An AC charging CC signal detection circuit with a wake-up function

Abstract

The present invention discloses an AC charging CC signal detection circuit with a wake-up function, which includes a first power supply module; the input end of the first power supply module is connected to the constant power supply of 12V, and the output end is connected to the first input end of the wake-up output module; a wake-up input module, whose second input end is connected to the CC signal end of the AC charging interface, and whose output end WKP is connected to the second input end of the wake-up output module; a wake-up output module, whose third input end is connected to the output end OFF of the BMS main control chip, and the output end EN is connected to the input end of the second power supply module; a sampling module, whose first input end is connected to the output end of the second power supply module, the second input end is connected to the CC signal end of the existing AC charging interface socket, and its output end VTCC is connected to the second input end of the BMS main control chip; the first input end of the BMS main control chip is connected to the output end of the second power supply module. The present invention can simultaneously implement the detection function of the interface connection state and the wake-up function of the BMS.

Description

Technical Field

[0001] The present invention relates to the technical field of battery management, and particularly to an alternating current charging CC signal detection circuit with a wake-up function. Background Art

[0002] A battery management system (Battery Management System, hereinafter referred to as BMS) is a battery protection device and also a bridge between the battery and the load terminal. It provides protection functions such as overcharge, over-discharge, and over-temperature for the battery according to the actual usage status of the battery monitored online, ensuring the safe use of the battery. The battery management system BMS is widely used in many fields such as electric vehicles, communication base stations, and robots.

[0003] Taking electric vehicles as an example, according to the requirements of the new national standard GB / T18487.1-2015 (General Requirements for Electric Vehicle Conductive Charging System Part 1), when charging the on-vehicle power battery system by means of alternating current charging, the on-vehicle monitoring device or BMS needs to determine whether the interface is fully connected through the charging connection confirmation terminal CC in the alternating current charging interface. Only when it is in the fully connected state can charging be allowed to avoid the situation of starting charging when the interface is not fully connected, ensuring personal safety.

[0004] In the existing technical solutions, although some solutions can detect the signal status of the charging connection confirmation terminal CC and can determine whether the interface is fully connected, they cannot wake up the BMS through the charging connection confirmation terminal CC and can only wake up the BMS through other ports; while some solutions have the wake-up function, but when charging is completed and the charging gun is not unplugged, they cannot make the BMS enter the sleep state, causing the BMS to continuously consume the power of the on-vehicle storage battery or the power battery system, thus affecting the normal use of the vehicle.

[0005] Therefore, there is an urgent need to develop an alternating current charging CC signal detection circuit with a wake-up function, which can not only detect whether the interface is fully connected, but also wake up the BMS without affecting the sleep of the BMS. Summary of the Invention

[0006] The purpose of the present invention is to provide an alternating current charging CC signal detection circuit with a wake-up function in view of the technical defects existing in the prior art.

[0007] To this end, the present invention provides an alternating current charging CC signal detection circuit with a wake-up function, which includes a first power supply module, a wake-up input module, a wake-up output module, a sampling module, a BMS main control chip, and a second power supply module;

[0008] Among them, the first power supply module, its input terminal is connected to the constant power supply of 12V;

[0009] The first power supply module, whose output terminal is connected to the first input terminal of the wake-up output module, is used to provide a constant power supply of 5V for the wake-up output module;

[0010] The wake-up input module, whose first input terminal is connected to a constant power supply of 12V;

[0011] The wake-up input module, whose second input terminal is connected to the CC signal terminal of the existing AC charging interface socket, is used to receive the charging connection confirmation CC signal from this CC signal terminal;

[0012] The wake-up input module, whose output terminal WKP is connected to the second input terminal of the wake-up output module, is used to output a wake-up signal WKP with a corresponding level state to the wake-up output module according to the state of the CC signal terminal of the AC charging interface socket;

[0013] The wake-up output module, whose first input terminal is connected to the output terminal of the first power supply module, is used to receive the constant power supply of 5V output by the first power supply module;

[0014] The wake-up output module, whose second input terminal is connected to the output terminal WKP of the wake-up input module, is used to receive the wake-up signal WKP sent by the wake-up input module;

[0015] The wake-up output module, whose third input terminal is connected to the output terminal OFF of the BMS main control chip, is used to receive the sleep control signal OFF sent by the BMS main control chip, and according to the state of this signal, correspondingly output an enable signal EN to the second power supply module at its output terminal EN to control the on and off of the second power supply module;

[0016] The wake-up output module, whose output terminal EN is connected to the input terminal of the second power supply module, is used to output an enable signal EN with a corresponding level state to the second power supply module according to the level state of the wake-up signal WKP sent by the wake-up input module, to control whether the second power supply module outputs DC5V to the BMS main control chip, that is, to control the on and off of the second power supply module;

[0017] The sampling module, whose first input terminal is connected to the output terminal of the second power supply module, is used to receive DC5V;

[0018] The sampling module, whose second input terminal is connected to the CC signal terminal of the AC charging interface socket, is used to receive the charging connection confirmation CC signal output by the CC signal terminal of the AC charging interface socket;

[0019] The sampling module, whose output terminal VTCC is connected to the second input terminal of the BMS main control chip, is used to output a sampling signal VTCC of the CC signal;

[0020] The BMS main control chip, whose first input terminal is connected to the output terminal of the second power supply module, is used to receive the DC5V output by the second power supply module;

[0021] A second power supply module, configured to determine whether to output DC5V to the BMS master chip according to the control of the wake-up output module, and wake up the BMS master chip when outputting DC5V;

[0022] A BMS master chip, whose second input terminal is connected to the output terminal VTCC of the sampling module, is configured to receive the sampling signal VTCC output by the output terminal VTCC of the sampling module;

[0023] The BMS master chip is configured to judge the connection state of the CC signal terminal of the AC charging interface socket according to the voltage value of the high potential of the sampling signal VTCC;

[0024] The output terminal OFF of the BMS master chip is connected to the third input terminal of the wake-up output module, and is configured to output a sleep control signal OFF to the wake-up output module.

[0025] Preferably, according to different connection situations of the charging gun, the voltage value of the sampling signal VTCC is as follows:

[0026] 1. When the charging gun is not inserted into the AC charging interface socket, the sampling signal VTCC output by the output terminal VTCC of the sampling module is at a low level;

[0027] 2. When the charging gun is inserted into the AC charging interface socket, the sampling signal VTCC output by the output terminal VTCC of the sampling module changes from a low level to a high level;

[0028] 3. When the charging is completed and the charging gun is not pulled out from the AC charging interface socket, the sampling signal VTCC output by the output terminal VTCC of the sampling module changes from a high level to a low level;

[0029] 4. When the charging gun is pulled out from the AC charging interface socket, the sampling signal VTCC output by the output terminal VTCC of the sampling module remains at a low level unchanged.

[0030] Preferably, the wake-up input module includes: resistors R1 to R7, diodes D1 to D2, and switching tubes Q1 to Q2, where:

[0031] The first pin of resistor R1, as the second input terminal of the wake-up input module, is connected to the constant power supply 12V;

[0032] The first pin of resistor R1 is also connected to the first pin of resistor R4;

[0033] The second pin of resistor R1 is connected to the anode of diode D1;

[0034] The cathode of diode D1, as the second input terminal of the wake-up input module, is connected to the AC charging interface CC signal terminal of the AC charging interface socket;

[0035] The CC signal terminal of the AC charging interface of the AC charging interface socket is also connected to the cathode of diode D2, the first pin of resistor R3, and the gate G of switching transistor Q1 respectively;

[0036] The anode of diode D2 is connected to the first pin of resistor R2;

[0037] The second pin of resistor R2 is connected to terminal V1;

[0038] Terminal V1 is connected to the second pin of resistor R5, the first pin of resistor R6, and the base B of switching transistor Q2 respectively;

[0039] The first pin of resistor R5 is connected to the second pin of resistor R4 and the emitter E of switching transistor Q2 respectively;

[0040] The second pin of resistor R6 is connected to the second pin of resistor R3 and the source S of switching transistor Q1 respectively;

[0041] The drain D of switching transistor Q1 is connected to the ground terminal GND;

[0042] The collector C of switching transistor Q2 is connected to the first pin of resistor R7;

[0043] The second pin of resistor R7 is connected to the ground terminal GND;

[0044] The collector C of switching transistor Q2 serves as the output terminal WKP of the wake-up input module.

[0045] Preferably, the wake-up output module includes: resistors R8 to R21, diodes D3 to D4, capacitors C1 to C3, switching transistors Q3 to Q5, and T flip-flop U1, where:

[0046] The first pin of resistor R21 serves as the first input terminal of the wake-up output module and is connected to the output terminal of the first power supply module for receiving the constant power 5V;

[0047] The second pin of resistor R21 is connected to the emitter E of switching transistor Q5;

[0048] The collector C of switching transistor Q5 is connected to the first pin of resistor R15;

[0049] The base B of switching transistor Q5 is connected to the collector C of switching transistor Q4;

[0050] The base B of switching transistor Q4 is connected to the first pin of resistor R19 and the second pin of resistor R20 respectively;

[0051] The emitter E of switching transistor Q4 is connected to the second pin of resistor R19 and the ground terminal GND respectively;

[0052] The first pin of resistor R20, serving as the second input terminal of the wake-up output module, is connected to the output terminal WKP of the wake-up input module;

[0053] The first pin of resistor R20 is also connected to the first pin of resistor R8;

[0054] The second pin of resistor R15 is connected to the power input terminal VCC of T flip-flop U1;

[0055] The input terminal T of T flip-flop U1 is connected to the TIN terminal;

[0056] The TIN terminal is respectively connected to the second pin of resistor R8, the first pin of capacitor C1, the second pin of resistor R9, and the second pin of resistor R12;

[0057] The clock signal input terminal CP of T flip-flop U1 is respectively connected to the cathode of diode D3, the cathode of diode D4, and the first pin of resistor R11;

[0058] The output terminal Q of T flip-flop U1 is connected to the first pin of resistor R16;

[0059] The second pin of resistor R16, serving as the output terminal of the wake-up output module, is connected to the enable terminal EN;

[0060] The enable terminal EN is connected to the input terminal of the second power module;

[0061] The enable terminal EN is also connected to the first pin of resistor R17;

[0062] The second pin of resistor R17 is connected to the ground terminal GND;

[0063] The anode of diode D3 is connected to the first pin of resistor R18;

[0064] The second pin of resistor R18 is connected to the output terminal OFF of the BMS main control chip;

[0065] The second pin of capacitor C1 is connected to the ground terminal GND;

[0066] The second pin of resistor R11 is connected to the ground terminal GND;

[0067] The anode of diode D4 is connected to the V2 terminal;

[0068] The V2 terminal is respectively connected to the collector C of switch tube Q3 and the first pin of resistor R10;

[0069] The second pin of resistor R10 is respectively connected to the first pin of capacitor C2 and the first pin of resistor R9;

[0070] The second pin of capacitor C2 is connected to the ground terminal GND;

[0071] The second pin of resistor R9 is connected to the TIN terminal;

[0072] The base B of switch transistor Q3 is respectively connected to the first pin of resistor R13 and the first pin of resistor R14;

[0073] The emitter E of switch transistor Q3 is connected to the ground terminal GND;

[0074] The second pin of resistor R14 is connected to the ground terminal GND;

[0075] The second pin of resistor R13 is respectively connected to the first pin of capacitor C3 and the first pin of resistor R12;

[0076] The second pin of resistor R12 is connected to the TIN terminal;

[0077] The second pin of capacitor C3 is grounded.

[0078] Preferably, the T flip - flop U1 is a positive - edge - triggered flip - flop.

[0079] Preferably, the sampling module includes resistors R30 - R33 and diode D20, where:

[0080] The second pin of resistor R30, as the first input terminal of the sampling module, is connected to the output terminal of the 5V power supply module for receiving DC5V;

[0081] The first pin of resistor R30 is connected to the V3 terminal;

[0082] The V3 terminal is respectively connected to the first pin of resistor R31 and the second pin of resistor R33;

[0083] The second pin of resistor R31, as the output terminal VTCC of the sampling module;

[0084] The second pin of resistor R31 is connected to the first pin of resistor R32;

[0085] The second pin of resistor R32 is connected to the ground terminal GND;

[0086] The first pin of resistor R33 is connected to the anode of diode D20;

[0087] The cathode of diode D20, as the second input terminal of the sampling module, is connected to the AC charging interface CC signal terminal of the AC charging interface socket.

[0088] As can be seen from the technical solution provided by the present invention above, compared with the prior art, the present invention provides an AC charging CC signal detection circuit with a wake-up function, which is scientifically designed and can not only detect whether the interface is fully connected, but also wake up the BMS without affecting the BMS sleep. At the same time, the detection function of the interface connection state and the wake-up function of the BMS are realized, which has great significance in production practice.

[0089] For the technical solution of the present invention, the hardware circuit is scientifically designed, and the electronic components are commonly used models, which are easy to select and the component prices are low.

[0090] In addition, due to the low power consumption of the hardware circuit of the technical solution of the present invention, surface-mounted low-power electronic components can be used, so the circuit board occupies a small space, greatly reducing the material cost. Therefore, the technical solution of the present invention has strong practical value and market promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] Figure 1 It is a schematic block diagram of an AC charging CC signal detection circuit with a wake-up function provided by the present invention;

[0092] Figure 2 It is a schematic diagram of the wake-up input module in an AC charging CC signal detection circuit with a wake-up function provided by the present invention;

[0093] Figure 3 It is a schematic diagram of the wake-up output module in an AC charging CC signal detection circuit with a wake-up function provided by the present invention;

[0094] Figure 4 It is a schematic diagram of the sampling module in an AC charging CC signal detection circuit with a wake-up function provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0095] To make the technical means implemented by the present invention easier to understand, the following further details the present application with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, rather than limiting the application. In addition, it should be noted that for the convenience of description, only parts related to the present application are shown in the drawings.

[0096] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will detail the present application with reference to the drawings and embodiments.

[0097] See Figures 1 to 4, the present invention provides an alternating current charging CC signal detection circuit with a wake-up function, including a first power supply module (specifically a 5V constant power supply module) 100, a wake-up input module 200, a wake-up output module 300, a sampling module 400, a BMS main control chip 500, and a second power supply module (specifically a 5V power supply module) 600;

[0098] Among them, for the first power supply module 100, its input terminal is connected to the constant power supply 12V;

[0099] The output terminal of the first power supply module 100 is connected to the first input terminal of the wake-up output module 300, and is used to provide a constant power supply 5V for the wake-up output module 300;

[0100] It should be noted that the input terminal of the first power supply module 100 is connected to the external constant power supply 12V. Among them, the constant power supply 12V is generally an in-vehicle 12V battery or an in-vehicle 12V DC-DC; the constant power supply �V is a continuous 5V DC output and will not stop the 5V output due to the BMS going to sleep.

[0101] For the wake-up input module 200, its first input terminal is connected to the constant power supply 12V;

[0102] The second input terminal of the wake-up input module 200 is connected to the CC signal terminal of the existing alternating current charging interface socket, and is used to receive the charging connection confirmation CC signal from this CC signal terminal;

[0103] The output terminal WKP of the wake-up input module 200 is connected to the second input terminal of the wake-up output module 300, and is used to output a wake-up signal WKP with a corresponding level state to the wake-up output module 300 according to the state of the CC signal terminal of the alternating current charging interface socket;

[0104] It should be noted that the alternating current charging interface and its socket meet the requirements of the new national standard GB / T20234.2-2015 (Connection devices for electric vehicle conductive charging - Part 2 Alternating current charging interface); according to the regulations of the new national standard GB / T18487.1-2015 (Electric vehicle conductive charging system - Part 1 General requirements), the connection method of the alternating current charging interface should conform to the connection method B and connection method C of charging mode 3 and their control principles, and the state of the CC signal terminal of the alternating current charging interface should conform to the regulations on its connection state and resistance value. The present invention divides its connection state into two types:

[0105] 1) Effective resistance state, indicating that the charging gun has been inserted;

[0106] 2) High resistance state, indicating that the charging gun has not been inserted.

[0107] The wake-up output module 300, whose first input terminal is connected to the output terminal of the first power module 100, is used to receive the constant power supply of 5V output by the first power module 100;

[0108] The wake-up output module 300, whose second input terminal is connected to the output terminal WKP of the wake-up input module 200, is used to receive the wake-up signal WKP sent by the wake-up input module 200;

[0109] The wake-up output module 300, whose third input terminal is connected to the output terminal OFF of the BMS main control chip 500, is used to receive the sleep control signal OFF sent by the BMS main control chip 500, and according to the state of this signal, correspondingly output the enable signal EN to the second power module 600 at its output terminal EN, to control the on / off of the second power module 600;

[0110] The wake-up output module 300, whose output terminal EN is connected to the input terminal of the second power module 600, is used to correspondingly output the enable signal EN with the corresponding level state to the second power module 600 according to the level state of the wake-up signal WKP sent by the wake-up input module 200, to control whether the second power module 600 outputs DC5V (direct current 5V) to the BMS main control chip 500, that is, to control the on / off of the second power module 600;

[0111] It should be noted that the DC5V is not a continuous 5V direct current output, and the 5V output will stop due to the BMS sleep.

[0112] The sampling module 400, whose first input terminal is connected to the output terminal of the second power module 600, is used to receive DC5V;

[0113] The sampling module 400, whose second input terminal is connected to the CC signal terminal of the AC charging interface socket, is used to receive the charging connection confirmation CC signal output by the CC signal terminal of the AC charging interface socket;

[0114] The output terminal VTCC of the sampling module 400 is connected to the second input terminal of the BMS main control chip 500, and is used to output the sampling signal VTCC of the CC signal;

[0115] The BMS main control chip 500, whose first input terminal is connected to the output terminal of the second power module 600, is used to receive the DC5V output by the second power module 600;

[0116] The second power module 600 is used to determine whether to output DC5V to the BMS main control chip 500 according to the control of the wake-up output module 300, and when outputting DC5V, wake up the BMS main control chip 500;

[0117] The BMS master control chip 500, whose second input terminal is connected to the output terminal VTCC of the sampling module 400, is used to receive the sampling signal VTCC output from the output terminal VTCC of the sampling module 400;

[0118] The BMS master control chip 500 is used to judge the connection state (disconnected or connected) of the CC signal terminal of the AC charging interface socket according to the voltage value of the high potential of the sampling signal VTCC; Among them, according to different connection situations of the charging gun, the voltage value situations of the sampling signal VTCC are as follows:

[0119] I. When the charging gun is not inserted into the AC charging interface socket, the sampling signal VTCC output from the output terminal VTCC of the sampling module 400 is at a low level;

[0120] II. When the charging gun is inserted into the AC charging interface socket, the sampling signal VTCC output from the output terminal VTCC of the sampling module 400 changes from a low level to a high level;

[0121] III. When the charging is over and the charging gun is not pulled out from the AC charging interface socket, the sampling signal VTCC output from the output terminal VTCC of the sampling module 400 changes from a high level to a low level;

[0122] IV. When the charging gun is pulled out from the AC charging interface socket, the sampling signal VTCC output from the output terminal VTCC of the sampling module 400 remains at a low level unchanged.

[0123] The output terminal OFF of the BMS master control chip 500 is connected to the third input terminal of the wake-up output module 300, and is used to output a sleep control signal OFF to the wake-up output module 300.

[0124] For the present invention, it should be noted that the first power supply module (specifically the 5V constant power supply module) 100 and the second power supply module (specifically the 5V power supply module) 600 are power supply circuits commonly used in existing BMS technical solutions. Those skilled in the art can easily obtain and apply them without any innovation. The technical solution of this power supply circuit does not belong to the technical solution of the present invention, so no specific explanation is given here.

[0125] In terms of specific implementation, it should be noted that the first power supply module (specifically the 5V constant power supply module) 100 and the second power supply module (specifically the 5V power supply module) 600 can use currently commonly used low-power, step-down DC power supply circuits or integrated power supply modules, such as linear LDO, switching power supplies, etc. The DC power supply circuit or integrated power supply module should have a power output enable function to control the on and off of the power output.

[0126] It should be noted that the charging strategy already stored in the BMS master chip 500 does not belong to the technical solution of the present invention. The present invention only utilizes the sleep control signal OFF output by it according to the charging strategy.

[0127] To more clearly understand the technical solution of the present invention, the working principle of the present invention is described below. Specifically as follows:

[0128] 1. When the charging gun is not inserted into the socket of the existing AC charging interface, the CC signal terminal of the AC charging interface of the AC charging gun socket is in a high impedance state, and the wake-up signal WKP output by the output terminal WKP of the wake-up input module 200 is at a low level, making the enable signal EN output by the output terminal EN of the wake-up output module 300 also at a low level, so that the second power supply module 600 does not output DC5V. Therefore, the BMS master chip 500 cannot be woken up, and the sleep control signal OFF output by its output terminal OFF is at a low level.

[0129] Since the 5V power supply module 600 does not output DC5V, the sampling signal VTCC output by the output terminal VTCC of the sampling module 400 is at a low level.

[0130] 2. When the charging gun is inserted into the socket of the existing AC charging interface, the CC signal terminal of the AC charging interface of the AC charging gun socket is in an effective resistance state, and the wake-up signal WKP output by the output terminal WKP of the wake-up input module 200 changes from a low level to a high level, making the enable signal EN output by the output terminal EN of the wake-up output module 300 also change from a low level to a high level, so that the second power supply module 600 outputs DC5V and wakes up the BMS master chip 500; before the charging ends, the sleep control signal OFF output by the output terminal OFF of the BMS master chip 500 always remains at a low level state.

[0131] Since DC5V is connected and the CC signal terminal of the AC charging interface becomes an effective resistance state, the sampling signal VTCC output by the output terminal VTCC of the sampling module 400 also changes from a low level to a high level, and the voltage amplitude of its high level changes following the resistance value of the effective resistance.

[0132] 3. When the charging ends and the charging gun is not pulled out from the socket of the existing AC charging interface, the CC signal terminal of the AC charging interface remains in an effective resistance state, and the wake-up signal WKP output by the output terminal WKP of the wake-up input module 200 remains at a high level unchanged;

[0133] According to the charging strategy, when charging ends, the sleep control signal OFF output from the OFF output terminal of the BMS main control chip 500 changes from a low level to a positive pulse signal, causing the enable signal EN output from the EN output terminal of the wake-up output module 300 to change from a high level to a low level. Then, the second power module 600 stops outputting DC5V. Therefore, the BMS main control chip 500 enters the sleep state due to power-off, and the sleep control signal OFF output from its OFF output terminal also becomes a low level, thereby causing the EN output terminal of the wake-up output module 300 to maintain a low level state, and further locking the BMS main control chip in the sleep state.

[0134] At this time, since the second power module 600 does not output DC5V, the sampling signal VTCC output from the VTCC output terminal of the sampling module 400 changes from a high level to a low level.

[0135] IV. When the charging gun is unplugged from the socket of the existing AC charging interface, the CC signal terminal of the AC charging interface becomes a high impedance state, the wake-up signal WKP output from the WKP output terminal of the wake-up input module 200 changes from a high level to a low level, and the enable signal EN output from the EN output terminal of the wake-up output module 300 still maintains a low level, causing the second power module 600 not to output DC5V, locking the BMS main control chip 500 in the sleep state.

[0136] Since the second power module 600 does not output DC5V, the sampling signal VTCC output from the VTCC output terminal of the sampling module 400 remains at a low level unchanged.

[0137] In the present invention, in terms of specific implementation, refer to Figure 2 As shown, the wake-up input module 200 includes: resistors R1 to R7, diodes D1 to D2, and switching transistors Q1 to Q2, where:

[0138] The first pin of resistor R1, as the second input terminal of the wake-up input module 200, is connected to the constant power supply of 12V;

[0139] The first pin of resistor R1 is also connected to the first pin of resistor R4;

[0140] The second pin of resistor R1 is connected to the anode of diode D1;

[0141] The cathode of diode D1, as the second input terminal of the wake-up input module 200, is connected to the CC signal terminal of the AC charging interface socket of the AC charging interface;

[0142] The CC signal terminal of the AC charging interface socket of the AC charging interface is also respectively connected to the cathode of diode D2, the first pin of resistor R3, and the gate G of switching transistor Q1;

[0143] The anode of diode D2 is connected to the first pin of resistor R2;

[0144] The second pin of resistor R2 is connected to terminal V1 (a wiring terminal);

[0145] Terminal V1 is respectively connected to the second pin of resistor R5, the first pin of resistor R6, and the base B of switching transistor Q2;

[0146] The first pin of resistor R5 is respectively connected to the second pin of resistor R4 and the emitter E of switching transistor Q2;

[0147] The second pin of resistor R6 is respectively connected to the second pin of resistor R3 and the source S of switching transistor Q1;

[0148] The drain D of switching transistor Q1 is connected to the ground terminal GND;

[0149] The collector C of switching transistor Q2 is connected to the first pin of resistor R7;

[0150] The second pin of resistor R7 is connected to the ground terminal GND;

[0151] The collector C of switching transistor Q2 serves as the output terminal WKP of the wake-up input module 200.

[0152] In the present invention, specifically, the working principle of the wake-up input module 200 is as follows:

[0153] 1. When the charging gun is not inserted into the AC charging interface socket, the AC charging interface CC signal terminal of the AC charging interface socket is in a high-impedance state, the switching transistor Q2 is turned off, the CC signal terminal and the V1 terminal are at the same potential, the resistor R3 makes the gate-source of the switching transistor Q1 at the same potential, and thus the switching transistor Q1 is turned off. The output terminal WKP of the wake-up input module 200 is grounded by the resistor R7 and is at a low level; the low-level WKP signal cannot wake up the BMS main control chip 500.

[0154] 2. When the charging gun is inserted into the AC charging interface socket, the AC charging interface CC signal terminal is in an effective resistance state RCC. Under the voltage division of the resistor RCC and the resistor R1, the AC charging interface CC signal terminal becomes a low potential, so that the diode D2, the switching transistor Q1, and the switching transistor Q2 change from off to on. At this time, the voltage of the V1 terminal is greater than the voltage of the CC signal terminal, and the voltage difference between these two ends needs to be greater than the turn-on threshold voltage of the switching transistor Q2; the constant power supply of 12V is divided by the resistor R4, the switching transistor Q2, and the resistor R7, so that the wake-up signal terminal WKP changes from a low level to a high level; only when the WKP signal state is at a high level can the BMS main control chip 500 be woken up.

[0155] After the switch transistor Q1 is turned on, due to the voltage division effect of the resistor R4, the switch transistor Q2, and the resistor R6, the voltage at the V1 terminal decreases and becomes lower than the voltage at the CC signal terminal. Therefore, the diode D2 is turned off.

[0156] III. When the charging gun is unplugged from the AC charging interface socket, the AC charging interface CC signal terminal of the AC charging interface socket changes from the effective resistance state RCC to the high impedance state. The switch transistors Q1 and Q2 change from being turned on to being turned off, causing the wake-up signal terminal WKP to change from a high level to a low level.

[0157] In the present invention, in terms of specific implementation, refer to Figure 3 As shown, the wake-up output module 300 includes: resistors R8 to R21, diodes D3 to D4, capacitors C1 to C3, switch transistors Q3 to Q5, and a T flip-flop U1, where:

[0158] The first pin of the resistor R21, as the first input terminal of the wake-up output module 300, is connected to the output terminal of the first power module 100 for receiving the constant power supply of 5V.

[0159] The second pin of the resistor R21 is connected to the emitter E of the switch transistor Q5.

[0160] The collector C of the switch transistor Q5 is connected to the first pin of the resistor R15.

[0161] The base B of the switch transistor Q5 is connected to the collector C of the switch transistor Q4.

[0162] The base B of the switch transistor Q4 is respectively connected to the first pin of the resistor R19 and the second pin of the resistor R20.

[0163] The emitter E of the switch transistor Q4 is respectively connected to the second pin of the resistor R19 and the ground terminal GND.

[0164] The first pin of the resistor R20, as the second input terminal of the wake-up output module 300, is connected to the output terminal WKP of the wake-up input module 200.

[0165] The first pin of the resistor R20 is also connected to the first pin of the resistor R8.

[0166] The second pin of the resistor R15 is connected to the power supply input terminal VCC of the T flip-flop U1.

[0167] The input terminal T of the T flip-flop U1 is connected to the TIN terminal (a wiring terminal).

[0168] The TIN terminal is respectively connected to the second pin of the resistor R8, the first pin of the capacitor C1, the second pin of the resistor R9, and the second pin of the resistor R12.

[0169] The clock signal input terminal CP of the T flip - flop U1 is respectively connected to the cathode of the diode D3, the cathode of the diode D4, and the first pin of the resistor R11;

[0170] The output terminal Q of the T flip - flop U1 is connected to the first pin of the resistor R16;

[0171] The second pin of the resistor R16, as the output terminal of the wake - up output module 300, is connected to the enable terminal EN;

[0172] The enable terminal EN is connected to the input terminal of the second power supply module 600;

[0173] The enable terminal EN is also connected to the first pin of the resistor R17;

[0174] The second pin of the resistor R17 is connected to the ground terminal GND;

[0175] The anode of the diode D3 is connected to the first pin of the resistor R18;

[0176] The second pin of the resistor R18 is connected to the output terminal OFF of the BMS main control chip 500;

[0177] The second pin of the capacitor C1 is connected to the ground terminal GND;

[0178] The second pin of the resistor R11 is connected to the ground terminal GND;

[0179] The anode of the diode D4 is connected to the V2 terminal;

[0180] The V2 terminal is respectively connected to the collector C of the switching transistor Q3 and the first pin of the resistor R10;

[0181] The second pin of the resistor R10 is respectively connected to the first pin of the capacitor C2 and the first pin of the resistor R9;

[0182] The second pin of the capacitor C2 is connected to the ground terminal GND;

[0183] The second pin of the resistor R9 is connected to the TIN terminal;

[0184] The base B of the switching transistor Q3 is respectively connected to the first pin of the resistor R13 and the first pin of the resistor R14;

[0185] The emitter E of the switching transistor Q3 is connected to the ground terminal GND;

[0186] The second pin of the resistor R14 is connected to the ground terminal GND;

[0187] The second pin of the resistor R13 is respectively connected to the first pin of the capacitor C3 and the first pin of the resistor R12;

[0188] The second pin of resistor R12 is connected to the TIN terminal;

[0189] The second pin of capacitor C3 is grounded.

[0190] It should be noted that the T flip - flop U1 is a positive - edge - triggered flip - flop.

[0191] In the present invention, specifically, the working principle of the wake - up output module 300 is as follows:

[0192] 1. When no charging gun is inserted into the AC charging interface socket, the AC charging interface CC signal terminal of the AC charging interface socket is in a high - impedance state, and the wake - up signal WKP output by the wake - up input module 200 is at a low level, causing the switching transistors Q4 and Q5 to be cut off, so that the T flip - flop U1 is not connected to the normal power supply of 5V. Then, its output terminal Q and the enable terminal EN of the wake - up output module are both at a low level, causing the second power supply module 600 not to output DC5V and unable to wake up the BMS main control chip 500. Therefore, the sleep control signal OFF output by the output terminal OFF of the BMS main control chip 500 is at a low level, thereby causing the diode D3 to be cut off;

[0193] The low - level wake - up signal WKP makes the TIN terminal also at a low level, so the switching transistor Q3 and the diode D4 are both cut off, thereby making the V2 terminal also at a low level;

[0194] The resistor R11 pulls down the clock signal input terminal CP of the T flip - flop U1 to a low level.

[0195] 2. When a charging gun is inserted into the AC charging interface socket, the AC charging interface CC signal terminal of the AC charging interface socket changes from a high - impedance state to an effective resistance state RCC, causing the wake - up signal WKP output by the wake - up input module 200 to change from a low level to a high level, causing the switching transistors Q4 and Q5 to change from cut - off to conducting, making the T flip - flop U1 connected to the normal power supply of 5V. The output terminal Q of the T flip - flop U1 is pulled down to a low level by the resistor R17;

[0196] After the high - level wake - up signal WKP passes through the delay of the resistor R8 and the capacitor C1, the TIN terminal changes from a low level to a high level. First, the input terminal T of the T flip - flop U1 changes from a low level to a high level. Then, after the delay of the resistor R9 and the capacitor C2, the V2 terminal changes from a low level to a high level, causing the diode D4 to change from cut - off to conducting, outputting a positive - edge - triggered signal to the clock signal input terminal CP of the T flip - flop U1, causing the output terminal Q of the T flip - flop U1 to change from a low level to a high level, and the enable terminal EN of the wake - up output module also changes from a low level to a high level, thereby causing the second power supply module 600 to output DC5V and wake up the BMS main control chip 500;

[0197] After the BMS master control chip 500 is awakened, the sleep control signal OFF output by its output terminal OFF still remains at a low level unchanged, causing the diode D3 to continue to remain cut off;

[0198] After the high-level signal at the TIN terminal passes through the delay of the resistor R12 and the capacitor C3, the switching transistor Q3 changes from cut off to conducting, causing the V2 terminal to change from a high level to a low level and equal to the saturation conduction voltage drop of the switching transistor Q3; at this time, the voltage at the V2 terminal is not sufficient to make the diode D4 conduct, so the diode D4 changes from conducting to cut off, causing the clock signal input terminal CP of the T flip-flop U1 to change from a high level to a low level. This level change has no effect on the signal state of the output terminal Q of the T flip-flop U1, and the output terminal Q of the T flip-flop U1 continues to remain at a high level unchanged, then the enable terminal EN of the wake-up output module also remains at a high level unchanged, so that the BMS master control chip 500 is always in the wake-up state.

[0199] Since both the diodes D3 and D4 are cut off, the resistor R11 pulls down the clock signal input terminal CP of the T flip-flop U1 to a low level.

[0200] It should be noted that the delay time of the resistor R9 and the capacitor C2 should be greater than the delay time of the resistor R8 and the capacitor C1.

[0201] It should be noted that the delay time of the resistor R12 and the capacitor C3 should be greater than the delay time of the resistor R9 and the capacitor C2, and the delay time of the resistor R12 and the capacitor C3 should enable the T flip-flop U1 to perform a normal state flip.

[0202] III. When the charging is completed and the charging gun is not unplugged from the AC charging interface socket, the AC charging interface CC signal terminal of the AC charging interface socket remains in the effective resistance state RCC, the wake-up signal WKP output by the wake-up input module 200 remains at a high level unchanged, then the input terminal T and the output terminal Q of the T flip-flop U1 both remain at a high level unchanged, and the BMS master control chip 500 is still in the wake-up state;

[0203] According to the charging strategy, when the charging is completed, the output terminal OFF of the BMS master control chip 500 changes from a low level to a high level, causing the diode D3 to change from cut off to conducting, and then outputting a positive edge trigger signal to the clock signal input terminal CP of the T flip-flop U1. Then the output terminal Q of the T flip-flop U1 changes from a high level to a low level, and the enable terminal EN of the wake-up output module also changes from a high level to a low level, causing the second power supply module 600 not to output DC5V anymore, so that the BMS master control chip 500 changes from the wake-up state to the sleep state, and its output terminal OFF changes from a high level to a low level, then the diode D3 changes from conducting to cut off;

[0204] Meanwhile, since the wake-up signal WKP output by the wake-up input module 200 is at a high level, the switching transistor Q3 and the diode D4 continue to be in a cut-off state. Then, the resistor R11 continues to keep the clock signal input terminal CP of the T flip-flop U1 at a low level. Therefore, the output terminal Q of the T flip-flop U1 remains at a low level unchanged, and the enable terminal EN of the wake-up output module also remains at a low level unchanged, causing the second power supply module 600 not to output DC5V, locking the BMS main control chip 500 in a sleep state.

[0205] IV. When the charging gun is unplugged from the AC charging interface socket, the AC charging interface CC signal terminal of the AC charging interface socket changes from the effective resistance state RCC to a high impedance state, and the wake-up signal WKP output by the output terminal WKP of the wake-up input module 200 changes from a high level to a low level. Then, the switching transistors Q4 and Q5 change from a conducting state to a cut-off state, causing the T flip-flop U1 not to be connected to the normal power supply 5V anymore, and its output terminal Q is pulled low to a low level by the resistor R17, causing the second power supply module 600 not to output DC5V anymore. As a result, the BMS main control chip 500 changes from a wake-up state to a sleep state, and its output terminal OFF is at a low level, causing the diode D3 to remain in a cut-off state;

[0206] The low-level wake-up signal WKP causes the switching transistor Q3 to change from a conducting state to a cut-off state. At this time, the diode D4 continues to be in a cut-off state, and the resistor R11 locks the clock signal input terminal CP of the T flip-flop U1 at a low level.

[0207] In the present invention, in terms of specific implementation, refer to Figure 4 As shown, the sampling module 400 includes resistors R30 to R33 and a diode D20, where:

[0208] The second pin of the resistor R30, as the first input terminal of the sampling module 400, is connected to the output terminal of the 5V power supply module 600 for receiving DC5V;

[0209] The first pin of the resistor R30 is connected to the V3 terminal;

[0210] The V3 terminal is respectively connected to the first pin of the resistor R31 and the second pin of the resistor R33;

[0211] The second pin of the resistor R31, as the output terminal VTCC of the sampling module 400;

[0212] The second pin of the resistor R31 is connected to the first pin of the resistor R32;

[0213] The second pin of the resistor R32 is connected to the ground terminal GND;

[0214] The first pin of the resistor R33 is connected to the anode of the diode D20;

[0215] The cathode of diode D20, as the second input terminal of the sampling module 400, is connected to the AC charging interface CC signal terminal of the AC charging interface socket.

[0216] In the present invention, specifically, the working principle of the sampling module 400 is as follows:

[0217] I. When no charging gun is inserted into the AC charging interface socket, the AC charging interface CC signal terminal of the AC charging interface socket is in a high-impedance state, and the wake-up signal WKP output by the wake-up input module 200 is at a low level, causing the second power supply module 600 not to output DC5V. Therefore, the sampling signal VTCC at the output terminal VTCC of the sampling module 400 is pulled down to 0V by the resistor R22.

[0218] II. When a charging gun is inserted into the AC charging interface socket, the AC charging interface CC signal terminal of the AC charging interface socket changes from a high-impedance state to an effective resistance state RCC, causing the wake-up signal WKP output by the wake-up input module 200 to change from a low level to a high level. Then, the second power supply module 600 outputs DC5V;

[0219] The effective resistance RCC of the AC charging interface CC signal terminal is connected in series with the resistor R33 and then in parallel with the resistors R31 and R32, thereby making the voltage at the V3 terminal less than DC5V. After being divided by the resistors R31 and R32, the sampling signal VTCC changes from 0V to a high potential, and the voltage value of this high potential will change due to the change in the resistance value of the effective resistance RCC.

[0220] It should be noted that in the charging strategy, the BMS main control chip 500 can judge the connection state (disconnected or connected) of the AC charging interface according to the voltage value of the high potential of the sampling signal VTCC, and can also judge the charging cable capacity, including 10A, 16A, 32A, and 64A. The judgment basis must conform to the judgment standard formulated by the new charging national standard.

[0221] III. When charging is completed and the charging gun is not removed from the AC charging interface socket, the AC charging interface CC signal terminal of the AC charging interface socket remains in the effective resistance state RCC, and the wake-up signal WKP output by the wake-up input module 200 remains at a high level;

[0222] Under this condition, if the second power supply module 600 outputs DC5V, then the sampling signal VTCC is at a high potential; if the second power supply module 600 does not output DC5V, then the sampling signal VTCC is 0V.

[0223] IV. When the charging gun is unplugged from the AC charging interface socket, the CC signal terminal of the AC charging interface of the AC charging interface socket changes from the effective resistance state RCC to the high impedance state, and the wake-up signal WKP output by the wake-up input module 200 changes from the high level to the low level.

[0224] As a result, the second power module 600 has no DC5V output, and the resistor R32 pulls down the sampling signal VTCC to 0V.

[0225] In the present invention, specifically, it should be noted that the BMS main control chip 500 can adopt the brands, series and models that are currently commonly used, such as the MC9S12 series of NXP, the TC265 of the TC2 series of Infineon, etc. The model of the BMS main control chip 500 is not within the protection scope of the present invention.

[0226] Based on the above technical solutions, according to the technical solution of the present invention, the AC charging CC signal can wake up the BMS main control chip, and after the BMS main control chip is woken up, it can monitor the resistance value of the CC port in real time to judge the capacity of the charging cable.

[0227] To sum up, compared with the prior art, an AC charging CC signal detection circuit with a wake-up function provided by the present invention is scientifically designed, which can not only detect whether the interface is fully connected, but also wake up the BMS without affecting the BMS sleep. At the same time, the detection function of the interface connection state and the wake-up function of the BMS are realized, which has great practical significance in production.

[0228] For the technical solution of the present invention, the hardware circuit is scientifically designed, and the electronic components are commonly used models, which are easy to select and the prices of the components are low.

[0229] In addition, since the hardware circuit of the technical solution of the present invention has low power consumption, surface-mounted low-power electronic components can be used, so the circuit board occupies a small space, greatly reducing the material cost. Therefore, the technical solution of the present invention has strong practical value and market promotion value.

[0230] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An AC charging CC signal detection circuit with a wake-up function, characterized in that: The invention comprises a first power supply module (100), a wake-up input module (200), a wake-up output module (300), a sampling module (400), a BMS main control chip (500) and a second power supply module (600); wherein, the first power supply module (100) has an input end connected to a normal power of 12V; the first power supply module (100) has an output end connected to a first input end of the wake-up output module (300) and is used to provide a normal power of 5V to the wake-up output module (300); the wake-up input module (200) has a first input end connected to a normal power of 12V; the wake-up input module (200) has a second input end connected to a CC signal end of an existing AC charging interface socket and is used to receive a charging connection confirmation CC from the CC signal end. signal; a wake-up input module (200), whose output terminal WKP is connected to the second input terminal of the wake-up output module (300), and is used to output a wake-up signal WKP of a corresponding level state to the wake-up output module (300) according to the state of the CC signal terminal of the AC charging interface socket; a wake-up output module (300), whose first input terminal is connected to the output terminal of the first power module (100), and is used to receive the normal power 5V output by the first power module (100); a wake-up output module (300), whose second input terminal is connected to the output terminal WKP of the wake-up input module (200), and is used to receive the wake-up signal WKP sent by the wake-up input module (200); a wake-up output module (300), whose third input terminal is connected to B The output terminal OFF of the MS main control chip (500) is used to receive the sleep control signal OFF sent by the BMS main control chip (500), and output an enable signal EN to the second power module (600) at its output terminal EN according to the state of the signal, thereby controlling the on and off of the second power module (600); the wake-up output module (300), whose output terminal EN is connected to the input terminal of the second power module (600), is used to output an enable signal EN of a corresponding level state to the second power module (600) according to the level state of the wake-up signal WKP sent by the wake-up input module (200), thereby controlling whether the second power module (600) outputs DC5V to the BMS main control chip (500), i.e., controlling The second power supply module (600) is turned on and off; the sampling module (400), whose first input end is connected to the output end of the second power supply module (600) and is used to receive DC5V; the sampling module (400), whose second input end is connected to the CC signal end of the AC charging interface socket and is used to receive the charging connection confirmation CC signal output by the CC signal end of the AC charging interface socket; the sampling module (400), whose output end VTCC is connected to the second input end of the BMS main control chip (500) and is used to output the sampling signal VTCC of the CC signal; the BMS main control chip (500), whose first input end is connected to the output end of the second power supply module (600) and is used to receive the DC5V output by the second power supply module (600);The second power supply module (600) is used to determine whether to output DC5V to the BMS main control chip (500) according to the control of the wake-up output module (300), and wake up the BMS main control chip (500) when outputting DC5V; the second input terminal of the BMS main control chip (500) is connected to the output terminal VTCC of the sampling module (400) and is used to receive the sampling signal VTCC output by the output terminal VTCC of the sampling module (400); the BMS main control chip (500) is used to judge the connection state of the CC signal terminal of the AC charging interface socket according to the high potential voltage value of the sampling signal VTCC; the output terminal OFF of the BMS main control chip (500) is connected to the third input terminal of the wake-up output module (300) and is used to output the sleep control signal OFF to the wake-up output module (300); The wake-up input module (200) comprises: resistors R1 to R7, diodes D1 to D2 and switch tubes Q1 to Q2, wherein: the first pin of the resistor R1, as the second input end of the wake-up input module (200), is connected to the normal power 12V; the first pin of the resistor R1 is also connected to the first pin of the resistor R4; the second pin of the resistor R1 is connected to the anode of the diode D1; the cathode of the diode D1, as the second input end of the wake-up input module (200), is connected to the AC charging interface CC signal end of the AC charging interface socket; the AC charging interface CC signal end of the AC charging interface socket is also respectively connected to the cathode of the diode D2, the first pin of the resistor R3 and the gate G of the switch tube Q1; The anode of the electrode D2 is connected to the first pin of the resistor R2; the second pin of the resistor R2 is connected to the V1 terminal; the V1 terminal is respectively connected to the second pin of the resistor R5, the first pin of the resistor R6 and the base B of the switch tube Q2; the first pin of the resistor R5 is respectively connected to the second pin of the resistor R4 and the emitter E of the switch tube Q2; the second pin of the resistor R6 is respectively connected to the second pin of the resistor R3 and the source S of the switch tube Q1; the drain D of the switch tube Q1 is connected to the ground terminal GND; the collector C of the switch tube Q2 is connected to the first pin of the resistor R7; the second pin of the resistor R7 is connected to the ground terminal GND; the collector C of the switch tube Q2 serves as the output terminal WKP of the wake-up input module (200); The wake-up output module (300) comprises: resistors R8-R21, diodes D3-D4, capacitors C1-C3, switches Q3-Q5 and a T trigger U1, wherein: the first pin of the resistor R21, as the first input end of the wake-up output module (300), is connected to the output end of the first power supply module (100) and is used to receive a normal voltage of 5V; the second pin of the resistor R21 is connected to the emitter E of the switch tube Q5; the collector C of the switch tube Q5 is connected to the first pin of the resistor R15; the base B of the switch tube Q5 is connected to the collector C of the switch tube Q4; the base B of the switch tube Q4 is respectively connected to the first pin of the resistor R19 and the second pin of the resistor R20; the emitter E of the switch tube Q4 is respectively connected to The second pin of the resistor R19 and the ground terminal GND; the first pin of the resistor R20, as the second input terminal of the wake-up output module (300), is connected to the output terminal WKP of the wake-up input module (200); the first pin of the resistor R20 is also connected to the first pin of the resistor R8; the second pin of the resistor R15 is connected to the power input terminal VCC of the T trigger U1; the input terminal T of the T trigger U1 is connected to the TIN terminal; the TIN terminal is respectively connected to the second pin of the resistor R8, the first pin of the capacitor C1, the second pin of the resistor R9 and the second pin of the resistor R12; the clock signal input terminal CP of the T trigger U1 is respectively connected to the cathode of the diode D3, the cathode of the diode D4 and the first pin of the resistor R11. pin; the output terminal Q of the T trigger U1 is connected to the first pin of the resistor R16; the second pin of the resistor R16, as the output terminal of the wake-up output module (300), is connected to the enable terminal EN; the enable terminal EN is connected to the input terminal of the second power supply module (600); the enable terminal EN is also connected to the first pin of the resistor R17; the second pin of the resistor R17 is connected to the ground terminal GND; the anode of the diode D3 is connected to the first pin of the resistor R18; the second pin of the resistor R18 is connected to the output terminal OFF of the BMS main control chip (500); the second pin of the capacitor C1 is connected to the ground terminal GND; the second pin of the resistor R11 is connected to the ground terminal GND; the anode of the diode D4 is connected to the V2 terminal; the V2 terminal , respectively connected to the collector C of the switching tube Q3 and the first pin of the resistor R10; the second pin of the resistor R10 is respectively connected to the first pin of the capacitor C2 and the first pin of the resistor R9; the second pin of the capacitor C2 is connected to the ground terminal GND; the second pin of the resistor R9 is connected to the TIN terminal; the base B of the switching tube Q3 is respectively connected to the first pin of the resistor R13 and the first pin of the resistor R14; the emitter E of the switching tube Q3 is connected to the ground terminal GND; the second pin of the resistor R14 is connected to the ground terminal GND; the second pin of the resistor R13 is respectively connected to the first pin of the capacitor C3 and the first pin of the resistor R12; the second pin of the resistor R12 is connected to the TIN terminal; the second pin of the capacitor C3 is grounded.

2. The AC charging CC signal detection circuit with a wake-up function according to claim 1, characterized in that: Depending on the connection status of the charging gun, the voltage value of the sampling signal VTCC is as follows:

1. When the AC charging interface socket is not plugged into a charging gun, the sampling signal VTCC outputted by the sampling module (400) output terminal VTCC is at a low level; 2. When the AC charging interface socket is plugged into a charging gun, the sampling signal VTCC outputted by the sampling module (400) output terminal VTCC changes from a low level to a high level; 3. When charging is completed and the charging gun is not unplugged from the AC charging interface socket, the sampling signal VTCC outputted by the sampling module (400) output terminal VTCC changes from a high level to a low level; 4. When the charging gun is unplugged from the AC charging interface socket, the sampling signal VTCC outputted by the sampling module (400) output terminal VTCC remains at a low level.

3. The AC charging CC signal detection circuit with a wake-up function according to claim 1, wherein: The T trigger U1 is a positive edge triggered trigger.

4. The AC charging CC signal detection circuit with a wake-up function according to any one of claims 1 to 3, characterized in that: The sampling module (400) comprises: resistors R30 to R33 and a diode D20, wherein: the second pin of the resistor R30 serves as the first input terminal of the sampling module (400), connected to the output terminal of the second power supply module (600), and used to receive DC5V; the first pin of the resistor R30 is connected to the V3 terminal; the V3 terminal is respectively connected to the first pin of the resistor R31 and the second pin of the resistor R33; the second pin of the resistor R31 serves as the output terminal VTCC of the sampling module (400); the second pin of the resistor R31 is connected to the first pin of the resistor R32; the second pin of the resistor R32 is connected to the ground terminal GND; the first pin of the resistor R33 is connected to the anode of the diode D20; and the cathode of the diode D20 serves as the second input terminal of the sampling module (400), connected to the AC charging interface CC signal terminal of the AC charging interface socket.

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