Tbox disconnection wake-up circuit and wake-up method

Abstract

The application discloses a Tbox disconnection wake-up circuit and a wake-up method thereof, and the Tbox disconnection wake-up circuit comprises a charging lithium battery BAT, an N-channel field effect tube Q2 for disconnection detection, a P-channel field effect tube Q1 for supplying power to a voltage output circuit, the voltage output circuit, and a P-channel field effect tube Q4 for wake-up voltage output. The application provides a circuit capable of waking up the Tbox when the low-voltage storage battery of an electric vehicle is in a power shortage state and the power battery is removed, and ensures that there is enough time to judge that the detection line input port is in a suspended state after the Tbox is woken up, and the state is reported to a platform, so that the manager of the vehicle can obtain the state that the power battery is removed through the platform, and the safety risks such as electric shock of personnel are avoided to a certain extent. When the power battery is not removed, the power consumption circuit of the whole circuit is in a microampere level, the power consumption is very low, and the standby time can be effectively prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of Tbox wake-up circuit, and particularly relates to a Tbox disconnection wake-up circuit and a wake-up method. BACKGROUND

[0002] The automobile Tbox means Telematics-BOX, which is short for vehicle-mounted T-BOX. The vehicle networking system comprises four parts, i.e. a host, a vehicle-mounted T-BOX, a mobile phone APP and a background system.

[0003] The Tbox is a remote communication module of an electric vehicle, and is responsible for the collection and reporting of the whole vehicle data, alarm data and positioning data of the electric vehicle. When the vehicle is turned off and powered off, the Tbox can usually be powered by the low-voltage storage battery of the vehicle and can be automatically woken up to send positioning information to the platform. On a new energy vehicle, the voltage of the power battery is as high as several hundred volts. When the power battery is removed, it is dangerous. The removal state of the power battery can be detected by the Tbox. Once the power battery is removed, the Tbox can be woken up, and the Tbox will report the removal state to the platform to remind the vehicle manager that the power battery has been removed, which has the risk of high-voltage electric shock. However, if the vehicle is parked for a long time, the low-voltage storage battery is in a state of power loss. At this time, the Tbox cannot be started due to the low voltage of the low-voltage storage battery, so it cannot send the state of the power battery being removed to the platform, which has a certain risk of electric shock.

[0004] For the manager of the electric vehicle, it is hoped that once the power battery is removed, the information of the power battery being removed can still be obtained at the first time even in the state of power loss of the low-voltage storage battery, so as to avoid the risk of electric shock to the greatest extent. Therefore, a Tbox wake-up circuit is needed to realize this requirement. SUMMARY

[0005] The application aims to solve the technical problems of the above-mentioned technical defects, and provides a Tbox disconnection wake-up circuit and a wake-up method.

[0006] In order to solve the above-mentioned technical problems, the application adopts the following technical scheme:

[0007] A Tbox disconnection wake-up circuit, comprising a charging lithium battery BAT, an N-channel field effect tube Q2 for disconnection detection, a P-channel field effect tube Q1 for power supply of a voltage output circuit, the voltage output circuit, a P-channel field effect tube Q4 for wake-up voltage output, the charging lithium battery BAT is installed inside the Tbox, the negative electrode of the charging lithium battery BAT is grounded, the positive electrode is connected to the anode of a diode D1, the cathode of the diode D1 is connected to one end of a resistor R1, the other end of the resistor R1 is connected to the gate of the N-channel field effect tube Q2 together with a detection line input end, the detection line input end is connected to the shell of a power battery of a vehicle, a capacitor C2 and a transient voltage suppressor TVS2 are connected in parallel between the gate and the source of the N-channel field effect tube Q2, the source of the N-channel field effect tube Q2 is grounded;

[0008] The positive electrode of the charging lithium battery BAT is connected to the source of the P-channel field effect tube Q1, the gate of the P-channel field effect tube Q1 is connected to the drain of the N-channel field effect tube Q2, a capacitor C1, a resistor R2 and a transient voltage suppressor TVS1 are connected in parallel between the source and the gate of the P-channel field effect tube Q1;

[0009] The drain of the P-channel field effect tube Q1 is connected to one end of a resistor R5 and a capacitor C3, the other end of the resistor R5 and the capacitor C3 are connected together and then connected to one end of a resistor R4, the other end of the resistor R4 is connected to one end of a resistor R3 and the base of an NPN triode Q3, the other end of the resistor R3 is grounded, the emitter of the NPN triode Q3 is grounded;

[0010] The positive electrode of the charging lithium battery BAT is connected to the source of the P-channel field effect tube Q4, a resistor R6 and a capacitor C4 are connected in parallel between the source and the gate of the P-channel field effect tube Q4, the gate of the P-channel field effect tube Q4 is connected to the collector of the NPN triode Q3, and the drain of the P-channel field effect tube Q4 is connected to a wake-up output port.

[0011] As a preferred scheme, the voltage output circuit comprises the P-channel field effect tube Q4, the resistor R6 and the capacitor C4.

[0012] As a preferred scheme, the resistance value of the resistor R1 is 1MΩ, the resistance value of the resistor R2 is 500KΩ, the resistance value of the resistor R3 is 15KΩ, the resistance value of the resistor R4 is 25KΩ, the resistance value of the resistor R5 is 1MΩ, the resistance value of the resistor R6 is 1MΩ, the capacitance of the capacitor C1 is 0.1uF, the capacitance of the capacitor C2 is 2.2nF, the capacitance of the capacitor C3 is 100uF, and the capacitance of the capacitor C4 is 0.1uF.

[0013] As a preferred scheme, the resistor R5 is a mega-ohm level, which will not cause a large current to flow through the resistor R5 and then flow through the resistor R4, and the resistor R5 is used for slow discharge of the capacitor C3 without affecting the charging of the capacitor C3.

[0014] The application discloses a wake-up method of a Tbox disconnection wake-up circuit, and relates to the technical field of Tbox wake-up circuits.

[0015] When the power battery of the vehicle is not removed, the shell of the power battery is normally grounded, the detection line input port is in a grounded state, the gate of the N-channel field effect tube Q2 is in a grounded state, the N-channel field effect tube Q2 is in a cut-off state, the high level from the positive electrode of the charging lithium battery BAT is input to the gate of the P-channel field effect tube Q1 through the resistor R2, the gate of Q1 is in a high level due to the cut-off state of the N-channel field effect tube Q2, the P-channel field effect tube Q1 is in a cut-off state, and thus the drain of Q1 has no voltage output, so that the base of the NPN triode Q3 has no voltage current, and Q3 is in a cut-off state; the high level from the positive electrode of the charging lithium battery BAT is input to the gate of the P-channel field effect tube Q4 through the resistor R6, the gate of Q4 is in a high level due to the cut-off state of the NPN triode Q3, the P-channel field effect tube Q4 is in a cut-off state, at this time, the drain of the P-channel field effect tube Q4 has no high level output, that is, the wake-up output port has no high level output, and the Tbox cannot be woken up.

[0016] When the power battery of the vehicle is removed, the shell of the power battery is separated from the vehicle and not grounded, so that the detection line input port is in a floating state, at this time, the high level from the positive electrode of the charging lithium battery BAT is input to the gate of the N-channel field effect tube Q2 through the diode D1 and the resistor R1, the N-channel field effect tube Q2 is turned on, the gate of the P-channel field effect tube Q1 is connected to the ground through the drain of the N-channel field effect tube Q2, so that the P-channel field effect tube Q1 is turned on, the high level from the positive electrode of the charging lithium battery BAT is output to the drain of the P-channel field effect tube Q1 through the source of the P-channel field effect tube Q1, the high level of the drain of the P-channel field effect tube Q1 charges the capacitor C3 through the resistor R4, in the charging process, current flows through the capacitor C3, the resistor R4 and the base of the NPN triode Q3, so that the NPN triode Q3 is in a conducting state in the charging process of the capacitor C3, the collector of the NPN triode Q3 pulls down the level of the gate of the P-channel field effect tube Q4, so that the P-channel field effect tube Q4 is in a conducting state in the charging process of the capacitor C3, the high level from the positive electrode of the charging lithium battery BAT is output to the drain of the P-channel field effect tube Q4 through the source of the P-channel field effect tube Q4, the wake-up output port outputs a high level, and the Tbox is woken up.

[0017] As a preferred solution, in the process of waking up the Tbox, the Tbox detects the high level through the detection line input port, so as to judge that the power battery is removed and separated from the vehicle, the Tbox enters a sleep state after sending the state that the power battery is removed to the platform.

[0018] As a preferred solution, the platform refers to the operation platform of the enterprise, and when the Tbox sends the state that the power battery is removed to the platform, the operation enterprise can know that the power battery is removed.

[0019] As a preferred solution, the gate of the N-channel field effect tube Q2 is connected to the detection line input port, and in the external circuit, the detection line is connected to the shell of the power battery, and when the power battery is not removed, the shell is grounded, so that the detection line input port is also in a grounded state; when the power battery is removed, the shell is separated from the vehicle and is not grounded, so that the detection line input port is in a floating state.

[0020] As a preferred solution, when the power battery of the vehicle is not removed, the entire circuit consumes the electric energy of the charged lithium battery BAT, and the main power consumption circuit A is a circuit passing through the diode D1, the resistor R1 and the ground of the power battery shell; the power consumption circuit B is a circuit for maintaining the P-channel field effect tube Q1 in a cut-off state through R2; and the power consumption circuit C is a circuit for maintaining the P-channel field effect tube Q4 in a cut-off state through the resistor R6.

[0021] As a preferred solution, the pass voltage of the power consumption circuit A, the power consumption circuit B and the power consumption circuit C is 4.2V, the resistor R1 is designed to be megaohm, so that the current of the power consumption circuit A is microampere; the resistor R2 is designed to be megaohm, so that the current of the power consumption circuit B is microampere; and the resistor R6 is designed to be megaohm, so that the current of the power consumption circuit C is microampere.

[0022] The present application provides a circuit capable of waking up the Tbox when the low-voltage storage battery of the electric vehicle is in a power shortage state and the power battery is removed, and ensuring that after the Tbox is woken up, there is enough time to judge that the detection line input port is in a floating state and report the state to the platform, so that the manager of the vehicle can obtain the state that the power battery is removed through the platform, and to a certain extent, avoid the safety risk of electric shock. When the power battery is not removed, the power consumption circuit of the entire circuit is in the microampere level, and the power consumption is very low, which can effectively prolong the standby time. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The circuit schematic diagram of the present application. DETAILED DESCRIPTION

[0024] Please refer to Figure 1As shown in the figure, a Tbox disconnection wake-up circuit includes a charging lithium battery BAT, an N-channel field effect tube Q2 for disconnection detection, a P-channel field effect tube Q1 for power supply of a voltage output circuit, a voltage output circuit, a P-channel field effect tube Q4 for wake-up voltage output, the charging lithium battery BAT is installed inside the Tbox, the negative electrode of the charging lithium battery BAT is grounded, the positive electrode is connected to the anode of a diode D1, the cathode of the diode D1 is connected to one end of a resistor R1, the other end of the resistor R1 is connected to the gate of the N-channel field effect tube Q2 together with a detection line input end, the detection line input end is connected to the shell of a power battery of a vehicle, a capacitor C2 and a transient diode TVS2 are connected in parallel between the gate and the source of the N-channel field effect tube Q2, the source of the N-channel field effect tube Q2 is grounded;

[0025] The positive electrode of the charging lithium battery BAT is connected to the source of the P-channel field effect tube Q1, the gate of the P-channel field effect tube Q1 is connected to the drain of the N-channel field effect tube Q2, a capacitor C1, a resistor R2 and a transient diode TVS1 are connected in parallel between the source and the gate of the P-channel field effect tube Q1;

[0026] The drain of the P-channel field effect tube Q1 is connected to one end of a resistor R5 and a capacitor C3, the other end of the resistor R5 and the capacitor C3 are connected together and then connected to one end of a resistor R4, the other end of the resistor R4 is connected to one end of a resistor R3 and the base of an NPN triode Q3, the other end of the resistor R3 is grounded, the emitter of the NPN triode Q3 is grounded;

[0027] The positive electrode of the charging lithium battery BAT is connected to the source of the P-channel field effect tube Q4, a resistor R6 and a capacitor C4 are connected in parallel between the source and the gate of the P-channel field effect tube Q4, the gate of the P-channel field effect tube Q4 is connected to the collector of the NPN triode Q3, and the drain of the P-channel field effect tube Q4 is connected to a wake-up output port.

[0028] A charging lithium battery BAT is installed inside the Tbox, which is normally charged by the low-voltage storage battery of the vehicle, and when the low-voltage storage battery of the vehicle is out of power, the circuit is powered by the charging lithium battery BAT to work.

[0029] The gate of the N-channel field effect tube Q2 is connected to the detection line input port, in the external circuit, the detection line is connected to the shell of the power battery, and when the power battery is not removed, the shell is grounded, so that the detection line input port is also in a grounded state; when the power battery is removed, the shell is separated from the vehicle and not grounded, so that the detection line input port is in a suspended state.

[0030] Capacitors C1, C2 and C4 are used to filter out interference from the power supply or line, and transient diodes TVS1 and TVS2 are used for circuit protection.

[0031] In this embodiment, the voltage output circuit includes P-channel field effect transistor Q4, resistor R6 and capacitor C4.

[0032] In this embodiment, the resistance of resistor R1 is 1MΩ, the resistance of resistor R2 is 500KΩ, the resistance of resistor R3 is 15KΩ, the resistance of resistor R4 is 25KΩ, the resistance of resistor R5 is 1MΩ, the resistance of resistor R6 is 1MΩ; the capacity of capacitor C1 is 0.1uF, the capacity of capacitor C2 is 2.2nF, the capacity of capacitor C3 is 100uF, and the capacity of capacitor C4 is 0.1uF.

[0033] In this embodiment, the resistance of resistor R5 is mega-ohm level, which will not cause a large current to flow through resistor R5 and then through resistor R4. Resistor R5 is used for slow discharge of capacitor C3 without affecting the charging of capacitor C3.

[0034] When the charging of capacitor C3 is completed, there is no large current flowing through resistor R4, so that there is no large current flowing into the base of NPN transistor Q3. NPN transistor Q3 returns to the off state, the gate of P-channel field effect transistor Q4 returns to the high level state, Q4 returns to the off state, and the wake-up output port has no high level output.

[0035] The size of capacitor C3 and resistor R4 determines the conduction duration of NPN transistor Q3. In actual application, the conduction duration of NPN transistor Q3 is adjusted to ensure that Tbox has enough time to judge that the detection line input port is in the suspended state after being woken up, and report the state to the platform.

[0036] A wake-up method of a Tbox disconnection wake-up circuit, comprising the Tbox disconnection wake-up circuit as described above, a charging lithium battery BAT installed in the Tbox, and a detection line input end connected to the shell of a power battery of a vehicle, comprising the following steps:

[0037] When the power battery of the vehicle is not removed, the shell of the power battery is normally grounded, the detection line input port is in the grounded state, the gate of N-channel field effect transistor Q2 is in the grounded state, N-channel field effect transistor Q2 is in the off state, resistor R2 inputs the high level from the positive electrode of the charging lithium battery BAT to the gate of P-channel field effect transistor Q1, since N-channel field effect transistor Q2 is in the off state and the gate of Q1 is in the high level, P-channel field effect transistor Q1 is in the off state, and the drain of Q1 has no voltage output, so that the base of NPN transistor Q3 has no voltage and current, and Q3 is in the off state; resistor R6 inputs the high level from the positive electrode of the charging lithium battery BAT to the gate of P-channel field effect transistor Q4, since NPN transistor Q3 is in the off state and the gate of Q4 is in the high level, P-channel field effect transistor Q4 is in the off state, at this time, the drain of P-channel field effect transistor Q4 has no high level output, i.e. the wake-up output port has no high level output, and the Tbox will not be woken up.

[0038] When the power battery of the vehicle is removed, the shell of the power battery is disconnected from the vehicle and not grounded, so that the detection line input port is in a suspended state. At this time, the high level of the positive electrode of the charging lithium battery BAT is input to the gate of the N-channel field effect tube Q2 through the diode D1 and the resistor R1, the N-channel field effect tube Q2 is turned on, the gate of the P-channel field effect tube Q1 is connected to the ground through the drain of the N-channel field effect tube Q2, so that the P-channel field effect tube Q1 is turned on, the high level from the positive electrode of the charging lithium battery BAT is output to the drain of the P-channel field effect tube Q1 through the source of the P-channel field effect tube Q1, and the high level of the drain of the P-channel field effect tube Q1 is charged to the capacitor C3 through the resistor R4. In the process of charging, current flows through the capacitor C3, the resistor R4 and the base of the NPN triode Q3, so that the NPN triode Q3 is in a conducting state in the process of charging the capacitor C3, the collector of the NPN triode Q3 pulls down the level of the gate of the P-channel field effect tube Q4, so that the P-channel field effect tube Q4 is in a conducting state in the process of charging the capacitor C3, and the high level from the positive electrode of the charging lithium battery BAT is output to the drain of the P-channel field effect tube Q4 through the source of the P-channel field effect tube Q4. The wake-up output port outputs a high level to wake up the Tbox.

[0039] When the power battery is not removed, the power consumption circuit of the entire circuit is in the order of microamperes, the power consumption is very low, and the standby time can be effectively prolonged.

[0040] In the embodiment, in the process of waking up the Tbox, the Tbox detects a high level through the detection line input port, so as to judge that the power battery is removed and disconnected from the vehicle. After the Tbox sends the state that the power battery is removed to the platform, the Tbox enters a sleep state.

[0041] In the embodiment, the platform refers to an operation platform of an enterprise. After the Tbox sends the state that the power battery is removed to the platform, the operation enterprise can know that the power battery is removed.

[0042] In the embodiment, the gate of the N-channel field effect tube Q2 is connected to the detection line input port. In the external circuit, the detection line is connected to the shell of the power battery. When the power battery is not removed, the shell is grounded, so that the detection line input port is also in a grounded state. When the power battery is removed, the shell is disconnected from the vehicle and not grounded, so that the detection line input port is in a suspended state.

[0043] In the embodiment, when the power battery of the vehicle is not removed, the whole circuit consumes the electric energy of the charged lithium battery BAT, and the main power consumption circuit A is a circuit connected through the diode D1, the resistor R1 and the ground of the power battery shell; the power consumption circuit B is a circuit for maintaining the P-channel field effect transistor Q1 in the cut-off state through the resistor R2; and the power consumption circuit C is a circuit for maintaining the P-channel field effect transistor Q4 in the cut-off state through the resistor R6.

[0044] In the embodiment, the pass voltage of the power consumption circuit A, the power consumption circuit B and the power consumption circuit C is 4.2V, the resistor R1 is designed as a mega-ohm level, so that the current of the power consumption circuit A is in a micro-ampere level; the resistor R2 is designed as a mega-ohm level, so that the current of the power consumption circuit B is in a micro-ampere level; and the resistor R6 is designed as a mega-ohm level, so that the current of the power consumption circuit C is in a micro-ampere level.

[0045] Through the above design, when the power battery is not removed, the power consumption currents of all the power consumption circuits are in a micro-ampere level, the power consumption of the circuit is extremely low, and the standby time can be effectively prolonged.

[0046] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, although the present application is described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can still be modified or equivalent replaced by the person skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A Tbox disconnection wake-up circuit comprising a rechargeable lithium battery BAT, an N-channel field effect transistor Q2 for disconnection detection, a P-channel field effect transistor Q1 for powering a voltage output circuit, a voltage output circuit, a P-channel field effect transistor Q4 for wake-up voltage output, characterized in that: The charging lithium battery BAT is installed inside the Tbox, the negative electrode of the charging lithium battery BAT is grounded, the positive electrode is connected to the anode of the diode D1, the cathode of the diode D1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the gate of the N-channel field effect transistor Q2 together with the detection line input end, the detection line input end is connected to the shell of the power battery of the vehicle, the capacitor C2 and the transient diode TVS2 are connected in parallel between the gate and the source of the N-channel field effect transistor Q2, and the source of the N-channel field effect transistor Q2 is grounded; The positive electrode of the charging lithium battery BAT is connected to the source of the P-channel field effect transistor Q1, the gate of the P-channel field effect transistor Q1 is connected to the drain of the N-channel field effect transistor Q2, and the capacitor C1, the resistor R2 and the transient diode TVS1 are connected in parallel between the source and the gate of the P-channel field effect transistor Q1; The drain of the P-channel field effect transistor Q1 is connected to one end of the resistor R5 and the capacitor C3, the other end of the resistor R5 and the capacitor C3 are connected together and connected to one end of the resistor R4, the other end of the resistor R4 is connected to one end of the resistor R3 and the base of the NPN triode Q3, the other end of the resistor R3 is grounded, and the emitter of the NPN triode Q3 is grounded; The positive electrode of the charging lithium battery BAT is connected to the source of the P-channel field effect transistor Q4, the resistor R6 and the capacitor C4 are connected in parallel between the source and the gate of the P-channel field effect transistor Q4, the gate of the P-channel field effect transistor Q4 is connected to the collector of the NPN triode Q3, and the drain of the P-channel field effect transistor Q4 is connected to the wake-up output port.

2. The Tbox disconnection wake-up circuit according to claim 1, characterized in that: The voltage output circuit comprises the P-channel field effect transistor Q4, the resistor R6 and the capacitor C4.

3. The Tbox disconnection wake-up circuit according to claim 1, characterized in that: The resistance value of the resistor R1 is 1MΩ, the resistance value of the resistor R2 is 500KΩ, the resistance value of the resistor R3 is 15KΩ, the resistance value of the resistor R4 is 25KΩ, the resistance value of the resistor R5 is 1MΩ, the resistance value of the resistor R6 is 1MΩ, the capacitance of the capacitor C1 is 0.1uF, the capacitance of the capacitor C2 is 2.2nF, the capacitance of the capacitor C3 is 100uF, and the capacitance of the capacitor C4 is 0.1uF.

4. The Tbox disconnection wake-up circuit according to claim 3, characterized in that: The resistor R5 is a mega-ohm resistor, and the resistor R5 is used for slowly discharging the capacitor C3 without affecting the charging of the capacitor C3.

5. A wake-up method of a Tbox disconnection wake-up circuit, comprising the Tbox disconnection wake-up circuit according to any one of claims 1 to 4, a charging lithium battery BAT installed inside the Tbox, and a detection line input end connected to a shell of a power battery of a vehicle, characterized in that, The method comprises the following steps: When the power battery of the vehicle is not removed, the shell of the power battery is normally grounded, the detection line input port is in a grounded state, the gate of the N-channel field effect tube Q2 is in a grounded state, the N-channel field effect tube Q2 is in an off state, the high level from the positive pole of the charging lithium battery BAT is input to the gate of the P-channel field effect tube Q1 through the resistor R2, the gate of Q1 is in a high level due to the off state of the N-channel field effect tube Q2, the P-channel field effect tube Q1 is in an off state, and the drain of Q1 has no voltage output, so that the base of the NPN triode Q3 has no voltage current, and Q3 is in an off state; the high level from the positive pole of the charging lithium battery BAT is input to the gate of the P-channel field effect tube Q4 through the resistor R6, the gate of Q4 is in a high level due to the off state of the NPN triode Q3, the P-channel field effect tube Q4 is in an off state, at this time, the drain of the P-channel field effect tube Q4 has no high level output, that is, the wake-up output port has no high level output, and the Tbox cannot be woken up. When the power battery of the vehicle is removed, the shell of the power battery is separated from the vehicle and not grounded, so that the detection line input port is in a floating state, at this time, the high level from the positive pole of the charging lithium battery BAT is input to the gate of the N-channel field effect tube Q2 through the diode D1 and the resistor R1, the N-channel field effect tube Q2 is turned on, the gate of the P-channel field effect tube Q1 is connected to the ground through the drain of the N-channel field effect tube Q2, so that the P-channel field effect tube Q1 is turned on, the high level from the positive pole of the charging lithium battery BAT is output to the drain of the P-channel field effect tube Q1 through the source of the P-channel field effect tube Q1, the high level of the drain of the P-channel field effect tube Q1 charges the capacitor C3 through the resistor R4, in the charging process, the current flows through the capacitor C3, the resistor R4 and the base of the NPN triode Q3, so that the NPN triode Q3 is in a conducting state in the charging process of the capacitor C3, the collector of the NPN triode Q3 pulls down the level of the gate of the P-channel field effect tube Q4, so that the P-channel field effect tube Q4 is in a conducting state in the charging process of the capacitor C3, the high level from the positive pole of the charging lithium battery BAT is output to the drain of the P-channel field effect tube Q4 through the source of the P-channel field effect tube Q4, the wake-up output port outputs a high level to wake up the Tbox.

6. The wake-up method of claim 5, wherein: In the process of waking up the Tbox, the Tbox detects the high level through the detection line input port, so as to judge that the power battery is removed and separated from the vehicle, and the Tbox enters a sleep state after sending the state that the power battery is removed to the platform.

7. The wake-up method of claim 6, wherein: The platform refers to the operation platform of an enterprise, and the operation enterprise can know that the power battery is removed after the Tbox sends the state that the power battery is removed to the platform.

8. The wake-up method of claim 5, wherein: The gate of the N-channel field effect tube Q2 is connected to the detection line input port, in the external circuit, the detection line is connected to the shell of the power battery, when the power battery is not removed, the shell is grounded, so that the detection line input port is also in a grounded state; when the power battery is removed, the shell is separated from the vehicle and not grounded, so that the detection line input port is in a floating state.

9. The wake-up method of claim 5, wherein: When the power battery of the vehicle is not removed, the entire circuit consumes the electric energy of the charged lithium battery BAT, and the main power consumption circuit A is a circuit connected through the diode D1, the resistor R1 and the ground of the power battery shell; the power consumption circuit B is a circuit for maintaining the P-channel field effect transistor Q1 in the off state through the R2; and the power consumption circuit C is a circuit for maintaining the P-channel field effect transistor Q4 in the off state through the resistor R6.

10. The wake-up method of claim 5, wherein: The pass voltage of the power consumption circuit A, the power consumption circuit B and the power consumption circuit C is 4.2V, the resistor R1 is designed as a megaohm level, so that the current of the power consumption circuit A is in a microampere level; the resistor R2 is designed as a megaohm level, so that the current of the power consumption circuit B is in a microampere level; and the resistor R6 is designed as a megaohm level, so that the current of the power consumption circuit C is in a microampere level.

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