Sanyo Electric Co., Ltd.

Hajime Takada

Tomonori Isobe

Tsugio Nakae

Hajime Shimayama

Katsuhiro Ohkubo

Hiroyuki Nunokawa

Mitsuru Toyota

Minoru Katou

An air conditioner which has a controller equipped with heat-producing electrical parts and in which the driving current of a compressor, etc., is controlled by the controller, includes a temperature sensor which is provided to or in the vicinity of at least one heat-sensitive electrical part (for example, a power transistor) of the electrical parts and adapted to detect the temperature of a heat-sensitive electrical part, and means for stepwise or linearly reducing the upper-limit value of the driving current of the compressor in accordance with the increase of the detected temperature when the temperature detected by the temperature sensor is higher than a predetermined value.

Air conditioner

An air conditioner for exchanging heat from a refrigerant to the outside and adjusting at least one of room temperature and humidity to desired temperature and humidity and having a 1/f fluctuation function for controlling an air supplying means for supplying conditioned air to the room so as to vary the air supplying amount in multiple levels corresponding to a designated reference air amount and irregularly. A reference air amount of the air supplying means can be designated and there is an air amount control for controlling the air supplying means corresponding to the designated reference air amount, and a fluctuation width designates a fluctuation width (volume of the air amount) corresponding to the air amount designated. When the 1/f fluctuation function is employed, the fundamental functions (coolness, warmness, and so forth) of the air conditioner are improved. In addition, the noise of the air conditioner is reduced and the comfort of the user is improved.

An air conditioner includes a means for detecting a frequency for controlling an AC motor of a compressor, a means for determining whether the frequency during operation converges to within a predetermined range, of the frequency required to maintain the designated temperature, and a means for shifting the designated temperature by a predetermined temperature when the frequency converges to the predetermined range. The temperature is shifted when the frequency decreases and converges to the predetermined range while the air conditioner operation causes the room temperature to approach the designated temperature. Thus, even if the body temperature of a user decreases because, for example, he is sleeping, the stable state of the operation can be accurately determined and thereby a comfortable temperature is maintained.

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Saitama-ken, Japan

Hajime Takada