CN207180808U - Probe water level detecting system based on variable-frequency pulse signal - Google Patents
Probe water level detecting system based on variable-frequency pulse signal Download PDFInfo
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- CN207180808U CN207180808U CN201721014458.8U CN201721014458U CN207180808U CN 207180808 U CN207180808 U CN 207180808U CN 201721014458 U CN201721014458 U CN 201721014458U CN 207180808 U CN207180808 U CN 207180808U
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Abstract
The utility model belongs to water level detecting technical field, there is provided a kind of probe water level detecting system based on variable-frequency pulse signal.The system includes CPU, pulse signal isolation circuit, pulse amplifying circuit, pulse circuit and forms circuit, signal anti-jamming circuit, signal amplification circuit, signal photoelectric isolating circuit, current rectifying and wave filtering circuit and mu balanced circuit, CPU, pulse signal isolation circuit, pulse amplifying circuit, pulse circuit form circuit, signal anti-jamming circuit, signal amplification circuit and signal photoelectric isolating circuit and are sequentially connected, and CPU is also connected with signal photoelectric isolating circuit.Probe water level detecting system of the utility model based on variable-frequency pulse signal, it can solve the problem that the problem of electromagnetism interference, poor performance and probe are easily by electrolytic oxidation, prevent probe to be electrolysed and polluted water, avoid the phenomenon of broken by lightning CPU and product circuit, reduce system cost and frequency of maintenance.
Description
Technical field
It the utility model is related to water level detecting technical field, and in particular to a kind of probe water level based on variable-frequency pulse signal
Detecting system.
Background technology
At present, done using probe in the product of water level detecting, water level detection circuit mainly there are three kinds：
The first：Mainly by, to low probe direct current supply, after probe signal is by Phototube Coupling, being defeated by after rectifying and wave-filtering
Controller CPU makees logic analysis, judges water level in water pool, and then control the probe water level detection circuit of water pump.
Second：Signal is supplied to public probe mainly in a manner of fixed pulse, signal passes through attenuator circuit and pressure limiting
After current-limiting circuit processing, it is defeated by controller CPU and makees logic analysis, judge water level in water pool, and then controls the probe water level inspection of water pump
Slowdown monitoring circuit.
The third：Mainly water is done with one group of low-voltage alternating-current fixed frequency 50Hz power supply completely isolated with other circuits
Position measure loop power supply, after probe signal is by Phototube Coupling, is defeated by controller CPU and makees logic analysis, judge water level in water pool, enter
And control the probe water level detection circuit of water pump.
But in actual application, there is many drawbacks in above-mentioned three kinds of circuits：
The first probe water level detection circuit：Because control signal is low-voltage DC supply, so it makees to probe electrolysis
With very greatly, so as to polluted water, easy oxidation of popping one's head in is caused.Simultaneously as control signal is low-voltage DC, electric charge can be produced
Accumulation, and then cause electrostatic breakdown circuit element.
Second of probe water level detection circuit：Although the first probe water level detection circuit point can be solved the problems, such as,
It is not separate probe circuit and other circuits due to independently-powered, the CPU of controller is common ground with probe, in Special Ring
In border, system is easily interfered.When not using the introducing of the forceful electric power such as Phototube Coupling, thunderbolt due to signal, the big face of circuit can be caused
Product damage, maintenance cost are higher.
The third probe water level detection circuit：Although second of probe water level detection circuit point can be solved the problems, such as, adopt
Water level detecting loop power supply is done with isolation exchange fixed frequency 50Hz power supplys, still, due to fixed 50Hz frequencies, system is altogether
It is vulnerable to interference in frequency environment, and is not easy to solve, signal propagation distance can only meets certain customers' demand.In view of long-distance transmissions
Application demand, signal voltage is often designed to higher, easy electrolytic oxidation of being popped one's head in when causing closely to use, electric energy loss wave
Take larger.
How to solve the problems, such as that electromagnetism interference, poor performance and probe easily by electrolytic oxidation, prevent probe to be electrolysed and pollute
Water quality, the phenomenon of broken by lightning CPU and product circuit is avoided, reduce system cost and frequency of maintenance, be those skilled in the art
The problem of urgent need to resolve.
Utility model content
The utility model is intended to one of technical problem at least solving in correlation technique to a certain extent.
Therefore, the first purpose of the present utility model is to propose a kind of probe water level detecting system based on variable-frequency pulse signal
System, concrete technical scheme are as follows：
The utility model provides a kind of probe water level detecting system based on variable-frequency pulse signal, should be believed based on variable-frequency pulse
Number probe water level detecting system include CPU, pulse signal isolation circuit, pulse amplifying circuit, pulse circuit formed circuit, letter
Number anti-jamming circuit, signal amplification circuit, signal photoelectric isolating circuit, current rectifying and wave filtering circuit and mu balanced circuit, CPU, pulse letter
Number isolation circuit, pulse amplifying circuit, pulse circuit form circuit, signal anti-jamming circuit, signal amplification circuit and flashlight
Electric isolating circuit is sequentially connected, and CPU is also connected with signal photoelectric isolating circuit, and current rectifying and wave filtering circuit is also electric with pulse amplifying respectively
Road is connected with mu balanced circuit, and mu balanced circuit is also connected with signal photoelectric isolating circuit and CPU, the spy that pulse circuit is formed in circuit
Head is located at water level region to be detected.
Further, pulse signal isolation circuit includes the first current-limiting resistance (R1) and the first optocoupler being sequentially connected
(OC1), the first current-limiting resistance (R1) is also connected with CPU PWM pins.
Further, pulse amplifying circuit include second resistance (R2), 3rd resistor (R3), the 4th load resistance (R4),
5th load resistance (R5), the first triode (Q1) and the second triode (Q2), first end and the first light of second resistance (R2)
The colelctor electrode connection of coupling (OC1), the second end of second resistance (R2) first end with 3rd resistor (R3) and the two or three pole respectively
The colelctor electrode connection of (Q2) is managed, the second end of 3rd resistor (R3) is connected with the base stage of the second triode (Q2), the 4th load electricity
Resistance (R4) is connected with the base stage of the second triode (Q2) and the colelctor electrode of the first triode (Q1) respectively, the 5th load resistance (R5)
It is connected with the base stage of the first triode (Q1), the emitter stage of the base stage of the first triode (Q1) also with the first optocoupler (OC1) is connected.
Further, pulse circuit formed circuit include the 7th current-limiting resistance (R7), low water level probe, middle water-level probe,
High water level probe, the 8th current-limiting resistance (R8) and the 9th current-limiting resistance (R9), the 7th current-limiting resistance (R7) respectively with the two or three pole
Manage emitter stage and the low water level probe connection of (Q2), middle water-level probe be connected with the 8th current-limiting resistance (R8), high water level pop one's head in and
9th current-limiting resistance (R9) is connected, and low water level probe, middle water-level probe and high water level probe are sequentially distributed in water level from bottom to top
Region to be detected.
Further, signal anti-jamming circuit includes the 7th electric capacity (C7) and the 8th electric capacity (C8) that are sequentially connected, and the 7th
Electric capacity (C7) is also connected with the 8th current-limiting resistance (R8), and the 8th electric capacity (C8) is also connected with the 9th current-limiting resistance (R9).
Further, signal amplification circuit includes the tenth load resistance (R10), the 11st load resistance (R11), the three or three
Pole pipe (Q3) and the 4th triode (Q4), the first end of the tenth load resistance (R10) are connected with the base stage of the 3rd triode (Q3),
Second end of the tenth load resistance (R10) is connected with the emitter stage of the 3rd triode (Q3), the both ends of the tenth load resistance (R10)
Both ends also respectively with the 7th electric capacity (C7) are connected, first end and the 4th triode (Q4) of the 11st load resistance (R11)
Base stage is connected, and the second end of the 11st load resistance (R11) is connected with the emitter stage of the 4th triode (Q4), the 11st load electricity
Both ends of the both ends of (R11) also respectively with the 8th electric capacity (C8) are hindered to be connected.
Further, signal photoelectric isolating circuit includes the second optocoupler (OC2) and the 3rd optocoupler (OC3), the second optocoupler
(OC2) the WATER1 pins respectively with the 3rd triode (Q3) and CPU are connected, the 3rd optocoupler (OC3) respectively with the 4th triode
(Q4) connected with CPU WATER2 pins.
Further, current rectifying and wave filtering circuit includes terminal (J1), the first rectifier bridge (BR1), the first electric capacity (C1), the second electricity
Hold (C2), the second rectifier bridge (BR2), the 3rd electric capacity (C3) and the 4th electric capacity (C4), terminal (J1), the first rectifier bridge (BR1) and
First electric capacity (C1) is sequentially connected, and the first rectifier bridge (BR1) is also connected with the second electric capacity (C2), the first end of the second electric capacity (C2)
It is connected with the colelctor electrode of the second triode (Q2), the second end of the second electric capacity (C2) connects with the emitter stage of the first triode (Q1)
Connect, terminal (J1), the second rectifier bridge (BR2) and the 3rd electric capacity (C3) are sequentially connected, the second rectifier bridge (BR2) also with the 4th electric capacity
(C4) connect, the second rectifier bridge (BR2) is also connected with mu balanced circuit.
Further, mu balanced circuit includes voltage-stablizer (U1), the 5th electric capacity (C5) and the 6th electric capacity (C6), the second rectifier bridge
(BR2), voltage-stablizer (U1) and the 5th electric capacity (C5) are sequentially connected, and voltage-stablizer (U1) is also connected with the 6th electric capacity (C6), voltage-stablizer
(U1) also it is connected respectively with the second optocoupler (OC2), the 3rd optocoupler (OC3) and CPU.
Further, terminal (J1) is also connected with transformer or Switching Power Supply.
The probe water level detecting system based on variable-frequency pulse signal that the present embodiment provides, it is complete with other circuits with one group
The power supply of isolation, it is system power supply by independent current rectifying and wave filtering circuit, CPU adjustment sends variable-frequency pulse signal, through isolating, amplifying
Regeneration pulse signal is formed, water level detecting signal is done by regeneration pulse and fed back, the characteristic conductive according to water, probe is connected and is formed
Pulse circuit, pulse feedback letter is received by signal anti-jamming circuit, signal amplification circuit, signal photoelectric isolating circuit, CPU
Number, by logical calculated, judge the distance of water level detecting point distance, so as to the optimum pulse frequency that adjust automatically is sent, realize
Power consumption is lower, and propagation distance is farther, and probe be electrolysed and not oxidizable, makes probe service life longer, and CPU passes through itself hair
The pulse number for sending and receiving carries out logic check and correction, and can cleverly jump interference source frequency, realize that antijamming capability is stronger.
Therefore, probe water level detecting system of the present embodiment based on variable-frequency pulse signal, electromagnetism interference, property be can solve the problem that
The problem of can be poor and popping one's head in easily by electrolytic oxidation, prevent probe to be electrolysed and polluted water, avoid broken by lightning CPU and product circuit
Phenomenon, reduce system cost and frequency of maintenance.
Brief description of the drawings
, below will be right in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art.In all of the figs, it is similar
Element or part are typically identified by similar reference.In accompanying drawing, each element or part might not be according to the ratios of reality
Draw.
Fig. 1 shows a kind of knot of probe water level detecting system based on variable-frequency pulse signal provided by the utility model
Structure schematic diagram；
Fig. 2 shows the circuit connection diagram of pulse signal isolation circuit provided by the utility model；
Fig. 3 shows the circuit connection diagram of pulse amplifying circuit provided by the utility model；
Fig. 4 shows that pulse circuit provided by the utility model forms circuit and connected with the circuit of signal anti-jamming circuit
Figure；
Fig. 5 shows the circuit connection diagram of signal amplification circuit provided by the utility model；
Fig. 6 shows the circuit connection diagram of signal photoelectric isolating circuit provided by the utility model；
Fig. 7 shows the circuit connection diagram of current rectifying and wave filtering circuit provided by the utility model；
Fig. 8 shows the circuit connection diagram of mu balanced circuit provided by the utility model.
Embodiment
The embodiment of technical solutions of the utility model is described in detail below in conjunction with accompanying drawing.Following examples are only
For clearly illustrating the technical solution of the utility model, therefore example is intended only as, and this reality can not be limited with this
With new protection domain.
It should be noted that unless otherwise indicated, technical term or scientific terminology used in this application should be this reality
The ordinary meaning understood with new one of ordinary skill in the art.
A kind of probe water level detecting system based on variable-frequency pulse signal that the utility model embodiment is provided, with reference to figure
1, being somebody's turn to do the probe water level detecting system based on variable-frequency pulse signal includes CPU, pulse signal isolation circuit 1, pulse amplifying circuit
2nd, pulse circuit forms circuit 3, signal anti-jamming circuit 4, signal amplification circuit 5, signal photoelectric isolating circuit 6, rectifying and wave-filtering
Circuit 7 and mu balanced circuit 8, CPU, pulse signal isolation circuit 1, pulse amplifying circuit 2, pulse circuit form circuit 3, signal resists
Interference circuit 4, signal amplification circuit 5 and signal photoelectric isolating circuit 6 are sequentially connected, and CPU also connects with signal photoelectric isolating circuit 6
Connect, current rectifying and wave filtering circuit 7 is also connected with pulse amplifying circuit 2 and mu balanced circuit 8 respectively, mu balanced circuit 8 also with signal photoelectricity every
Connected from circuit 6 with CPU, the probe that pulse circuit is formed in circuit 3 is located at water level region to be detected.
The probe water level detecting system based on variable-frequency pulse signal that the present embodiment provides, it is complete with other circuits with one group
The power supply of isolation, it is system power supply by independent current rectifying and wave filtering circuit 7, CPU adjustment sends variable-frequency pulse signal, through isolating, putting
It is big to form regeneration pulse signal, water level detecting signal is done by regeneration pulse and fed back, the characteristic conductive according to water, connects probe shape
Into pulse circuit, by signal anti-jamming circuit 4, signal amplification circuit 5, signal photoelectric isolating circuit 6, it is anti-that CPU receives pulse
Feedback signal, by logical calculated, judge the distance of water level detecting point distance, so as to the optimum pulse frequency that adjust automatically is sent,
Realize that power consumption is lower, propagation distance is farther, and probe be electrolysed and not oxidizable, makes probe service life longer, and CPU passes through oneself
The pulse number that body sends and receives carries out logic check and correction, and can cleverly jump interference source frequency, realize antijamming capability more
By force.
Therefore, probe water level detecting system of the present embodiment based on variable-frequency pulse signal, electromagnetism interference, property be can solve the problem that
The problem of can be poor and popping one's head in easily by electrolytic oxidation, prevent probe to be electrolysed and polluted water, avoid broken by lightning CPU and product circuit
Phenomenon, reduce system cost and frequency of maintenance.
Specifically, in terms of the realization of pulse signal isolation circuit, with reference to Fig. 2, pulse signal isolation circuit 1 is included successively
The first current-limiting resistance (R1) and the first optocoupler (OC1) of connection, the first current-limiting resistance (R1) are also connected with CPU PWM pins.
Here, CPU is compiled by program, and signal feedback, logical calculated, adjust automatically transmission variable-frequency pulse signal.Pulse
Signal isolation circuit 1 receives the variable-frequency pulse signal that CPU is sent, real using the first current-limiting resistance (R1) and the first optocoupler (OC1)
Existing photoelectricity segmentation.
Specifically, in terms of the realization of pulse amplifying circuit, with reference to Fig. 3, pulse amplifying circuit 2 includes second resistance
(R2), 3rd resistor (R3), the 4th load resistance (R4), the 5th load resistance (R5), the first triode (Q1) and the two or three pole
Manage (Q2), the first end of second resistance (R2) is connected with the colelctor electrode of the first optocoupler (OC1), the second end point of second resistance (R2)
It is not connected with the first end of 3rd resistor (R3) and the colelctor electrode of the second triode (Q2), the second end of 3rd resistor (R3) and the
The base stage connection of two triodes (Q2), the 4th load resistance (R4) base stage and the first triode with the second triode (Q2) respectively
(Q1) colelctor electrode connection, the 5th load resistance (R5) are connected with the base stage of the first triode (Q1), the first triode (Q1)
Emitter stage of the base stage also with the first optocoupler (OC1) is connected.
Here, pulse amplifying circuit 2 receives the variable-frequency pulse signal of Phototube Coupling, acted on by the 5th load resistance (R5)
The triode of pulse first (Q1), the triode of pulse second (Q2) is acted on by the 4th load resistance (R4), realize that pulse regneration is believed
Number corresponding amplification.
Specifically, in terms of pulse circuit forms the realization of circuit, with reference to Fig. 4, pulse circuit, which forms circuit 3, includes the 7th
Current-limiting resistance (R7), low water level probe, middle water-level probe, high water level probe, the 8th current-limiting resistance (R8) and the 9th current-limiting resistance
(R9), the 7th current-limiting resistance (R7) is popped one's head in the emitter stage and low water level of the second triode (Q2) connect respectively, middle water-level probe
It is connected with the 8th current-limiting resistance (R8), high water level probe is connected with the 9th current-limiting resistance (R9), low water level probe, middle water-level probe
It is sequentially distributed from bottom to top in water level region to be detected with high water level probe.
Here, pulse shaping loop receives the pulse signal after amplification, visited through the 7th current-limiting resistance (R7) access low water level
Head, conductive media is done by water, water-level probe or high water level pop one's head in form loop in connection.
Specifically, in terms of the realization of signal anti-jamming circuit, with reference to Fig. 4, signal anti-jamming circuit 4 includes being sequentially connected
The 7th electric capacity (C7) and the 8th electric capacity (C8), the 7th electric capacity (C7) is also connected with the 8th current-limiting resistance (R8), the 8th electric capacity
(C8) also it is connected with the 9th current-limiting resistance (R9).
Here, the pulse number that signal anti-jamming circuit 4 (6) can send and receive to CPU carries out logic analysis judgement
Particular surroundings electromagnetic interference frequency is avoided in adjustment, jump.In actual application, the 7th electric capacity (C7) and the 8th electric capacity (C8)
It is lightning-arrest using the extremely low CBB electric capacity composition of dielectric loss.
Specifically, in terms of the realization of signal amplification circuit, with reference to Fig. 5, signal amplification circuit 5 includes the tenth load resistance
(R10), the 11st load resistance (R11), the 3rd triode (Q3) and the 4th triode (Q4), the tenth load resistance (R10)
First end is connected with the base stage of the 3rd triode (Q3), the second end and the 3rd triode (Q3) of the tenth load resistance (R10)
Emitter stage is connected, and the both ends of the both ends of the tenth load resistance (R10) also respectively with the 7th electric capacity (C7) be connecteds, and the 11st load is electric
The first end of resistance (R11) is connected with the base stage of the 4th triode (Q4), the second end and the four or three of the 11st load resistance (R11)
The emitter stage connection of pole pipe (Q4), the both ends of the both ends of the 11st load resistance (R11) also respectively with the 8th electric capacity (C8) are connected.
Here, in pulse signal connection during water level, the triode of pulse the 3rd is acted on by the tenth load resistance (R10)
(Q3) signal amplification is carried out, when pulse signal connects high water level, pulse the four or three is acted on by the 11st load resistance (R11)
Pole pipe (Q4) carries out signal amplification.
Specifically, in terms of the realization of signal photoelectric isolating circuit, with reference to Fig. 6, signal photoelectric isolating circuit 6 includes second
Optocoupler (OC2) and the 3rd optocoupler (OC3), the second optocoupler (OC2) connect with the 3rd triode (Q3) and CPU WATER1 pins respectively
Connect, WATER2 pin of the 3rd optocoupler (OC3) respectively with the 4th triode (Q4) and CPU is connected.
Here, the signal in the reception of signal photoelectric isolating circuit 6 after water level amplification, photoelectricity is carried out through the second optocoupler (OC2)
Segmentation, signal photoelectric isolating circuit 6 receive the signal after high water level amplification, and photoelectricity segmentation is carried out through the 3rd optocoupler (OC3).Reclaimed water
CPU WATER1 pin are connected after the signal Phototube Coupling of position, connect CPU WATER2 pin after high water level signal Phototube Coupling, CPU pairs
Logic decision and adjustment are done in pulse.
Specifically, in terms of the realization of current rectifying and wave filtering circuit, with reference to Fig. 7, current rectifying and wave filtering circuit 7 includes current rectifying and wave filtering circuit
Including terminal (J1), the first rectifier bridge (BR1), the first electric capacity (C1), the second electric capacity (C2), the second rectifier bridge (BR2), the 3rd electricity
Hold (C3) and the 4th electric capacity (C4), terminal (J1), the first rectifier bridge (BR1) and the first electric capacity (C1) are sequentially connected, the first rectification
Bridge (BR1) is also connected with the second electric capacity (C2), and the first end of the second electric capacity (C2) is connected with the colelctor electrode of the second triode (Q2),
Second end of the second electric capacity (C2) is connected with the emitter stage of the first triode (Q1), terminal (J1), the second rectifier bridge (BR2) and
Three electric capacity (C3) are sequentially connected, and the second rectifier bridge (BR2) is also connected with the 4th electric capacity (C4), the second rectifier bridge (BR2) also with surely
Volt circuit connects.Terminal (J1) is also connected with transformer or Switching Power Supply.
Here, industrial power supply accesses 4,5 pin of J1 terminals after being depressured by product transformer or Switching Power Supply, pass through first
Rectifier bridge (BR1) is rectified into low-voltage DC, and the first electric capacity (C1) and the second electric capacity (C2) filtering provide probe circuit independent electrical
Source.
Specifically, in terms of the realization of mu balanced circuit, with reference to Fig. 8, mu balanced circuit includes voltage-stablizer (U1), the 5th electric capacity
(C5) it is sequentially connected with the 6th electric capacity (C6), the second rectifier bridge (BR2), voltage-stablizer (U1) and the 5th electric capacity (C5), voltage-stablizer
(U1) also it is connected with the 6th electric capacity (C6), voltage-stablizer (U1) also connects with the second optocoupler (OC2), the 3rd optocoupler (OC3) and CPU respectively
Connect.Terminal (J1) is also connected with transformer or Switching Power Supply.
Here, industrial power supply accesses 1,2 pin of J1 terminals after being depressured by product transformer or Switching Power Supply, pass through second
Rectifier bridge (BR2) is rectified into low-voltage DC, and the 3rd electric capacity (C3), the filtering of the 4th electric capacity (C4) are supplied to voltage-stablizer (U1), turned
3.3V is changed to, is that optocoupler and CPU power.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present utility model.In this manual, to the schematic table of above-mentioned term
State and be necessarily directed to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be with
Combined in an appropriate manner in any one or more embodiments or example.In addition, in the case of not conflicting, this area
Technical staff the different embodiments or example and the feature of different embodiments or example described in this specification can be entered
Row combines and combination.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type, it all should cover among claim of the present utility model and the scope of specification.
Claims (10)
- A kind of 1. probe water level detecting system based on variable-frequency pulse signal, it is characterised in that including：CPU, pulse signal isolation circuit, pulse amplifying circuit, pulse circuit form circuit, signal anti-jamming circuit, signal and put Big circuit, signal photoelectric isolating circuit, current rectifying and wave filtering circuit and mu balanced circuit,The CPU, the pulse signal isolation circuit, the pulse amplifying circuit, the pulse circuit form circuit, the letter Number anti-jamming circuit, the signal amplification circuit and the signal photoelectric isolating circuit are sequentially connected,The CPU is also connected with the signal photoelectric isolating circuit,The current rectifying and wave filtering circuit is also connected with the pulse amplifying circuit and the mu balanced circuit respectively,The mu balanced circuit is also connected with the signal photoelectric isolating circuit and the CPU,The probe that the pulse circuit is formed in circuit is located at water level region to be detected.
- 2. the probe water level detecting system based on variable-frequency pulse signal according to claim 1, it is characterised in that the pulse Signal isolation circuit includes the first current-limiting resistance R1 and the first optocoupler OC1 being sequentially connected,The first current-limiting resistance R1 is also connected with the PWM pins of the CPU.
- 3. the probe water level detecting system based on variable-frequency pulse signal according to claim 2, it is characterised in that the pulse Amplifying circuit includes second resistance R2,3rd resistor R3, the 4th load resistance R4, the 5th load resistance R5, the first triode Q1 With the second triode Q2,The first end of the second resistance R2 is connected with the colelctor electrode of the first optocoupler OC1,The second end of the second resistance R2 respectively with the first end of the 3rd resistor R3 and the collection of the second triode Q2 Electrode connects,The second end of the 3rd resistor R3 is connected with the base stage of the second triode Q2,4th load resistance R4 is connected with the base stage of the second triode Q2 and the colelctor electrode of the first triode Q1 respectively,The 5th load resistance R5 is connected with the base stage of the first triode Q1,Emitter stage of the base stage of the first triode Q1 also with the first optocoupler OC1 is connected.
- 4. the probe water level detecting system based on variable-frequency pulse signal according to claim 3, it is characterised in that the pulse Loop, which forms circuit, includes the 7th current-limiting resistance R7, low water level probe, middle water-level probe, high water level probe, the 8th current-limiting resistance R8 and the 9th current-limiting resistance R9,The 7th current-limiting resistance R7 connects with the emitter stage of the second triode Q2 and low water level probe respectively,The middle water-level probe is connected with the 8th current-limiting resistance R8,The high water level probe is connected with the 9th current-limiting resistance R9,The low water level probe, the middle water-level probe and high water level probe are sequentially distributed to be detected in water level from bottom to top Region.
- 5. the probe water level detecting system based on variable-frequency pulse signal according to claim 4, it is characterised in that the signal Anti-jamming circuit includes the 7th electric capacity C7 and the 8th electric capacity C8 being sequentially connected,The 7th electric capacity C7 is also connected with the 8th current-limiting resistance R8,The 8th electric capacity C8 is also connected with the 9th current-limiting resistance R9.
- 6. the probe water level detecting system based on variable-frequency pulse signal according to claim 5, it is characterised in that the signal Amplifying circuit includes the tenth load resistance R10, the 11st load resistance R11, the 3rd triode Q3 and the 4th triode Q4,The first end of the tenth load resistance R10 is connected with the base stage of the 3rd triode Q3, the tenth load resistance R10 the second end is connected with the emitter stage of the 3rd triode Q3, the both ends of the tenth load resistance R10 also respectively with institute The 7th electric capacity C7 both ends connection is stated,The first end of the 11st load resistance R11 is connected with the base stage of the 4th triode Q4, the 11st load Resistance R11 the second end is connected with the emitter stage of the 4th triode Q4, and the both ends of the 11st load resistance R11 are also divided Both ends not with the 8th electric capacity C8 are connected.
- 7. the probe water level detecting system based on variable-frequency pulse signal according to claim 6, it is characterised in that the signal Photoelectric isolating circuit includes the second optocoupler OC2 and the 3rd optocoupler OC3,WATER1 pins of the second optocoupler OC2 respectively with the 3rd the triode Q3 and CPU is connected,WATER2 pins of the 3rd optocoupler OC3 respectively with the 4th the triode Q4 and CPU is connected.
- 8. the probe water level detecting system based on variable-frequency pulse signal according to claim 7, it is characterised in that the rectification Filter circuit includes terminal J1, the first rectifier bridge BR1, the first electric capacity C1, the second electric capacity C2, the second rectifier bridge BR2, the 3rd electric capacity C3 and the 4th electric capacity C4,The terminal J1, the first rectifier bridge BR1 and the first electric capacity C1 are sequentially connected, and the first rectifier bridge BR1 is also It is connected with the second electric capacity C2,The first end of the second electric capacity C2 is connected with the colelctor electrode of the second triode Q2,The second end of the second electric capacity C2 is connected with the emitter stage of the first triode Q1,The terminal J1, the second rectifier bridge BR2 and the 3rd electric capacity C3 are sequentially connected, and the second rectifier bridge BR2 is also It is connected with the 4th electric capacity C4,The second rectifier bridge BR2 is also connected with the mu balanced circuit.
- 9. the probe water level detecting system based on variable-frequency pulse signal according to claim 8, it is characterised in that the voltage stabilizing Circuit includes voltage-stablizer U1, the 5th electric capacity C5 and the 6th electric capacity C6,The second rectifier bridge BR2, the voltage-stablizer U1 and the 5th electric capacity C5 are sequentially connected,The voltage-stablizer U1 is also connected with the 6th electric capacity C6,The voltage-stablizer U1 is also connected with the second optocoupler OC2, the 3rd optocoupler OC3 and CPU respectively.
- 10. the probe water level detecting system based on variable-frequency pulse signal according to claim 8, it is characterised in that the end Sub- J1 is also connected with transformer or Switching Power Supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201721014458.8U CN207180808U (en) | 2017-08-14 | 2017-08-14 | Probe water level detecting system based on variable-frequency pulse signal |
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| CN201721014458.8U CN207180808U (en) | 2017-08-14 | 2017-08-14 | Probe water level detecting system based on variable-frequency pulse signal |
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| CN207180808U true CN207180808U (en) | 2018-04-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108955812A (en) * | 2018-04-12 | 2018-12-07 | 无锡市启山林科技有限公司 | Commercial steamer alternation pulsation water level detecting system and its detection method |
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2017
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108955812A (en) * | 2018-04-12 | 2018-12-07 | 无锡市启山林科技有限公司 | Commercial steamer alternation pulsation water level detecting system and its detection method |
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