CN201270567Y - Balance transmitter with isolation circuit - Google Patents
Balance transmitter with isolation circuit Download PDFInfo
- Publication number
- CN201270567Y CN201270567Y CNU2008202078392U CN200820207839U CN201270567Y CN 201270567 Y CN201270567 Y CN 201270567Y CN U2008202078392 U CNU2008202078392 U CN U2008202078392U CN 200820207839 U CN200820207839 U CN 200820207839U CN 201270567 Y CN201270567 Y CN 201270567Y
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- China
- Prior art keywords
- circuit
- receiver
- reflector
- isolation
- buffer circuit
- 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.)
- Expired - Fee Related
Links
- 238000002955 isolation Methods 0.000 title claims abstract description 29
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 230000001681 protective effect Effects 0.000 claims description 22
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 230000003287 optical effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 2
- 101100489717 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND2 gene Proteins 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The utility model discloses a balanced transmitter with an isolation circuit in the transmission application of video baseband signal cables, which consists of a front-end transmitter and a rear-end receiver, wherein the transmitter comprises an amplifying driving circuit, an isolation protection circuit and a driving conversion circuit; the receiver comprises a conversion amplifying circuit, an isolation protection circuit and an amplifying circuit, wherein the transmitter and the receiver are connected by a twisted pair, and the isolation circuit adopts a broadband transformer or a high-speed optical coupler. The isolation circuit can effectively prevent the ground voltage from damaging elements in the transmitter circuit or the receiver circuit through the ground loop, and the isolation protection circuit can avoid the damage of the high voltage to the isolation circuit.
Description
Technical field
The utility model relates to field of signal transmissions, relates in particular to the video signal transmission field.
Background technology
In the video baseband signal cable transmission is used, a kind of balance transmission device is arranged, be used for the transmission of video baseband signal, it is the differential signal that unbalanced vision signal is transformed into balance through reflector, be transferred to receiver end by twisted-pair feeder, be transformed into unbalanced vision signal by receiver, deliver to terminal equipments such as monitor, because the balance transmission device adopts " virtual earth " mode to transmit, before, the earth-return that the rear end connects is the ground by reflector, the circuit of reflector, twisted-pair feeder, the circuit of receiver, the ground of receiver constitutes, current, when epd appearred in the rear end, ground voltage will be by above-mentioned loop with the component wear in transmitter circuit or the acceptor circuit.
Summary of the invention
The utility model is for overcoming above-mentioned the deficiencies in the prior art; a kind of balance transmission device that has buffer circuit and isolation protective circuit is provided; prevent that ground voltage from damaging element in transmitter circuit or the acceptor circuit by earth-return, avoids the damage of high voltage to buffer circuit simultaneously.
The technical scheme that the utility model solves the problems of the technologies described above is:
A kind of balance transmission device with buffer circuit, it is made up of front end emission device and back end-receiver, reflector comprises amplification driving circuit, drives change-over circuit, receiver comprises converter amplifier circuit, amplifying circuit, connected by twisted-pair feeder between reflector and the receiver, reflector or receiver are provided with buffer circuit and isolation protective circuit; Perhaps reflector and receiver all are provided with buffer circuit and isolation protective circuit, and this buffer circuit adopts wide-band transformer or high-speed light coupling device.
Technique effect of the present utility model is: in balance transmission device reflector buffer circuit is housed, the amplification driving circuit and the driving change-over circuit of reflector can be isolated; In balance transmission device receiver, buffer circuit is housed, the converter amplifier circuit and the amplifying circuit of receiver can be isolated, prevent that like this ground voltage is by the element in earth-return damage transmitter circuit or the acceptor circuit; It is to be used to protect buffer circuit that the isolation protective circuit purpose is housed in the balance transmission device, prevents the damage of high voltage to buffer circuit.
Description of drawings:
Fig. 1 is the utility model frame principle figure;
Fig. 2 is the circuit theory diagrams of embodiment 1
Fig. 3 is the circuit theory diagrams of embodiment 2
Fig. 4 is the circuit theory diagrams of embodiment 3
Fig. 5 is the circuit theory diagrams of embodiment 4
Fig. 6 is the circuit theory diagrams of embodiment 5
Fig. 7 is the circuit theory diagrams of embodiment 6
Embodiment
Be elaborated below in conjunction with embodiment and accompanying drawing:
As shown in Figure 1, vision signal is delivered to reflector 1 amplification driving circuit 1-1, vision signal is after amplifying, through buffer circuit 1-2 transfer to drive change-over circuit 1-3 amplify drive and conversion after conversion of signals is become differential signal, send into twisted-pair feeder again, through delivering to the converter amplifier circuit 2-1 of receiver after the twisted-pair feeder transmission, differential signal is transformed into unbalanced signal after buffer circuit 2-2 transfers to outputting video signal behind the amplifying circuit 2-3; As shown in Figure 2, connect by isolation protective circuit 1-4 between the ground GND1 of front end emission device 1 and the GND2, connect by isolation protective circuit 2-4 between the ground GND1 of back end-receiver 2 and the GND2.In Fig. 1, buffer circuit 1-2 and 2-2 adopt wide-band transformer or high-speed light coupling device; Isolation protective circuit 1-4 and 2-4 can be discharge tubes, it also can be the transient state suppressing pipe, the normally not conducting of this protective circuit, have only when occurring very high voltage (as sensing lightning voltage) between the buffer circuit, this circuit turn-on, discharge high voltage by this circuit, the protection buffer circuit does not damage, and reaches the purpose of isolating the front and back ends ground voltage like this; 1-1 can adopt broadband operational amplifier, also can adopt transistor, and it offers the enough drive currents of buffer circuit 1-2, guarantees from the vision signal of buffer circuit 1-2 output certain amplitude.
Embodiment 3 as shown in Figure 4, this embodiment with the difference of embodiment 1 is: have only reflector 1 to be provided with buffer circuit 1-2 and isolation protective circuit 1-4, receiver 2 is not provided with buffer circuit and isolation protective circuit, this buffer circuit 1-2 adopts high-speed light coupling device equally.
Embodiment 4 as shown in Figure 5, this embodiment with the difference of embodiment 1 is: have only receiver 2 to be provided with buffer circuit 2-2 and isolation protective circuit 2-4, reflector 1 is not provided with buffer circuit and isolation protective circuit, this buffer circuit 2-2 adopts high-speed light coupling device equally.
Embodiment 5 as shown in Figure 6, this embodiment with the difference of embodiment 2 is: have only reflector 1 to be provided with buffer circuit 1-2 and isolation protective circuit 1-4, receiver 2 is not provided with buffer circuit and isolation protective circuit, and this buffer circuit 1-2 adopts wide-band transformer equally.
Embodiment 6 as shown in Figure 7, this embodiment with the difference of embodiment 2 is: have only receiver 2 to be provided with buffer circuit 2-2 and isolation protective circuit 2-4, reflector 1 is not provided with buffer circuit and isolation protective circuit, and this buffer circuit 2-2 adopts wide-band transformer equally.
Claims (3)
1, a kind of balance transmission device with buffer circuit; it is made up of front end emission device and back end-receiver; reflector comprises amplification driving circuit, drives change-over circuit; receiver comprises converter amplifier circuit, amplifying circuit; connected by twisted-pair feeder between reflector and the receiver, it is characterized in that: reflector and receiver all are provided with buffer circuit and isolation protective circuit.
2, a kind of balance transmission device with buffer circuit; it is made up of front end emission device and back end-receiver; reflector comprises amplification driving circuit, drives change-over circuit; receiver comprises converter amplifier circuit, amplifying circuit; connected by twisted-pair feeder between reflector and the receiver, it is characterized in that: reflector or receiver are provided with buffer circuit and isolation protective circuit.
3, a kind of balance transmission device with buffer circuit according to claim 1 and 2 is characterized in that: described buffer circuit is wide-band transformer or high-speed light coupling device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202078392U CN201270567Y (en) | 2008-07-30 | 2008-07-30 | Balance transmitter with isolation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202078392U CN201270567Y (en) | 2008-07-30 | 2008-07-30 | Balance transmitter with isolation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201270567Y true CN201270567Y (en) | 2009-07-08 |
Family
ID=40843176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202078392U Expired - Fee Related CN201270567Y (en) | 2008-07-30 | 2008-07-30 | Balance transmitter with isolation circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201270567Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102314761A (en) * | 2010-07-05 | 2012-01-11 | 亿尚精密工业股份有限公司 | Signal transmission circuit |
| CN104270129A (en) * | 2014-09-26 | 2015-01-07 | 永济新时速电机电器有限责任公司 | IGBT driving receiving and fault feedback circuit of converter |
-
2008
- 2008-07-30 CN CNU2008202078392U patent/CN201270567Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102314761A (en) * | 2010-07-05 | 2012-01-11 | 亿尚精密工业股份有限公司 | Signal transmission circuit |
| CN104270129A (en) * | 2014-09-26 | 2015-01-07 | 永济新时速电机电器有限责任公司 | IGBT driving receiving and fault feedback circuit of converter |
| CN104270129B (en) * | 2014-09-26 | 2017-08-11 | 永济新时速电机电器有限责任公司 | A kind of IGBT drivings of current transformer are received and fault feedback circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090708 Termination date: 20110730 |