AC/DC LOW VOLTAGE POWER SUPPLY DEVICE AND METHOD OF STEPPING DOWN AC/DC VOLTAGE

摘要

An alternating current/direct current (AC/DC) low voltage power supply device includes a stepping down unit for stepping down voltage provided by an electric power source, wherein the power source provides a voltage up to but not exceeding a predetermined value. The stepping down unit includes a switch for connecting or disconnecting an energy storage device or a load device to an AC electrical source.