FAN MOTOR CONTROL CIRCUIT FOR REFRIGERATOR

摘要

PROBLEM TO BE SOLVED: To enable a variable speed control corresponding to a load of a compressor to be attained not only for the compressor but also for a fan motor in a refrigerator and a fan motor in a machine chamber with substantially no cost increase while a general specified DC power supply is being used. SOLUTION: A chopper signal C1 for use in changing an output electrical power of a switching element 3 for a compressor is applied to the switching element 3 for the compressor driving the compressor 7. This chopper signal C1 is multiplied by a weighing coefficient k1. Chopper signals C2, C3 in which an offset value k2 is subtracted or added are applied to a switching element 4 for the fan motor in the refrigerator for driving the fan motor 10 in the refrigerator and a switching element 5 for the fan motor within the machine chamber for driving the fan motor 11 in the machine chamber.