UNINTERRUPTED SECONDARY POWER SUPPLY DEVICE Russian patent published in 2023 - IPC H02J9/06 

FIELD: power electronics.

SUBSTANCE: invention can be used for guaranteed power supply of particularly critical equipment with secondary voltage from two on-site AC networks with support from a battery. A device for guaranteed secondary power supply is proposed with parallel support of secondary voltage from the first and second AC power lines and connection of the battery to the load bus during an emergency shutdown of the facility network, containing rectifiers (2) and (3) AC voltage from the first and second lines, power supply soft start devices (12) and (13), key stabilized converters (4) and (5), connected in parallel through current sensors (14) and (15) to the load bus, service power supplies (8) and (9), controllers (19) and (20), as well as a battery (17) to support the DC power line, a charger (18), a switch (1), isolation diodes (6) and (7), a service power supply (16) and controller (21), which collects control information from controllers (19) and (20) via the data bus and controls the correction of the reference voltages of the converters (4) and (5) to equalize the output currents with simultaneous power supply from the first and second AC lines, and in the event of an emergency shutdown of the facility’s network, it implements a transition to power supply from the DC line.

EFFECT: use of levelling the output current of the converters (4) and (5) in the main operating mode with simultaneous consumption from the first and second AC lines and switching to the DC power supply line in the event of an emergency shutdown of the facility network allows for increased reliability and expands the possibilities of using the proposed uninterruptible device secondary power supply to ensure trouble-free operation of critical equipment.

1 cl, 4 dwg