CN204758156U - Accurate temperature detection circuit of platinum resistance - Google Patents
Accurate temperature detection circuit of platinum resistance Download PDFInfo
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- CN204758156U CN204758156U CN201520474426.0U CN201520474426U CN204758156U CN 204758156 U CN204758156 U CN 204758156U CN 201520474426 U CN201520474426 U CN 201520474426U CN 204758156 U CN204758156 U CN 204758156U
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Abstract
The utility model relates to an accurate temperature detection circuit of platinum resistance, its characterized in that: including constant voltage source, current -limiting resistor, platinum resistance and accurate resistance, wherein the output of constant voltage source is connected with current -limiting resistor's first end, and current -limiting resistor's second is held and is connected with the first end of platinum resistance, and the second of platinum resistance is held and is connected with the first end of accurate resistance, the second termination ground of accurate resistance, connect four lead wires, first root lead wire is connected with the first end of platinum resistance, second root lead wire is connected with the second end of platinum resistance, and third root lead wire is connected with the first end of accurate resistance, fourth root lead wire is connected with the second end of accurate resistance, measure the platinum resistive voltage divider between first root lead wire and the second root lead wire, measure the accurate resistive voltage divider between third root lead wire and the fourth root lead wire, the resistance value of platinum resistance is calculated through accurate resistive voltage divider, platinum resistive voltage divider and accurate resistance, the corresponding relation of the resistance value through the platinum resistance and temperature value at last calculates or tables look -up and obtains platinum resistance measurement's temperature value.
Description
Technical field
The utility model relates to a kind of platinum resistance precise temperature measurement circuit.
Background technology
Platinum resistance temperature sensor is the temperature sensor utilizing its resistance to become certain funtcional relationship with temperature and make, because its accuracy of measurement is high, large, the repdocutbility of measurement range and good stability etc., be widely used in the temperature survey of middle temperature (-200 DEG C ~ 650 DEG C) scope.
Its circuit structure of existing Pt Resistance Temperature Measuring Circuit is comparatively complicated, and cost is higher, and precision is not high, breakdown judge difficulty.
Utility model content
Technical problem to be solved in the utility model be for above-mentioned prior art provide a kind of simple, reliable, stable, cost is low, precision is high and can judge the platinum resistance precise temperature measurement circuit of platinum resistance and lead wire fault.
The utility model solves the problems of the technologies described above adopted technical scheme: a kind of platinum resistance precise temperature measurement circuit, it is characterized in that: comprise constant pressure source, current-limiting resistance, platinum resistance and precision resistance, wherein the output terminal of constant pressure source is connected with the first end of current-limiting resistance, second end of current-limiting resistance is connected with the first end of platinum resistance, second end of platinum resistance is connected with the first end of precision resistance, the second end ground connection of precision resistance; Connect four lead-in wires, first lead-in wire is connected with the first end of platinum resistance; Second lead-in wire is connected with the second end of platinum resistance, and the 3rd lead-in wire is connected with the first end of precision resistance; 4th lead-in wire is connected with the second end of precision resistance; Then measure the platinum resistance dividing potential drop between first lead-in wire and second lead-in wire, measure the precision resistance dividing potential drop between the 3rd lead-in wire and the 4th lead-in wire; By the resistance value of precision resistance dividing potential drop, platinum resistance dividing potential drop and precision resistance computing the resistor value platinum resistance; Finally by the resistance value of platinum resistance and the corresponding relation of temperature value, calculate or table look-up obtain platinum resistance measure temperature value.
If platinum resistance maximum value is 1000 ohm, described precision resistance also chooses 1000 ohm.
Preferably, the resistance of current-limiting resistance is chosen as 5 ~ 10 times of platinum resistance maximum value.
Compared with prior art, the utility model has the advantage of: this circuit is simple, reliable, stable, cost is low, and the resistance value precision of platinum resistance depends on the precision of voltage measurement accuracy and precision resistance, and therefore precision is higher.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of platinum resistance precise temperature measurement circuit in the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing embodiment, the utility model is described in further detail.
Platinum resistance precise temperature measurement circuit as shown in Figure 1, it comprises constant pressure source VE, current-limiting resistance R1, platinum resistance Pt and precision resistance R2, wherein the output terminal of constant pressure source VE is connected with the first end of current-limiting resistance R1, second end of current-limiting resistance R1 is connected with the first end of platinum resistance Pt, second end of platinum resistance Pt is connected with the first end of precision resistance R2, the second end ground connection of precision resistance R2; Connect four lead-in wires, first lead-in wire is connected with the first end of platinum resistance; Second lead-in wire is connected with the second end of platinum resistance, and the 3rd lead-in wire is connected with the first end of precision resistance; 4th lead-in wire is connected with the second end of precision resistance; Then the platinum resistance dividing potential drop V between first lead-in wire and second lead-in wire is measured
rt, measure the precision resistance dividing potential drop V between the 3rd lead-in wire and the 4th lead-in wire
r2; Resistance value by precision resistance dividing potential drop, platinum resistance dividing potential drop and precision resistance computing the resistor value platinum resistance:
finally by the resistance value of platinum resistance and the corresponding relation of temperature value, calculate or table look-up obtain platinum resistance measure temperature value.
The selection of current-limiting resistance will ensure that the electric current I t flowing through platinum resistance Pt is enough little, thus produces heat effects measuring accuracy when ensureing that electric current I t can not make it flow through platinum resistance Pt, also will ensure V simultaneously
ptenough large, to meet the requirement of Measurement Resolution; For Pt1000, the resistance of current-limiting resistance R1 be 5000 ohm ~ 10000 ohm comparatively suitable, and precision resistance also choose 1000 ohm comparatively suitable.
If platinum resistance dividing potential drop V
rtwith precision resistance dividing potential drop V
r2measure with A/D conversion regime, then the reference source of A/D conversion element can use VE dividing potential drop, to save expensive accurate fiducial chip; This circuit has breakdown judge function simultaneously, as the V recorded
rtand V
r2all close to zero, then the lead-in wire open circuit between platinum resistance and current-limiting resistance R1 is described, or the lead-in wire open circuit between platinum resistance and precision resistance R2; As the V recorded
rtvalue is close to zero, and V
r2normally, then the lead-in wire open circuit between platinum resistance and terminals C2 is described, or the lead-in wire open circuit between platinum resistance and terminals C3; As the V measured
rtthe maximum upper limit of value for measuring, then platinum resistance internal break is described; As the V recorded
rtvalue is zero, and V
r2for the maximum upper limit measured, then platinum resistance internal short-circuit is described.
Claims (3)
1. a platinum resistance precise temperature measurement circuit, it is characterized in that: comprise constant pressure source, current-limiting resistance, platinum resistance and precision resistance, wherein the output terminal of constant pressure source is connected with the first end of current-limiting resistance, second end of current-limiting resistance is connected with the first end of platinum resistance, second end of platinum resistance is connected with the first end of precision resistance, the second end ground connection of precision resistance; Connect four lead-in wires, first lead-in wire is connected with the first end of platinum resistance; Second lead-in wire is connected with the second end of platinum resistance, and the 3rd lead-in wire is connected with the first end of precision resistance; 4th lead-in wire is connected with the second end of precision resistance; Then measure the platinum resistance dividing potential drop between first lead-in wire and second lead-in wire, measure the precision resistance dividing potential drop between the 3rd lead-in wire and the 4th lead-in wire; By the resistance value of precision resistance dividing potential drop, platinum resistance dividing potential drop and precision resistance computing the resistor value platinum resistance; Finally by the resistance value of platinum resistance and the corresponding relation of temperature value, calculate or table look-up obtain platinum resistance measure temperature value.
2. platinum resistance precise temperature measurement circuit according to claim 1, is characterized in that: when described platinum resistance maximum value is 1000 ohm, described precision resistance also chooses 1000 ohm.
3. platinum resistance precise temperature measurement circuit according to claim 1, is characterized in that: the resistance of current-limiting resistance is chosen as 5 ~ 10 times of platinum resistance maximum value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520474426.0U CN204758156U (en) | 2015-06-30 | 2015-06-30 | Accurate temperature detection circuit of platinum resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520474426.0U CN204758156U (en) | 2015-06-30 | 2015-06-30 | Accurate temperature detection circuit of platinum resistance |
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| Publication Number | Publication Date |
|---|---|
| CN204758156U true CN204758156U (en) | 2015-11-11 |
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ID=54472855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520474426.0U Active CN204758156U (en) | 2015-06-30 | 2015-06-30 | Accurate temperature detection circuit of platinum resistance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106885640A (en) * | 2017-03-30 | 2017-06-23 | 苏州汇川联合动力系统有限公司 | A kind of motor temperature sample circuit |
| CN110220606A (en) * | 2019-06-24 | 2019-09-10 | 宁波华仪宁创智能科技有限公司 | Temperature measuring equipment and method with calibration function |
-
2015
- 2015-06-30 CN CN201520474426.0U patent/CN204758156U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106885640A (en) * | 2017-03-30 | 2017-06-23 | 苏州汇川联合动力系统有限公司 | A kind of motor temperature sample circuit |
| CN110220606A (en) * | 2019-06-24 | 2019-09-10 | 宁波华仪宁创智能科技有限公司 | Temperature measuring equipment and method with calibration function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200827 Address after: 315181 Lin village, Haishu District, Ningbo, Zhejiang Patentee after: NINGBO DONGHAI Group Corp. Address before: 315181, Zhejiang, Ningbo province Yinzhou District Heng Lin Village Patentee before: NINGBO DONGHAI INSTRUMENT WATERWAY Co.,Ltd. |
|
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: NINGBO DONGHAI INSTRUMENT WATERWAY Co.,Ltd. Assignor: NINGBO DONGHAI Group Corp. Contract record no.: X2021330000081 Denomination of utility model: Platinum resistance precision temperature measuring circuit Granted publication date: 20151111 License type: Exclusive License Record date: 20210819 |