UNIT TO CONTROL OPERATION OF THREE-PHASE INVERTER Russian patent published in 2015 - IPC G01R21/00 

FIELD: electricity.

SUBSTANCE: unit intended to control operation of three-phase inverter comprises direct voltage source connected to the inverter input, outputs of the latter are coupled to two pairs of linear voltage and current sensors and load, two analogue multipliers, which inputs are connected to sensors of the respective linear voltage and current, and output through low-frequency filters are coupled to inputs of one of the two summators. Active power indicator and the first input of analogue divider are connected to the summator output and power coefficient indicator is connected to output of the first input of analogue divider. At that the device is equipped with the second pair of analogue multipliers with low-frequency filters, two 90° phase shifters, unit for calculation of vector sum module, null element and total power indicator and indicator of inverter load mode. At that the first inputs of the second pair of analogue multipliers are connected to linear voltage sensors, the second inputs through 90° phase shifters are connected to linear current sensors and outputs through low-frequency filters are connected to inputs of the second summator, output of the latter through null element is connected to indicator of inverter load mode and directly to one of inputs of the for calculation of vector sum module, the other input of the above unit is coupled to output of the first summator and its output is coupled to the second input of analogue divider and total power indicator.

EFFECT: reliability improvement.

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