CN103196581A - Device using multiple groups of digital potentiometers to simulate Pt 1000 platinum resistor and method of device simulating Pt 1000 platinum resistor - Google Patents
Device using multiple groups of digital potentiometers to simulate Pt 1000 platinum resistor and method of device simulating Pt 1000 platinum resistor Download PDFInfo
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- CN103196581A CN103196581A CN2013101132126A CN201310113212A CN103196581A CN 103196581 A CN103196581 A CN 103196581A CN 2013101132126 A CN2013101132126 A CN 2013101132126A CN 201310113212 A CN201310113212 A CN 201310113212A CN 103196581 A CN103196581 A CN 103196581A
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Abstract
The invention provides a device using multiple groups of digital potentiometers to simulate a Pt 1000 platinum resistor and a method of the device simulating the Pt 1000 platinum resistor, and relates to the technical field of electronics. The device using the multiple groups of digital potentiometers to simulate the Pt 1000 platinum resistor and the method of the device simulating the Pt 1000 platinum resistor aim to solve the problems that a circuit is complex, size is large, a resolution ratio of the digital potentiometers is not high, and a requirement for accuracy cannot be met. According to the device using the multiple groups of digital potentiometers to simulate the Pt 1000 platinum resistor, a current temperature value is set through a key input module; according to a platinum resistor reference table, the numbers of taps needed by each digital potentiometer at different temperatures are calculated through a temperature calculation module; and a single chip microcomputer controls the circuit to send control signals to a first digital potentiometer, a second digital potentiometer and a third digital potentiometer respectively according to the numbers of taps of each digital potentiometer, adjusting of resistance values of the first digital potentiometer, resistance values of the second digital potentiometer and resistance values of the third digital potentiometer is achieved, and then resistance values between a first node and a second node is adjusted. The device using the multiple groups of digital potentiometers to simulate the Pt 1000 platinum resistor and the method of the device simulating the Pt 1000 platinum resistor are suitable for being applied to the existing technical field of electronics.
Description
Technical field
The present invention relates to electronic technology field, particularly the analogue technique of Pt100 platinum resistance.
Background technology
Platinum resistance is the temperature variant thermal resistance of a kind of resistance meeting, and the normal method of combined resistance that adopts replaces platinum resistance in test and debugging.Combined resistance has following several method at present:
1. switch precision resistance by relay and obtain variable resistance.This method volume is big and because relay exists contact resistance to make that precision is difficult to guarantee.
2. constitute one-port network by the ratio of programming Control input electricity and input current with operational amplifier and digital to analog converter etc., thereby obtain combined resistance able to programme.But this method has certain limitation, and resistance variations is limited in scope, and measures complicated.
3. adopt the individual digit potentiometer to obtain variable resistance by switching semiconductor resistor.Can only not accomplish 256 taps at most but the resolution of present digital regulation resistance is high in the scope of 1k Ω, precision can not meet the demands.
Summary of the invention
The present invention is in order to solve in the process of simulation Pt100 platinum resistance, the circuit complexity, volume is big, the resolution of digital regulation resistance is not high, the problem that precision can not meet the demands, and then provide with the device of many group digital regulation resistance simulation Pt100 platinum resistance and the method for this device simulation Pt100 platinum resistance.
Usefulness of the present invention is organized the device of digital regulation resistance simulation Pt100 platinum resistance more, and it comprises keyboard input module, temperature computation module, single chip machine controlling circuit, first digital regulation resistance, second digital regulation resistance, the 3rd digital regulation resistance, first fixed resistance, second fixed resistance, the 3rd fixed resistance, first node and Section Point;
The output terminal of keyboard input module connects the input end of temperature computation module, the output terminal of temperature computation module connects the input end of single chip machine controlling circuit, three control signal output terminals of single chip machine controlling circuit connect the adjustment end of first digital regulation resistance respectively, the adjustment end of second digital regulation resistance and the adjustment end of the 3rd digital regulation resistance, resistance output terminal of first digital regulation resistance and an end of first fixed resistance are connected in first node, another resistance output terminal of first digital regulation resistance connects resistance output terminal of second digital regulation resistance and the other end of first fixed resistance simultaneously, one end of second fixed resistance, another resistance output terminal of second digital regulation resistance connects resistance output terminal of the 3rd digital regulation resistance and the other end of second fixed resistance simultaneously, one end of the 3rd fixed resistance, another resistance output terminal of the 3rd digital regulation resistance and the other end of the 3rd fixed resistance are connected in Section Point
Described first node and Section Point are two output terminals of the Pt100 platinum resistance of simulation.
With the method for the device simulation Pt100 platinum resistance of many groups digital regulation resistance simulation Pt100 platinum resistance,
Step 1, by keyboard input module current temperature value is set;
The present invention can accurately simulate platinum resistance, and resolution is 1 ℃, and the gained resistance error can reach below 0.1%.And circuit is simple, is easy to realize, has overcome the bulky characteristics of relay simulation platinum resistance, and on having solved with the not high basis of individual digit potentiometer precision, is easier to measure than the method with operational amplifier and digital to analog converter again.
Description of drawings
Fig. 1 is one-piece construction synoptic diagram of the present invention.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, the described usefulness of present embodiment is organized the device of digital regulation resistance simulation Pt100 platinum resistance more, and it comprises keyboard input module 1, temperature computation module 2, single chip machine controlling circuit 3, first digital regulation resistance 4, second digital regulation resistance 5, the 3rd digital regulation resistance 6, the first fixed resistance R1, the second fixed resistance R2, the 3rd fixed resistance R3, first node 7 and Section Point 8;
The output terminal of keyboard input module 1 connects the input end of temperature computation module 2, the output terminal of temperature computation module 2 connects the input end of single chip machine controlling circuit 3, three control signal output terminals of single chip machine controlling circuit 3 connect the adjustment end of first digital regulation resistance 4 respectively, the adjustment end of the adjustment end of second digital regulation resistance 5 and the 3rd digital regulation resistance 6, resistance output terminal of first digital regulation resistance 4 and the end of the first fixed resistance R1 are connected in first node 7, another resistance output terminal of first digital regulation resistance 4 connects resistance output terminal of second digital regulation resistance 5 and the other end of the first fixed resistance R1 simultaneously, the end of the second fixed resistance R2, another resistance output terminal of second digital regulation resistance 5 connects resistance output terminal of the 3rd digital regulation resistance 6 and the other end of the second fixed resistance R2 simultaneously, the end of the 3rd fixed resistance R3, another resistance output terminal of the 3rd digital regulation resistance 6 and the other end of the 3rd fixed resistance R3 are connected in Section Point 8
Described first node 7 and Section Point 8 are two output terminals of the Pt100 platinum resistance of simulation.
Embodiment two: present embodiment is organized the further restriction of the device of digital regulation resistance simulation Pt100 platinum resistance more to embodiment one described usefulness, in the present embodiment, described first digital regulation resistance, 4, the second digital regulation resistances 5 and the 3rd digital regulation resistance 6 all are that 256 taps and maximum value are the digital regulation resistance of 1k Ω; The fixed resistance value of the first fixed resistance R1 is 300 Ω, and the fixed resistance value of the second fixed resistance R2 is 80 Ω, fixed resistance value 20 Ω of the 3rd fixed resistance R3.
Embodiment three: in conjunction with Fig. 1 present embodiment is described, present embodiment is to adopt the described usefulness of embodiment one to two any one embodiment to organize the method for the device simulation Pt100 platinum resistance of digital regulation resistance simulation Pt100 platinum resistance more,
Step 1, by keyboard input module 1 current temperature value is set;
Embodiment four: present embodiment is further specifying embodiment three, the described usefulness of present embodiment is organized the method for the device simulation Pt100 platinum resistance of digital regulation resistance simulation Pt100 platinum resistance more, the described branch kilsyth basalt according to platinum resistance of step 2 by temperature computation module 2 each digital regulation resistance of calculating in the detailed process of the corresponding tap number of described temperature value is:
Look into the branch kilsyth basalt of Pt100 platinum resistance according to the temperature value that arranges, obtain corresponding scale division value, platinum resistance namely the to be simulated resistance under relevant temperature; Temperature computation module 2 is calculated resistance and the corresponding tap number that obtains first digital regulation resistance 4, second digital regulation resistance 5 and the 3rd digital regulation resistance 6 according to the resistance of this resistance and the first fixed resistance R1, the resistance of the second fixed resistance R2 and the resistance of the 3rd fixed resistance R3.
Said process can adopt following method to realize: at first calculate each digital regulation resistance under each tap with resistance value after its parallel resistor is in parallel, each potentiometer obtains the corresponding array that contains 256 resistance values, adopt the mode of permutation and combination, from the array of three potentiometer correspondences, select a resistance value as one group of data respectively, with three resistance value addition acquisition and the resistance of this group in data, select and the resistance of platinum resistance under relevant temperature to be simulated immediate one and the corresponding one group of data of resistance, this is organized the tap number of three potentiometers of three resistance value correspondences in data as the tap number of correspondence.
In the present embodiment, needed tap number is as follows under different temperatures:
For example:
When the tap of first digital regulation resistance 4 is respectively 1,2, to should potentiometer with the first fixed resistance R1 parallel connection after corresponding resistance value be respectively: 0 Ω, 1 Ω;
When the tap of second digital regulation resistance 5 is respectively 3,4, to should potentiometer with the second fixed resistance R2 parallel connection after corresponding resistance value be respectively: 2 Ω, 3 Ω;
When the tap of the 3rd digital regulation resistance 6 is respectively 5,6, to should potentiometer with the 3rd fixed resistance R3 parallel connection after corresponding resistance value be respectively: 4 Ω, 5 Ω.
List the first node 7 of selected above-mentioned situation correspondence and all combinations of the resistance value between the Section Point 8:
0 Ω, 2 Ω, 4 Ω, the resistance value between corresponding first node 7 and the Section Point 8 is 6 Ω;
0 Ω, 2 Ω, 5 Ω, the resistance value between corresponding first node 7 and the Section Point 8 is 7 Ω;
0 Ω, 3 Ω, 4 Ω, the resistance value between corresponding first node 7 and the Section Point 8 is 7 Ω;
0 Ω, 3 Ω, 5 Ω, the resistance value between corresponding first node 7 and the Section Point 8 is 8 Ω;
1 Ω, 2 Ω, 4 Ω, the resistance value between corresponding first node 7 and the Section Point 8 is 7 Ω;
1 Ω, 2 Ω, 5 Ω, the resistance value between corresponding first node 7 and the Section Point 8 is 8 Ω;
1 Ω, 3 Ω, 4 Ω, the resistance value between corresponding first node 7 and the Section Point 8 is 8 Ω;
1 Ω, 3 Ω, 5 Ω, the resistance value between corresponding first node 7 and the Section Point 8 is 9 Ω;
If platinum resistance to be simulated resistance 7 Ω under relevant temperature, extracting a class value out so from all combinations of the corresponding array of selected three groups of potentiometers is 0 Ω, 2 Ω, 5 Ω; The tap number that obtains each potentiometer correspondence is 1,3, and 6.
In sum, the resistance 1k Ω of Pt100 when obtaining 0 ℃, the resistance of the first fixed resistance R1 is 300 Ω, the resistance of the second fixed resistance R2 is 80 Ω, the resistance of the 3rd fixed resistance R3 is 20 Ω, first digital regulation resistance, 4, the second digital regulation resistances 5 and the 3rd digital regulation resistance 6 all are that 256 taps and maximum value are the digital regulation resistance of 1k Ω, and the process according to the result who obtains according to minute kilsyth basalt and digital regulation resistance calculation of parameter is so:
Regulate the tap to 3 of first digital regulation resistance 4, obtain resistance 42.96 Ω in parallel, regulate the tap to 11 of second digital regulation resistance 5, obtain resistance 41.5 Ω in parallel, regulate the tap to 7 of the 3rd digital regulation resistance 6, obtain resistance 15.54 Ω in parallel, the resistance after the series connection is 42.96 Ω+41.5 Ω+15.54 Ω=100 Ω so, is the theoretical value of Pt100 platinum resistance 0 ℃ the time.
According to the branch kilsyth basalt adjustment digital regulation resistance model of different thermal resistances or the resistance of institute's parallel precise resistance, can reach the function of the multiple thermal resistance of simulation.
Claims (4)
1. with the device of many group digital regulation resistance simulation Pt100 platinum resistance, it is characterized in that: it comprises keyboard input module (1), temperature computation module (2), single chip machine controlling circuit (3), first digital regulation resistance (4), second digital regulation resistance (5), the 3rd digital regulation resistance (6), first fixed resistance (R1), second fixed resistance (R2), the 3rd fixed resistance (R3), first node (7) and Section Point (8);
The output terminal of keyboard input module (1) connects the input end of temperature computation module (2), the output terminal of temperature computation module (2) connects the input end of single chip machine controlling circuit (3), three control signal output terminals of single chip machine controlling circuit (3) connect the adjustment end of first digital regulation resistance (4) respectively, the adjustment end of the adjustment end of second digital regulation resistance (5) and the 3rd digital regulation resistance (6), resistance output terminal of first digital regulation resistance (4) and an end of first fixed resistance (R1) are connected in first node (7), another resistance output terminal of first digital regulation resistance (4) connects resistance output terminal of second digital regulation resistance (5) and the other end of first fixed resistance (R1) simultaneously, one end of second fixed resistance (R2), another resistance output terminal of second digital regulation resistance (5) connects resistance output terminal of the 3rd digital regulation resistance (6) and the other end of second fixed resistance (R2) simultaneously, one end of the 3rd fixed resistance (R3), another resistance output terminal of the 3rd digital regulation resistance (6) and the other end of the 3rd fixed resistance (R3) are connected in Section Point (8)
Described first node (7) and Section Point (8) are two output terminals of the Pt100 platinum resistance of simulation.
2. usefulness according to claim 1 is organized the device of digital regulation resistance simulation Pt100 platinum resistance more, it is characterized in that: first digital regulation resistance (4), second digital regulation resistance (5) and the 3rd digital regulation resistance (6) all are that 256 taps and maximum value are the digital regulation resistance of 1k Ω; The fixed resistance value of first fixed resistance (R1) is 300 Ω, and the fixed resistance value of second fixed resistance (R2) is 80 Ω, fixed resistance value 20 Ω of the 3rd fixed resistance (R3).
3. adopt the described usefulness of claim 1 to organize the method for the device simulation Pt100 platinum resistance of digital regulation resistance simulation Pt100 platinum resistance more, it is characterized in that::
Step 1, by keyboard input module (1) current temperature value is set;
Step 2, according to the branch kilsyth basalt of Pt100 platinum resistance, calculate each digital regulation resistance in the corresponding tap number of described temperature value by temperature computation module (2);
Step 3, single chip machine controlling circuit send control signal respectively to first digital regulation resistance (4) according to the tap number of each digital regulation resistance that step 2 obtains, second digital regulation resistance (5) and the 3rd digital regulation resistance (6), realize adjusting first digital regulation resistance (4), the resistance of second digital regulation resistance (5) and the 3rd digital regulation resistance (6), and then the resistance value between adjustment first node (7) and the Section Point (8), be that this resistance is the resistance of the corresponding Pt100 platinum resistance of temperature value of step 1 setting.
4. organize the method for the device simulation Pt100 platinum resistance of digital regulation resistance simulation Pt100 platinum resistance according to the described usefulness of claim 3 more, it is characterized in that: the described branch kilsyth basalt according to platinum resistance of step 2, calculate each digital regulation resistance by temperature computation module (2) and in the detailed process of the corresponding tap number of described temperature value be:
Look into the branch kilsyth basalt of Pt100 platinum resistance according to the temperature value that arranges, obtain corresponding scale division value, platinum resistance namely the to be simulated resistance under relevant temperature; Temperature computation module (2) is calculated resistance and the corresponding tap number that obtains first digital regulation resistance (4), second digital regulation resistance (5) and the 3rd digital regulation resistance (6) according to the resistance of this resistance and first fixed resistance (R1), the resistance of second fixed resistance (R2) and the resistance of the 3rd fixed resistance (R3).
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| CN2013101132126A CN103196581A (en) | 2013-04-02 | 2013-04-02 | Device using multiple groups of digital potentiometers to simulate Pt 1000 platinum resistor and method of device simulating Pt 1000 platinum resistor |
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| CN2013101132126A CN103196581A (en) | 2013-04-02 | 2013-04-02 | Device using multiple groups of digital potentiometers to simulate Pt 1000 platinum resistor and method of device simulating Pt 1000 platinum resistor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833876A (en) * | 2015-04-29 | 2015-08-12 | 常州大学 | Battery charger temperature compensation analog device |
| CN107453747A (en) * | 2017-07-27 | 2017-12-08 | 宁波大学 | The method that single-chip microcomputer with a/d converter realizes multiway analog switch with potentiometer |
Citations (2)
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| CN101666690A (en) * | 2009-09-08 | 2010-03-10 | 深圳和而泰智能控制股份有限公司 | Method and device for simulating NTC sensor parameters |
| CN202599568U (en) * | 2012-06-19 | 2012-12-12 | 北京康拓科技有限公司 | Output resistor suitable for platinum resistance thermometer sensor analog board |
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2013
- 2013-04-02 CN CN2013101132126A patent/CN103196581A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666690A (en) * | 2009-09-08 | 2010-03-10 | 深圳和而泰智能控制股份有限公司 | Method and device for simulating NTC sensor parameters |
| CN202599568U (en) * | 2012-06-19 | 2012-12-12 | 北京康拓科技有限公司 | Output resistor suitable for platinum resistance thermometer sensor analog board |
Non-Patent Citations (1)
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| 张丽荣: "数字电位器的优化设计及应用研究", 《中国学位论文全文数据库》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833876A (en) * | 2015-04-29 | 2015-08-12 | 常州大学 | Battery charger temperature compensation analog device |
| CN107453747A (en) * | 2017-07-27 | 2017-12-08 | 宁波大学 | The method that single-chip microcomputer with a/d converter realizes multiway analog switch with potentiometer |
| CN107453747B (en) * | 2017-07-27 | 2020-11-03 | 宁波大学 | Method for realizing multi-path analog switch by potentiometer for single chip microcomputer with AD converter |
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Application publication date: 20130710 |