Furnace temperature control circuit composed of the AD590

Published:2011/8/23 22:27:00 Author: | Keyword: Furnace, temperature control | From:SeekIC

The furnace temperature control circuit which is composed of the AD590 is as shown in the figure. In this circuit, the output current of AD590 is compared with the benchmark current at the reverse phase input port of the Al, this current is decided by the -lOV stable voltage of the high performance voltage-regulator tube AD581; A2 is the filter; A3 is the addition calculator, it amplifies the error signal and adjusts the pulse width drive heater RL according to the temperature value. In order to get the most stable dynamic characteristics, we use the silicon grease to paste the AD590 on the heater RL. Due to the output current sensor AD590 is proportional to the temperature, we can adjust the film resistance of the chip, when the temperature is 298·2K(25℃), the output current is 298·2μA. So we can control the temperature of the furnace.



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