Voltage converter with {HEAD ~ GTO thyristors} in {TAIL ~ series connection} with at least a choke with freewheeling circuit 
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Voltage converter with { HEAD ~ GTO thyristors } in { TAIL ~ series connection } with at least a choke with freewheeling circuit
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH