CN107682003A - A kind of number bus isolates telecommunication circuit - Google Patents
A kind of number bus isolates telecommunication circuit Download PDFInfo
- Publication number
- CN107682003A CN107682003A CN201710831232.5A CN201710831232A CN107682003A CN 107682003 A CN107682003 A CN 107682003A CN 201710831232 A CN201710831232 A CN 201710831232A CN 107682003 A CN107682003 A CN 107682003A
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- input
- output
- circuit
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- comparator
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Classifications
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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
- H03K19/017572—Coupling arrangements; Impedance matching circuits using opto-electronic devices
Abstract
The present invention relates to a kind of number bus to isolate telecommunication circuit, it is characterized in that, including multichannel input/output circuitry, digital signal input end, digital signal output end, all the way data signal input/output terminal, input circuit and output circuit all the way are included per road input/output circuitry.Circuit realiration of the present invention is simple, reliable, not only it is applicable the isolation and communication of the input/output signal to the number bus of wide-voltage range, it is also suitable the on-off model input/output circuitry of 24V in commercial Application, and the high-level threshold of 24V switching value voltages can arbitrarily be set as needed, can be achieved with by adjusting comparison reference voltage Vr values.
Description
Technical field
The present invention relates to it is a kind of suitable for bus type digital temperature and humidity sensor be used for realize Bus isolation and number
According to the circuit of communication.
Background technology
Present single line or the digital temperature and humidity sensor of two wires data/address bus formula are applied in many fields.Although with
It is more reliable by cable transmission measurement than traditional mode signal that data signal by bus transfer obtains temperature, humidity measurements
And strong antijamming capability, but there is also signal acquiring system and Bus isolation difficult problem.
The input of general industry instrument digital signal is more typical with optocoupler isolation ratio, and its typical application circuit is as shown in figure 1, figure
Middle R1、R2For resistance, U1For optocoupler.When optocoupler input signal IN is high level, optocoupler is not turned on, and optocoupler output OUT is height
Level；When optocoupler input signal IN is low level, optocoupler conducting, optocoupler output OUT is low level.But during this circuit concrete application
There is specific requirement to optocoupler input signal IN magnitude of voltage, if VCCFor 5V power voltage supply systems, then signal IN high level voltage
3.3V is cannot be below, because optocoupler input conducting voltage is typically 1.15V, then 5-3.3-1.15=0.55 (V), if resistance R1For
510 Ω, flow through resistance R1Electric current be about 1mA, optocoupler is in the conduction state.In practical application, inside signal acquiring system
The high low value of signal level is certain, but the voltage range of external digital bus is very wide, from 2.7V~5.5V, as long as voltage is higher than 2.5V
High level is taken as, circuit application so as shown in Figure 1 is restricted.
The content of the invention
Present invention solves the technical problem that it is：The data signal input and output of wide-voltage range are realized with same circuits.
In order to solve the above-mentioned technical problem, the technical scheme is that providing a kind of number bus isolation communication electricity
Road, it is characterised in that including multichannel input/output circuitry, include digital signal input end, numeral per road input/output circuitry
Signal output part, all the way data signal input/output terminal, input circuit and output circuit all the way, wherein：
Digital signal output end connects data signal input/output terminal via output circuit, and output circuit includes photoelectricity coupling
Close circuit one and open-drain comparator one, the input connection digital signal output end of photoelectric coupling circuit one, photoelectric coupling circuit one
Output connection open-drain comparator one in-phase input end, the inverting input input comparison voltage of open-drain comparator one, open-drain
The output end connection data signal input/output terminal of comparator one, constant pressure source connect the defeated of open-drain comparator one via resistance one
Go out end；
Data signal input/output terminal connects digital signal input end via input circuit, and input circuit includes photoelectricity coupling
Close circuit two and open-drain comparator two, the in-phase input end of data signal input/output terminal connection open-drain comparator two, constant pressure source
The in-phase input end of open-drain comparator two is also connected via resistance one, the inverting input input of open-drain comparator two is more electric
Pressure, the input of the output end connection photoelectric coupling circuit two of open-drain comparator two, the output connection numeral of photoelectric coupling circuit two
Signal input part.
Preferably, constant pressure source connects the output end of the open-drain comparator two via resistance two.
Circuit realiration of the present invention is simple, reliable, is not only applicable the input/output signal to the number bus of wide-voltage range
Isolation and communication, be also suitable the on-off model input/output circuitry of 24V in commercial Application, and 24V switching value voltages
High-level threshold can arbitrarily be set as needed, can be achieved with by adjusting comparison reference voltage Vr values.
Brief description of the drawings
Fig. 1 is the circuit for transmitting digital signals of existing single line light-coupled isolation；
Fig. 2 is the single-wire data bus input/output circuitry disclosed in embodiment.
Embodiment
To become apparent the present invention, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
By taking single-wire data bus input/output circuitry as shown in Figure 2 as an example, to a kind of number bus provided by the invention
Isolation telecommunication circuit is further detailed.
Single-wire data bus input/output circuitry as shown in Figure 2, mainly by optocoupler U1、U2, open-drain output compares
Device U3A、U3B, resistance R1~R6, constant pressure source VCC、VDDComposition.Open-drain output comparator and in general comparator difference are
The high level voltage value of comparator output has external circuit decision, so unrelated with comparator itself operating voltage.Optocoupler U1With
Open-drain output comparator U3AForm digital signal output circuit；Optocoupler U2With open-drain output comparator U3BForm data signal input
Circuit.D10UTFor output digit signals, D1INTo input data signal, DB1For input/output data signal, VrFor comparator ratio
It can as needed be set compared with reference voltage, 1.5V be designed as in this circuit.
The operation principle of Fig. 2 circuits is：
1. circuit makees digital signal output
(1) signal D10UTFor high level when, optocoupler U1It is not turned on, optocoupler output is high level, i.e. IN+For high level, so
No matter in 5V supply voltage systems, or 3.3V supply voltage systems, IN+Voltage is all higher than Vr, comparator U3AExport as high electricity
It is flat, and high level voltage value is by upperDrawResistance R3On voltage VDDDetermine；
(2) signal D10UTFor low level when, optocoupler U1Conducting, optocoupler output is low level, i.e. IN+For low level, IN+Electricity
Force down in Vr, comparator U3AExport as low level.
2. circuit makees data signal input
(1) signal D10UTPut high level, release bus signals DB1, i.e. DB1For high level state, this principle is by above electric
Make to illustrate during digital signal output in road；
(2) input signal DB1For high level when, due to DB1Voltage is higher than Vr, comparator U3BHigh level is exported, i.e. OUT is
High level, optocoupler U2It is not turned on, optocoupler output is high level, i.e. signal D1INFor high level；
(3) when DB1 bus signals are low level, due to DB1Voltage is less than Vr, comparator U3BLow level is exported, i.e. OUT is
Low level, optocoupler U2Conducting, optocoupler output is low level, i.e. signal D1INFor low level.
The present invention requires low to the number bus voltage range for needing to isolate, communicate, and circuit is versatile, 3.3V power supplies system
System and 5V electric power systems are all suitable for, or even the 24V voltage signal systems of industrial standard are all suitable for.The voltage threshold of high level can root
Given according to requiring arbitrarily devised.
Claims (2)
1. a kind of number bus isolates telecommunication circuit, it is characterised in that including multichannel input/output circuitry, per road input/output
Circuit includes digital signal input end, digital signal output end, all the way data signal input/output terminal, input circuit and all the way
Output circuit, wherein：
Digital signal output end connects data signal input/output terminal via output circuit, and output circuit includes photoelectric coupling electricity
Road one and open-drain comparator one, photoelectric coupling circuit one input connection digital signal output end, photoelectric coupling circuit one it is defeated
Go out to connect the in-phase input end of open-drain comparator one, the inverting input input comparison voltage of open-drain comparator one, open-drain compares
The output end connection data signal input/output terminal of device one, constant pressure source connect the output end of open-drain comparator one via resistance one；
Data signal input/output terminal connects digital signal input end via input circuit, and input circuit includes photoelectric coupling electricity
Road two and open-drain comparator two, the in-phase input end of data signal input/output terminal connection open-drain comparator two, constant pressure source via
Resistance one also connects the in-phase input end of open-drain comparator two, the inverting input input comparison voltage of open-drain comparator two, opens
The input of the output end connection photoelectric coupling circuit two of comparator two is leaked, the output connection data signal of photoelectric coupling circuit two is defeated
Enter end.
2. a kind of number bus isolation telecommunication circuit as claimed in claim 1, it is characterised in that constant pressure source connects via resistance two
Connect the output end of the open-drain comparator two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710831232.5A CN107682003A (en) | 2017-09-15 | 2017-09-15 | A kind of number bus isolates telecommunication circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710831232.5A CN107682003A (en) | 2017-09-15 | 2017-09-15 | A kind of number bus isolates telecommunication circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107682003A true CN107682003A (en) | 2018-02-09 |
Family
ID=61136196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710831232.5A Withdrawn CN107682003A (en) | 2017-09-15 | 2017-09-15 | A kind of number bus isolates telecommunication circuit |
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| Country | Link |
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| CN (1) | CN107682003A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110134052A (en) * | 2019-06-19 | 2019-08-16 | 深圳市佳运通电子有限公司 | A kind of digital signal acquiring circuit being compatible with a variety of output forms |
| CN110134052B (en) * | 2019-06-19 | 2024-04-26 | 深圳市佳运通电子有限公司 | Digital signal acquisition circuit compatible with multiple output forms |
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| CN202652187U (en) * | 2012-06-05 | 2013-01-02 | 梅特勒-托利多仪器（上海）有限公司 | Micropower medium-speed digital signal isolating circuit |
| CN102857208A (en) * | 2012-08-02 | 2013-01-02 | 北京交通大学 | High-speed bidirectional communication isolating circuit based on dual optocouplers |
| CN103227636A (en) * | 2013-03-27 | 2013-07-31 | 武汉新慧电气科技有限公司 | High-isolation direct splicing half-duplex communication interface module for interconnection of multiple controllers |
| CN204334571U (en) * | 2014-12-08 | 2015-05-13 | 广东美的制冷设备有限公司 | A kind of two-way communication circuit and air conditioner |
| CN204349433U (en) * | 2014-12-29 | 2015-05-20 | 乐星产电(无锡)有限公司 | Frequency converter and frequency converter output short circuit protection circuit |
| CN105576599A (en) * | 2016-03-15 | 2016-05-11 | 西安科技大学 | Overcurrent or short-circuit fault signal isolation detection circuit and design method thereof |
| CN205506915U (en) * | 2016-03-15 | 2016-08-24 | 西安科技大学 | Low -power consumption overflows signal isolation detection circuitry |
| CN106803340A (en) * | 2017-02-28 | 2017-06-06 | 威胜集团有限公司 | MBUS telecommunication circuits, communication means and its measuring instrument being made |
| CN106953629A (en) * | 2017-04-11 | 2017-07-14 | 深圳飞沃拜特技术有限公司 | Isolated form digital input circuit |
| CN207251583U (en) * | 2017-09-15 | 2018-04-17 | 上海微程电气设备有限公司 | Number bus isolates telecommunication circuit |
-
2017
- 2017-09-15 CN CN201710831232.5A patent/CN107682003A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202652187U (en) * | 2012-06-05 | 2013-01-02 | 梅特勒-托利多仪器（上海）有限公司 | Micropower medium-speed digital signal isolating circuit |
| CN102857208A (en) * | 2012-08-02 | 2013-01-02 | 北京交通大学 | High-speed bidirectional communication isolating circuit based on dual optocouplers |
| CN103227636A (en) * | 2013-03-27 | 2013-07-31 | 武汉新慧电气科技有限公司 | High-isolation direct splicing half-duplex communication interface module for interconnection of multiple controllers |
| CN204334571U (en) * | 2014-12-08 | 2015-05-13 | 广东美的制冷设备有限公司 | A kind of two-way communication circuit and air conditioner |
| CN204349433U (en) * | 2014-12-29 | 2015-05-20 | 乐星产电(无锡)有限公司 | Frequency converter and frequency converter output short circuit protection circuit |
| CN105576599A (en) * | 2016-03-15 | 2016-05-11 | 西安科技大学 | Overcurrent or short-circuit fault signal isolation detection circuit and design method thereof |
| CN205506915U (en) * | 2016-03-15 | 2016-08-24 | 西安科技大学 | Low -power consumption overflows signal isolation detection circuitry |
| CN106803340A (en) * | 2017-02-28 | 2017-06-06 | 威胜集团有限公司 | MBUS telecommunication circuits, communication means and its measuring instrument being made |
| CN106953629A (en) * | 2017-04-11 | 2017-07-14 | 深圳飞沃拜特技术有限公司 | Isolated form digital input circuit |
| CN207251583U (en) * | 2017-09-15 | 2018-04-17 | 上海微程电气设备有限公司 | Number bus isolates telecommunication circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110134052A (en) * | 2019-06-19 | 2019-08-16 | 深圳市佳运通电子有限公司 | A kind of digital signal acquiring circuit being compatible with a variety of output forms |
| CN110134052B (en) * | 2019-06-19 | 2024-04-26 | 深圳市佳运通电子有限公司 | Digital signal acquisition circuit compatible with multiple output forms |
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Application publication date: 20180209 |
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| WW01 | Invention patent application withdrawn after publication |