FIELD: transport engineering; traction DC drives of electric cars. SUBSTANCE: in proposed electric drive power converter has two series connected control switch elements shunted in opposite directions by back diodes. Reservoir capacitors are connected in series with converter terminals. Use of contactor with three making power contacts and one breaking interlock contact makes it possible to use power voltage converter for charging traction storage battery. EFFECT: improved mass and overall dimension characteristics of unitized traction DC electric drive. 1 dwg
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