| 摘要 |
An electrical appliance, utilising low voltage, is normally supplied through the mains. In the event of a break in this supply, an automatic electronic toggle system Q1, Q2, Q3 allows continuity of the electrical supply to all the members of the appliance utilising the low voltage. The back-up supply comes from a rechargeable battery VB. A system C2, C3 for delaying the disengaging of the back-up supply makes it possible to wait for the normal supply to come back up. <IMAGE>
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