CN103344836A - Detection circuit of micro-power consumption resistance transducers - Google Patents
Detection circuit of micro-power consumption resistance transducers Download PDFInfo
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- CN103344836A CN103344836A CN2013102972751A CN201310297275A CN103344836A CN 103344836 A CN103344836 A CN 103344836A CN 2013102972751 A CN2013102972751 A CN 2013102972751A CN 201310297275 A CN201310297275 A CN 201310297275A CN 103344836 A CN103344836 A CN 103344836A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
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- 244000294411 Mirabilis expansa Species 0.000 claims description 4
- 235000013536 miso Nutrition 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- 239000000126 substance Substances 0.000 description 5
- 238000005070 sampling Methods 0.000 description 2
- AXZTUJBZCDBEOT-UHFFFAOYSA-N argon lithium Chemical compound [Li].[Ar] AXZTUJBZCDBEOT-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a detection circuit of micro-power consumption resistance transducers. The detection circuit of the micro-power consumption resistance transducers comprises a transducer power supply control circuit and a difference analog-digital conversion signal processing circuit, and particularly comprises a dry battery BAT, an audion VT1, a sensitive resistor RT, a precise resistor R1, a current-limiting resistor R2, an analog-digital converter IC1, a microprocessor IC2 and a filter capacitor C1. The positive electrode of the dry battery BAT is connected with the emitting electrode of the audion VT1, the collector electrode of the audion VT1 is connected with one end of the sensitive resistor RT, the power supply end VDD of the analog-digital converter IC1 and the positive input end IN+ of the analog-digital converter IC1, and the other end of the sensitive resistor RT is connected with one end of the precise resistor R1, the negative input end IN- of the analog-digital converter IC1, and the reference voltage end REF of the analog-digital converter IC1. The detection circuit of the micro-power consumption resistance transducers is simple in structure, extremely low in power consumption and high in reliability.
Description
Technical field
The invention belongs to the industrial measurement and control field, relate to a kind of circuit, particularly a kind of little power consumption electric resistance sensor class testing circuit is applicable to and adopts the battery powered detection occasion of making sensor with all kinds of sensitive resistances.
Background technology
With to respectively the various electric resistance sensors (for example: thermistor, hygristor, strain resistor etc.) of various physical quantitys or chemical analysis sensitivity having been obtained widely applying, but a lot of occasions require to adopt dry cell just can power for a long time, require the power consumption of testing circuit low as far as possible, therefore, circuit structure also should be tried one's best simply.At present can be divided into following several based on the physical quantity of sensitive resistance or the detection method commonly used of chemical analysis: one is based on electric bridge or the dividing potential drop detection method of precision voltage source power supply; Two are based on the sensitive resistance voltage drop detection method of constant current source power supply; The 3rd, the detection method that sensitive resistance is become device and combines with precision voltage source as the circuit bank in the inverter type operational amplifier.The common problem that these detection methods exist is all to need precision voltage source or precision current source, and circuit structure is complicated, therefore, also is difficult to realize the detection of little power consumption.
Summary of the invention
The objective of the invention is the deficiency at the prior art existence, propose a kind of little power consumption electric resistance sensor class testing circuit.This circuit is based on difference A/D converter and little power consumption microprocessor of little power consumption, do not need precision voltage source or current source, adopt regularly detection method relatively, in non-detection constantly, this circuit is in dormant state, and the digital quantity behind difference A/D converter is directly proportional with tested sensitive resistance value.
The present invention includes sensor power-supplying circuit and difference analog to digital conversion signal processing circuit.
The sensor power-supplying circuit comprises dry cell BAT, triode VT1, sensitive resistance RT, precision resistance R1, current-limiting resistance R2; The minus earth of dry cell BAT, the positive pole of dry cell BAT is connected with emitter, the circuit power end VCC end of triode VT1, the base stage of triode VT1 is connected with the end of current-limiting resistance R2, the collector of triode VT1 is connected with the end of sensitive resistance RT, the power end vdd terminal of analog to digital converter IC1 and the positive input terminal IN+ end of analog to digital converter IC1, the other end of sensitive resistance RT is connected the other end ground connection of precision resistance R1 with the end of precision resistance R1, the negative input end IN-end of analog to digital converter IC1 and the reference voltage terminal REF end of analog to digital converter IC1;
Difference analog to digital conversion signal processing circuit comprises analog to digital converter IC1, microprocessor IC2, filter capacitor C1; The input end of clock SCLK end of analog to digital converter IC1 is connected with the output terminal of clock SCK end of microprocessor IC2, the serial data end DOUT end of analog to digital converter IC1 is connected with the serial data end I/O2 end of microprocessor IC2, the conversion start end CNVST end of analog to digital converter IC1 is connected with the transition enabled end MISO end of microprocessor IC2,, the ground end GND end ground connection of analog to digital converter IC1; The switch enable end I/O1 end of microprocessor IC2 is connected with the other end of current-limiting resistance R2, the power end vdd terminal of microprocessor IC2 is connected with the end of circuit power end VCC end, filter capacitor C1, the power end GND end ground connection of microprocessor IC2, the other end ground connection of filter capacitor C1.
Beneficial effect of the present invention is as follows:
The present invention utilizes difference A/D converter and little power consumption microprocessor of little power consumption, do not need precision voltage source or current source, in non-detection constantly, this circuit is in dormant state, and the digital quantity behind difference A/D converter is directly proportional with tested sensitive resistance value, and circuit structure of the present invention is simple, power consumption is extremely low, reliability is high.
Description of drawings
Fig. 1 is circuit diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, little power consumption electric resistance sensor class testing circuit comprises sensor power-supplying circuit and difference analog to digital conversion signal processing circuit.
The sensor power-supplying circuit comprises dry cell BAT, triode VT1, sensitive resistance RT, precision resistance R1, current-limiting resistance R2; The minus earth of dry cell BAT, the positive pole of dry cell BAT is connected with emitter, the circuit power end VCC end of triode VT1, the base stage of triode VT1 is connected with the end of current-limiting resistance R2, the collector of triode VT1 is connected with the end of sensitive resistance RT, the power end vdd terminal of analog to digital converter IC1 and the positive input terminal IN+ end of analog to digital converter IC1, the other end of sensitive resistance RT is connected the other end ground connection of precision resistance R1 with the end of precision resistance R1, the negative input end IN-end of analog to digital converter IC1 and the reference voltage terminal REF end of analog to digital converter IC1;
Difference analog to digital conversion signal processing circuit comprises analog to digital converter IC1, microprocessor IC2, filter capacitor C1; The input end of clock SCLK end of analog to digital converter IC1 is connected with the output terminal of clock SCK end of microprocessor IC2, the serial data end DOUT end of analog to digital converter IC1 is connected with the serial data end I/O2 end of microprocessor IC2, the conversion start end CNVST end of analog to digital converter IC1 is connected with the transition enabled end MISO end of microprocessor IC2, the ground end GND end ground connection of analog to digital converter IC1, the switch enable end I/O1 end of microprocessor IC2 is connected with the other end of current-limiting resistance R2, the power end vdd terminal of microprocessor IC2 and circuit power end VCC end, the end of filter capacitor C1 connects, the power end GND end ground connection of microprocessor IC2, the other end ground connection of filter capacitor C1.
All devices of analog to digital converter IC1, microprocessor IC2, triode VT1, dry cell BAT etc. that comprise used in the present invention all adopt existing matured product, can obtain by market.For example: analog to digital converter adopts AS1524, and microprocessor adopts AVR series or MSP430 series, and triode adopts 9013, and dry cell adopts ER series lithium argon battery etc.
Main circuit parameter matching relationship among the present invention is as follows:
The maximum number amount D of the digital quantity D of analog to digital converter serial data end output and sensitive resistance RT, precision resistance R1, analog to digital converter output among Fig. 1
MaxBetween funtcional relationship as the formula (1), sensitive resistance RT value wherein becomes with its physical quantity corresponding or chemical analysis, the program in the microprocessor can calculate tested physical quantity or chemical analysis accordingly, and
（1）
The course of work of the present invention is as follows:
The circuit general work of the present invention that Fig. 1 shows is in the timing sampling state, have only when the timed sequence among the microprocessor IC2 by the default timing sampling time to after wake microprocessor IC2 automatically up, and then send low level signal by the switch enable end of microprocessor IC2 triode VT1 conducting is powered to give sensitive resistance RT branch road and analog to digital converter IC1, simultaneously, the transition enabled end MISO of microprocessor IC2 sends the instruction of carrying out analog to digital conversion work for analog to digital converter IC1, and then, microprocessor IC2 can obtain as the formula (1) the digital quantity that is directly proportional with sensitive resistance RT by the serial data mouth, and the program in the microprocessor can calculate tested physical quantity or chemical analysis accordingly.
Claims (1)
1. little power consumption electric resistance sensor class testing circuit comprises sensor power-supplying circuit and difference analog to digital conversion signal processing circuit, it is characterized in that:
The sensor power-supplying circuit comprises dry cell BAT, triode VT1, sensitive resistance RT, precision resistance R1, current-limiting resistance R2; The minus earth of dry cell BAT, the emitter of the positive pole of dry cell BAT and triode VT1, circuit power end VCC holds connection, the base stage of triode VT1 is connected with the end of current-limiting resistance R2, the end of the collector of triode VT1 and sensitive resistance RT, the power end vdd terminal of analog to digital converter IC1 and the positive input terminal IN+ of analog to digital converter IC1 end connect, the end of the other end of sensitive resistance RT and precision resistance R1, the negative input end IN-end of analog to digital converter IC1 and the reference voltage terminal REF end of analog to digital converter IC1 connect, the other end ground connection of precision resistance R1, the ground end GND end ground connection of analog to digital converter IC1;
Difference analog to digital conversion signal processing circuit comprises analog to digital converter IC1, microprocessor IC2, filter capacitor C1; The input end of clock SCLK end of analog to digital converter IC1 is connected with the output terminal of clock SCK end of microprocessor IC2, the serial data end DOUT end of analog to digital converter IC1 is connected with the serial data end I/O2 end of microprocessor IC2, the conversion start end CNVST end of analog to digital converter IC1 is connected with the transition enabled end MISO end of microprocessor IC2, the ground end ground connection of analog to digital converter IC1, the switch enable end I/O1 end of microprocessor IC2 is connected with the other end of current-limiting resistance R2, the power end vdd terminal of microprocessor IC2 and circuit power end VCC end, the end of filter capacitor C1 connects, the power end GND end ground connection of microprocessor IC2, the other end ground connection of filter capacitor C1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310297275.1A CN103344836B (en) | 2013-07-16 | 2013-07-16 | Detection circuit of micro-power consumption resistance transducers |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310297275.1A CN103344836B (en) | 2013-07-16 | 2013-07-16 | Detection circuit of micro-power consumption resistance transducers |
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| CN103344836A true CN103344836A (en) | 2013-10-09 |
| CN103344836B CN103344836B (en) | 2015-07-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711835A (en) * | 2018-06-13 | 2018-10-26 | 方碧水 | A kind of line temperature detection device and application method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88105895A (en) * | 1988-04-27 | 1988-10-12 | 伍占禧 | Solid-state automatic controller with isolation control end capable of being fully integrated |
| CN2308095Y (en) * | 1997-07-11 | 1999-02-17 | 济南艾诺仪器有限公司 | Intelligent safety performance tester |
| CN101750163A (en) * | 2010-01-05 | 2010-06-23 | 杭州电子科技大学 | Temperature humidity gauge based on MSP 430 singlechip |
| CN202066615U (en) * | 2011-01-18 | 2011-12-07 | 浙江恒强科技股份有限公司 | Improved temperature measuring circuit |
| CN203465349U (en) * | 2013-07-16 | 2014-03-05 | 杭州电子科技大学 | Micro-power-consumption detection circuit based on sensitive resistor |
-
2013
- 2013-07-16 CN CN201310297275.1A patent/CN103344836B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88105895A (en) * | 1988-04-27 | 1988-10-12 | 伍占禧 | Solid-state automatic controller with isolation control end capable of being fully integrated |
| CN2308095Y (en) * | 1997-07-11 | 1999-02-17 | 济南艾诺仪器有限公司 | Intelligent safety performance tester |
| CN101750163A (en) * | 2010-01-05 | 2010-06-23 | 杭州电子科技大学 | Temperature humidity gauge based on MSP 430 singlechip |
| CN202066615U (en) * | 2011-01-18 | 2011-12-07 | 浙江恒强科技股份有限公司 | Improved temperature measuring circuit |
| CN203465349U (en) * | 2013-07-16 | 2014-03-05 | 杭州电子科技大学 | Micro-power-consumption detection circuit based on sensitive resistor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711835A (en) * | 2018-06-13 | 2018-10-26 | 方碧水 | A kind of line temperature detection device and application method |
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