Abstract: A compressor control circuit adapted to a refrigerator comprises a compressor including a brushless DC motor, a power circuit for separating an AC power source from a DC power source to drive the brushless DC motor, a voltage adjustment switching circuit for selecting the voltage of a power source circuit responsive to the load condition, and a motor control circuit including a two phase control circuit for varying the operation speed of the brushless DC motor in response to the temperature of a freezing chamber, an operation control circuit for enabling the on-off operation of the brushless DC motor to be continued according to the on-off operation of a load sensor in the freezing chamber, and an over-load protecting circuit for stopping the brushless DC motor and cutting off the power source under the overload or binding condition for the compressor.