CN106161876A - A kind of circuit suppressing Earth noise to disturb - Google Patents
A kind of circuit suppressing Earth noise to disturb Download PDFInfo
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- CN106161876A CN106161876A CN201610624974.6A CN201610624974A CN106161876A CN 106161876 A CN106161876 A CN 106161876A CN 201610624974 A CN201610624974 A CN 201610624974A CN 106161876 A CN106161876 A CN 106161876A
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- circuit
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- earth
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Picture Signal Circuits (AREA)
Abstract
The invention provides a kind of circuit suppressing Earth noise to disturb, including signal isolation and amplifier module, signal amplification module, load blocks, also include ground wire isolation module；First earth terminal of described signal isolation and amplifier module, the second earth terminal of described signal amplification module, the 3rd earth terminal of described load blocks are connected as signal ground；Described signal ground and publicly between be provided with the first diode group and the second diode group of reverse parallel connection, for described signal ground with isolate publicly.The present invention realizes video signal and the loop common mode disturbances formed publicly is greatly reduced, and improves video display effect, promotes and drives auxiliary experience.
Description
Technical field
The present invention relates to technical field of video processing, particularly relate to a kind of circuit suppressing Earth noise to disturb.
Background technology
Senior drive assist system (Advanced Driver Assistant System, ADAS) is by being installed on car
On sensor collection car inside and outside environmental data, carry out quiet, the identification of dynamic object, detect and the technical places such as tracking
Reason such that it is able to allow driver discover contingent danger in the fastest time, to arouse attention and to improve the master of safety
Dynamic safe practice.As a example by the panoramic parking assist system of senior drive assist system ADAS, by multi-cam collection vehicle
The image of surrounding, and showing on screen with the form of virtual top view, visual angle can according to wheelpath dynamic mobile, it is provided that
The picture that vehicle's surroundings is 360 degree, promotes driving auxiliaring effect, strengthens auxiliary experience, improves safety coefficient of parking.
The various video circuits of current senior drive assist system ADAS (as panorama park, semiautomatic parking, reversing auxiliary
Deng) throwing in addition to the impact of the intrinsic factor of photographic head, the circuit design of its suppression noise jamming is the most complete, particularly at signal
The Anti-interference Design of reason terminal circuit is poor, makes video signal the best in the display effect of LCD end, shows as video display shake substantially
And easily disturbed by ambient signals, auxiliary experience is driven in impact.
Summary of the invention
The technical problem to be solved is to provide a kind of circuit suppressing Earth noise to disturb, by video signal ground
With isolated by diode publicly, it is achieved ground is floating, the loop common mode disturbances reducing video signal with being formed publicly.
For solving above technical problem, the present invention provides a kind of circuit suppressing Earth noise to disturb, including:
Signal isolation and amplifier module, possesses signal input part, the first earth terminal and signal output part, described signal input part
Incoming video signal, the video signal after the output isolation of described signal output part；
Signal amplification module, possesses amplification input, amplifies outfan and the second earth terminal, and described amplification input connects
The signal output part of described signal isolation and amplifier module, signal amplifies the video signal after outfan output is amplified；
Load blocks, possesses load input terminal and the 3rd earth terminal, and described load input terminal connects described signal and amplifies mould
The amplification outfan of block；Described 3rd earth terminal and the first earth terminal, the second earth terminal are connected as signal ground；
Ground wire isolation module, including be connected in parallel on described signal ground and publicly between two groups of diodes, for described
Signal ground with isolate publicly.
Specifically, the video signal of described signal input part input is the original video signal obtained from video capture device
The video differential signal of output after analog digital conversion and digital-to-analogue conversion.
Specifically, described signal isolation and amplifier module is that video isolates circuit, and described video isolation circuit is provided with difference and puts
Big device；
Specifically, described signal amplification module is video cache circuit；
Specifically, two groups of diode closures of described ground wire isolation module are contrary.
Specifically, the circuit of described suppression Earth noise interference also includes DC-stabilized circuit, described DC voltage-stabilizing electricity
4th earth terminal of source circuit connects signal ground.
Specifically, the video isolation IC model in described video isolation circuit is BH7673G；
Specifically, the video cache IC signal in described video cache circuit is D2267；
Specifically, the diode model in described ground wire isolation module is 1N4148.
First earth terminal, the signal of signal isolation and amplifier module are put by the circuit of the suppression Earth noise interference that the present invention provides
Second earth terminal of big module and the 3rd earth terminal of load blocks connect and form signal ground, and by signal ground with pass through publicly
Two groups of diodes of ground wire isolation module are isolated, it is achieved ground is floating, are greatly reduced video signal and returning of being formed publicly
Road common mode disturbances, improves the capacity of resisting disturbance of video signal noise to ground, improves video display effect, promotes and drives auxiliary body
Test.
Accompanying drawing explanation
Fig. 1 is the structural representation of the circuit of the suppression Earth noise interference that the present invention provides；
Fig. 2 is the physical circuit connection figure of the circuit of the suppression Earth noise interference that the present invention provides.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe wholely.The value size of following components and parts is only preferred embodiment, does not constitute limiting the scope of the invention.
See Fig. 1, Fig. 2, be that structural representation and the circuit of the circuit of the suppression Earth noise interference that the present invention provides connects
Figure.In the present embodiment, the circuit of described suppression Earth noise interference, specifically include that
Signal isolation and amplifier module 100, possesses signal input part the 101, first earth terminal 102 and signal output part 103, institute
State signal input part incoming video signal, the video signal after the output isolation of described signal output part 103；
Signal amplification module 200, possesses amplification input 201, amplifies outfan 202 and the second earth terminal 203, described in put
Big input 201 connects the signal output part 103 of described signal isolation and amplifier module 100, after amplifying outfan 202 output amplification
Video signal；
Load blocks 300, possesses load input terminal 301 and the 3rd earth terminal 302, and described load input terminal 301 connects institute
State the amplification outfan 202 of signal amplification module 200；Described 3rd earth terminal 302 and first earth terminal the 102, second earth terminal
203 are connected as signal ground AGND；
Ground wire isolation module 400, including being connected in reverse parallel in described signal ground AGND and two group of two pole between GND publicly
Pipe, for isolating with GND publicly described signal ground AGND.Two groups of diodes of described ground wire isolation module 400
Closure is contrary, and model, quantity are identical, and in the present embodiment, often group diode is provided with the diode of two series aiding connections,
D1, D3 are one group, and D2, D4 are one group.The concrete model of described diode can be 1N4148.
In the present embodiment, the video signal of described signal input part 101 input is at the beginning of video capture device obtains
Difference video signal CVBS_O+, CVBS_O-that beginning video signal exports after analog digital conversion or digital-to-analogue conversion.
In the present embodiment, signal isolation and amplifier module 100 be video isolation circuit U 1 (BH7673G), described video every
It is provided with difference amplifier from circuit U 1 (BH7673G)；
The video signal input terminal U1_PIN4 (VIN) of described video isolation circuit U 1 (BH7673G) and bias input end
U1_PIN5 (VGND) connects the first electric capacity C1 (1uF) and one end of the second electric capacity C1 (1uF), the first electric capacity C1 and second respectively
The other end of electric capacity C1 connects the positive terminal CVBS_O+ and negative pole end CVBS_O-of described difference video signal respectively；Described first
Earth terminal 102 is the earth terminal U1_PIN2 (GND) of video isolation circuit U 1 (BH7673G)；
In the present embodiment, described signal amplification module 300 is video cache circuit U 2 (D2267).Described video cache
Amplification input U2_PIN1 (VIN1) of circuit U 2 (D2267) exports with the signal of described video isolation circuit U 1 (BH7673G)
Connect between end U1_PIN1 (VOUT) and have the 3rd electric capacity C3 (10uF), the amplification input of video cache circuit U 2 (D2267)
Being connected between U2_PIN1 (VIN1) with signal ground (AGND) and have voltage regulation resistance R3 (1M Ω), the transient current for input signal carries
For releasing path, make signal input voltage stable, improve the job stability of video cache circuit U 2 (D2267)；Video cache
The earth terminal U2_PIN2 (GND) of circuit U 2 (D2267) is the second earth terminal.
In the present embodiment, voltage failure indication end U2_PIN3 (VSAG1) of described video cache circuit U 2 (D2267)
Positive terminal and the 5th electric capacity of the 4th electric capacity C4 (22uF/16V) it is connected respectively with VT U2_PIN4 (VOUT1)
The positive terminal of C5 (100uF/16V), the described negative pole end of the 4th electric capacity C4 and the negative pole end of the 5th electric capacity C5 are all connected with described negative
The load input terminal CVBS_OUT+, the load outputs CVBS_OUT-of described load blocks that carry module are the 3rd earth terminal,
The load input terminal CVBS_OUT+ of described load blocks and the load outputs CVBS_OUT-of described load blocks connects LCD and shows
Show device.
In the present embodiment, the circuit of described suppression Earth noise interference also includes DC-stabilized circuit 500, described directly
4th earth terminal of stream voltage-stabilized power supply circuit 500 connects signal ground AGND.
The circuit of the suppression Earth noise interference that the present invention provides, the process obtained from photographic head or other video acquisition modules
Video differential signal after digital-to-analogue conversion/analog-to-digital conversion process is through signal isolation and amplifier module 100 from signal input part 101 even
Connect the amplification input 201 of entering signal amplification module 200, from amplifying outfan 202 after signal amplification module 200 amplifies
It is connected to the load input terminal 301 of load blocks 300, as the anode of signal circuit；The first of signal isolation and amplifier module 100
Earth terminal 102, the second earth terminal 203 of signal amplification module 200 are connected to one with the 3rd earth terminal 302 of load blocks 300
Rise and form signal ground AGND, as the negative terminal of signal circuit.
Two groups of diodes in parallels of described ground wire isolation module 400 are at signal ground AGND and publicly between GND, by signal
Ground isolates with GND publicly.First group of diode D2, D4 use forward to connect and connect the 3rd of described load blocks 300 the
Ground end CVBS_OUT-and GND publicly isolation, prevent publicly on GND various clutters harass the 3rd of described load blocks
On earth terminal CVBS_OUT-, video signal is implemented interference.If there being noise to pass through second group of Opposite direction connection publicly on GND
Diode D1, D3 channel to the video signal input terminal U2_ of the video cache circuit U 2 (D2267) of described signal amplification module 300
PIN1 (VIN1), owing to forming loop, now signal between described video signal input terminal U2_PIN1 (VIN1) and signal ground AGND
Interference signal on ground AGND is identical with the interference signal on described video signal input terminal U2_PIN1 (VIN1), i.e. through regarding
Frequently the amplitude of the video signal positive and negative terminal of buffer circuit U2 (D2267) is to maintain constant, and the noise altered on GND publicly is done
Disturb only by this video signal entirety upwards, float downwards.So, signal ground AGND and two ground of GND publicly it
Between can bear the disturbance fluctuation scope of nearly twice N, make circuit have sufficiently strong capacity of resisting disturbance.The most every
Group number of diodes n of series aiding connection, conduction voltage drop Vf with can the relation of anti-interference amplitude Vr be represented by: n ＞ [Vr/Vf]
([] expression rounds).
In the present embodiment, the first diode group D2 of ground wire isolation module 400, D4 and the second diode group D1, D3 incite somebody to action
Signal ground AGND and GND publicly isolation so that nearly 1.4V can be born between two ground and (take N Vf=
Dynamic range 0.7V).
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (8)
1. suppress the circuit that Earth noise disturbs, including signal isolation and amplifier module, signal amplification module, load blocks, its
It is characterised by: also include ground wire isolation module；
First earth terminal of described signal isolation and amplifier module, the second earth terminal of described signal amplification module, described load mould
3rd earth terminal of block is connected as signal ground；
Described signal ground and publicly between be provided with the first diode group and the second diode group of reverse parallel connection, for institute
State signal ground and isolate publicly.
2. the circuit of suppression Earth noise interference as claimed in claim 1, it is characterised in that: described first diode group and second
Number of diodes in diode group is identical, model is identical, and when described number of diodes is more than 1, described diode is gone here and there in the same direction
Connection.
3. the circuit of suppression Earth noise interference as claimed in claim 1, it is characterised in that: described signal isolation and amplifier module is
Video isolation circuit.
4. the circuit of suppression Earth noise interference as claimed in claim 1, it is characterised in that:
Described signal amplification module is video cache circuit.
5. the circuit of suppression Earth noise interference as claimed in claim 1, it is characterised in that: also include D.C. regulated power supply electricity
Road, the 4th earth terminal of described DC-stabilized circuit connects signal ground.
6. the circuit of suppression Earth noise interference as claimed in claim 2, it is characterised in that:
The model of described diode is 1N4148.
7. the circuit of suppression Earth noise interference as claimed in claim 3, it is characterised in that:
The video isolation IC model of described video isolation circuit is BH7673G.
8. the circuit of suppression Earth noise interference as claimed in claim 4, it is characterised in that:
Video cache IC model in described video cache circuit is D2267.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610624974.6A CN106161876B (en) | 2016-07-29 | 2016-07-29 | A kind of circuit inhibiting Earth noise interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610624974.6A CN106161876B (en) | 2016-07-29 | 2016-07-29 | A kind of circuit inhibiting Earth noise interference |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106161876A true CN106161876A (en) | 2016-11-23 |
| CN106161876B CN106161876B (en) | 2019-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610624974.6A Active CN106161876B (en) | 2016-07-29 | 2016-07-29 | A kind of circuit inhibiting Earth noise interference |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106657715A (en) * | 2016-11-30 | 2017-05-10 | 延锋伟世通电子科技（上海）有限公司 | Vehicle-mounted analog video signal anti-interference system |
| CN109743474A (en) * | 2019-03-18 | 2019-05-10 | 延锋伟世通电子科技（上海）有限公司 | A kind of single-ended camera signals processing circuit of highly resistance immunity |
| CN109802748A (en) * | 2019-03-18 | 2019-05-24 | 延锋伟世通电子科技（上海）有限公司 | A kind of highly resistance immunity difference camera signals processing circuit |
| CN117175930A (en) * | 2023-11-03 | 2023-12-05 | 杭州海康威视数字技术股份有限公司 | Interference suppression module for monitoring system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120113049A1 (en) * | 2010-10-20 | 2012-05-10 | Paulsen Keith L | Sample and hold analog front end for a capacitive touchpad |
| CN103227636A (en) * | 2013-03-27 | 2013-07-31 | 武汉新慧电气科技有限公司 | High-isolation direct splicing half-duplex communication interface module for interconnection of multiple controllers |
| CN203193608U (en) * | 2013-03-27 | 2013-09-11 | 武汉新慧电气科技有限公司 | High isolation direct splice half-duplex communication interface module for interconnection of multiple controllers |
| CN103336457A (en) * | 2013-07-20 | 2013-10-02 | 青岛歌尔声学科技有限公司 | Circuit control system for eliminating ground noise of electronic equipment |
| CN104357851A (en) * | 2014-10-30 | 2015-02-18 | 华为技术有限公司 | Method for inhibiting galvanic corrosion, grounding wire device and grounding system |
-
2016
- 2016-07-29 CN CN201610624974.6A patent/CN106161876B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120113049A1 (en) * | 2010-10-20 | 2012-05-10 | Paulsen Keith L | Sample and hold analog front end for a capacitive touchpad |
| CN103227636A (en) * | 2013-03-27 | 2013-07-31 | 武汉新慧电气科技有限公司 | High-isolation direct splicing half-duplex communication interface module for interconnection of multiple controllers |
| CN203193608U (en) * | 2013-03-27 | 2013-09-11 | 武汉新慧电气科技有限公司 | High isolation direct splice half-duplex communication interface module for interconnection of multiple controllers |
| CN103336457A (en) * | 2013-07-20 | 2013-10-02 | 青岛歌尔声学科技有限公司 | Circuit control system for eliminating ground noise of electronic equipment |
| CN104357851A (en) * | 2014-10-30 | 2015-02-18 | 华为技术有限公司 | Method for inhibiting galvanic corrosion, grounding wire device and grounding system |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106657715A (en) * | 2016-11-30 | 2017-05-10 | 延锋伟世通电子科技（上海）有限公司 | Vehicle-mounted analog video signal anti-interference system |
| CN106657715B (en) * | 2016-11-30 | 2023-03-31 | 延锋伟世通电子科技（上海）有限公司 | Vehicle-mounted analog video signal anti-interference system |
| CN109743474A (en) * | 2019-03-18 | 2019-05-10 | 延锋伟世通电子科技（上海）有限公司 | A kind of single-ended camera signals processing circuit of highly resistance immunity |
| CN109802748A (en) * | 2019-03-18 | 2019-05-24 | 延锋伟世通电子科技（上海）有限公司 | A kind of highly resistance immunity difference camera signals processing circuit |
| CN109743474B (en) * | 2019-03-18 | 2023-04-25 | 延锋伟世通电子科技（上海）有限公司 | High-noise-immunity single-ended camera signal processing circuit |
| CN109802748B (en) * | 2019-03-18 | 2023-08-25 | 延锋伟世通电子科技（上海）有限公司 | High-immunity differential camera signal processing circuit |
| CN117175930A (en) * | 2023-11-03 | 2023-12-05 | 杭州海康威视数字技术股份有限公司 | Interference suppression module for monitoring system |
| CN117175930B (en) * | 2023-11-03 | 2024-01-26 | 杭州海康威视数字技术股份有限公司 | Interference suppression module for monitoring system |
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| CN106161876B (en) | 2019-06-11 |
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