Method for adjusting the interval of defrosting in a refrigerator system for electronic control of refrigerating in a refrigerator and control circuit of electronic refrigerating

摘要

A refrigeration control system with self-adjusting defrost interval is provided. The system includes an improved control circuit including an external comparator and a microprocessor having a compressor output drive function and a defrost output drive function. The comparator is linked with the microprocessor with circuit elements for detecting the time period of a defrost operation, comparing the time period with predetermined defrost period limits, generating an output control signal in response to a predetermined relationship between the time period and the limits, and adjusting the defrost interval in response to the control signal whereby the defrost operation is maintained within a preferred preselected time period.