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±¾¼òÊöÊÇ˵Ã÷ NTC ÈÈÃôµç×èÆ÷¶ÔζȵIJâÁ¿¡£ÈÈÃôµç×èÆ÷°Ñζȵı仯ת»»Îªµç×è×èÖµµÄ±ä»¯£¬ ÔÙÓ¦ÓÃÏàÓ¦µÄ²âÁ¿µç·°Ñ×èÖµµÄ±ä»¯×ª»»ÎªµçѹµÄ±ä»¯£»È»ºóͨ¹ýоƬ»ò´¦Àíµç·,¿ÉÒÔ°ÑÄ£ÄâµÄµçѹֵת»»ÎªÊý×ÖÐźÅ£¬¶ÔÊýÖµÐźŽøÐд¦Àí¿ÉÒԵõ½ÏàÓ¦µÄζÈÖµ¡£Ò²¾ÍÒôÌع«Ë¾³£Ìáµ½µÄÄ£Êýת»». 

  1.1 ÈÈÃôµç×èÆ÷

ÈÈÃôµç×èÓеç×èÖµËæζÈÉý¸ß¶øÉý¸ßµÄÕýζÈϵÊý

PositiveTemperatureCoefficient ¼ò³Æ  PTC 

ÈÈÃôµç×èÓеç×èÖµËæζÈÉý¸ß¶ø½µµÍµÄ¸ºÎ¶ÈϵÊý

Negative Temperature Coefficient ¼ò³Æ NTC ÈÈÃôµç×è¡£

NTC ÈÈÃôµç×èÆ÷£¬ÊÇÒ»ÖÖÒÔ¹ý¶É½ðÊôÑõ»¯ÎïΪÖ÷ÒªÔ­²ÄÁÏ£¬²ÉÓõç×ÓÌմɹ¤ÒÕÖƳɵÄÈÈÃô°ëµ¼ÌåÌÕ´É×é¼þ¡£ÕâÖÖ×é¼þµÄµç×èÖµËæζÈÉý¸ß¶ø½µµÍ£¬ÀûÓÃÕâÒ»ÌØÐÔ¿ÉÖƳɲâΡ¢Î¶Ȳ¹³¥ºÍ¿ØÎÂ×é¼þ£¬ÓÖ¿ÉÒÔÖƳɹ¦ÂÊÐÍ×é¼þ£¬ÒÖÖƵç·µÄÀËÓ¿µçÁ÷¡£

 

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ϱíÊÇÑ¡Óà NTCÈÈÃôµç×èÆ÷ MF52-502F3950B£¬»ùÓÚ¾«È·µÄR-T ÇúÏߣ¬À´¶ÔζȽøÐо«È·µÄ²âÁ¿¡£ 

     1.2 µç×裭ζȹØϵ

Èç±íA1 Ëùʾ£¬NTC ÈÈÃôµç×èÆ÷ MF52-502F3950B ¸÷ζȵãµÄµç×èÖµ£¬¼´µç×裭ζȹØϵ±í¡£´ÓÌṩµÄµç×裭ζȹØϵ±íÖпÉÒÔ ¿´³ö   NTC ÈÈÃôµç×èÆ÷MF52-502F3950BµÄ²âη¶Î§Îª [-55¡æ,125¡æ]£¬Æäµç×èÖµµÄ±ä»¯·¶Î§Îª[250062Ω,242.64Ω]¡£  

±íA1MF52-502F3950BËùʾ:

ζÈ(¡æ)

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250062

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237404

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225239

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213575

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202412

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181580

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171895

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162684

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153933

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145638

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137753

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130293

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123231

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116550

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110232

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104261

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98621.7

-37

93295.5

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88267.4

-35

83521.8

-34

79043.9

-33

74819.2

-32

70833.9

-31

67074.7

-30

63529

-29

60184.6

-28

57030.2

-27

54054.7

-26

51247.9

-25

48600

-24

46101.6

-23

43744

-22

41519

-21

39418.8

-20

37435.9

-19

35563.5

-18

33795

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32124.4

-16

30545.8

-15

29053.8

-14

27643.3

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26309.5

-12

25047.9

-11

23854.2

-10

22724.6

-9

21655.3

-8

20642.7

-7

19683.6

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18774.9

-5

17913.6

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17097.1

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16332.9

-2

15588.4

-1

14891.5

0

14230

1

13601.9

2

13005.4

3

12438.7

4

11900.1

5

11388.2

6

10901.3

7

10438.3

8

9997.74

9

9578.41

10

9181

11

8799

12

8436.83

13

8091.73

14

7762.78

15

7449.16

16

7150.04

17

6864.7

18

6592.4

19

6332.49

20

6084.32

21

5847.31

22

5620.89

23

5404.53

24

5197.72

25

5000

26

4810.9

27

4630.01

28

4456.93

29

4291.28

30

4132.69

31

3980.83

32

3835.38

33

3696.03

34

3562.49

35

3434.5

36

3311.78

37

3194.1

38

3081.22

39

2972.92

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2869

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2769.24

42

2673.47

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2581.5

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2493.17

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2408.3

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2326.76

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2248.38

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2173.04

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2100.6

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2032

51

1963.92

52

1899.44

53

1837.4

54

1777.68

55

1720.2

56

1664.85

57

1611.54

58

1560.2

59

1510.74

60

1463.08

61

1417.14

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1372.87

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1330.18

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921.17

76

894.22

77

868.18

78

843.02

79

818.69

80

795.17

81

772.43

82

750.44

83

729.17

84

708.6

85

688.7

86

669.44

87

650.8

88

632.76

89

615.3

90

598.39

91

582.02

92

566.17

93

550.81

94

535.94

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521.53

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507.57

97

494.05

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480.94

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468.23

100

453.3

101

443.97

102

432.38

103

421.15

104

410.26

105

399.69

106

389.44

107

379.5

108

369.85

109

360.48

110

351.4

111

342.57

112

334.01

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325.69

114

317.62

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309.77

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302.16

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294.76

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287.57

119

280.59

120

273.8

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267.21

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260.8

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254.58

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248.52

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242.64

 

 

 

 

1.3  ÊýÖµ´¦Àí

 

ͨ¹ý±í A1 µç×裭ζȹØϵ±í¿ÉÒÔºÜÖ±¹ÛµÄ¿´µ½µç×èµÄ±ä»¯·¶Î§´Ó 242.64Ωµ½ 250062Ω£¬ ÔÚ£­55¡æµÄʱºòÆä±íÏÖ³öµÄµç×èÖµÊÇ 125¡æʱËù±íÏֵĵç×èÖµµÄ 1030 ±¶£¬Õâô´óµÄ±ä»¯·¶Î§Ò²ÎªÄ£Êýת»»²âÁ¿´øÀ´ÁËÀ§ÄÑ¡£

²âÁ¿µç·ÈçÏÂͼËùʾ¡£

 

ÈçÉÏͼËùʾ NTC ÈÈÃôµç×è Rv ºÍ²âÁ¿µç×è Rm£¨¾«Ãܵç×裩×é³ÉÒ»¸ö¼òµ¥µÄ´®Áª·Öѹµç·£¬²Î¿¼µçѹVCC_Ref ¾­¹ý·Öѹ¿ÉÒԵõ½Ò»¸öµçѹֵËæ×ÅζÈÖµ±ä»¯¶ø±ä»¯µÄÊýÖµ£¬Õâ¸öµçѹµÄ´óС½«·´Ó³³öNTC µç×èµÄ´óС£¬´Ó¶øÒ²¾ÍÊÇÏàӦζÈÖµµÄ·´Ó³¡£ ͨ¹ýÅ·Ä·¶¨ÂÉ¿ÉÒԵõ½Êä³öµçѹֵ Vadc ºÍ NTC µç×èÖµµÄÒ»¸ö¹Øϵ

±í´ïʽ1£º

ÄÇô½ÓÏÂÀ´µÄÊý¾Ý´¦Àí½«»ùÓÚʽÉÏʽչ¿ª£º²é³ö´¦ÀíоƬҲ³ÆÄ£Êýת»»Æ÷  ADC  µÄ¾«¶È£¬Æä²Î¿¼µçѹΪ 5V£¬Òò´ËÕâÀï¿ÉÒÔÑ¡Ôñ Vref£½5V¡£¸÷ζȵã¶ÔÓ¦µÄ ADC ת»»ºóµÄÊý×ÖÁ¿¿ÉÒÔ¼ÆËã¡£

    ±í´ïʽ2.

Dadc £½  1024*Vadc/5V

½áºÏ±í´ïʽ1ºÍ±í´ïʽ2,¿ÉÒԵóö±í´ïʽ3:
                            Dadc
£½  1024*Rm/(Rv+Rm) 

Èç¹ûÕâÀïÈ¡ ²âÁ¿µç×èRm Ñ¡Ôñ4.7KΩ£¬ÄÇô¿ÉÒÔ¼ÆËã³ö

ÔÚ£­ 55¡æʱ    Ëù¶ÔÓ¦µÄ   Dadc = 1024*1000/(250062+1000) = 4£»

ÔÚ   125¡æʱ   Ëù¶ÔÓ¦µÄ Dadc£½  1024*1000/(242.64+1000)£½ 824¡£

¸ù¾ÝÕâÑùµÄ¶ÔÓ¦¹Øϵ¶ÔÊý¾Ý½øÐÐÔ¤´¦Àí£¬µÃµ½ÈçÏ´¦Àí½á¹ûÈçÏÂÊý¾ÝËùʾ£º 

 

tatic const Int16 NTCTAB2[181] =

{

19,20,21,22,23,24,26,27,29,30,32,34,

36,38,40,42,44,47,49,52,55,57,61,64,

67,71,74,78,82,86,90,95,99,104,109,114,

120,150,156,161,168,172,180,187,194,201,208,215,

222,230,238,247,255,264,272,280,291,302,310,319,

328,338,347,357,367,376,384,395,405,414,424,434,

444,453,464,474,484,494,502,512,522,531,540,551,

560,569,579,586,595,604,613,624,633,642,650,658,

666,673,680,688,696,704,712,719,726,733,741,749,

755,760,767,774,780,785,791,798,804,811,816,821,

827,832,837,842,847,851,856,862,868,873,856,860,

864,868,872,876,879,883,886,890,893,896,899,902,

 

905,908,911,914,917,919,922,924,927,929,931,934,

936,938,940,942,944,946,947,949,951,953,954,956,

958,959,961,962,964,965,966,968,969,970,971,973,

974

};//4.7K

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1.4   ÏßÐÔ²åÖµ 

ÔÚ ADC ½øÐÐÊý¾Ý²É¼¯µÄ¹ý³ÌÖв»¿ÉÄÜÿһ¸öÊýÖµ¶¼ÔÚÕûζÈËù¶ÔÓ¦µÄ ADC ÊýÖµÉÏ£¬ËùÒÔÈç¹ûÔÚ Á½¸öÊý¾ÝµÄÖмäÒ»¶Î¾ÍÒª¶ÔÆä½øÐнøÒ»²½µÄ¾«È·¶¨Î»¡£ÕâÑù¾Í±ØÐëÖªµÀ²É¼¯µ½µÄÊý¾ÝÔÚÊý¾Ý±íÖÐµÄ ¾ßÌåλÖã¬Òò´ËÒª¶ÔÊý¾Ý±í½øÐÐËÑË÷¡¢²éÕÒ¡£ÏßÐÔ±íµÄ²éÕÒ£¨Ò²³Æ¼ìË÷£©£¬¿ÉÒÔÓбȽϳ£¼ûµÄ˳Ðò²é ÕÒ¡¢ÕÛ°ë²éÕÒ¼°·Ö¿é²éÕҵȷ½·¨£¬·ÖÎöÏßÐÔÊý¾Ý±í¿ÉÒԵõ½ÕÛ°ë²éÕÒµÄËã·¨ÊDZȽϸßЧµÄ¡£

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