CN105116022A - Water quality detection circuit designed on basis of single supply quadri-operational amplifier - Google Patents
Water quality detection circuit designed on basis of single supply quadri-operational amplifier Download PDFInfo
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- CN105116022A CN105116022A CN201510606080.XA CN201510606080A CN105116022A CN 105116022 A CN105116022 A CN 105116022A CN 201510606080 A CN201510606080 A CN 201510606080A CN 105116022 A CN105116022 A CN 105116022A
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Abstract
The invention discloses a water quality detection circuit designed on the basis of a single supply quadri-operational amplifier. The water quality detection circuit comprises a quadri-operational amplifier circuit, a probe circuit, a display circuit and a power supply circuit, wherein the probe circuit is connected with the quadri-operational amplifier circuit; the power supply circuit is connected with both the probe circuit and the quadri-operational amplifier circuit; the display circuit is connected with the quadri-operational amplifier circuit; the probe circuit comprises a probe T and a potentiometer W2; the probe T comprises two independent conductive metals; any one conductive metal is connected with an in-phase input end of a second operational amplifier module A2 and the other conductive metal is connected with the other end of the power supply circuit; the display circuit comprises a light emitting diode set D4 and a resistor R5; the water quality detection circuit designed by using the quadri-operational amplifier can be used for processing water quality detection data, by using excellent working performance of the water quality detection circuit, water quality change data can be effectively measured, water quality conditions in the area can be determined and detected and the whole circuit has the characteristics of scientific design and reasonable application.
Description
Technical field
The present invention relates to the field such as electronics science, detection technique, specifically, is a kind of water quality detection circuit based on the design of single supply four-operational amplifier.
Background technology
Operational amplifier (being called for short " amplifier ") is the circuit unit with very high-amplification-factor.In side circuit, usually jointly form certain functional module in conjunction with feedback network.It is a kind of amplifier with special Coupling circuit and feedback.Its output signal can be that input signal adds, subtracts or the result of the mathematical operation such as differential, integration.Owing to being applied in analog computer in early days, in order to realize mathematical operation, therefore gain the name " operational amplifier ".Amplifier is the circuit unit that an angle from function is named, and can be realized, also can be implemented in the middle of semi-conductor chip by discrete device.Along with the development of semiconductor technology, most amplifier exists with the form of single-chip.
Amplifier has two input ends: inverting input, in-phase input end and an output terminal.Also inverting input end, non-inverting input end and output terminal is called as respectively.When voltage U-be added in inverting input and common port (common port to be voltage be zero point, it is equivalent to the datum node in circuit) between, and its actual direction from inverting input higher than common port time, output voltage U actual direction then points to output terminal from common port, and namely both directions are just in time contrary.When input voltage U+ is added between in-phase input end and common port, the actual direction of both U and U+ is just identical relative to common port.
Generally amplifier can be considered as simply: the high-gain direct-coupling voltage amplification unit with a signal output port (Out) and homophase, anti-phase two high impedance input ends, amplifier therefore can be adopted to make homophase, anti-phase and differential amplifier.
The power supply mode of amplifier divides dual power supply and single power supply two kinds.For dual power supply amplifier, its output can change in no-voltage both sides, and exporting when differential input voltage is zero also can zero setting.Adopt the amplifier of single power supply, export a certain range between power supply and ground.
The input current potential of amplifier requires higher than a certain numerical value of negative supply usually, and lower than a certain numerical value of positive supply.Amplifier through particular design can allow to input current potential in the whole interval change from negative supply to positive supply, is even also allowed to slightly higher than positive supply or slightly lower than negative supply.This amplifier is called rail-to-rail (rail-to-rail) input operational amplifier.
The output signal of operational amplifier is directly proportional to the signal voltage difference of two input ends, have at audio section: output voltage=A0(E1-E2), wherein, A0 is that the low frequency open-loop gain of amplifier is (as 100dB, namely 100000 times), E1 is the applied signal voltage of in-phase end, and E2 is the applied signal voltage of end of oppisite phase.
Summary of the invention
The object of the present invention is to provide a kind of water quality detection circuit based on the design of single supply four-operational amplifier, a water quality detection circuit that can be used for water quality treatment detection data utilizing four-operational amplifier to design, utilize the serviceability of its brilliance effectively can measure the delta data of water quality, and determine to detect the water quality situation in region, whole circuit has design science, uses the characteristics such as reasonable.
The present invention is achieved through the following technical solutions: a kind of water quality detection circuit based on the design of single supply four-operational amplifier, comprise four-operational amplifier circuit, probe circuit, display circuit and power circuit, described probe circuit connects four-operational amplifier circuit, described power circuit connects probe circuit and four-operational amplifier circuit respectively, and described display circuit connects four-operational amplifier circuit.
Further to better implement the present invention, be provided with following structure especially: described four operational amplification circuits comprise four-operational amplifier and peripheral circuit, described four-operational amplifier comprises the first amplifier modules A 1, second amplifier modules A 2, 3rd amplifier modules A 3 and four high guaily unit modules A 4, described peripheral circuit comprises potentiometer W1, resistance R2, resistance R3, K switch 1, resistance R4, potentiometer W3 and potentiometer W4, two stiff ends of described potentiometer W1 are connected with power circuit and adjustable end connects the first input end of the first amplifier modules A 1, the described output terminal of the first amplifier modules A 1 is connected with the first contact jaw of K switch 1, the second input end first end of contact resistance R2 and the first end of resistance R3 respectively of described first amplifier modules A 1, second end of described resistance R3 is connected with the first contact jaw of K switch 1, the second end ground connection of described resistance R2, the first input end of described second amplifier modules A 2 is connected with probe circuit, the second input end of described second amplifier modules A 2 and output terminal short circuit, the described output terminal of the second amplifier modules A 2 is connected with the second contact jaw of K switch 1, the fixing contact jaw of described K switch 1 is the first end of contact resistance R4, the second input end of the 3rd amplifier modules A 3 and the first input end of four high guaily unit modules A 4 respectively, two stiff ends of described potentiometer W3 and potentiometer W4 are connected with power circuit respectively, and the adjustable end of potentiometer W3 connects the first input end of the 3rd amplifier modules A 3, and the adjustable end of potentiometer W4 connects the second input end of the 3rd amplifier modules A 4, described four high guaily unit modules A 3 is all connected with the input end of display circuit with the output terminal of four high guaily unit modules A 4.
Further to better implement the present invention, be provided with following structure especially: described peripheral circuit also comprises diode D1 and diode D2, the output terminal of described first amplifier modules A 1 is connected with the first contact jaw of K switch 1 by diode D1, and the positive pole of diode D1 is connected with the output terminal of the first amplifier modules A 1; The output terminal of described second amplifier modules A 2 is connected with the second contact jaw of K switch 1 by diode D2, and the positive pole of diode D2 is connected with the output terminal of the second amplifier modules A 2.
Further to better implement the present invention, be provided with following structure especially: described probe circuit comprises probe T and potentiometer W2, described probe T is two independently conducting metals, any conducting metal connects the first input end of the second amplifier modules A 2, and any conducting metal is connected with one end of power circuit by potentiometer W2, and another root conducting metal is connected with the other end of power circuit.
Further to better implement the present invention, following structure is provided with especially: described power circuit comprises power supply VCC and K switch 2, second end of the negative pole contact resistance R2 of described power supply VCC and another root conducting metal; The positive pole of described power supply VCC connects first stiff end of potentiometer W1, potentiometer W2, potentiometer W3 and potentiometer W4 respectively by K switch 2, and second stiff end of described potentiometer W1, potentiometer W3, potentiometer W4 and the conducting metal be not connected with potentiometer W2 are all connected with the negative pole of power supply VCC.
Further to better implement the present invention, be provided with following structure especially: described display circuit comprises light emitting diode group D4, resistance R5, the positive terminal of described light emitting diode group D4 connects the output terminal of the 3rd amplifier modules A 3 and four high guaily unit modules A 4 respectively, and the negative pole end of described light emitting diode group D4 is connected with the negative pole of power supply VCC by resistance R5.
Further to better implement the present invention, be provided with following structure especially: also comprise power indicating circuit, described power indicating circuit comprises LED and resistance R1, the positive pole of described LED is connected with K switch 2, and the negative pole of described LED is connected with the negative pole of power supply VCC by resistance R1.
Further to better implement the present invention, be provided with following structure especially: the first input end of described first amplifier modules A 1, second amplifier modules A 2, the 3rd amplifier modules A 3 and four high guaily unit modules A 4 is all in-phase input end, the second input end of described first amplifier modules A 1, second amplifier modules A 2, the 3rd amplifier modules A 3 and four high guaily unit modules A 4 is all inverting input.
The present invention compared with prior art, has the following advantages and beneficial effect:
A water quality detection circuit that can be used for water quality treatment detection data that the present invention utilizes four-operational amplifier to design, utilize the serviceability of its brilliance effectively can measure the delta data of water quality, and determine to detect the water quality situation in region, whole circuit has design science, uses the characteristics such as reasonable.
Accompanying drawing explanation
Fig. 1 is fundamental diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1:
A kind of water quality detection circuit based on the design of single supply four-operational amplifier, as shown in Figure 1, be provided with following structure especially: comprise four-operational amplifier circuit, probe circuit, display circuit and power circuit, described probe circuit connects four-operational amplifier circuit, described power circuit connects probe circuit and four-operational amplifier circuit respectively, and described display circuit connects four-operational amplifier circuit.
A water quality detection circuit that can be used for water quality treatment detection data utilizing four-operational amplifier to design, utilize the serviceability of its brilliance effectively can measure the delta data of water quality, and determine to detect the water quality situation in region, whole circuit has design science, uses the characteristics such as reasonable.
Embodiment 2:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, be provided with following structure especially: described four operational amplification circuits comprise four-operational amplifier and peripheral circuit, described four-operational amplifier comprises the first amplifier modules A 1, second amplifier modules A 2, 3rd amplifier modules A 3 and four high guaily unit modules A 4, described peripheral circuit comprises potentiometer W1, resistance R2, resistance R3, K switch 1, resistance R4, potentiometer W3 and potentiometer W4, two stiff ends of described potentiometer W1 are connected with power circuit and adjustable end connects the in-phase input end (+) of the first amplifier modules A 1, the output terminal (out) of described first amplifier modules A 1 is connected with the first contact jaw (a) of K switch 1, inverting input (-) first end of contact resistance R2 and the first end of resistance R3 respectively of described first amplifier modules A 1, second end of described resistance R3 is connected with the first contact jaw a of K switch 1, the second end ground connection of described resistance R2, the in-phase input end (+) of described second amplifier modules A 2 is connected with probe circuit, inverting input (-) and output terminal (out) short circuit of described second amplifier modules A 2, the output terminal (out) of described second amplifier modules A 2 is connected with the second contact jaw (b) of K switch 1, the fixing contact jaw of described K switch 1 is the first end of contact resistance R4, the inverting input (-) of the 3rd amplifier modules A 3 and the in-phase input end (+) of four high guaily unit modules A 4 respectively, two stiff ends of described potentiometer W3 and potentiometer W4 are connected with power circuit respectively, and the adjustable end of potentiometer W3 connects the in-phase input end (+) of the 3rd amplifier modules A 3, the adjustable end of potentiometer W4 connects the inverting input (-) of the 3rd amplifier modules A 4, described four high guaily unit modules A 3 is all connected with the input end of display circuit with the output terminal (out) of four high guaily unit modules A 4.
Embodiment 3:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, be provided with following structure especially: described peripheral circuit also comprises diode D1 and diode D2, the output terminal (out) of described first amplifier modules A 1 is connected with the first contact jaw (a) of K switch 1 by diode D1, and the positive pole of diode D1 is connected with the output terminal (out) of the first amplifier modules A 1; The output terminal (out) of described second amplifier modules A 2 is connected with the second contact jaw (b) of K switch 1 by diode D2, and the positive pole of diode D2 is connected with the output terminal (out) of the second amplifier modules A 2.
Embodiment 4:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, be provided with following structure especially: described probe circuit comprises probe T and potentiometer W2, described probe T is two independently conducting metals, any conducting metal connects the in-phase input end of the second amplifier modules A 2, and any conducting metal is connected with one end of power circuit by potentiometer W2, and another root conducting metal is connected with the other end of power circuit.
Embodiment 5:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, be provided with following structure especially: described power circuit comprises power supply VCC and K switch 2, second end of the negative pole contact resistance R2 of described power supply VCC and another root conducting metal; The positive pole of described power supply VCC connects first stiff end of potentiometer W1, potentiometer W2, potentiometer W3 and potentiometer W4 respectively by K switch 2, and second stiff end of described potentiometer W1, potentiometer W3, potentiometer W4 and the conducting metal be not connected with potentiometer W2 are all connected with the negative pole of power supply VCC.
Embodiment 6:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, be provided with following structure especially: described display circuit comprises light emitting diode group D4, resistance R5, the positive terminal of described light emitting diode group D4 connects the output terminal (out) of the 3rd amplifier modules A 3 and four high guaily unit modules A 4 respectively, and the negative pole end of described light emitting diode group D4 is connected with the negative pole of power supply VCC by resistance R5.
Embodiment 7:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, be provided with following structure especially: also comprise power indicating circuit, described power indicating circuit comprises LED and resistance R1, the positive pole of described LED is connected with K switch 2, and the negative pole of described LED is connected with the negative pole of power supply VCC by resistance R1.
Adjustment potentiometer W1 makes the output voltage of the first amplifier modules A 1 with the change of light intensity between 0 ~ 4V.Probe T adopt two sheet metals, put it in water, two bar to bar resistance by with water intermediate ion number and change, the second amplifier modules A 2 exports and also changes, by potentiometer W2 adjust export.3rd amplifier modules A 3, four high guaily unit modules A 4 form window comparator, and potentiometer W3 and potentiometer W4 determines window ranges.As VA4+ < VA4-< VA3+, VA4
outfor " 0 ", VA3
outfor " 1 ", light emitting diode group D4 is ruddiness; As VA4-< VA4+ < VA3+, VA4
out=VA3
out=" 1 ", light emitting diode group D4 is orange light; As VA3+ < VA4-, VA3
out=" 0 ", VA4
out=" 1 ", light emitting diode group D4 is green glow.
By judging different light color, interface judges water quality scope of residing period.
The above is only preferred embodiment of the present invention, and not do any pro forma restriction to the present invention, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present invention, all falls within protection scope of the present invention.
Claims (8)
1. the water quality detection circuit based on the design of single supply four-operational amplifier, it is characterized in that: comprise four-operational amplifier circuit, probe circuit, display circuit and power circuit, described probe circuit connects four-operational amplifier circuit, described power circuit connects probe circuit and four-operational amplifier circuit respectively, and described display circuit connects four-operational amplifier circuit.
2. a kind of water quality detection circuit based on the design of single supply four-operational amplifier according to claim 1, it is characterized in that: described four operational amplification circuits comprise four-operational amplifier and peripheral circuit, described four-operational amplifier comprises the first amplifier modules A 1, second amplifier modules A 2, 3rd amplifier modules A 3 and four high guaily unit modules A 4, described peripheral circuit comprises potentiometer W1, resistance R2, resistance R3, K switch 1, resistance R4, potentiometer W3 and potentiometer W4, two stiff ends of described potentiometer W1 are connected with power circuit and adjustable end connects the first input end of the first amplifier modules A 1, the described output terminal of the first amplifier modules A 1 is connected with the first contact jaw of K switch 1, the second input end first end of contact resistance R2 and the first end of resistance R3 respectively of described first amplifier modules A 1, second end of described resistance R3 is connected with the first contact jaw of K switch 1, the second end ground connection of described resistance R2, the first input end of described second amplifier modules A 2 is connected with probe circuit, the second input end of described second amplifier modules A 2 and output terminal short circuit, the described output terminal of the second amplifier modules A 2 is connected with the second contact jaw of K switch 1, the fixing contact jaw of described K switch 1 is the first end of contact resistance R4, the second input end of the 3rd amplifier modules A 3 and the first input end of four high guaily unit modules A 4 respectively, two stiff ends of described potentiometer W3 and potentiometer W4 are connected with power circuit respectively, and the adjustable end of potentiometer W3 connects the first input end of the 3rd amplifier modules A 3, and the adjustable end of potentiometer W4 connects the second input end of the 3rd amplifier modules A 4, described four high guaily unit modules A 3 is all connected with the input end of display circuit with the output terminal of four high guaily unit modules A 4.
3. a kind of water quality detection circuit based on the design of single supply four-operational amplifier according to claim 2, it is characterized in that: described peripheral circuit also comprises diode D1 and diode D2, the output terminal of described first amplifier modules A 1 is connected with the first contact jaw of K switch 1 by diode D1, and the positive pole of diode D1 is connected with the output terminal of the first amplifier modules A 1; The output terminal of described second amplifier modules A 2 is connected with the second contact jaw of K switch 1 by diode D2, and the positive pole of diode D2 is connected with the output terminal of the second amplifier modules A 2.
4. a kind of water quality detection circuit based on the design of single supply four-operational amplifier according to claim 3, it is characterized in that: described probe circuit comprises probe T and potentiometer W2, described probe T is two independently conducting metals, any conducting metal connects the first input end of the second amplifier modules A 2, and any conducting metal is connected with one end of power circuit by potentiometer W2, and another root conducting metal is connected with the other end of power circuit.
5. a kind of water quality detection circuit based on the design of single supply four-operational amplifier according to claim 4, it is characterized in that: described power circuit comprises power supply VCC and K switch 2, second end of the negative pole contact resistance R2 of described power supply VCC and another root conducting metal; The positive pole of described power supply VCC connects first stiff end of potentiometer W1, potentiometer W2, potentiometer W3 and potentiometer W4 respectively by K switch 2, and second stiff end of described potentiometer W1, potentiometer W3, potentiometer W4 and the conducting metal be not connected with potentiometer W2 are all connected with the negative pole of power supply VCC.
6. a kind of water quality detection circuit based on the design of single supply four-operational amplifier according to claim 5, it is characterized in that: described display circuit comprises light emitting diode group D4, resistance R5, the positive terminal of described light emitting diode group D4 connects the output terminal of the 3rd amplifier modules A 3 and four high guaily unit modules A 4 respectively, and the negative pole end of described light emitting diode group D4 is connected with the negative pole of power supply VCC by resistance R5.
7. a kind of water quality detection circuit based on the design of single supply four-operational amplifier according to claim 6, it is characterized in that: also comprise power indicating circuit, described power indicating circuit comprises LED and resistance R1, the positive pole of described LED is connected with K switch 2, and the negative pole of described LED is connected with the negative pole of power supply VCC by resistance R1.
8. a kind of water quality detection circuit based on the design of single supply four-operational amplifier according to claim 7, it is characterized in that: the first input end of described first amplifier modules A 1, second amplifier modules A 2, the 3rd amplifier modules A 3 and four high guaily unit modules A 4 is all in-phase input end, the second input end of described first amplifier modules A 1, second amplifier modules A 2, the 3rd amplifier modules A 3 and four high guaily unit modules A 4 is all inverting input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510606080.XA CN105116022A (en) | 2015-09-22 | 2015-09-22 | Water quality detection circuit designed on basis of single supply quadri-operational amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510606080.XA CN105116022A (en) | 2015-09-22 | 2015-09-22 | Water quality detection circuit designed on basis of single supply quadri-operational amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN105116022A true CN105116022A (en) | 2015-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510606080.XA Pending CN105116022A (en) | 2015-09-22 | 2015-09-22 | Water quality detection circuit designed on basis of single supply quadri-operational amplifier |
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| CN (1) | CN105116022A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106088234A (en) * | 2016-08-03 | 2016-11-09 | 张萍 | A kind of air water machine with water quality monitoring function |
| CN116743514A (en) * | 2023-08-16 | 2023-09-12 | 长春市鑫鸿图科技有限公司 | Power supply circuit of communication module |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575784A (en) * | 2012-08-07 | 2014-02-12 | 陕西福天宝环保科技有限公司 | Design method of water hardness detection circuit |
| CN104535520A (en) * | 2015-01-09 | 2015-04-22 | 成都海兰天澄科技有限公司 | Automatic COD detector capable of being remotely controlled |
| CN104614408A (en) * | 2013-11-04 | 2015-05-13 | 成都天宇创新科技有限公司 | Simple water quality detection circuit |
| CN204374132U (en) * | 2014-12-29 | 2015-06-03 | 欧陆分析技术服务(苏州)有限公司 | A kind of practical water quality testing meter |
| CN204989091U (en) * | 2015-09-22 | 2016-01-20 | 成都乐维斯科技有限公司 | Water quality testing circuit based on single four operational amplifier of power design |
-
2015
- 2015-09-22 CN CN201510606080.XA patent/CN105116022A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575784A (en) * | 2012-08-07 | 2014-02-12 | 陕西福天宝环保科技有限公司 | Design method of water hardness detection circuit |
| CN104614408A (en) * | 2013-11-04 | 2015-05-13 | 成都天宇创新科技有限公司 | Simple water quality detection circuit |
| CN204374132U (en) * | 2014-12-29 | 2015-06-03 | 欧陆分析技术服务(苏州)有限公司 | A kind of practical water quality testing meter |
| CN104535520A (en) * | 2015-01-09 | 2015-04-22 | 成都海兰天澄科技有限公司 | Automatic COD detector capable of being remotely controlled |
| CN204989091U (en) * | 2015-09-22 | 2016-01-20 | 成都乐维斯科技有限公司 | Water quality testing circuit based on single four operational amplifier of power design |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106088234A (en) * | 2016-08-03 | 2016-11-09 | 张萍 | A kind of air water machine with water quality monitoring function |
| CN116743514A (en) * | 2023-08-16 | 2023-09-12 | 长春市鑫鸿图科技有限公司 | Power supply circuit of communication module |
| CN116743514B (en) * | 2023-08-16 | 2023-11-07 | 长春市鑫鸿图科技有限公司 | Power supply circuit of communication module |
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Application publication date: 20151202 |