A COMPRESSOR CONTROL CIRCUIT

摘要

A compressor control circuit adapted to a refrigerator comprises a compressor including a bruhsless D.C. motor (15); a power circuit for separating an A.C. power source from a D.C. power source (Vw) to drive the brushless D.C. motor; a two phase control circuit (14) for varying the operation speed of the brushless D.C. motor (15) in response to the temperature of a freezing chamber (33); a voltage adjustment switching circuit (23, 24) for selecting the voltage of a power source circuit responsive to the load condition; an operation control circuit for enabling the on-off operation of the brushless D.C. motor (15) to be continued according to the on-off of a load sensor in the freezing chamber (33); and a protecting circuit (30) for stopping the brushless D.C. motor (15) and cutting off the power source under the overload or binding condition of the compressor, in which the control circuit adjusts the temperature of an evaporator by the continuous variable speed operation of the brushless D.C. motor, so that the continuous temperature control characteristics of the evaporator is superior, and the freezing and refrigerating chambers (33) of a refrigerator are kept at a constant accurate temperature without the temperature ripple.