CN209896693U - High definition video signal lightning protection circuit - Google Patents
High definition video signal lightning protection circuit Download PDFInfo
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- CN209896693U CN209896693U CN201920757337.5U CN201920757337U CN209896693U CN 209896693 U CN209896693 U CN 209896693U CN 201920757337 U CN201920757337 U CN 201920757337U CN 209896693 U CN209896693 U CN 209896693U
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Abstract
The utility model discloses a high definition video signal lightning protection circuit, which comprises a gas discharge tube, an electronic transformer, a rectifier bridge and a circuit protection device, wherein the gas discharge tube is connected in parallel with the signal input end of the equipment; the electronic transformer is respectively connected with the signal input end of the equipment and the equipment in series; the rectifier bridge is connected with the electronic transformer in parallel, and the circuit protection device is connected with the rectifier bridge in series. The utility model isolates the signal input end and the signal output end of the equipment through the electronic transformer, and the lightning current is discharged by combining the gas discharge tube and the circuit protection device, thereby reducing the attenuation and interference of the circuit to the equipment signal on one hand; meanwhile, the lightning current is blocked by adopting physical isolation, so that the lightning current is not conducted to the equipment, and the equipment can be better protected.
Description
Technical Field
The utility model relates to a lightning protection technical field, concretely relates to high definition video signal lightning protection circuit.
Background
The traditional high definition video Signal (SDI) lightning protection circuit has the biggest defect that decoupling resistors are connected in series in a circuit, and the junction capacitance and impedance of the decoupling resistors can attenuate and interfere signals to cause the faults of unclear video image or blocked signals and the like; meanwhile, the lightning current also has more residual current residual voltage which is conducted to the rear-end video signal equipment, so that the video equipment is damaged.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can reduce the circuit to video signal's decay and interference and have lightning protection function's high definition video signal lightning protection circuit.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a high-definition video signal lightning protection circuit comprises a gas discharge tube, an electronic transformer, a rectifier bridge and a circuit protection device, wherein the gas discharge tube is connected with a signal input end of equipment in parallel; the electronic transformer is respectively connected with the signal input end of the equipment and the equipment in series; the rectifier bridge is connected with the electronic transformer in parallel, and the circuit protection device is connected with the rectifier bridge in series.
It should be further added that, since the signal output terminal of the device is connected in series with the device, and the electronic transformer is connected in series with the signal input terminal of the device and the device, respectively, it is equivalent to that the electronic transformer is disposed between the signal input terminal of the device and the signal output terminal of the device, that is, the signal input terminal of the device and the signal output terminal of the device are physically isolated, and as is known, the electronic transformer is provided with a coil, and the coil of the electronic transformer adopts 1: 1 and is wound into an inductance matched with the signal impedance according to the frequency of the equipment so as to achieve the minimum attenuation to the signal; the gas discharge tube is arranged between the electronic transformer and the signal input end of the equipment and has the following functions: most of the lightning current is discharged by the gas discharge tube before the signal input of the device conducts the signal to the electronic transformer. The residual lightning voltage is further reduced by the circuit protection device before the signal is transmitted to the signal output end of the equipment from the electronic transformer, and the junction capacitance of the general circuit protection device is large, so that the junction capacitance of a branch circuit where the circuit protection device is located needs to be reduced by connecting the circuit protection device in series, and the influence of the junction capacitance of the circuit protection device on video signals in the circuit is reduced. The device can protect the signal transmission of the device and can minimize the interference to the device signal. And the residual voltage and residual current of the lightning wave are lower.
Further, the circuit protection device includes a TVS diode.
Furthermore, a primary winding and a secondary winding are arranged on the electronic transformer, the primary winding is connected with a signal input end of the equipment in series, and the secondary winding is connected with the equipment in series; the rectifier bridge is connected in parallel with the secondary winding.
Further, the device comprises a video device.
The working principle of the invention is as follows:
the gas discharge tube is connected in parallel with the signal input end of the video equipment, the primary winding of the electronic transformer is connected in series with the input end of the video equipment, and the secondary winding of the electronic transformer is connected in series with the video equipment; the rectifier bridge is connected in parallel with a secondary winding of the electronic transformer; the TVS diode is connected in series with the rectifier bridge; when the thunder surge takes place, the thunder surge firstly passes through gas discharge tube, utilizes gas discharge tube's nonlinear characteristic to discharge most thunder surge, and electronic transformer's effect is from elementary coupling to the secondary with the signal, and electronic transformer's preparation is 1: 1 are wound according to the frequency characteristics of the video equipment signal, so that the electronic transformer has very little attenuation to the video equipment signal.
Meanwhile, when the residual lightning surge after the discharge of the gas discharge tube reaches the primary winding of the electronic transformer, the lightning surge is coupled with high impedance by the primary winding, so that the lightning surge reaching the secondary winding is weaker, and the residual lightning surge is further inhibited by the TVS diode, so that the video equipment cannot be damaged, the video equipment is protected, and the lightning protection effect is achieved. Because the junction capacitance of TVS diode is great, because rectifier bridge and TVS diode are established ties, the rectifier bridge can reduce the junction capacitance of the branch road that TVS diode is located to reduce because of the influence of the junction capacitance of TVS diode to video equipment's signal.
The utility model has the advantages of:
the signal input end and the signal output end of the equipment are isolated through the electronic transformer, and then the lightning current is discharged by combining the gas discharge tube and the circuit protection device, so that the attenuation and the interference of the circuit to the equipment signal are reduced; meanwhile, the lightning current is blocked by adopting physical isolation, so that the lightning current is not conducted to the equipment, and the equipment can be better protected.
Drawings
Fig. 1 is a schematic diagram of a circuit composition.
Reference numerals:
a video device 1; a rectifier bridge 2; a TVS diode 3; a gas discharge tube 4; an electronic transformer 5.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the following embodiments are based on the technical solution, and the detailed embodiments and the specific operation processes are provided, but the protection scope of the present invention is not limited to the embodiments.
A high definition video signal lightning protection circuit, as shown in figure 1, comprises a gas discharge tube 4, an electronic transformer 5, a rectifier bridge 2 and a circuit protection device, wherein the gas discharge tube 4 is connected with a signal input end of equipment in parallel; the electronic transformer 5 is respectively connected with the signal input end of the equipment and the equipment in series; the rectifier bridge is connected with the electronic transformer 5 in parallel, and the circuit protection device is connected with the rectifier bridge 2 in series.
It should be further added that, since the signal output terminal of the device is connected in series with the device, and the electronic transformer 5 is connected in series with the signal input terminal of the device and the device, respectively, it is equivalent to that the electronic transformer 5 is disposed between the signal input terminal of the device and the signal output terminal of the device, i.e. the signal input terminal of the device and the signal output terminal of the device are physically isolated, and as is known, the electronic transformer 5 is provided with a coil, and the coil of the electronic transformer 5 adopts 1: 1 and is wound into an inductance matched with the signal impedance according to the frequency of the equipment so as to achieve the minimum attenuation to the signal; the gas discharge tube 4 is arranged between the electronic transformer 5 and the signal input of the device for the purpose of: most of the lightning current is discharged by the gas discharge tube 4 before the signal input of the device conducts the signal to the electronic transformer 5. The residual lightning voltage is further reduced by the circuit protection device before the signal is transmitted from the electronic transformer 5 to the signal output end of the equipment, and the junction capacitance of the general circuit protection device is large, so that the junction capacitance of the branch where the circuit protection device is located needs to be reduced by connecting the circuit protection device in series, and the influence of the junction capacitance of the circuit protection device on the video signal in the circuit is reduced. The device can protect the signal transmission of the device and can minimize the interference to the device signal. And the residual voltage and residual current of the lightning wave are lower.
Further, the circuit protection device includes a TVS diode 3.
Furthermore, a primary winding and a secondary winding are arranged on the electronic transformer 5, the primary winding is connected with a signal input end of equipment in series, and the secondary winding is connected with the equipment in series; the rectifier bridge 2 is connected in parallel with the secondary winding.
Further, the apparatus comprises a video apparatus 1.
The working principle of the invention is as follows:
the gas discharge tube 4 is connected in parallel with the signal input end of the video equipment 1, the primary winding of the electronic transformer 5 is connected in series with the input end of the video equipment 1, and the secondary winding of the electronic transformer 5 is connected in series with the video equipment 1; the rectifier bridge 2 is connected in parallel with a secondary winding of the electronic transformer 5; the TVS diode 3 is connected in series with the rectifier bridge 2; when thunder surge takes place, thunder surge first passes through gas discharge tube 4, utilizes gas discharge tube 4's nonlinear characteristic to discharge most thunder surge, and electronic transformer 5's effect is from elementary coupling to the secondary with the signal, and electronic transformer 5's preparation is 1: 1 is wound according to the frequency characteristic of a high-definition video Signal (SDI)1.485GHZ, so that the attenuation of the electronic transformer 5 to the signal of the video equipment 1 is very small.
Meanwhile, when the residual lightning surge after being discharged through the gas discharge tube 4 reaches the primary winding of the electronic transformer 5, the lightning surge is coupled with high impedance by the primary winding, so that the lightning surge reaching the secondary winding is weaker, and the residual lightning surge is further inhibited through the TVS diode 3, so that the video equipment 1 cannot be damaged, the video equipment 1 is protected, and the lightning protection effect is achieved. Because the junction capacitance of TVS diode 3 is great, because rectifier bridge 2 and TVS diode 3 are established ties, rectifier bridge 2 can reduce the junction capacitance of the branch road that TVS diode 3 is located to reduce because of the influence of TVS diode 3's junction capacitance to video equipment 1's signal.
Various corresponding changes and modifications can be made by those skilled in the art according to the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.
Claims (4)
1. A high-definition video signal lightning protection circuit is characterized by comprising a gas discharge tube, an electronic transformer, a rectifier bridge and a circuit protection device, wherein the gas discharge tube is connected with a signal input end of equipment in parallel; the electronic transformer is respectively connected with the signal input end of the equipment and the equipment in series; the rectifier bridge is connected with the electronic transformer in parallel, and the circuit protection device is connected with the rectifier bridge in series.
2. The high definition video signal lightning protection circuit of claim 1, wherein the circuit protection device comprises a TVS diode.
3. The high definition video signal lightning protection circuit according to claim 1, wherein the electronic transformer is provided with a primary winding and a secondary winding, the primary winding is connected in series with a signal input end of the device, and the secondary winding is connected in series with the device; the rectifier bridge is connected in parallel with the secondary winding.
4. The high definition video signal lightning protection circuit of claim 1, wherein the device comprises a video device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920757337.5U CN209896693U (en) | 2019-05-23 | 2019-05-23 | High definition video signal lightning protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920757337.5U CN209896693U (en) | 2019-05-23 | 2019-05-23 | High definition video signal lightning protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209896693U true CN209896693U (en) | 2020-01-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920757337.5U Active CN209896693U (en) | 2019-05-23 | 2019-05-23 | High definition video signal lightning protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209896693U (en) |
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2019
- 2019-05-23 CN CN201920757337.5U patent/CN209896693U/en active Active
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 512300 No.1 industrial transfer park, Lelang Road, Lechang City, Shaoguan City, Guangdong Province Patentee after: Guangdong Gould Group Co.,Ltd. Address before: 512300 No.1 industrial transfer park, Lelang Road, Lechang City, Shaoguan City, Guangdong Province Patentee before: SHAOGUAN GAOERDE LIGHTNING PROTECTION TECHNOLOGY CO.,LTD. |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A Lightning Protection Circuit for HD Video Signal Effective date of registration: 20221109 Granted publication date: 20200103 Pledgee: Lechang Sub branch of Agricultural Bank of China Ltd. Pledgor: Guangdong Gould Group Co.,Ltd. Registration number: Y2022980021102 |