CN210578884U - Multi-signal transmission circuit based on network cable - Google Patents
Multi-signal transmission circuit based on network cable Download PDFInfo
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- CN210578884U CN210578884U CN201921634425.2U CN201921634425U CN210578884U CN 210578884 U CN210578884 U CN 210578884U CN 201921634425 U CN201921634425 U CN 201921634425U CN 210578884 U CN210578884 U CN 210578884U
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Abstract
The utility model relates to a many signal transmission circuit based on net twine, include: the first network cable interface, and a power control detection circuit and a first balun circuit which are connected with the first network cable interface; the second network cable interface is connected with the level conversion circuit, the matching circuit and the second balun circuit; and the network cable is connected with the first network cable interface and the second network cable interface, and comprises a first line for connecting the power supply control detection circuit, the level conversion circuit and the matching circuit, and a second line for connecting the first balun circuit and the second balun circuit, wherein the first line and the second line are twisted-pair lines in the same network cable. The multi-signal transmission circuit based on the network cable has the characteristics of simple wiring and safe use.
Description
Technical Field
The utility model relates to a video monitoring equipment field especially relates to a many signal transmission circuit based on net twine.
Background
The multi-signal transmission circuit based on the network cable simultaneously transmits audio signals, video signals, coaxial control signals and power signals in one network cable. The technology is used for engineering wiring, so that the cost is low, the installation is convenient, and the application prospect is good. For the image acquisition terminal supporting network cable power supply, the transmission circuit supplies power to the image acquisition terminal equipment after detection. For the image acquisition terminal which does not support network cable power supply, the transmission circuit can not output power supply voltage, so that the safety of the image acquisition terminal is protected.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a many signal transmission circuit based on net twine can be through the level that detects the access image acquisition front end, judges whether the equipment of access supports the net twine power supply, and the security is high.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a network cable based multi-signal transmission circuit comprising:
the first network cable interface, and a power control detection circuit and a first balun circuit which are connected with the first network cable interface;
the second network cable interface is connected with the level conversion circuit, the matching circuit and the second balun circuit;
and the network cable is connected with the first network cable interface and the second network cable interface, and comprises a power supply transmission line for connecting the power supply control detection circuit with the level conversion circuit and the matching circuit, and a mixed signal transmission line for connecting the first balun circuit with the second balun circuit, wherein the power supply transmission line and the mixed signal transmission line are different twisted wire pairs in the same network cable.
Furthermore, the power control detection circuit comprises a detection circuit, a control circuit and a switch circuit, the detection circuit is connected with the switch circuit and the first network cable interface, and the control circuit is respectively connected with the signal output end of the detection circuit and the switch circuit and is used for receiving the output signal of the detection circuit and controlling the on-off of the switch circuit.
Preferably, the switching circuit is a MOS transistor.
Furthermore, the multi-signal transmission circuit further comprises a power supply, the power supply is connected with the source electrode of the MOS tube, the signal output end of the control circuit is connected with the grid electrode of the MOS tube, and the power supply input end of the detection circuit is connected with the drain electrode of the MOS tube.
Furthermore, the multi-signal transmission circuit further comprises a mixed video processing circuit, wherein the mixed video processing circuit is connected with the first balun circuit, and is used for receiving, converting, storing or outputting the audio signal and the video signal and sending out the coaxial signal.
Preferably, the network cable interface is an RJ45 interface.
Furthermore, the multi-signal transmission circuit further comprises a video acquisition terminal, a power port of the video acquisition terminal is connected with the level conversion circuit, and a signal input/output port is connected with the second balun circuit.
The utility model has the advantages that:
the utility model provides a many signal transmission circuit based on net twine, including balun circuit, power control detection circuitry and net twine interface; the balun circuit is used for converting the differential signal into a single-ended audio, video and coaxial mixed signal or converting the single-ended signal mixed with the audio, video and coaxial into the differential signal; the network cable interface is used for connecting the balun circuit and the power supply control detection circuit with a network cable; the power supply control detection circuit is used for judging whether the image acquisition terminal supports network cable power supply or not by combining the matching circuit and controlling the on-off of a power supply of audio and video acquisition terminal equipment accessed through a network cable interface, so that the safety of the image acquisition terminal is protected. The utility model discloses a many signal transmission circuit based on net twine, in the in-service use, it is simple to have the wiring, characteristics safe in utilization, but the wide application is in video monitoring equipment.
Drawings
Fig. 1 is a block diagram of a multi-signal transmission circuit based on a network cable according to a first embodiment of the present invention.
Fig. 2 is a block diagram of a multi-signal transmission circuit based on network cables according to a second embodiment of the present invention.
Fig. 3 is a block diagram of a multi-signal transmission circuit based on network cables according to a third embodiment of the present invention.
Detailed Description
For further understanding of the present invention, preferred embodiments of the present invention will be described below with reference to examples, but it should be understood that these descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the claims of the present invention.
It should be noted that, hereinafter, the mixed signal refers to an analog signal including an audio signal, a video signal, and a coaxial signal.
Example 1
Fig. 1 is a block diagram of a multi-signal transmission circuit based on a network cable according to a first embodiment of the present invention, the circuit includes:
a first network cable interface and a second network cable interface, which is preferably an RJ45 interface.
The power supply control detection circuit and the first balun circuit are connected with the first network cable interface, and the level conversion circuit, the matching circuit and the second balun circuit are connected with the second network cable interface.
And the network cable is connected with the first network cable interface and the second network cable interface and comprises a power transmission line PB for connecting the power control detection circuit, the level conversion circuit and the matching circuit and a mixed signal transmission line PA for connecting the first balun circuit and the second balun circuit, wherein the power transmission line PB and the mixed signal transmission line PA are different twisted wire pairs in the same network cable.
In the circuit, the level conversion circuit, the matching circuit and the second balun circuit are used for being connected with a video acquisition terminal at the front end, and the power supply control detection circuit and the first balun circuit are used for being connected with a power supply at the rear end and the mixed video processing circuit.
The matching circuit is used for matching with the power supply control detection circuit to realize detection and identification of the image acquisition terminal. Specifically, after the matching circuit is connected with the image acquisition terminal and applies a certain voltage/current signal, the matching circuit feeds back the corresponding voltage/current signal and transmits the voltage/current signal to the power control detection circuit through the power transmission line PB, so that the power control detection circuit can determine whether the front end is accessed and whether the accessed image acquisition terminal supports network cable power supply according to the voltage/current signal fed back by the power control detection circuit, and further determine whether the accessed image acquisition terminal needs to be powered, thereby protecting the safety of the image acquisition terminal.
When power needs to be supplied to the accessed image acquisition terminal, the power control detection circuit is powered on and transmits the power to the level conversion circuit through the power transmission line PB, and the level conversion circuit converts the input power voltage into a voltage matched with the image acquisition terminal and outputs the voltage to the image acquisition terminal.
The second balun circuit is used for converting the single-ended mixed signal output by the image acquisition terminal into a differential mixed signal and inputting the differential mixed signal into the transmission line PA. And the other side of the first balun circuit is used for converting the differential mixed signal input by the transmission line PA into a single-ended mixed signal and further outputting the single-ended mixed signal to the mixed video processing circuit.
Above-mentioned the utility model discloses a many signal transmission circuit based on net twine of first embodiment through the direct current level parameter of detection and analysis net twine access mouth, can judge whether have image acquisition terminal to insert to whether the image acquisition terminal of further judging the access supports the net twine power supply, has the wiring convenience, the high advantage of security.
Example 2
Fig. 2 is a block diagram of a multi-signal transmission circuit based on network cables according to a second embodiment of the present invention. The basic structure is the same as the circuit in the first embodiment, and is not described in detail.
In this embodiment, the power control detection circuit includes a detection circuit, a control circuit and a switch circuit. The detection circuit is connected with the switch circuit and the first network cable interface, and the control circuit is respectively connected with the signal output end of the detection circuit and the switch circuit and used for receiving the output signal of the detection circuit and controlling the on-off of the switch circuit.
Specifically, the detection circuit is used for detecting a level parameter fed back by the matching circuit on the power transmission line PB accessed through the network cable interface, judging whether an image acquisition terminal is accessed, further judging whether the accessed acquisition terminal supports power supply through the range of the level parameter of the access port, and outputting a corresponding level parameter to the control circuit.
The control circuit determines a level signal output to the switch circuit according to the input level parameter, and the switch circuit performs on and off operations of the switch according to the input level signal.
The utility model discloses a many signal transmission circuit based on net twine of second embodiment through the direct current level parameter of detection and analysis net twine access mouth, can judge whether have image acquisition terminal to insert to whether the image acquisition terminal who further judges to insert supports the net twine power supply, and the security is high.
Example 3
Fig. 3 is a block diagram of a multi-signal transmission circuit based on network cables according to a third embodiment of the present invention. The basic structure is the same as the circuit in the second embodiment, and is not described in detail. On the basis of the second embodiment, a power supply, a mixed signal processing circuit and a video capture terminal are added in the embodiment.
As a preferred embodiment, the switching circuit in this embodiment is a MOS transistor. Furthermore, the multi-signal transmission circuit in this embodiment further includes a power supply, the power supply is connected to the source of the MOS transistor, the signal output terminal of the control circuit is connected to the gate of the MOS transistor, and the power input terminal of the detection circuit is connected to the drain of the MOS transistor.
The power supply is used for providing 48V direct current level signals, and the corresponding level conversion circuit is used for converting the 48V direct current level signals accessed through the power transmission line into 12V direct current level signals to supply power to the video acquisition terminal.
The mixed signal processing circuit is used for receiving, converting, storing and outputting the audio signal and the video signal output by the first balun circuit and sending out a coaxial signal.
The video acquisition terminal is used for acquiring audio signals and video signals and receiving coaxial signals.
The utility model discloses a many signal transmission circuit based on net twine of third embodiment has further integrated power supply, mixed signal processing circuit and video acquisition terminal, can regard as the whole to be applied to in the video monitoring equipment.
The above various implementation circuits may be implemented by those skilled in the art according to common knowledge through different device types and circuit connection modes, and are not illustrated here.
The above description of the embodiments is only intended to help understand the method of the present invention and its core ideas. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (7)
1. A network cable based multi-signal transmission circuit, comprising:
the first network cable interface, and a power control detection circuit and a first balun circuit which are connected with the first network cable interface;
the second network cable interface is connected with the level conversion circuit, the matching circuit and the second balun circuit;
and the network cable is connected with the first network cable interface and the second network cable interface, and comprises a power supply transmission line for connecting the power supply control detection circuit with the level conversion circuit and the matching circuit, and a mixed signal transmission line for connecting the first balun circuit with the second balun circuit, wherein the power supply transmission line and the mixed signal transmission line are different twisted wire pairs in the same network cable.
2. The network cable-based multi-signal transmission circuit as claimed in claim 1, wherein the power control detection circuit comprises a detection circuit, a control circuit and a switch circuit, the detection circuit is connected with the switch circuit and the first network cable interface, and the control circuit is respectively connected with the signal output end of the detection circuit and the switch circuit and is used for receiving the output signal of the detection circuit and controlling the on-off of the switch circuit.
3. The network cable based multi-signal transmission circuit as claimed in claim 2, wherein the switching circuit is a MOS transistor.
4. The network cable-based multi-signal transmission circuit as claimed in claim 3, further comprising a power supply, wherein the power supply is connected to the source of the MOS transistor, the signal output terminal of the control circuit is connected to the gate of the MOS transistor, and the power input terminal of the detection circuit is connected to the drain of the MOS transistor.
5. The network cable-based multi-signal transmission circuit according to claim 1, further comprising a hybrid video processing circuit, connected to the first balun circuit, for receiving, converting, storing or outputting audio and video signals, and transmitting a coaxial signal.
6. The network cable based multi-signal transmission circuit according to claim 1, wherein the network cable interface is an RJ45 interface.
7. The network cable-based multi-signal transmission circuit as claimed in any one of claims 1 to 6, further comprising a video capture terminal, wherein a power port of the video capture terminal is connected to the level conversion circuit, and a signal input/output port is connected to the second balun circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921634425.2U CN210578884U (en) | 2019-09-27 | 2019-09-27 | Multi-signal transmission circuit based on network cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921634425.2U CN210578884U (en) | 2019-09-27 | 2019-09-27 | Multi-signal transmission circuit based on network cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210578884U true CN210578884U (en) | 2020-05-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921634425.2U Active CN210578884U (en) | 2019-09-27 | 2019-09-27 | Multi-signal transmission circuit based on network cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210578884U (en) |
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2019
- 2019-09-27 CN CN201921634425.2U patent/CN210578884U/en active Active
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