CN221202149U - Video signal electromagnetic protection circuit - Google Patents
Video signal electromagnetic protection circuit Download PDFInfo
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- CN221202149U CN221202149U CN202421032186.4U CN202421032186U CN221202149U CN 221202149 U CN221202149 U CN 221202149U CN 202421032186 U CN202421032186 U CN 202421032186U CN 221202149 U CN221202149 U CN 221202149U
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- 239000003990 capacitor Substances 0.000 claims abstract description 32
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 230000001629 suppression Effects 0.000 claims description 10
- 230000001052 transient effect Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to an electromagnetic protection circuit for video signals. The filter comprises a plurality of passages, wherein each passage comprises a bleeder unit, a filter unit, a decoupling unit and a clamping unit; the bleeder unit comprises a diode D1 and a coupler C01, wherein the cathode of the diode D1 is coupled with the input end through the coupler C01, and the anode of the diode D1 is grounded; the filtering unit comprises capacitors C1 and C2, and the capacitors C1 and C2 are connected in parallel and then connected in series between the input end and the grounding end; the decoupling unit comprises resistors R1 and R2, and the resistors R1 and R2 are sequentially connected in series between an input end and an output end; the clamping unit comprises diodes VR1 and VR2, wherein the diode VR1 is connected between the common end of the resistor R1 and the resistor R2 and the grounding end, and the diode VR2 is connected between the resistor R2 and the common end of the output end. The problem that the video signal protection circuit in the prior art cannot completely release and absorb the strong electromagnetic pulse is solved, and the effect of completely releasing and absorbing the strong electromagnetic pulse is achieved.
Description
Technical Field
The utility model relates to the technical field of an abnormality protection circuit, in particular to an electromagnetic protection circuit for video signals.
Background
The video signal is usually an analog signal, has the characteristics of low amplitude, fast rising edge and short pulse width, is very easy to be interfered by electromagnetic pulse during long-distance transmission, and is easy to cause the conditions of incomplete signal transmission and even burnt out circuit.
The prior video signal protection circuit usually uses a multi-stage lightning protection circuit for protection, but the inventor discovers that the above technology has at least the following technical problems in the process of realizing the technical scheme in the embodiment of the utility model:
The strong electromagnetic pulse in the electromagnetic pulse has the characteristics of strong persistence and high power. The existing lightning protection circuit lacks protection function to strong electromagnetic pulse, can not guarantee complete release and absorption to strong electromagnetic pulse, and is easy to destroy circuit components and even burn products.
Disclosure of utility model
The embodiment of the application solves the technical problem that the video signal protection circuit cannot completely release and absorb the strong electromagnetic pulse in the prior art by providing the video signal electromagnetic protection circuit, and achieves the technical effects of completely releasing and absorbing the strong electromagnetic pulse.
The embodiment of the application provides an electromagnetic protection circuit for video signals, which comprises a plurality of channels, wherein each channel comprises a discharge unit, a filtering unit, a decoupling unit and a clamping unit;
The bleeder unit comprises a diode D1 and a coupler C01, wherein the cathode of the diode D1 is coupled with the input end through the coupler C01, and the anode of the diode D1 is grounded;
The filtering unit comprises a capacitor C1 and a capacitor C2, wherein the capacitor C1 is connected with the capacitor C2 in parallel and then connected in series between the input end and the grounding end;
The decoupling unit comprises a resistor R1 and a resistor R2, and the resistor R1 and the resistor R2 are sequentially connected in series between the input end and the output end;
The clamping unit comprises a diode VR1 and a diode VR2, wherein the diode VR1 is connected between the common terminal of the resistor R1 and the resistor R2 and the ground terminal, and the diode VR2 is connected between the resistor R2 and the common terminal of the output terminal.
Preferably, the differential mode protection unit further comprises a transient suppression diode VR5, and two ends of the transient suppression diode VR5 are respectively connected to the common ends of the paths and the output end.
Preferably, the input terminal includes a first input terminal VinP and a second input terminal VinN, the output terminal includes a first output terminal VoutP and a second output terminal VoutN, the number of the channels is two, and the two channels are respectively connected in series between the first input terminal VinP and the first output terminal VoutP and between the second input terminal VinN and the second output terminal VoutN.
Preferably, the coupler C01 is a capacitor.
Preferably, the capacitor C1 and the capacitor C2 are both microwave capacitors.
Preferably, the diode VR1 and the diode VR2 are transient suppression diodes.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
According to the embodiment of the application, the diode, the decoupling unit and the clamping unit are arranged, so that strong electromagnetic pulse is effectively restrained, the situation that damage occurs due to overheating when continuous wave pulse and long-time modulation pulse injection are carried out is avoided, normal transmission of video signals is protected, the residual voltage is controlled within 5V, the residual current is controlled within 2A through the arrangement of the bleeder unit, the filter unit, the decoupling unit and the clamping unit, the transmission quality of the video signals is further ensured, and damage to circuits or equipment is avoided.
Drawings
Fig. 1 shows a circuit block diagram of a video signal electromagnetic protection circuit according to an embodiment of the present application;
Fig. 2 shows a schematic circuit diagram of an electromagnetic protection circuit for video signals according to an embodiment of the present application.
Detailed Description
The embodiment of the application solves the technical problem that the video signal protection circuit cannot completely release and absorb the strong electromagnetic pulse in the prior art by providing the video signal electromagnetic protection circuit, and achieves the technical effects of completely releasing and absorbing the strong electromagnetic pulse.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.
In the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Referring to fig. 1 to 2, the present utility model provides an electromagnetic protection circuit for video signals, which includes a plurality of paths including a bleeder unit 100, a filtering unit 200, a decoupling unit 300 and a clamping unit 400; the bleeder unit 100 comprises a diode D1 and a coupler C01, wherein the cathode of the diode D1 is coupled with the input end through the coupler C01, and the anode of the diode D1 is grounded; the filtering unit 200 comprises a capacitor C1 and a capacitor C2, wherein the capacitor C1 and the capacitor C2 are connected in parallel and then connected in series between the input end and the grounding end; the decoupling unit 300 comprises a resistor R1 and a resistor R2, wherein the resistor R1 and the resistor R2 are sequentially connected in series between an input end and an output end; the clamping unit 400 includes a diode VR1 and a diode VR2, the diode VR1 is connected between a common terminal of the resistor R1 and the resistor R2 and the ground terminal, and the diode VR2 is connected between the common terminal of the resistor R2 and the output terminal.
In this embodiment, the strong electromagnetic pulse mainly refers to a lightning electromagnetic pulse, a nuclear electromagnetic pulse and a high-power microwave pulse, and the discharge unit 100 discharges and reflects the strong electromagnetic pulse, when the strong electromagnetic pulse enters the input end, the strong electromagnetic pulse is coupled to two ends of the diode D1 through the coupler C01, and discharges and reflects the strong electromagnetic pulse, so that the level of the microwave pulse at the output end is reduced, and since the normal signal cannot pass through the coupler C01, the normal transmission of the signal can be ensured.
In the filtering unit 200, the capacitor C1 is used for low-frequency pulses, the capacitor C2 is used for high-frequency pulses, and a filtering network formed by connecting the capacitor C1 and the capacitor C2 in parallel is used for filtering energy in the frequency domain of electronic pulses and other pulses, so that conduction interference is reduced.
Decoupling unit 300 is configured to redistribute the pulse energy at the input and the pulse energy at the output such that the discharge unit 100 performs power limiting on the strong electromagnetic pulse after processing a substantial portion of the pulse energy, and discharges a substantial portion of the pulse energy. The resistors R1 and R2 are used for further limiting and distributing the residual pulse energy, so that the pulse energy flowing into the clamping unit 400 is further reduced, and the clamping level of the clamping unit 400 is further reduced.
In the clamping unit 400, the diodes VR1 and VR2 are used to clamp the level and voltage of the remaining pulses, so that the output terminal residual voltage and clipping level are within a safe range.
The embodiment of the application effectively suppresses strong electromagnetic pulse by arranging the diode, the decoupling unit 300 and the clamping unit 400, avoids the damage caused by overheating when continuous wave pulse and long-time modulation pulse injection are carried out, protects the normal transmission of video signals, and controls the residual voltage within 5V and the residual current within 2A by arranging the bleeder unit 100, the filter unit 200, the decoupling unit 300 and the clamping unit 400, thereby further ensuring the transmission quality of the video signals and avoiding the damage of circuits or equipment.
Referring to fig. 1 to 2, the differential mode protection unit 500 further includes a transient suppression diode VR5, where two ends of the transient suppression diode VR5 are respectively connected to a common end of the multiple paths and the output end.
In this embodiment, the differential mode protection unit 500 is configured to process differential mode energy at the output end, so as to ensure balance of levels between the paths.
Referring to fig. 1 to 2, the input end includes a first input end VinP and a second input end VinN, the output end includes a first output end VoutP and a second output end VoutN, the number of channels is two, and the two channels are respectively connected in series between the first input end VinP and the first output end VoutP and between the second input end VinN and the second output end VoutN.
In this embodiment, the multiple paths are respectively connected in series between different input ends and output ends, so as to ensure stability of video signal transmission.
In some embodiments, coupler C01 is a capacitor. Wherein the use of a capacitor can act as a coupling.
In some embodiments, the capacitor C1 and the capacitor C2 are both microwave capacitors. The microwave capacitor has a higher inductance value and a lower resistance value, and can better meet the requirements on frequency response and power transmission.
In some embodiments, diode VR1 and diode VR2 are both transient suppression diodes. The transient suppression diode can clamp the level and the voltage of the residual pulse more quickly, and limit the residual voltage and the amplitude limiting level of the output end within a safe range.
It should be noted that the components between the embodiments of the present disclosure may be interchanged as long as the corresponding functions are achieved.
The following points need to be described:
(1) Unless otherwise defined, like reference numerals refer to like meanings in the embodiments of the disclosure and the drawings.
(2) In the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are referred to, and other structures may refer to the general design.
(3) In the drawings for describing embodiments of the present disclosure, components or regions are exaggerated for clarity. It will be understood that when an element is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.
The foregoing is merely specific embodiments of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the disclosure, and it is intended to cover the scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (6)
1. The video signal electromagnetic protection circuit is characterized by comprising a plurality of paths, wherein the paths comprise a bleeder unit, a filtering unit, a decoupling unit and a clamping unit;
The bleeder unit comprises a diode D1 and a coupler C01, wherein the cathode of the diode D1 is coupled with the input end through the coupler C01, and the anode of the diode D1 is grounded;
The filtering unit comprises a capacitor C1 and a capacitor C2, wherein the capacitor C1 is connected with the capacitor C2 in parallel and then connected in series between the input end and the grounding end;
The decoupling unit comprises a resistor R1 and a resistor R2, and the resistor R1 and the resistor R2 are sequentially connected in series between the input end and the output end;
The clamping unit comprises a diode VR1 and a diode VR2, wherein the diode VR1 is connected between the common terminal of the resistor R1 and the resistor R2 and the ground terminal, and the diode VR2 is connected between the resistor R2 and the common terminal of the output terminal.
2. The circuit of claim 1, further comprising a differential mode protection unit comprising a transient suppression diode VR5, the transient suppression diode VR5 being connected across a common terminal of the plurality of paths and the output terminal, respectively.
3. A circuit according to claim 1 or 2, characterized in that the input terminals comprise a first input terminal VinP and a second input terminal VinN, the output terminals comprise a first output terminal VoutP and a second output terminal VoutN, the number of the paths is two, and the two paths are connected in series between the first input terminal VinP and the first output terminal VoutP and between the second input terminal VinN and the second output terminal VoutN, respectively.
4. A circuit according to claim 3, wherein the coupler C01 is a capacitor.
5. The circuit of claim 4, wherein the capacitor C1 and the capacitor C2 are microwave capacitors.
6. The circuit of claim 4 or 5, wherein the diode VR1 and the diode VR2 are transient suppression diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421032186.4U CN221202149U (en) | 2024-05-13 | 2024-05-13 | Video signal electromagnetic protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421032186.4U CN221202149U (en) | 2024-05-13 | 2024-05-13 | Video signal electromagnetic protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221202149U true CN221202149U (en) | 2024-06-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202421032186.4U Active CN221202149U (en) | 2024-05-13 | 2024-05-13 | Video signal electromagnetic protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221202149U (en) |
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2024
- 2024-05-13 CN CN202421032186.4U patent/CN221202149U/en active Active
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