FIELD: electronics. SUBSTANCE: converter has sealed case 1 whose bottom section 2 accommodates semiconductor power devices 3 assembled with finned heat sinks 4 placed in environment of low-boiling fluoride-containing liquid intermediate coolant 5; its intermediate section 6 houses transformer-and-choke equipment 7, convective heat exchanger 8, and convective liquid silicone intermediate coolant 9. Heat exchanger- condenser 10 is mounted in top section 11. EFFECT: improved reliability, reduced consumption of expensive intermediate coolant. 4 cl, 1 dwg
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