This develops a single-chip microcomputer intelligence controller for the minor gas-fired boiler which is domestic heating equipment on the basis of investigation of heating demand widely. The research goals are to to improve the control quomodo of domestic heating, to increase economics of heating, to ameliorate living service facilities of people.

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LM250

0℃, U O=0V;100℃, U O=5V.
I2 =I0+ I1 ,    U O= I1•(W3+R3)
 0℃ ,  I 2= 273.15µA,   U O=0V,
I1=0 ,I0=12=273.15µA,
R 2+W2=2.5V÷ 273.15µA =9.15KΩ
R2=9KΩ,  W 2=400Ω.

100℃, U O=5V,
12=273.15µA +100µA=373.15µA,   I 0+11=373.15µA ,  I0=273.15µA,   I 1=100µA,
  W3+R3=5V÷100µA=50KΩ
 R3=47KΩ,  W 3=5KΩ.
  R4=(R2+W2)//(R3+W3)=9.1KΩ
0℃,  P 2  :  UO=0V;  AD590 :   100℃,   W 3,  U O=5V.

 

 

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