This controller is used to control the temperature level of the PC. Some of the largest integrated circuits become quite hot and if the temperature inside the PC becomes too high. This, in turn, could lead to failure of devices and eventually of the PC. If you assume the maximum working temperature of your PC is 55 C for safe working and this controller uses a temperature sensor (LM 35) and a comparator (CA3140) which disconnect the PC from the power supply whenever the temperature of your PC rises above 55 C.
Main power supply is rectified by a bridge rectifier comprising diodes D1 through D4, divided by a resistor network comprising R1 and R2, and stabilized by zener diode ZD1.Capacitor C1 filters the ripples. Using preset VR1 you can set the reference voltage. The reference voltage at non-inverting pin 3 of the comparator is set to the temperature value of the PC is 55 c. when the temperature of the PC is 55 C , the voltage at the inverting input (pin2) of IC2 is lower than the voltage at the non-inverting input (pin3).In this stage, the comparator output at pin 6of IC2 is high.
This high output triggers triac 1(BT136), providing mains power to operate the PC. When the temperature of the PC increases above 55 C, the inverting input (pin 2) of IC2 also goes above the non-inverting input at pin3 and hence the comparator output goes low. This stops triggering of traic 1 (BT 136) preventing mains power supply from reaching the PC. This circuit assembles on any general-purpose PCB in the form of a PC expansion card, so you can use it as an add-on card to any PC with safety temperature device.
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