| 摘要 |
PURPOSE:To control a current balance by a simple circuit configuration and to connect arbitrary number of unit inverters in parallel by providing a current transformer and a reactor at an output, providing the average value of output currents and comparing it with an output current value. CONSTITUTION:The output of a PWM signal generator 9 is inputted to a current balance controller 8. The output currents of unit inverters detected by current transformers 4, 5 are inputted to the controller 8. The controller 8 calculates its output current by an adder and a divider to obtain an average value of the inverters connected in parallel. The currents of the inverters are detected by the transformers 4, 5. If the current of the inverter is larger than the average value, a PWM pulse width is controlled to be shortened by a predetermined time. If it is smaller than the average value, the width is controlled to be lengthened by a predetermined time. |
