CN117834336A - Voltage stabilizing circuit applied to LIN communication of commercial vehicle and control method thereof - Google Patents
Voltage stabilizing circuit applied to LIN communication of commercial vehicle and control method thereof Download PDFInfo
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Abstract
The application relates to the field of automobile communication systems, in particular to a voltage stabilizing circuit applied to LIN communication of a commercial vehicle and a control method thereof, wherein the voltage stabilizing circuit comprises a communication module, a control module and a control module, wherein the communication module is used for receiving interactive signals input by a user and outputting corresponding communication signals after converting the interactive signals so as to realize communication; the surge protection module is electrically connected between the communication module and the working voltage input end and is used for carrying out surge protection on the working voltage input to the communication module; the voltage stabilizing module is electrically connected between the output end of the surge protection module and the communication module so as to stabilize and protect the working voltage input to the communication module. The LIN chip protection circuit has the effects of stabilizing working voltage and protecting the LIN chip.
Description
Technical Field
The application relates to the field of automobile communication systems, in particular to a voltage stabilizing circuit applied to LIN communication of a commercial vehicle and a control method thereof.
Background
In the LIN communication circuit of a commercial vehicle, the operating voltage of the commercial vehicle is usually DC 18-32V, whereas the maximum operating voltage of most of the LIN chips on the market is DC 28V, so that the operating voltage of the commercial vehicle is too high for the LIN chips. The commercial vehicle has too high working voltage, and at the moment of flameout of the vehicle or closing of an inductive load, the voltage jumps higher, and irreversible damage is caused to components in a later-stage circuit. The LIN chip works under the limiting voltage which can be born by the LIN chip for a long time, so that the service life of the LIN chip is shortened seriously, and even the LIN chip breaks down and burns out, so that the service life of the LIN chip is shortened greatly.
Disclosure of Invention
In order to solve the problem that the service life of an LIN chip is shortened due to the fact that the working voltage of a commercial vehicle is too high, the application provides a voltage stabilizing circuit applied to LIN communication of the commercial vehicle and a control method of the voltage stabilizing circuit.
The application provides a voltage stabilizing circuit for commercial car LIN communication adopts following technical scheme:
a voltage regulator circuit for use in a commercial vehicle LIN communication, comprising:
the communication module receives the interactive signals input by the user, converts the interactive signals and outputs corresponding communication signals to realize communication;
the surge protection module is electrically connected between the communication module and the working voltage input end and is used for carrying out surge protection on the working voltage input to the communication module;
the voltage stabilizing module is electrically connected between the output end of the surge protection module and the communication module so as to stabilize and protect the working voltage input to the communication module.
Through adopting above-mentioned technical scheme, carry out the surge through surge protection module to the operating voltage of input and absorb, carry out steady voltage step-down to operating voltage through voltage stabilizing module to the operating voltage who finally inputs for communication module controls, makes it keep in communication module's maximum voltage, reduces communication module work and leads to impaired probability under extreme voltage, extension communication module's life.
Optionally, the voltage stabilizing module includes triode Q1, triode Q2, resistance R9 and zener diode ZD3, triode Q1 with triode Q2's collector connects parallelly connected electricity is in on surge protection module's the output, triode Q2's projecting pole electricity is connected on triode Q1's base, triode Q1's projecting pole with communication module's input electricity is connected, zener diode ZD3 negative pole electricity is connected on triode Q2's base, resistance R9 is established ties between triode Q2's collector and base, zener diode ZD3 positive pole ground connection.
By adopting the technical scheme, when the working voltage does not exceed the breakdown voltage of the zener diode ZD3, the zener diode ZD3 is disconnected and does not work, and the current directly reaches the communication module through the diode D1 and the triode Q1; when the working voltage exceeds the breakdown voltage of the zener diode ZD3, the zener diode ZD3 breaks down and conducts to enter the working state and has current to pass through, so that the triode Q2 controls the triode Q1 to enter the amplifying state to generate voltage drop, the voltage entering the communication module cannot exceed the breakdown voltage of the zener diode ZD3, the voltage stabilizing effect is achieved, the communication module is protected to work in the effective voltage range all the time, the working life of the communication module is greatly prolonged, and the reliability is improved.
Optionally, the surge protection module includes a protection diode ZD1, a capacitor CE3, and a capacitor C2, where the protection diode ZD1, an anode of the capacitor CE3, and the capacitor C2 are connected in parallel to the working voltage input end, and the protection diode ZD1, a cathode of the capacitor CE3, and the capacitor C2 are connected in parallel to the ground end.
Through adopting above-mentioned technical scheme, carry out surge absorption through protection diode ZD1, carry out the wave filtering through electric capacity C2, carry out the wave filtering and energy storage through electric capacity CE3 to release when voltage is undulant downwards, make the power that exports for voltage stabilizing module more stable.
Optionally, the communication module includes a chip U2, the VS pin of the chip U2 is electrically connected to the output end of the voltage stabilizing module, the LIN pin of the chip U2 is electrically connected to the LIN end to implement communication, and the LIN pin of the chip U2 is connected to the VS pin in parallel, the VCC pin of the chip U2 is electrically connected to the power supply end, and the TXD pin and the RXD pin of the chip U2 are electrically connected to the monolithic computer to implement man-machine interaction.
Through adopting above-mentioned technical scheme, realize the interaction of data through chip U2, play the guard action to chip U2 through surge protection module and voltage stabilizing module simultaneously, prolong chip U2's life, when solving the operating voltage of commercial car too big and instantaneous voltage too big, lead to the problem of chip U2 damage.
Optionally, the surge protection module includes a voltage stabilizing tube D1, the communication module includes a diode D2, an anode of the diode D1 is electrically connected to the working voltage input end, a cathode of the diode D1 is electrically connected to the input end of the voltage stabilizing module, an anode of the diode D2 is electrically connected to the VS pin of the chip U2, and a cathode of the diode D2 is electrically connected to the LIN pin of the chip U2.
Through adopting above-mentioned technical scheme, realize preventing reverse connection through stabilizator D1 and stabilizator D2, further play the guard action to chip U2, reduce the probability that the careless reverse connection of user leads to chip U2 or other components and parts or circuit damage.
Optionally, the method further comprises:
the detection module is electrically connected to the voltage stabilizing module to detect the voltages of the positive electrode and the negative electrode of the voltage stabilizing diode ZD3, detect the voltages of the emitting electrode and the base electrode of the triode Q1 and output corresponding detection signals to a user;
and the control module receives the detection signal, the output end is electrically connected to the base of the triode Q1, and the output voltage of the output end is controlled according to the detection signal.
By adopting the technical scheme, the voltage stabilizing module is detected through the detection module, and when the working voltage output to the chip U2 is abnormal, the position of the voltage stabilizing module is judged to be damaged, and the damaged position is output to a user so as to achieve the aim of reminding; then, the voltage of the base electrode of the triode Q1 is emergently regulated through the control module, so that the pressure on the chip U2 is reduced, and a protection effect is achieved.
The application provides a voltage stabilizing circuit for commercial car LIN communication adopts following technical scheme:
a control method, comprising:
obtaining a maximum voltage value;
inputting working voltage, carrying out surge absorption and filtering on the working voltage, and judging whether the working voltage is larger than a maximum voltage value or not;
if the working voltage is smaller than the maximum voltage value, filtering the working voltage again, and outputting the working voltage to the chip U2;
if the working voltage is greater than the maximum voltage value, a voltage drop is generated, so that the working voltage is reduced to the maximum voltage value, and then the working voltage is output to the chip U2.
Through adopting above-mentioned technical scheme, when operating voltage is in the extreme voltage scope of chip U2, directly export for chip U2 use, when operating voltage exceeds the extreme voltage scope of chip U2, export for chip U2 use after stepping down operating voltage, reduced the probability that chip U2 work led to the damage on the extreme voltage, played the guard action, prolonged life.
Optionally, the method comprises the following steps:
detecting the positive electrode and the negative electrode of the zener diode ZD3 to obtain regulated input voltage data, regulated output voltage data and regulated current data, determining an actual maximum voltage value according to the regulated input voltage data, the regulated output voltage data and the regulated current data, determining whether the zener diode ZD3 is in a normal working state according to the maximum voltage value and the actual maximum voltage value, and outputting a corresponding alarm signal to a user;
detecting an emitter and a base of the triode Q1 to obtain output voltage data before amplification and output voltage data after amplification, determining an actual amplification coefficient through the output voltage data before amplification and the output voltage data after amplification, determining whether the triode Q1 is in a normal working state through the actual amplification coefficient, and outputting a corresponding alarm signal to a user.
Through adopting above-mentioned technical scheme, remind the user through different alarm signal for the user can discover the components and parts that have problems more soon, improves maintenance efficiency, and makes the user maintain as soon as possible, reduces the damage to communication module.
Optionally, after obtaining the amplified output voltage data, the method further includes:
comparing and judging whether the working voltage output to the communication module is in a normal working state or not according to the amplified output voltage data and the maximum voltage value, and outputting a corresponding detection signal;
if the detection signal indicates that the working voltage output to the communication module is not in a normal working state, the base voltage of the triode Q1 is adjusted according to the amplified output voltage so as to adjust the amplified output voltage to be within the range of the maximum voltage value.
Through adopting above-mentioned technical scheme, adjust the operating voltage who gives communication module, play urgent relief's effect, further reduce the probability that voltage stabilizing module suddenly damages and leads to the fact too high voltage to cause the damage to communication module.
Optionally, after obtaining the regulated input voltage data, the regulated output voltage data, the regulated current data, the output voltage data before amplification and the output voltage data after amplification, the method further includes:
if the amplified output voltage data and the actual maximum voltage value are abnormal and the actual amplification coefficient is normal, determining a theoretical output voltage threshold value through the actual maximum voltage value, the actual amplification coefficient and a preset triode Q2 amplification coefficient, and if the amplified output voltage data are within the theoretical output voltage threshold value, outputting an alarm signal representing damage of a zener diode ZD3 to a user; and if the amplified output voltage data is outside the theoretical output voltage threshold, outputting an alarm signal representing that the triode Q2 is damaged to a user.
By adopting the technical scheme, the accuracy of the alarm signal is improved, so that a user can know what component is faulty more accurately.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the problems of overlarge direct-current voltage and insufficient current capacity of the voltage stabilizing chip can be solved.
2. The probability of damage caused by the operation of the communication module under the limit voltage is reduced, and the service life of the communication module is prolonged.
Drawings
Fig. 1 is a schematic block diagram of a voltage stabilizing circuit applied to LIN communication of a commercial vehicle in embodiment 1 of the present application.
Fig. 2 is a schematic circuit diagram of a surge protection module and a voltage regulator module.
Fig. 3 is a circuit schematic of the communication module.
Fig. 4 is a schematic flow chart of a control method in embodiment 1 of the present application.
Fig. 5 is a schematic block diagram of a voltage stabilizing circuit applied to LIN communication of a commercial vehicle in embodiment 2 of the present application.
FIG. 6 is a schematic circuit diagram showing the detection module and the control module.
Fig. 7 is a flow chart of a control method in embodiment 2 of the present application.
Reference numerals illustrate: 1. a communication module; 11. a surge protection module; 12. a voltage stabilizing module; 13. a detection module; 14. and a control module.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-7.
Embodiment 1 of the application discloses a voltage stabilizing circuit applied to LIN communication of a commercial vehicle. Referring to fig. 1, the voltage stabilizing circuit applied to the LIN communication of the commercial vehicle comprises a communication module 1, a surge protection module 11 and a voltage stabilizing module 12, wherein the communication module 1 is used for realizing man-machine interaction with a user, converting received data or signals into communication signals and outputting the communication signals, the surge protection module 11 is used for absorbing working voltage input to the communication module 1 by the commercial vehicle and then outputting the working voltage to the voltage stabilizing module 12, and the voltage stabilizing module 12 is used for stabilizing the input working voltage and then outputting the working voltage to the communication module 1 for supplying power.
Referring to fig. 2, the surge protection module 11 includes a diode D1, a protection diode ZD1, a capacitor C2, a capacitor C5, and a capacitor CE3, where in this embodiment, the protection diode ZD1 may use a TVS tube for absorbing a surge, the capacitor C2 and the capacitor C5 may use patch ceramic chip capacitors for filtering, and the capacitor CE3 may use electrolytic capacitors for filtering and storing energy. The input end of the working voltage input by the commercial vehicle is BAT, the anode of the diode D1 is connected in series with the BAT, and the cathode output of the diode D1 is used as the output end of the surge protection module 11. One end of the protection diode ZD1 is connected in parallel between the BAT and the positive electrode of the diode D1, and the other end of the protection diode ZD1 is grounded. One end of the capacitor C2 is connected in parallel to the cathode of the diode D1, the other end of the capacitor C2 is electrically connected to one end of the capacitor C5, and the other end of the capacitor C5 is grounded. The positive electrode of the capacitor CE3 is connected in parallel to the negative electrode of the diode D1, and the negative electrode of the capacitor CE3 is grounded.
Referring to fig. 2 and 3, the voltage stabilizing module 12 includes a +24v power supply terminal, a triode Q1, a triode Q2, a resistor R9, a voltage stabilizing diode ZD3 and a capacitor C7, wherein in this embodiment, the resistor R9 is 100kΩ/0603, the capacitor C7 is 100nF/0603/100V, the voltage stabilizing diode ZD3 is a 27V voltage stabilizing tube, and the capacitor C7 is SMF4750A. The collector of the triode Q1 is electrically connected to the cathode of the diode D1 serving as the output end of the surge protection module 11, the capacitor C2 and the capacitor CE3 are connected in parallel between the collector of the triode Q1 and the cathode of the diode D1, and the emitter of the triode Q1 is output as the output end of the voltage stabilizing module 12. The +24V power supply end is connected in parallel with the collector electrode of the triode Q1, the collector electrode of the triode Q2 is connected in parallel with the collector electrode of the triode Q1, and the emitter electrode of the triode Q2 is electrically connected with the base electrode of the triode Q1. The negative electrode of the zener diode ZD3 is electrically connected to the base electrode of the triode Q2, and the positive electrode of the zener diode ZD3 is grounded. The resistor R9 is connected in parallel between the cathode of the zener diode ZD3 and the collector of the triode Q2, one end of the capacitor C7 is connected in parallel between the resistor R9 and the cathode of the zener diode ZD3, and the other end of the capacitor C7 is connected in parallel with the anode of the zener diode ZD 3.
Referring to fig. 2 and 3, the communication module 1 includes a chip U2, a capacitor CE1, a capacitor C4, a diode D2, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R10, a diode ZD2, a capacitor C6, a capacitor C3, a capacitor CE2, and LIN pins. In the implementation, the chip U2 can be an SBC chip, and the communication functions of LDO and LIN are integrated; the diode ZD2 adopts an ESD tube for electrostatic absorption; the capacitor C3, the capacitor 4 and the capacitor C6 can adopt patch ceramic chip capacitors for filtering; the resistor R2, the resistor R4, the resistor R5, the resistor R6, the resistor R7 and the resistor R10 can adopt chip resistors for current limiting; the resistor R8 can adopt magnetic beads for high-frequency filtering; the capacitors CE1 and CE2 can be electrolytic capacitors for filtering and storing energy. The first pin of the chip U2 is a VS pin, and the VS pin is electrically connected to the emitter of the transistor Q1 as the output terminal of the voltage stabilizing module 12. The positive pole of the capacitor CE1 is connected in parallel with the VS pin of the chip U2, one end of the capacitor C4 is connected in parallel with the VS pin of the chip U2, and the other end of the capacitor C4 is grounded with the negative pole of the capacitor CE 1. The fourth pin of the chip U2 is a LIN pin, the LIN pin is electrically connected to the LIN pin of the chip U2, and the resistor R8 is connected in series between the LIN pin and the LIN pin of the chip U2. The positive pole of diode D2 connects in parallel on the VS pin of chip U2, and the one end of resistance R10 is connected on diode D2's negative pole electricity, and the other end of resistance R10 connects in parallel between the LIN pin of chip U2 and resistance R8. The first pin and the second pin of the diode ZD2 are connected in parallel between the resistor R8 and the LIN pin, the third pin of the diode ZD2 is grounded, one end of the capacitor C6 is connected in parallel between the resistor R8 and the LIN pin, and the other end of the capacitor C6 is grounded. The second pin of the chip U2 is an EN pin, one end of the resistor R5 is electrically connected to the EN pin of the chip U2, and the other end of the resistor R5 is electrically connected to the LIN EN end. The third pin of the chip U2 is grounded as the GND pin. The fifth pin of the chip U2 is an RXD pin, the sixth pin of the chip U2 is a TXD pin, the RXD pin and the TXD pin of the chip U2 are electrically connected to the singlechip to realize data interaction, the TXD pin of the chip U2 is used for data transmission, the RXD pin is used for data reception, and the data is converted through the chip U2 and then is communicated with the outside through the LIN pin. One end of the resistor R2 is connected in parallel between the RXD pin of the chip U2 and the resistor R7, and the other end of the resistor R2 is electrically connected with a +5V power supply end. The resistor R7 is connected in series between the RXD pin of the chip U2 and the singlechip, the resistor R6 is connected in series between the TXD pin of the chip U2 and the singlechip, the seventh pin of the chip U2 is used as an NRES pin, the resistor R4 is electrically connected to the MCLR end, and the resistor R4 is connected in series between the NRES pin of the chip U2 and the MCLR end. The eighth pin of the chip U2 is a VCC pin, the positive electrode of the capacitor CE2 is connected in parallel with the VCC pin of the chip U2, one end of the capacitor C3 is connected in parallel with the VCC pin of the chip U2, the other end of the capacitor C3 and the negative electrode of the capacitor CE2 are grounded together, the VCC pin of the chip U2 is also connected with a +5V power supply end in parallel, and the +5V power supply end is connected between the capacitor C3 and the positive electrode of the capacitor CE2 in parallel.
The implementation principle of the voltage stabilizing circuit applied to the LIN communication of the commercial vehicle is as follows: when the working voltage input by the BAT does not exceed 27V, the voltage stabilizing diode ZD3 is not broken down and conducted, and the input voltage is directly connected to a VS pin of the chip U2 through the diode D1 and the triode Q1. When the working voltage input by the BAT is greater than 27V, the zener diode ZD3 breaks down and conducts to enter the working state and has current to pass through, so that the triode Q2 controls the triode Q1 to enter the amplifying state, voltage drop is generated, and the voltage entering the VS pin of the chip U2 is smaller than or equal to 27V.
Embodiment 1 of the present application discloses a control method. Referring to fig. 4, the control method includes:
s1, obtaining a maximum voltage value;
s11, inputting working voltage, carrying out surge absorption and filtering on the working voltage, and judging whether the working voltage is larger than a maximum voltage value or not;
s12, if the working voltage is smaller than the maximum voltage value, filtering the working voltage again, and outputting the working voltage to the chip U2;
and S13, if the working voltage is greater than the maximum voltage value, generating a voltage drop to enable the working voltage to be reduced to the maximum voltage value, and outputting the voltage to the chip U2.
Examples: the maximum voltage value is the breakdown voltage of the zener diode ZD3, when the input working voltage is smaller than or equal to the breakdown voltage of the zener diode ZD3, the zener diode ZD3 is disconnected, the current is filtered by the capacitor C2 and the capacitor C5, the diode ZD1 absorbs the surge, the capacitor CE3 directly reaches the VS pin of the chip U2 through the triode Q1 after being filtered, and then the filtered current is output through the VCC end of the chip U2; when the input working voltage is greater than the breakdown voltage of the zener diode ZD3, the zener diode ZD3 breaks down and conducts, current is filtered by the capacitor C2 and the capacitor C5, the diode ZD1 absorbs surge, after the capacitor CE3 filters, the voltage is amplified by the triode Q2 and the triode Q1, after voltage drop is generated, the voltage is reduced to be less than or equal to the breakdown voltage of the zener diode ZD3, the voltage reaches the VS pin of the chip U2, and then the voltage is output through the VCC end of the chip U2.
Example 2:
embodiment 2 of the present application discloses a voltage stabilizing circuit applied to LIN communication of a commercial vehicle, and unlike embodiment 1, referring to fig. 5 and 6, the voltage stabilizing circuit further comprises a detection module 13 and a control module 14, wherein the detection module 13 is electrically connected to the anode and the cathode of the zener diode ZD3 and the emitter and the base of the triode Q1, so as to detect the voltages of the anode and the cathode of the zener diode ZD3, detect the voltages of the emitter and the base of the triode Q1, and output corresponding detection signals to a user. The control module 14 is configured to receive a detection signal, where the control module 14 is electrically connected to the base of the transistor Q1, and if the detection signal indicates that the voltage of the emitter of the transistor Q1 is greater than 27V, the base of the transistor Q1 is divided to reduce the voltage of the emitter, and if the detection signal indicates that the voltage of the emitter of the transistor Q1 is too small, the voltage is output to the base of the transistor Q1 to pull up the voltage of the emitter of the transistor Q1.
Embodiment 2 of the present application discloses a control method, referring to fig. 5, 6 and 7, including:
s2, detecting the positive electrode and the negative electrode of the zener diode ZD3 to obtain voltage-stabilizing input voltage data, voltage-stabilizing output voltage data and voltage-stabilizing current data, determining an actual maximum voltage value according to the voltage-stabilizing input voltage data, the voltage-stabilizing output voltage data and the voltage-stabilizing current data, determining whether the zener diode ZD3 is in a normal working state according to the maximum voltage value and the actual maximum voltage value, and outputting a corresponding alarm signal to a user;
s21, detecting an emitter and a base of the triode Q1 to obtain output voltage data before amplification and output voltage data after amplification, determining an actual amplification factor according to the output voltage data before amplification and the output voltage data after amplification, determining whether the triode Q1 is in a normal working state according to the actual amplification factor, and outputting a corresponding alarm signal to a user;
s22, comparing and judging whether the working voltage output to the communication module 1 is in a normal working state or not through the amplified output voltage data and the maximum voltage value, and outputting a corresponding detection signal; if the detection signal indicates that the working voltage output to the communication module 1 is not in the normal working state, the base voltage of the triode Q1 is adjusted according to the amplified output voltage, so as to adjust the amplified output voltage to be within the range of the maximum voltage value.
Examples: if the detected voltage stabilizing input voltage data is 25V, but the detected voltage stabilizing current data is detected, the voltage stabilizing diode ZD3 is turned on when the voltage drop is only 25V, the actual maximum voltage value is smaller than the maximum voltage value, and an alarm signal indicating that the voltage stabilizing diode ZD3 is damaged is output to a user; setting the output voltage data before amplification to be 13V, outputting the output voltage after amplification to be 20V, wherein the amplification factor of the triode Q1 is 2,13 x 2>20, and the actual amplification factor is 20/13=1.5, 1.5<2, so that an alarm signal indicating the damage of the triode Q1 is output to a user; if the amplified output voltage data is 26V,26V <27V, a detection signal representing normal operation is output, if the amplified output voltage data is 30V,30V >27V, a detection signal with overlarge working voltage is output, at this time, the voltage dividing circuit is connected and conducted to the base of the triode Q1 through the control module 14 or the voltage of the base of the triode Q1 is adjusted by adjusting the resistor and the like electrically connected to the base of the triode Q1 through the control module 14, and the amplified output voltage data is returned to be smaller than 27V.
Referring to fig. 6 and 7, step S21 further includes step S3:
s3, if the amplified output voltage data and the actual maximum voltage value are abnormal and the actual amplification coefficient is normal, determining a theoretical output voltage threshold value through the actual maximum voltage value, the actual amplification coefficient and a preset triode Q2 amplification coefficient, and if the amplified output voltage data is within the theoretical output voltage threshold value, outputting an alarm signal representing damage of the zener diode ZD3 to a user; and if the amplified output voltage data is outside the theoretical output voltage threshold, outputting an alarm signal representing that the triode Q2 is damaged to a user.
Examples: setting the amplified output voltage data to be 30V, the actual maximum voltage value to be 30V, and the output voltage data to be 15V before amplification to obtain the actual amplification factor of the triode Q1 to be 2, wherein the actual amplification factor is the same as the theoretical amplification factor of the triode Q1, which indicates that the triode Q1 is not damaged, calculating the theoretical output voltage of the emitter of the triode Q1 when the triode Q1 and the triode Q2 work normally through the theoretical amplification factor of the triode Q2, the actual maximum voltage value and calculating to obtain the theoretical output voltage threshold, and outputting an alarm signal indicating that the zener diode ZD3 is damaged to a user if the calculated theoretical output voltage threshold is matched with the amplified output voltage, and outputting an alarm signal indicating that the triode Q1 is damaged to the user; if the theoretical output voltage threshold value is not matched with the amplified output voltage, an alarm signal indicating that the triode Q2 is damaged is output to a user, and an alarm signal indicating that the zener diode ZD3 is damaged is not output, and an alarm signal indicating that the triode Q1 is damaged is not output.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (10)
1. A voltage regulator circuit for a commercial vehicle LIN communication, comprising:
the communication module (1) receives the interactive signals input by the user, converts the interactive signals and outputs corresponding communication signals to realize communication;
the surge protection module (11) is electrically connected between the communication module (1) and the working voltage input end and is used for carrying out surge protection on the working voltage input to the communication module (1);
the voltage stabilizing module (12) is electrically connected between the output end of the surge protection module (11) and the communication module (1) so as to stabilize and protect the working voltage input to the communication module (1).
2. A voltage stabilizing circuit for use in commercial vehicle LIN communications according to claim 1, wherein: the voltage stabilizing module (12) comprises a triode Q1, a triode Q2, a resistor R9 and a voltage stabilizing diode ZD3, wherein the triode Q1 and a collector of the triode Q2 are electrically connected in parallel with the output end of the surge protecting module (11), an emitter of the triode Q2 is electrically connected with a base of the triode Q1, an emitter of the triode Q1 is electrically connected with an input end of the communication module (1), a cathode of the voltage stabilizing diode ZD3 is electrically connected with the base of the triode Q2, the resistor R9 is connected in series between the collector and the base of the triode Q2, and an anode of the voltage stabilizing diode ZD3 is grounded.
3. A voltage stabilizing circuit for use in commercial vehicle LIN communications according to claim 1, wherein: the surge protection module (11) comprises a protection diode ZD1, a capacitor CE3 and a capacitor C2, wherein the protection diode ZD1, the positive electrode of the capacitor CE3 and the capacitor C2 are connected in parallel to the working voltage input end, and the protection diode ZD1, the negative electrode of the capacitor CE3 and the capacitor C2 are connected in parallel to the grounding end.
4. A voltage stabilizing circuit for use in commercial vehicle LIN communications according to claim 1, wherein: the communication module (1) comprises a chip U2, a VS pin of the chip U2 is electrically connected to the output end of the voltage stabilizing module (12), a LIN pin of the chip U2 is electrically connected to the LIN end to realize communication, the LIN pin of the chip U2 is connected to the VS pin in parallel, a VCC pin of the chip U2 is electrically connected to the power supply end, and a TXD pin and a RXD pin of the chip U2 are electrically connected to the singlechip to realize man-machine interaction.
5. The voltage stabilizing circuit for commercial vehicle LIN communication according to claim 4, wherein: the surge protection module (11) comprises a voltage stabilizing tube D1, the communication module (1) comprises a diode D2, the anode of the diode D1 is electrically connected to the working voltage input end, the cathode of the diode D1 is electrically connected to the input end of the voltage stabilizing module (12), the anode of the diode D2 is electrically connected to the VS pin of the chip U2, and the cathode of the diode D2 is electrically connected to the LIN pin of the chip U2.
6. A voltage stabilizing circuit for use in commercial vehicle LIN communications according to claim 2, further comprising:
the detection module (13) is electrically connected to the voltage stabilizing module (12) to detect the voltages of the positive electrode and the negative electrode of the voltage stabilizing diode ZD3, detect the voltages of the emitter electrode and the base electrode of the triode Q1 and output corresponding detection signals to a user;
and the control module (14) receives the detection signal, the output end is electrically connected to the base of the triode Q1, and the output voltage of the output end is controlled according to the detection signal.
7. A control method using a voltage stabilizing circuit according to claim 6 for use in a commercial vehicle LIN communication, comprising:
obtaining a maximum voltage value;
inputting working voltage, carrying out surge absorption and filtering on the working voltage, and judging whether the working voltage is larger than a maximum voltage value or not;
if the working voltage is smaller than the maximum voltage value, filtering the working voltage again, and outputting the working voltage to the chip U2;
if the working voltage is greater than the maximum voltage value, a voltage drop is generated, so that the working voltage is reduced to the maximum voltage value, and then the working voltage is output to the chip U2.
8. A control method according to claim 7, comprising:
detecting the positive electrode and the negative electrode of the zener diode ZD3 to obtain regulated input voltage data, regulated output voltage data and regulated current data, determining an actual maximum voltage value according to the regulated input voltage data, the regulated output voltage data and the regulated current data, determining whether the zener diode ZD3 is in a normal working state according to the maximum voltage value and the actual maximum voltage value, and outputting a corresponding alarm signal to a user;
detecting an emitter and a base of the triode Q1 to obtain output voltage data before amplification and output voltage data after amplification, determining an actual amplification coefficient through the output voltage data before amplification and the output voltage data after amplification, determining whether the triode Q1 is in a normal working state through the actual amplification coefficient, and outputting a corresponding alarm signal to a user.
9. The control method according to claim 8, characterized by further comprising, after obtaining the amplified output voltage data:
comparing and judging whether the working voltage output to the communication module (1) is in a normal working state or not through the amplified output voltage data and the maximum voltage value, and outputting a corresponding detection signal;
if the detection signal indicates that the working voltage output to the communication module (1) is not in a normal working state, the base voltage of the triode Q1 is adjusted according to the amplified output voltage so as to adjust the amplified output voltage to be within the range of the maximum voltage value.
10. The control method according to claim 9, wherein after obtaining the regulated input voltage data, the regulated output voltage data, the regulated current data, the pre-amplification output voltage data, and the post-amplification output voltage data, further comprising:
if the amplified output voltage data and the actual maximum voltage value are abnormal and the actual amplification coefficient is normal, determining a theoretical output voltage threshold value through the actual maximum voltage value, the actual amplification coefficient and a preset triode Q2 amplification coefficient, and if the amplified output voltage data are within the theoretical output voltage threshold value, outputting an alarm signal representing damage of a zener diode ZD3 to a user; and if the amplified output voltage data is outside the theoretical output voltage threshold, outputting an alarm signal representing that the triode Q2 is damaged to a user.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311862081.1A CN117834336A (en) | 2023-12-29 | 2023-12-29 | Voltage stabilizing circuit applied to LIN communication of commercial vehicle and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311862081.1A CN117834336A (en) | 2023-12-29 | 2023-12-29 | Voltage stabilizing circuit applied to LIN communication of commercial vehicle and control method thereof |
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| CN117834336A true CN117834336A (en) | 2024-04-05 |
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| CN202311862081.1A Pending CN117834336A (en) | 2023-12-29 | 2023-12-29 | Voltage stabilizing circuit applied to LIN communication of commercial vehicle and control method thereof |
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