Patent ID: 6181538
Filing Date: 2001-01-30
Classification: F25B,Y02B

Abstract:
An apparatus, comprising:a compressor receiving a first substance uncompressed and outputting said first substance compressed, said compressor being driven by a primary power;a sensing unit sensing revolutions per minute of said compressor; anda power controller detecting a difference between said revolutions per minute of said compressor and a predetermined quantity of revolutions per minute, said power controller performing one of supplying said primary power to said compressor and cutting off said primary power to said compressor according to said difference detected, said power controller cutting off said primary power to said compressor when said revolutions per minute of said compressor correspond to a first quantity of revolutions per minute above said predetermined quantity of revolutions per minute and then decrease to correspond to a second quantity of revolutions per minute below said predetermined quantity of revolutions per minute and then stay below said predetermined quantity of revolutions per minute for a predetermined quantity of time.