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Baluncore
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I don't think it is necessary to ground the sources if the current path is low-voltage and the gate voltage is high enough to turn the switches on, while being small enough to not turn on the Zener diodes used for gate voltage protection.artis said:But I can also ground the source with respect to the gates at all times within the gate drive circuit, can I not?
It shouldn't affect the voltage/current of the main path through the FET's nor the gate drive circuit itself because the two circuits - the power and gate drive one don't interact.
You can ground the sources if you do not ground any other part of the switched current circuit. There may be problems with grounding the sources if the inductors share a common node.
You need to consider protection of the MOSFETs from the flyback of the inductor voltage.