.8,9) controlled by a circuit responsive to cell current and/or voltage. An LED (45, Fig.13) may be provided to indicate that the solar cell 30 is generating. A discharger (43 or 44, Figs.10-12) may be provided for discharging cell 40 to prevent memory effect. The discharger may be controlled manually, or by means of a circuit responsive to the number of times the cell 40 has discharged to the device 20, or responsive to integration of the charge and/or discharge time periods of the cell 40. The cell 40 may be charged from the solar cell 30 via a constant current or constant voltage charger circuit (46, Fig.14). The cell 40 may be housed in a case (11, Figs.5,6) having a fold-up solar cell array (12). The supply 10 may have a spring-loaded reel (17, Fig.7) for winding up a power cord (15) by means of which the supply 10 can be releasably connected to the device 20. The portable device 20 may be a communication device, such as a telephone, or a personal computer. |
