Electronics > Beginners

Cell phone swichmode chargers safety and isolation?

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Zero999:
There is a way to avoid the need for the Y capacitor, or at least minimise the leakage through it, without having an earth conductor. Add a screen between the primary and secondary of the flyback transformer and connect it directly or via a Y capacitor to the mains side. The coupling from the mains on the screen to the secondary, via the shield will be much less than a Y capacitor would cause and it will prevent the high switching frequency from being coupled to the secondary side.

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