| 摘要 |
<p>PURPOSE:To enable to operate an air conditioner by connecting the same directly to the domestic power source, by detecting the operating current of the air conditioner, and lowering the frequency of current supplied to the compressor when the operating current exceeds a prescribed value, thus controlling the operating current not to exceed the maximum value of a tolerable range. CONSTITUTION:A compressor 12 of an air conditioner is supplied with driving force from an electric power source 13 and produces a frequency instruction signal corresponding to the room temperature detected by a room temperature detecting means 14. The room temperature is controlled by controlling the speed of rotation of the compressor by applying the frequency instruction signal produced by the compressor 12 to a frequency varying means 15 and thereby varying the frequency of current supplied to the compressor 12. Here, in order to prevent increasing of the operating current to a level higher than the rated power source current along with increasing of load, the speed of rotation of the compressor 12 is lowered by detecting the power source current of the means 15, producing a frequency reducing signal from a current detecting means 16 when the power source current of the means 15 has exceeded a prescribed value, and applying the frequency reducing signal to the means 15.</p> |
