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The feedback circuit needs power to run before it can generate power, so an additional non-switching power-supply for stand-by is added. Transformer design [ edit ] Any switched-mode power supply that gets its power from an AC power line (called an “off-line” converter [33] ) requires a transformer for galvanic isolation .
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A railway electrification system supplies electric power to railway trains and trams without an on-board prime mover or local fuel supply. Electric railways use either electric locomotives (hauling passengers or freight in separate cars), electric multiple units (passenger cars with their own motors) or both.
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