AUXILIARY CONVERTOR

摘要

An auxiliary convertor comprises an auxiliary power unit (1), a current detection unit (2), a voltage transformation unit (3), a filtering unit (4), an output voltage detection unit (5) and an auxiliary control unit (6). The auxiliary power unit is provided with an input end which can be connected to a direct current power supply, and is used for converting a direct current of the direct current power supply to a three-phase alternating current. The voltage transformation unit is used for voltage-transforming and isolating the three-phase alternating current which is output by the current detection unit. The filtering unit is connected to an output bus of the voltage transformation unit in parallel, and is used for filtering the three-phase alternating current, so as to output a three-phase quasi-sinusoidal voltage. The output voltage detection unit is used for conducting full-wave rectification on the three-phase quasi-sinusoidal voltage, generates a voltage feedback signal and transmits same to the auxiliary control unit. The auxiliary control unit is used for receiving the voltage feedback signal, generates a trigger pulse signal through closed-loop voltage control, and controls the auxiliary power unit to output a three-phase alternating current with a stable voltage. The auxiliary convertor can output a stable three-phase alternating current using closed-loop voltage control.