CN114802056A - Automobile limp mode control circuit - Google Patents

Automobile limp mode control circuit Download PDF

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Publication number
CN114802056A
CN114802056A CN202210613917.3A CN202210613917A CN114802056A CN 114802056 A CN114802056 A CN 114802056A CN 202210613917 A CN202210613917 A CN 202210613917A CN 114802056 A CN114802056 A CN 114802056A
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CN
China
Prior art keywords
electrically connected
switch module
voltage
transistor
terminal
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Pending
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CN202210613917.3A
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Chinese (zh)
Inventor
王涛
王忠模
赵品勇
詹乐
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Beijing Maichuangzhiheng New Energy Technology Co ltd
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Beijing Maichuangzhiheng New Energy Technology Co ltd
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Priority to CN202210613917.3A priority Critical patent/CN114802056A/en
Publication of CN114802056A publication Critical patent/CN114802056A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
    • B60R16/0231—Circuits relating to the driving or the functioning of the vehicle

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Electronic Switches (AREA)

Abstract

The invention discloses an automobile limp mode control circuit which comprises a first switch module, a second switch module, a third switch module, a one-way conduction module and a voltage division circuit, wherein the first switch module is connected with the second switch module; the output end of the voltage division circuit is electrically connected with the control end of the first switch module; the first end of the first switch module is electrically connected with the first voltage end, and the second end of the first switch module is respectively electrically connected with the control end of the second switch module and the control end of the third switch module; the first end of the second switch module is electrically connected with the control end of the first switch module, and the second end of the second switch module is electrically connected with the second voltage end; the first end of the third switch module is used as the output end of the automobile limp home mode control circuit, and the second end of the third switch module is electrically connected with the second voltage end. When the automobile breaks down, the fault output end of the automobile outputs a fault signal, so that the first switch module, the second switch module and the third switch module are conducted, and a limp mode is triggered. The circuit structure is simple, and the automobile cost is reduced.

Description

Automobile limp mode control circuit
Technical Field
The invention relates to an automobile control circuit, in particular to an automobile limp-home mode control circuit.
Background
At present, most functions of the automobile are controlled by an automobile body controller, the development trend of the automobile body controller technology is modularization and integration, and the functions related to most controllers are closely related to driving safety. Therefore, when the controller cannot work normally, a safe working mode without the control of the controller is needed to ensure that the user can stop safely, and the working mode is called a Limp Home (Limp Home).
The existing limp mode control circuit of some automobiles still adopts some chip elements for design, so that the cost is higher.
Disclosure of Invention
The invention provides a limp-home mode control circuit of an automobile, which is used for outputting a trigger signal to trigger a limp-home mode when a controller of the automobile fails, and is simple in circuit.
According to an aspect of the present invention, there is provided a limp home mode control circuit for an automobile, including: the circuit comprises a first switch module, a second switch module, a third switch module, a one-way conduction module and a voltage division circuit;
the first end of the voltage division circuit is electrically connected with a first voltage end, the output end of the voltage division circuit is electrically connected with the control end of the first switch module, the second end of the voltage division circuit is electrically connected with the first end of the one-way conduction module, and the second end of the one-way conduction module is electrically connected with the fault output end of the automobile;
a first end of the first switch module is electrically connected with the first voltage end, and a second end of the first switch module is respectively electrically connected with a control end of the second switch module and a control end of the third switch module; the first end of the second switch module is electrically connected with the control end of the first switch module, and the second end of the second switch module is electrically connected with the second voltage end; a first end of the third switching module is used as an output end of the automobile limp home mode control circuit, and a second end of the third switching module is electrically connected with the second voltage end;
the voltage division circuit is configured to generate a conducting signal when a fault output end of the automobile outputs a fault signal, and the first switch control module is configured to control the second switch module and the third switch module to be conducted according to the conducting signal after the conducting signal is conducted, so that the output end of the automobile limp home mode control circuit outputs a trigger signal.
Optionally, the first switch module includes a first triode, a base of the first triode is electrically connected to an output terminal of the voltage dividing circuit, an emitter of the first triode is electrically connected to the first voltage terminal, and a collector of the first triode is electrically connected to control terminals of the second switch module and the third switch module, respectively.
Optionally, the first triode is a PNP triode.
Optionally, the second switch module includes a second triode, a base of the second triode is electrically connected to the second end of the first switch module, a collector of the second triode is electrically connected to the control end of the first switch module, and an emitter of the second triode is electrically connected to the second voltage end.
Optionally, the second triode is an NPN-type triode.
Optionally, the third switching module includes a first transistor, a gate of the first transistor is electrically connected to the second terminal of the first switching module, a first pole of the first transistor is used as an output terminal of the vehicle limp-home mode control circuit, and a second pole of the first transistor is electrically connected to the second voltage terminal.
Optionally, the first transistor is an N-type MOS transistor.
Optionally, the voltage dividing circuit includes a first resistor and a second resistor, a first end of the first resistor is electrically connected to the first voltage terminal, a second end of the first resistor is electrically connected to a first end of the second resistor, a second end of the second resistor is electrically connected to a first end of the unidirectional conducting module, and a second end of the first resistor is electrically connected to a control terminal of the first switch module.
Optionally, the control circuit for the limp home mode of the automobile further comprises a first capacitor, a first end of the first capacitor is electrically connected with the first voltage end, and a second end of the first capacitor is electrically connected with the output end of the voltage dividing circuit.
Optionally, the control circuit for the limp home mode of the automobile further includes a second capacitor, one end of the second capacitor is electrically connected to the control end of the third switch module, and a second end of the second capacitor is electrically connected to the second voltage end.
The embodiment of the invention provides an automobile limp mode control circuit, which comprises a first switch module, a second switch module, a third switch module, a one-way conduction module and a voltage division circuit, wherein the first switch module is connected with the second switch module; the first end of the voltage division circuit is electrically connected with the first voltage end, the output end of the voltage division circuit is electrically connected with the control end of the first switch module, the second end of the voltage division circuit is electrically connected with the first end of the one-way conduction module, and the second end of the one-way conduction module is electrically connected with the fault output end of the automobile; the first end of the first switch module is electrically connected with the first voltage end, and the second end of the first switch module is respectively electrically connected with the control end of the second switch module and the control end of the third switch module; the first end of the second switch module is electrically connected with the control end of the first switch module, and the second end of the second switch module is electrically connected with the second voltage end; the first end of the third switch module is used as the output end of the automobile limp home mode control circuit, and the second end of the third switch module is electrically connected with the second voltage end. In this embodiment, when the automobile has a fault, the fault output end outputs a fault signal, so that the voltage at the output end of the voltage dividing circuit triggers the first switch module to be turned on, the second switch module and the third switch module are triggered to be turned on after the first switch module is turned on, and the first end of the third switch module outputs the voltage at the second voltage end after the third switch module is turned on, so as to trigger the limp mode of the automobile. The circuit structure is simple in the embodiment, the triggering of the limp home mode can be realized through the simple circuit, and the cost of the automobile is reduced.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a limp home mode control circuit of an automobile according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another limp home mode control circuit of an automobile according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of another limp home mode control circuit of an automobile according to an embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a limp home mode control circuit of an automobile according to an embodiment of the present invention, and referring to fig. 1, the limp home mode control circuit includes a first switching module 10, a second switching module 11, a third switching module 12, a unidirectional conducting module 13, and a voltage dividing circuit 14;
a first end of the voltage dividing circuit 14 is electrically connected with a first voltage end VC, an output end of the voltage dividing circuit 14 is electrically connected with a control end G1 of the first switch module 10, a second end of the voltage dividing circuit 14 is electrically connected with a first end of the unidirectional conducting module 13, and a second end of the unidirectional conducting module 13 is electrically connected with a fault output end I0 of the automobile;
the first end a1 of the first switch module 10 is electrically connected to the first voltage terminal VC, and the second end a2 of the first switch module 10 is electrically connected to the control terminal G2 of the second switch module 11 and the control terminal G3 of the third switch module 12, respectively; the first terminal A3 of the second switch module 11 is electrically connected to the control terminal G1 of the first switch module 10, and the second terminal a4 of the second switch module 11 is electrically connected to the second voltage terminal VE; the first terminal a5 of the third switch module 12 serves as the output terminal U0 of the limp home mode control circuit, and the second terminal a6 of the third switch module 12 is electrically connected to the second voltage terminal VE;
the voltage dividing circuit 14 is configured to generate a turn-on signal when the fault output terminal I0 of the vehicle outputs a fault signal, and the first switch control module 10 is configured to control the second switch module 11 and the third switch module 12 to be turned on according to the turn-on signal after the turn-on signal is turned on, so that the output terminal U0 of the vehicle limp home mode control circuit outputs a trigger signal.
Optionally, the limp home mode control circuit further includes a pull-up resistor R0, one end of the pull-up resistor R0 is electrically connected to the first voltage terminal VC, and the other end of the pull-up resistor R0 is electrically connected to the output terminal U0 of the limp home mode control circuit.
In the embodiment, the first voltage terminal VC is exemplarily shown to be at a high level, such as a voltage of 5V, and the second voltage terminal VE may be at a low level, such as a ground potential. The fault output terminal I0 of the vehicle may be an output port of a controller on the vehicle, such as an MCU, and the fault output terminal I0 of the vehicle may output a high level when the MCU of the vehicle is working normally, and the fault output terminal I0 of the vehicle may output a low level when the vehicle is out of order, such as an overvoltage, an overcurrent, or other equipment faults. The unidirectional conducting module 13 has the function of unidirectional conducting, current can only flow from its first end to its second end, optionally the unidirectional conducting module 13 comprises a first diode D1, for example a diode of the type IN 4007. The first switch module 10 may be a transistor, and the first switch module 10 is configured to connect the first terminal a1 and the second terminal a2 in response to the voltage of the control terminal G1. The second switch module 10 may be a transistor, and the second switch module 11 is configured to connect the first terminal A3 and the second terminal a4 in response to the voltage of the control terminal G2. The third switching module 12 may be a transistor, and the third switching module 12 is configured to connect the first terminal a5 and the second terminal a6 in response to the voltage of the control terminal G3. The trigger signal may be a voltage of the second voltage terminal VE, and the conducting signal is a voltage output by the output terminal of the voltage divider circuit 14 when the first voltage terminal VC, the voltage divider circuit 14 and the fault output terminal I0 of the vehicle form a path.
The operation process of the limp home mode control circuit of the automobile of the embodiment is as follows: when the automobile does not have a fault in normal operation, the fault output end I0 of the automobile outputs a high level, the voltage output by the output end of the voltage dividing circuit 14 is 0, the first switch module 10, the second switch module 11 and the third switch module 12 are not conductive, and the output end U0 of the automobile limp-home mode control circuit outputs a high level through the pull-up action of the pull-up resistor R0, so that the limp-home mode is not triggered. When the automobile breaks down, the fault output end I0 of the automobile outputs a fault signal, i.e. a low level, the first voltage end VC, the voltage dividing circuit 14 and the fault output end I0 of the automobile form a passage, the output end of the voltage dividing circuit 14 outputs a voltage, i.e. a conducting signal, to trigger the first switch module 10 to be conducted, and after the first switch module 10 is conducted, the second switch module 11 and the third switch module 12 are controlled to be conducted, so that the output end U0 of the automobile limp-home mode control circuit outputs a potential, i.e. a low level, of the second voltage end VE to trigger the limp-home mode.
The circuit of the embodiment intersects with the limp mode trigger function integrated in the chip in the prior art, the circuit is simple in structure, the limp mode can be triggered through the simple circuit, and the cost of an automobile is reduced.
With reference to fig. 1, optionally, the voltage divider circuit 14 includes a first resistor R1 and a second resistor R2, a first end of the first resistor R1 is electrically connected to the first voltage terminal VC, a second end of the first resistor R1 is electrically connected to a first end of the second resistor R2, a second end of the second resistor R2 is electrically connected to a first end of the unidirectional conducting module 13, and a second end of the first resistor R1 is further electrically connected to the control terminal G1 of the first switch module 10.
The first resistor R1 and the second resistor R2 form a voltage divider 14, and when the fault output terminal I0 of the vehicle outputs a fault signal, the voltage of the first voltage terminal VC is divided, and then the divided voltage is output to the first switch module 10 through the second terminal of the first resistor R1.
On the basis of the foregoing embodiments, referring to fig. 2, in a schematic structural diagram of another limp home mode control circuit of an automobile according to an embodiment of the present invention, referring to fig. 2, optionally, the first switching module 10 includes a first transistor Q1, a base of the first transistor Q1 is electrically connected to an output terminal of the voltage dividing circuit 14, an emitter of the first transistor Q1 is electrically connected to the first voltage terminal VC, and a collector of the first transistor Q1 is electrically connected to control terminals of the second switching module 11 and the third switching module 12, respectively.
The first switch module 10 is a triode, which has low price and can further reduce the cost of the circuit. The base of the first transistor Q1 serves as the control terminal G1 of the first switch module 10, the emitter of the first transistor Q1 serves as the first terminal a1 of the first switch module 10, and the collector of the first transistor Q1 serves as the second terminal a2 of the first switch module 10.
Optionally, the first transistor Q1 is a PNP transistor. Illustratively, the first switch R1 has a resistance of 200K Ω, the second resistor R2 has a resistance of 4.7K Ω, and the first voltage terminal VC has a voltage of 5V. When the fault output terminal I0 of the automobile outputs a fault signal, the voltage output by the output terminal of the voltage division circuit 14 is 0.11V.
When the fault output terminal I0 of the automobile outputs the fault signal, the voltage output by the output terminal of the voltage dividing circuit 14 is 0.11V, the voltage of the emitter of the first triode Q1 is 5V, the voltage difference between the emitter and the base of the first triode Q1 is greater than the threshold voltage of the first triode Q1 (the threshold voltage of the first triode Q1 is generally 0.7V), and the first triode Q1 is turned on.
Based on the above embodiments, with reference to fig. 2, optionally, the second switching module 11 includes a second transistor Q2, a base of the second transistor Q2 is electrically connected to the second terminal a2 of the first switching module 10, a collector of the second transistor Q2 is electrically connected to the control terminal G1 of the first switching module 10, and an emitter of the second transistor Q2 is electrically connected to the second voltage terminal VE.
The second switch module 11 is a triode, which has low price and can further reduce the cost of the circuit. The base of the second transistor Q2 serves as the control terminal G2 of the second switch module 11, the emitter of the second transistor Q2 serves as the second terminal a4 of the second switch module 11, and the collector of the second transistor Q2 serves as the first terminal A3 of the second switch module 11.
Optionally, the second transistor Q2 is an NPN transistor. After the first switching module 10 is turned on, a voltage difference between the base and the emitter of the second transistor Q2 is greater than a threshold voltage of the second transistor Q2, and the second transistor Q2 is turned on. Optionally, the limp home mode control circuit of the vehicle further includes a first current-limiting resistor R3, the first current-limiting resistor R3 is connected between the emitter of the second transistor Q2 and the second voltage terminal VE, and the resistance of the first current-limiting resistor R3 may be 4.7K Ω, so as to prevent the device from being damaged due to excessive current flowing through the first switch module 10 and the second transistor Q2 after the first switch module 10 and the second transistor Q2 are turned on.
With continued reference to fig. 2, optionally, the third switching module 12 includes a first transistor Q3, a gate of the first transistor Q3 is electrically connected to the second terminal a2 of the first switching module 10, a first pole of the first transistor Q3 is used as the output terminal U0 of the vehicle limp-home mode control circuit, and a second pole of the first transistor Q3 is electrically connected to the second voltage terminal.
The first transistor Q3 is a MOS transistor, the MOS transistor is simple in process and low in power consumption, and the power consumption of the circuit can be reduced when the transistor is applied to the circuit. The gate of the first transistor Q3 is used as the control terminal G3 of the third switching module 12, the first pole of the first transistor Q3 is used as the first terminal a5 of the third switching module 12, and the second pole of the first transistor Q3 is used as the second terminal a6 of the third switching module 12.
Optionally, the first transistor Q3 is an N-type MOS transistor. The source of the first transistor Q3 is used as the second terminal a6 of the third switching module 12, and the drain of the first transistor Q3 is used as the first terminal a5 of the third switching module 12. After the first switching module 10 is turned on, the gate voltage of the first transistor Q3 is at a high level, so that the first transistor Q3 is turned on, after the first transistor Q3 is turned on, the output terminal U0 of the vehicle limp-home mode control circuit is connected to the second voltage terminal VE, and the output terminal U0 of the vehicle limp-home mode control circuit outputs a low level, thereby triggering the limp-home mode. Optionally, the vehicle limp-home mode control circuit further includes a second current limiting resistor R4, the second current limiting resistor R4 is connected between the control terminal G2 of the second switch module 11 and the control terminal G3 of the third switch module 12, and the resistance of the second current limiting resistor R4 may be 100 Ω, so as to prevent the device from being damaged due to excessive current flowing into the third switch module 12 after the first switch module 10 is turned on.
In the circuit in the prior art, if an overvoltage fault occurs to the automobile for a short time, the output end of the automobile limp-home mode control circuit outputs a trigger signal for a short time, and if the overvoltage fault disappears, the trigger signal (namely, a signal triggering the limp-home mode) output by the output end of the automobile limp-home mode control circuit disappears, at this time, because the time for the trigger signal to appear is short, a user may ignore the trigger signal, and the automobile has hidden danger. In this embodiment, the first switch module 10 includes a first triode Q1, the second switch module 11 includes a second triode Q2, as long as a fault signal is output from the fault output terminal I0 of the vehicle once, a path is always formed between the first voltage terminal VC, the first triode Q1, the second triode Q2 and the first voltage terminal VE, so that the first triode Q1, the second triode Q2 and the first transistor Q3 are always turned on, even if the fault signal output from the fault output terminal I0 of the vehicle disappears, the output terminal U0 of the limp mode control circuit of the vehicle always outputs a low level until the vehicle is powered up again, that is, the first voltage terminal VC is powered up again, so that a user can easily find that the vehicle has an over-fault and needs to perform maintenance, and avoid the situation that the vehicle has a problem and is not found.
Referring to fig. 3, the limp home mode control circuit of the vehicle according to the embodiment of the present invention is shown in fig. 3, and optionally, the limp home mode control circuit further includes a first capacitor C1, a first terminal of the first capacitor C1 is electrically connected to the first voltage terminal VC, and a second terminal of the first capacitor C1 is electrically connected to the output terminal of the voltage divider 14.
The capacitance value of the first capacitor C1 may be 1uF, and when the vehicle is initially powered on, since the voltage of the first capacitor C1 cannot suddenly change, the voltage of the first capacitor C1 is 0, at this time, no matter whether the signal output by the fault output terminal I0 of the vehicle is a high level or a low level, the first switch module 10, the second switch module 11, and the third switch module 12 are all turned off, so as to ensure the stability of the circuit.
When the automobile normally works, the fault output end of the automobile outputs high level, the voltage of the first capacitor C1 is discharged to be 0V through the first resistor R1, and therefore the situation that the voltage of the first capacitor C1 is not 0 when the automobile is powered on next time, and the first triode Q1 is conducted mistakenly is avoided. It should be noted that the voltage of the first capacitor C1 is the voltage difference between the emitter and the base of the first transistor Q1.
With continued reference to fig. 3, optionally, the vehicle limp home mode control circuit further includes a second capacitor C2, one end of the second capacitor C2 is electrically connected to the control terminal G3 of the third switching module 12, and a second end of the second capacitor C2 is electrically connected to the second voltage terminal VE.
The capacitance value of the second capacitor C2 is 1nF, and the second capacitor C2 plays a role in filtering, so that clutter signals in the circuit can be filtered, and the stability of the circuit is ensured.
With continued reference to fig. 3, optionally, a second diode D2 may also be connected between the first voltage terminal VC and the first terminal a1 of the first switch module 10. An anode of the second diode D2 is electrically connected to the first voltage terminal VC, and a cathode of the second diode D2 is electrically connected to the first terminal a1 of the first switch module 10.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An automotive limp home mode control circuit, comprising: the circuit comprises a first switch module, a second switch module, a third switch module, a one-way conduction module and a voltage division circuit;
the first end of the voltage division circuit is electrically connected with a first voltage end, the output end of the voltage division circuit is electrically connected with the control end of the first switch module, the second end of the voltage division circuit is electrically connected with the first end of the unidirectional conduction module, and the second end of the unidirectional conduction module is electrically connected with the fault output end of the automobile;
a first end of the first switch module is electrically connected with the first voltage end, and a second end of the first switch module is respectively electrically connected with a control end of the second switch module and a control end of the third switch module; the first end of the second switch module is electrically connected with the control end of the first switch module, and the second end of the second switch module is electrically connected with the second voltage end; a first end of the third switching module is used as an output end of the automobile limp home mode control circuit, and a second end of the third switching module is electrically connected with the second voltage end;
the voltage division circuit is configured to generate a conducting signal when a fault output end of the automobile outputs a fault signal, and the first switch control module is configured to control the second switch module and the third switch module to be conducted according to the conducting signal after the conducting signal is conducted, so that the output end of the automobile limp home mode control circuit outputs a trigger signal.
2. The limp home mode control circuit of claim 1, wherein the first switching module comprises a first transistor, a base of the first transistor is electrically connected to the output of the voltage divider circuit, an emitter of the first transistor is electrically connected to the first voltage terminal, and a collector of the first transistor is electrically connected to the control terminals of the second and third switching modules, respectively.
3. The automotive limp home mode control circuit of claim 2, wherein the first transistor is a PNP transistor.
4. The limp home mode control circuit of claim 1, wherein the second switching module comprises a second transistor, a base of the second transistor being electrically connected to the second terminal of the first switching module, a collector of the second transistor being electrically connected to the control terminal of the first switching module, and an emitter of the second transistor being electrically connected to the second voltage terminal.
5. The automotive limp home mode control circuit of claim 4, wherein the second transistor is an NPN transistor.
6. The vehicle limp home mode control circuit of claim 1, wherein the third switching module comprises a first transistor having a gate electrically connected to the second terminal of the first switching module, a first pole of the first transistor being an output of the vehicle limp home mode control circuit, and a second pole of the first transistor being electrically connected to the second voltage terminal.
7. The automotive limp home mode control circuit of claim 6, wherein the first transistor is an N-type MOS transistor.
8. The limp home mode control circuit of claim 1, wherein the voltage divider circuit comprises a first resistor and a second resistor, a first end of the first resistor is electrically connected to the first voltage terminal, a second end of the first resistor is electrically connected to a first end of the second resistor, a second end of the second resistor is electrically connected to a first end of the unidirectional conducting module, and a second end of the first resistor is further electrically connected to the control terminal of the first switching module.
9. The automotive limp home mode control circuit of claim 1, further comprising a first capacitor having a first terminal electrically connected to the first voltage terminal and a second terminal electrically connected to the output of the voltage divider circuit.
10. The automotive limp home mode control circuit of claim 1, further comprising a second capacitor having one terminal electrically connected to the control terminal of the third switching module and a second terminal electrically connected to the second voltage terminal.
CN202210613917.3A 2022-05-31 2022-05-31 Automobile limp mode control circuit Pending CN114802056A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210613917.3A CN114802056A (en) 2022-05-31 2022-05-31 Automobile limp mode control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210613917.3A CN114802056A (en) 2022-05-31 2022-05-31 Automobile limp mode control circuit

Publications (1)

Publication Number Publication Date
CN114802056A true CN114802056A (en) 2022-07-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210613917.3A Pending CN114802056A (en) 2022-05-31 2022-05-31 Automobile limp mode control circuit

Country Status (1)

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CN (1) CN114802056A (en)

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