CN108173543A - A kind of two-way isolation circuit of single-wire communication bus - Google Patents
A kind of two-way isolation circuit of single-wire communication bus Download PDFInfo
- Publication number
- CN108173543A CN108173543A CN201711435296.XA CN201711435296A CN108173543A CN 108173543 A CN108173543 A CN 108173543A CN 201711435296 A CN201711435296 A CN 201711435296A CN 108173543 A CN108173543 A CN 108173543A
- Authority
- CN
- China
- Prior art keywords
- isolation
- bus
- bus driver
- output port
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- H03K19/017509—Interface arrangements
- H03K19/017536—Interface arrangements using opto-electronic devices
-
- 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
- H03K19/003—Modifications for increasing the reliability for protection
Abstract
The invention discloses a kind of two-way isolation circuits of single-wire communication bus, can carry out two-way Phototube Coupling to single-wire communication bus, realize that one kind can be with the jamproof single-wire communication bus of lightning protection.Circuit provided by the invention is connect by control circuit with the first bus driver, optocoupler, the second bus driver successively, is finally connected with single wire bus device.And the timesharing bidirectional transmit-receive of this circuit is realized using the enable signal that control circuit is sent out.
Description
Technical field
The invention belongs to automatic test technology fields, are related to a kind of Auto-Test System power supply design.
Background technology
At present in automation field, single-wire communication bus is few with its communication line, and it is real can to mount multiple single wire bus devices
The characteristics of existing multimetering, is widely used.In the application common issue is that because bus is disturbed source (such as thunder and lightning, electrostatic
Overvoltage etc. caused by electric discharge etc.) influence, it is possible to bus is caused to be stuck or indivedual transceiver damages；If bus is excessively electric
Pressure protection is bad to be this may result in multiple or even whole transceivers and is burned out.It is assisted there is presently no one kind for single-wire communication bus
The isolation lightning protection anti-jamming circuit of view feature, this increases the office that unibus equipment uses under complex environment to a certain extent
It is sex-limited.
For example, in temperature measurement system, multiple digital temperature sensors are mounted on a communication bus, due to the use of ring
Communication line is under outdoor conditions in most cases for the requirement in border, at this time if subjected to high pressure interference or lightning stroke will cause entirely
Circuit especially control circuit is damaged.
As a result, it is necessary to seek a kind of single-wire communication Bus isolation protection circuit, under the conditions of realizing complicated use environment
Lightning protection overvoltage protection.
Invention content
It in view of this, can be to single-wire communication bus the present invention provides a kind of two-way isolation circuit of single-wire communication bus
Two-way Phototube Coupling is carried out, realizes that one kind can be with the jamproof single-wire communication bus of lightning protection.
The embodiment of one aspect of the present invention provides a kind of two-way isolation circuit of single-wire communication bus, which is：
Including control circuit, the first bus driver, optocoupler, the second bus driver and single wire bus device and enable
Circuit.
Control circuit connects the first bus driver.
First bus driver connects the second bus driver by optocoupler.
Second bus driver connects single wire bus device.
Further, the output of control circuit includes communication signal and enable signal.
First bus driver includes a first input end, two the first output terminals and first Enable Pin.
Wherein communication signal is linked into the first input end of the first bus driver；Enable signal is linked into the drive of the first bus
First Enable Pin of dynamic device.
Optocoupler, which has the first isolation input output port, is isolated, the second isolation input output port pair and third
Input/output port pair；The first output terminal of two of which be respectively connected to the first and second isolation input output port centerings every
From input port；Enable signal accesses the isolation input port of third isolation input output port centering by phase inverter.
Second bus driver includes two the second input terminals, a second output terminal and second Enable Pin.
The isolation output port of wherein the first and second isolation input output port centerings connects two second inputs respectively
End.
The isolation output port of third isolation input output port centering connects the second Enable Pin.
Second output terminal connects single wire bus device.
Further, single wire bus device quantity for one or more than one.
Further, optical coupling isolator is divided into isolation input part and isolation output par, c
First bus driver and the independently-powered in isolation input part
Second bus driver is independently-powered with output par, c is isolated.
Advantageous effect：
The present invention by bus driver device to communication line fractionation with merge coordinate optocoupler unidirectional photoelectricity every
From, and then the two-way insulation blocking to single-wire communication bus is realized, such isolation circuit improves making for single-wire communication bus
With safety and can meet the needs of single-wire communication bus apparatus uses under complex environment.
Description of the drawings
Fig. 1 is the schematic diagram of the two-way isolation circuit of single-wire communication bus；
Fig. 2 is the design principle figure of the two-way isolation circuit of single-wire communication bus.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
It please refers to Fig.1, Fig. 1 shows the signal of the two-way isolation circuit of single-wire communication bus provided in an embodiment of the present invention
Figure, as shown in Figure 1, the two-way isolation circuit of single-wire communication bus includes control circuit, the first bus driver, optocoupler, the
Two lines bus driver and single wire bus device and enabled circuit.As shown in Figure 1, by control circuit CPU the first bus drivers of connection,
Communication signal is divided into two-way by the first bus driver, and the first bus driver connects the second bus driver by optocoupler
Two-way is merged into all the way and is connected to single wire bus device by device, the second bus driver.Single wire bus device quantity for one or
More than one.
It please refers to Fig.2, Fig. 2 gives the design principle figure of the two-way isolation circuit of single-wire communication bus.As shown in Fig. 2, its
In, control circuit CPU sends out two kinds of signals, and one kind is communication signal, and one kind is enable signal.First bus driver includes one
A first input end, two the first output terminals and first Enable Pin.Communication signal is led to by the control circuit CPU single lines drawn
Communication interface is linked into the first input end of the first bus driver, by the first bus driver be divided into two-way and by two it is first defeated
Outlet inputs.What the enable signal interface that enable signal is drawn by control circuit CPU was linked into the first bus driver first makes
It can end.
Optocoupler has three pairs of input/output ports, and to two-way communication signal and all the way, enable signal carries out photoelectricity respectively
Isolation, respectively the first isolation input output port export, the second isolation input output port pair and third isolation input
Port pair.The first output terminal of two of which is respectively connected to the isolation input end of the first and second isolation input output port centerings
Mouthful, complete the unidirectional Phototube Coupling to communication signal.Enable signal accesses third isolation input output port pair by phase inverter
In isolation input port, complete the unidirectional Phototube Coupling to enable signal.
Such as Fig. 2, it is enabled that the second bus driver includes two the second input terminals, a second output terminal and one second
End.It is exported respectively by the isolation of the first and second isolation input output port centerings via the two-way communication line of optical coupling isolator
Port connects two the second input terminals respectively, completes the unidirectional Phototube Coupling to communication signal.Third isolation input output port
The isolation output port of centering connects the second Enable Pin, completes the unidirectional Phototube Coupling to enable signal.Second bus driver
Two-way circuit is merged into and connects single wire bus device all the way and by second output terminal.
Phase inverter in enable signal circuit plays the role of simultaneously turning on and ends two-way communication signal, realizes communication letter
Number timesharing bidirectional transmit-receive.Concrete mode is：When control circuit CPU is to single wire bus device transmission data information, enable signal is given
Go out, be at this time high-impedance state by remaining unimpeded link of the communication link of control circuit CPU to single wire bus device；Control circuit CPU connects
When receiving the data information that single wire bus device is sent, enable signal is closed, at this time by single wire bus device to the communication of control circuit CPU
Remaining unimpeded link of link is high-impedance state, ensure that the communication robust in the case of Phototube Coupling.
Optical coupling isolator is divided into isolation input part and isolation output par, c.First bus driver and isolation input portion
It is point independently-powered, such as scheme, by VCCA, circuit, first bus driver and homonymy optocoupler are powered in order to control.Second bus
Driver is independently-powered with output par, c is isolated, and such as schemes, and is single wire bus device, second bus driver and same sidelight by VCCB
Coupling is powered.
In conclusion the foregoing is merely a prefered embodiment of the invention, it is not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in the present invention's
Within protection domain.
Claims (4)
1. a kind of two-way isolation circuit of single-wire communication bus, which is characterized in that including control circuit, the first bus driver, light
Coupling device, the second bus driver and single wire bus device；
The control circuit connects first bus driver；
First bus driver connects the second bus driver by optocoupler；
Second bus driver connects the single wire bus device.
2. isolation circuit as described in claim 1, which is characterized in that the output of the control circuit include communication signal and
Enable signal；
First bus driver includes a first input end, two the first output terminals and first Enable Pin；
Wherein described communication signal is linked into the first input end of first bus driver；The enable signal is linked into institute
State the first Enable Pin of the first bus driver；
The optocoupler, which has the first isolation input output port, is isolated, the second isolation input output port pair and third
Input/output port pair；Wherein described two first output terminals are respectively connected to the first and second isolation input output port centerings
Isolation input port；The enable signal accesses the isolation input end of third isolation input output port centering by phase inverter
Mouthful；
Second bus driver includes two the second input terminals, a second output terminal and second Enable Pin；
The isolation output port of wherein the first and second isolation input output port centerings connects described two second inputs respectively
End；
The isolation output port of third isolation input output port centering connects second Enable Pin；
The second output terminal connects single wire bus device.
3. isolation circuit as claimed in claim 2, which is characterized in that the single wire bus device quantity for one or one with
On.
4. isolation circuit as claimed in claim 2, which is characterized in that the optical coupling isolator be divided into isolation input part and
Output par, c is isolated；
First bus driver and the isolation input part are independently-powered；
Second bus driver with described that output par, c is isolated is independently-powered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711435296.XA CN108173543A (en) | 2017-12-26 | 2017-12-26 | A kind of two-way isolation circuit of single-wire communication bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711435296.XA CN108173543A (en) | 2017-12-26 | 2017-12-26 | A kind of two-way isolation circuit of single-wire communication bus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108173543A true CN108173543A (en) | 2018-06-15 |
Family
ID=62521619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711435296.XA Pending CN108173543A (en) | 2017-12-26 | 2017-12-26 | A kind of two-way isolation circuit of single-wire communication bus |
Country Status (1)
| Country | Link |
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| CN (1) | CN108173543A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112368587A (en) * | 2018-12-06 | 2021-02-12 | Ansys Lumerical知识产权有限责任公司 | System and method for creating a single-port interface for simulating bi-directional signals in a circuit using available circuit simulation standards |
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|---|---|---|---|---|
| CN1361949A (en) * | 1999-07-19 | 2002-07-31 | 汤姆森许可贸易公司 | Electrical insulation device with optocoupler for bidirectional connecting lines |
| CN101345629A (en) * | 2008-08-21 | 2009-01-14 | 武汉科技大学 | Double on-site bus interface converter |
| CN101470151A (en) * | 2007-12-26 | 2009-07-01 | 联创汽车电子有限公司 | CAN bus isolation circuit |
| CN102014139A (en) * | 2010-12-09 | 2011-04-13 | 北京交通大学 | Protocol conversion device for vehicle FlexRay bus and Ethernet |
| CN202309703U (en) * | 2011-10-26 | 2012-07-04 | 成都力拓电控技术有限公司 | Signal repeater controlled by hydraulic support bus |
| CN202661799U (en) * | 2012-05-10 | 2013-01-09 | 珠海格力电器股份有限公司 | Inter-board communication network control circuit device and air conditioner outdoor unit control circuit apparatus |
| CN104579474A (en) * | 2014-12-29 | 2015-04-29 | 东莞市启鼎光电科技有限公司 | Passive optical splitter RS-485 optical fiber bus embedded terminal |
| CN105141491A (en) * | 2015-09-23 | 2015-12-09 | 杭州得诚电力科技有限公司 | RS485 communication circuit capable of achieving self-sending and self-receiving and method |
-
2017
- 2017-12-26 CN CN201711435296.XA patent/CN108173543A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1361949A (en) * | 1999-07-19 | 2002-07-31 | 汤姆森许可贸易公司 | Electrical insulation device with optocoupler for bidirectional connecting lines |
| CN101470151A (en) * | 2007-12-26 | 2009-07-01 | 联创汽车电子有限公司 | CAN bus isolation circuit |
| CN101345629A (en) * | 2008-08-21 | 2009-01-14 | 武汉科技大学 | Double on-site bus interface converter |
| CN102014139A (en) * | 2010-12-09 | 2011-04-13 | 北京交通大学 | Protocol conversion device for vehicle FlexRay bus and Ethernet |
| CN202309703U (en) * | 2011-10-26 | 2012-07-04 | 成都力拓电控技术有限公司 | Signal repeater controlled by hydraulic support bus |
| CN202661799U (en) * | 2012-05-10 | 2013-01-09 | 珠海格力电器股份有限公司 | Inter-board communication network control circuit device and air conditioner outdoor unit control circuit apparatus |
| CN104579474A (en) * | 2014-12-29 | 2015-04-29 | 东莞市启鼎光电科技有限公司 | Passive optical splitter RS-485 optical fiber bus embedded terminal |
| CN105141491A (en) * | 2015-09-23 | 2015-12-09 | 杭州得诚电力科技有限公司 | RS485 communication circuit capable of achieving self-sending and self-receiving and method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112368587A (en) * | 2018-12-06 | 2021-02-12 | Ansys Lumerical知识产权有限责任公司 | System and method for creating a single-port interface for simulating bi-directional signals in a circuit using available circuit simulation standards |
| CN112368587B (en) * | 2018-12-06 | 2023-10-24 | Ansys 公司 | System and method for creating a single port interface for simulating a bi-directional signal in a circuit using available circuit simulation standards |
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Application publication date: 20180615 |