| 摘要 |
PURPOSE: To obtain balanced output current of a plurality units of PWM inverters by obtaining deviation between the total output current of each phase of all inverters and a momentary output current value of each phase of each inverter and then automatically switching operation of PWM signal generator output to the preset value. CONSTITUTION: An inverter 7 inputs outputs of current detectors 72u, 72v, 72w and outputs of current detectors 82u, 82v, 82w of the second inverter 8 to adders 73u, 73v, 73w and obtains the added total output current of each phase. The current deviation detecting circuits 75u, 75v, 75w input outputs of adders 73u to 73w and outputs of the current detectors 72u to 72w of the individual inverter 7 through gain regulators 74u to 74w to obtain and amplify the momentary value of the output current deviation of each phase. Next, the amplified output by the current deviation detecting circuits 75u to 75w is given to the operation amount switch 17. Thereby, an output current of the inverter becomes smaller than that of the other one to reduce a current deviation value. |
