Daikin Industries, Ltd.

Morikuni Natsume

Satoshi Yagi

Yasuaki Miyaba

Hiroshi Doumae

Hisashi Sumida

Takuya Kotani

Mario Hayashi

Hirotaka Saruwatari

Hiroyuki Matsuura

An object of the present invention is to reduce electrical noise in accordance with the necessity of a countermeasure taken against electrical noise without changing a structure of an expansion valve. In a case where a judgment result as to whether or not the countermeasure against electrical noise is taken is affirmative, a drive timing (interval) of an expansion valve () is increased. Further, a driving amount is reduced. Accordingly, a flow of a refrigerant is made slow, whereby it is possible to reduce generated electrical noise while performing instructed temperature control.

Refrigerant cycle and method of controlling the same

After the power source to the control substrate is turned on, power is supplied to the compressor driver and the fan driver. Then, when it is determined that an indoor unit is in operation, the compressor driver and the fan driver are operated. Meanwhile, when it is determined that the indoor unit is not in operation, after the lapse of ten minutes or twenty minutes under a predetermined setting, the power to the compressor driver and the fan driver is cut. When the operation of the indoor unit is started again, power is supplied to the compressor driver and the fan driver.

Load driving device, outdoor unit of air conditioner, and driving method of load

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Osaka, Japan

Morikuni Natsume