Low quiescent current CC wake-up circuit based on domain control

Abstract

The invention discloses a low quiescent current CC wake-up circuit based on domain control, and the circuit comprises a CC wake-up module which is used for processing a CC signal when the CC signal of a charging gun is detected, and then generating a wake-up signal for waking up a domain control module; the domain control module is used for generating a dynamic detection signal for starting the CC sampling feedback module according to the wake-up signal; the CC sampling feedback module is used for dynamically detecting a first voltage corresponding to the charging gun after the charging gun is awakened according to the dynamic detection signal and feeding back the first voltage to the domain control module in real time; the domain control module is further used for calculating the resistance Rcc of the charging gun according to the first voltage, and when the resistance value of the charging gun does not conform to the preset resistance value range, the domain control module closes the CC awakening module. According to the circuit, low quiescent current wakeup and global charging state management are realized, the management efficiency of the charging state of the automobile is improved, and the energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging, and particularly to a low static current CC wake-up circuit based on domain control. Background Art

[0002] With the development of electric vehicle charging systems towards domain control integration, the traditional CC wake-up circuit has a high static current due to continuous voltage division detection, resulting in abnormal battery loss, and it cannot transmit the plug-in gun state to the domain controller, leading to the lack of intelligent charging management functions. In the prior art, the OBC local detection mode is adopted, which has problems such as a high false trigger rate, poor anti-interference ability, and single protocol compatibility, and it is difficult to meet the requirements of ISO 15118 for low power consumption, fast response, and multi-standard adaptation. In view of the above defects, the present invention realizes low static current wake-up and global charging state management through micro-current loop design, domain control collaborative architecture, and two-stage dynamic verification mechanism. Summary of the Invention

[0003] To solve the technical problems in the background art, the present invention proposes a low static current CC wake-up circuit based on domain control.

[0004] A low static current CC wake-up circuit based on domain control proposed by the present invention includes:

[0005] A CC wake-up module, configured to generate a wake-up signal for waking up the domain control module after processing the CC signal when detecting the CC signal of the charging gun;

[0006] A domain control module, configured to generate a dynamic detection signal for starting the CC sampling feedback module according to the wake-up signal;

[0007] A CC sampling feedback module, configured to dynamically detect the first voltage corresponding to the charging gun after waking up according to the dynamic detection signal, and real-time feedback the first voltage to the domain control module;

[0008] The domain control module is further configured to calculate the resistance Rcc of the charging gun according to the first voltage, and when the resistance value of the charging gun does not meet the preset resistance range, the domain control module turns off the CC wake-up module.

[0009] Preferably, the CC wake-up module specifically includes: a capacitor C1, a double Schottky diode D1, a zener diode D3, a capacitor C5, a MOS transistor Q3, a resistor R7, a resistor R9, and a resistor R11. One end of the capacitor C1 is used to connect to the CC signal of the charging gun, and the other end of the capacitor C1 is grounded. One end of the capacitor C1 is electrically connected to one end of the resistor R11. Both the first end and the second end of the double Schottky diode D1 are electrically connected to one end of the capacitor C1. The third end of the double Schottky diode D1 is electrically connected to one end of the resistor R9. The other end of the resistor R9 is electrically connected to the positive electrode of the zener diode D3. The resistor R7 and the capacitor C5 are connected in parallel and then connected in parallel with the zener diode D3. The positive electrode of the zener diode D3 is electrically connected to the gate of the MOS transistor Q3. The source of the MOS transistor Q3 is electrically connected to the negative electrode of the zener diode D3. The drain of the MOS transistor Q3 outputs a wake-up signal, and the source of the MOS transistor Q3 outputs a power supply signal.

[0010] Preferably, the CC sampling and feedback module specifically includes a voltage sampling unit and a voltage follower. The voltage sampling unit is used to collect a first voltage corresponding to the charging gun; the voltage follower is used to isolate the analog signal and the transient impact of the switched capacitor when collecting the first voltage.

[0011] Preferably, the voltage sampling unit specifically includes: a MOS transistor Q1, a capacitor C2, a resistor R2, a resistor R3, a resistor R4, a capacitor C3, and a double Schottky diode D2; the gate of the MOS transistor Q1 is electrically connected to one end of the capacitor C2, the source of the MOS transistor Q1 is electrically connected to the other end of the capacitor C2, one end of the capacitor C2 is electrically connected to one end of the resistor R2, the other end of the resistor R2 is connected to the power supply VDD, one end of the resistor R2 is electrically connected to one end of the resistor R3, the other end of the resistor R3 is grounded, the other end of the capacitor C2 is electrically connected to the third end of the double Schottky diode D2, the first end of the double Schottky diode D2 is connected to the 5V power supply, the third end of the double Schottky diode D2 is electrically connected to one end of the resistor R4, the other end of the resistor R4 is electrically connected to one end of the capacitor C3, and the other end of the capacitor C3 is grounded; a voltage signal corresponding to the first voltage is output through the other end of the resistor R4; the drain of the MOS transistor Q1 is electrically connected to the CC wake-up module.

[0012] Preferably, the voltage follower specifically includes: MOS transistor Q2, capacitor C4, resistor R6, resistor R5, resistor R8; the gate of MOS transistor Q2 is electrically connected to one end of capacitor C4, the other end of capacitor C4 is electrically connected to the source of MOS transistor Q2, the gate of MOS transistor Q2 is electrically connected to one end of resistor R6, the other end of resistor R6 is grounded, one end of resistor R6 is electrically connected to one end of resistor R5, the other end of resistor R5 is connected to power supply VDD, the other end of capacitor C4 is electrically connected to one end of resistor R8, and the other end of resistor R8 is connected to a 5V power supply; the drain of MOS transistor Q2 is electrically connected to the CC wake-up module.

[0013] Preferably, it further includes:

[0014] The CC wake-up module is further configured to trigger a power supply signal for powering the domain control module and transmit the power supply signal to the CC wake-up power supply module;

[0015] The CC wake-up power supply module is configured to power the domain control module according to the power supply signal.

[0016] Preferably, the CC wake-up power supply module specifically includes: MOS transistor Q4, zener diode D4, zener diode D5, resistor R13; the source of MOS transistor Q4 is electrically connected to the negative electrode of zener diode D4, the gate of MOS transistor Q4 is electrically connected to the positive electrode of zener diode D4, the drain of MOS transistor Q4 is connected to the battery pack, zener diode D4 and zener diode D5 are connected in parallel in the same direction and then connected in parallel with resistor R13, and the negative electrode of zener diode D4 is connected to the power supply signal.

[0017] Preferably, it further includes:

[0018] The domain control module is further configured to generate an enabling signal for the OBC for powering the auxiliary power supply according to the wake-up signal and transmit the enabling signal of the OBC to the OBC auxiliary power supply module;

[0019] The OBC auxiliary power supply module is configured to power the auxiliary power supply through the battery pack in the CC wake-up power supply module according to the enabling signal of the OBC;

[0020] The OBC auxiliary power supply voltage sampling module is configured to detect the power supply voltage signal of the auxiliary power supply in real time and transmit the power supply voltage signal to the domain control module;

[0021] The domain control module is further configured to cut off the enabling signal of the OBC when the power supply voltage corresponding to any moment of the received power supply voltage signal does not meet the preset voltage value.

[0022] Preferably, the OBC auxiliary power supply module specifically includes: MOS transistor Q5, capacitor C7, resistor R10, resistor R12, resistor R14, resistor R15, resistor R16, triode Q6A; the gate of MOS transistor Q5 is electrically connected to one end of resistor R14, the other end of resistor R14 is electrically connected to the collector of triode Q6A, the base of triode Q6A is electrically connected to one end of resistor R15, the other end of resistor R15 is electrically connected to the output end of the domain control module, the base of triode Q6A is electrically connected to one end of resistor R16, the emitter of triode Q6A is grounded together with the other end of resistor R16, the gate of MOS transistor Q5 is electrically connected to one end of capacitor C7, the source of MOS transistor Q5 is electrically connected to the other end of capacitor C7, one end of capacitor C7 is electrically connected to the positive electrode of zener diode D5, the other end of capacitor C7 is electrically connected to the negative electrode of zener diode D5, the drain of MOS transistor Q5 is electrically connected to one end of resistor R10, the other end of resistor R10 is electrically connected to one end of resistor R12, the other end of resistor R12 is grounded, and one end of resistor R10 is electrically connected to the auxiliary power supply.

[0023] Preferably, the OBC auxiliary power supply voltage sampling module specifically includes: resistor R17, capacitor C6, one end of resistor R17 is electrically connected to one end of resistor R12, the other end of resistor R17 is electrically connected to one end of capacitor C6, the other end of capacitor C6 is grounded, and one end of capacitor C6 is electrically connected to the input end of the domain control module.

[0024] In the present invention, the proposed domain control-based low static current CC wake-up circuit, when detecting the CC signal of the charging gun, processes the CC signal and generates a wake-up signal for waking up the domain control module; generates a dynamic detection signal for starting the CC sampling feedback module according to the wake-up signal; dynamically detects the first voltage corresponding to the charging gun after waking up according to the dynamic detection signal, and real-time feeds back the first voltage to the domain control module; calculates the resistance Rcc of the charging gun according to the first voltage, and when the resistance value of the charging gun does not meet the preset resistance range, the domain control module closes the CC wake-up module. The two-stage dynamic verification mechanism realizes fast wake-up response; through the domain control collaborative architecture, the plug-in state, charging parameters and fault information are globally synchronized, realizing low static current wake-up and global charging state management, improving the management efficiency of the vehicle charging state and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall circuit structure of a domain control-based low static current CC wake-up circuit proposed by the present invention;

[0026] Figure 2 is a schematic diagram of the structure of the CC wake-up module of a domain control-based low static current CC wake-up circuit proposed by the present invention;

[0027] Figure 3 Structural schematic diagram of the CC sampling feedback module of a CC wake-up circuit with low static current based on domain control proposed by the present invention;

[0028] Figure 4 Structural schematic diagram of the domain control module of a CC wake-up circuit with low static current based on domain control proposed by the present invention;

[0029] Figure 5 Structural schematic diagram of the CC wake-up power supply module of a CC wake-up circuit with low static current based on domain control proposed by the present invention;

[0030] Figure 6 Structural schematic diagram of the OBC auxiliary power supply module of a CC wake-up circuit with low static current based on domain control proposed by the present invention;

[0031] Figure 7 Structural schematic diagram of the OBC auxiliary power supply voltage sampling module of a CC wake-up circuit with low static current based on domain control proposed by the present invention;

[0032] Figure 8 Schematic diagram of the implementation process of a CC wake-up circuit with low static current based on domain control proposed by the present invention. Detailed implementation manner

[0033] Refer to Figure 1-8 , a CC wake-up circuit with low static current based on domain control proposed by the present invention includes:

[0034] A CC wake-up module, configured to generate a wake-up signal for waking up the domain control module after processing the CC signal when detecting the CC signal of the charging gun.

[0035] In this embodiment, the CC wake-up module specifically includes: capacitor C1, dual Schottky diode D1, zener diode D3, capacitor C5, MOS transistor Q3, resistor R7, resistor R9, resistor R11. One end of capacitor C1 is used to connect to the CC signal of the charging gun, and the other end of capacitor C1 is used to connect to the ground. One end of capacitor C1 is electrically connected to one end of resistor R11. Both the first end and the second end of dual Schottky diode D1 are electrically connected to one end of capacitor C1. The third end of dual Schottky diode D1 is electrically connected to one end of resistor R9. The other end of resistor R9 is electrically connected to the positive electrode of zener diode D3. Resistor R7 and capacitor C5 are connected in parallel and then connected in parallel with zener diode D3. The positive electrode of zener diode D3 is electrically connected to the gate of MOS transistor Q3. The source of MOS transistor Q3 is electrically connected to the negative electrode of zener diode D3. The drain of MOS transistor Q3 outputs the wake-up signal, and the source of MOS transistor Q3 outputs the power supply signal.

[0036] In this embodiment, it further includes:

[0037] A CC wake-up module, which is further configured to trigger a power supply signal for powering the domain control module and transmit the power supply signal to the CC wake-up power supply module.

[0038] In this embodiment, the CC wake-up power supply module is configured to supply power to the domain control module according to the power supply signal.

[0039] Specifically, the CC wake-up power supply module specifically includes: an MOS transistor Q4, a zener diode D4, a zener diode D5, and a resistor R13. The source electrode of the MOS transistor Q4 is electrically connected to the negative electrode of the zener diode D4, the gate electrode of the MOS transistor Q4 is electrically connected to the positive electrode of the zener diode D4, the drain electrode of the MOS transistor Q4 is connected to the battery pack, the zener diode D4 and the zener diode D5 are connected in parallel in the same direction and then connected in parallel with the resistor R13, and the negative electrode of the zener diode D4 is connected to the power supply signal.

[0040] In this embodiment, the battery pack is a 12V battery pack. The MOS transistor Q3 is an N-channel enhancement-mode MOS transistor, and its threshold voltage Vth ranges from 1.5V to 2.5V, and the breakdown voltage Vz of the zener diode D3 satisfies the following relationship:

[0041]

[0042] Among them, the resistance value of R7 is 100kΩ ± 5%, and the resistance value of R9 is 10kΩ ± 5%.

[0043] Specifically, as Figure 1 shown, after the charging gun is inserted, the core trigger signal for CC wake-up is the change in the resistance connected to the CC pin when the charging gun is inserted. After the charging gun is inserted, the CC pin forms a loop with the CC wake-up power supply module through the external resistor Rcc inside the charging gun, that is, after the CC signal passes through D1, R9, and R7, it conducts with the UB_SBC signal formed by the conduction of the 12V small battery low-voltage power supply through the body diode of Q4 to form a loop. The 12V of the small battery is divided by the resistors (such as R7 and R9) and the external resistor (the resistor inside the charging gun head) to generate a divided voltage signal. The divided voltage signal passes through the combined action of the zener diode D3 and the capacitor C5 to ensure the stability of the VGS voltage signal of the MOS transistor Q3, and at this moment, the voltage at the 2nd pin of Q3 is higher than that at the 1st pin, greater than the conduction voltage Vth, and then conducts, and the current flows from the S electrode to the D electrode. After Q3 conducts, there is also a voltage at the CC_WAKE terminal. After becoming a wake-up signal, it starts to wake up the domain control module and sends a high-level wake-up signal (such as the EN pin) to the power management chip.

[0044] The domain control module is configured to generate a dynamic detection signal for starting the CC sampling feedback module according to the wake-up signal.

[0045] In this embodiment, the domain control module includes an SBC module and a domain control MCU module. The SBC module is connected in series with the domain control MCU module, and the wake-up signal is processed by the SBC module and then transmitted to the domain control MCU module.

[0046] Specifically, the SBC (System Basis Chip) module is a core integrated chip in automotive electronics and the BMS (Battery Management System). Its working process involves signal reception, processing, and output control. In the present invention, the SBC module first receives a power signal, that is, the voltage signal after Q3 conducts, generally 6V - 40V, which is converted into multiple regulated outputs (such as 5V / 3.3V) through internal DC / DC and LDO for use by the domain control MCU module, sensors, etc. Immediately following is the SBC wake-up signal, which triggers the system to activate from the sleep state through external input (such as a button, network wake-up). Subsequently, after the SBC wakes up, it receives communication signals, receives instructions from the CAN bus or other communication interfaces (such as wake-up instructions, control instructions), and some SBCs support the CAN FD protocol.

[0047] In this embodiment, the working process of the SBC module:

[0048] 1. Receive the wake-up signal (i.e., Q3 conducts) → Convert it into a digital signal through ADC → Transmit it to the domain control MCU module for processing.

[0049] 2. Detect that there is no watchdog signal from the domain control MCU module → Trigger a reset signal → Force the domain control MCU module to restart.

[0050] 3. The communication bus sends an overcharge warning → The SBC parses the instruction → Output the SS1 signal to cut off the relay.

[0051] The SBC integrates a power supply to supply power to the domain control MCU module and other modules, and also integrates a CAN transceiver. When VCCA is not used correctly, resulting in the reset signal remaining low level, it shows that the monitoring mechanism of the SBC will affect the reset output. This indicates the role of the SBC in power management and fault detection. The SBC module realizes the efficient processing of input signals and multi-channel output control through the integration of power supply, communication, and diagnostic functions, ensuring the safety and real-time performance of the system. Its core functions include ensuring stable power supply, monitoring the operation of the MCU, and implementing safety policies, and it is the "central nervous system" of automotive electronics and the battery management system.

[0052] The CC sampling feedback module is used to dynamically detect the first voltage corresponding to the charging gun after waking up according to the dynamic detection signal, and to real-time feedback the first voltage to the domain control module.

[0053] In this embodiment, the CC sampling feedback module specifically includes a voltage sampling unit and a voltage follower. The voltage sampling unit is used to collect the first voltage corresponding to the charging gun; the voltage follower is used to isolate the analog signal from the transient impact of the switched capacitor when collecting the first voltage.

[0054] Specifically, the voltage sampling unit specifically includes: MOS transistor Q1, capacitor C2, resistor R2, resistor R3, resistor R4, capacitor C3, dual Schottky diode D2; the gate of MOS transistor Q1 is electrically connected to one end of capacitor C2, the source of MOS transistor Q1 is electrically connected to the other end of capacitor C2, one end of capacitor C2 is electrically connected to one end of resistor R2, the other end of resistor R2 is connected to power supply VDD, one end of resistor R2 is electrically connected to one end of resistor R3, the other end of resistor R3 is grounded, the other end of capacitor C2 is electrically connected to the 3rd terminal of dual Schottky diode D2, the 1st terminal of dual Schottky diode D2 is connected to 5V power supply, the 3rd terminal of dual Schottky diode D2 is electrically connected to one end of resistor R4, the other end of resistor R4 is electrically connected to one end of capacitor C3, and the other end of capacitor C3 is grounded; the voltage signal corresponding to the first voltage is output through the other end of resistor R4; the drain of MOS transistor Q1 is electrically connected to the CC wake-up module.

[0055] Specifically, the voltage follower specifically includes: MOS transistor Q2, capacitor C4, resistor R6, resistor R5, resistor R8; the gate of MOS transistor Q2 is electrically connected to one end of capacitor C4, the other end of capacitor C4 is electrically connected to the source of MOS transistor Q2, the gate of MOS transistor Q2 is electrically connected to one end of resistor R6, the other end of resistor R6 is grounded, one end of resistor R6 is electrically connected to one end of resistor R5, the other end of resistor R5 is connected to power supply VDD, the other end of capacitor C4 is electrically connected to one end of resistor R8, and the other end of resistor R8 is connected to 5V power supply; the drain of MOS transistor Q2 is electrically connected to the CC wake-up module.

[0056] In this embodiment, as Figure 1 shown, the CC sampling feedback module starts to work after receiving an 18V voltage. When VDD18V is awakened, MOS transistor Q2 will turn on, and then the internal resistor Rcc of the charging gun, resistor R11, resistor R8, and VDD5_D are voltage-divided. At the same time, due to the voltage division of resistor R2 and resistor R3, VDD18V makes MOS transistor Q1 reach the conduction condition, and MOS transistor Q1 conducts. The signal is transmitted through Q1 to AN_CC_DET and reaches the domain control MCU module for judgment. If the corresponding voltage meets the preset range and is the correct voltage, after being converted into a certain resistance value, the charging gun starts to charge according to the current corresponding to this resistance value; if it is not within a certain range, the charging stops, and the error information is reported to the charging dock and the domain control MCU, prompting to unplug the gun and use the correct charging gun.

[0057] The domain control module is also used to calculate the resistance Rcc of the charging gun according to the first voltage. When the resistance value of the charging gun does not meet the preset resistance range, the domain control module turns off the CC wake-up module.

[0058] In this embodiment, it further includes:

[0059] The domain control module is also used to generate an enable signal for the OBC that powers the auxiliary power supply according to the wake-up signal, and transmit the enable signal of the OBC to the OBC auxiliary power supply module; the domain control module is also used to cut off the enable signal of the OBC when the supply voltage corresponding to any moment of the received supply voltage signal does not meet the preset voltage value.

[0060] The OBC auxiliary power supply module is used to supply power to the auxiliary power supply through the battery pack in the CC wake-up power supply module according to the enable signal of the OBC.

[0061] In this embodiment, the OBC auxiliary power supply module specifically includes: MOS transistor Q5, capacitor C7, resistor R10, resistor R12, resistor R14, resistor R15, resistor R16, triode Q6A; the gate of MOS transistor Q5 is electrically connected to one end of resistor R14, the other end of resistor R14 is electrically connected to the collector of triode Q6A, the base of triode Q6A is electrically connected to one end of resistor R15, the other end of resistor R15 is electrically connected to the output end of the domain control module, the base of triode Q6A is electrically connected to one end of resistor R16, the emitter of triode Q6A is grounded together with the other end of resistor R16, the gate of MOS transistor Q5 is electrically connected to one end of capacitor C7, the source of MOS transistor Q5 is electrically connected to the other end of capacitor C7, one end of capacitor C7 is electrically connected to the positive electrode of zener diode D5, the other end of capacitor C7 is electrically connected to the negative electrode of zener diode D5, the drain of MOS transistor Q5 is electrically connected to one end of resistor R10, the other end of resistor R10 is electrically connected to one end of resistor R12, the other end of resistor R12 is grounded, and one end of resistor R10 is electrically connected to the auxiliary power supply.

[0062] The OBC auxiliary power supply voltage sampling module is used to detect the supply voltage signal of the auxiliary power supply in real time and transmit the supply voltage signal to the domain control module.

[0063] In this embodiment, the OBC auxiliary power supply voltage sampling module specifically includes: resistor R17, capacitor C6. One end of resistor R17 is electrically connected to one end of resistor R12, the other end of resistor R17 is electrically connected to one end of capacitor C6, the other end of capacitor C6 is grounded, and one end of capacitor C6 is electrically connected to the input end of the domain control module.

[0064] In this embodiment, while the OBC auxiliary power supply module supplies power to the auxiliary power supply, that is, the voltage at point B is also transmitted to the domain control MCU through R17, and then it is judged whether the voltage at point B is correct. If the collected voltage is judged to be correct, the power supply to the OBC auxiliary power supply continues; if it is incorrect, the power supply is stopped. After the charging gun is inserted, CC is connected, and the 12V low-voltage power supply of the small battery conducts through the body diode of MOS tube Q4, and then UB_SBC is divided, MOS tube Q3 conducts, and the wake-up signal CC_WAKE is started. The current consumption in this process is relatively low. The wake-up signal CC_WAKE wakes up the SBC module, and then the domain control MCU module wakes up. Then, LDOs such as VDD_18V and the auxiliary power supply work, and the data collected from CC is processed. If it is correct, the wake-up state is maintained; if it is incorrect, it is turned off. When there is no VDD_18V in this process, the entire circuit does not work. After waking up, sampling processing is performed, thereby reducing the static current.

[0065] At the same time, the enable signal of the OBC auxiliary power supply module is also awakened, the triode Q6A conducts, and then the MOS tube Q5 is turned on. At this time, the MOS tube Q4 conducts to supply power to the auxiliary power supply IC, and the auxiliary power supply module is started. At the same time, the OBC auxiliary power supply voltage sampling module continuously samples the voltage values at both ends of the auxiliary power supply and sends the sampled voltage values to the domain control MCU module for judgment. If it meets the preset data, it is maintained; if it is incorrect, it is turned off. With precise control, the power consumption is also relatively low to save power. All signal wake-ups are sent to the domain control MCU, which realizes control for both the electric control and the power supply, and can also transmit information to the entire vehicle.

[0066] In this embodiment, the overall working principle of the circuit is as follows:

[0067] (a) In the initial sleep state, Q3 is turned off, and a micro-current loop is formed through D1, R9, R7, and D3 at the CC pin, and the static current ≤ 50 μA;

[0068] (b) When the charging gun is inserted, the resistance Rcc between the CC pin and the PE pin causes the gate voltage of Q3 to rise. When V_gs_Q3 ≥ Vth is satisfied, Q3 conducts and generates the CC_WAKE wake-up signal;

[0069] (c) The SBC module responds to the CC_WAKE wake-up signal to wake up the domain control MCU module, and the domain control MCU module controls Q1 to conduct to start the dynamic voltage division network;

[0070] (d) Detect the voltage V dct at the AN_CC_DET pin through the ADC, calculate the charging gun resistance Rcc. If Rcc exceeds the range of 1.3 kΩ - 1.7 kΩ, the domain control MCU module immediately turns off Q5 and resets the system;

[0071] (e) If Rcc is valid, the domain control MCU module sends a PWM signal to Q5 to activate the OBC auxiliary power supply, and the voltage at point B is fed back to the domain control MCU module in real time through R11 to form a closed-loop control.

[0072] Specifically, in step (d), the calculation formula for Rcc is:

[0073]

[0074] Moreover, when it is detected that the fluctuation of Rcc exceeds ±5% continuously for 3 times, it is determined that the connection is abnormal and the fault code is stored.

[0075] As mentioned above, the above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A low static current CC wake-up circuit based on domain control, characterized in that, Including: A CC wake-up module, configured to generate a wake-up signal for waking up the domain control module after processing the CC signal when detecting the CC signal of the charging gun; A domain control module, configured to generate a dynamic detection signal for starting the CC sampling feedback module according to the wake-up signal; A CC sampling feedback module, configured to dynamically detect the first voltage corresponding to the charging gun after waking up according to the dynamic detection signal, and feedback the first voltage to the domain control module in real time; The domain control module is further configured to calculate the resistance Rcc of the charging gun according to the first voltage, and when the resistance value of the charging gun does not meet the preset resistance range, the domain control module turns off the CC wake-up module.

2. The CC wake-up circuit with low static current based on domain control according to claim 1, characterized in that The CC wake-up module specifically includes: a capacitor C1, a double Schottky diode D1, a voltage stabilizing diode D3, a capacitor C5, a MOS transistor Q3, a resistor R7, a resistor R9, and a resistor R11. One end of the capacitor C1 is used to connect to the CC signal of the charging gun, the other end of the capacitor C1 is used to ground, one end of the capacitor C1 is electrically connected to one end of the resistor R11, both the first end and the second end of the double Schottky diode D1 are electrically connected to one end of the capacitor C1, the third end of the double Schottky diode D1 is electrically connected to one end of the resistor R9, the other end of the resistor R9 is electrically connected to the positive electrode of the voltage stabilizing diode D3, the resistor R7 and the capacitor C5 are connected in parallel and then connected in parallel with the voltage stabilizing diode D3, the positive electrode of the voltage stabilizing diode D3 is electrically connected to the gate of the MOS transistor Q3, the source of the MOS transistor Q3 is electrically connected to the negative electrode of the voltage stabilizing diode D3, the drain of the MOS transistor Q3 outputs the wake-up signal, and the source of the MOS transistor Q3 outputs the power supply signal.

3. The CC wake-up circuit with low static current based on domain control according to claim 1, characterized in that The CC sampling feedback module specifically includes a voltage sampling unit and a voltage follower. The voltage sampling unit is configured to collect the first voltage corresponding to the charging gun; the voltage follower is configured to isolate the analog signal and the transient impact of the switched capacitor when collecting the first voltage.

4. The low static current CC wake-up circuit based on domain control according to claim 3, wherein The voltage sampling unit specifically includes: a MOS transistor Q1, a capacitor C2, a resistor R2, a resistor R3, a resistor R4, a capacitor C3, and a double Schottky diode D2; the gate of the MOS transistor Q1 is electrically connected to one end of the capacitor C2, the source of the MOS transistor Q1 is electrically connected to the other end of the capacitor C2, one end of the capacitor C2 is electrically connected to one end of the resistor R2, the other end of the resistor R2 is connected to the power supply VDD, one end of the resistor R2 is electrically connected to one end of the resistor R3, the other end of the resistor R3 is grounded, the other end of the capacitor C2 is electrically connected to the third end of the double Schottky diode D2, the first end of the double Schottky diode D2 is connected to the 5V power supply, the third end of the double Schottky diode D2 is electrically connected to one end of the resistor R4, the other end of the resistor R4 is electrically connected to one end of the capacitor C3, and the other end of the capacitor C3 is grounded; a voltage signal corresponding to the first voltage is output through the other end of the resistor R4; the drain of the MOS transistor Q1 is electrically connected to the CC wake-up module.

5. The low static current CC wake-up circuit based on domain control according to claim 3, wherein The voltage follower specifically includes: MOS transistor Q2, capacitor C4, resistor R6, resistor R5, resistor R8; the gate of MOS transistor Q2 is electrically connected to one end of capacitor C4, the other end of capacitor C4 is electrically connected to the source of MOS transistor Q2, the gate of MOS transistor Q2 is electrically connected to one end of resistor R6, the other end of resistor R6 is grounded, one end of resistor R6 is electrically connected to one end of resistor R5, the other end of resistor R5 is connected to power supply VDD, the other end of capacitor C4 is electrically connected to one end of resistor R8, and the other end of resistor R8 is connected to a 5V power supply; the drain of MOS transistor Q2 is electrically connected to the CC wake-up module.

6. The low static current CC wake-up circuit based on domain control according to claim 1, characterized in that, It further includes: The CC wake-up module is further configured to trigger a power supply signal for powering the domain control module and transmit the power supply signal to the CC wake-up power supply module; The CC wake-up power supply module is configured to power the domain control module according to the power supply signal.

7. The CC wake-up circuit with low static current based on domain control according to claim 6, characterized in that, The CC wake-up power supply module specifically includes: MOS transistor Q4, zener diode D4, zener diode D5, resistor R13, the source of MOS transistor Q4 is electrically connected to the negative electrode of zener diode D4, the gate of MOS transistor Q4 is electrically connected to the positive electrode of zener diode D4, the drain of MOS transistor Q4 is connected to the battery pack, zener diode D4 and zener diode D5 are connected in parallel in the same direction and then connected in parallel with resistor R13, and the negative electrode of zener diode D4 is connected to the power supply signal.

8. The CC wake-up circuit with low static current based on domain control according to claim 7, characterized in that, It further includes: The domain control module is further configured to generate an enable signal for the OBC for powering the auxiliary power supply according to the wake-up signal and transmit the enable signal of the OBC to the OBC auxiliary power supply module; The OBC auxiliary power supply module is configured to power the auxiliary power supply through the battery pack in the CC wake-up power supply module according to the enable signal of the OBC; The OBC auxiliary power supply voltage sampling module is configured to detect the power supply voltage signal of the auxiliary power supply in real time and transmit the power supply voltage signal to the domain control module; The domain control module is further configured to cut off the enable signal of the OBC when the power supply voltage corresponding to any moment of the received power supply voltage signal does not meet the preset voltage value.

9. The CC wake-up circuit with low static current based on domain control according to claim 8, characterized in that, The OBC auxiliary power supply module specifically includes: MOS transistor Q5, capacitor C7, resistor R10, resistor R12, resistor R14, resistor R15, resistor R16, triode Q6A; the gate of MOS transistor Q5 is electrically connected to one end of resistor R14, the other end of resistor R14 is electrically connected to the collector of triode Q6A, the base of triode Q6A is electrically connected to one end of resistor R15, the other end of resistor R15 is electrically connected to the output end of the domain control module, the base of triode Q6A is electrically connected to one end of resistor R16, the emitter of triode Q6A and the other end of resistor R16 are grounded together, the gate of MOS transistor Q5 is electrically connected to one end of capacitor C7, the source of MOS transistor Q5 is electrically connected to the other end of capacitor C7, one end of capacitor C7 is electrically connected to the positive electrode of zener diode D5, the other end of capacitor C7 is electrically connected to the negative electrode of zener diode D5, the drain of MOS transistor Q5 is electrically connected to one end of resistor R10, the other end of resistor R10 is electrically connected to one end of resistor R12, the other end of resistor R12 is grounded, and one end of resistor R10 is electrically connected to the auxiliary power supply.

10. The low static current CC wake-up circuit based on domain control according to claim 9, characterized in that, The OBC auxiliary power supply voltage sampling module specifically includes: resistor R17, capacitor C6, one end of resistor R17 is electrically connected to one end of resistor R12, the other end of resistor R17 is electrically connected to one end of capacitor C6, the other end of capacitor C6 is grounded, and one end of capacitor C6 is electrically connected to the input end of the domain control module.

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