CN117728819A - Signal transmission circuit and vehicle - Google Patents

Abstract

The invention discloses a signal transmission circuit and a vehicle, wherein the signal transmission circuit comprises: the first power supply is connected with the output end of the first controller and the first end of the level conversion module and is used for providing a first voltage of a first high-level signal to the level conversion module when the output end of the first controller outputs the first high-level signal; the second end of the level conversion module is connected to the input end of the second controller and is used for converting the first voltage of the first high-level signal into the first low-level signal or converting the second voltage of the second low-level signal into the second high-level signal and then inputting the second high-level signal into the input end of the second controller. The level conversion module converts the high-level signal and the low-level signal which are input from the outside, so that the high-level signal and the low-level signal which are input into the second controller are ensured to be safe and stable, and the second controller identification signal is prevented from being in error or damaged due to external fluctuation.

Description

Signal transmission circuit and vehicle

Technical Field

The application relates to the technical field of vehicle control, in particular to a signal transmission circuit and a vehicle.

Background

Vehicle circuits typically include a plurality of different controllers that often require signal interaction via high and low level signals. However, because the environment in the vehicle is complex and changeable, and the harness connection between the controllers is often long, in order to avoid interference of the interaction signals between the controllers, the high-level voltage used for transmitting signals between the controllers is often set to be large, and because the voltage which can be actually received by the signal receiving pins of the controllers is smaller than the high-level voltage, before the high-level voltage is transmitted to the controllers, the high-level voltage needs to be converted into a voltage range which can be received by the controllers. However, the voltage after conversion in the actual vehicle circuit is often unstable and will change along with the change of the high-level voltage before conversion, so that the controller receiving the signal cannot accurately identify the level of the signal, and even the changed level signal may damage the controller.

Disclosure of Invention

In view of the above, the present invention provides a signal transmission circuit and a vehicle.

In a first aspect, an embodiment of the present application provides a signal transmission circuit, where the signal transmission circuit includes a first power supply connected to an output terminal of a first controller and a first terminal of a level conversion module, and configured to provide a first voltage of a first high level signal to the level conversion module when the output terminal of the first controller outputs the first high level signal, and provide a second voltage of a second low level signal to the level conversion module when the output terminal of the first controller outputs the second low level signal; the first end of the level conversion module is connected to the first power supply and the output end of the first controller, the second end of the level conversion module is connected to the input end of the second controller, and the level conversion module is used for converting the first voltage of the first high-level signal into a first low-level signal or converting the second voltage of the second low-level signal into a second high-level signal and then inputting the second high-level signal into the input end of the second controller.

In one possible implementation, the circuit further includes a second power supply connected to a third terminal of the level shift module; the level conversion module is used for controlling the input end of the second controller to be grounded when the first end receives the first voltage of the first high-level signal so as to input the first low-level signal to the input end of the second controller; the level conversion module is further configured to control, when the first end receives a second voltage of the second low-level signal, the input end of the second controller to be communicated with the output end of the second power supply, so as to input the second high-level signal to the input end of the second controller.

In one possible implementation manner, the level conversion module includes a triode, a first resistor and a second resistor, wherein a collector of the triode is connected to an input end of a second controller and to the ground as the second end, an emitter of the triode is connected to a second power supply and one end of the first resistor as the third end, a base of the triode is connected to the other end of the first resistor and one end of the second resistor, and the other end of the second resistor is connected to the first power supply and the output end of the first controller as the first end; the triode is used for communicating a passage between the emitter and the collector under the condition that the output end of the first controller outputs a second low-level signal so as to enable the output end of the second power supply to be communicated with the passage between the input end of the second controller; the triode is also used for disconnecting a passage between the emitter and the collector under the condition that the output end of the first controller outputs the first high-level signal so as to enable the input end of the second controller to be grounded; the first resistor and the second resistor are used for adjusting the first current flowing through the base electrode of the triode so as to enable the triode to be in a normal working state.

In a possible implementation manner, the circuit further comprises a third resistor, one end of the third resistor is connected to the second end of the level conversion module and the input end of the second controller, and the other end of the third resistor is grounded; the third resistor is used for grounding the input end of the second controller when the first end of the level conversion module receives the first high-level signal, so that the input end of the second controller receives the first low-level signal.

In one possible implementation manner, the circuit further comprises a first diode, wherein the positive electrode of the first diode is connected to the first end of the level conversion module, and the negative electrode of the first diode is connected to the first power supply and the output end of the first controller; the first diode is used for preventing abnormal voltage from being input into the second power supply.

In a possible implementation manner, the circuit further comprises a second diode, wherein the positive electrode of the second diode is connected to the first power supply, and the negative electrode of the second diode is connected to the output end of the first controller; the second diode is used for preventing abnormal voltage from being input to the first power supply.

In one possible implementation manner, the circuit further comprises a first capacitor, one end of the first capacitor is connected to the first power supply and the output end of the first controller, and the other end of the first capacitor is grounded; the first capacitor is used for filtering the transient mutation signal output by the first controller.

In a possible implementation manner, the circuit further comprises a fourth resistor, one end of the fourth resistor is connected to the first power supply, and the other end of the fourth resistor is connected to the output end of the first controller; the fourth resistor is used for enabling a pin of the output end of the first controller to be in a low level when the output end of the first controller outputs the second low level signal.

In one possible embodiment, the voltage value of the first power supply is 6V to 26V, and the voltage value of the second power supply is 3.3V or 1.8V.

In a second aspect, the present application further provides a vehicle, the vehicle including a vehicle body, a first controller, a second controller, and a signal transmission circuit provided in any of the above aspects, where the first controller, the second controller, and the signal transmission circuit are disposed in the vehicle body.

The technical scheme of the application comprises at least the following beneficial effects:

the high-level signal of the first voltage provided by the first power supply is converted into the low-level signal by the level conversion module, and the low-level signal output by the first controller is converted into the high-level signal of the second voltage, so that the high-level signal and the low-level signal input to the pin of the second controller can be ensured to be safe and stable signals, and the situation that the second controller is wrong in signal identification or damaged by abnormal voltage signals due to the high-level signal and the low-level signal of fluctuation of external input is avoided.

These and other aspects of embodiments of the present application will be more readily apparent from the following description of the embodiments.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic diagram of a prior art signal transmission circuit.

Fig. 2 shows a schematic structural diagram of a signal transmission circuit according to an embodiment of the present application.

Fig. 3 shows another schematic structural diagram of a signal transmission circuit according to an embodiment of the present application.

Fig. 4 shows a schematic diagram of specific connection of a signal transmission circuit according to an embodiment of the present application.

Fig. 5 shows a schematic structural diagram of a vehicle according to an embodiment of the present application.

Detailed Description

In order to enable those skilled in the art to better understand the present application, the following description will make clear and complete descriptions of the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. In the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

At present, a plurality of different controllers are usually required to realize different functions in a vehicle control circuit, and signal interaction is usually required to be carried out between the different controllers through high-level signals, low-level signals and the like so as to facilitate vehicle control. However, because the environment in the vehicle is complex and changeable, and the wire harness connection between the controllers is often long, the communication between the controllers is easy to be disturbed, the wrong level signal is generated slightly, the communication effect is affected, and the possibility of damaging the controllers exists seriously.

To avoid that signals interacting between the controllers are transmitted by interference, high level signals between the controllers are often set to be large, for example up to 12V or more, directly from the in-car battery power supply. Obviously, the pin of the controller receiving the signal cannot directly receive the high-level signal with higher voltage, so the vehicle circuit generally divides the high-level signal by a resistor voltage division mode before transmitting the high-level signal to the controller, and inputs the signal with smaller voltage after the voltage division to the controller. As shown in fig. 1, the first high level signal output by the first controller is provided by the first power supply, and the first high level signal is obtained by the voltage division effect of the first resistor R1 before being input to the second controller, so as to obtain a smaller voltage signal which can be received by a pin of the second controller.

However, in this signal transmission method, the stability of the voltage signal after voltage division cannot be ensured only by means of resistor voltage division, and especially the first power supply for providing the high-level signal is usually a storage battery in a vehicle, and the voltage value provided by the storage battery often fluctuates greatly during the running process of the vehicle, for example, the actions of charging and discharging, engine running or ignition affect the voltage of the storage battery, and further affect the voltage of the high-level signal transmitted between the controllers. The voltage signal after voltage division cannot be stabilized in a resistor voltage division manner, that is, the voltage signal after voltage division input to the controller also fluctuates with the first power supply. And once the fluctuation range is too large, the error of the recognition result of the controller to the signal is likely to be caused, and the wrong judgment is generated.

And in such a circuit divided by resistors, electromagnetic compatibility (Electromagnetic Compatibility, EMC) disturbances introduced by the first power supply are likely to be transmitted directly into the controller, causing permanent damage to the controller, due to the direct path between the first power supply and the controller.

Therefore, the signal transmission circuit and the vehicle are provided, and the high-level signal and the low-level signal which are input from the outside are converted through the level conversion module, so that the high-level signal and the low-level signal which are input into the second controller in practice can be ensured to be safe and stable, and the error or damage of the identification signal of the second controller caused by the high-level signal and the low-level signal which are fluctuated from the outside is avoided.

Fig. 2 shows a schematic diagram of a signal transmission circuit 10 according to an exemplary embodiment of the present application, where the signal transmission circuit 10 includes a first power supply 100, and the first power supply 100 is connected to an output terminal of a first controller 200 and a first terminal of a level conversion module 300, and is configured to provide a first voltage of a first high level signal to the level conversion module 300 when the output terminal of the first controller outputs a first high level signal, and provide a second voltage of a second low level signal to the level conversion module 300 when the output terminal of the first controller 200 outputs the second low level signal; the first end of the level conversion module 300 is connected to the first power supply 100 and the output end of the first controller 200, the second end of the level conversion module 300 is connected to the input end of the second controller 400, and the level conversion module 300 is configured to convert the first voltage of the first high level signal into a first low level signal or convert the second voltage of the second low level signal into a second high level signal, and input the second high level signal to the input end of the second controller 400.

In this embodiment, the first power supply 100 may be a battery power supply in a vehicle, and the first controller 200 transmits a first high-level signal and a second low-level signal to the second controller 400 through the level conversion module 300 for information interaction. If the first controller 200 needs to output the first high level signal to the second controller 400, the first high level signal transmitted from the first controller 200 to the level conversion module 300 is provided by the first power source 100, and the level conversion module 300 converts the first voltage of the received first high level signal into the first low level signal, and inputs the converted first low level signal to the second controller 400; if the first controller 200 needs to output the second low level signal to the second controller 400, the second voltage of the second low level signal transmitted to the level conversion module 300 is directly provided by the first controller 200, but the level conversion module 300 still converts the second low level signal into the second high level signal and then inputs the second high level signal to the second controller 400. Thus, neither the second high level signal nor the first low level signal received by the second controller 400 is directly supplied by the first power supply 100. That is, the level conversion module 300 separates the first power supply 100 and the first controller 200 from the second controller 400, and no EMC interference generated by the first power supply 100 or the first controller 200 can be directly transmitted to the second controller 400, thereby effectively protecting the second controller 400.

It can be understood that the signal transmission circuit 10 provided in the present application is an active low level circuit, that is, if the pin of the first controller 200 needs to output the first high level signal, the pin will not directly drive the first high level signal to be transmitted, and the first voltage provided by the first power supply 100 connected to the pin is used as the first high level signal transmitted to the level conversion module 300 by outputting the high configuration, that is, disconnecting the circuit connection of the pin. It should be noted that, at this time, the first high-level signal input to the level conversion module 300 is directly provided by the first power source 100, and the first voltage corresponding to the first high-level signal is the voltage that can be provided by the first power source 100, and since the first power source 100 is usually a battery power source in the vehicle control circuit, the voltage provided by the battery power source often fluctuates along with the battery charging and discharging, the engine running or the vehicle ignition, etc., so the first voltage corresponding to the first high-level signal output by the first controller 200 is not stable, and the voltage value thereof may fluctuate at any time. However, the first voltage of the first high level signal is stabilized after passing through the level conversion module 300, and the resulting first low level signal is stabilized. Meanwhile, after the second voltage of the second low level signal directly provided by the first controller 200 passes through the level conversion module 300, the obtained second high level signal is also stable, and the voltage corresponding to the second high level signal is isolated by the level conversion module 300 and is not related to the first power supply 100, so that the voltage is not affected by the voltage fluctuation of the first power supply 100, and therefore the second controller 400 can also receive the stable second high level signal and the stable first low level signal.

As shown in fig. 3, the signal transmission circuit 10 further includes a second power supply 500, where the second power supply 500 is connected to the third terminal of the level conversion module 300; the level conversion module 300 is configured to control, when the first terminal receives the first voltage of the first high-level signal, the input terminal of the second controller 400 to be grounded, so as to input the first low-level signal to the input terminal of the second controller 400; the level conversion module 300 is further configured to control, when the first end receives the second voltage of the second low level signal, the input end of the second controller 400 to communicate with the output end of the second power supply 500, so as to input the second high level signal to the input end of the second controller 400.

In the embodiment of the present application, the level conversion module 300 is capable of separating the second controller 400 from the first power source 100 and the first controller 200 by controlling the input terminal of the second controller 400 to be grounded when receiving the first voltage of the first high-level signal of the first power source 100 and controlling the input terminal of the second controller 400 to be in communication with the output terminal of the second power source 500 when receiving the second voltage of the second low-level signal. That is, the second high level signal and the first low level signal input to the second controller 400 by the level conversion module 300 are respectively provided by the ground and the second power supply 500, independently of the first power supply 100 and the first controller 200. It is thereby possible to separate the second controller 400 from the first power source 100 and the first controller 200, ensuring that EMC interference generated by the first power source 100 or the first controller 200 is not transmitted to the second controller 400. Meanwhile, since the first low-level signal provided by the ground and the second high-level signal provided by the second power supply 500 are stable and do not randomly generate fluctuation, the second controller 400 can receive the stable high-level signal and the stable low-level signal, and the identification of the level signals can be more accurate.

As shown in fig. 4, the level conversion module 300 includes a triode, a first resistor R1 and a second resistor R2, wherein a collector of the triode is connected to an input end of the second controller 400 and to ground as the second end, an emitter of the triode is connected to the second power supply 500 and one end of the first resistor R1 as the third end, a base of the triode is connected to the other end of the first resistor R1 and one end of the second resistor R2, and the other end of the second resistor R2 is connected to the output ends of the first power supply 100 and the first controller 200 as the first end; a transistor for communicating a path between the emitter and the collector in case that the output terminal of the first controller 200 outputs a second low level signal, so that the path between the output terminal of the second power supply 500 and the input terminal of the second controller 400 is communicated; the triode is further used for disconnecting a passage between the emitter and the collector when the output end of the first controller 200 outputs the first high-level signal, so that the input end of the second controller 400 is grounded; the first resistor R1 and the second resistor R2 are used for adjusting a first current flowing through the base electrode of the triode, so that the triode is in a normal working state.

Specifically, the level conversion module 300 converts the input level signal through the transistor, the first resistor R1 and the second resistor R2, specifically, if the output terminal of the first controller 200 outputs the second low level signal, the second low level signal is input to the base of the transistor through the second resistor R2, for the transistor, in the case that the emitter of the transistor is connected to the second power source 500, the voltage of the base is obviously smaller than the voltage of the emitter, the transistor will connect the path between the emitter and the collector, and the collector of the transistor is connected to the input terminal of the second controller 400. That is, in the case that the first controller 200 outputs the second low level signal, the level conversion module 300 communicates the path between the second power supply 500 and the input terminal of the second controller 400, and thus the input terminal of the second controller 400 receives the second high level signal provided by the second power supply 500.

Alternatively, if the output terminal of the first controller 200 outputs the first high level signal provided by the first power source 100, the first high level signal will also enter the base of the triode through the second resistor R2, and the voltage of the base of the triode is obviously greater than the second voltage corresponding to the second power source 500 received by the emitter, so that the triode will break the path between the emitter and the collector, and the second controller 400 connected to the collector will be grounded at this time, so that the input terminal of the second controller 400 can obtain the stable first low level signal through the ground.

It will be appreciated that the second power supply 500 may be a controller power supply, and since the second power supply 500 is used to drive and operate the second controller 400, the second voltage provided by the second power supply 500 does not necessarily exceed the voltage range actually received by the second controller 400, and typically, the second voltage corresponding to the second power supply 500 is 3.3V or 1.8V. The first power supply 100 may be a battery power supply, where the first voltage is typically 12V, and the fluctuation range is large, and may typically fluctuate between 6V and 26V. That is, after the high level signal supplied from the first power supply 100 is inputted to the first terminal of the level conversion module 300, even though the emitter of the transistor is connected to the second power supply 500, it is possible to obtain the second voltage supplied from the second power supply 500, but it is apparent that the second voltage is necessarily smaller than the first voltage supplied from the first power supply 100, that is, the transistor is necessarily disconnected from the path between the emitter and the collector at this time.

In addition, due to the operating characteristics of the transistor, the level conversion module 300 may adjust the first current flowing through the base of the transistor through the first resistor R1 and the second resistor R2, so that the transistor is in a normal operating state, i.e. in an off state or in a saturated on state. In some embodiments, the first resistor R1 may be a 10K resistor, and the second resistor R2 may be a 10K resistor.

In some embodiments, the level conversion module 300 may also include a MOS transistor, and the circuit between the second controller 400 and the second power supply 500 is disconnected when the first high level signal is input to the first controller 200 through the MOS transistor, so that the input terminal of the second controller 400 is grounded, thereby implementing the stable and safe input of the first low level signal to the second controller 400; and a path between the second controller 400 and the second power supply 500 is communicated through the MOS transistor to input the stable and safe second high level information to the second controller 400 through the second power supply 500 in the case that the first controller 200 inputs the second low level signal.

In some embodiments, as shown in fig. 4, the signal transmission circuit 10 further includes a third resistor R3, where one end of the third resistor R3 is connected to the second end of the level conversion module 300 and the input end of the second controller 400, and the other end of the third resistor R3 is grounded; the third resistor R3 is configured to, when the first end of the level conversion module 300 receives the first high level signal, ground the input end of the second controller 400, so that the input end of the second controller 400 receives the first low level signal.

In this embodiment of the present application, the third resistor R3 may provide a stable release path for the energy of the input end of the second controller 400 when the level conversion module 300 breaks the path between the output end of the second controller 400 and the second power supply 500, i.e. the triode is in the off state, that is, by grounding the input end of the second controller 400, it is ensured that it can obtain a stable and accurate first low level signal.

In some embodiments, as shown in fig. 4, the signal transmission circuit 10 further includes a first diode D1, where an anode of the first diode D1 is connected to the first end of the level conversion module 300, and a cathode of the first diode D1 is connected to the first power supply 100 and an output terminal of the first controller 200; the first diode D1 is used to prevent an abnormal voltage from being inputted to the second power supply 500.

It can be appreciated that, according to the characteristics of the diode, when the anode of the first diode D1 is connected to the level conversion module 300 and the cathode is connected to the first power source 100 and the first controller 200, it can prevent the overvoltage voltage, EMC interference, etc. of the first power source 100 or the first controller 200 from being input to the level conversion module 300, and thus, the second power source 500 is interfered.

In addition, in the case that the signal transmission circuit 10 includes the first diode D1, the high level signal of the first voltage provided by the first power source 100 cannot be completely transmitted to the first terminal of the level conversion module 300, because the first diode D1 exists between the first terminal and the first power source 100, and the positive electrode of the first diode D1 is connected to the first terminal of the level conversion module 300, if the negative voltage of the first diode D1 is greater than the positive voltage, the first diode D1 will cut off the circuit. That is, even if the first controller 200 outputs the first high level signal supplied from the first power source 100 at this time, the base voltage of the transistor is at most equal to the emitter voltage, without a case where the base voltage is greater than the emitter voltage. At present, even if the base voltage is equal to the emitter voltage, the triode still works in a cut-off state, the passage between the emitter and the collector is disconnected, and the input end of the second controller 400 is controlled to be grounded, so that a stable first low-level signal is obtained. That is, the first diode D1 may not only protect the transistor in the level conversion module 300, but also further ensure that the transistor outputs a stable first low level signal.

It should be noted that, in the case where the output terminal of the first controller 200 outputs the second low level signal, the magnitude of the second voltage of the second low level signal received by the first terminal of the level conversion module 300 may fluctuate due to the interference of the connection harness between the controllers. Of course, if the second low level signal drops below 0V level, the level shift module 300 can still operate normally according to the preset state according to the above analysis. If the second voltage of the second low level is raised, the signal transmission circuit 10 can work normally only by ensuring that the raised second voltage can normally turn on the triode (i.e. the voltage difference between two ends of the first resistor R1 is 0.7V). At this time, the voltage drop of the second resistor R2 is about 0.7V, the voltage drop of the first diode D1 is about 0.7V, and in order to ensure that the transistor operates normally, the voltage of the base electrode of the first diode D1 needs to be less than 3.3V, so that the negative electrode of the first diode D1, that is, the second voltage of the output terminal of the first controller 200 needs to be less than 3.3V-0.7 v=1.9v, that is, if the voltage value provided by the second power supply 500 is 3.3V, the second voltage of the second low level signal rises by only not more than 1.9V, and the signal transmission circuit 10 can operate normally as expected. In addition, if the voltage value provided by the second power supply 500 is 1.8V, the first diode D1 may be selected as a germanium tube with a lower turn-on voltage, and the turn-on voltage thereof is 0.3V, then it is only necessary to determine that the second voltage of the second low level signal outputted from the output terminal of the first controller 200 is less than 1.8V-0.7V-0.3 v=0.8V, and the signal transmission circuit 10 can operate normally.

In another case, in the case where the output terminal of the first controller 200 outputs the first high level signal, since the first voltage of the first high level signal is supplied from the unstable first power source 100, that is, the first voltage may fluctuate, the voltage value of the first power source typically fluctuates between 6V and 26V. However, if the first voltage is biased downward due to the interference, a certain voltage threshold value of the first voltage is still present under the condition that the voltage value corresponding to the second power supply 500 is 3.3V, and the voltage threshold value is 6V-0.7V-3.3v=2v, where 0.7V is the conduction voltage drop corresponding to the first diode D1. That is, even if there is a disturbance causing the first voltage to decrease, the signal transmission circuit 10 can still operate normally as long as the magnitude of the decrease does not exceed 2V on the basis of the lowest voltage. If the first voltage rises due to the interference, the signal transmission circuit 10 can still work normally according to the analysis.

In some embodiments, as shown in fig. 4, the signal transmission circuit 10 further includes a second diode D2, where a positive electrode of the second diode D2 is connected to the first power source 100, and a negative electrode of the second diode D2 is connected to an output terminal of the first controller 200; the second diode D2 is used to prevent an abnormal voltage from being input to the first power source 100.

It will be appreciated from the above analysis that the diode has an anti-reactive effect, and can cut off overvoltage and EMC interference of the negative electrode, etc., preventing it from interfering with the positive electrode connected device. Therefore, as can be seen from the connection of the second diode D2, the second diode D2 can also block the overvoltage, EMC interference, and the like that may be output from the first controller 200 to which the negative electrode is connected, and prevent the first power supply 100 from being disturbed.

In some embodiments, as shown in fig. 4, the signal transmission circuit 10 further includes a first capacitor C1, one end of the first capacitor C1 is connected to the output end of the first power supply 100 and the first controller 200, and the other end of the first capacitor C1 is grounded; the first capacitor C1 is configured to filter the transient abrupt signal output from the first controller 200.

It can be appreciated that, according to the operation characteristics and the connection characteristics of the capacitors, the first capacitor C1 in the signal transmission circuit 10 provided in the present application can prevent the internal circuit from being damaged by external overvoltage, EMC interference, and the like, and can also filter the input signal glitches such as electrostatic interference (Electro-Sstatic discharge, ESD), and the like.

In some embodiments, as shown in fig. 4, the signal transmission circuit 10 further includes a fourth resistor R4, where one end of the fourth resistor R4 is connected to the first power source 100, and the other end of the fourth resistor R4 is connected to the output end of the first controller 200; the fourth resistor R4 is configured to make a pin of the output terminal of the first controller 200 be at a low level when the output terminal of the first controller 200 outputs the second low level signal.

Specifically, the output end of the first controller 200 is connected to the first power supply 100 through the fourth circuit pull-up, so that when the first controller 200 needs to output the high level signal, the pin of the output end can obtain the high level signal of the stable first voltage provided by the first power supply 100, but not the high level signal of other unexpected magnitude.

In summary, the signal transmission circuit 10 provided in the present application includes a first power supply 100, where the first power supply 100 is connected to an output end of the first controller 200 and a first end of the level conversion module 300, and is configured to provide a first voltage of the first high level signal to the level conversion module 300 when the output end of the first controller 200 outputs the first high level signal, and provide a second voltage of the second low level signal to the level conversion module 300 when the output end of the first controller 200 outputs the second low level signal; the first end of the level conversion module 300 is connected to the first power supply 100 and the output end of the first controller 200, the second end of the level conversion module 300 is connected to the input end of the second controller 400, and the level conversion module 300 is configured to convert the first voltage of the first high level signal into the first low level signal or convert the second voltage of the second low level signal into the second high level signal, and then input the second high level signal to the input end of the second controller 400. The level conversion module 300 converts the externally input high-level signal and low-level signal, so that the high-level signal and low-level signal actually input to the second controller 400 can be ensured to be safe and stable, and the error or damage of the identification signal of the second controller 400 caused by the externally fluctuating high-level signal and low-level signal can be avoided.

Another embodiment of the present application further provides a vehicle, as shown in fig. 5, where the vehicle 20 includes a vehicle body 201, a first controller 200, a second controller 400, and the signal transmission circuit 10 in the above embodiment, and the first controller 200, the second controller 400, and the signal transmission circuit 10 are disposed in the vehicle body 201.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, one of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A signal transmission circuit, the circuit comprising:

the first power supply is connected to the output end of the first controller and the first end of the level conversion module, and is used for providing a first voltage of the first high-level signal to the level conversion module when the output end of the first controller outputs the first high-level signal, and providing a second voltage of the second low-level signal to the level conversion module when the output end of the first controller outputs the second low-level signal;

the first end of the level conversion module is connected to the first power supply and the output end of the first controller, the second end of the level conversion module is connected to the input end of the second controller, and the level conversion module is used for converting the first voltage of the first high-level signal into a first low-level signal or converting the second voltage of the second low-level signal into a second high-level signal and inputting the second high-level signal to the input end of the second controller.

2. The signal transmission circuit of claim 1, further comprising a second power supply connected to a third terminal of the level shift module;

the level conversion module is used for controlling the input end of the second controller to be grounded when the first end receives the first voltage of the first high-level signal so as to input the first low-level signal to the input end of the second controller;

the level conversion module is further configured to control, when the first end receives a second voltage of the second low-level signal, the input end of the second controller to be communicated with the output end of the second power supply, so as to input the second high-level signal to the input end of the second controller.

3. The signal transmission circuit of claim 2, wherein the signal transmission circuit comprises a plurality of signal transmission circuits,

the level conversion module comprises a triode, a first resistor and a second resistor, wherein a collector electrode of the triode is used as the second end to be connected with the input end of a second controller and grounded, an emitter electrode of the triode is used as the third end to be connected with a second power supply and one end of the first resistor, a base electrode of the triode is connected with the other end of the first resistor and one end of the second resistor, and the other end of the second resistor is used as the first end to be connected with the output ends of the first power supply and the first controller;

the triode is used for communicating a passage between the emitter and the collector under the condition that the output end of the first controller outputs a second low-level signal so as to enable the output end of the second power supply to be communicated with the passage between the input end of the second controller;

the triode is also used for disconnecting a passage between the emitter and the collector under the condition that the output end of the first controller outputs the first high-level signal so as to enable the input end of the second controller to be grounded;

the first resistor and the second resistor are used for adjusting the first current flowing through the base electrode of the triode so as to enable the triode to be in a normal working state.

4. The signal transmission circuit of claim 2, further comprising a third resistor, wherein one end of the third resistor is connected to the second end of the level shift module and the input end of the second controller, and the other end of the third resistor is grounded;

the third resistor is used for grounding the input end of the second controller when the first end of the level conversion module receives the first high-level signal, so that the input end of the second controller receives the first low-level signal.

5. The signal transmission circuit according to any one of claims 1 to 4, further comprising a first diode, wherein a positive electrode of the first diode is connected to the first terminal of the level shift module, and a negative electrode of the first diode is connected to the first power supply and an output terminal of the first controller;

the first diode is used for preventing abnormal voltage from being input into the second power supply.

6. The signal transmission circuit according to any one of claims 1 to 4, further comprising a second diode, a positive electrode of the second diode being connected to the first power supply, a negative electrode of the second diode being connected to an output terminal of the first controller;

the second diode is used for preventing abnormal voltage from being input to the first power supply.

7. The signal transmission circuit according to any one of claims 1 to 4, further comprising a first capacitor, wherein one end of the first capacitor is connected to the first power supply and an output terminal of the first controller, and the other end of the first capacitor is grounded;

the first capacitor is used for filtering the transient mutation signal output by the first controller.

8. The signal transmission circuit according to any one of claims 1 to 4, further comprising a fourth resistor, one end of the fourth resistor being connected to the first power supply, and the other end of the fourth resistor being connected to an output terminal of the first controller;

the fourth resistor is used for enabling a pin of the output end of the first controller to be in a low level when the output end of the first controller outputs the second low level signal.

9. The signal transmission circuit according to any one of claims 1 to 4, wherein the voltage value of the first power supply is 6V to 26V, and the voltage value of the second power supply is 3.3V or 1.8V.

10. A vehicle comprising a vehicle body, a first controller, a second controller, and the signal transmission circuit of any one of claims 1-8, the first controller, the second controller, and the signal transmission circuit being disposed within the vehicle body.