CN103175633B - Electron temperature measuring circuit with self-regulating function - Google Patents

Electron temperature measuring circuit with self-regulating function Download PDF

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CN103175633B
CN103175633B CN201110434184.9A CN201110434184A CN103175633B CN 103175633 B CN103175633 B CN 103175633B CN 201110434184 A CN201110434184 A CN 201110434184A CN 103175633 B CN103175633 B CN 103175633B
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module
self
thermistor
correction factor
circuit
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CN103175633A (en
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徐玉婷
徐栋
张天舜
罗先才
王磊
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CRM ICBG Wuxi Co Ltd
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Wuxi China Resources Semico Co Ltd
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Abstract

The invention discloses an electron temperature measuring circuit with a self-regulating function. The electron temperature measuring circuit comprises a thermistor, a reference resistor, an oscillating circuit module, a temperature measuring counting module, a memory module, a measuring information output module, a self-regulating module and a testing switch, wherein the thermistor and the reference resistor are connected with the measuring information output module through the oscillating circuit module, the temperature measuring counting module and the memory module; the oscillating circuit module is connected with the self-regulating module and the temperature measuring counting module respectively through the testing switch; and output signals of the self-regulating module are sent to the memory module. By means of the electron temperature measuring circuit with the self-regulating function, thermistor temperature curves preset inside can be self-regulated according to central resistance values of the thermistor, correction factors can be saved, and therefore temperature curves of the thermistor with different central resistance values can be better fitted, and measuring errors are reduced while testing costs are reduced; and additionally, the electron temperature measuring circuit is simple in structure and practical, stable and reliable in working performances and wide in application range.

Description

There is the electron temperature measurement circuit of self-regulating function
Technical field
The present invention relates to field of temperature measurement, particularly electron temperature measurement technical field, specifically refer to a kind of electron temperature measurement circuit with self-regulating function.
Background technology
In prior art, electronic thermometer is generally that the temperature of the thermistor being a specific electrical resistance (such as specified temp 37 DEG C, central resistance value is 30K) and value relatable are stored in internal storage by central resistance value.But the central resistance value of thermistor allows the error of 1% (29.7K to 30.3K) usually, and due to the nonlinear characteristic of thermistor itself, the thermistor of different central resistance value, its temperature curve is not identical, and the temperature curve that chip internal is preset is unique, thus cause the error of measurement.
Refer to shown in Fig. 1, it is the module diagram of traditional electric body-temperature metering circuit, and RS is thermistor, and RF is reference resistance.According to RC vibration theory, the waveform of thermometric counting module to reference resistance and thermistor counts respectively.Suppose, in identical Measuring Time, to count down to a certain fixed value N to reference resistance RF 37, N1 is count down to thermistor RS, then meets formula N 37× T rF=N1 × T rS.According to count results because this algorithm can oscillation-damped device constant k substantially oscimpact, be therefore proportional to resistance value oscillation period, according to the value of N1, in ROM look-up table, search corresponding temperature, exported by output module.Due to the normally specified temp 37 DEG C stored in ROM look-up table, central resistance value is the temperature curve of the thermistor of 30K, and external reference resistance normally 30K.Therefore 37 DEG C time, N1=N 37.But because the central resistance value error of thermistor is generally 1% (29.7K to 30.3K), its temperature curve of the thermistor of different central resistance value is not identical, thus result in the error of measurement.
Therefore roughly there are two kinds of Improving ways when production test:
One is when testing, completely according to the curve of the thermistor of reality, and the temperature curve of rewritting circuit inside;
Two is that utilize outside corrective system to choose suitable compensation combination, utilize and increase voltage, the modes such as current fusing retain selected parameter group at the built-in resistance of circuit and capacitance compensation network and switch control logic or built-in parameter list.
Rewrite temperature curve completely and need the debug time of at substantial aborning, the support utilizing outside corrective system to carry out parametric compensation then to need outside software and hardware, adds production cost.
Summary of the invention
The object of the invention is to overcome above-mentioned shortcoming of the prior art, provide a kind of can preset according to the central resistance value self-regulation of thermistor thermistor curve, better realize the different central resistance value of matching thermistor temperature curve, significantly reduce testing cost, obviously reduce measuring error, the electron temperature measurement circuit that simple and practical, stable and reliable working performance, the scope of application have self-regulating function comparatively widely.
In order to realize above-mentioned object, the electron temperature measurement circuit with self-regulating function of the present invention has following formation:
This has the electron temperature measurement circuit of self-regulating function, comprise thermistor, reference resistance, oscillatory circuit module, thermometric counting module, memory module and metrical information output module, described thermistor and reference resistance are all by described oscillatory circuit module, thermometric counting module, memory module is connected with described metrical information output module, its principal feature is, self-regulation module and test change-over switch is also comprised in described circuit structure, described oscillatory circuit module is connected with thermometric counting module with described self-regulation module respectively by described test change-over switch, and the output signal of described self-regulation module delivers to described memory module, the central resistance value of this self-regulation module according to described thermistor and the oscillation frequency of reference resistance, the temperature curve preset in described memory module is revised, and correction factor is preserved.
This self-regulation module had in the electron temperature measurement circuit of self-regulating function comprises:
Counting unit, is connected with described test change-over switch, for counting the central value of described thermistor and the waveform of reference resistance in same time;
Comparer, is connected with described counting unit, for comparing count results, obtains correction factor α;
Correction factor storage unit, is connected with described comparer, for storing correction factor α.
When this central resistance value error with the thermistor in the electron temperature measurement circuit of self-regulating function is ± 1%, the scope of described correction factor α is 0.99 ~ 1.01.
This has the duty of the test switching switch control circuit in the electron temperature measurement circuit of self-regulating function, when this test change-over switch is set to test pattern, the central value of described thermistor and the oscillation frequency of reference resistance deliver to described self-regulation module, produce correction factor α; When this test change-over switch is set to normal using forestland, described thermistor and the oscillation frequency of reference resistance deliver to described thermometric counting module, according to count results, and the correction factor α described in combining, in described memory module, find out correct corresponding temperature.
This oscillatory circuit module having in the electron temperature measurement circuit of self-regulating function is RC oscillator.
This memory module having in the electron temperature measurement circuit of self-regulating function is ROM storer.
Have employed the electron temperature measurement circuit with self-regulating function of this invention, because it does not need to rely on outside software and hardware, can according to the central resistance value of thermistor, the thermistor temp curve of self-regulation internal preset, and correction factor can be preserved, thus the temperature curve of the thermistor of the different central resistance value of better matching, while reduction testing cost, reduce measuring error, and simple and practical, stable and reliable working performance, the scope of application is comparatively extensive.
Accompanying drawing explanation
Fig. 1 is temperature measuring circuit high-level schematic functional block diagram of the prior art.
Fig. 2 is the electron temperature measurement circuit function module schematic diagram with self-regulating function of the present invention.
Fig. 3 is the internal functional elements schematic diagram of the self-regulation module had in the electron temperature measurement circuit of self-regulating function of the present invention.
Embodiment
In order to more clearly understand technology contents of the present invention, describe in detail especially exemplified by following examples.
Refer to shown in Fig. 2 and Fig. 3, this has the electron temperature measurement circuit of self-regulating function, comprise thermistor, reference resistance, oscillatory circuit module, thermometric counting module, memory module and metrical information output module, described thermistor and reference resistance are all by described oscillatory circuit module, thermometric counting module, memory module is connected with described metrical information output module, wherein, self-regulation module and test change-over switch is also comprised in described circuit structure, described oscillatory circuit module is connected with thermometric counting module with described self-regulation module respectively by described test change-over switch, and the output signal of described self-regulation module delivers to described memory module, the central resistance value of this self-regulation module according to described thermistor and the oscillation frequency of reference resistance, the temperature curve preset in described memory module is revised, and correction factor is preserved.
Wherein, described self-regulation module comprises:
(1) counting unit, is connected with described test change-over switch, for counting the central value of described thermistor and the waveform of reference resistance in same time;
(2) comparer, is connected with described counting unit, for comparing count results, obtains correction factor α;
(3) correction factor storage unit, is connected with described comparer, for storing correction factor α.
Meanwhile, when the central resistance value error of described thermistor is ± 1%, the scope of described correction factor α is 0.99 ~ 1.01; The duty of described test switching switch control circuit, when this test change-over switch is set to test pattern, the central value of described thermistor and the oscillation frequency of reference resistance deliver to described self-regulation module, produce correction factor α; When this test change-over switch is set to normal using forestland, described thermistor and the oscillation frequency of reference resistance deliver to described thermometric counting module, according to count results, and the correction factor α described in combining, in described memory module, find out correct corresponding temperature.
In the middle of reality uses, the self-regulation involved by thermometer measure circuit of the present invention is the production field for factory, is to solve the bad problem of thermistor consistance.And in test process, the temperature curve that chip internal is preset is revised, namely preserve, can not revise again.
The thermistor wherein related to, reference resistance is by RC oscillatory circuit, directly becomes clock signal, for rolling counters forward, meanwhile, the present invention is by the comparison to rolling counters forward result, obtain concrete corrected parameter, the standard temperature curve prestored is modified, and preserve in ROM.
What the resistance-temperature characteristics of general thermistor can be similar to shows with following formula table:
R = R 0 × e { B × [ 1 T - 1 T 0 ] } ;
Wherein: T (K)=t (DEG C)+273.15
Resistance when R0---temperature is T0
Resistance when R---temperature is T
In fact, thermistor constant B is not fixing, therefore in larger temperature range, uses formulae discovery resistance value, can there is larger error.Such as body temperature meter generally chooses 32 DEG C ~ 44 DEG C as surveying range, and the performance of this interval thermistor is close to linear.
The oscillation frequency of RC oscillator is: f = 1 k osc × R × C ;
Wherein oscillator constant is: k osc = ln [ ( V H V L ) × ( V DD - V L ) ( V DD - V H ) ] ;
In above formula, V h, V lfor Schmidt trigger transition high level and low level, V dDfor supply voltage.
Refer to shown in Fig. 2 be of the present invention can self-regulating electric body-temperature metering circuit.This circuit contains a self-regulation module and test change-over switch TEST.Work as TEST=1, circuit enters test pattern, and the central value of thermistor and the oscillation frequency of reference resistance enter self-regulation module, through process, obtains correction factor, and preserves.Work as TEST=0, circuit enters normal using forestland, and the oscillation frequency of thermistor and reference resistance then enters thermometric counting module, according to count results, and in conjunction with correction factor, finds out correct corresponding temperature in ROM.
Fig. 3 is a specific embodiment of the self-regulation module that electric body-temperature metering circuit of the present invention comprises, and can comprise counting module, comparer and correction factor storage unit.When the central value of thermistor and the oscillation frequency of reference resistance enter self-regulation module, counter counts oscillator signal respectively in same time, and at one time, the count value of the oscillator signal of thermistor central value is N2.By the N of N2 and standard in comparing unit 37compare, correction factor α, according to comparative result, is stored in correction factor storage unit, revises the temperature curve in circuit by control module.
When electric body-temperature metering circuit of the present invention normally works, suppose that the number of oscillation of thermistor waveform is N1, be so then modified to N1+N by this corrected parameter 37(1-a).When the central value of thermistor is higher than reference resistance, according to RC vibration, the oscillation frequency of thermistor lower than the oscillation frequency of reference resistance, N2 < N 37, correction factor a < 1.When the central value of thermistor is lower than reference resistance, according to RC vibration, the oscillation frequency of thermistor higher than the oscillation frequency of reference resistance, N2 > N 37, correction factor a > 1.When the central value of thermistor equals reference resistance, N2=N 37, correction factor a=1.When the central resistance value error of thermistor is generally 1% (29.7K to 30.3K), the scope of correction factor a is 0.99 ~ 1.01.
Of the present invention can self-regulating thermometer measure circuit, wherein contain a self-regulation module and test change-over switch TEST.
This can in self-regulating thermometer measure circuit, and described test change-over switch TEST can the duty of control circuit.As test change-over switch TEST=1, circuit enters test pattern, and the central value of thermistor and the oscillation frequency of reference resistance enter self-regulation module, produces correction factor α.As test TEST=0, circuit enters normal using forestland, and the oscillation frequency of thermistor and reference resistance then enters thermometric counting module, according to count results, and in conjunction with correction factor α, finds out correct corresponding temperature in ROM.
This self-regulation module can comprise in self-regulating thermometer measure circuit:
Counting module, for counting the central value of thermistor and the waveform of reference resistance in same time;
Comparer, for count results being compared, obtains correction factor α;
Correction factor storage unit, for storing correction factor α.
Have employed the above-mentioned electron temperature measurement circuit with self-regulating function, because it does not need to rely on outside software and hardware, can according to the central resistance value of thermistor, the thermistor temp curve of self-regulation internal preset, and correction factor can be preserved, thus the temperature curve of the thermistor of the different central resistance value of better matching, while reduction testing cost, reduce measuring error, and simple and practical, stable and reliable working performance, the scope of application is comparatively extensive.
In this description, the present invention is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, instructions and accompanying drawing are regarded in an illustrative, rather than a restrictive.

Claims (5)

1. one kind has the electron temperature measurement circuit of self-regulating function, comprise thermistor, reference resistance, oscillatory circuit module, thermometric counting module, memory module and metrical information output module, described thermistor and reference resistance are connected described oscillatory circuit module respectively, described oscillatory circuit module connects described thermometric counting module successively, described memory module and described metrical information output module, it is characterized in that, self-regulation module and test change-over switch is also comprised in described temperature measuring circuit structure, described oscillatory circuit module is connected with thermometric counting module with described self-regulation module respectively by described test change-over switch, and the output signal of described self-regulation module delivers to described memory module, the count value of oscillation frequency of this self-regulation module according to described thermistor central resistance value and the count value of the oscillation frequency of reference resistance, the temperature curve preset in described memory module is revised, and correction factor is preserved,
Wherein, the duty of described test change-over switch control temperature metering circuit, when this test change-over switch is set to test pattern, the central resistance value of described thermistor and the oscillation frequency of reference resistance deliver to described self-regulation module, the count value of oscillation frequency of described thermistor central resistance value and the count value of the oscillation frequency of reference resistance compare by described self-regulation module, produce correction factor α; When this test change-over switch is set to normal using forestland, described thermistor and the oscillation frequency of reference resistance deliver to described thermometric counting module, according to count results, and the correction factor α described in combining, in described memory module, find out correct corresponding temperature.
2. the electron temperature measurement circuit with self-regulating function according to claim 1, is characterized in that, described self-regulation module comprises:
Counting unit, is connected with described test change-over switch, for counting the described oscillation frequency of thermistor central resistance value and the oscillation frequency of reference resistance in same time;
Comparer, is connected with described counting unit, for comparing count results, obtains correction factor α;
Correction factor storage unit, is connected with described comparer, for storing correction factor α.
3. the electron temperature measurement circuit with self-regulating function according to claim 2, is characterized in that, when the central resistance value error of described thermistor is ± 1%, the scope of described correction factor α is 0.99 ~ 1.01.
4. the electron temperature measurement circuit with self-regulating function according to any one of claim 1 to 3, is characterized in that, described oscillatory circuit module is RC oscillator.
5. the electron temperature measurement circuit with self-regulating function according to any one of claim 1 to 3, is characterized in that, described memory module is ROM storer.
CN201110434184.9A 2011-12-21 2011-12-21 Electron temperature measuring circuit with self-regulating function Active CN103175633B (en)

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CN107884096B (en) * 2017-11-09 2019-12-10 无锡华润矽科微电子有限公司 automatic calibration method and device for electronic temperature measurement equipment with micro control unit
CN112729590A (en) * 2020-12-25 2021-04-30 中国科学院微电子研究所 Temperature sensor reading device, temperature reading method, and electronic apparatus
CN114689199B (en) * 2020-12-29 2023-06-02 华润微集成电路(无锡)有限公司 Predictive electronic thermometer circuit structure for realizing temperature compensation
CN113532680A (en) * 2021-06-03 2021-10-22 上海润欣科技股份有限公司 Thermometer chip and thermometer

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Publication number Priority date Publication date Assignee Title
CN101398334A (en) * 2007-09-29 2009-04-01 联兴微***科技股份有限公司 Temperature-sensing element correcting method and correcting system
CN202075060U (en) * 2011-05-19 2011-12-14 樱花卫厨（中国）股份有限公司 Temperature measuring device of numerical control sterilizing cabinet
CN202442811U (en) * 2011-12-21 2012-09-19 无锡华润矽科微电子有限公司 Structure of electronic temperature measurement circuit

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JP5378028B2 (en) * 2009-03-27 2013-12-25 テルモ株式会社 Electronic thermometer and operation control method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101398334A (en) * 2007-09-29 2009-04-01 联兴微***科技股份有限公司 Temperature-sensing element correcting method and correcting system
CN202075060U (en) * 2011-05-19 2011-12-14 樱花卫厨（中国）股份有限公司 Temperature measuring device of numerical control sterilizing cabinet
CN202442811U (en) * 2011-12-21 2012-09-19 无锡华润矽科微电子有限公司 Structure of electronic temperature measurement circuit

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Address after: 214135 -6, Linghu Avenue, Wuxi Taihu international science and Technology Park, Wuxi, Jiangsu, China, 180

Patentee after: China Resources micro integrated circuit (Wuxi) Co., Ltd

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