CN106209065A - The signal isolator of weak current duty - Google Patents
The signal isolator of weak current duty Download PDFInfo
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- CN106209065A CN106209065A CN201610605972.2A CN201610605972A CN106209065A CN 106209065 A CN106209065 A CN 106209065A CN 201610605972 A CN201610605972 A CN 201610605972A CN 106209065 A CN106209065 A CN 106209065A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017545—Coupling arrangements; Impedance matching circuits
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Abstract
The present invention proposes the signal isolator of a kind of weak current duty, it is characterized in that, including: MCU controller switches control signal end connects analog switch control circuit signal receiving end, MCU controller buck signal end connects step-down controller signal receiving end, MCU controller modulation-demodulation signal end connects modem signal receiving terminal, and MCU controller data outfan connects USB interface.The present invention can under 1 5mA state steady operation, it is achieved the isolation of signal, circuit design is reasonable, runs work smooth, it is ensured that data transmission is stable.
Description
Technical field
The present invention relates to electronic circuit field, particularly relate to the signal isolator of a kind of weak current duty.
Background technology
Industrial automation control system use 4-20mA signaling mode from the sixties, the most nearly 60 years.Due to
Being limited by technical capability at that time, electronic devices and components, using 4-20mA signaling mode is most suitable selection, but through half generation
The development recorded, development, the lifting of electronic devices and components performance further of electronic technology, we now can be accurate to 1-5mA signal
The most reliable and the most stable isolation processing (precision can reach the 0.1% of total range).Use 1-5mA signal and use 4-20mA signal
Comparing, decrease the energy expenditure of 3/4, meanwhile, this also makes the signal voltage in intrinsically safe circuit decline 3/4.
In prior art, standard signal transmission carries out stable transmission by signal isolator, but in industry secondary meter
The signal isolator circuit design of weak current duty is not the most the most ripe, and this just needs those skilled in the art badly and solves accordingly
Technical problem.
Summary of the invention
It is contemplated that at least solve technical problem present in prior art, the most innovatively propose a kind of weak current
The signal isolator of duty.
In order to realize the above-mentioned purpose of the present invention, the invention provides the signal isolator of a kind of weak current duty,
Including: MCU controller, analog switch control circuit, modem, step-down controller and USB interface；
MCU controller switches control signal end connects analog switch control circuit signal receiving end, and MCU controller blood pressure lowering is believed
Number end connect step-down controller signal receiving end, MCU controller modulation-demodulation signal end connect modem signal receiving terminal,
MCU controller data outfan connects USB interface.
Technique scheme have the beneficial effect that can under 1-5mA state steady operation, it is achieved the isolation of signal, electricity
Road is reasonable in design, runs work smooth, it is ensured that data transmission is stable.
The signal isolator of described weak current duty, it is preferred that also include that single pole double throw analog switchs；
Single pole double throw analog switching signal receiving terminal connects MCU controller modulation-demodulation signal end, described single-pole double throw mould
Intend switches signal output part and connect modem signal receiving terminal.
Having the beneficial effect that of technique scheme switchs the fast automatic break-make realizing power supply by single pole double throw analog.
The signal isolator of described weak current duty, it is preferred that also include digital to analog converter；
Digital to analog converter signal receiving end connects MCU controller buck signal end, and digital to analog converter signal output part connects
Step-down controller signal receiving end.
The signal isolator of described weak current duty, it is preferred that described modem includes:
7th electric capacity one end connects the 3rd resistance one end and modem chip power input respectively, the 7th electric capacity other end
Ground connection, the 3rd resistance other end connects power input, and the 3rd electric capacity one end connects the 2nd resistance one end and modem chip respectively
Analog digital conversion signal end, the 2nd resistance other end connects the 5th electric capacity one end and modem chip reference voltage output terminal respectively,
5th electric capacity other end ground connection, the 3rd electric capacity other end connects the 1st resistance one end and the 2nd electric capacity one end respectively, the 2nd electric capacity other end
Ground connection, the 1st resistance other end connects the 1st electric capacity one end box the 1st diode cathode respectively, the 1st electric capacity other end ground connection, and the 1st two
Pole pipe positive pole connects the 2nd diode cathode, and the 2nd diode cathode connects the 1st electric capacity one end and the 1st inductance one end respectively, the 1st electricity
Sense other end ground connection, the 1st inductance one end is also connected with the 4th electric capacity one end, and the 4th electric capacity other end connects the 3rd diode cathode respectively
With the 5th resistance one end, the 3rd diode cathode ground connection, the 5th resistance other end ground connection, the 5th resistance one end connects the 4th resistance one end,
The 4th resistance other end connects power end, and the 5th resistance one end is also connected with the first single pole double throw analog switch controlling signal input,
First single pole double throw analog switch control input connects HART data terminal, and modem chip clock control end connects the respectively
8 electric capacity and the 9th electric capacity, modem chip receives data terminal and connects single-chip data transmitting terminal, and modem chip sends number
The carrier data of HART is connected according to end.
The modulation /demodulation having the beneficial effect that the data realized by this modem of technique scheme, circuit cloth
Office is rationally, it is possible to obtains accurately and resolves HART data.
The signal isolator of described weak current duty, it is preferred that described step-down controller includes:
4th inductance one end connect blood pressure lowering conversion chip switch terminals, the 4th inductance other end connect respectively the 8th resistance one end and
25th electric capacity one end, the 8th resistance other end connects the 9th resistance one end and blood pressure lowering conversion chip pressure feedback port, the 25th electricity respectively
Holding other end ground connection, the 9th resistance other end ground connection, blood pressure lowering conversion chip electric current arranges end and soft start input connects the respectively
28 electric capacity one end, the 28th electric capacity other end connects the 29th electric capacity one end ground connection, and the 29th electric capacity other end connects blood pressure lowering respectively and turns
Changing chip power end and the 30th electric capacity one end, the 30th electric capacity other end connects the 3rd inductance one end, and the 3rd inductance other end connects respectively
Connecing the 4th diode cathode and the 6th resistance one end, the 4th diode cathode connects the 30th electric capacity one end and the 1st source transistor respectively
Pole, the 4th diode cathode is also connected with the 2nd inductance one end, the 2nd the inductance other end connect the 10th resistance one end, the 10th resistance another
End connects power end, and the 2nd inductance uses as transceiver, and the 7th resistance one end connects the 4th diode just actively, the 7th resistance another
End connects the 1st operational amplifier positive pole, and the 1st operational amplifier negative pole connects the 1st transistor drain, and the 1st transistor gate connects
1st operational amplifier output terminal, the 1st operational amplifier electrode input end is also connected with digital to analog converter.
Technique scheme have the beneficial effect that this reduction voltage circuit is capable of reduced pressure operation, it is ensured that circuit stability work.
The signal isolator of described weak current duty, it is preferred that described MCU controller includes:
The data output end of MCU control chip connects USB interface, and wherein the 14th resistance one end connection USB interface data are sent out
Sending end, the 14th resistance other end MCU control chip data sending terminal, the 15th resistance one end connects USB interface data receiver, the
The 15 resistance other ends connect MCU control chip data receiver and the 5th diode cathode respectively, the 5th diode cathode ground connection, and
16 resistance one end connect power end, and the 16th resistance other end connects the 15th resistance other end.
The signal isolator of described weak current duty, it is preferred that described analog switch control circuit includes:
Binding post the first end connects the 7th diode cathode and the 24th resistance one end respectively, and the 7th diode cathode connects respectively
Connecing binding post the second end and the 8th diode cathode, the 24th resistance other end connects analog switch Y1 end and the 26th electric capacity respectively
One end, the 26th electric capacity other end ground connection, the 24th resistance one end is also respectively connected with the 15th electric capacity one end and the 25th resistance one end, and the 15th
Electric capacity other end ground connection, the 25th resistance other end connects the 16th electric capacity one end and analog switch Y0 end, binding post second respectively
End is also respectively connected with the 22nd resistance one end and the 27th electric capacity one end, and the 22nd resistance other end connects the 23rd resistance one end, the 23rd electricity
The resistance other end connects the 19th electric capacity one end and analog switch Y7 end respectively, and the 27th electric capacity other end connects the 20th resistance one end respectively
With the 21st resistance one end, the 20th resistance other end ground connection, the 8th diode cathode connects binding post the 3rd end and the 20th electricity respectively
Resistance one end, the 21st resistance other end connects the 20th electric capacity one end and analog switch Y1 end, the 20th electric capacity other end ground connection, mould respectively
Intending switch Y4 end and connect the 17th resistance one end and the 18th resistance one end respectively, the 17th resistance other end connects the 9th diode respectively
Negative pole and ground connection, the 9th diode cathode connects the 18th resistance other end and the 19th resistance one end respectively, and the 19th resistance other end is even
Connecing power end, analog switch Z end connects the 33rd resistance one end, and the 33rd resistance other end connects the 21st electric capacity one end and the 32nd respectively
Resistance one end, the 21st electric capacity other end ground connection, the 32nd resistance other end connects the 2nd operational amplifier electrode input end, the 31st electricity
Resistance one end connects the 2nd operational amplifier negative input, and the 31st resistance other end connects the 28th resistance one end and the 29th electricity respectively
Resistance one end, the 28th resistance other end ground connection, the 29th resistance other end connects the 2nd operational amplifier output terminal and the 30th resistance respectively
One end, the 2nd operational amplifier output terminal is also connected with the 22nd electric capacity one end, and the 30th resistance other end connects the 25th electric capacity one end respectively
With analog-digital converter reference voltage end, the 25th electric capacity other end ground connection.
Technique scheme have the beneficial effect that analog switch control circuit can carry out the control break-make of power supply, it is achieved
The steady operation of power supply.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
The present invention can under 1-5mA state steady operation, it is achieved the isolation of signal, circuit design is reasonable, runs work
Smooth, it is ensured that data transmission is stable.
The additional aspect of the present invention and advantage will part be given in the following description, and part will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage are from combining the accompanying drawings below description to embodiment and will become
Substantially with easy to understand, wherein:
Fig. 1 is general illustration of the present invention；
Fig. 2 is modem schematic diagram of the present invention；
Fig. 3 is step-down controller schematic diagram of the present invention；
Fig. 4 is MCU controller schematic diagram of the present invention；
Fig. 5 is analog switch schematic diagram of the present invention.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most from start to finish
Same or similar label represents same or similar element or has the element of same or like function.Below with reference to attached
The embodiment that figure describes is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention, it is to be understood that term " longitudinally ", " laterally ", " on ", D score, "front", "rear",
The orientation of the instruction such as "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward " or position relationship are for based on accompanying drawing institute
The orientation shown or position relationship, be for only for ease of and describe the present invention and simplify description rather than instruction or the dress of hint indication
Put or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that limit to the present invention
System.
In describing the invention, unless otherwise prescribed and limit, it should be noted that term " is installed ", " being connected ",
" connect " and should be interpreted broadly, for example, it may be mechanically connected or electrical connection, it is also possible to be the connection of two element internals, can
Being to be joined directly together, it is also possible to be indirectly connected to by intermediary, for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term.
As it is shown in figure 1, the invention provides the signal isolator of a kind of weak current duty, including: MCU controller,
Analog switch control circuit, modem, step-down controller and USB interface；
MCU controller switches control signal end connects analog switch control circuit signal receiving end, and MCU controller blood pressure lowering is believed
Number end connect step-down controller signal receiving end, MCU controller modulation-demodulation signal end connect modem signal receiving terminal,
MCU controller data outfan connects USB interface.
Technique scheme have the beneficial effect that can under 1-5mA state steady operation, it is achieved the isolation of signal, electricity
Road is reasonable in design, runs work smooth, it is ensured that data transmission is stable.
The signal isolator of described weak current duty, it is preferred that also include that single pole double throw analog switchs；
Single pole double throw analog switching signal receiving terminal connects MCU controller modulation-demodulation signal end, described single-pole double throw mould
Intend switches signal output part and connect modem signal receiving terminal.
Having the beneficial effect that of technique scheme switchs the fast automatic break-make realizing power supply by single pole double throw analog.
The signal isolator of described weak current duty, it is preferred that also include digital to analog converter；
Digital to analog converter signal receiving end connects MCU controller buck signal end, and digital to analog converter signal output part connects
Step-down controller signal receiving end.
As in figure 2 it is shown, the signal isolator of described weak current duty, it is preferred that described modem includes:
7th electric capacity one end connects the 3rd resistance one end and modem chip power input respectively, the 7th electric capacity other end
Ground connection, the 3rd resistance other end connects power input, and the 3rd electric capacity one end connects the 2nd resistance one end and modem chip respectively
Analog digital conversion signal end, the 2nd resistance other end connects the 5th electric capacity one end and modem chip reference voltage output terminal respectively,
5th electric capacity other end ground connection, the 3rd electric capacity other end connects the 1st resistance one end and the 2nd electric capacity one end respectively, the 2nd electric capacity other end
Ground connection, the 1st resistance other end connects the 1st electric capacity one end box the 1st diode cathode respectively, the 1st electric capacity other end ground connection, and the 1st two
Pole pipe positive pole connects the 2nd diode cathode, and the 2nd diode cathode connects the 1st electric capacity one end and the 1st inductance one end respectively, the 1st electricity
Sense other end ground connection, the 1st inductance one end is also connected with the 4th electric capacity one end, and the 4th electric capacity other end connects the 3rd diode cathode respectively
With the 5th resistance one end, the 3rd diode cathode ground connection, the 5th resistance other end ground connection, the 5th resistance one end connects the 4th resistance one end,
The 4th resistance other end connects power end, and the 5th resistance one end is also connected with the first single pole double throw analog switch controlling signal input,
First single pole double throw analog switch control input connects HART data terminal, and modem chip clock control end connects the respectively
8 electric capacity and the 9th electric capacity, modem chip receives data terminal and connects single-chip data transmitting terminal, and modem chip sends number
The carrier data of HART is connected according to end.
The modulation /demodulation having the beneficial effect that the data realized by this modem of technique scheme, circuit cloth
Office is rationally, it is possible to obtains accurately and resolves HART data.
As it is shown on figure 3, the signal isolator of described weak current duty, it is preferred that described step-down controller includes:
4th inductance one end connect blood pressure lowering conversion chip switch terminals, the 4th inductance other end connect respectively the 8th resistance one end and
25th electric capacity one end, the 8th resistance other end connects the 9th resistance one end and blood pressure lowering conversion chip pressure feedback port, the 25th electricity respectively
Holding other end ground connection, the 9th resistance other end ground connection, blood pressure lowering conversion chip electric current arranges end and soft start input connects the respectively
28 electric capacity one end, the 28th electric capacity other end connects the 29th electric capacity one end ground connection, and the 29th electric capacity other end connects blood pressure lowering respectively and turns
Changing chip power end and the 30th electric capacity one end, the 30th electric capacity other end connects the 3rd inductance one end, and the 3rd inductance other end connects respectively
Connecing the 4th diode cathode and the 6th resistance one end, the 4th diode cathode connects the 30th electric capacity one end and the 1st source transistor respectively
Pole, the 4th diode cathode is also connected with the 2nd inductance one end, the 2nd the inductance other end connect the 10th resistance one end, the 10th resistance another
End connects power end, and the 2nd inductance uses as transceiver, and the 7th resistance one end connects the 4th diode just actively, the 7th resistance another
End connects the 1st operational amplifier positive pole, and the 1st operational amplifier negative pole connects the 1st transistor drain, and the 1st transistor gate connects
1st operational amplifier output terminal, the 1st operational amplifier electrode input end is also connected with digital to analog converter.
Technique scheme have the beneficial effect that this reduction voltage circuit is capable of reduced pressure operation, it is ensured that circuit stability work.
As shown in Figure 4, the signal isolator of described weak current duty, it is preferred that described MCU controller includes:
The data output end of MCU control chip connects USB interface, and wherein the 14th resistance one end connection USB interface data are sent out
Sending end, the 14th resistance other end MCU control chip data sending terminal, the 15th resistance one end connects USB interface data receiver, the
The 15 resistance other ends connect MCU control chip data receiver and the 5th diode cathode respectively, the 5th diode cathode ground connection, and
16 resistance one end connect power end, and the 16th resistance other end connects the 15th resistance other end.
As it is shown in figure 5, the signal isolator of described weak current duty, it is preferred that described analog switch controls electricity
Road includes:
Binding post the first end connects the 7th diode cathode and the 24th resistance one end respectively, and the 7th diode cathode connects respectively
Connecing binding post the second end and the 8th diode cathode, the 24th resistance other end connects analog switch Y1 end and the 26th electric capacity respectively
One end, the 26th electric capacity other end ground connection, the 24th resistance one end is also respectively connected with the 15th electric capacity one end and the 25th resistance one end, and the 15th
Electric capacity other end ground connection, the 25th resistance other end connects the 16th electric capacity one end and analog switch Y0 end, binding post second respectively
End is also respectively connected with the 22nd resistance one end and the 27th electric capacity one end, and the 22nd resistance other end connects the 23rd resistance one end, the 23rd electricity
The resistance other end connects the 19th electric capacity one end and analog switch Y7 end respectively, and the 27th electric capacity other end connects the 20th resistance one end respectively
With the 21st resistance one end, the 20th resistance other end ground connection, the 8th diode cathode connects binding post the 3rd end and the 20th electricity respectively
Resistance one end, the 21st resistance other end connects the 20th electric capacity one end and analog switch Y1 end, the 20th electric capacity other end ground connection, mould respectively
Intending switch Y4 end and connect the 17th resistance one end and the 18th resistance one end respectively, the 17th resistance other end connects the 9th diode respectively
Negative pole and ground connection, the 9th diode cathode connects the 18th resistance other end and the 19th resistance one end respectively, and the 19th resistance other end is even
Connecing power end, analog switch Z end connects the 33rd resistance one end, and the 33rd resistance other end connects the 21st electric capacity one end and the 32nd respectively
Resistance one end, the 21st electric capacity other end ground connection, the 32nd resistance other end connects the 2nd operational amplifier electrode input end, the 31st electricity
Resistance one end connects the 2nd operational amplifier negative input, and the 31st resistance other end connects the 28th resistance one end and the 29th electricity respectively
Resistance one end, the 28th resistance other end ground connection, the 29th resistance other end connects the 2nd operational amplifier output terminal and the 30th resistance respectively
One end, the 2nd operational amplifier output terminal is also connected with the 22nd electric capacity one end, and the 30th resistance other end connects the 25th electric capacity one end respectively
With analog-digital converter reference voltage end, the 25th electric capacity other end ground connection.
Technique scheme have the beneficial effect that analog switch control circuit can carry out the control break-make of power supply, it is achieved
The steady operation of power supply.
Wherein MCU controller is preferably PIC18F26K20；
Step-down controller is preferably LTC3632；
7 analog switch control circuits are preferably NX3L4051；
Modem is preferably AD5700；
Single pole double throw analog switch is preferably NC7SB3157；
Can effectively carry out detecting control by this analog switch control circuit, make signal isolator preferably play inspection
Survey effect.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or spy
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.And, the specific features of description, structure, material or feature can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
These embodiments can be carried out multiple change in the case of departing from the principle of the present invention and objective, revise, replace and modification, this
The scope of invention is limited by claim and equivalent thereof.
Claims (7)
1. the signal isolator of a weak current duty, it is characterised in that including: MCU controller, analog switch control electricity
Road, modem, step-down controller and USB interface；
MCU controller switches control signal end connects analog switch control circuit signal receiving end, MCU controller buck signal end
Connecting step-down controller signal receiving end, MCU controller modulation-demodulation signal end connects modem signal receiving terminal, MCU
Controller data outfan connects USB interface.
The signal isolator of weak current duty the most according to claim 1, it is characterised in that also include single-pole double throw
Analog switch；
Single pole double throw analog switching signal receiving terminal connects MCU controller modulation-demodulation signal end, and described single pole double throw analog is opened
Close switching signal outfan and connect modem signal receiving terminal.
The signal isolator of weak current duty the most according to claim 1, it is characterised in that also include digital-to-analogue conversion
Device；
Digital to analog converter signal receiving end connects MCU controller buck signal end, and digital to analog converter signal output part connects blood pressure lowering
Transducer signal receiving terminal.
The signal isolator of weak current duty the most according to claim 1, it is characterised in that described modem
Including:
7th electric capacity one end connects the 3rd resistance one end and modem chip power input respectively, the 7th electric capacity other end ground connection,
The 3rd resistance other end connects power input, and the 3rd electric capacity one end connects the 2nd resistance one end and modem chip modulus respectively
Conversion signal end, the 2nd resistance other end connects the 5th electric capacity one end and modem chip reference voltage output terminal respectively, the 5th electricity
Holding other end ground connection, the 3rd electric capacity other end connects the 1st resistance one end and the 2nd electric capacity one end respectively, the 2nd electric capacity other end ground connection,
The 1st resistance other end connects the 1st electric capacity one end box the 1st diode cathode respectively, and the 1st electric capacity other end ground connection, the 1st diode is just
Pole connect the 2nd diode cathode, the 2nd diode cathode connects the 1st electric capacity one end and the 1st inductance one end respectively, the 1st inductance another
End ground connection, the 1st inductance one end is also connected with the 4th electric capacity one end, and the 4th electric capacity other end connects the 3rd diode cathode and the 5th electricity respectively
Resistance one end, the 3rd diode cathode ground connection, the 5th resistance other end ground connection, the 5th resistance one end connects the 4th resistance one end, the 4th resistance
The other end connects power end, and the 5th resistance one end is also connected with the first single pole double throw analog switch controlling signal input, the first hilted broadsword
Double-throw analog switch control input connect HART data terminal, modem chip clock control end connect respectively the 8th electric capacity and
9th electric capacity, modem chip receives data terminal and connects single-chip data transmitting terminal, and modem chip sends data terminal and connects
The carrier data of HART.
The signal isolator of weak current duty the most according to claim 1, it is characterised in that described step-down controller
Including:
4th inductance one end connects blood pressure lowering conversion chip switch terminals, and the 4th inductance other end connects the 8th resistance one end and the 25th respectively
Electric capacity one end, the 8th resistance other end connects the 9th resistance one end and blood pressure lowering conversion chip pressure feedback port respectively, and the 25th electric capacity is another
One end ground connection, the 9th resistance other end ground connection, blood pressure lowering conversion chip electric current arranges end and soft start input connects the 28th electricity respectively
Holding one end, the 28th electric capacity other end connects the 29th electric capacity one end ground connection, and the 29th electric capacity other end connects blood pressure lowering conversion core respectively
Sheet power end and the 30th electric capacity one end, the 30th electric capacity other end connects the 3rd inductance one end, and the 3rd inductance other end connects the 4th respectively
Diode cathode and the 6th resistance one end, the 4th diode cathode connects the 30th electric capacity one end and the 1st transistor source respectively, and the 4th
Diode cathode is also connected with the 2nd inductance one end, and the 2nd inductance other end connects the 10th resistance one end, and the 10th resistance other end connects
Power end, the 2nd inductance uses as transceiver, and it is just positive that the 7th resistance one end connects the 4th diode, and the 7th resistance other end connects
1st operational amplifier positive pole, the 1st operational amplifier negative pole connects the 1st transistor drain, and the 1st transistor gate connects the 1st computing
Amplifier out, the 1st operational amplifier electrode input end is also connected with digital to analog converter.
The signal isolator of weak current duty the most according to claim 1, it is characterised in that described MCU controller
Including:
The data output end of MCU control chip connects USB interface, and wherein the 14th resistance one end connects USB interface data sending terminal,
14th resistance other end MCU control chip data sending terminal, the 15th resistance one end connects USB interface data receiver, the 15th electricity
The resistance other end connects MCU control chip data receiver and the 5th diode cathode, the 5th diode cathode ground connection, the 16th electricity respectively
Resistance one end connects power end, and the 16th resistance other end connects the 15th resistance other end.
The signal isolator of weak current duty the most according to claim 1, it is characterised in that described analog switch control
Circuit processed includes:
Binding post the first end connects the 7th diode cathode and the 24th resistance one end respectively, and the 7th diode cathode connects respectively and connects
Line terminals the second end and the 8th diode cathode, the 24th resistance other end connects analog switch Y1 end and the 26th electric capacity one end respectively,
26th electric capacity other end ground connection, the 24th resistance one end is also respectively connected with the 15th electric capacity one end and the 25th resistance one end, the 15th electric capacity
Other end ground connection, the 25th resistance other end connects the 16th electric capacity one end and analog switch Y0 end respectively, and binding post the second end is also
Connecting the 22nd resistance one end and the 27th electric capacity one end respectively, the 22nd resistance other end connects the 23rd resistance one end, and the 23rd resistance is another
One end connects the 19th electric capacity one end and analog switch Y7 end respectively, and the 27th electric capacity other end connects the 20th resistance one end and respectively
21 resistance one end, the 20th resistance other end ground connection, the 8th diode cathode connects binding post the 3rd end and the 20th resistance one respectively
End, the 21st resistance other end connects the 20th electric capacity one end and analog switch Y1 end respectively, and the 20th electric capacity other end ground connection, simulation is opened
Closing Y4 end and connect the 17th resistance one end and the 18th resistance one end respectively, the 17th resistance other end connects the 9th diode cathode respectively
And ground connection, the 9th diode cathode connects the 18th resistance other end and the 19th resistance one end respectively, and the 19th resistance other end connects electricity
Source, analog switch Z end connects the 33rd resistance one end, and the 33rd resistance other end connects the 21st electric capacity one end and the 32nd resistance respectively
One end, the 21st electric capacity other end ground connection, the 32nd resistance other end connects the 2nd operational amplifier electrode input end, the 31st resistance one
End connects the 2nd operational amplifier negative input, and the 31st resistance other end connects the 28th resistance one end and the 29th resistance one respectively
End, the 28th resistance other end ground connection, the 29th resistance other end connects the 2nd operational amplifier output terminal and the 30th resistance one respectively
End, the 2nd operational amplifier output terminal is also connected with the 22nd electric capacity one end, the 30th resistance other end connect respectively the 25th electric capacity one end and
Analog-digital converter reference voltage end, the 25th electric capacity other end ground connection.
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| CN2907075Y (en) * | 2006-04-21 | 2007-05-30 | 郑国书 | Novel power-saving input device |
| CN201629667U (en) * | 2009-10-12 | 2010-11-10 | 张芮 | Power supply device |
| CN203135922U (en) * | 2012-12-31 | 2013-08-14 | 重庆川仪自动化股份有限公司 | HART modulator-demodulator |
| CN203965551U (en) * | 2014-08-01 | 2014-11-26 | 惠州盛太克仪表有限公司 | A kind of multichannel transmitters sense device |
| CN205178188U (en) * | 2015-12-12 | 2016-04-20 | 西安科技大学 | Safety socket |
-
2016
- 2016-07-28 CN CN201610605972.2A patent/CN106209065B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2907075Y (en) * | 2006-04-21 | 2007-05-30 | 郑国书 | Novel power-saving input device |
| CN201629667U (en) * | 2009-10-12 | 2010-11-10 | 张芮 | Power supply device |
| CN203135922U (en) * | 2012-12-31 | 2013-08-14 | 重庆川仪自动化股份有限公司 | HART modulator-demodulator |
| CN203965551U (en) * | 2014-08-01 | 2014-11-26 | 惠州盛太克仪表有限公司 | A kind of multichannel transmitters sense device |
| CN205178188U (en) * | 2015-12-12 | 2016-04-20 | 西安科技大学 | Safety socket |
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| CN106209065B (en) | 2019-04-02 |
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