FREQUENCY CONVERTER WITH BUILT-IN SOURCE OF RESERVED POWER Russian patent published in 2018 - IPC H02M5/451 H02J9/04 B60L11/12 

FIELD: electricity.

SUBSTANCE: in the frequency converter with the built-in backup power source containing the input active rectifier to the output of which the storage capacitor connected to the output of the DC voltage converter and the input of the independent variable voltage inverter to which the braking resistor is connected is additionally charged, the input of which is connected to the input active rectifier, the battery connected to the output of the charging and charging device and the input DC converter, and a fixed frequency voltage inverter, whose input is connected to the input active rectifier via a storage capacitor. In carrying out the invention the following occurs: ensuring smooth operation of the lift equipment without stopping the cab and the switching from the three-phase power to single phase with the loss of line voltage, the use as a backup power source of one of the battery for the frequency converter and for elevator control station, optimising power consumption lift from AC current, the possibility of providing energy recovery during braking winch mains supply and storage of it in accumulator Atar, comfort and safety of increasing the use of lifting equipment and exception situations "jamming" of people in the car, as well as the implementation of fire safety rules applicable to the elevators, even during a power outage.

EFFECT: ensuring the uninterrupted operation of lift equipment without stopping the cab and switching from three-phase power to single-phase power supply when the mains voltage is lost.

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