| 摘要 |
PURPOSE:To improve the control accuracy in comparison with the conventional ON/OFF-control of refrigerator and reduce the variation width of the temperature in the refrigerator, also elongate the life of the refrigerator by adopting the inverter control system for controlling the cycle and the voltage for a motor driven compressor. CONSTITUTION:For cooling operation, the temperature in a refrigerator is set by means of a variable resistor 11, and the real temperature in the refrigerator is detected by a thermistor 9, and said vlues are read and input into a microcomputer 7 from input terminals IN1 and IN2. Therefore, when the temperature in the refrigerator rises, the microcomputer 7 detects said rise, and outputs are transmitted into an inverter part 13 from output terminals OUT1, OUT2, and OUT3, and the cycle and the voltage of the three-phase voltage for supplying current to a compressor motor are increased. Therefore, the number of revolution of the compressor motor increases, the cooling capacity increases, and the temperature in the refrigerator lowers to a set value. When the temperature in the refrigerator is reduced excessively, the number of revolution of the compressor motor 2 decreases conversely. Thus, the temperature in the refrigerator can be controlled nearly constant. |
