CN2694618Y - Photoelectric isolation active constant current signal converter - Google Patents
Photoelectric isolation active constant current signal converter Download PDFInfo
- Publication number
- CN2694618Y CN2694618Y CN 200420031398 CN200420031398U CN2694618Y CN 2694618 Y CN2694618 Y CN 2694618Y CN 200420031398 CN200420031398 CN 200420031398 CN 200420031398 U CN200420031398 U CN 200420031398U CN 2694618 Y CN2694618 Y CN 2694618Y
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- Prior art keywords
- digital signal
- circuit
- output
- constant current
- signal
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- 238000002955 isolation Methods 0.000 title abstract description 3
- 230000008878 coupling Effects 0.000 claims abstract description 10
- 238000010168 coupling process Methods 0.000 claims abstract description 10
- 238000005859 coupling reaction Methods 0.000 claims abstract description 10
- 230000005622 photoelectricity Effects 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 abstract description 11
- 230000008054 signal transmission Effects 0.000 abstract description 4
- 230000005693 optoelectronics Effects 0.000 abstract 2
- 238000004891 communication Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The utility model relates to a digital signal transmission equipment, especially a photoelectric isolation active constant current signal converter, it includes: the output end of the photoelectric coupling circuit for receiving the computer input digital signal is connected with the input end of the circuit for converting the switching value into the active constant current digital signal, and the output end of the circuit is connected with the input end of the digital signal output photoelectric coupling circuit. Compared with the prior art, the utility model, owing to utilize power amplifier circuit, directly convert optoelectronic coupler's coupling output signal to active constant current loop signal and transmit for a series of technical measure such as digital signal output optoelectronic coupling output to there is transmission distance far away, stable performance is reliable, obviously improves the driving force of signal through experimental proof, increases advantages such as bandwidth rate, is the converter or the repeater of remote digital signal transmission first-selected.
Description
The utility model relates to a kind of digital data transmission equipment, and particularly a kind of photoelectricity is isolated active constant current signal transducer, is first-selected transducer or the repeater of remote digital signal transmission.
Background technology
The development of advancing by leaps and bounds along with computer technology, interface circuit and similar products like thereof as computer serial communication are a lot, the standard serial communication interface has RS232, RS422, RS485,20mA electric current loop etc., however, but its transmission range is more limited, wherein the communication of transmission range RS485 farthest will realize remote transfer of data apart from being 1200M, must on the position that is no more than 1200M at interval the repeater with same transfer function be installed.Though reached the purpose of digital signal long-distance transmissions like this, transmission means in the past exists such as failure rate height, shortcoming not fully up to expectations such as the distortion of signal transmitted waveform is big, the error rate is high and communication baud rate is low.Although this has caused the concern of the parties concerned, up to the present also still find no successfully the report that solves, have only helplessly the traditional approach of continuing to use year after year to carry out the long distance transmission.
The utility model content
The purpose of this utility model is to provide transmission range 7000M under a kind of simple in structure, situation that transmission range in baud rate is 1200bps, it is stable and reliable for performance, obviously improve the driving force of signal, strengthen bandwidth, reduce the error rate, and then the photoelectricity of raising signal transfer quality is isolated active constant current signal transducer.
The technical scheme of the utility model technical solution problem comprises: the output that receives the photoelectricity coupling circuit of TTL supplied with digital signal links to each other with the input that switching value is transformed into active constant current digital signal circuit, and the output of this circuit links to each other with the input of digital signal output photoelectricity coupling circuit.
Described switching value is transformed into the triode T in the active constant current digital signal circuit
1, T
2Base stage link to each other back and photoelectrical coupler U
14 pin and resistance R
2An end link to each other T
1With T
2Emitter link to each other T
2Collector electrode and resistance R
2The other end link to each other, pass through resistance R
3An end, and with recipient's resistance R
5An end link to each other resistance R
3The other end be plugged on T
1With T
2Emitter between, T
1Collector electrode and photoelectrical coupler U
15 pin and power supply V
Cc3Positive pole link to each other power supply V
Cc3Negative pole and photoelectrical coupler U
22 pin link to each other.
The utility model compared with prior art owing to utilize power amplification circuit, is directly changed into active continuous current ring signal to the coupling output signal of photoelectrical coupler and transmits, and has improved the driving force of signal effectively, has improved the signal of communication quality.And have long transmission distance, characteristics such as stable and reliable for performance through this technology of evidence.If want to transmit farther distance, can on the position that is no more than 7000M at interval, realize by this transducer of series connection.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is a circuit structure block diagram of the present utility model.。
Embodiment
The utility model further specifies content of the present utility model by embodiment.
Embodiment 1, digital signal photoelectricity coupling circuit are to be the TTL logic level transition current output signal, realize electrical isolation by photoelectrical coupler.Its input signal is sent into triode T
3Base stage, T
3Grounded collector, emitter links to each other with 2 pin of photoelectrical coupler, 1 pin of photoelectrical coupler is by current-limiting resistance R
1With power supply V
Cc1Link to each other, its output is used for the driving switch quantitative change and changes active constant current digital signal circuit into, the triode T in this circuit
1, T
2Base stage be plugged on photoelectrical coupler U after linking to each other
14 pin and resistance R
2An end between, T
1With T
2Emitter link to each other T
2Collector electrode and resistance R
2And resistance R
3An end and through resistance R
5With photoelectrical coupler U
21 pin link to each other resistance R
3The other end be connected on T
1With T
2Emitter between, T
1Collector electrode and photoelectrical coupler U
15 pin and power supply V
Cc3Positive pole link to each other power supply V
Cc3Negative pole and photoelectrical coupler U
22 pin link to each other its photoelectrical coupler U
24 pin ground connection, 5 steps are by pull-up resistor R
4With power supply V
Cc2Anodal linking to each other, 5 pin link to each other with Other Instruments, instrument serial communication interface TTL signal as the signal output lead end of TTL simultaneously.
The utility model is suitable for port and pier flow circuit measuring parameter and detects, distant signal transmission between realization instrument and meter and the control room and the various detecting instruments of plant area of petroleum chemical enterprise are to the remote transmission of the detected parameters between the Control Room, during use when input low level, triode T
3Conducting, photoelectrical coupler U
1Conducting makes conducting between pin 4 and the pin 5, and constant-current circuit has constant current output, receiving terminal photoelectrical coupler U
2Conducting, output pin 5 output low levels; When the transmitting terminal input high level, triode T
3End photoelectrical coupler U
1End, this moment, constant-current circuit ended, no current output, and the output photoelectrical coupler also ends, output pin 5 output high level.
Claims (2)
1, a kind of photoelectricity is isolated active constant current signal transducer, it is characterized in that it comprises: the output that receives the photoelectricity coupling circuit of TTL supplied with digital signal links to each other with the input that switching value is transformed into active constant current digital signal circuit, and the output of this circuit links to each other with the input of digital signal output photoelectricity coupling circuit.
2, transducer according to claim 1 is characterized in that described switching value is transformed into the triode T in the active constant current digital signal circuit
1, T
2Base stage link to each other back and photoelectrical coupler U
14 pin and resistance R
2An end link to each other T
1With T
2Emitter link to each other T
2Collector electrode and resistance R
2The other end link to each other, and pass through resistance R
3An end and recipient's resistance R
5An end link to each other resistance R
3The other end be connected on T
1With T
2Emitter between, T
1Collector electrode and photoelectrical coupler U
15 pin and power supply V
Cc3Positive pole link to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420031398 CN2694618Y (en) | 2004-04-30 | 2004-04-30 | Photoelectric isolation active constant current signal converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420031398 CN2694618Y (en) | 2004-04-30 | 2004-04-30 | Photoelectric isolation active constant current signal converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2694618Y true CN2694618Y (en) | 2005-04-20 |
Family
ID=34772425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420031398 Expired - Fee Related CN2694618Y (en) | 2004-04-30 | 2004-04-30 | Photoelectric isolation active constant current signal converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2694618Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100346363C (en) * | 2005-09-08 | 2007-10-31 | 广州汉为电子科技有限公司 | Passive electromagnetic isolated signal converter |
| CN1975087B (en) * | 2006-12-15 | 2010-08-25 | 浙江吉利汽车研究院有限公司 | Controller for vehicle automatic gull wing door |
| CN102045153A (en) * | 2010-11-03 | 2011-05-04 | 苏州合欣美电子科技有限公司 | Half-duplex three-wire system communication circuit |
-
2004
- 2004-04-30 CN CN 200420031398 patent/CN2694618Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100346363C (en) * | 2005-09-08 | 2007-10-31 | 广州汉为电子科技有限公司 | Passive electromagnetic isolated signal converter |
| CN1975087B (en) * | 2006-12-15 | 2010-08-25 | 浙江吉利汽车研究院有限公司 | Controller for vehicle automatic gull wing door |
| CN102045153A (en) * | 2010-11-03 | 2011-05-04 | 苏州合欣美电子科技有限公司 | Half-duplex three-wire system communication circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |