As noted earlier, the zener diodes limit the FET gate to source voltage to the maximum specified in the spec sheet. A 15 Volt zener, rated at at least one Watt, is commonly used in most ZVS circuits. The zener limiting resistors not only limit the maximum dissipation of the zeners but also drive the gate to source capacitance of the FETs. A separate regulated gate supply voltage, should be set less than the zener voltage and the nominal FET drain voltage. Or, the zener can be eliminated or substituted with a reverse-biased diode. If the gate supply voltage is at the same voltage as the supply voltage, the zener dissipation should be checked for the operating voltage.
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