| 摘要 |
PROBLEM TO BE SOLVED: To enable determination of an estimated given value of a high pressure saturation temperature with high precision, to maintain reliability at a high level without being influenced by a source voltage and a power factor, and to improve operation efficiency. SOLUTION: A voltage VIN and a current I IN on the secondary side of an active filter are detected (a step S51). From the detecting results, a consumption power of a compressor is calculated (a step S52). An output frequency FOUT of an inverter circuit and an intake pressure LP of a compressor are detected (a step S53). Based on the calculating results, a high pressure value HP is calculated (a step S54). Further, a high pressure equivalent saturation temperature TDS is calculated (a step S55). |
