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Temperature-controuer

2017-08-19 17:22  
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When power is applied, the thermistor, a negative tc device, is at a high value. A1 saturates positive. This forces the LT3525A switching regulator`s output low, biasing Ql. As the heater warms, the thermistor`s value decreases. When itsinputs finally balance, A1 comes out of saturation and the LT3525A pulsewidth modulates the heater via Q1, completing a feedback path.
Temperature-controuer

A1 provides gain and the LT3525A is highly efficient. The 2-kHz, pulse-width modulated heater power is much faster than the thermal loop`s response, and the oven sees an even, continuous heat flow.



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