Isolated DC/DC Converters

What are isolated DC/DC converters? What kinds of isolated DC/DC converters are applicable? Which applications require high isolated converters? DC/DC converters are power supplies that can change one DC supply voltage into another DC voltage. In other words they act like a transformer but with constant voltage supplies instead of AC supplies.

Although DC/DC-converters exist without input-output isolation, most DC/DC converters use an internal transformer and the output is electrically (galvanically) isolated from the input.

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