H Bridge shoot through protection

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http://forum.allaboutcircuits.com – Good Morning All I am building a +/- 63volt square wave invertor for AC Tig welding from a high current DC 63volt supply. I am using 4 x 100amp thyristor in an H Bridge, capacitively commutated by 4 mosfets. Driving a Purely restrictive load.(I think arc is Purely restrictive) I want to add some simple shoot through protection for the thyristors Any ideas or options? thanks David (Embedded)