CN109802748A - A kind of highly resistance immunity difference camera signals processing circuit - Google Patents
A kind of highly resistance immunity difference camera signals processing circuit Download PDFInfo
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- CN109802748A CN109802748A CN201910201047.7A CN201910201047A CN109802748A CN 109802748 A CN109802748 A CN 109802748A CN 201910201047 A CN201910201047 A CN 201910201047A CN 109802748 A CN109802748 A CN 109802748A
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Abstract
A kind of highly resistance immunity difference camera signals processing circuit, the one end resistor R1 connects output signal anode, the one end capacitor C2 and one end resistor R3 of camera, the resistor R1 other end connects the one end resistor R2 and the one end capacitor C1, capacitor C1 other end ground connection；Output signal cathode, the capacitor C2 other end and one end resistor R5 of resistor R2 other end connection camera, the resistor R5 other end connects the one end resistor R6 and the one end capacitor C4, the resistor R3 other end connects the one end resistor R4 and the one end capacitor C3, the resistor R4 other end is connected and is grounded with the resistor R6 other end, and the capacitor C3 other end, the capacitor C4 other end are separately connected video decoding chip signal sampling end positive and negative electrode.The present invention can effectively inhibit the common mode interference and vehicle body electromagnetic interference of difference or pseudo-differential camera, and at low cost, parameter regulation is simple and convenient, high reliablity, be suitable for automobile electronics.
Description
Technical field
The present invention relates to electroporation field more particularly to electrical apparatus for vehicle use, especially a kind of highly resistance immunity difference camera shooting
Head signal processing circuit.
Background technique
In the prior art, camera on automobile using more and more, and the harness network on automobile is complicated, electromagnetism ring
Border is severe, and camera signals are highly susceptible to the arrangement of harness and the influence of electromagnetic interference, has picture water ripples occur often
Or jitter phenomenon.Therefore the input signal processing circuit of common-path interference is required, to guarantee that image is shown normally.
Currently, common camera input lattice network have it is following several:
Single-ended camera inputs lattice network.Although program circuit is simple, anti-interference is poor, especially works as ground wire
On when have common mode interference, display picture will appear water ripples.
Pseudo-differential camera inputs lattice network.The program is in schemeOn the basis of improve, solve ground wire
Common mode interference problem, but work as Che Shangyou electromagnetic interference, especially when having BCI(Bulk Current Injection, Vehicular visual
Backing system) when, picture will appear water ripples or tremble screen phenomenon.
Difference camera inputs lattice network.The program and schemeIt compares, display image quality is relatively clear, but same
There are when BCI, picture has water ripples or trembles screen phenomenon sample, and is only applicable to difference camera output type.
Dedicated integrated processing chip.With scheme, schemeAnd schemeIt compares, dedicated integrated processing chip
Filtering and interference free performance have been improved, but its cost is also higher.
Summary of the invention
The technical problem to be solved in the present invention is to provide one kind can be avoided common mode interference present on camera ground wire and
Vehicle body electromagnetic interference, and the signal processing circuit that at low cost, high reliablity, stability are strong.
In order to solve the above-mentioned technical problem, the technical solution of the present invention is to provide a kind of highly resistance immunity difference camera signals
Processing circuit, it is characterised in that: including resistor R1, the one end the resistor R1 connects the output signal anode CVBS of camera
+, the one end capacitor C2 and the one end resistor R3, described resistor R1 other end connection one end resistor R2 and capacitor C1 mono-
End, the capacitor C1 other end ground connection；The output signal cathode CVBS- of the resistor R2 other end connection camera, institute
State the capacitor C2 other end and the one end resistor R5, described resistor R5 other end connection one end resistor R6 and capacitor C4 mono-
End, resistor R3 other end connection one end resistor R4 and the one end capacitor C3, the resistor R4 other end and described
The connection of the resistor R6 other end and ground connection, the capacitor C3 other end connection video decoding chip signal sampling rectify pole AN1,
The capacitor C4 other end connects video decoding chip signal sampling end cathode AN2.
Preferably, the resistor R1, resistor R2 are terminal coupling resistor, the resistor R1, resistor R2
The sum of resistance value of connecting is equal with the output impedance of external camera.
Preferably, the resistor R1, resistor R2 guarantee to take the photograph for eliminating the signal reflex in camera cable
As the output signal of head can be transmitted to rear stage circuit.
Preferably, the resistor R1 guarantees the defeated of camera for eliminating the signal reflex in camera cable
Signal can be transmitted to rear stage circuit out.
Preferably, the capacitor C1 is filter condenser, for filtering out the output signal cathode CVBS- of the camera
Grounding interference signal on end line.
Preferably, the resistor R2 is for keeping difference monitoring voltage equal, to eliminate the output letter of the camera
Common-mode voltage interference on number cathode CVBS- end line.
Preferably, the capacitor C2 is used to absorb the output signal anode CVBS+ and the camera of the camera
Output signal cathode CVBS- difference mode signal interference.
Preferably, the resistor R3 and resistor R4 forms potential-divider network, the resistor R5 and resistor R6 composition
Potential-divider network, can be with to rear-class video decoding chip for dividing the signal of the output signal anode CVBS+ of the camera
In the range of receiving, while transient suppression pulse voltage, electric current is reduced, rear-class video decoding chip is protected.
Preferably, the resistor R3, resistor R4, resistor R5, the resistor that resistor R6 is same error.
Preferably, the capacitor C3, capacitor C4 are AC decoupling capacitors, for eliminating the direct current of incoming video signal
Bias voltage.
Preferably, as the output signal anode CVBS+ of the camera or output signal cathode CVBS- of the camera
When being shorted to cell voltage, " resistor R3, resistor R4 and capacitor C3 " or " resistor R5, resistor R6 and resistor C4 "
It can reduce the voltage and current for being input to next stage video decoding chip, effective protection video decoding chip.
Compared with prior art, highly resistance immunity difference camera signals processing circuit provided by the invention has following beneficial to effect
Fruit:
1, common mode interference existing for camera negative terminal can effectively be inhibited；
2, BCI differential mode vehicle body electromagnetic interference can effectively be inhibited；
3, it is not only applicable to difference camera, is also applied for pseudo-differential camera；
4, it is designed using discrete component, at low cost, flexible design, parameter regulation is simple and convenient；
5, the component of automobile is selected, high reliablity, stability is strong, is suitable for automobile electronics.
Detailed description of the invention
Fig. 1 is highly resistance immunity difference camera signals processing circuit schematic diagram provided in this embodiment；
Fig. 2 is highly resistance immunity difference camera signals processing circuit exemplary application map provided in this embodiment.
Specific embodiment
Fig. 1 is highly resistance immunity difference camera signals processing circuit schematic diagram provided in this embodiment, the high interference immunity
Property difference camera signals processing circuit include resistor R1 ~ R6, capacitor C1 ~ C4, the one end resistor R1 connects camera
Output signal anode CVBS+, the one end capacitor C2 and the one end resistor R3, the resistor R1 other end connect the one end resistor R2 and
The one end capacitor C1, capacitor C1 other end ground connection；The output signal cathode CVBS- of resistor R2 other end connection camera,
The capacitor C2 other end and the one end resistor R5, the resistor R5 other end connect the one end resistor R6 and the one end capacitor C4, electricity
Resistance device R3 other end connection one end resistor R4 and the one end capacitor C3, the resistor R4 other end are connected with the resistor R6 other end
And be grounded, the capacitor C3 other end connects video decoding chip signal sampling and rectifies pole AN1, and the capacitor C4 other end connects video
Decoding chip signal sampling end cathode AN2.
Wherein, resistor R1, resistor R2 be terminal coupling resistor, resistor R1, resistor R2 series connection resistance value it
It is equal with the output impedance of external camera.Since the output impedance of difference camera is frequently with 75 Ω, therefore in the present embodiment,
Resistor R1, resistor R2 resistance value are 37.5 Ω.The effect of resistor R1, resistor R2 are to eliminate in camera cable
Signal reflex in line guarantees that the output signal of camera can be transmitted to rear stage circuit, reduces signal reflex loss, is promoted
Efficiency of transmission.
Capacitor C1 is filter condenser, and the ground wire mainly filtered out on the output signal cathode CVBS- end line of camera is dry
Disturb signal.
Resistor R1, resistor R2 keep difference monitoring voltage equal simultaneously, effectively eliminate the output signal cathode of camera
The common-mode voltage at the end CVBS- interferes.
Capacitor C2 can effectively absorb the output signal anode CVBS+ of camera and the output signal cathode of camera
The difference mode signal of CVBS- interferes, and offsets except frequency is particularly evident greater than the interference signal of 1MHZ, can be effectively improved EMC BCI
Interference.
Resistor R3 and resistor R4 forms potential-divider network, can be by the signal at the end output signal anode CVBS+ of camera
In the range of partial pressure can be born to rear-class video decoding chip.Simultaneously electric current, protection can be reduced with transient suppression pulse voltage
Rear-class video decoding chip.
Resistor R5 and resistor R6 also forms potential-divider network, acts on similar with resistor R3 and resistor R4.For up to
To better display performance, image fault is avoided, resistor R3, resistor R4, resistor R5, resistor R6 will select same mistake
The resistor of difference, and error rate is low as far as possible.
Capacitor C3, capacitor C4 are AC decoupling capacitors, can eliminate the DC offset voltage of incoming video signal.When
When the output signal anode CVBS+ of camera or the output signal cathode CVBS- of camera are shorted to cell voltage, " resistor
R3, resistor R4 and capacitor C3 " or " resistor R5, resistor R6 and resistor C4 " can reduce and be input to next stage video
The voltage and current of decoding chip, effective protection video decoding chip.
It is illustrated in figure 2 highly resistance immunity difference camera signals processing circuit exemplary application map provided in this embodiment, is taken the photograph
As output signal anode CVBS+, the cathode CVBS- of head are coupled with the positive and negative output end of difference camera Camera.Video solution
Code chip signal sampling end positive and negative electrode AN1, AN2 are respectively outputted to the positive and negative input of video decoding chip Video decoder
End.R7, R8 are the output impedance of difference camera.
Experiments have shown that highly resistance immunity difference camera signals processing circuit provided in this embodiment can effectively inhibit to image
Common mode interference and BCI differential mode vehicle body electromagnetic interference existing for head negative terminal, parameter regulation is simple and convenient, high reliablity, and stability is strong.
The above, only presently preferred embodiments of the present invention, not to the present invention in any form with substantial limitation,
It should be pointed out that under the premise of not departing from the method for the present invention, can also be made for those skilled in the art
Several improvement and supplement, these are improved and supplement also should be regarded as protection scope of the present invention.All those skilled in the art,
Without departing from the spirit and scope of the present invention, when made using disclosed above technology contents it is a little more
Dynamic, modification and the equivalent variations developed, are equivalent embodiment of the invention；Meanwhile all substantial technologicals pair according to the present invention
The variation, modification and evolution of any equivalent variations made by above-described embodiment, still fall within the range of technical solution of the present invention
It is interior.
Claims (10)
1. a kind of highly resistance immunity difference camera signals processing circuit, it is characterised in that: including resistor R1, the resistor R1
One end connects output signal anode CVBS+, the one end capacitor C2 and one end resistor R3 of camera, and the resistor R1 is another
End connection one end resistor R2 and the one end capacitor C1, the capacitor C1 other end ground connection；The resistor R2 other end connects
The output signal cathode CVBS-, the capacitor C2 other end and the one end resistor R5 of camera are met, the resistor R5 is another
End connection one end resistor R6 and the one end capacitor C4, described resistor R3 other end connection one end resistor R4 and capacitor C3
One end, the resistor R4 other end are connected and are grounded with the resistor R6 other end, the capacitor C3 other end connection
Video decoding chip signal sampling rectifies pole AN1, and capacitor C4 other end connection video decoding chip signal sampling end is negative
Pole AN2.
2. a kind of highly resistance immunity difference camera signals processing circuit as described in claim 1, it is characterised in that: the resistance
Device R1, resistor R2 are terminal coupling resistor, the sum of series connection resistance value and the external camera of the resistor R1, resistor R2
Output impedance it is equal.
3. a kind of highly resistance immunity difference camera signals processing circuit as described in claim 1, it is characterised in that: the resistance
Device R1, resistor R2 guarantee that the output signal of camera can be transmitted for eliminating the signal reflex in camera cable
To rear stage circuit.
4. a kind of highly resistance immunity difference camera signals processing circuit as described in claim 1, it is characterised in that: the capacitor
Device C1 is filter condenser, the grounding interference signal on output signal cathode CVBS- end line for filtering out the camera.
5. a kind of highly resistance immunity difference camera signals processing circuit as described in claim 1, it is characterised in that: the resistance
Device R1, resistor R2 are for keeping difference monitoring voltage equal, to eliminate the output signal cathode CVBS- end line of the camera
On common-mode voltage interference.
6. a kind of highly resistance immunity difference camera signals processing circuit as described in claim 1, it is characterised in that: the capacitor
Device C2 is used to absorb the difference of the output signal anode CVBS+ of the camera and the output signal cathode CVBS- of the camera
Mould signal interference.
7. a kind of highly resistance immunity difference camera signals processing circuit as described in claim 1, it is characterised in that: the resistance
Device R3 and resistor R4 forms potential-divider network, and the resistor R5 and resistor R6 form potential-divider network, be used for the camera shooting
The signal of the output signal anode CVBS+ of head is divided to rear-class video decoding chip in the range of can bearing, while inhibiting wink
State pulse voltage reduces electric current, protects rear-class video decoding chip.
8. a kind of highly resistance immunity difference camera signals processing circuit as described in claim 1, it is characterised in that: the resistance
Device R3, resistor R4, resistor R5, the resistor that resistor R6 is same error.
9. a kind of highly resistance immunity difference camera signals processing circuit as described in claim 1, it is characterised in that: the capacitor
Device C3, capacitor C4 are AC decoupling capacitors, for eliminating the DC offset voltage of incoming video signal.
10. a kind of highly resistance immunity difference camera signals processing circuit as described in claim 1 or 9, it is characterised in that: work as institute
When the output signal cathode CVBS- of the output signal anode CVBS+ or the camera that state camera are shorted to cell voltage,
" resistor R3, resistor R4 and capacitor C3 " or " resistor R5, resistor R6 and resistor C4 " can reduce and be input to down
The voltage and current of level-one video decoding chip, effective protection video decoding chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910201047.7A CN109802748B (en) | 2019-03-18 | 2019-03-18 | High-immunity differential camera signal processing circuit |
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|---|---|---|---|
| CN201910201047.7A CN109802748B (en) | 2019-03-18 | 2019-03-18 | High-immunity differential camera signal processing circuit |
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| CN109802748A true CN109802748A (en) | 2019-05-24 |
| CN109802748B CN109802748B (en) | 2023-08-25 |
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