| 摘要 |
PURPOSE:To effectively protect an inverter by stopping the inverter when the load current of the inverter exceeds the prescribed value and restricting the outputs of a voltage controller and a current limit controller to minimum values. CONSTITUTION:The output frequencies of inverters 2a, 2b are determined by a common reference oscillator 21. The deviations of the output voltages of the inverters 2a, 2b are respectively detected by voltage deviation detectors 18a, 18b, and applied to voltage controllers 11a, 11b and current limit controllers 12a, 12b in the direction to reduce the deviation of the voltage. When the load currents of the inverters 2a, 2b exceed the prescribed value, the inverters 2a, 2b are stopped, and the outputs of the controllers 12a, 12b and 12a, 12b are restricted to the minimum values. Thereafter, the operations of the inverters 2a, 2b are restarted after the prescribed time, and the output voltages and currents are gradually raised. |
