All power supplies support Zero Voltage Switching and Zero Current Switching when they're powered off.

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@niconiconi When switching mains AC power, with precise timing, a simple toggle switch can also be both Zero Voltage Switching and Zero Current Switching.

@Neo_Chen Sometimes I switch my AC transformer on, there's a loud "bang" other times it makes no noise at all - free ZVS but only when I'm lucky.

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