| 摘要 |
PURPOSE:To prevent the capacity-down of refrigerating cycle by frequency release, by increasing the operation frequency, such that the current value does not exceed the current limit value at which frequency release operates, without increasing the frequency up to increase instruction frequency when the presumed current value is at a value at which the frequency release operates. CONSTITUTION:An inverter part has a rectifier circuit 2, connected to a power source 1, and a transistor, connected to this rectifier circuit 2, and the transistor 3 becomes the driving transistor for driving a compressor driving motor 6. This detects the preset input current value, and presumes the input current value after frequency increase based on the preset input current-operation frequency from this detection value, and increases operation frequency, such that the current value does not exceed the current limit value at which frequency release operates, without increasing the frequency up to the increase instruction frequency when the presumed current value is at a value at which the frequency release operates. |
