Thermal furnace temperature regulating circuit

Published:2011/5/9 8:59:00 Author:Nicole | Keyword: furnace, temperature regulating | From:SeekIC

In general regulating circuit, the waste heat sensor is used as voltage divider, it is hard to obtain good linear relationship. The figure (a) may have linear relationship. A few waste heat devices can be controlled by a external control device, then it will produce a DC voltage which has relation with external condition, the value is between 0.91~1.43V. In figure (a), the input terminal 2 switch voltage U7 of operational amplifier OP2 is controlled by the attenuation ratio: RP3+R6/R7, it is about 0.91V, when the control voltage Us=0. The figure (b) is a performance curve of circuit. When control voltage Us≦0.91V, hysteresis loop is about 20%, because the resistance R7 is in action in this region.



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