DEVICE OF GUARANTEED POWER SUPPLY Russian patent published in 2017 - IPC H02J9/06 H02J7/00 

FIELD: electricity.

SUBSTANCE: device comprises of the identical first and second frequency converters (FC), each having respective input terminals A, B and C. The input terminals of the first FC are configured to connect to a supply line of three-phase AC current, and the input terminals of the second FC are designed to connect to a DC power source. One of the input terminals of the second FC is adapted to connect to the positive terminal of DC source, and the other two - to the negative terminal of the latter. Each FC includes output terminals for connecting a three-phase load, three identical three-phase transformers, each of which has the first and second input and output three-phase windings. The starting terminals of the phase windings of the first three-phase input winding and the ends of the phase windings of the second three-phase input windings are connected to respective input terminals A, B, C. The other terminals of each three-phase input winding are connected to a switching element corresponding to the winding in the form of a three-phase diode bridge with an electronic key in a DC circuit. The phase windings of three-phase input windings in one three-phase transformer are series-connected to the input terminals A, B, C and the phase windings of the three-phase input windings of the other two three-phase transformers are series-connected to the respective input terminals B, C, A and C, A, B. The similarly-named phase windings of three-phase output windings of three-phase transformers are series-connected in three branches making a star-connected circuit and a three-phase output for the connection to a three-phase load.

EFFECT: simplified guaranteed power supply devices and expanded functional and operational capabilities.

3 cl, 7 dwg