Patent ID: 7134295

Claim:
A compressor unit comprising a compressor, an inverter for driving the compressor, and an over-current protective device for protecting the inverter against an output over-current, wherein a working current value of the over-current protective device has temperature characteristics varying according to an ambient temperature, the compressor unit further comprising: a temperature sensor for detecting the ambient temperature, and a control part for controlling an output voltage of the inverter on occasion of start of the compressor on basis of the ambient temperature detected by the temperature sensor, wherein the working current value of the over-current protective device has temperature characteristics in which the lower ambient temperature results in the larger working current value and in which the higher ambient temperature results in the smaller working current value, and wherein the control part determines the inverter output voltage on occasion of the start on basis of the ambient temperature detected by the temperature sensor so that the lower the ambient temperature detected by the temperature sensor is, the higher the inverter output voltage on occasion of the start is and so that the higher the ambient temperature detected by the temperature sensor is, the lower the inverter output voltage on occasion of the start is.