Rechargeable power supply with rechargeable battery device and charging device and method for charging a rechargeable battery device

摘要

A battery (24, Figs. 1,2) of a rechargeable battery device 20 is connected to a secondary induction coil 21 which is displaceable relative to a primary induction coil 14 of a charging device 10, so that the battery (24) is charged when the coils 14 and 21 are located adjacent one another such that a current in the coil 14 can induce a current in coil 21. The battery (24) and coil 21 may be incorporated in an electrical product, particularly a wireless electrical product such as a remote control unit, eg. a wireless computer mouse 30. The primary coil 14 is has a transistor driver (13, Figs. 1,2) receiving a pulse train from an oscillator (12), the oscillator (12) and driver (13) being powered by a DC power source (11) which incorporates a voltage regulator (113) for deriving a desired DC voltage from an AC or DC supply. The secondary coil 21 is connected to the battery (24) via rectifier and filter circuits (22, 23). The coils 14 and 21 are preferably planar spiral coils.