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The only one I can think of is known as an "Uninterruptable Power Supply" or U.P.S. for short.

Usually connected to computers or to other equipment where they provide D.C. or direct current output from A.C. ( alternating current ) mains.

Inside there are one or more batteries that are charged when the mains are on.

The rectifier side creates the direct current.

When the mains fails the inverter side of things may take the power from the battery, creating an a.c. supply which could be used by the rectifier side for the output.

Although I'm an electrician, I've never taken one apart to have a look or even seen the circuit diagram for one so I would not take this as a 100% accurate answer.

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14y ago

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