555 fridge automatic temperature controller circuit

Published:2011/6/16 2:31:00 Author:TaoXi | Keyword: 555, fridge, automatic, temperature controller | From:SeekIC

As the figure 13-14 shows, the fridge automatic temperature controller circuit is composed of the step-down voltage-stabilizing circuit, the automatic temperature control circuit, the manual defrosting control circuit and the relay control circuit. This circuit has all functions of the Toshiba GR204E automatic defrosting type automatic temperature control circuit. The step-down voltage-stabilizing circuit is the +12V voltage source of the controller. The IC3(555) is connected into the bistable operating mode, the maximum temperature detection circuit is composed of the RP3 and RT3, the minimun temperature detection circuit is composed of the RP2，R2 and RT2, the RT2 and RT3 use the NTC negative temperature coefficient thermistor. When the temperature of fridge increases, the resistance of RT reduces.



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