CN107199988A - A kind of engine anti-theft locking circuit suitable for 12V and 24V systems - Google Patents
A kind of engine anti-theft locking circuit suitable for 12V and 24V systems Download PDFInfo
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- CN107199988A CN107199988A CN201710389604.3A CN201710389604A CN107199988A CN 107199988 A CN107199988 A CN 107199988A CN 201710389604 A CN201710389604 A CN 201710389604A CN 107199988 A CN107199988 A CN 107199988A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
- B60R25/01—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens
- B60R25/04—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the propulsion system, e.g. engine or drive motor
- B60R25/045—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the propulsion system, e.g. engine or drive motor by limiting or cutting the electrical supply to the propulsion unit
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Abstract
The invention discloses a kind of engine anti-theft locking circuit suitable for 12V and 24V systems.It includes the first protection circuit, electric source filter circuit, 12V mu balanced circuits, base station ic, bidirectional level conversion circuit and the second protection circuit, the first protection circuit output end connects the input of 12V mu balanced circuits, the input and output end of electric source filter circuit connection 12V mu balanced circuits, the output end connection base station ic and the power end of bidirectional level conversion circuit of the 12V mu balanced circuits, the LIN signal ends of the base station ic connect the LIN 12V signal ends of bidirectional level conversion circuit, the LIN 12V/24V signal ends connection vehicle LIN buses of the bidirectional level conversion circuit.The present invention utilizes existing base station ic, supply voltage and conversion LIN signal levels are reduced by 12V mu balanced circuits, bidirectional level conversion circuit and corresponding protection circuit, filter circuit, realize the anti-theft locking circuit for being capable of compatibility 12V and 24V systems, circuit structure is simple, superior performance, highly versatile.
Description
Technical field
The invention belongs to technical field of automobile electronic control, and in particular to a kind of engine suitable for 12V and 24V systems
Anti-theft locking circuit.
Background technology
Because automobile door lock has certain mutual opening rate, the anti-theft feature of automobile is reduced, therefore is developed and starts
Machine anti-theft locking system.Automobile for having been loaded with anti-theft locking system of engine, can open car door even if cartheft and also can not
Drive away.At present, anti-theft locking system of engine has been widely used in all kinds of automobiles, such as passenger car.
The operation principle of anti-theft locking system of engine：Built with Transponder (also referred to as responses in automotive ignition key
Device), each transponder has uniquely fixed ID (equivalent to identification number).When firing key inserts lock, transponder
Key ID is issued base station ic, ID is issued BCM (also referred to as car body controller) by base station ic by LIN, and whether is BCM identifications ID
Effectively.Engine can not be started if ID is invalid, if ID is effectively, when rotating firing key startup vehicle, BCM passes through base
Chip of standing sends random number and encryption data to transponder, the correctness of transponder computing and verification data, returns to the sound of encryption
Answer data to base station ic, response data is sent to BCM by base station ic, and BCM verifies the correctness of response data, if response
Data correctly allow for starting engine.If response data is incorrect with regard to No starting engine, base station ic and transponder
It is two-way authentication.
The solution party that base station ic in existing automobile engine locking circuit is proposed primarily directed to vehicle 12V systems
Case, solution also not for 24V systems, more the engine locking circuit without energy compatibility 12V and 24V systems, mainly
Reason is base station ic in the market only suitable for 12V systems, and they all cannot be directly used to 24V systems.
The content of the invention
The purpose of the present invention is exactly that the deficiency existed to solve above-mentioned background technology is applied to 12V and 24V there is provided one kind
The engine anti-theft locking circuit of system.
The technical solution adopted by the present invention is：A kind of engine anti-theft locking circuit suitable for 12V and 24V systems, bag
Include
First protection circuit, for protecting 12V mu balanced circuits；
Electric source filter circuit, for carrying out energy storage and filtering to 12V mu balanced circuits；
12V mu balanced circuits, for being the voltage for being available for base station ic to use by vehicle 12V or 24V voltage conversion；
Base station ic, for realizing engine anti-theft locking；
Bidirectional level conversion circuit, for carrying out electricity between LIN 12V signal levels and LIN 12V/24V signal levels
Flat bi-directional conversion and transmission；
Second protection circuit, for protecting bidirectional level conversion circuit；
The first protection circuit output end connects the input of 12V mu balanced circuits, electric source filter circuit connection 12V voltage stabilizings
The input and output end of circuit, the output end connection base station ic and bidirectional level conversion circuit of the 12V mu balanced circuits
Power end, the LIN signal ends of the base station ic connect the LIN 12V signal ends of bidirectional level conversion circuit, the two-way electricity
The LIN 12V/24V signal ends connection vehicle LIN buses of flat change-over circuit, the second protection circuit connection bidirectional level conversion circuit
LIN 12V signal ends and LIN 12V/24V signal ends.
Further, the 12V mu balanced circuits include voltage stabilizing chip U1, resistance R10 and resistance R9, the resistance R10 and
Resistance R9 connects, and the input of the voltage stabilizing chip U1 connects the output end of the first protection circuit, the electricity of the voltage stabilizing chip U1
The power end of monitoring side and output end connection base station ic and bidirectional level conversion circuit is pressed, the voltage of the voltage stabilizing chip U1 is anti-
Feedback end is connected between resistance R10 and resistance R9, and the resistance R10 other ends connect the power end of base station ic, the resistance R9 other ends
Ground connection.
Further, the bidirectional level conversion circuit includes metal-oxide-semiconductor Q1, resistance R7, resistance R8 and resistance R11, described
Resistance R7 and resistance R8 series connection, drain electrode connection resistance R11 one end of the metal-oxide-semiconductor Q1, resistance R11 other ends connection vehicle LIN
Bus, the grid of the metal-oxide-semiconductor Q1 is connected between resistance R7 and resistance R8, and the source electrode of the metal-oxide-semiconductor Q1 and resistance R7's is another
One end is all connected with the LIN signal ends of base station ic, and the resistance R8 other ends connect the output end of 12V mu balanced circuits.
Further, first protection circuit includes the power supply circuit for being used to carry out electrostatic protection and reversal connection protection
With the first EMC protection circuits for entering horizontal pulse protection, electromagnetic disturbance protection and electromagnetic immunity protection, the power supply electricity
Input connection vehicle 12V or the 24V power supply on road, the power supply circuit goes out input and connects the first EMC protection circuits
Input, the output end of the first EMC protection circuits electrically connects the input of 12V mu balanced circuits.
Further, the electric source filter circuit includes the first filter circuit and the second filter circuit, first filtering
The input of circuit on one side connection 12V mu balanced circuits, other end ground connection, one end connection 12V voltage stabilizings of second filter circuit
The output end of circuit, other end ground connection.
Further, second protection circuit includes the 2nd EMC protection circuits and the 3rd EMC protection circuits, described the
The LIN 12V/24V signal ends of two protection EMC circuit on one side connection bidirectional level conversion circuits, other end ground connection, the described 3rd
The LIN 12V signal ends of EMC protection circuits one end connection bidirectional level conversion circuit, other end ground connection.
Further, in addition to for the energy storage of receiver power supply and the receiver energy storage isolation circuit filtered and it is used for
The energy storage of low-frequency antenna power supply and the low-frequency antenna energy storage isolation circuit of filtering, one end of the receiver energy storage isolation circuit
Two VRC pins, the other ends for connecting base station ic respectively with one end of low-frequency antenna energy storage isolation circuit are grounded.
Further, in addition to low-frequency antenna, low-frequency antenna resonance block isolating circuit and low-frequency antenna signal receiving circuit, institute
State low-frequency antenna two ends and connect one end of low-frequency antenna resonance block isolating circuit and one end of low-frequency antenna signal receiving circuit respectively,
The other end of the low-frequency antenna resonance block isolating circuit connects the TX pins of base station ic, low-frequency antenna signal receiving circuit it is another
One end connects the RX pins and IOREF pins of base station ic.
Further, in addition to for producing the crystal oscillating circuit of accurate frequency, described crystal oscillating circuit one end connects base station
The XTAL pins of chip, other end ground connection.
The present invention utilizes existing base station ic, passes through 12V mu balanced circuits, bidirectional level conversion circuit and corresponding anti-
Protection circuit, filter circuit realize to reduce supply voltage and conversion LIN signal levels and are capable of the anti-of compatibility 12V and 24V systems
Locking circuit is stolen, circuit structure is simple, superior performance, highly versatile.Each circuit of the present invention is built by specific discrete device,
Cost of implementation is relatively low, and each device is low energy-consumption electronic device, and operation is low in energy consumption, and standby electrostatic current is also very low.
Brief description of the drawings
Fig. 1 is theory diagram of the invention.
Fig. 2 is the physical circuit figure in Tu1Zhong A areas.
Fig. 3 is the physical circuit figure in Tu1Zhong B areas.
Fig. 4 is the physical circuit figure in Tu1Zhong C areas.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, is easy to that this hair is well understood
It is bright, but they do not constitute restriction to the present invention.
As Figure 1-4, the present invention includes power supply circuit 1, the first EMC protection circuits 2, the first electric source filter circuit
3rd, 12V mu balanced circuits 4, second source filter circuit 5, the 2nd EMC protection circuits 6, bidirectional level conversion circuit 7, the 3rd EMC prevent
Protection circuit 8, receiver energy storage isolation circuit 9, low-frequency antenna energy storage isolation circuit 10, low-frequency antenna 13, low-frequency antenna resonance every
Straight circuit 12, low-frequency antenna signal receiving circuit 14, crystal oscillating circuit 11 and base station ic 15, wherein：
Input connection vehicle 12V or the 24V power supply of power supply circuit 1, the output end of the power supply circuit 1 connects
The input of the first EMC protection circuits 2 is connect, the output end of the first EMC protection circuits 2 electrically connects the defeated of 12V mu balanced circuits 4
Enter end；The input of the one end of first filter circuit 3 connection 12V mu balanced circuits 4, other end ground connection, second filter circuit 5
The output end of one end connection 12V mu balanced circuits 4, other end ground connection.
The output end connection base station ic 15 and the power end of bidirectional level conversion circuit 7 of 12V mu balanced circuits 4, the base
Stand chip 15 LIN signal ends (LIN_12V) connect bidirectional level conversion circuit 7 LIN 12V signal ends, the bidirectional level
The LIN 12V/24V signal ends connection vehicle LIN buses of change-over circuit 7.
The LIN 12V/24V signal ends of one end connection bidirectional level conversion circuit 7 of second protection EMC circuits 6, another termination
Ground, the LIN 12V signal ends of the one end of the 3rd EMC protection circuits 8 connection bidirectional level conversion circuit, other end ground connection.
One end of receiver energy storage isolation circuit 9 and one end of low-frequency antenna energy storage isolation circuit 10 connect base station core respectively
Two VRC pins, the other ends of piece 15 are grounded.
The two ends of low-frequency antenna 13 connect one end of low-frequency antenna resonance block isolating circuit 12 respectively and low-frequency antenna signal is received
One end of circuit 14, the other end of the low-frequency antenna resonance block isolating circuit 12 connects the TX pins of base station ic, low-frequency antenna
The other end of signal receiving circuit 14 connects the RX pins and IOREF pins of base station ic.
The XTAL pins of the one end of crystal oscillating circuit 11 connection base station ic, other end ground connection.
Power supply circuit 1, the effect protected with ESD (also referred to as static discharge) protection and reversal connection.Power supply circuit
Including resistance R4, ESD electric capacity C18 and diode D2, resistance R4 one end is connected to vehicle as the input of power supply circuit
12V or 24V power supplys, other end connection diode D2 anodes, diode D2 negative electrodes are connected as the output end of power supply circuit
To the input of the first EMC protection circuits 2, ESD electric capacity C18 one end is connected between resistance R4 and diode D2, another termination
Ground.Resistance R4 (10 ohm of resistance value, rated power 0.25W) plays a part of to limit input current, ESD electric capacity C18 (capacitances
10nF, rated insulation voltage 200V or 250V) play power filter and suppress electrostatic, diode D2 (rated current 1A, specified electricity
Pressure 1000V) serve it is anti-reverse.
First EMC protection circuits 2, the 2nd EMC protection circuits 6 and the 3rd EMC protection circuits 8 are respectively provided with pulse protection, electricity
The effect that magnetic harassing and wrecking protection and electromagnetic immunity are protected.
First EMC protection circuits 2 include electric capacity C38, TVS D3, inductance L6 and magnetic bead L5, and electric capacity C38 and TVS D3 are simultaneously
Connection, electric capacity C38 one end connection power supply circuit and inductance L6 one end, electric capacity C38 other ends ground connection；The inductance L6 other ends are connected
12V mu balanced circuit inputs.Electric capacity C38 (capacitance 100nF, amount is pressure-resistant 50V) plays power supply filter action, and TVS D3 are (also referred to as
Transient voltage suppresser diode, rated insulation voltage 36V, transient state suppresses power 600W) play a part of to suppress power supply disturbance signal, electricity
Sense L6 (inductance value 10uH, rated current 0.5A) acts to filter out power supply low frequency signal, magnetic bead L5 (centre frequency 100MHz,
Centre frequency impedance 220ohm, rated current 1A) play a part of to filter out power supply low frequency signal.
First electric source filter circuit 3 and second source filter circuit 5 are respectively provided with power supply energy storage and the effect of power filter；The
One electric source filter circuit 3 includes electric capacity C33 and electric capacity C27 in parallel, electric capacity C33 one end connection 12V mu balanced circuits input, another
One end is grounded.Electric capacity C33 (capacitance 47uF, rated insulation voltage 50V) plays energy storage and power supply low frequency filtering, electric capacity C27 (electricity
Capacitance 100nF, rated insulation voltage 50V) play power supply High frequency filter.
12V mu balanced circuits 4 are for being the voltage for being available for base station ic to use by vehicle 12V or 24V voltage conversion, with such as
Lower characteristic：Input voltage range -15V~48V, 11.75~12.25V of output voltage range, output current 150mA, electrostatic current is small
In 100uA, with Thermal protection and short-circuit protection, meet AEC standards.
12V mu balanced circuits include voltage stabilizing chip U1, resistance R10 and resistance R9, resistance R10 and resistance the R9 series connection, institute
State voltage stabilizing chip U1 input connect the first EMC protection circuits output end, the voltage monitoring end of the voltage stabilizing chip U1 and
Output end connects the power end of base station ic and bidirectional level conversion circuit, and the pressure feedback port of the voltage stabilizing chip U1 is connected to
Between resistance R10 and resistance R9, the resistance R10 other ends connect the power end of base station ic, resistance R9 other ends ground connection.
Voltage stabilizing chip U1 selects LDO (low pressure difference linear voltage regulator) chip of adjustable output voltage, voltage stabilizing chip U1 (types
Number NCV8502) play decompression and voltage stabilizing, voltage stabilizing chip U1 2 pin (MON) play monitoring output voltage, resistance R10
(resistance value 180k, rated power 0.1W) and resistance R9 (resistance value 20k, rated power 0.1W) play the work of output voltage sampling
With voltage stabilizing chip U1 7 pin (VADJ) play output voltage feedback.
Second source filter circuit 5 includes electric capacity C35, electric capacity C29 and electric capacity C31 in parallel, the connection of electric capacity C31 one end
12V circuit output end of pressure-stabilizing, other end ground connection.Electric capacity C35 (capacitance 22uF, rated insulation voltage 25V) plays energy storage and power supply low frequency
The effect of filtering, electric capacity C29 (capacitance 100nF, rated insulation voltage 50V) plays power supply intermediate frequency filtering, electric capacity C31 (electric capacity
Value 1nF, rated insulation voltage 50V) play power supply High frequency filter.
2nd EMC protection circuits 6 include TVS D5 and electric capacity C36 in parallel, electric capacity C36 one end connection two-way level converting
The LIN 12V/24V signal ends of circuit, other end ground connection.TVS D5 (rated insulation voltage 36V, transient state suppresses power 300W), which rise, to be suppressed
The effect of 12V or 24V LIN line interference signals, electric capacity C36 (capacitance 100pF, rated insulation voltage 50V) plays LIN line High frequency filters
Effect.
Bidirectional level conversion circuit, for carrying out electricity between LIN 12V signal levels and LIN 12V/24V signal levels
Flat bi-directional conversion and transmission；Switching rate is more than 20V/us, it is adaptable to which weak pull-up signal level is changed；Bidirectional level conversion circuit
Including metal-oxide-semiconductor Q1, resistance R7, resistance R8 and resistance R11, resistance R7 and resistance the R8 series connection, the drain electrode of the metal-oxide-semiconductor Q1 connects
Connecting resistance R11 one end, resistance R11 other ends connection vehicle LIN buses, the grid of the metal-oxide-semiconductor Q1 is connected to resistance R7 and electricity
Hinder between R8, the source electrode of the metal-oxide-semiconductor Q1 and the resistance R7 other end are all connected with the LIN signal ends of base station ic, resistance R8 is another
One end connects the output end of 12V mu balanced circuits.Resistance R11 (10 ohm of resistance value, rated power 0.25W) plays the work of limitation electric current
With metal-oxide-semiconductor Q1 plays level conversion, resistance R7 (resistance value 100k, rated power 0.1W) and resistance R8 (resistance values
300k, rated power 0.1W) play a part of to be adapted to Q1 GS voltages.
Bidirectional level conversion circuit realizes that the principle of level conversion is：What it is with the connection of its LIN 12V/24V signal end is whole
Exemplified by car LIN_24V, when LIN signals are transferred to LIN_12V from LIN_24V, if LIN_24V input high levels 24V, Q1 section
Only, LIN_12V exports high level 12V；If LIN_24V input low levels 0V, Q1 conducting, LIN_12V output low levels 0.7V.
When LIN signals are transferred to LIN_24V from LIN_12V, if LIN_12V input high levels 12V, Q1 cut-off, LIN_12V outputs
High level 24V；If LIN_12V input low levels 0V, Q1 conducting, LIN_12V output low levels 0V.There is mistake in logic
When, because LIN lines are to be connected to power supply just by weak pull-up resistor, also will not because of the equipment on overcurrent damage LIN networks and
Mosfet Q1。
3rd EMC protection circuits 8 include TVS D1 and electric capacity C30 in parallel, electric capacity C30 one end connection two-way level converting
The LIN 12V signal ends of circuit, other end ground connection.TVS D1 (rated insulation voltage 24V, transient state suppresses power 160W), which rise, suppresses 12V
The effect of LIN line interference signals, electric capacity C30 (capacitance 330pF, rated insulation voltage 50V) plays 12V LIN lines High frequency filters and suppression
The effect of 12V LIN voltage waveforms overshoot.
Receiver energy storage isolation circuit 9, the effect with the energy storage of receiver power supply and filtering.Receiver energy storage is isolated
Circuit includes electric capacity C12 (capacitance 100pF, rated insulation voltage 50V) and electric capacity C16 (capacitance 220nF, rated insulation voltage in parallel
50V), transient energy (in addition to reception antenna) is provided for base station ic U2, electric capacity C12 one end is connected to base station ic U2 VRC2
Pin, other end ground connection.
Low-frequency antenna energy storage isolation circuit 10, the effect with the energy storage of low-frequency antenna power supply and filtering.Low-frequency antenna
Energy storage isolation circuit include electric capacity C19 (capacitance 10uF, rated insulation voltage 10V) in parallel, electric capacity C21 (capacitance 10uF, it is specified
Pressure-resistant 10V), electric capacity C26 (capacitance 2.2uF, rated insulation voltage 10V), electric capacity C24 (capacitance 100nF, rated insulation voltage 50V) and
Electric capacity C25 (capacitance 100pF, rated insulation voltage 50V), is connected to base station ic U2 VRC1 pin, is base station ic U2 after parallel connection
Reception antenna is driven to provide transient energy.
Crystal oscillating circuit 11, with the effect for producing accurate frequency, it is desirable to which frequency error is less than 0.002%.Crystal oscillating circuit bag
Include crystal oscillator X1 (frequency 16MHz), electric capacity C28 (capacitance 10pF, rated insulation voltage 50V) and electric capacity C32 (capacitance 10pF, it is specified
Pressure-resistant 50V), crystal oscillator X1 is connected between base station ic U2 XATL1 pins and XATL2 pins, electric capacity C28 one end connection base station
Chip U2 XATL1 pins, other end ground connection, electric capacity C32 one end connection base station ic U2 XATL2 pins, other end ground connection,
C28 and C32 play the frequency and amplitude of stable oscillation stationary vibration waveform.
Low-frequency antenna resonance block isolating circuit 12, with the voltage waveform for producing voltage magnitude 100V and resonant frequency 125KHz
Effect, it is desirable to resonant capacitance is pressure-resistant 200V, capacitance is pressure-resistant 50V；Low-frequency antenna resonance isolation circuit include electric capacity C13,
Electric capacity C14, electric capacity C15, electric capacity C34, electric capacity C17, electric capacity C20 and resistance R6, wherein electric capacity C13, electric capacity C14, electric capacity C15 and
Electric capacity C34 is in parallel, and one end is connected with low-frequency antenna one end after parallel connection, the other end connects electric capacity C17 one end；The electric capacity C17 other ends
Connect base station ic U2 TX1 pins, electric capacity C20 and resistance R6 series connection, the resistance R6 other ends connection low-frequency antenna other end, electricity
Hold C20 other ends connection base station ic U2 TX2 pins.Electric capacity C17 (capacitance 100nF, rated insulation voltage 50V) and electric capacity C20
(capacitance 100nF, rated insulation voltage 50V) plays isolated DC, and resistance R6 (resistance value 18ohm, rated power 0.25W) rises
Limit the function of current, electric capacity C13 (capacitance 2.7nF, pressure voltage 200V or 250V), electric capacity C14 (capacitance 2.7nF, pressure voltage
200V or 250V), electric capacity C15 (capacitance 2.7nF, pressure voltage 200V or 250V) and electric capacity C34 (capacitance 330pF, pressure voltage
200V or 250V) play series resonance, resonant frequency is 125KHz.
Low-frequency antenna 13, the effect with the voltage waveform for producing voltage magnitude 100V and resonant frequency 125KHz, it is desirable to
Low-frequency antenna is pressure-resistant 200V, and be fixed on steering lock；
Low-frequency antenna is as shown in figure 4, low-frequency antenna (LF Antenna 365uH) is to be enclosed on motor turning to lock the line of induction
Circle, plays series resonance, resonant frequency is 125KHz, and can sense the coding information that reception firing key is sent.
Low-frequency antenna receiving circuit 14, the effect of message, matched load and ESD protection is transmitted with reception antenna.Low frequency
Antenna, which receives signal circuit, includes resistance R3 and electric capacity C23, resistance R3 one end connection low-frequency antenna, other end connection base station ic
U2 RX pins, electric capacity C23 one end connection base station ic U2 RX pins, other end connection base station ic U2 IOREF pins.
Resistance R3 (resistance value 100ohm, rated power 0.1W) plays the limitation function of current, and electric capacity C23 is actually the group of TVS and electric capacity
Close, its capacitance 12pF, breakdown voltage value is 18V, play antenna input signal filtering and suppress antenna pickup signal.
Base station ic U2 (BaseStation IC), has the property that：Fully integrated monolithic base station, it is high performance from
AF/AM (also referred to as frequency modulation/amplitude modulation) demodulation of sampling timing is adapted to, program-controlled modulation /demodulation can drive low-frequency antenna, can be with
Diagnostic antenna failure, can use the communication of LIN lines, run it is low in energy consumption and can be with dormancy etc..Base station ic U2 (models
PJF7992ATW/C1C) be automobile engine locking circuit master chip, it is the NXP advanced base station ic of the second generation, including
The circuits such as voltage-stablizer, microcontroller, house dog, low frequency transceiver, SPI interface and LIN interfaces, mainly play low frequency signal transmitting-receiving and make
With.
The present invention uses foregoing circuit, realizes the compatible engine anti-theft locking circuits of 12V and 24V, anti-theft locking electricity
The major function on road is transmitted in both directions low frequency signal.When for 24V systems, 12V mu balanced circuits export VDD_12V normal electricity
Pressure scope is 11.75~12.25V, when for 12V systems, and VDD_12V normal voltage range is 10.8~11.2V, and base
Chip U1 (model PJF7992ATW/C1C) the supply voltage claimed range of standing is 5.6~27V, therefore VDD_12V can meet
U1 power reguirements.When for 24V systems, LIN_24V normal voltage range is 16~32V, LIN_12V normal voltage
Scope is 11.75~12.25V, when for 12V systems, and LIN_24V normal voltage range is 9~16V, and LIN_12V is just
Normal voltage range is 8~15V, and the operating voltage range of base station ic U1LIN 12V circuits is 6~27V, outside LIN circuits
Operating voltage range be 6V~40V, therefore LIN_12V can meet the operating voltage requirement of U1LIN circuits, and LIN_24V can expire
The operating voltage requirement of the outside LIN circuits of foot, therefore circuit of the present invention can be used for 12V systems and 24V systems.
The foregoing is only a specific embodiment of the invention, it is noted that any those skilled in the art exist
Disclosed herein technical scope in, the change or replacement that can be readily occurred in, should all cover protection scope of the present invention it
It is interior.The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (9)
1. a kind of engine anti-theft locking circuit suitable for 12V and 24V systems, it is characterised in that：Including
First protection circuit, for protecting 12V mu balanced circuits；
Electric source filter circuit, for carrying out energy storage and filtering to 12V mu balanced circuits；
12V mu balanced circuits, for being the voltage for being available for base station ic to use by vehicle 12V or 24V voltage conversion；
Base station ic, for realizing engine anti-theft locking；
Bidirectional level conversion circuit, it is double for entering line level between LIN 12V signal levels and LIN 12V/24V signal levels
To conversion and transmission；
Second protection circuit, for protecting bidirectional level conversion circuit；
The first protection circuit output end connects the input of 12V mu balanced circuits, electric source filter circuit connection 12V mu balanced circuits
Input and output end, the 12V mu balanced circuits output end connection base station ic and bidirectional level conversion circuit power supply
End, the LIN signal ends of the base station ic connect the LIN 12V signal ends of bidirectional level conversion circuit, and the bidirectional level turns
The LIN 12V/24V signal ends connection vehicle LIN buses of circuit are changed, the second protection circuit connection bidirectional level conversion circuit
LIN 12V signal ends and LIN 12V/24V signal ends.
2. the engine anti-theft locking circuit according to claim 1 suitable for 12V and 24V systems, it is characterised in that：Institute
Stating 12V mu balanced circuits includes voltage stabilizing chip U1, resistance R10 and resistance R9, resistance R10 and resistance the R9 series connection, the voltage stabilizing
Chip U1 input connects the output end of the first protection circuit, the voltage monitoring end of the voltage stabilizing chip U1 and output end connection
The power end of base station ic and bidirectional level conversion circuit, the pressure feedback port of the voltage stabilizing chip U1 be connected to resistance R10 with
Between resistance R9, the resistance R10 other ends connect the power end of base station ic, resistance R9 other ends ground connection.
3. the engine anti-theft locking circuit according to claim 1 suitable for 12V and 24V systems, it is characterised in that：Institute
Stating bidirectional level conversion circuit includes metal-oxide-semiconductor Q1, resistance R7, resistance R8 and resistance R11, resistance R7 and resistance the R8 series connection,
Drain electrode connection resistance R11 one end of the metal-oxide-semiconductor Q1, resistance R11 other ends connection vehicle LIN buses, the grid of the metal-oxide-semiconductor Q1
Pole is connected between resistance R7 and resistance R8, and the source electrode of the metal-oxide-semiconductor Q1 and the resistance R7 other end are all connected with base station ic
LIN signal ends, the resistance R8 other ends connect the output end of 12V mu balanced circuits.
4. the engine anti-theft locking circuit according to claim 1 suitable for 12V and 24V systems, it is characterised in that：Institute
State the first protection circuit include be used for carry out electrostatic protection and reversal connection protection power supply circuit and be used for into horizontal pulse protection,
The first EMC protection circuits that electromagnetic disturbance is protected and electromagnetic immunity is protected, the input connection vehicle of the power supply circuit
12V or 24V power supplys, the power supply circuit goes out the input that input connects the first EMC protection circuits, the first EMC
The output end of protection circuit electrically connects the input of 12V mu balanced circuits.
5. the engine anti-theft locking circuit according to claim 1 suitable for 12V and 24V systems, it is characterised in that：Institute
Stating electric source filter circuit includes the first filter circuit and the second filter circuit, and described first filter circuit one end connects 12V voltage stabilizings
The input of circuit, other end ground connection, the output end of one end connection 12V mu balanced circuits of second filter circuit, the other end
Ground connection.
6. the engine anti-theft locking circuit according to claim 1 suitable for 12V and 24V systems, it is characterised in that：Institute
Stating the second protection circuit includes the 2nd EMC protection circuits and the 3rd EMC protection circuits, and the second protection EMC circuit on one side connects
Connect LIN 12V/24V signal ends, the other end ground connection of bidirectional level conversion circuit, the 3rd EMC protection circuits one end connection
The LIN 12V signal ends of bidirectional level conversion circuit, other end ground connection.
7. the engine anti-theft locking circuit according to claim 1 suitable for 12V and 24V systems, it is characterised in that：Also
Including the receiver energy storage isolation circuit for the energy storage of receiver power supply and filtering and for the storage of low-frequency antenna power supply
The low-frequency antenna energy storage isolation circuit that can and filter, one end of the receiver energy storage isolation circuit and low-frequency antenna energy storage isolation
Two VRC pins, the other ends that one end of circuit connects base station ic respectively are grounded.
8. the engine anti-theft locking circuit according to claim 1 suitable for 12V and 24V systems, it is characterised in that：Also
Including low-frequency antenna, low-frequency antenna resonance block isolating circuit and low-frequency antenna signal receiving circuit, the low-frequency antenna two ends difference
Connect low-frequency antenna resonance block isolating circuit one end and low-frequency antenna signal receiving circuit one end, the low-frequency antenna resonance every
The other end of straight circuit connects the TX pins of base station ic, the other end connection base station ic of low-frequency antenna signal receiving circuit
RX pins and IOREF pins.
9. the engine anti-theft locking circuit according to claim 1 suitable for 12V and 24V systems, it is characterised in that：Also
Including the crystal oscillating circuit for producing accurate frequency, described crystal oscillating circuit one end connects XTAL pins, the other end of base station ic
Ground connection.
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| CN107199988B CN107199988B (en) | 2019-05-17 |
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| CN109039352A (en) * | 2018-09-11 | 2018-12-18 | 西安航天自动化股份有限公司 | A kind of telemetering terminal power supply circuit |
| CN109177919A (en) * | 2018-09-29 | 2019-01-11 | 株式会社电装 | Vehicle anti-theft control system and vehicle anti-theft control method |
| CN115933853A (en) * | 2023-03-13 | 2023-04-07 | 电信科学技术第五研究所有限公司 | Storage circuit based on acquire electric energy through stealing electric mode on signal line |
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|---|---|
| CN107199988B (en) | 2019-05-17 |
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