CN208063300U - Vehicle-mounted camera video output circuit - Google Patents
Vehicle-mounted camera video output circuit Download PDFInfo
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- CN208063300U CN208063300U CN201820402488.4U CN201820402488U CN208063300U CN 208063300 U CN208063300 U CN 208063300U CN 201820402488 U CN201820402488 U CN 201820402488U CN 208063300 U CN208063300 U CN 208063300U
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Abstract
The embodiment of the utility model provides a vehicle-mounted camera video output circuit, including integrated image processor who has operational amplifier, image processor has the reference voltage pin and is used for exporting differential video signal's first difference signal pin and second difference signal pin, first difference signal pin connects the positive pole of first diode D1, second difference signal pin connects the positive pole of second diode D2, two inputs of filter module are connected respectively to first diode D1 and second diode D2's negative pole, two outputs of filter module are connected to first difference video signal output and second difference video signal output respectively through first resistance R1 and second resistance R2 again; the reference voltage pin is connected to a third resistor R3 for adjusting the amplification gain of the operational amplifier, and the other end of the third resistor R3 is grounded. The utility model discloses with the corresponding simple circuit of image processor cooperation can realize that the difference voltage value enlargies, saved video amplifier integrated chip, it is with low costs.
Description
Technical field
The utility model embodiment is related to vehicle-mounted camera technical field more particularly to a kind of output of vehicle-mounted camera video
Circuit.
Background technology
Currently, vehicle-mounted camera is more and more universal, entrucking rate is gradually increased.Future, with intelligent automobile and automatic Pilot
Development, each automobile will device more than one auxiliary camera.The output circuit of simulation camera has the video amplifier
Integrated chip is used for amplified analog signal, while having the function of electrical protection.It is a kind of common video output circuit shown in Fig. 1,
In figure, VON_1 and VOP_1 is ISP respectively（Image Signal Processor, image processor）Output difference vision signal
Positive and negative anodes, signal amplitude is 1Vp-p, difference video signal is amplified 2 times through video amplifier integrated chip U2 processing, i.e.,
The signal amplitude of N_OUT1 and P_OUT1 is 2Vp-p.If N_OUT1 and P_OUT1 connects display load, outputting standard
CVBS signals.The cost of the existing entire circuit of vehicle-mounted camera is higher and occupies larger PCB surface product, camera shooting area of bed compared with
Greatly, it cannot be satisfied the requirement of miniaturization.By analysis and ADA4433 databooks are inquired, the video amplifier removes video amplifier
Effect, be also equipped with the safeguard function that two video output terminals of camera are shorted to 12 volts of power supplys, this is that vehicle-mounted camera is electrical
One of performance requirement.
Utility model content
The utility model embodiment technical problems to be solved are, provide a kind of vehicle-mounted camera video output circuit,
The amplification to the difference video signal of output can be realized in a manner of inexpensive.
In order to solve the above technical problems, the utility model embodiment uses following technical scheme：A kind of vehicle-mounted camera regards
Frequency output circuit, including be integrated with the image processor of operational amplifier, described image processor have reference voltage pin with
And the first differential signal pin and the second differential signal pin for output difference vision signal, first differential signal draw
Foot connects the anode of the first diode D1, and the second differential signal pin connects the anode of the second diode D2, the one or two pole
The cathode of pipe D1 and the second diode D2 are separately connected two input terminals of filter module, and two of the filter module are defeated
Outlet is connected to the first difference video signal output end by first resistor R1 and second resistance R2 respectively again and the second difference regards
Frequency signal output end；The reference voltage pin is connected with the 3rd resistor of the gain amplifier for adjusting the operational amplifier
The other end of R3,3rd resistor R3 are grounded.
Further, the vehicle-mounted camera video output circuit further includes the 4th resistance R4 and the 5th resistance R5, wherein
One end of the 4th resistance R4 be grounded and the other end be connected to the first diode D1 and filter module correspondence input terminal it
Between circuit；One end of the 5th resistance R5 is grounded and the other end is connected to the correspondence of the second diode D2 and filter module
Circuit between input terminal.
Further, the vehicle-mounted camera video output circuit further includes one end ground connection and the other end is connected to the first electricity
Hinder the circuit between R1 and the first difference video signal output end the first bi-directional voltage stabilizing diode D3 and one end ground connection and it is another
One end is connected to the second bi-directional voltage stabilizing diode D4 of circuit between second resistance R2 and the second difference video signal output end.
Further, the filter module is two-stage Pi mode filters, including the first inductance L1, the second inductance L2, the
Three inductance L3 and the 4th inductance L4, the first capacitance C1, the second capacitance C2, third capacitance C3, wherein the first inductance L1 and
Three inductance L3 connect and are connected between the cathode and first resistor R1 of the first diode D1, the electricity of the second inductance L2 and the 4th
Sense L4 connects and is connected between the cathode and second resistance R2 of the second diode D2, and the both ends of the first capacitance C1 connect respectively
Connect the cathode of the first diode D1 and the second diode D2, the both ends of the second capacitance C2 be connected to the first inductance L1 and
The circuit between circuit and the second inductance L2 and the 4th inductance L4 between third inductance L3, the both ends of the third capacitance C3
Circuit between the circuit and the 4th inductance L4 and second resistance R2 that are separately connected between third inductance L3 and first resistor R1.
Further, the vehicle-mounted camera video output circuit further include the first test point TP1, the second test point TP2,
Third test point TP3, the 4th test point TP4, wherein the first test point TP1 is connected to the anode of the first diode D1, institute
The anode that the second test point TP2 is connected to the second diode D2 is stated, the third test point TP3 is connected to filter module and
Circuit between one resistance R1, the third test point TP3 are connected to the circuit between filter module and second resistance R2.
Using above-mentioned technical proposal, the utility model embodiment at least has the advantages that：The utility model institute is real
The video output circuit for applying the camera video output circuit that example is taken is only simple with filter module, diode, resistance etc.
Circuit components and the image processor for being integrated with operational amplifier coordinate, you can realize putting to the difference video signal of output
Greatly, video amplifier integrated chip is eliminated, component cost is saved and reduces PCB sizes, using the video output circuit
Vehicle-mounted camera it is at low cost, small, the demand of user can be better met.
Description of the drawings
Fig. 1 is a kind of circuit diagram of existing video output circuit.
Fig. 2 is the circuit diagram of the utility model vehicle-mounted camera video output circuit one embodiment.
Specific implementation mode
The utility model is described in further detail in the following with reference to the drawings and specific embodiments.It should be appreciated that below
Illustrative examples and explanation are only used for explaining the utility model, be not intended to limit the scope of the present invention, moreover, not rushing
In the case of prominent, the feature in the embodiments of the present invention and embodiment can be combined with each other.
As shown in Fig. 2, the utility model one embodiment provides a kind of vehicle-mounted camera video output circuit, including it is integrated
There is the image processor of operational amplifier（ISP）, described image processor is with reference voltage pin and is used for output difference
The the first differential signal pin and the second differential signal pin of vision signal, the first differential signal pin connect the one or two pole
The anode of pipe D1, the second differential signal pin connect the anode of the second diode D2, the first diode D1 and the two or two pole
The cathode of pipe D2 is separately connected two input terminals of filter module, and two output ends of the filter module pass through respectively again
First resistor R1 and second resistance R2 is connected to the first difference video signal output end N_OUT and the output of the second difference video signal
Hold P_OUT；The reference voltage pin is connected with the 3rd resistor R3 of the gain amplifier for adjusting the operational amplifier, the
The other end of three resistance R3 is grounded.
The video output circuit for the camera video output circuit that the present embodiment is taken is only with filter module, the one or two pole
The simple circuit components such as pipe D1, the second diode D2, first resistor R1, second resistance R2 and it is integrated with operational amplifier
Image processor coordinate, sharp diode unilateral conduction characteristic, realize circuit reversal connection act on protective effect, setting first resistor R1 and
Second resistance R2 can realize the constant characteristic of output resistance, such as：Constant is 120ohm；ISP is also effectively utilized to be internally integrated
Operational amplifier, by change be connected to ISP reference voltage pins DAC_REF resistance R3 resistance value, so as to effectively change
The gain amplifier for becoming operational amplifier, finally makes the first difference video signal output end N_OUT and the second difference video signal defeated
The difference video signal of outlet P_OUT outputs is amplified, such as：Than the voltage of difference video signal between VON_1 and VOP_1
2 times of value amplification.As it can be seen that putting to the difference video signal of output can be realized with simple circuit in the utility model embodiment
Greatly, video amplifier integrated chip is eliminated, component cost is saved and reduces PCB sizes, using the video output circuit
Vehicle-mounted camera it is at low cost, small, the demand of user can be better met.
In one alternative embodiment of the utility model, the vehicle-mounted camera video output circuit further includes the 4th resistance
R4 and the 5th resistance R5, wherein one end of the 4th resistance R4 is grounded and the other end is connected to the first diode D1 and filtering
Circuit between the correspondence input terminal of device module；One end of the 5th resistance R5 is grounded and the other end is connected to the second diode
Circuit between D2 and the correspondence input terminal of filter module.The present embodiment is by being further arranged the electricity of the 4th resistance R4 and the 5th
R5 is hindered, the continuous constant effect of video signal transmission impedance can be played, such as：It is constant at 120ohm.
Further, the vehicle-mounted camera video output circuit further includes one end ground connection and the other end is connected to the first electricity
Hinder the first bi-directional voltage stabilizing diode D3 and one end ground connection of the circuit between R1 and the first difference video signal output end N_OUT
And the other end is connected to the second bi-directional voltage stabilizing two of circuit between second resistance R2 and the second difference video signal output end P_OUT
Pole pipe D4.The present embodiment can make the by the way that the first bi-directional voltage stabilizing diode D3 and the second bi-directional voltage stabilizing diode D4 is arranged
The electricity of one difference video signal output end N_OUT and the difference video signal of the second difference video signal output end P_OUT outputs
Pressure value keeps relative stability.
Further, the filter module is two-stage Pi mode filters, including the first inductance L1, the second inductance L2, the
Three inductance L3 and the 4th inductance L4, the first capacitance C1, the second capacitance C2, third capacitance C3, wherein the first inductance L1 and
Three inductance L3 connect and are connected between the cathode and first resistor R1 of the first diode D1, the electricity of the second inductance L2 and the 4th
Sense L4 connects and is connected between the cathode and second resistance R2 of the second diode D2, and the both ends of the first capacitance C1 connect respectively
Connect the cathode of the first diode D1 and the second diode D2, the both ends of the second capacitance C2 be connected to the first inductance L1 and
The circuit between circuit and the second inductance L2 and the 4th inductance L4 between third inductance L3, the both ends of the third capacitance C3
Circuit between the circuit and the 4th inductance L4 and second resistance R2 that are separately connected between third inductance L3 and first resistor R1.
The present embodiment forms two-stage Pi mode filters by multiple capacitances and multiple inductor combinations, can simple component realization circuit
It is filtered.
Further, the vehicle-mounted camera video output circuit further include the first test point TP1, the second test point TP2,
Third test point TP3, the 4th test point TP4, wherein the first test point TP1 is connected to the anode of the first diode D1, institute
The anode that the second test point TP2 is connected to the second diode D2 is stated, the third test point TP3 is connected to filter module and
Circuit between one resistance R1, the third test point TP3 are connected to the circuit between filter module and second resistance R2.This
Embodiment is by reserved corresponding multiple test points, the test that can be used in camera industrialized mass production, facilitate test and
Improve manufacture product qualified rate.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art,
It is appreciated that can these embodiments be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaiied
Change, replace and modification, the scope of the utility model are limited by appended claims and its equivalency range.
Claims (5)
1. a kind of vehicle-mounted camera video output circuit, including it is integrated with the image processor of operational amplifier, at described image
Reason utensil has reference voltage pin and for the first differential signal pin of output difference vision signal and the second differential signal
Pin, which is characterized in that the first differential signal pin connects the anode of the first diode D1, and the second differential signal pin connects
Connect the anode of the second diode D2, the cathode of the first diode D1 and the second diode D2 are separately connected filter module
Two output ends of two input terminals, the filter module are connected to by first resistor R1 and second resistance R2 respectively again
One difference video signal output end and the second difference video signal output end；The reference voltage pin is connected with for adjusting
State the 3rd resistor R3 of the gain amplifier of operational amplifier, the other end ground connection of 3rd resistor R3.
2. vehicle-mounted camera video output circuit as described in claim 1, which is characterized in that the vehicle-mounted camera video is defeated
It further includes the 4th resistance R4 and the 5th resistance R5 to go out circuit, wherein one end of the 4th resistance R4 is grounded and the other end connects
Circuit between the first diode D1 and the correspondence input terminal of filter module；One end of the 5th resistance R5 is grounded and another
One end is connected to the circuit between the second diode D2 and the correspondence input terminal of filter module.
3. vehicle-mounted camera video output circuit as described in claim 1, which is characterized in that the vehicle-mounted camera video is defeated
Go out that circuit further includes one end ground connection and the other end is connected to line between first resistor R1 and the first difference video signal output end
The first bi-directional voltage stabilizing diode D3 on road and one end are grounded and the other end is connected to second resistance R2 and the second differential video letter
Second bi-directional voltage stabilizing diode D4 of circuit between number output end.
4. the vehicle-mounted camera video output circuit as described in claims 1 or 2 or 3, which is characterized in that the filter module
For two-stage Pi mode filters, including the first inductance L1, the second inductance L2, third inductance L3 and the 4th inductance L4, the first capacitance C1,
Second capacitance C2, third capacitance C3, wherein the first inductance L1 and third inductance L3 connects and is connected to the first diode D1
Cathode and first resistor R1 between, the second inductance L2 and the 4th inductance L4 connect and are connected to the negative of the second diode D2
Between pole and second resistance R2, the both ends of the first capacitance C1 are separately connected the negative of the first diode D1 and the second diode D2
The both ends of pole, the second capacitance C2 are connected to circuit and the second inductance between the first inductance L1 and third inductance L3
Circuit between L2 and the 4th inductance L4, the both ends of the third capacitance C3 be separately connected third inductance L3 and first resistor R1 it
Between circuit and the 4th inductance L4 and second resistance R2 between circuit.
5. vehicle-mounted camera video output circuit as described in claim 1, which is characterized in that the vehicle-mounted camera video is defeated
It further includes the first test point TP1, the second test point TP2, third test point TP3, the 4th test point TP4 to go out circuit, wherein described
First test point TP1 is connected to the anode of the first diode D1, and the second test point TP2 is being connected to the second diode D2 just
Pole, the third test point TP3 are connected to the circuit between filter module and first resistor R1, the third test point TP3
The circuit being connected between filter module and second resistance R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820402488.4U CN208063300U (en) | 2018-03-23 | 2018-03-23 | Vehicle-mounted camera video output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820402488.4U CN208063300U (en) | 2018-03-23 | 2018-03-23 | Vehicle-mounted camera video output circuit |
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| Publication Number | Publication Date |
|---|---|
| CN208063300U true CN208063300U (en) | 2018-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820402488.4U Active CN208063300U (en) | 2018-03-23 | 2018-03-23 | Vehicle-mounted camera video output circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108259704A (en) * | 2018-03-23 | 2018-07-06 | 深圳市豪恩汽车电子装备股份有限公司 | vehicle-mounted camera video output circuit |
-
2018
- 2018-03-23 CN CN201820402488.4U patent/CN208063300U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108259704A (en) * | 2018-03-23 | 2018-07-06 | 深圳市豪恩汽车电子装备股份有限公司 | vehicle-mounted camera video output circuit |
| CN108259704B (en) * | 2018-03-23 | 2024-04-30 | 深圳市豪恩汽车电子装备股份有限公司 | Video output circuit of vehicle-mounted camera |
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