CN203465349U - Micro-power-consumption detection circuit based on sensitive resistor - Google Patents

Micro-power-consumption detection circuit based on sensitive resistor Download PDF

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Publication number
CN203465349U
CN203465349U CN201320421891.9U CN201320421891U CN203465349U CN 203465349 U CN203465349 U CN 203465349U CN 201320421891 U CN201320421891 U CN 201320421891U CN 203465349 U CN203465349 U CN 203465349U
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China
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analog
digital converter
power
microprocessor
triode
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CN201320421891.9U
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陈德传
陈雪亭
郑忠杰
范利良
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Hangzhou Dianzi University
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Hangzhou Dianzi University
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Abstract

The utility model relates to a micro-power-consumption detection circuit based on a sensitive resistor. The micro-power-consumption detection circuit comprises a sensor power supply control circuit and a differential analog-to-digital conversion signal processing circuit, specifically comprises a dry battery BAT, a triode VT1, a sensitive resistor RT, a precision resistor R1, a current-limiting resistor R2, an analog-to-digital converter IC1, a microprocessor IC2 and a filter capacitor C1, wherein a positive electrode of the dry battery BAT is connected with an emitter of the triode VT1; a collector of the triode VT1 is connected with one end of the sensitive resistor RT, and a power supply end VDD and a positive input end IN+ of the analog-to-digital converter IC1; and the other end of the sensitive resistor RT is connected with one end of the precision resistor R1, and a negative input end IN- and a reference voltage end REF of the analog-to-digital converter IC1. The micro-power-consumption detection circuit based on sensitive resistor has the advantages of simple circuit structure, low power consumption and high reliability.

Description

A kind of micro-power consumption detection circuit based on sensitive resistance
Technical field
The utility model belongs to industrial measurement and control field, relates to a kind of circuit, and particularly a kind of micro-power consumption detection circuit based on sensitive resistance, is applicable to adopt the battery powered detection occasion of making sensor with all kinds of sensitive resistances.
Background technology
With for example, to respectively the various electric resistance sensors of various physical quantitys or chemical analysis sensitivity (: thermistor, hygristor, strain resistor etc.) being widely applied, but a lot of occasions require to adopt dry cell just can power for a long time, require the power consumption of testing circuit as far as possible low, therefore, circuit structure also should be tried one's best simply.Physical quantity based on sensitive resistance or the conventional detection method of chemical analysis can be divided into several as follows at present: the one, and electric bridge or dividing potential drop detection method based on precision voltage source power supply; The 2nd, the sensitive resistance voltage drop detection method based on constant current source power supply; The 3rd, the electric circuit constitute device using sensitive resistance in inverter type operational amplifier the detection method combining with precision voltage source.The common problem that these detection methods exist is all to need precision voltage source or Precision Current Component, and circuit structure is more complicated, therefore, is also difficult to realize the detection of micro-power consumption.
Summary of the invention
The purpose of this utility model is the deficiency existing for prior art, proposes a kind of micro-power consumption detection circuit based on sensitive resistance.Difference A/D converter and the micro-power consumption microprocessor of this circuit based on micro-power consumption, do not need precision voltage source or current source, adopt regularly Relative detecting method, in non-detection constantly, this circuit is in dormant state, and the digital quantity after difference A/D converter is directly proportional to tested sensitive resistance value.
The utility model comprises sensor power-supplying circuit and difference analog to digital conversion signal processing circuit.
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 one end of current-limiting resistance R2, one 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, one 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, one 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.
The beneficial effects of the utility model are as follows:
The utility model utilizes difference A/D converter and micro-power consumption microprocessor of micro-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 after difference A/D converter is directly proportional to tested sensitive resistance value, the utility model circuit structure is simple, power consumption is extremely low, reliability is high.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, a kind of micro-power consumption detection circuit based on sensitive resistance, comprises sensor power-supplying circuit and difference analog to digital conversion signal processing circuit.
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 one end of current-limiting resistance R2, one 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, one 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, one 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.
The all devices that comprise analog to digital converter IC1, microprocessor IC2, triode VT1, dry cell BAT etc. that the utility model is used all adopt existing matured product, can obtain by market.For example: analog to digital converter adopts AS1524, 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 in the utility model 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 in Fig. 1 maxbetween funtcional relationship as the formula (1), sensitive resistance RT value wherein becomes with its corresponding physical quantity or chemical analysis, the program in microprocessor can calculate tested physical quantity or chemical analysis accordingly, and
Figure 2013204218919100002DEST_PATH_IMAGE002
.
Figure 2013204218919100002DEST_PATH_IMAGE004
(1)
The utility model course of work is as follows:
The utility model circuit general work that Fig. 1 shows is in timing sampling state, only have timed sequence in microprocessor IC2 by the default timing sampling time to after automatically wake microprocessor IC2 up, and then by the switch enable end of microprocessor IC2, send low level signal and make triode VT1 conducting to power to 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 to analog to digital converter IC1, and then, microprocessor IC2 can obtain the digital quantity being directly proportional to sensitive resistance RT as the formula (1) by serial data mouth, program in microprocessor can calculate tested physical quantity or chemical analysis accordingly.

Claims (1)

1. the micro-power consumption detection circuit based on sensitive resistance, is characterized in that comprising sensor power-supplying circuit and difference analog to digital conversion signal processing circuit;
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 one end of current-limiting resistance R2, one 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, one 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, one 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.
CN201320421891.9U 2013-07-16 2013-07-16 Micro-power-consumption detection circuit based on sensitive resistor Withdrawn - After Issue CN203465349U (en)

Priority Applications (1)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103344836A (en) * 2013-07-16 2013-10-09 杭州电子科技大学 Detection circuit of micro-power consumption resistance transducers
CN113702710A (en) * 2020-05-21 2021-11-26 圣邦微电子(北京)股份有限公司 Resistance test circuit and resistance test method
CN113702711A (en) * 2020-05-21 2021-11-26 圣邦微电子(北京)股份有限公司 Resistance test circuit and resistance test method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103344836A (en) * 2013-07-16 2013-10-09 杭州电子科技大学 Detection circuit of micro-power consumption resistance transducers
CN103344836B (en) * 2013-07-16 2015-07-22 杭州电子科技大学 Detection circuit of micro-power consumption resistance transducers
CN113702710A (en) * 2020-05-21 2021-11-26 圣邦微电子(北京)股份有限公司 Resistance test circuit and resistance test method
CN113702711A (en) * 2020-05-21 2021-11-26 圣邦微电子(北京)股份有限公司 Resistance test circuit and resistance test method

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