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Zero voltage switching
Zero voltage switching typically defines an SCR soft start where you either turn the device on or off when the voltage crosses 0 volts in an AC circuit. PWM is a completely different concept where you regulate the amplitude and time of a DC pulse to mimic an AC sign wave with the power devices turning on and off the RMS.
If the input frequency is high enough, one can implement zero voltage switching by waiting from the "ideal" PWM switch point until the next zero crossing. This isn't very useful with 50Hz or 60Hz mains supply, but if one can choose the input power frequency, it does become an option.
If the input frequency is high enough, one can implement zero voltage switching by waiting from the "ideal" PWM switch point until the next zero crossing. This isn't very useful with 50Hz or 60Hz mains supply, but if one can choose the input power frequency, it does become an option.