CN110346015A - Electric pole type water logging detection circuit and water sensor - Google Patents
Electric pole type water logging detection circuit and water sensor Download PDFInfo
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- CN110346015A CN110346015A CN201910716928.2A CN201910716928A CN110346015A CN 110346015 A CN110346015 A CN 110346015A CN 201910716928 A CN201910716928 A CN 201910716928A CN 110346015 A CN110346015 A CN 110346015A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 238000001514 detection method Methods 0.000 title claims abstract description 40
- 230000003321 amplification Effects 0.000 claims abstract description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 9
- 238000000819 phase cycle Methods 0.000 claims abstract description 5
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims description 28
- 239000003990 capacitor Substances 0.000 claims description 26
- 239000004065 semiconductor Substances 0.000 claims description 26
- 230000008878 coupling Effects 0.000 claims description 22
- 238000010168 coupling process Methods 0.000 claims description 22
- 238000005859 coupling reaction Methods 0.000 claims description 22
- 230000009467 reduction Effects 0.000 claims description 16
- 230000009466 transformation Effects 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 11
- 230000003750 conditioning effect Effects 0.000 claims description 7
- 230000001052 transient effect Effects 0.000 claims description 4
- 238000005538 encapsulation Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000002441 reversible effect Effects 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims description 2
- 241000208340 Araliaceae Species 0.000 claims 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims 1
- 235000003140 Panax quinquefolius Nutrition 0.000 claims 1
- 235000008434 ginseng Nutrition 0.000 claims 1
- 239000000523 sample Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
- G01F23/241—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid for discrete levels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
- G01F23/241—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid for discrete levels
- G01F23/243—Schematic arrangements of probes combined with measuring circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The present invention provides a kind of electric pole type water logging detection circuits, comprising: first electrode signal input unit is used to convert amplification received first pwm signal of input terminal, and couples first electrode through output end；Second electrode signal input unit is used to convert amplification received second pwm signal of input terminal, and couples second electrode through output end；Comparing unit, first input end couple first electrode, and the second input terminal couples reference voltage signal, for comparing the voltage and the reference voltage signal of first electrode；And signal output unit, input terminal couple the output end of the comparing unit, for zoom comparison unit output signal and as detection signal output；Wherein, the first electrode signal input unit and second electrode signal input unit are output to pwm signal period on electrode and pulsewidth is identical, and phase sequence differs 180 degree, and signal dutyfactor D≤5%.Circuit detection accuracy is high, long service life and is suitable for the equipment such as outdoor charging pile and uses.
Description
Technical field
The present invention relates to sensing detection circuit fields, and in particular to a kind of electric pole type water logging detection circuit and water logging sensing
Device.
Background technique
Contact water sensor usually uses copper nickel plating probe, and detection circuit is by being added between two probes
Voltage is to determine whether there is water.Existing contact water sensor, detection circuit is fairly simple, applies between two probes
Add certain single-phase voltage, easily corrodes electrode after repeated detection has water, service life is short.In addition, electrode has interference voltage
Easily cause the damage of detection part circuit.
Chinese patent " detection circuit and detection method of TDS " (CN103675023A) discloses the detection electricity of TDS a kind of
Road and detection method drive water quality probe face by replacing on-load voltage to the both ends of water quality probe, avoid due to water quality
Probe persistently loads cell reaction caused by DC voltage, thus to water when improving water quality TDS detection accuracy, avoiding detecting
The influence of matter and the service life for extending water quality probe.However the circuit structure of the patent disclosure is relatively simple, still can not
Reach ideal detection accuracy and service life, and poor anti jamming capability, the equipment such as outdoor charging pile can not be suitable for.
Summary of the invention
Based on the above issues, high, long service life that the present invention provides a kind of detection accuracy and it is suitable for outdoor charging pile
Etc. equipment electric pole type water logging detection circuit and water sensor.
To achieve the above object, present invention employs following technical solutions:
The first aspect of the invention provides a kind of electric pole type water logging detection circuit, comprising:
First electrode signal input unit is used to convert amplification received first pwm signal of input terminal, and through output end
Couple first electrode；
Second electrode signal input unit is used to convert amplification received second pwm signal of input terminal, and through output end
Couple second electrode；
Comparing unit, first input end couple first electrode, and the second input terminal couples reference voltage signal, for comparing
The voltage of first electrode and the reference voltage signal；
And signal output unit, input terminal couple the output end of the comparing unit, for converting zoom comparison list
The output signal of member is simultaneously exported as detection signal；
Wherein, the first electrode signal input unit and second electrode signal input unit are output to the PWM on electrode
Signal period and pulsewidth are identical, and phase sequence differs 180 degree, and signal dutyfactor D≤5%.
Further, the first electrode signal input unit includes resistance R1-R3 and metal-oxide-semiconductor Q1；Wherein metal-oxide-semiconductor Q1
Drain electrode coupling first electrode, and 9V voltage source is coupled through resistance R3, grid couples the first pwm signal source through resistance R1, and through electricity
It hinders R2 and couples source electrode, source electrode ground connection；
The second electrode signal input unit includes resistance R4-R6 and metal-oxide-semiconductor Q2；The wherein drain electrode coupling of metal-oxide-semiconductor Q2
Second electrode, and 9V voltage source is coupled through resistance R6, grid couples the second pwm signal source through resistance R4, and couples through resistance R5
Source electrode, source electrode ground connection.
Further, the comparing unit includes comparator U1 and resistance R7, R8；The wherein power end coupling of comparator U1
9V voltage source, reverse side couple first electrode, and in-phase end couples reference voltage source, couple 9V voltage source through resistance R7, and through electricity
R8 ground connection is hindered, output end couples the signal output unit.
Further, the signal output unit includes metal-oxide-semiconductor Q3, resistance R9-R11 and capacitor C1；Wherein resistance R9,
One end of R10 and capacitor C1 couple 9V voltage source, and the other end of resistance R9 couples the output end and metal-oxide-semiconductor Q3 of the comparing unit
Source electrode, the grid of the other end coupling metal-oxide-semiconductor Q3 of resistance R10, the drain electrode of metal-oxide-semiconductor Q3 couples voltage source VCC through resistance R11,
And detection signal is exported as output end.
Further, which further includes electrode protection unit, and the electrode protection unit includes that transient electrical is constrained
Diode D1 and D2 processed, wherein the anode of diode D1 and D2 is opposite couples and is grounded, and cathode is respectively coupled to first electrode and the
Two electrodes.
The second aspect of the invention provides a kind of water sensor, including two electrodes, couple the electrode as
Electric pole type water logging detection circuit described in above-mentioned first aspect, further includes:
Signal generating circuit is used to generate first pwm signal and the second pwm signal.
Preferably, the signal generating circuit includes the integrated MCU and its peripheral circuit of SOP8 encapsulation.
Further, the water sensor further include:
Power circuit, including identical and mutually independent the first DCDC transformation reduction voltage circuit of structure and the 2nd DCDC transformation drop
Volt circuit, the first DCDC transformation reduction voltage circuit is for providing stable 9.0V voltage, the 2nd DCDC transformation decompression electricity
Road is for providing stable 3.3V voltage.
Further, the first DCDC transformation reduction voltage circuit includes resistance R13-R19, capacitor C2-C11, DCDC chip
U2 and inductance L1；Wherein, the VIN foot of DCDC chip U2 couples input power VDDIN, and is grounded through capacitor C2, C3, C4；EN foot
VIN foot is coupled through resistance R13, and is grounded through resistance R14；RT foot is grounded through resistance R15；One end of BOOT foot coupling capacitance C5,
One end of the other end of PH foot and capacitor C5 coupling inductance L1；COMP foot the resistance R16 through concatenating, capacitor C11, Yi Ji electricity respectively
Hold C10 ground connection；GND foot ground connection；The other end of inductance L1 resistance R17, R18, R19 through capacitor C6, C7, C8 and concatenation respectively
Ground connection, and as power output end；Capacitor C9 is connected to the both ends resistance R19.
Further, the power circuit further include conditioning protection circuit, the conditioning protection circuit include diode D3,
Fuse F1, varistor R12 and antisurge TVS pipe D4；Wherein, the anode coupling external power supply of diode D3, cathode coupling
It is used as output end output voltage VDDIN after fuse F1, and is grounded respectively through varistor R12 and antisurge TVS pipe D4.
Beneficial effects of the present invention:
Electric pole type water logging detection circuit of the invention and water sensor, by two electrodes apply the signal period and
Pulsewidth is identical and the pwm signal of phase sequence difference 180 degree has so that the positive negative direction cross-current of electric current on water logging test electrode is dynamic
Prevent to effect the oxidation of electrode.Meanwhile duty ratio D≤5% of the pwm signal on electrode is output to through metal-oxide-semiconductor drive amplification,
The power consumption of equipment and the detection accuracy of circuit can be effectively reduced.It is exported in addition, being compared by rationally setting with result
Circuit realizes wider relatively monitoring capability；By setting comparison threshold value, the water logging prison in the case of low TDS may be implemented
Alert capability is surveyed, to meet the monitoring capability that the rainy water of outdoor conditions immerses.Finally, in view of in the equipment such as outdoor charging pile
Portion environment is complicated, in order to prevent the uncertain complex electromagnetic environment such as electrostatic, circuit configuration of the invention electrode protection electricity
Road, power supply circuit, level translation circuit etc., farthest improve the anti-interference ability of circuit, to improve electricity
The stability on road.
Detailed description of the invention
Fig. 1 is the unit composition and connection relationship diagram of electric pole type water logging detection circuit of the invention.
Fig. 2 is the circuit diagram of electric pole type water logging detection circuit embodiment of the invention.
Fig. 3 is the circuit diagram of power circuit in water sensor embodiment of the invention.
Specific embodiment
For a further understanding of the present invention, the preferred embodiment of the invention is described below with reference to embodiment, still
It should be appreciated that these descriptions are only further explanation the features and advantages of the present invention, rather than to the claims in the present invention
Limitation.
Embodiment 1
One embodiment of the invention provides a kind of electric pole type water logging detection circuit, as shown in Figure 1, comprising:
First electrode signal input unit is used to convert amplification received first pwm signal of input terminal, and through output end
Couple first electrode；
Second electrode signal input unit is used to convert amplification received second pwm signal of input terminal, and through output end
Couple second electrode；
Comparing unit, first input end couple first electrode, and the second input terminal couples reference voltage signal, for comparing
The voltage of first electrode and the reference voltage signal；
And signal output unit, input terminal couple the output end of the comparing unit, for converting zoom comparison list
The output signal of member is simultaneously exported as detection signal；
Wherein, first electrode signal input unit and second electrode signal input unit are output to the pwm signal on electrode
Period and pulsewidth are identical, and phase sequence differs 180 degree, and signal dutyfactor D≤5%.
Preferred embodiment shown in 2 makees into one the electric pole type water logging detection circuit in the present embodiment with reference to the accompanying drawing
Walk explanation.
As shown in Fig. 2, first electrode signal input unit includes resistance R1-R3 and metal-oxide-semiconductor Q1 in the present embodiment；Wherein
The drain electrode of metal-oxide-semiconductor Q1 couples first electrode, and couples 9V voltage source through resistance R3, and grid couples the first pwm signal through resistance R1
Source, and source electrode, source electrode ground connection are coupled through resistance R2；
Second electrode signal input unit includes resistance R4-R6 and metal-oxide-semiconductor Q2；The wherein drain electrode coupling second of metal-oxide-semiconductor Q2
Electrode, and 9V voltage source is coupled through resistance R6, grid couples the second pwm signal source through resistance R4, and couples source electrode through resistance R5,
Source electrode ground connection.
Comparing unit includes comparator U1 and resistance R7, R8；Wherein the power end of comparator U1 couples 9V voltage source, reverse phase
End coupling first electrode, in-phase end couple reference voltage source, couple 9V voltage source through resistance R7, and be grounded through resistance R8, export
End couples the signal output unit.
Signal output unit includes metal-oxide-semiconductor Q3, resistance R9-R11 and capacitor C1；Wherein the one of resistance R9, R10 and capacitor C1
End coupling 9V voltage source, the other end of resistance R9 couple the output end of the comparing unit and the source electrode of metal-oxide-semiconductor Q3, resistance R10
Other end coupling metal-oxide-semiconductor Q3 grid, the drain electrode of metal-oxide-semiconductor Q3 couples voltage source VCC through resistance R11, and defeated as output end
Signal is detected out.
Embodiment as a further preference, the detection circuit in the present embodiment further includes electrode protection unit, the electricity
Pole protection location includes transient voltage suppressor D1 and D2, and wherein the anode of diode D1 and D2 is opposite couples and be grounded,
Cathode is respectively coupled to first electrode and second electrode.
The working principle of the circuit is as follows: first electrode and second electrode are received single-chip microcontroller and are exported using push-pull output mode
Fixed two groups of the pwm pulse signals PWM1 and PWM2 of duty ratio, which is 1S, duty ratio 95%, two group pulses
Signal phase differs 180 degree.PWM1 export high level when, after the current limliting of R1 resistance, driving metal-oxide-semiconductor Q1 conducting, PWMC1
End is pulled low as low level state, i.e. PWM1 input high level, corresponding PWMC1 output low level；PWM1 input low level, it is corresponding
PWMC1 exports high level.Thus, PWMC1 and PWMC2 are the pulse signals of one group of phase phase difference 180 degree, due to metal-oxide-semiconductor
The drain electrode of Q1, Q2 are all 9V voltage, thus PWMC1 and PWMC2 signal be amplitude be 9V, duty ratio 5%, phase phase difference 180 degree
Pulse train.The pulse train is applied on electrode catheter, and in the case where meeting water conduction, current direction is alternating direction
Flowing reduces since current unipolar flows to, caused by water body electrolyte ionize, and then probe is caused to aoxidize.Transient electrical is constrained
Diode (TVS) D1, D2 processed are responsible for absorbing the electrostatic and surging signal on probe.R7 and R8 forms resistor voltage divider circuit, makes Vst
Locate basic threshold voltage signal of the voltage clamping in 8.18V as comparator U1.In the case where probe is not in contact with water quality situation, PWMC1
Signal amplitude 9V, after comparator, the voltage signal on comparator U1 output pin is the pulse signal that duty ratio is 95%.
And if there is PWMC1 and PWMC2 is connected in conductive water quality, the voltage of that PWMC1 can be reduced as water quality TDS value increases,
When PWMC1 voltage signal is pulled down to a certain degree, the output pin of comparator U1 exports high level completely.R10, R11 and
Q3 forms level shifting circuit module, and when the output pin of comparator U1 exports high level 9V, Q3 does not work, in drain electrode
TEST_OUT output amplitude is the voltage signal of 3.3V；When the output pin of U1 exports low level 0V, Q3 work, drain electrode
Upper TEST_OUT output amplitude is lower than the low level signal of 0.5V.So that subsequent single-chip microcontroller passes through the electricity for judging TEST_OUT signal
Flat characteristic can judge the water for whether being greater than a threshold value at probe with the presence of TDS value, to finally judge whether have
Immersion happens.
Embodiment 2
Second embodiment of the invention provides a kind of water sensor, including two electrodes, couples the as above of electrode
State electric pole type water logging detection circuit described in one embodiment, further includes:
Signal generating circuit is used to generate first pwm signal and the second pwm signal；
And power circuit, become including identical and mutually independent the first DCDC transformation reduction voltage circuit of structure and the 2nd DCDC
Reduction voltage circuit is changed, wherein the first DCDC transformation reduction voltage circuit is used to provide stable 9.0V voltage, for rear class flood monitoring circuit
Work and state instruction output；2nd DCDC transformation reduction voltage circuit is steady for the part rear class MCU for providing stable 3.3V voltage
Determine reliably working.
Preferably, in the present embodiment, signal generating circuit includes integrated MCU and its periphery of SOP8 encapsulation
Circuit, few with peripheral circuit, program is loaded into debugging conveniently, stable, good in economic efficiency advantage.
Preferably, as shown in figure 3, in the present embodiment, it includes resistance that the first DCDC, which converts reduction voltage circuit,
R13-R19, capacitor C2-C11, DCDC chip U2 and inductance L1；Wherein, the VIN foot of DCDC chip U2 couples input power
VDDIN, and be grounded through capacitor C2, C3, C4；EN foot couples VIN foot through resistance R13, and is grounded through resistance R14；RT foot is through resistance
R15 ground connection；One end of the other end coupling inductance L1 of one end of BOOT foot coupling capacitance C5, PH foot and capacitor C5；COMP foot point
Resistance R16, capacitor C11 and capacitor C10 ground connection not through concatenating；GND foot ground connection；The other end of inductance L1 is respectively through capacitor
C6, C7, C8 and resistance R17, R18, R19 of concatenation ground connection, and DVDD9.0V voltage is exported as power output end；Capacitor C9
It is connected to the both ends resistance R19.
The structure of the 2nd DCDC transformation reduction voltage circuit and the first DCDC transformation reduction voltage circuit are identical in the present embodiment, defeated
Outlet exports VCC3.3V voltage, and this will not be repeated here.
Embodiment as a further preference, in the present embodiment, power circuit further includes conditioning protection circuit, the conditioning
Protection circuit includes diode D3, fuse F1, varistor R12 and antisurge TVS pipe D4；Wherein, the anode of diode D3
Couple external power supply, cathode is used as output end output voltage VDDIN after coupling fuse F1, and respectively through varistor R12 and
Antisurge TVS pipe D4 ground connection.
In the present embodiment, the first DCDC converts reduction voltage circuit and the 2nd DCDC transformation reduction voltage circuit uses single-point grounding, together
When accomplish independence as far as possible on circuit layout and route cabling, reduce interfering with each other from power ground to greatest extent, from
And effectively improve the anti-interference ability of circuit.Wherein diode D3, fuse F1, varistor R12 and antisurge TVS pipe
D4 constitutes the conditioning protection circuit of input power part.Wherein, D3 effect is anti-reverse diode, guarantees that power input is positive and negative
When mistake, circuit is not damaged；F1 self-recovery fuse is used to provide the instantaneous protection in reasons such as late-class circuit instantaneous short-circuits；
R12 and D4 constitutes surge protection circuit, and conducting collocation quickly and at a slow speed effectively protects surge impact when occurring to circuit
Influence.DCDC chip U2 is the high efficiency synchronous DCDC with functions such as over-voltage, under-voltage, overcurrent, overheating protection and soft starts
Conversion chip, wherein VIN is the high input voltage of chip, and VSENSE is the feed back input of chip, and EN is the enabled and starting of chip
Control input, COMP are that the external compensation of chip inputs, and PH is that the DCDC of chip converts output.
The above description of the embodiment is only used to help understand the method for the present invention and its core ideas.It should be pointed out that pair
For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out
Some improvements and modifications, these improvements and modifications also fall within the scope of protection of the claims of the present invention.
Claims (10)
1. a kind of electric pole type water logging detection circuit characterized by comprising
First electrode signal input unit is used to convert amplification received first pwm signal of input terminal, and couples through output end
First electrode；
Second electrode signal input unit is used to convert amplification received second pwm signal of input terminal, and couples through output end
Second electrode；
Comparing unit, first input end couple first electrode, and the second input terminal couples reference voltage signal, for comparing first
The voltage of electrode and the reference voltage signal；
And signal output unit, input terminal couple the output end of the comparing unit, for converting zoom comparison unit
Output signal is simultaneously exported as detection signal；
Wherein, the first electrode signal input unit and second electrode signal input unit are output to the pwm signal on electrode
Period and pulsewidth are identical, and phase sequence differs 180 degree, and signal dutyfactor D≤5%.
2. electric pole type water logging detection circuit as described in claim 1, which is characterized in that the first electrode signal input unit
Including resistance R1-R3 and metal-oxide-semiconductor Q1；Wherein the drain electrode of metal-oxide-semiconductor Q1 couples first electrode, and couples 9V voltage source through resistance R3,
Grid couples the first pwm signal source through resistance R1, and couples source electrode, source electrode ground connection through resistance R2；
The second electrode signal input unit includes resistance R4-R6 and metal-oxide-semiconductor Q2；The wherein drain electrode coupling second of metal-oxide-semiconductor Q2
Electrode, and 9V voltage source is coupled through resistance R6, grid couples the second pwm signal source through resistance R4, and couples source electrode through resistance R5,
Source electrode ground connection.
3. electric pole type water logging detection circuit as described in claim 1, which is characterized in that the comparing unit includes comparator U1
With resistance R7, R8；Wherein the power end of comparator U1 couples 9V voltage source, and reverse side couples first electrode, in-phase end coupling ginseng
Voltage source is examined, couples 9V voltage source through resistance R7, and be grounded through resistance R8, output end couples the signal output unit.
4. electric pole type water logging detection circuit as described in claim 1, which is characterized in that the signal output unit includes MOS
Pipe Q3, resistance R9-R11 and capacitor C1；Wherein one end of resistance R9, R10 and capacitor C1 couple 9V voltage source, and resistance R9's is another
End couples the output end of the comparing unit and the source electrode of metal-oxide-semiconductor Q3, and the other end of resistance R10 couples the grid of metal-oxide-semiconductor Q3,
The drain electrode of metal-oxide-semiconductor Q3 couples voltage source VCC through resistance R11, and exports detection signal as output end.
5. electric pole type water logging detection circuit according to any one of claims 1-4, which is characterized in that further include electrode protection list
Member, the electrode protection unit include transient voltage suppressor D1 and D2, wherein the opposite coupling of the anode of diode D1 and D2
It connects and is grounded, cathode is respectively coupled to first electrode and second electrode.
6. a kind of water sensor, which is characterized in that including two electrodes, couple the electrode as claim 1-5 is any
Electric pole type water logging detection circuit described in, further includes:
Signal generating circuit is used to generate first pwm signal and the second pwm signal.
7. water sensor as claimed in claim 6, which is characterized in that the signal generating circuit includes the collection of SOP8 encapsulation
At MCU and its peripheral circuit.
8. water sensor as claimed in claims 6 or 7, which is characterized in that further include:
Power circuit, including identical and mutually independent the first DCDC transformation reduction voltage circuit of structure and the 2nd DCDC transformation decompression electricity
Road, the first DCDC transformation reduction voltage circuit are used for providing stable 9.0V voltage, the 2nd DCDC transformation reduction voltage circuit
In the 3.3V voltage that offer is stable.
9. water sensor as claimed in claim 8, which is characterized in that the first DCDC transformation reduction voltage circuit includes resistance
R13-R19, capacitor C2-C11, DCDC chip U2 and inductance L1；Wherein, the VIN foot of DCDC chip U2 couples input power
VDDIN, and be grounded through capacitor C2, C3, C4；EN foot couples VIN foot through resistance R13, and is grounded through resistance R14；RT foot is through resistance
R15 ground connection；One end of the other end coupling inductance L1 of one end of BOOT foot coupling capacitance C5, PH foot and capacitor C5；COMP foot point
Resistance R16, capacitor C11 and capacitor C10 ground connection not through concatenating；GND foot ground connection；The other end of inductance L1 is respectively through capacitor
C6, C7, C8 and resistance R17, R18, R19 of concatenation ground connection, and as power output end；Capacitor C9 is connected to resistance R19 two
End.
10. water sensor as claimed in claim 8, which is characterized in that the power circuit further includes conditioning protection circuit,
The conditioning protection circuit includes diode D3, fuse F1, varistor R12 and antisurge TVS pipe D4；Wherein, diode
The anode coupling external power supply of D3, cathode are used as output end output voltage VDDIN after coupling fuse F1, and respectively through pressure-sensitive electricity
Hinder R12 and antisurge TVS pipe D4 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910716928.2A CN110346015B (en) | 2019-08-05 | 2019-08-05 | Electrode type water immersion detection circuit and water immersion sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910716928.2A CN110346015B (en) | 2019-08-05 | 2019-08-05 | Electrode type water immersion detection circuit and water immersion sensor |
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Cited By (2)
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| CN117311229A (en) * | 2023-10-23 | 2023-12-29 | 国网河北省电力有限公司雄安新区供电公司 | Intelligent micro-control system for water immersion sensor and control method thereof |
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| CN110346015B (en) | 2024-05-28 |
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