CN101557293A - Optoelectronic isolator with serial communication interface - Google Patents
Optoelectronic isolator with serial communication interface Download PDFInfo
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- CN101557293A CN101557293A CNA2008100359220A CN200810035922A CN101557293A CN 101557293 A CN101557293 A CN 101557293A CN A2008100359220 A CNA2008100359220 A CN A2008100359220A CN 200810035922 A CN200810035922 A CN 200810035922A CN 101557293 A CN101557293 A CN 101557293A
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- serial communication
- isolation
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Abstract
The invention relates to an optoelectronic isolator with a serial communication interface. The optoelectronic isolator comprises a shell, a circuit board, a wiring terminal, an optoelectronic isolation circuit, a DC/DC power isolation circuit, an interface protection circuit, a power protection circuit and an LED indicating lamp, wherein the optoelectronic isolation circuit, the DC/DC power isolation circuit, the interface protection circuit, the power protection circuit, the LED indicating lamp and the wiring terminal are fixed on the circuit board which is fixed in the shell. Compared with the prior art, the invention is particularly used to the applied environments of railroad and subway signal system sites, can effectively isolate intense electromagnetic interference from lightning strike, static, and the like generated by exterior or opponent equipment, conforms to special site requirement of industry and particularly has the advantages of good optoelectronic isolation effect, long performance, good stability, convenient installation and use, and the like.
Description
Technical field
The present invention relates to a kind of photoisolator, particularly a kind of optoelectronic isolator with serial communication interface.
Background technology
In railway, subway signal system, tend to run into the situation of point-to-point connection between a plurality of equipment, the point-to-point interconnection of often seeing at present has some serial communication interfaces such as RS232, RS422, RS485 and HDLC.Because when two equipment of different voltage differences link together, unsettled voltage can form " circulation ", and causes huge electric current between many serial equipments, causes the equipment damage.For example, previously in railway signal mechanical room, (between two industrial computers) point-to-point interconnected between the equipment adopts the RS232 serial line interface sometimes, and the situation that the RS232 interface burns out takes place often, also can cause the damage of machine intimate circuit board sometimes.
In addition, in the environment of strong electromagnetic, interference signal can be conducted between the equipment of two point-to-point connections by electric wire, the crosstalk phenomenon between the initiation equipment.A typical example is in railway TDCS (TDCS) system, and the station extension set adopts with wireless running number equipment that RS422 is point-to-point to be connected, and wireless running number equipment then utilizes external antenna to receive the wireless signal that sends over from engine.When thunderbolt weather occurring, be easy to occur thunder and lightning and disturb and import wireless running number equipment into, and then be transmitted to the situation of station extension set by the RS422 connecting line by antenna, cause the circuit board damage of station extension set.Because during beginning this thunder disaster is lacked enough understanding, station extension set damaged condition is more serious.The RS422 optoelectronic isolator with serial communication interface is exactly the centre that is connected on station extension set and wireless running number equipment, and electromagnetic interference such as thunderbolt plays the effect of an isolation to external world, and protection station extension set is avoided damaging.
The operation principle of photoisolator is changed the signal of telecommunication and light signal by photoelectric isolated chip mutually in isolator inside exactly, isolate electromagnetic interference such as the earth potential at two ends and thunder and lightning fully, such result makes the equipment at photoisolator two ends obtain isolation on electric, prevents the generation of " circulation " and the mutual conduction of electromagnetic interference.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of electrical isolation effective optoelectronic isolator with serial communication interface for the defective that overcomes above-mentioned prior art existence.
Purpose of the present invention can be achieved through the following technical solutions: a kind of optoelectronic isolator with serial communication interface; this photoisolator comprises shell, circuit board, binding post; it is characterized in that; also comprise photoelectric isolating circuit, DC/DC power isolation circuit, interface protective circuit, power protecting circuit, LED light; described photoelectric isolating circuit, DC/DC power isolation circuit, interface protective circuit, power protecting circuit, LED light, binding post are fixed on the circuit board, and this circuit board is fixing in the enclosure.
Described LED light comprises 3, is respectively POWER, TX, RX indicator light.
Compared with prior art, the present invention is especially at the applied environment of railway, subway signal system for field, effective strong electromagnetic such as isolating exterior or the thunderbolt that method, apparatus is produced, static, meet the special field requirement of industry, especially have the characteristics that electrical isolation is effective, the performance long-time stability are good, easy to install.
Description of drawings
Fig. 1 is the structural representation of a kind of optoelectronic isolator with serial communication interface of the present invention;
Fig. 2 is the wiring schematic diagram of a kind of optoelectronic isolator with serial communication interface of the present invention.
Embodiment
As shown in Figure 1; the invention provides a kind of optoelectronic isolator with serial communication interface; this photoisolator comprises shell, circuit board, binding post, photoelectric isolating circuit, DC/DC power isolation circuit, interface protective circuit, power protecting circuit, LED light; described photoelectric isolating circuit, DC/DC power isolation circuit, interface protective circuit, power protecting circuit, LED light, binding post are fixed on the circuit board, and this circuit board is fixing in the enclosure.Described LED light comprises 3, is respectively POWER, TX, RX indicator light.
The present invention is used for carrying out between two equipment the electrical isolation of serial ports when interconnected.Say that from technical standpoint the selection of power supply DC/DC isolation module is very big to the performance impact of overall optical electric isolator.Most on the market at present bussiness class photoisolators are considered for cost and volume two aspects, the volume of some power supply DC/DC isolation module is very little, integrated level is very high, the result causes that isolation voltage stability is not enough, isolation voltage is on the low side, the back temperature that works long hours is crossed problems such as height, can have influence on the communication quality between the equipment when reality is used.The power supply DC/DC isolation module that we select for use, isolation voltage more than 2500V, stable work in work; Some photoisolator adopts the mode of port power taking, and the shortcoming of this method is to cause the instability of isolator operating voltage sometimes.We adopted directly+the 5V supply power mode in when design, and reverse input protection circuit is arranged, and when the careless wrong power supply terminal of user, can protect internal circuit can not burn; The emi protection of the fewer consideration terminals of general photoisolator, and for our applied environment, anti-electromagnetic interference is a big main task of photoisolator, therefore when the design photoisolator, has increased TVS pipe and ground connection discharge channel.
At the applied environment of railway, subway signal system for field, effectively strong electromagnetic such as isolating exterior or the thunderbolt that method, apparatus is produced, static meets the special field requirement of industry especially in the present invention.
Shell of the present invention adopts Plastic Package, and three indicator lights are arranged above the shell of photoisolator, and wherein the left side is power supply indicator (green), and the centre is TX indicator light (red), and the right is RX indicator light (green).Increase this three LED light, be convenient to the field personnel and judge whether the data transmit-receive on the passage is normal.Be printed on company's icon, Business Name and name of product at outer casing frontispiece.In the top position of shell, the binding post of four GMKDS1.5/2-7.62 specifications is arranged, be labeled as respectively: RA, RB, TAO and TBO.At the lower position of shell, the binding post of six GMKDS 1.5/2-7.62 specifications is arranged, as shown in Figure 2, be labeled as respectively: TA, TB, RAO, RBO, GND and+5V.The use example is as follows:
Use example:
1, RA, RB connect the positive and negative end of outside input differential signal respectively, and TAO, TBO connect the positive and negative end of output signal respectively.
2 ,+and 5V, GND connect the positive and negative end of this locality+5V DC power supply, and TA, TB connect the positive and negative terminal of local reception interface, and RAO, RBO connect the positive and negative terminal of local transmission interface.
For example: in railway TDCS system, the data of RA and order of RB receiving scheduling or wireless train number; TAO and TBO send the data of dispatching command.
For example: in railway TDCS system, TA connects " RX+ " end that local NPC goes up RS422, and TB connects " RX-" end that NPC goes up the RS422 receiving port; RAO meets local NPC and goes up that RS422 sends mouthful " TX+ " end, RBO meets NPC and goes up that RS422 sends mouthful " TX-" end; + 5V connects and draws on the local busbar "+5V ", GND connects the direct current ground that draws on the local busbar.
Claims (2)
1. optoelectronic isolator with serial communication interface; this photoisolator comprises shell, circuit board, binding post; it is characterized in that; also comprise photoelectric isolating circuit, DC/DC power isolation circuit, interface protective circuit, power protecting circuit, LED light; described photoelectric isolating circuit, DC/DC power isolation circuit, interface protective circuit, power protecting circuit, LED light, binding post are fixed on the circuit board, and this circuit board is fixing in the enclosure.
2. a kind of optoelectronic isolator with serial communication interface according to claim 1 is characterized in that described LED light comprises 3, is respectively POWER, TX, RX indicator light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100359220A CN101557293A (en) | 2008-04-10 | 2008-04-10 | Optoelectronic isolator with serial communication interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100359220A CN101557293A (en) | 2008-04-10 | 2008-04-10 | Optoelectronic isolator with serial communication interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101557293A true CN101557293A (en) | 2009-10-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100359220A Pending CN101557293A (en) | 2008-04-10 | 2008-04-10 | Optoelectronic isolator with serial communication interface |
Country Status (1)
| Country | Link |
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| CN (1) | CN101557293A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199853A (en) * | 2013-03-19 | 2013-07-10 | 启东文鑫电子有限公司 | Optoelectronic isolation protector |
| CN106210660A (en) * | 2016-08-30 | 2016-12-07 | 南京双京电器集团有限公司 | A kind of underground coal mine video camera and monitoring system |
-
2008
- 2008-04-10 CN CNA2008100359220A patent/CN101557293A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199853A (en) * | 2013-03-19 | 2013-07-10 | 启东文鑫电子有限公司 | Optoelectronic isolation protector |
| CN106210660A (en) * | 2016-08-30 | 2016-12-07 | 南京双京电器集团有限公司 | A kind of underground coal mine video camera and monitoring system |
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Open date: 20091014 |