CN201955169U - Interface circuit of temperature sensor - Google Patents
Interface circuit of temperature sensor Download PDFInfo
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- CN201955169U CN201955169U CN2010206410079U CN201020641007U CN201955169U CN 201955169 U CN201955169 U CN 201955169U CN 2010206410079 U CN2010206410079 U CN 2010206410079U CN 201020641007 U CN201020641007 U CN 201020641007U CN 201955169 U CN201955169 U CN 201955169U
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Abstract
The utility model discloses an interface circuit of a temperature sensor, comprising a thermistor voltage stabilization drive source circuit and a thermistor interface circuit. The thermistor voltage stabilization drive source circuit adopts a voltage stabilization chip LM4040 of TI (Texas Instruments) Company, and the precision of voltage stabilization can reach 0.1 percent, thereby providing a high-precision reference voltage to a thermistor XS1. The thermistor XS1 has a negative temperature coefficient, and the temperature measurement rang of the thermistor XS1 can range from minus 40 DEG C to 125 DEG C. A voltage follower LMV 324 is adopted as an operational amplifier of the thermistor interface circuit, so that the quality is good, and the cost is low.
Description
Technical field
The utility model relates to the leading portion that a kind of AD of being used for gathers, and exports precise and stable voltage signal, does the temperature sensor interface circuit of real-time temperature acquisition for the AD acquisition chip.
Background technology
Sensing circuit is forefront one ring that obtains in the TT﹠C system in the information process, what obtain from it is the measured firsthand information, is similar to human sense organ, so its performance is done following requirement, to satisfy the needs of test: 1, sensitivity is done, and the linearity is good.2, it is little to lag behind, drift about.3, the repdocutbility of characteristic is good, has interchangeability.4, dynamic property is good.5, little to the influence of measurand, promptly load effect is low.
Current monitoring temperature circuit adopts thermopair more, and Pt100 etc. are as temperature sensor, and amplifier also adopts high-operational amplifiers more, the cost height, and volume is big, installs inconvenient.
Therefore wishing to have a kind of circuit to reduce cost, and reduces volume, in real time the circuit arrangement of collecting temperature.
The utility model content:
This practical technical matters to be solved is to provide at the existing existing deficiency of monitoring temperature circuit a kind of requirement that can satisfied temperature sensor technology aspect, and has and reduce cost, and reduces the temperature sensor interface circuit of advantage such as volume.
Technical problem to be solved in the utility model can be achieved through the following technical solutions:
A kind of temperature sensor interface circuit, comprise thermistor voltage stabilizing drive source circuit and and the thermistor interface circuit;
Described thermistor voltage stabilizing drive source circuit comprises voltage stabilizing chip B1, single power supply amplifier U1, first resistance R 1, second resistance R 2, the 3rd resistance R 3, electrochemical capacitor C1, first capacitor C 2, voltage stabilizing chip B1 is LM4040, and single power supply amplifier U1 is LMV934; The voltage stabilizing chip B1 and first resistance R 1 are connected into a bleeder circuit, the AD_RIN pin of positive termination 12 bit A/D converters of voltage stabilizing chip B1, the negative terminal of voltage stabilizing chip B1 is connected with first resistance R 1, the other end of first resistance R 1 is imported an operating voltage VCC, the anode of electrochemical capacitor C1 inserts the input anode of single power supply amplifier U1 together with the common port of the voltage stabilizing chip B1 and first resistance R 1 and exports the reference voltage 4V096 of temperature-sensitive resistance interface circuit, and the negative terminal of electrochemical capacitor C1 connects the AD_RIN pin of 12 bit A/D converters; The input negative terminal of single power supply amplifier U1 is connected on the output terminal of single power supply amplifier U1 by first capacitor C 2 on the one hand, be connected on the AD_RFF pin of 12 bit A/D converters by second resistance R 2 on the other hand, the output terminal of single power supply amplifier U1 also is connected on the AD_RFF pin of 12 bit A/D converters by the 3rd resistance R 3, the power end of single power supply amplifier U1 is imported an operating voltage VCC, the AD_RIN pin of ground connection termination 12 bit A/D converters of single power supply amplifier U1;
The thermistor interface circuit comprises thermistor XS1, voltage follower U2, the 4th resistance R 4, the 5th resistance R 5, second capacitor C 3, and voltage follower U2 is LMV324; Thermistor XS1 connects with the 4th resistance R 4, the input anode of both public termination voltage follower U2, the input negative terminal of single power supply amplifier U2 in another termination thermistor voltage stabilizing drive source circuit of the 4th resistance R 4, on the 4th resistance R 4, to apply a reference voltage 4V096, the other end ground connection of thermistor XS1, the input negative terminal of voltage follower U2 connects the output terminal of voltage follower U2, forms a feedback; The output terminal of voltage follower U2 is by constituting the signal input part AUTO that the RC filtering circuit is connected to 12 bit A/D converters by the 5th resistance R 5 and second capacitor C 3; Described thermistor XS1 is the thermistor with negative temperature coefficient.
Owing to adopted technical scheme as above, thermistor voltage stabilizing drive source circuit of the present utility model adopts the voltage stabilizing chip LM4040 of TI company, and the precision of voltage regulation can reach 0.1%, thereby a high-precision reference voltage is provided can for thermistor XS1.Thermistor XS1 is the thermistor with negative temperature coefficient, and its temperature-measuring range can reach from subzero negative 40 degrees centigrade to 125 degrees centigrade, and the amplifier in the thermistor interface circuit adopts voltage follower LMV324, and quality is good, and price is low.
Description of drawings
Fig. 1 is the electrical schematic diagram of the utility model thermistor voltage stabilizing drive source circuit.
Fig. 2 is the electrical schematic diagram of the utility model thermistor interface circuit.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth embodiment of the present utility model.
A kind of temperature sensor interface circuit that the utility model provides comprises thermistor voltage stabilizing drive source circuit and and thermistor interface circuit.
Referring to Fig. 1, thermistor voltage stabilizing drive source circuit comprises voltage stabilizing chip B1, single power supply amplifier U1LMV934, first resistance R 1, second resistance R 2, the 3rd resistance R 3, electrochemical capacitor C1, first capacitor C 2, voltage stabilizing chip B1 is LM4040, and single power supply amplifier U1 is LMV934.
The voltage stabilizing chip B1 and first resistance R 1 are connected into a bleeder circuit, the AD_RIN pin of positive termination 12 bit A/D converters of voltage stabilizing chip B1, the negative terminal of voltage stabilizing chip B1 is connected with first resistance R 1, the other end of first resistance R 1 is imported an operating voltage VCC, the anode of electrochemical capacitor C1 inserts the input anode of single power supply amplifier U1 together with the common port of the voltage stabilizing chip B1 and first resistance R 1 and exports the reference voltage 4V096 of temperature-sensitive resistance interface circuit, and the negative terminal of electrochemical capacitor C1 connects the AD_RIN pin of 12 bit A/D converters; The input negative terminal of single power supply amplifier U1 is connected on the output terminal of single power supply amplifier U1 by first capacitor C 2 on the one hand, be connected on the AD_RFF pin of 12 bit A/D converters by second resistance R 2 on the other hand, the output terminal of single power supply amplifier U1 also is connected on the AD_RFF pin of 12 bit A/D converters by the 3rd resistance R 3, the power end of single power supply amplifier U1 is imported an operating voltage VCC, the AD_RIN pin of ground connection termination 12 bit A/D converters of single power supply amplifier U1;
Referring to Fig. 2, the thermistor interface circuit comprises thermistor XS1, voltage follower U2, the 4th resistance R 4, the 5th resistance R 5, second capacitor C 3, and voltage follower U2 is LMV324; Thermistor XS1 connects with the 4th resistance R 4, the input anode of both public termination voltage follower LMV324, the input negative terminal of single power supply amplifier U1 in another termination thermistor voltage stabilizing drive source circuit of the 4th resistance R 4, on the 4th resistance R 4, to apply a reference voltage 4V096, the other end ground connection of thermistor XS1, the input negative terminal of voltage follower U2 connects the output terminal of voltage follower LMV324, forms a feedback; The output terminal of voltage follower U2 is by constituting the signal input part AUTO that the RC filtering circuit is connected to 12 bit A/D converters by the 5th resistance R 5 and second capacitor C 3; Described thermistor XS1 is the thermistor with negative temperature coefficient.
AVCC is through parallel voltage-stabilizing chip B1 in Fig. 1, output voltage is 4.096V, offer the stable reference voltage of thermistor XS1, thermistor XS1 and 4 series connection of the 4th resistance R, dividing potential drop is through voltage follower, export stable voltage, output resistance is little, can use for rear end AD circuit, and computing can obtain to measure temperature through microcomputer.
More than show and described ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not subjected to the restriction of above-mentioned example; that describes in above-mentioned example and the instructions just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (1)
1. temperature sensor interface circuit, comprise thermistor voltage stabilizing drive source circuit and and the thermistor interface circuit;
Described thermistor voltage stabilizing drive source circuit comprises voltage stabilizing chip (B1), single power supply amplifier (U1), first resistance (R1), second resistance (R2), the 3rd resistance (R3), electrochemical capacitor (C1), first electric capacity (C2), and voltage stabilizing chip (B1) is LM4040; Voltage stabilizing chip (B1) is connected into a bleeder circuit with first resistance (R1), the AD_RIN pin of positive termination 12 bit A/D converters of voltage stabilizing chip (B1), the negative terminal of voltage stabilizing chip (B1) is connected with first resistance (R1), the other end of first resistance (R1) is imported an operating voltage VCC, the anode of electrochemical capacitor (C1) inserts the input anode of single power supply amplifier (U1) together with the common port of voltage stabilizing chip (LM4040) and first resistance (R1) and exports the reference voltage 4V096 of temperature-sensitive resistance interface circuit, and the negative terminal of electrochemical capacitor (C1) connects the AD_RIN pin of 12 bit A/D converters; The input negative terminal of single power supply amplifier (U1) is connected on the output terminal of single power supply amplifier (U1) by first electric capacity (C2) on the one hand, be connected on the AD RFF pin of 12 bit A/D converters by second resistance (R2) on the other hand, the output terminal of single power supply amplifier (U1) also is connected on the AD RFF pin of 12 bit A/D converters by the 3rd resistance (R3), the power end of single power supply amplifier (U1) is imported an operating voltage VCC, the AD_RIN pin of ground connection termination 12 bit A/D converters of single power supply amplifier (U1);
The thermistor interface circuit comprises thermistor (XS1), voltage follower (U2), the 4th resistance (R4), the 5th resistance (R5), second electric capacity (C3), and voltage follower (U2) is LMV324; Thermistor (XS1) is connected with the 4th resistance (R4), the input anode of both public termination voltage followers (U2), the input negative terminal of single power supply amplifier (U2) in another termination thermistor voltage stabilizing drive source circuit of the 4th resistance R 4, on the 4th resistance (R4), to apply a reference voltage 4V096, the other end ground connection of thermistor (XS1), the input negative terminal of voltage follower (U2) connects the output terminal of voltage follower (LMV324), forms a feedback; The output terminal of voltage follower (U2) is by constituting the signal input part AUTO that the RC filtering circuit is connected to 12 bit A/D converters by the 5th resistance (R5) and second electric capacity (C3); Described thermistor (XS1) is for having the thermistor of negative temperature coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206410079U CN201955169U (en) | 2010-12-03 | 2010-12-03 | Interface circuit of temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206410079U CN201955169U (en) | 2010-12-03 | 2010-12-03 | Interface circuit of temperature sensor |
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| Publication Number | Publication Date |
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| CN201955169U true CN201955169U (en) | 2011-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206410079U Expired - Fee Related CN201955169U (en) | 2010-12-03 | 2010-12-03 | Interface circuit of temperature sensor |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655310A (en) * | 2013-11-25 | 2015-05-27 | 联合汽车电子有限公司 | Temperature detection circuit and implementation method thereof |
| CN107490994A (en) * | 2016-06-11 | 2017-12-19 | 深圳华汽车科技有限公司 | New-energy automobile fused controlling system |
-
2010
- 2010-12-03 CN CN2010206410079U patent/CN201955169U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655310A (en) * | 2013-11-25 | 2015-05-27 | 联合汽车电子有限公司 | Temperature detection circuit and implementation method thereof |
| CN107490994A (en) * | 2016-06-11 | 2017-12-19 | 深圳华汽车科技有限公司 | New-energy automobile fused controlling system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110831 Termination date: 20151203 |
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| EXPY | Termination of patent right or utility model |