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