DEVICE FOR BALANCING THREE-PHASE VOLTAGE AT OUTPUT OF ELECTRONIC SEMICONDUCTOR CONVERTER WITH UNBALANCED LOAD Russian patent published in 2022 - IPC H02J3/26 

FIELD: electrical engineering; electric power engineering; power electronics.

SUBSTANCE: device for balancing the three-phase voltage at an output of an electronic semiconductor converter with an unbalanced load includes electrically connected three-phase bridge inverter consisting of three upper and three lower transistors, an additional transistor half-bridge, which consists of two transistors, an electric power source, and a switching control device based on a microcontroller. In this case, three outputs of the inverter are connected to a three-phase load. The additional transistor half-bridge is connected via a choke to a common point of the three-phase load. A relay controller and a generator of a voltage preset value, which is connected by three inputs to the switching control device by upper transistors, are integrated into the switching control device, the fourth input of the voltage generator is connected via the first voltage sensor to the electric power source, one output of the voltage generator is connected to a relay voltage regulator, the first input of the relay controller is connected to the voltage generator, the second input is connected via the second voltage sensor to a zero wire relatively to a “minus” bus of the inverter, and two outputs of the relay controller are connected to the additional transistor half-bridge.

EFFECT: using the device, the output voltage of a three-phase bridge inverter is balanced when phase loads change in a wide range of simple ones.

1 cl, 5 dwg