CN109782235A - A kind of anti-jamming circuit of 77GHz automobile collision avoidance radar - Google Patents
A kind of anti-jamming circuit of 77GHz automobile collision avoidance radar Download PDFInfo
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- CN109782235A CN109782235A CN201910089271.1A CN201910089271A CN109782235A CN 109782235 A CN109782235 A CN 109782235A CN 201910089271 A CN201910089271 A CN 201910089271A CN 109782235 A CN109782235 A CN 109782235A
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Abstract
The invention discloses a kind of anti-jamming circuits of 77GHz automobile collision avoidance radar, including isolation sub-circuit, the first pressure stabilizing sub-circuit, the second pressure stabilizing sub-circuit, isolation and filtering sub-circuit and anti-interference sub-circuit.Circuit structure of the present invention is simple, and practical and ambient adaptability is higher, can take into account a plurality of types of 77GHz radio frequency chips and microcontroller chip etc., brings great convenience to the debugging and use of the product of different model and realizability.All circuit devcies and circuit design in the present invention are realized according to electromagnetic compatibility consideration, the influence of power supply noise etc. is substantially reduced in the case where meeting automobile collision avoidance radar circuit function requirements, the quality of signal transmission is also improved simultaneously, has the characteristics that at low cost, strong antijamming capability and adaptable, there is good matching simultaneously, it is suitable for mass production, the test development and practical application suitable for all kinds of car radar products.
Description
Technical field
The invention belongs to digital communication technical field of electronic devices, and in particular to a kind of 77GHz automobile collision avoidance radar resists
Interfere the design of circuit.
Background technique
With the raising of quality of the life, the increase of automobile quantity, accident rate is also constantly rising, vehicle driving safety
Also by everybody attention and concern.One hot spot of motor field current research is exactly automobile collision avoidance radar product, and is based on
77GHz automobile collision avoidance radar is because the feature that environment resistant interference performance is strong, stability is high is widely studied.
77GHz automobile collision avoidance radar product is mainly made of antenna, transceiver, signal processing module and power module etc..
Based on CW with frequency modulation (FMCW) system, multi-target detection may be implemented, detect vehicle spacing farthest up to 260m, in this model
It is capable of the relative distance of the multiple vehicles in real-time monitoring front in enclosing, is analyzed and determined out risk according to multiple targets are detected,
And processing quick response is carried out according to multi-objective Algorithm, the operation such as alarm warning, deceleration or brake is provided, vehicle is effectively avoided
Risk factor in driving process.
Due to thering is multiple power supplies, digital signal, analog signal and radiofrequency signal to exist simultaneously in automobile collision avoidance radar, circuit
Middle any one signal, which seals in, just will form certain interference in other signal circuits, it is easy to cause to interfere with each other, especially
The micro-control unit of automobile collision avoidance radar is interfered, causes data to acquire deviation, false-alarm targets occurs.Some signals can also
To be passed in electronic circuit by certain circuit, actual target data is interfered, data is caused to acquire mistake.While by
In the uncertainty of working environment, external interference can also influence signal, be directly related to automotive safety reliability, because
The design of this anti-jamming circuit is essential.
Summary of the invention
The purpose of the present invention is to solve the cross-interference issues between 77GHz automobile collision avoidance radar signal, propose one kind
The anti-jamming circuit of 77GHz automobile collision avoidance radar has that structure is simple, subtracts in the case where meeting automobile collision avoidance radar performance
Few noise jamming reduces the advantages that distortion, the anti-electromagnetic compatibility of signal, low cost in signal transmission, in use flexibility
Well, environmental suitability is strong, is with a wide range of applications.
The technical solution of the present invention is as follows: a kind of anti-jamming circuit of 77GHz automobile collision avoidance radar, including isolation sub-circuit,
First pressure stabilizing sub-circuit, the second pressure stabilizing sub-circuit, isolation and filtering sub-circuit and anti-interference sub-circuit.The defeated of sub-circuit is isolated
Enter the input voltage VI1 of end connection external dc power, output end respectively with the input terminal of the first pressure stabilizing sub-circuit and the
The input terminal of two pressure stabilizing sub-circuits connects, the output end output voltage VO 1 of the first pressure stabilizing sub-circuit, and provides it to 77GHz
The main power pin of automobile collision avoidance radar microcontroller；The output end of second pressure stabilizing sub-circuit be isolated and filter the defeated of sub-circuit
Enter the output end output voltage VO 2 of end connection, isolation and filtering sub-circuit, and it is micro- to provide it to 77GHz automobile collision avoidance radar
The digital communication power pin of controller；The first input end input of anti-interference sub-circuit is penetrated from 77GHz automobile collision avoidance radar
The differential signal DIVN of frequency acquisition module, the second input terminal are inputted from 77GHz automobile collision avoidance radar RF acquisition module
Differential signal DIVP, the first output end output signal DIVN_AD, second output terminal output signal DIVP_AD, signal
DIVN_AD and DIVP_AD is both provided to the function pin of 77GHz automobile collision avoidance radar microcontroller.
Further, isolation sub-circuit include model 2920L150 fuse U12, the 1st pin of fuse U12 with
One end of capacitor C3 connects, and the input terminal as isolation sub-circuit, and the 2nd pin of fuse U12 and one end of inductance L1 connect
Connect, the other end of inductance L1 respectively with one end of capacitor C7, one end of capacitor C8, the cathode of diode V2, capacitor C14 one end
And one end connection of inductance L12；The other end of inductance L12 is the output end that sub-circuit is isolated, the anode and two of diode V2
The anode connection of pole pipe V3, the other end of capacitor C14 are connect with one end of capacitor C15；The other end of capacitor C3 respectively with capacitor
One end connection of the other end of C7, the other end of capacitor C8, the cathode of diode V3, the other end of capacitor C15 and inductance L13
And it is grounded, the other end ground connection of inductance L13.
Further, the first pressure stabilizing sub-circuit includes the voltage-stablizer U16 of model Lp5912q3v3, and the 1st of voltage-stablizer U16 the
Pin is connect with one end of one end of resistance R40, one end of capacitor C139 and capacitor C140 respectively, and as the first pressure stabilizing
The output end of circuit, the other end of resistance R40 are connect with the 3rd pin of voltage-stablizer U16, the other end and capacitor of capacitor C139
One end connect and ground of C140；The 4th pin of voltage-stablizer U16 respectively with the 6th pin of voltage-stablizer U16, capacitor C136 one
End and the connection of one end of capacitor C137, and the input terminal as the first pressure stabilizing sub-circuit, the 5th pin difference of voltage-stablizer U16
With the 7th pin, the other end of capacitor C136 and the other end connect and ground of capacitor C137 of voltage-stablizer U16.
Further, the second pressure stabilizing sub-circuit includes the voltage-stablizer U2 of model Tps74801, the 5th pin of voltage-stablizer U2
Respectively with the 6th pin, the 7th pin, the 8th pin, the 10th pin, the 11st pin, ground capacity C1 and the ground connection of voltage-stablizer U2
15th pin of capacitor C2 connection, and the input terminal as the second pressure stabilizing sub-circuit, voltage-stablizer U2 connects ground capacity C5, pressure stabilizing
The 12nd pin of device U2 and the 21st pin are grounded；The 1st pin of voltage-stablizer U2 respectively with the 18th pin of voltage-stablizer U2, the 19th
Pin, the 20th pin, one end of resistance R1, one end of resistance R2, ground capacity C11 and ground capacity C12 connection, and conduct
The output end of second pressure stabilizing sub-circuit, the other end of resistance R1 are connect with the 9th pin of voltage-stablizer U2, the other end point of resistance R2
It is not connect with the 16th pin and ground resistance R3 of voltage-stablizer U2.
Further, being isolated and filtering sub-circuit includes the driver U19 of model SN6501-Q1, model
The voltage-stablizer U21 of the transformer T1 and model Tps76350 of We760390014.The 1st pin and transformer of driver U19
The 1st pin of T1 connects, the 2nd pin of driver U19 respectively with the 2nd pin of transformer T1, ground capacity C164 and connect
Ground capacitor C165 connection, and as the input terminal for being isolated and filtering sub-circuit, the 3rd pin of driver U19 is with transformer T1's
The connection of 3rd pin, the 4th pin of driver U19 and the 5th pin are grounded；The 4th pin of transformer T1 is with diode V10's
Anode connection, the 5th pin of transformer T1 respectively with one end of capacitor C166, one end of capacitor C167 and voltage-stablizer U21
2nd pin connect and ground, the 6th pin of transformer T1 are connect with the anode of diode V11, the cathode difference of diode V10
Connect with the 3rd pin of the cathode of diode V11, the other end of capacitor C166, the 1st pin of voltage-stablizer U21 and voltage-stablizer U21
It connects, the 5th pin of voltage-stablizer U21 is connect with the other end of capacitor C167, and as the output end for being isolated and filtering sub-circuit.
Further, anti-interference sub-circuit include resistance R81, R82, R83, R84, capacitor C124, C125, C16, C168 with
And inductance L17, L18, L19 and L20.One end of resistance R81 is the first input end of anti-interference sub-circuit, and the other end passes through electricity
Sense L17 is connect with one end of one end of capacitor C16 and inductance L19 respectively；One end of resistance R83 is the of anti-interference sub-circuit
Two input terminals, the other end are connect with one end of one end of capacitor C168 and inductance L20 respectively by inductance L18；Capacitor
One end of C124 is the first output end of anti-interference sub-circuit, the other end respectively with one end of resistance R82 and inductance L19
Other end connection；One end of capacitor C125 be anti-interference sub-circuit second output terminal, the other end respectively with resistance R84 one
The connection of the other end of end and inductance L20；The other end of capacitor C16, the other end of capacitor C168, resistance R82 the other end with
And the other end of resistance R84 is grounded.
The beneficial effects of the present invention are:
(1) present invention is carried out external dc power by isolation sub-circuit and the first concatenated design of pressure stabilizing sub-circuit
Main power pin after filtering processing and isolation processing again for 77GHz automobile collision avoidance radar microcontroller is powered, can be very
Power supply noise is reduced well and switching frequency is crosstalked into radio frequency part, is solved power supply in 77GHz automobile collision avoidance radar circuit and is made an uproar
The problem of sound.
(2) present invention is in the digital communication part of 77GHz automobile collision avoidance radar using isolation sub-circuit, the second pressure stabilizing son electricity
Road and isolation and the filtering concatenated form of sub-circuit are equal to the digital communication confession for 77GHz automobile collision avoidance radar microcontroller
Fulgurite foot provides the power supply all the way with isolation, significantly reduces mutual dry in automobile collision avoidance radar circuit use process
It disturbs, solves the cross-interference issue in 77GHz automobile collision avoidance radar circuit between digital communication.
(3) present invention constitutes anti-interference son electricity in such a way that inductance, capacitor and resistance difference resistance value combine in series and parallel
Road, and anti-interference filtration processing is carried out using differential signal of the anti-interference sub-circuit to RF acquisition module, it effectively enhances
Signal greatly improves signal index to realize the highly-reliable transmission of differential signal, solves 77GHz automobile collision preventing
The interference problem of Radar Products differential output signal.
(4) all circuit devcies in the present invention and circuit design are realized according to electromagnetic compatibility consideration, are meeting vapour
The influence of power supply noise etc. is substantially reduced in the case where vehicle Anticollision Radar circuit function requirements, while also improving signal transmission
Quality, have the characteristics that at low cost, strong antijamming capability and adaptable, while there is good matching, be suitble to batch
Metaplasia produces, test development and practical application suitable for all kinds of car radar products.
(5) circuit structure of the present invention is simple, and practical and ambient adaptability is higher, can take into account a plurality of types of 77GHz
Radio frequency chip and microcontroller chip etc., debugging and use to the product of different model bring great convenience and can realize
Property.
Detailed description of the invention
Fig. 1 show a kind of anti-jamming circuit functional block diagram of 77GHz automobile collision avoidance radar provided in an embodiment of the present invention.
Fig. 2 show insulator circuit diagram provided in an embodiment of the present invention.
Fig. 3 show the first pressure stabilizing sub-circuit schematic diagram provided in an embodiment of the present invention.
Fig. 4 show the second pressure stabilizing sub-circuit schematic diagram provided in an embodiment of the present invention.
Fig. 5 show isolation and filtering sub-circuit schematic diagram provided in an embodiment of the present invention.
Fig. 6 show anti-interference sub-circuit schematic diagram provided in an embodiment of the present invention.
Specific embodiment
Carry out detailed description of the present invention illustrative embodiments with reference to the drawings.It should be appreciated that shown in attached drawing and
The embodiment of description is only exemplary, it is intended that is illustrated the principle and spirit of the invention, and is not limited model of the invention
It encloses.
The embodiment of the invention provides a kind of anti-jamming circuits of 77GHz automobile collision avoidance radar, as shown in Figure 1, include every
Ionising circuit, the first pressure stabilizing sub-circuit, the second pressure stabilizing sub-circuit, isolation and filtering sub-circuit and anti-interference sub-circuit.
Wherein, it is isolated the input voltage VI1 of the input terminal connection external dc power of sub-circuit, output end is respectively with the
The connection of the input terminal of the input terminal of one pressure stabilizing sub-circuit and the second pressure stabilizing sub-circuit, the output end output of the first pressure stabilizing sub-circuit
Voltage VO1, and provide it to the main power pin of 77GHz automobile collision avoidance radar microcontroller；Second pressure stabilizing sub-circuit it is defeated
Outlet be isolated and filter sub-circuit input terminal connect, isolation and filtering sub-circuit output end output voltage VO 2, and by its
It is supplied to the digital communication power pin of 77GHz automobile collision avoidance radar microcontroller；The first input end of anti-interference sub-circuit is defeated
Enter the differential signal DIVN from 77GHz automobile collision avoidance radar RF acquisition module, the input of the second input terminal comes from 77GHz vapour
The differential signal DIVP of vehicle Anticollision Radar RF acquisition module, the first output end output signal DIVN_AD, second output terminal
Output signal DIVP_AD, signal DIVN_AD and DIVP_AD are both provided to the function pipe of 77GHz automobile collision avoidance radar microcontroller
Foot.
In the embodiment of the present invention, the microcontroller of 77GHz automobile collision avoidance radar can be used MPC5774, MPC5775 or
The RF acquisition module of S32R274,77GHz automobile collision avoidance radar can be used MC33MR2001R, MC33MR2001T,
CAL77A2T4R or A770, thus the anti-jamming circuit of 77GHz automobile collision avoidance radar provided in an embodiment of the present invention can take into account it is more
The 77GHz radio frequency chip of seed type and microcontroller chip etc., debugging and use to the product of different model are brought greatly
Convenient and realizability.
As shown in Fig. 2, isolation sub-circuit includes the fuse U12 of model 2920L150, the 1st pin of fuse U12
It is connect with one end of capacitor C3, and the input terminal as isolation sub-circuit, one end of the 2nd pin and inductance L1 of fuse U12
Connection, the other end of inductance L1 respectively with one end of capacitor C7, one end of capacitor C8, the cathode of diode V2, capacitor C14 one
End and the connection of one end of inductance L12；The other end of inductance L12 be isolated sub-circuit output end, diode V2 anode with
The anode connection of diode V3, the other end of capacitor C14 are connect with one end of capacitor C15；The other end of capacitor C3 respectively with electricity
The one end for holding the other end of C7, the other end of capacitor C8, the cathode of diode V3, the other end of capacitor C15 and inductance L13 connects
It connects and is grounded, the other end ground connection of inductance L13.
As shown in figure 3, the first pressure stabilizing sub-circuit includes the voltage-stablizer U16 of model Lp5912q3v3, the of voltage-stablizer U16
1 pin is connect with one end of one end of resistance R40, one end of capacitor C139 and capacitor C140 respectively, and as the first pressure stabilizing
The output end of sub-circuit, the other end of resistance R40 are connect with the 3rd pin of voltage-stablizer U16, the other end and capacitor of capacitor C139
One end connect and ground of C140；The 4th pin of voltage-stablizer U16 respectively with the 6th pin of voltage-stablizer U16, capacitor C136 one
End and the connection of one end of capacitor C137, and the input terminal as the first pressure stabilizing sub-circuit, the 5th pin difference of voltage-stablizer U16
With the 7th pin, the other end of capacitor C136 and the other end connect and ground of capacitor C137 of voltage-stablizer U16.
As shown in figure 4, the second pressure stabilizing sub-circuit includes the voltage-stablizer U2 of model Tps74801, the 5th of voltage-stablizer U2 is drawn
Foot respectively with the 6th pin of voltage-stablizer U2, the 7th pin, the 8th pin, the 10th pin, the 11st pin, ground capacity C1 and connect
15th pin of ground capacitor C2 connection, and the input terminal as the second pressure stabilizing sub-circuit, voltage-stablizer U2 connects ground capacity C5, surely
The 12nd pin of depressor U2 and the 21st pin are grounded；The 1st pin of voltage-stablizer U2 respectively with the 18th pin of voltage-stablizer U2,
19 pins, the 20th pin, one end of resistance R1, one end of resistance R2, ground capacity C11 and ground capacity C12 connection, and make
For the output end of the second pressure stabilizing sub-circuit, the other end of resistance R1 is connect with the 9th pin of voltage-stablizer U2, the other end of resistance R2
It is connect respectively with the 16th pin and ground resistance R3 of voltage-stablizer U2.
As shown in figure 5, isolation and filtering sub-circuit include the driver U19 of model SN6501-Q1, model
The voltage-stablizer U21 of the transformer T1 and model Tps76350 of We760390014.The 1st pin and transformer of driver U19
The 1st pin of T1 connects, the 2nd pin of driver U19 respectively with the 2nd pin of transformer T1, ground capacity C164 and connect
Ground capacitor C165 connection, and as the input terminal for being isolated and filtering sub-circuit, the 3rd pin of driver U19 is with transformer T1's
The connection of 3rd pin, the 4th pin of driver U19 and the 5th pin are grounded；The 4th pin of transformer T1 is with diode V10's
Anode connection, the 5th pin of transformer T1 respectively with one end of capacitor C166, one end of capacitor C167 and voltage-stablizer U21
2nd pin connect and ground, the 6th pin of transformer T1 are connect with the anode of diode V11, the cathode difference of diode V10
Connect with the 3rd pin of the cathode of diode V11, the other end of capacitor C166, the 1st pin of voltage-stablizer U21 and voltage-stablizer U21
It connects, the 5th pin of voltage-stablizer U21 is connect with the other end of capacitor C167, and as the output end for being isolated and filtering sub-circuit.
As shown in fig. 6, anti-interference sub-circuit includes resistance R81, R82, R83, R84, capacitor C124, C125, C16, C168
And inductance L17, L18, L19 and L20.One end of resistance R81 is the first input end of anti-interference sub-circuit, and the other end passes through
Inductance L17 is connect with one end of one end of capacitor C16 and inductance L19 respectively；One end of resistance R83 is anti-interference sub-circuit
Second input terminal, the other end are connect with one end of one end of capacitor C168 and inductance L20 respectively by inductance L18；Capacitor
One end of C124 is the first output end of anti-interference sub-circuit, the other end respectively with one end of resistance R82 and inductance L19
Other end connection；One end of capacitor C125 be anti-interference sub-circuit second output terminal, the other end respectively with resistance R84 one
The connection of the other end of end and inductance L20；The other end of capacitor C16, the other end of capacitor C168, resistance R82 the other end with
And the other end of resistance R84 is grounded.
Concrete operating principle and process of the invention are introduced below with reference to FIG. 1 to FIG. 6:
Be isolated sub-circuit input terminal access external dc power input voltage VI1, operating voltage range be 7V~
36V, after carrying out isolation filter processing to input voltage VI1 by isolation sub-circuit, output voltage VIN_O1 to the first pressure stabilizing
The input terminal of the input terminal of circuit and the second pressure stabilizing sub-circuit.First pressure stabilizing sub-circuit is by voltage-stablizer U16 to voltage VIN_
After O1 carries out steady pressure treatment, output voltage VO 1 is supplied to the main power pin of 77GHz automobile collision avoidance radar microcontroller.Second
After pressure stabilizing sub-circuit carries out steady pressure treatment to voltage VIN_O1 by voltage-stablizer U2, output voltage VI2 to isolation and filtering son electricity
The input terminal on road, as the input voltage for being isolated and filtering sub-circuit.Isolation and filtering sub-circuit pass through driver U19, transformation
After device T1 and voltage-stablizer U21 carries out isolation filter processing to voltage VI2, output voltage VO 2 is supplied to 77GHz automobile collision preventing thunder
Up to the digital communication power pin of microcontroller, relatively independent circuit is formed, prevents mutual crosstalk.
Anti-interference sub-circuit uses resistance, inductance and capacitor series-parallel system, to from 77GHz automobile collision avoidance radar radio frequency
The differential signal DIVN and DIVP of acquisition module are filtered, obtain the really necessary signal DIVN_AD of microcontroller with
DIVP_AD is supplied to the specific function pin of 77GHz automobile collision avoidance radar microcontroller.
All circuit devcies and circuit design in the embodiment of the present invention are realized according to electromagnetic compatibility consideration, are being applied
High degree improves that product is anti-interference and electromagnetic compatibility in the process.
Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such specific embodiments and embodiments.This field
Those of ordinary skill disclosed the technical disclosures can make according to the present invention and various not depart from the other each of essence of the invention
The specific variations and combinations of kind, these variations and combinations are still within the scope of the present invention.
Claims (6)
1. a kind of anti-jamming circuit of 77GHz automobile collision avoidance radar, which is characterized in that including isolation sub-circuit, the first pressure stabilizing
Circuit, the second pressure stabilizing sub-circuit, isolation and filtering sub-circuit and anti-interference sub-circuit；
The input voltage VI1 of the input terminal connection external dc power of the isolation sub-circuit, output end are steady with first respectively
Press the input terminal connection of the input terminal and the second pressure stabilizing sub-circuit of sub-circuit, the output end output of the first pressure stabilizing sub-circuit
Voltage VO1, and provide it to the main power pin of 77GHz automobile collision avoidance radar microcontroller；The second pressure stabilizing sub-circuit
Output end be isolated and filter sub-circuit input terminal connect, it is described isolation and filtering sub-circuit output end output voltage
VO2, and provide it to the digital communication power pin of 77GHz automobile collision avoidance radar microcontroller；The anti-interference sub-circuit
First input end input the differential signal DIVN from 77GHz automobile collision avoidance radar RF acquisition module, the second input terminal
Input differential signal DIVP, the first output end output signal DIVN_ from 77GHz automobile collision avoidance radar RF acquisition module
AD, second output terminal output signal DIVP_AD, signal DIVN_AD and DIVP_AD are both provided to 77GHz automobile collision avoidance radar
The function pin of microcontroller.
2. the anti-jamming circuit of 77GHz automobile collision avoidance radar according to claim 1, which is characterized in that the insulator
Circuit includes the fuse U12 of model 2920L150, and the 1st pin of the fuse U12 is connect with one end of capacitor C3, and
As the input terminal of isolation sub-circuit, the 2nd pin of the fuse U12 is connect with one end of inductance L1, the inductance L1's
The other end respectively with one end of capacitor C7, one end of capacitor C8, the cathode of diode V2, one end of capacitor C14 and inductance L12
One end connection；The other end of the inductance L12 is the output end that sub-circuit is isolated, the anode and diode of the diode V2
The anode connection of V3, the other end of the capacitor C14 are connect with one end of capacitor C15；The other end of the capacitor C3 respectively with
One end of the other end of capacitor C7, the other end of capacitor C8, the cathode of diode V3, the other end of capacitor C15 and inductance L13
Connect and ground, the other end ground connection of the inductance L13.
3. the anti-jamming circuit of 77GHz automobile collision avoidance radar according to claim 1, which is characterized in that described first is steady
Pressure sub-circuit includes the voltage-stablizer U16 of model Lp5912q3v3, and the 1st pin of the voltage-stablizer U16 is respectively with resistance R40's
One end of one end, one end of capacitor C139 and capacitor C140 connects, and the output end as the first pressure stabilizing sub-circuit, the electricity
The other end of resistance R40 is connect with the 3rd pin of voltage-stablizer U16, and the other end of the capacitor C139 and one end of capacitor C140 connect
It connects and is grounded；The 4th pin of the voltage-stablizer U16 respectively with the 6th pin of voltage-stablizer U16, one end of capacitor C136 and electricity
Hold one end connection of C137, and the input terminal as the first pressure stabilizing sub-circuit, the 5th pin of the voltage-stablizer U16 is respectively and surely
The 7th pin, the other end of capacitor C136 and the other end connect and ground of capacitor C137 of depressor U16.
4. the anti-jamming circuit of 77GHz automobile collision avoidance radar according to claim 1, which is characterized in that described second is steady
Pressure sub-circuit include model Tps74801 voltage-stablizer U2, the 5th pin of the voltage-stablizer U2 respectively with voltage-stablizer U2 the 6th
Pin, the 7th pin, the 8th pin, the 10th pin, the 11st pin, ground capacity C1 and ground capacity C2 connection, and as
The input terminal of two pressure stabilizing sub-circuits, the 15th pin of the voltage-stablizer U2 connect ground capacity C5, and the 12nd of the voltage-stablizer U2 the
Pin and the 21st pin are grounded；The 1st pin of the voltage-stablizer U2 respectively with the 18th pin of voltage-stablizer U2, the 19th pin,
20th pin, one end of resistance R1, one end of resistance R2, ground capacity C11 and ground capacity C12 connection, and as second
The output end of pressure stabilizing sub-circuit, the other end of the resistance R1 are connect with the 9th pin of voltage-stablizer U2, and the resistance R2's is another
End is connect with the 16th pin and ground resistance R3 of voltage-stablizer U2 respectively.
5. the anti-jamming circuit of 77GHz automobile collision avoidance radar according to claim 1, which is characterized in that it is described isolation and
Filtering sub-circuit includes the driver U19 of model SN6501-Q1, the transformer T1 of model We760390014 and model
For the voltage-stablizer U21 of Tps76350；
The 1st pin of the driver U19 is connect with the 1st pin of transformer T1, the 2nd pin difference of the driver U19
It is connect with the 2nd pin, ground capacity C164 and the ground capacity C165 of transformer T1, and as isolation and filters sub-circuit
3rd pin of input terminal, the driver U19 is connect with the 3rd pin of transformer T1, the 4th pin of the driver U19 and
5th pin is grounded；The 4th pin of the transformer T1 is connect with the anode of diode V10, and the 5th of the transformer T1 is drawn
Foot the 2nd pin connect and ground with one end of capacitor C166, one end of capacitor C167 and voltage-stablizer U21 respectively, the change
The 6th pin of depressor T1 is connect with the anode of diode V11, and the cathode of the diode V10 is negative with diode V11 respectively
The 3rd pin connection of pole, the other end of capacitor C166, the 1st pin of voltage-stablizer U21 and voltage-stablizer U21, the voltage-stablizer
The 5th pin of U21 is connect with the other end of capacitor C167, and as the output end for being isolated and filtering sub-circuit.
6. the anti-jamming circuit of 77GHz automobile collision avoidance radar according to claim 1, which is characterized in that described anti-interference
Sub-circuit includes resistance R81, R82, R83, R84, capacitor C124, C125, C16, C168 and inductance L17, L18, L19 and L20；
One end of the resistance R81 be anti-interference sub-circuit first input end, the other end by inductance L17 respectively with capacitor
One end of C16 and one end connection of inductance L19；One end of the resistance R83 is the second input terminal of anti-interference sub-circuit,
The other end is connect with one end of one end of capacitor C168 and inductance L20 respectively by inductance L18；One end of the capacitor C124
For the first output end of anti-interference sub-circuit, the other end connects with the other end of one end of resistance R82 and inductance L19 respectively
It connects；One end of the capacitor C125 be anti-interference sub-circuit second output terminal, the other end respectively with one end of resistance R84 with
And the other end connection of inductance L20；The other end of the capacitor C16, the other end of capacitor C168, resistance R82 the other end with
And the other end of resistance R84 is grounded.
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| CN201910089271.1A CN109782235B (en) | 2019-01-30 | 2019-01-30 | Anti-interference circuit of 77GHz automobile anti-collision radar |
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| CN201910089271.1A CN109782235B (en) | 2019-01-30 | 2019-01-30 | Anti-interference circuit of 77GHz automobile anti-collision radar |
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| CN109782235B CN109782235B (en) | 2023-09-05 |
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Citations (7)
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