Simple and practical constant temperature controller circuit

Published:2011/5/18 18:55:00 Author:TaoXi | Keyword: Simple, practical, constant temperature controller | From:SeekIC

The working principle is: ST is the WTQ-288 type electrical contact point pressure type thermometer, when the temperature of incubator reduces to the lower limit, ST's pointer contacts with the lower limit contact point, the bidirectional thyristor is forced to trigger conduction, and you connect heater RL's power supply, so the temperature of incubator rises. ST's pointer turns and separates from the lower limit contact point. Although the trigger circuit is disconnected, but for the capacitance C's phase shifting effect, when the supply voltage crosses zero, the capacitive current is not zero, so when the power is inverted, it still provides the trigger current for the triac to keep the conduction.



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