CN207571881U - The circuit of interrupt signal is extracted in a kind of CVBS signals from reversing - Google Patents
The circuit of interrupt signal is extracted in a kind of CVBS signals from reversing Download PDFInfo
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- CN207571881U CN207571881U CN201721743255.2U CN201721743255U CN207571881U CN 207571881 U CN207571881 U CN 207571881U CN 201721743255 U CN201721743255 U CN 201721743255U CN 207571881 U CN207571881 U CN 207571881U
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Abstract
The utility model discloses the circuits that interrupt signal is extracted in a kind of CVBS signals from reversing, with sequentially connected Current amplifier module, detection module, low-pass filtering module, drive module, wherein Current amplifier module connects the CVBS signals, output current amplified signal；Detection module carries out detection to the Current amplifier signal of Current amplifier module output；Low-pass filtering module carries out low-pass filtering to the signal after detection, isolates d. c. voltage signal；Drive module is driven by the d. c. voltage signal, sends out interrupt signal；Compared with prior art, the utility model saves an astern signal line, and interrupt signal is directly extracted from the CVBS signals of camera, and so as to make, wiring is less, more succinct, stability is high, reduces vehicle cost.
Description
Technical field
The utility model is related to extract figure in automotive control circuit more particularly to a kind of rear camera CVBS signals from reversing
As the circuit of interrupt signal.
Background technology
Modern vehicle is mostly equipped with vehicle rear camera, and image plays out after intake vehicle when reversing, to help to drive
The person of sailing drives safely.In the prior art, vehicle rear camera has the CPU of a control signal wire connection console, in reversing time control
Signal wire processed will give one interrupt signal of control human hair combing waste of CPU, CPU just can be aobvious to middle control by screen switching after receiving interrupt signal
In display screen.Due to there is control signal wire, thus puzzlement is increased to the wiring of backup camera.Therefore there is an urgent need for exploitations one in the industry
Kind directly extracts the circuit of interrupt signal in the case of no astern signal line in the CVBS signals of reversing rear camera.
Utility model content
The utility model is the above problem of the prior art to be solved, and proposes that one kind without astern signal line, can directly exist
The circuit of interrupt signal is extracted in the CVBS signals for rear camera of moving backward.
In order to solve the above technical problems, the utility model proposes technical solution be in a kind of CVBS signals from reversing of design
The circuit of interrupt signal is extracted, there is sequentially connected Current amplifier module, detection module, low-pass filtering module, drive module,
Wherein Current amplifier module connects the CVBS signals, output current amplified signal；Detection module, it is defeated to Current amplifier module
The Current amplifier signal gone out carries out detection；Low-pass filtering module carries out low-pass filtering to the signal after detection, isolates direct current
Press signal；Drive module is driven by the d. c. voltage signal, sends out interrupt signal.
The Current amplifier module has the 8th triode, and the 8th triode uses PNP type triode, and emitter connects directly
Stream positive pole VCC, its base stage connects one end of the 93rd resistance, its collector connects one end of the 96th resistance and exports institute
State Current amplifier signal, one end and the 91st and the 9th of the 89th capacitance of another termination of the 93rd resistance
One end of 14 resistance, another termination CVBS signals of the 89th capacitance, the 96th resistance and the
The other end ground connection of 94 resistance, another termination DC power anode VCC of the 91st resistance.
The detection module has detector diode, and anode connects the Current amplifier signal, its cathode connects the low pass
Filter module.
The low-pass filtering module has the 95th resistance, and one end connects one end of the 91st capacitance and the inspection
The cathode of wave diode, the other end connect one end of the 97th resistance and convey the d. c. voltage signal, and the 91st
The other end of capacitance and the 97th resistance is grounded.
The drive module has the 9th triode, and the 9th triode uses NPN type triode, and base stage connects the direct current
Voltage signal, emitter ground connection, collector connect one end of the 92nd resistance and the 90th capacitance and send out the interruption
Signal, the other end ground connection of the 90th capacitance, another termination positive pole IO_VCC of the 92nd resistance.
Compared with prior art, the utility model saves an astern signal line, and interrupt signal is directly from camera
It is extracted in CVBS signals, so as to make, wiring is less, more succinct, stability is high, reduces vehicle cost.
Description of the drawings
Fig. 1 is the functional-block diagram of the utility model preferred embodiment；
Fig. 2 is the circuit diagram of the utility model preferred embodiment.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is described in further detail the utility model.It should be appreciated that specific embodiment described herein is used only for explaining this
Utility model is not used to limit the utility model.
The utility model discloses the circuit that interrupt signal is extracted in a kind of CVBS signals from reversing, referring to shown in Fig. 1
Functional-block diagram, reversing rear camera send out CVBS signals, and CVBS picture signals are divided into two two-way and are handled respectively, and one
Give the signal input port of middle control in road；Another way signal is sent to interrupt signal extraction circuit, and interrupt signal is extracted
The control foot of CPU is sent to, it can control display screen broadcasting back-up video after the interrupt signal of CPU detections.Interrupt signal is extracted
Circuit has sequentially connected Current amplifier module, detection module, low-pass filtering module, drive module.
Wherein Current amplifier module connects the CVBS signals, CVBS signals is amplified, and makes the promotion ability of signal
Increase output current amplified signal；Detection module carries out detection to the Current amplifier signal of Current amplifier module output；Low pass filtered
Wave module carries out low-pass filtering to the signal after detection, isolates d. c. voltage signal；Drive module, by the DC voltage
Signal drives, and interrupt signal is sent out to CPU.
Referring to Fig. 2 shows preferred embodiment circuit diagram, the Current amplifier module have the 8th triode Q8, the 8th
Triode uses PNP type triode, and emitter meets DC power anode VCC, its base stage connects the one of the 93rd resistance R93
End, its collector connect one end of the 96th resistance and export the Current amplifier signal, the 93rd resistance it is another
One end of the 89th capacitance C89 and one end of the 91st and the 94th resistance are terminated, the 89th capacitance
Another termination CVBS signals, the 96th resistance R96 and the 94th resistance R94 other end are grounded, and the 9th
Another termination DC power anode VCC of 11 resistance R91.This Current amplifier module can amplify CVBS signals, with big
Promotion ability.
Referring to Fig. 2 shows preferred embodiment circuit diagram, the detection module has detector diode D8, and anode connects
The Current amplifier signal, its cathode connect the low-pass filtering module.Using diode unilateal conduction characteristic, Current amplifier is believed
Negative-going portion in number is truncated, and only leaves its positive part.
Referring to Fig. 2 shows preferred embodiment circuit diagram, the low-pass filtering module have the 95th resistance R95,
One end connects one end of the 91st capacitance C91 and the cathode of the detector diode, the 97th electricity of other end connection
It hinders one end of R97 and conveys the d. c. voltage signal, the other end ground connection of the 91st capacitance and the 97th resistance.Low pass
Circuit may separate out DC component to control the drive module.
Referring to Fig. 2, the drive module has the 9th triode Q9, and the 9th triode uses NPN type triode, base stage
The d. c. voltage signal, emitter ground connection are connect, collector meets the one of the 92nd resistance R92 and the 90th capacitance C90
It holds and sends out the interrupt signal, the other end ground connection of the 90th capacitance, another termination positive pole of the 92nd resistance
（IO_VCC）.It may be noted that aforementioned DC power anode VCC is supply voltage, the power supply above the 92nd resistance is arm
The IO voltages that system is powered to CPU.
After rear camera has the output of CVBS signals, C91 upper ends can assemble high voltage, the base stage warp of the 9th triode Q9
High potential is obtained after crossing R95 and R97 partial pressures, and Q9 saturation conductions drag down its collector voltage after Q9 saturation conductions（It is close
0V）, so as to make CPU（GPIO）Foot is controlled by high level（1.8V）Become low level, CPU detects GPIO by height（1.8V）Become
Reversing picture will be switched to after low；Interrupt signal is extracted so as to fulfill from the CVBS signals of backup camera.
Above example is by way of example only, non-to provide constraints.It is any without departing from the application spirit and scope, and to it
The equivalent modifications of progress or change, shall be included in the scope of claims of this application.
Claims (5)
1. the circuit of interrupt signal is extracted in a kind of CVBS signals from reversing, it is characterised in that including：Sequentially connected electric current is put
Big module, detection module, low-pass filtering module, drive module, wherein
Current amplifier module connects the CVBS signals, output current amplified signal；
Detection module carries out detection to the Current amplifier signal of Current amplifier module output；
Low-pass filtering module carries out low-pass filtering to the signal after detection, isolates d. c. voltage signal；
Drive module is driven by the d. c. voltage signal, sends out interrupt signal.
2. the circuit of interrupt signal is extracted from reversing CVBS signals as described in claim 1, it is characterised in that：The electric current
Amplification module has the 8th triode（Q8）, the 8th triode uses PNP type triode, and emitter connects DC power anode
（VCC）, its base stage connect the 93rd resistance（R93）One end, its collector connect described in one end and the output of the 96th resistance
Current amplifier signal, the 89th capacitance of another termination of the 93rd resistance（C89）One end and the 91st He
One end of 94th resistance, another termination CVBS signals of the 89th capacitance, the 96th resistance
（R96）And the 94th resistance（R94）The other end ground connection, the 91st resistance（R91）Another termination DC power supply just
Pole.
3. the circuit of interrupt signal is extracted from reversing CVBS signals as claimed in claim 2, it is characterised in that：The detection
Module has detector diode（D8）, anode connects the Current amplifier signal, its cathode connects the low-pass filtering module.
4. the circuit of interrupt signal is extracted from reversing CVBS signals as claimed in claim 3, it is characterised in that：The low pass
Filter module has the 95th resistance（R95）, one end the 91st capacitance of connection（C91）Two pole of one end and the detection
The cathode of pipe, the other end connect the 97th resistance（R97）One end and convey the d. c. voltage signal, the 91st electricity
Hold and the other end of the 97th resistance is grounded.
5. the circuit of interrupt signal is extracted from reversing CVBS signals as claimed in claim 4, it is characterised in that：The driving
Module has the 9th triode（Q9）, the 9th triode uses NPN type triode, and base stage connects the d. c. voltage signal,
Emitter is grounded, and collector connects the 92nd resistance（R92）With the 90th capacitance（C90）One end and send out it is described interrupt letter
Number, the other end ground connection of the 90th capacitance, another termination positive pole of the 92nd resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721743255.2U CN207571881U (en) | 2017-12-14 | 2017-12-14 | The circuit of interrupt signal is extracted in a kind of CVBS signals from reversing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721743255.2U CN207571881U (en) | 2017-12-14 | 2017-12-14 | The circuit of interrupt signal is extracted in a kind of CVBS signals from reversing |
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| Publication Number | Publication Date |
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| CN207571881U true CN207571881U (en) | 2018-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110830792A (en) * | 2019-10-24 | 2020-02-21 | 珠海全志科技股份有限公司 | Device for detecting automobile rearview analog video and using method thereof |
-
2017
- 2017-12-14 CN CN201721743255.2U patent/CN207571881U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110830792A (en) * | 2019-10-24 | 2020-02-21 | 珠海全志科技股份有限公司 | Device for detecting automobile rearview analog video and using method thereof |
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