On-off temperature control circuit with Integrated flip-flop 5B

Published:2011/8/26 1:59:00 Author:Jessie | Keyword: temperature control circuit, integrated flip-flop | From:SeekIC

These three circuits are supplied by AC 220V voltage, and the given temperature range is 5 ℃ ~ 30 ℃, and it uses integrated trigger TDA1024 and Triacs BT139,and the heating power is 2KW. Room temperature (actual temperature) is measured by the thermistor, which is connected in a branch circuit of the bridge. The potentiometer R can adjust the given stable value. If the actual voltage value of pin 5 exceeds the given threshold voltage of pin 4, then the thyristor gate has no trigger pulse. On the contrary, there is trigger pulse, and the heating resistor RL gets power. In order to make the comparator has the minimum hysteresis, pin 3 is hung up, and the temperature difference is about 0.3K.



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