Inverters used for room air conditioners, which are household-use air conditioners, cause the outflow of harmonic current with a frequency other than the power supply frequency to the input current. This harmonic current is regulated and measures to meet the regulations are required and we have responded to the regulatory. On the other hand, if the waveform of the power supply voltage is distorted, the input current is distorted and the current increases and there are problems such as the deterioration of the efficiency and fuses blowout due to overcurrent in some cases. Therefore, Mitsubishi Heavy Industries Thermal Systems, Ltd. calculated the distortion factor of the input current and conducted control so as to reduce it. As a result, it was confirmed that the total distortion factor could be suppressed to 1/5 to 1/2 and reports in this report.
