Activation circuit and method of automobile communication controller

Abstract

The invention discloses an activation circuit and method of an automobile communication controller. The activation circuit of the automobile communication controller comprises a charging pile communication controller, an NPN transistor, a PNP transistor, a level detection circuit and the automobile communication controller, the CE signal input end of the charging pile communication controller is connected with the base electrode of the NPN transistor, the emitter electrode of the NPN transistor is grounded, the collector electrode of the NPN transistor is connected with the base electrode of the PNP transistor, and the level detection circuit is connected with the level detection circuit. The level detection circuit is connected with the collector electrode of the PNP transistor and the automobile communication controller. The collector electrode of the NPN transistor and the emitter electrode of the PNP transistor are connected with a power supply to supply power. According to the invention, an additional control signal is not needed, and the activation of the automobile communication controller can be realized by depending on the CE signal only through the NPN transistor, the PNP transistor and the level detection circuit.

Description

Technical Field

[0001] The present invention application relates to the field of integrated circuits, and specifically relates to an activation circuit and method for an automotive communication controller. Background Art

[0002] With the rapid development of megawatt-level high-power charging technology (MCS), the electric vehicle communication controller (EVCC), as the core communication hub between the charging pile and the vehicle battery management system (BMS), the low-power operation and reliable wake-up mechanism in its sleep state have become the focus of the industry. The Charge Enable (CE) signal defined in the international standard IEC 61851-23-3, as the charging enable instruction sent by the charging pile communication controller (SECC) to the vehicle side, directly determines the state transition of the EVCC from sleep to activation.

[0003] The existing EVCC activation technologies mainly have the following two implementation methods: 1. By adding an independent wake-up signal line in the vehicle control unit (VCU), and the charging pile sends a dedicated wake-up instruction. 2. The EVCC still keeps the CE signal detection circuit powered in the sleep state, and judges the signal state by periodic sampling. However, the former is difficult to adapt to the plug-and-charge requirement under the IEC 61851-23-3 standard due to relying on non-standard hardware expansion, and the monitoring circuit of the latter also needs to maintain power consumption all the time, resulting in unnecessary power consumption during vehicle parking, and in severe cases, causing the battery to run out of power. Summary of the Invention

[0004] The present invention application provides an activation circuit and method for an automotive communication controller, which can realize the activation of the automotive communication controller depending on the CE signal only through an NPN transistor, a PNP transistor and a level detection circuit without additional control signals.

[0005] To achieve the above beneficial effects, the present invention application provides the following technical solutions: In a first aspect, the present application provides an activation circuit for an automotive communication controller, including: a charging pile communication controller, an NPN transistor, a PNP transistor, a level detection circuit and an automotive communication controller; The CE signal input end of the charging pile communication controller is connected to the base of the NPN transistor, the emitter of the NPN transistor is grounded, the collector of the NPN transistor is connected to the base of the PNP transistor, and the level detection circuit is respectively connected to the collector of the PNP transistor and the automotive communication controller; The collector of the NPN transistor and the emitter of the PNP transistor are both connected to a power supply for power supply.

[0006] In one embodiment, a first resistor is connected in series between the base of the NPN transistor and the CE signal input terminal of the charging pile communication controller. The resistance value of the first resistor ranges from 1 kΩ to 10 kΩ, which is used to limit the base current and adapt to the CE signal input with a voltage of 5V.

[0007] In one embodiment, a second resistor is connected in series between the collector of the NPN transistor and the base of the PNP transistor. The resistance value of the second resistor is 1 / 5 to 1 / 2 of the resistance value of the first resistor, which is used to optimize the driving efficiency between the NPN transistor and the PNP transistor.

[0008] In one embodiment, a third resistor is connected in series between the collector of the NPN transistor and the power supply, and a fourth resistor is connected in series between the emitter of the PNP transistor and the power supply. The third resistor and the fourth resistor are respectively used to adjust the operating currents of the NPN transistor and the PNP transistor.

[0009] In one embodiment, the power supply is a vehicle-mounted battery, the voltage range of the battery is 12V to 48V, and the emitter of the PNP transistor is connected to the power supply through a diode, and the cathode of the diode faces the power supply.

[0010] In one embodiment, the level detection circuit includes a comparator module. The reference voltage of the comparator module is set according to the voltage range of the battery. The comparator module is used to compare the voltage output from the collector of the PNP transistor with the reference voltage to trigger the activation signal of the vehicle communication controller.

[0011] In one embodiment, the level detection circuit further includes a delay circuit. The delay circuit is connected to the output terminal of the comparator module. The delay time of the delay circuit is 10 ms to 100 ms, which is used to delay the triggering of the activation signal of the vehicle communication controller after detecting the CE signal.

[0012] In one embodiment, the circuit further includes an overvoltage protection module. The overvoltage protection module is connected across the CE signal input terminal of the charging pile communication controller and the ground terminal, and includes a zener diode and a transient voltage suppressor, which are used to limit the voltage peak value at the CE signal input terminal.

[0013] In one embodiment, the NPN transistor and the PNP transistor are of a complementary pair tube type, and the maximum collector currents of the NPN transistor and the PNP transistor are both greater than 100 mA.

[0014] In a second aspect, the present application provides an activation method for a vehicle communication controller, including: Detect the CE signal sent by the charging pile communication controller, input the CE signal to the base of the NPN transistor, and control the collector of the NPN transistor to output a control signal; Drive the base of the PNP transistor according to the control signal, so that the collector of the PNP transistor outputs a level signal; Monitor the level signal through a level detection circuit, and generate an activation signal when a level jump is detected; Transmit the activation signal to the vehicle communication controller to exit the sleep state and start charging.

[0015] The activation circuit of the vehicle communication controller provided by the present invention application includes a charging pile communication controller, an NPN transistor, a PNP transistor, a level detection circuit, and a vehicle communication controller. The CE signal input terminal of the charging pile communication controller is connected to the base of the NPN transistor. The emitter of the NPN transistor is grounded. The collector of the NPN transistor is connected to the base of the PNP transistor. The level detection circuit is respectively connected to the collector of the PNP transistor and the vehicle communication controller. The collector of the NPN transistor and the emitter of the PNP transistor are both connected to the power supply for power supply. The present invention application does not require an additional control signal, and the activation of the vehicle communication controller can be realized depending on the CE signal only through the NPN transistor, the PNP transistor, and the level detection circuit. Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the present invention application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention application. For those skilled in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0017] Figure 1 It is the first structural schematic diagram of the activation circuit of the vehicle communication controller provided by the present invention application; Figure 2 It is the second structural schematic diagram of the activation circuit of the vehicle communication controller provided by the present invention application; Figure 3 It is the flow schematic diagram of the activation method of the vehicle communication controller provided by the present invention application. Detailed Embodiments

[0018] The following will clearly and completely describe the technical solutions in the present invention application with reference to the drawings in the present invention application. Obviously, the described embodiments are only some embodiments of the present invention application, rather than all embodiments. Based on the embodiments in the present invention application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention application.

[0019] As used herein, the mention of "embodiment" means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of the present invention application. The appearance of this phrase at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0020] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of an activation circuit of an automotive communication controller provided by the present invention application. The activation circuit of the automotive communication controller includes a charging pile communication controller, an NPN transistor, a PNP transistor, a level detection circuit, and an automotive communication controller. Among them, the charging pile communication controller (SECC) serves as a signal source and can output a ChargeEnable (CE) signal. The output terminal of the charging pile communication controller can be connected to the base of the NPN transistor through a line. Specifically, the charging pile communication controller can generate a CE activation signal of 5V ± 0.5V according to the charging protocol. This signal is active high, and the duration is synchronized with the charging start phase.

[0021] The NPN transistor includes a base, an emitter, and a collector. Among them, the base of the NPN transistor receives the CE signal from the charging pile communication controller. The emitter of the NPN transistor is directly grounded to provide a current loop. The collector of the NPN transistor can be connected to the base of the PNP transistor through a line, and at the same time, the collector is also connected to the power supply.

[0022] The PNP transistor also includes a base, an emitter, and a collector. Among them, the base of the PNP transistor is connected to the collector of the NPN transistor. The emitter of the PNP transistor is connected to the power supply to provide electrical energy for its own operation. The collector of the PNP transistor is connected to the level detection circuit, and at the same time, the collector can also be grounded through a resistor, and this resistor plays a pulling-down role.

[0023] The input terminal of the level detection circuit is connected to the collector of the PNP transistor to detect the level state of this node. The output terminal is connected to the automotive communication controller. When a qualified level change is detected, a signal can be sent to the automotive communication controller. The automotive communication controller can receive the signal from the level detection circuit and decide whether to activate from the sleep state and enter the normal working state according to the received signal. It should be noted that the power consumption of the automotive communication controller in the sleep state is lower than that in the working state. After successful activation, the automotive communication controller can exit the sleep state and enter the normal working mode for charging.

[0024] In one embodiment, a first resistor may also be connected in series between the base of the NPN transistor and the CE signal input terminal of the charging pile communication controller. The resistance value of the first resistor ranges from 1 kΩ to 10 kΩ and is used to limit the base current and adapt to the CE signal input with a voltage of 5V. During actual use, the CE signal output by the SECC is a 5V voltage. If directly connected to the base of the NPN transistor, the transistor may be burned out due to excessive current. The first resistor controls the current flowing into the NPN transistor to ensure that the current is within a safe range. At the same time, the international standard stipulates that the CE signal is a 5V level, but there may be fluctuations in actual applications (such as 4.5V to 5.5V). The first resistor can ensure that the CE signal can normally drive the NPN transistor to work within this range, avoiding circuit failures caused by voltage fluctuations. In addition, when the CE signal is instantaneously interfered with, the first resistor also slows down the voltage change rate, making the NPN transistor "insensitive" to short-term interference and only responding to valid signals with a long enough duration.

[0025] In one embodiment, a second resistor is connected in series between the collector of the NPN transistor and the base of the PNP transistor. The resistance value of the second resistor is 1 / 5 to 1 / 2 of the resistance value of the first resistor and is used to optimize the driving efficiency between the NPN transistor and the PNP transistor. Specifically, when the NPN transistor is turned on, the CE signal is high. The second resistor limits the current to ensure that the base voltage of the PNP transistor is pulled down to a low enough level to reliably turn off the PNP transistor, thereby triggering the wake-up signal. When the NPN transistor is turned off, the CE signal is low. The second resistor can increase the base voltage of the PNP transistor, and the PNP transistor is turned on, and the circuit remains in the standby state. In addition, the second resistor can also maximize the signal transmission efficiency between the NPN transistor and the PNP transistor by adjusting its own resistance value and reduce signal distortion. If the resistance value is too small, excessive current may be generated when the NPN transistor is turned on, burning out the PNP transistor or affecting the performance of the NPN transistor. If the resistance value is too large, the base voltage of the PNP transistor cannot be effectively pulled up when the NPN transistor is turned off, resulting in the PNP transistor not being able to conduct normally. Therefore, in this embodiment, the resistance value of the second resistor is set to 1 / 5 to 1 / 2 of the resistance value of the first resistor, which can improve the performance of the NPN transistor and the PNP transistor.

[0026] In one embodiment, please continue to refer to Figure 2 , a third resistor is connected in series between the collector of the NPN transistor and the power supply, and a fourth resistor is connected in series between the emitter of the PNP transistor and the power supply. The third resistor and the fourth resistor are respectively used to adjust the working current of the NPN transistor and the PNP transistor. Specifically, the third resistor can adjust the collector current of the NPN transistor to ensure that it is in a saturated state when the CE signal is at a high level, while the fourth resistor can limit the emitter current of the PNP transistor, optimize the circuit power consumption and protect the device.

[0027] In the application of the present invention, the level signal output by the charging pile communication controller can affect the sleep state or activation state of the vehicle communication controller. For example, when the charging pile communication controller outputs a low level signal (i.e., CE = 0): At this time, the current flowing into the base of the NPN transistor is extremely small, and the NPN transistor is in a cut-off state. Since the NPN transistor is cut off, the collector potential is close to the power supply voltage (realized through the resistor connected to the collector), making the base potential of the PNP transistor relatively high. For the PNP transistor, when the base potential is higher than the emitter potential, the PNP transistor conducts. After the PNP transistor conducts, its collector potential is pulled down (close to the ground potential, realized through the resistor connected to the collector), and the level detection circuit detects the low level signal and does not send an activation signal to the vehicle communication controller, and the vehicle communication controller remains in the sleep state.

[0028] When the charging pile communication controller outputs a high level signal (i.e., CE = 1): A suitable current flows into the base of the NPN transistor, and the NPN transistor conducts. After the NPN transistor conducts, its collector potential is pulled down (close to the ground potential), resulting in a decrease in the base potential of the PNP transistor. When the base potential of the PNP transistor is lower than the emitter potential, the PNP transistor is cut off. After the PNP transistor is cut off, its collector potential rises (close to the power supply voltage), and the level detection circuit detects the high level signal and sends an activation signal to the vehicle communication controller. After receiving the signal, the vehicle communication controller is activated from the sleep state and enters the normal working state.

[0029] In one embodiment, the power supply is a vehicle-mounted battery, the voltage range of the battery is 12V to 48V, and the emitter of the PNP transistor is connected to the power supply through a diode, with the cathode of the diode facing the power supply. This connection method enables the current to only flow from the power supply (battery) through the diode to the emitter of the PNP transistor and cannot flow in the reverse direction, reflecting the unidirectional conductivity of the diode. Specifically, when the vehicle-mounted battery is reversely connected due to an operation error, the above diode will be cut off due to reverse bias, blocking the reverse current path, and preventing components such as the PNP transistor and the resistor network from being burned due to the reverse voltage, protecting the entire activation circuit. In addition, voltage spikes or ripples may occur during the startup, charging, etc. of the vehicle-mounted battery. The diode can isolate the transient interference on the power supply side to a certain extent, ensure the voltage stability of the emitter of the PNP transistor, and avoid the misactivation or inability to activate of the EVCC due to power fluctuations. When the EVCC is in the sleep state and there is no CE signal, the diode is cut off, the current path between the emitter of the PNP transistor and the power supply is cut off, and only a very small reverse leakage current remains, further reducing the static power consumption of the circuit, meeting the low-power design goal.

[0030] In one embodiment, the level detection circuit includes a comparator module. The reference voltage of the comparator module is set according to the voltage range of the battery. The comparator module is used to compare the voltage output from the collector of the PNP transistor with the reference voltage to trigger the activation signal of the vehicle communication controller. Among them, the voltage output from the collector of the PNP transistor is connected to one input terminal of the comparator, and the other input terminal of the comparator is connected to a preset reference voltage. Next, when the PNP collector voltage > reference voltage, the comparator outputs a high level (such as 5V), indicating that a valid activation signal is detected, and triggering the EVCC to exit the sleep state. When the PNP collector voltage ≤ reference voltage, the comparator outputs a low level (such as 0V), indicating that no activation signal is detected, and the EVCC maintains the sleep state. When setting the reference voltage, the reference voltage can be set to half of the battery voltage, which can not only distinguish high and low levels but also avoid false triggering caused by battery voltage fluctuations.

[0031] In one embodiment, the level detection circuit further includes a delay circuit. The delay circuit is connected to the output terminal of the comparator module. The delay time of the delay circuit is 10ms to 100ms, and it is used to delay the triggering of the activation signal of the vehicle communication controller after detecting the CE signal. Among them, the above delay circuit can be composed of an RC delay network (resistor R and capacitor C in series) or a digital timer chip (such as a 555 timer, programmable logic device), and is connected between the output terminal of the comparator module and the EVCC activation signal input terminal. When the comparator detects the CE signal and outputs a high level, this signal first enters the delay circuit, and the delay circuit starts timing. After a set delay time (10ms~100ms), the activation signal is transmitted to the EVCC to trigger its wake-up action. This design aims at the signal glitch interference and system timing matching requirements in the in-vehicle charging scenario. By introducing a controllable time window, it improves the reliability and stability of the EVCC activation process.

[0032] In one embodiment, the circuit further includes an overvoltage protection module. The overvoltage protection module is connected across the CE signal input terminal and the ground terminal of the charging pile communication controller, and includes a zener diode and a transient voltage suppressor, which are used to limit the voltage peak value at the CE signal input terminal. Among them, the zener diode has a reverse breakdown characteristic and is used to set the voltage clamping threshold. The response speed of the transient voltage suppressor is in the nanosecond level and can absorb transient power of up to several kilowatts. The connection relationship is as follows: after the zener diode and the transient voltage suppressor are connected in parallel, they are connected across the CE signal input terminal (i.e., the base of the NPN transistor) and the ground terminal to form a voltage clamping branch. In actual use, when a transient overvoltage appears at the CE input terminal (such as the charging pile mistakenly outputs 12V voltage, or the vehicle power supply is reversely connected resulting in a reverse voltage), and the voltage exceeds the breakdown voltage of the zener diode (such as 6.8V), the zener diode breaks down reversely and enters the voltage stabilization state, clamping the voltage at about 6.8V. If the overvoltage is a high-frequency pulse, the transient voltage suppressor responds quickly, absorbs energy through avalanche breakdown, and further limits the voltage peak value within a safe range (such as ≤7V), thereby realizing the protection of the front-end circuit.

[0033] In one embodiment, the models of the NPN transistor and the PNP transistor are matched as complementary pair transistors, and the maximum collector current of both the NPN transistor and the PNP transistor is greater than 100 mA. Specifically, the NPN transistor can be turned on by inputting a high level (such as a 5V CE signal) to the base, and the current flows from the collector to the emitter. While the PNP transistor is turned on by inputting a low level to the base, and the current flows from the emitter (connected to the battery constant power) to the collector. When the PNP transistor in the circuit is turned on, the collector current mainly flows to the level detection circuit, usually in the microampere level. Therefore, a current capacity of 100 mA provides a safety margin of ten thousand times, ensuring the reliability during use.

[0034] As described above, the activation circuit of the vehicle communication controller provided by the present invention application includes a charging pile communication controller, an NPN transistor, a PNP transistor, a level detection circuit, and a vehicle communication controller. The CE signal input terminal of the charging pile communication controller is connected to the base of the NPN transistor, the emitter of the NPN transistor is grounded, the collector of the NPN transistor is connected to the base of the PNP transistor, the level detection circuit is respectively connected to the collector of the PNP transistor and the vehicle communication controller, and the collector of the NPN transistor and the emitter of the PNP transistor are both connected to the power supply for power supply. The present invention application does not require an additional control signal, and can activate the vehicle communication controller depending on the CE signal only through the NPN transistor, the PNP transistor, and the level detection circuit.

[0035] The present invention application also provides an activation method for an automotive communication controller. The execution subject of the activation method for the automotive communication controller can be an activation device for the automotive communication controller, or a server integrated with the activation device for the automotive communication controller. Among them, the activation device for the automotive communication controller can be implemented in a hardware or software manner.

[0036] In this embodiment, a description will be made from the perspective of the activation device for the automotive communication controller. The activation device for the automotive communication controller can be specifically integrated in a terminal device, and the terminal device is a terminal device with a storage unit and capable of running application programs. According to the activation circuit of the automotive communication controller described in the previous embodiment, further detailed description will be given by way of example below.

[0037] In this embodiment, an example will be given with the activation device for the automotive communication controller specifically integrated in the terminal device.

[0038] Please refer to Figure 3 , Figure 3 which is a schematic flowchart of the activation method for the automotive communication controller provided by the present invention application. The method process may include: Step 101, detect the CE signal sent by the charging pile communication controller, input the CE signal to the base of the NPN transistor, and control the collector of the NPN transistor to output a control signal.

[0039] In one embodiment, the CE signal with a voltage of 5V sent by the charging pile communication controller (SECC) is connected to the base of the NPN transistor, and the emitter of the transistor is grounded to form a base-emitter loop. When the CE signal is at a high level, the NPN transistor conducts, and its collector potential drops (close to the ground level); when the CE signal is at a low level, the NPN transistor is cut off, and the collector potential is determined by the subsequent circuit (PNP base resistor). The NPN collector is connected to the base of the PNP transistor through a resistor, and the change of its output high and low levels serves as the control signal for the PNP.

[0040] Step 102, drive the base of the PNP transistor according to the control signal so that the collector of the PNP transistor outputs a level signal.

[0041] In one embodiment, the emitter of the PNP transistor is connected to the constant battery power (such as 12V) to provide the working power supply for the circuit. When the NPN collector is at a low level (the CE signal is valid), the potential of the PNP base decreases, meeting the conduction condition (the PNP needs the base potential to be lower than the emitter), and its collector outputs a high level (close to the constant battery voltage). When the NPN collector is at a high level (the CE signal is invalid), the PNP base potential is close to the emitter, the transistor is cut off, and the collector outputs a low level (grounded through a pull-down resistor). The high / low level signal output by the PNP collector reflects the state change of the CE signal, and this signal is input to the level detection circuit.

[0042] Step 103, monitor the level signal through the level detection circuit, and generate an activation signal when a level jump is detected.

[0043] In one embodiment, the level detection circuit monitors the level signal of the PNP collector in real time. When a jump from low to high is detected (i.e., the CE signal changes from invalid to valid), the activation logic is triggered. After the level jump is recognized, the circuit generates an activation signal to wake up the EVCC.

[0044] Step 104, transmit the activation signal to the vehicle communication controller to exit the sleep state and start charging.

[0045] In one embodiment, the activation signal is transmitted to the electric vehicle communication controller (EVCC) through a dedicated line. After receiving the activation signal, the EVCC exits the sleep state, starts the internal communication module and the charging control logic. After the EVCC completes the communication handshake with the charging pile, the charging process is triggered to achieve safe and efficient charging operations.

[0046] As can be seen from the above, the activation method of the vehicle communication controller provided by the present invention application can detect the CE signal sent by the charging pile communication controller, input the CE signal to the base of the NPN transistor, and control the NPN transistor to output a control signal at the collector. According to the control signal, the base of the PNP transistor is driven so that the collector of the PNP transistor outputs a level signal. The level signal is monitored through the level detection circuit, and an activation signal is generated when a level jump is detected. The activation signal is transmitted to the vehicle communication controller to exit the sleep state and start charging. The present invention application does not require an additional control signal, and only relies on the CE signal to activate the vehicle communication controller through the NPN transistor, PNP transistor and level detection circuit.

[0047] Those of ordinary skill in the art can understand that all or part of the steps in the above various methods can be completed by instructions, or by controlling related hardware through instructions. The instructions can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0048] Although the present application for invention has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art based on a reading and understanding of this specification and the drawings. The present application for invention includes all such modifications and variations and is limited only by the scope of the appended claims. In particular with respect to the various functions performed by the above-described components, the terms used to describe such components are intended to correspond to any component that performs the specified function of the described component (e.g., it is functionally equivalent), unless otherwise indicated, even if structurally different from the disclosed structure that performs the function in the exemplary implementations of the present specification shown herein. Moreover, although a particular feature of this specification has been disclosed with respect to only one of several implementations, such feature may be combined with one or more other features of other implementations as may be desired and advantageous for a given or particular application. Also, insofar as the terms "comprises," "has," "contains," or any variation thereof are used in a particular embodiment or claim, such terms are intended to include in a manner similar to the term "includes."

[0049] The above has introduced in detail an activation circuit and method for an automotive communication controller provided by the present application for invention. Specific examples are used herein to illustrate the principle and implementation of the present application for invention. The description of the above embodiments is only to help understand the method and its core idea of the present application for invention; at the same time, for those skilled in the art, according to the idea of the present application for invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be construed as a limitation to the present application for invention.

Claims

1. An activation circuit for an automotive communication controller, characterized in that, Including: A charging pile communication controller, an NPN transistor, a PNP transistor, a level detection circuit, and an automotive communication controller; The CE signal input terminal of the charging pile communication controller is connected to the base of the NPN transistor, the emitter of the NPN transistor is grounded, the collector of the NPN transistor is connected to the base of the PNP transistor, and the level detection circuit is respectively connected to the collector of the PNP transistor and the automotive communication controller; The collector of the NPN transistor and the emitter of the PNP transistor are both connected to a power supply for power supply.

2. The activation circuit of the vehicle communication controller according to claim 1, wherein A first resistor is connected in series between the base of the NPN transistor and the CE signal input terminal of the charging pile communication controller. The resistance value range of the first resistor is from 1 kΩ to 10 kΩ, which is used to limit the base current and adapt to the input of a CE signal with a voltage of 5V.

3. The activation circuit of the vehicle communication controller according to claim 2, characterized in that, A second resistor is connected in series between the collector of the NPN transistor and the base of the PNP transistor. The resistance value of the second resistor is 1 / 5 to 1 / 2 of the resistance value of the first resistor, which is used to optimize the driving efficiency between the NPN transistor and the PNP transistor.

4. The activation circuit of the vehicle communication controller according to claim 3, characterized in that, A third resistor is connected in series between the collector of the NPN transistor and the power supply, and a fourth resistor is connected in series between the emitter of the PNP transistor and the power supply. The third resistor and the fourth resistor are respectively used to adjust the working current of the NPN transistor and the PNP transistor.

5. The activation circuit of the vehicle communication controller according to claim 1, characterized in that The power supply is a vehicle-mounted battery. The voltage range of the battery is from 12V to 48V. And the emitter of the PNP transistor is connected to the power supply through a diode, and the cathode of the diode faces the power supply.

6. The activation circuit of the vehicle communication controller according to claim 5, characterized in that The level detection circuit includes a comparator module. The reference voltage of the comparator module is set according to the voltage range of the battery. The comparator module is used to compare the voltage output by the collector of the PNP transistor with the reference voltage to trigger the activation signal of the automotive communication controller.

7. The activation circuit of the vehicle communication controller according to claim 6, characterized in that, The level detection circuit further includes a delay circuit. The delay circuit is connected to the output terminal of the comparator module. The delay time of the delay circuit is from 10 ms to 100 ms, which is used to delay the triggering of the activation signal of the automotive communication controller after detecting the CE signal.

8. The activation circuit of the vehicle communication controller according to claim 1, characterized in that The activation circuit of the automotive communication controller further includes an overvoltage protection module. The overvoltage protection module is connected across the CE signal input terminal of the charging pile communication controller and the ground terminal, and includes a zener diode and a transient voltage suppressor, which are used to limit the voltage peak value at the CE signal input terminal.

9. The activation circuit of the vehicle communication controller according to claim 1, characterized in that The models of the NPN transistor and the PNP transistor are matched as complementary pair transistors, and the maximum collector current of both the NPN transistor and the PNP transistor is greater than 100 mA.

10. A method for activating an automotive communication controller, characterized in that, The method includes: Detect the CE signal sent by the charging pile communication controller, input the CE signal to the base of the NPN transistor, and control the collector of the NPN transistor to output a control signal; Drive the base of the PNP transistor according to the control signal, so that the collector of the PNP transistor outputs a level signal; Monitor the level signal through the level detection circuit, and generate an activation signal when a level jump is detected; Transmit the activation signal to the vehicle communication controller to exit the sleep state and start charging.

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