CN206259919U - A kind of transmitting-receiving based on ADCP systems is closed and puts transducer isolation circuit - Google Patents
A kind of transmitting-receiving based on ADCP systems is closed and puts transducer isolation circuit Download PDFInfo
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- CN206259919U CN206259919U CN201621397735.3U CN201621397735U CN206259919U CN 206259919 U CN206259919 U CN 206259919U CN 201621397735 U CN201621397735 U CN 201621397735U CN 206259919 U CN206259919 U CN 206259919U
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Abstract
The utility model provides a kind of transmitting-receiving conjunction based on ADCP systems and puts transducer isolation circuit.The circuit includes:Compression limiter, switch control unit, switch element, circuit board for receiving and transducer, compression limiter are respectively connected with switch element and transducer, are used to send the transmission signal of drive circuit to transducer, and prevent the reception signal of transducer feedback from passing through；Switch element is respectively connected with circuit board for receiving and switch control unit, to be closed or be disconnected according to the control signal of switch control unit.The state that the utility model passes through switch control unit controlling switch unit, so that control signal flow direction is to lead to radiating circuit, still leads to receiving circuit.Do so not only can fundamentally realize transceiver insulation, and contribute to the later stage to be easier to be achieved when receiving circuit self-checking function is done.
Description
Technical field
The utility model is related to water volume flow rate fields of measurement, more particularly to a kind of transmitting-receiving based on ADCP systems to close displacement energy
Device isolation circuit.
Background technology
ADCP is that acoustic Doppler fluid velocity profile instrument is a kind of measurement water volume flow rate developed based on acoustic Doppler principle
Equipment.Transducer is put using transmitting-receiving conjunction more than current ADCP products, carrys out velocity measurement.But this just brings a problem：Send and receive
How thoroughly isolation is realized.Using the method for diode-isolated more than current ADCP products, the structure chart of the method can be found in Fig. 1.
As shown in Figure 1：A ends are transmitting terminal, and B ends are receiving terminal, and when in emission state, no matter the voltage of A ends transmitting is positive voltage
Or negative voltage, will be by diode MUR160 clampers to diode forward pressure drop VFM=1V to B ends.So that A ends emitting voltage
Receiving terminal B is not reached, isolation is realized.But the problem that this isolation method is present is exactly the general clamper generating positive and negative voltage of diode
It is 0.7V, that is to say, that do not reach B ends higher than 0.7V, and being less than 0.7V can reach B ends so as to reach receiving circuit, it is impossible to it is real
It is existing completely isolated.In addition, when receiving circuit self-inspection is done, it is necessary to when B is terminated into measured signal, this can be subject to again to transmitting-receiving point
From the influence of diode.
In view of this, developing a kind of can realize that transmitting-receiving is closed and put the completely isolated transmitting-receiving of sending and receiving of transducer and close
It is this area enterprise and production unit problem demanding prompt solution to put transducer isolation circuit.
The content of the invention
The purpose of this utility model is the drawbacks of overcoming above-mentioned tradition transmitting-receiving separation scheme, so as to provide one kind be based on
The transmitting-receiving of ADCP systems is closed and puts transducer isolation circuit.
To achieve the above object, the utility model provides a kind of transmitting-receiving conjunction based on ADCP systems and puts transducer isolation electricity
Road.The circuit includes:Compression limiter, switch control unit, switch element, circuit board for receiving and transducer,
The compression limiter is respectively connected with the switch element and transducer, when switch element disconnects, will drive
The transmission signal of dynamic circuit is sent to transducer, and when switch element is closed, prevents the reception signal of transducer feedback from passing through；
The switch element is respectively connected with the circuit board for receiving and the switch control unit, to be opened according to
The control signal for closing control unit is closed or disconnected, and when disconnecting, the transmission signal for preventing compression limiter from coming passes through,
In closure, the reception signal of receive transducer feedback simultaneously sends it to circuit board for receiving.
Preferably, the switch control unit includes digital circuit board and data buffer,
The digital circuit board is connected with the data buffer, to output control signal；
The data buffer is connected with the switch element, is used to send the control signal of digital circuit board to switch
Unit.
Preferably, the data buffer is the single channel bus buffer register SN74AHC1G125 with ternary output.
Preferably, the switch element is MAX14757EUE chips.
Preferably, the compression limiter includes two diodes of reverse parallel connection.
The beneficial effects of the utility model are：By the state of switch control unit controlling switch unit, so as to control letter
Number flow direction is to lead to radiating circuit, still leads to receiving circuit.When in emission state, now made out by switch control unit
Close unit to be off, such emitting voltage is just entirely isolated, into not circuit board for receiving.Do so not only can be from
Transceiver insulation is fundamentally realized, and contributes to the later stage to be easier to be achieved when receiving circuit self-checking function is done.
Brief description of the drawings
Fig. 1 is that the electrical schematic diagram for putting transducer isolation circuit is closed in the existing transmitting-receiving based on ADCP systems；
Fig. 2 is that the structured flowchart for putting transducer isolation circuit is closed in a kind of transmitting-receiving based on ADCP systems of the present utility model；
Fig. 3 is that the knot for putting transducer isolation circuit switch element is closed in a kind of transmitting-receiving based on ADCP systems of the present utility model
Composition；
Fig. 4 is that transducer isolation circuit data buffer is put in a kind of transmitting-receiving conjunction based on ADCP systems of the present utility model
Structure chart；
Fig. 5 is that the electrical principle for putting transducer isolation circuit is closed in a kind of transmitting-receiving based on ADCP systems of the present utility model
Figure；
Fig. 6 is the physical circuit schematic diagram of Fig. 5；
Fig. 7 is that the isolation put transducer transmitting and receive signal is closed in a kind of transmitting-receiving based on ADCP systems of the present utility model
The flow chart of method.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and implementation
Example, is further elaborated to the utility model.It should be noted that accompanying drawing is merely illustrative, not according to tight
Lattice ratio is drawn, and promising may wherein describe partial enlargement, diminution convenient and carry out, also may be used for conventional partial structure
Can have certain default.
Fig. 2 is that the structured flowchart for putting transducer isolation circuit is closed in a kind of transmitting-receiving based on ADCP systems of the present utility model.
As shown in figure 1, a kind of transmitting-receiving based on ADCP systems of the present utility model is closed and puts transducer isolation circuit including limiting
Pressure unit 1, switch control unit 2, switch element 3, circuit board for receiving 4 and transducer 5.
Compression limiter 1 is respectively connected with switch element 3 and transducer 5, is mainly responsible for, when switch element 3 disconnects, to drive
The transmission signal of dynamic circuit is sent directly to transducer 5, and when switch element 3 is closed, prevents the reception letter of the feedback of transducer 5
Number pass through.
Switch element 3 is respectively connected with circuit board for receiving 4 and switch control unit 2, to according to switch control unit 2
Control signal is closed or disconnected, and when disconnecting, the transmission signal for preventing compression limiter 1 from coming passes through, and in closure, is connect
Receive the reception signal of the feedback of transducer 5 and send it to circuit board for receiving 4.
Wherein, compression limiter 1 can include two diodes of reverse parallel connection.Switch control unit 2 can be included
Digital circuit board 21 and data buffer 22, digital circuit board 21 is connected with data buffer 22, to output control signal；Number
It is connected with switch element 3 according to buffer 22, is used to send the control signal of digital circuit board 21 to switch element 3.
Illustrated with a specific embodiment below：
Because transducer is that the transducer put is closed in transmitting-receiving, so the big voltage signal of transmitting needed for transmitting transducer, and transducing
The small voltage signal of the reception of device can be produced by same transducer.So transmission signal and reception signal will be total in the pcb
With same wire.Therefore the utility model uses and a controllable switch element is accessed in the middle of this root wire, by switching
The closure state of control unit controlling switch unit, so that control signal flow direction is to lead to radiating circuit, still leads to reception electricity
Road.And the closure of switch element is clamped than diode, then more can thoroughly realize that transmitting-receiving is separated.
From the foregoing, switch element 3 is needed using a switch chip that can isolate transmitting receiving voltage.Due to transmitting
Voltage can reach 20V or so, and receiving voltage signal only has mV grades.Their isolation is realized, is selected in the present embodiment
Switch chip MAX14757EUE.MAX14757 is the product of maxim Maxims.It is suitable for transmitted in both directions.With the full amplitude of oscillation
Analog signal range.In unipolarity application, powered using+10V to+70V single supplies；In bipolarity application, using the double electricity of ± 35V
Source powers.Bipolar power supply can have deviation, not necessarily symmetrically.MAX14757 is normally opened (NO) spst switch of four-way.These
Switch has 5 Ω (representative value) conducting resistance, and conducting resistance flatness is 0.004 Ω (representative value).These parameters and ADCP
The match parameters of system requirements and transducer.Therefore such switch chip is selected, the structure of this chip can be found in Fig. 3, have
A1-B1, A2-B2, A3-B3, A4-B4,4 way switch, and corresponding 4 Enable Pin EN1- EN4.
In the present embodiment, data buffer 22 is using the single channel bus buffer register with ternary output
SN74AHC1G125.A25G (SN74AHC1G125) is the single channel bus buffer register with ternary output.Buffer register
Also known as buffer, it is divided to two kinds of input buffer and output buffer.The former effect is that the data for sending peripheral hardware are temporarily deposited
Put, so that processor takes it away；The effect of the latter is to be sent to the data of peripheral hardware for temporarily storage processor.There are data to delay
Rush device, so that it may so as to the CPU of high speed operation rises with the peripheral hardware for working at a slow speed coordinate and cushioning effect, realize the same of data transmission
Step.Because buffer connects on the data bus, therefore there must be ternary output function.The structure chart of SN74AHC1G125 can be found in
Fig. 4, with input A, output enables input, output end Y, earth terminal GND, power end VCC.Wherein,
What the tri-state input A of SN74AHC1G125 connect is digital circuit board 21.And it is switch chip MAX14757 that its output end Y connects
4 Enable Pin EN1- EN4.It is controlled by it the separation that 4 tunnels receive radiating circuit.
In Fig. 5, when normal transmission signal comes to reach A points through diode D4, D6 of compression limiter by drive circuit（A
Point is any An ends all the way of the four-way switch for being linked into Fig. 2 breaker in middle chips MAX14757, and n is linked into figure for 1 to 4, B points
The Bn ends corresponding with An ends of the four-way switch of 2 breaker in middle chip MAX14757, n is 1 to 4）, with a way switch of MAX14757
A1, B1 are illustrated：Now A1, B1 are off, and the transmission signal come by compression limiter diode D4, D6 is just
Transducer can be transmitted directly to.After transmission signal does not send, a signal now is given through data buffer by digital circuit board 21
The 22 Enable Pin EN1 for giving MAX1475 so that A1, B1 are connected.Because reception voltage signal is smaller, can be prevented by limiting unit logical
Cross, so receive signal and circuit board for receiving is just sent to by switch chip MAX14757.It is achieved thereby that receiving transmission signal
Isolation.
As shown in fig. 6, DD_DRIVE is the DD_DRIVE in Fig. 5.A1, A2, A3, A4 are the A points in Fig. 5.B1,
B2, B3, B4 are the B points in Fig. 5.Wherein A1, A2 are the two ends for being connected on transducer, and A3, A4 is connected on another transducer
Two ends.REV_SIG1 in Fig. 7, REV_SIG2, REV_SIG3, REV_SIG4 are that the REV_SIG in Fig. 5 is to be connected to receiving circuit
Plate.
Fig. 7 is that the isolation put transducer transmitting and receive signal is closed in a kind of transmitting-receiving based on ADCP systems of the present utility model
The flow chart of method.
In step 701, into emission state.
In a step 702, controlled switch unit by switch control unit, by compression limiter by the hair of drive circuit
Penetrate signal and be sent directly to transducer, and prevent the signal from being sent to circuit board for receiving by switch element；
In step 703, into reception state.
In step 704, closed by switch control unit controlling switch unit, prevent transducer from feeding back by compression limiter
The reception signal for returning passes through, and reception signal is sent to circuit board for receiving through switch element.
Wherein, the switch control unit in above-mentioned steps includes digital circuit board and data buffer, and switch control is single
Unit is controlled switch unit and closure is specifically included：
Exported by digital circuit board and be opened or closed control signal；
Digital circuit board output is received by data buffer to be opened or closed control signal and send it to switch list
Unit.
In addition, data buffer is the single channel bus buffer register SN74AHC1G125 with ternary output.Switch is single
Unit is MAX14757EUE chips.Compression limiter includes two diodes of reverse parallel connection.
, it is necessary to illustrate in description of the present utility model, term " connected " " connection " should be interpreted broadly, for example,
Can be fixedly connected, or be detachably connected, or be integrally connected；Can mechanically connect, or electrically connect；
Can be joined directly together, it is also possible to be indirectly connected to by intermediary.For the ordinary skill in the art, can have
Body situation understands concrete meaning of the above-mentioned term in the utility model.
Professional should further appreciate that, each example described with reference to the embodiments described herein
Unit and algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, hard in order to clearly demonstrate
The interchangeability of part and software, generally describes the composition and step of each example according to function in the above description.
These functions are performed with hardware or software mode actually, depending on the application-specific and design constraint of technical scheme.
Professional and technical personnel can realize described function to each specific application using distinct methods, but this realization
It is not considered that exceeding scope of the present utility model.
The method that is described with reference to the embodiments described herein can use hardware, computing device the step of algorithm
Software module, or the two combination is implemented.Software module can be placed in random access memory（RAM）, internal memory, read-only storage
（ROM）, programmable read only memory（PROM）, Erarable Programmable Read only Memory (EPROM), electrically erasable it is read-only
Known any other form in memory (EEPROM), register, hard disk, moveable magnetic disc, CD-ROM or technical field
Storage medium in.
Above-described specific embodiment, is entered to the purpose of this utility model, technical scheme and beneficial effect
One step is described in detail, be should be understood that and be the foregoing is only specific embodiment of the present utility model, is not used to limit
Fixed protection domain of the present utility model, all any modifications within spirit of the present utility model and principle, made, equally replaces
Change, improve, should be included within protection domain of the present utility model.
Claims (5)
1. a kind of transmitting-receiving based on ADCP systems is closed and puts transducer isolation circuit, it is characterised in that including:Compression limiter, switch
Control unit, switch element, circuit board for receiving and transducer,
The compression limiter is respectively connected with the switch element and transducer, when switch element disconnects, will drive electricity
The transmission signal on road is sent to transducer, and when switch element is closed, prevents the reception signal of transducer feedback from passing through；
The switch element is respectively connected with the circuit board for receiving and the switch control unit, to according to the switch control
The control signal of unit processed is closed or disconnected, and when disconnecting, the transmission signal for preventing compression limiter from coming passes through, and is closing
During conjunction, the reception signal of receive transducer feedback simultaneously sends it to circuit board for receiving.
2. a kind of transmitting-receiving based on ADCP systems according to claim 1 is closed and puts transducer isolation circuit, it is characterised in that
The switch control unit includes digital circuit board and data buffer,
The digital circuit board is connected with the data buffer, to output control signal；
The data buffer is connected with the switch element, is used to for the control signal of digital circuit board to send single to switch
Unit.
3. a kind of transmitting-receiving based on ADCP systems according to claim 2 is closed and puts transducer isolation circuit, it is characterised in that
The data buffer is the single channel bus buffer register SN74AHC1G125 with ternary output.
4. a kind of transmitting-receiving based on ADCP systems according to claim 1 and 2 is closed and puts transducer isolation circuit, and its feature exists
In the switch element is MAX14757EUE chips.
5. a kind of transmitting-receiving based on ADCP systems according to claim 1 is closed and puts transducer isolation circuit, it is characterised in that
The compression limiter includes two diodes of reverse parallel connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621397735.3U CN206259919U (en) | 2016-12-20 | 2016-12-20 | A kind of transmitting-receiving based on ADCP systems is closed and puts transducer isolation circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621397735.3U CN206259919U (en) | 2016-12-20 | 2016-12-20 | A kind of transmitting-receiving based on ADCP systems is closed and puts transducer isolation circuit |
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| CN206259919U true CN206259919U (en) | 2017-06-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788389A (en) * | 2016-12-20 | 2017-05-31 | 南京海普水文科技有限公司 | A kind of transmitting-receiving based on ADCP systems is closed and puts transducer isolation circuit and method |
| CN110007295A (en) * | 2019-04-30 | 2019-07-12 | 中国船舶工业系统工程研究院 | A signal acquisition protector for underwater acoustic transceiver combined transducer |
-
2016
- 2016-12-20 CN CN201621397735.3U patent/CN206259919U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788389A (en) * | 2016-12-20 | 2017-05-31 | 南京海普水文科技有限公司 | A kind of transmitting-receiving based on ADCP systems is closed and puts transducer isolation circuit and method |
| CN110007295A (en) * | 2019-04-30 | 2019-07-12 | 中国船舶工业系统工程研究院 | A signal acquisition protector for underwater acoustic transceiver combined transducer |
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