the circuit of temperature controller(16)

Published:2011/6/25 19:20:00 Author:Ariel Wang | Keyword: temperature controller | From:SeekIC

When the mains switch gets through,the 220V AC voltage is reduced by T,commutated by RU,filtered by C1 and regulated by IC.Then it generates +12 voltage.It is for the temperature detect control circuit.At the same time,VL is lighted by R.When you use it,you can set the upper limit and lower limit of temperature by the thermelometer Q.When the controlled temperature is lower than the lower limit of the temperature,the moving contact of Q is connected with the contactor of the lower limit.The relay K1 and KM are conducted to pull in. EH is conducted to heat.When the temperature rises,the moving contact of Q is disconnected with the contactor of the lower limit.But as the normally open contacts K1-1 of K1 is closed,K1 and KM stay pull-in.EH stays conducted.



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