AC slow charging CP charging control guide circuit

Abstract

The invention discloses an AC slow charging CP charging control guide circuit. A circuit system comprises a CP signal input circuit, a power supply wake-up recovery module, a power supply wake-up input module and a CP wake-up input digital quantity PWM recovery module. The method specifically comprises a CP awakening input analog quantity acquisition process, a CP alternating current slow charging digital quantity PWM acquisition process and a CP alternating current slow charging digital quantity PWM acquisition process. Therefore, by optimizing a signal processing algorithm and a hardware circuit design, the new energy vehicle accurately identifies various characteristic parameters of the CP signal, accurately judges the connection state and the charging mode between the vehicle and the charging pile, enhances the stability of the AC slow-charging CP detection system, ensures that the AC slow-charging CP detection system reliably operates under various working conditions and different environmental conditions, and improves the reliability of the AC slow-charging CP detection system. The compatibility problem between automobiles of different brands and models and charging piles is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of AC slow charging of new energy vehicles, and in particular to an AC slow charging CP charging control guide circuit with simple circuit, high efficiency, high adaptability, high detection accuracy, strong anti-interference ability and simple detection logic. Background Art

[0002] The traditional new energy vehicle AC slow charging CP detection circuit does not have a gun plug wake-up function.

[0003] The structure of the AC slow-charging CP detection circuit for traditional new energy vehicles is complex, involving the coordinated work of multiple analog and digital circuits, which increases the difficulty of hardware design and the number of components, thereby increasing the cost of the entire charging system.

[0004] The digital quantity collection range of AC slow charging CP detection of traditional new energy vehicles is narrow, and the detection accuracy is low, which can easily cause false alarms.

[0005] The AC slow charging CP detection compatibility of traditional new energy vehicles is low and cannot adapt to charging modes of different standards at the same time.

[0006] The anti-interference ability of AC slow charging CP detection of traditional new energy vehicles is weak, and it is easily interfered by high-power devices of charging equipment, which affects the normal operation of the charging system and may even cause safety hazards. Summary of the invention

[0007] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0008] To this end, the purpose of the present invention is to propose an AC slow charging CP charging control guidance circuit, providing an AC slow charging CP detection circuit with simple circuit, high efficiency, high adaptability, high detection accuracy, strong anti-interference ability and simple detection logic.

[0009] To achieve the above object, the present invention proposes an AC slow charging CP charging control guide circuit, the method specifically includes: a CP wake-up input analog quantity acquisition process and a CP AC slow charging digital quantity PWM acquisition process;

[0010] The CP wake-up input analog quantity acquisition process method includes:

[0011] S1.1. Insert the slow charging gun into the charging port of the new energy vehicle;

[0012] S1.2, the slow charging pile inputs a 12V level signal, which passes through detection point 1 and is then divided by resistors R6 and R7, and input to the MCU acquisition port MCU_AD_CPV. The AD sampling calculation formula is as follows:

[0013]

[0014] Among them, MCU_AD_CPV is the 12V voltage signal input to CP_I N, which is divided by R6 and R7 and input to MCU for collection. 12V is the input voltage, R6 and R7 are the level input collection voltage dividing resistors, and R6+R7 is the sum of the resistor R6 and the resistor R7;

[0015] The CP AC slow charging digital quantity PWM acquisition process method includes:

[0016] S2.1. Insert the slow charging gun into the charging port of the new energy vehicle;

[0017] S2.2, the slow charging pile inputs a 12V level signal, which then passes through detection point 1 and then inputs a 9V and 6V PWM digital signal;

[0018] S2.3, first input a high level signal, the high level signal is divided by resistors R4 and R5, the level signal after the voltage division detects whether it can trigger the NMOS conduction threshold, if it is turned on, it will pull down the U1A pin I N-;

[0019] S2.4, then input a low level signal, the low level signal is divided by resistors R4 and R5, and the level signal after voltage division is detected to see if it can trigger the NMOS conduction threshold. If the NMOS conduction threshold is not met, the U1A pin I N- is judged to be high level;

[0020] S2.5 The power supply voltage VCC is divided by resistors R11 and R12, and the divided voltage level signal provides a reference voltage to the U1A pin IN+;

[0021] S2.6, U1A comparator compares the voltage of U1A pin I N- and U1A pin I N+. When I N+>I N-, NMOS pin 1OUT1 outputs a high level. When I N+

[0022] S3. By detecting the AD level signal collected by the CP wake-up input analog quantity and the digital quantity signal collected by the CP AC slow charging digital quantity PWM, the charging pile and the new energy vehicle can interact and charge normally.

[0023] The input voltage calculation formula of the U1A pin IN+ is:

[0024]

[0025] Wherein, IN+ is an input level signal, VCC is a power supply voltage, R12 and R11 are input level trigger judgment resistors respectively, and R12+R11 is the sum of the resistor R12 and the resistor R11.

[0026] ​The NMOS pin 1 input voltage calculation formula is:

[0027]

[0028] Wherein, CP_I N is R5 and R4 are the digital PWM input voltage divider resistors respectively, and R5+R4 is the sum of the resistors R5 and R4.

[0029] The AC slow charging CP charging control guide circuit of the present invention has the following advantages:

[0030] (1) Improved detection accuracy: By optimizing the signal processing algorithm and hardware circuit design, it can accurately identify various characteristic parameters of the CP signal, such as amplitude, frequency, duty cycle, etc. It effectively overcomes the problem of inaccurate detection caused by signal interference, hardware errors and other factors in the existing technology, thereby ensuring that the charging system can accurately determine the connection status between the vehicle and the charging pile, the charging mode and other information, and provide a reliable basis for a safe and stable charging process.

[0031] (2) Enhanced system stability: Enhanced the stability of the AC slow-charging CP detection system to ensure reliable operation under various working conditions and environmental conditions. By optimizing the design of the hardware circuit, the circuit's anti-interference ability and reliability are improved, reducing detection interruptions or errors caused by hardware failures.

[0032] (3) Improved compatibility and versatility: Solve the compatibility issues between electric vehicles and charging piles of different brands and models, aiming to develop a universal AC slow charging CP detection technology.

[0033] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0035] Figure 1 This is a functional block diagram of the AC slow charging CP charging control guide circuit of the present invention;

[0036] Figure 2 This is a block diagram of the AC slow charging CP charging control guide circuit system of the present invention;

[0037] Figure 3 This is a schematic diagram of the AC slow charging CP charging control guide circuit of the present invention;

[0038] Figure 4 This is a schematic diagram of the control and guidance circuit of the present invention. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limitations of the present invention. On the contrary, embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0040] An AC slow charging CP charging control guidance circuit according to an embodiment of the present invention is described below in conjunction with the accompanying drawings.

[0041] like Figure 1-4 As shown, an AC slow charging CP charging control guidance circuit of an embodiment of the present invention, the circuit system includes a CP signal input circuit, a power wake-up recovery module, a power wake-up input module and a CP wake-up input digital quantity PWM recovery module.

[0042] Among them, the CP signal input circuit is used for the AC slow charging signal input port, the power supply wake-up recovery module is used for MCU digital quantity collection, the power supply wake-up input module is used to wake up the power supply, and the CP wake-up input digital quantity PWM recovery module is used to recover the CP AC slow charging digital quantity.

[0043] It should be noted that the CP signal input circuit in this embodiment is mainly a clock pulse input terminal (CP_I N) for receiving an external clock signal, which plays a role in synchronization and control in the circuit.

[0044] Specifically, the clock signal can control the timing of the circuit to ensure that each part works in a predetermined time sequence. In digital circuits, clock signals are often used for flip-flops, counters, and other operations. In analog circuits, clock signals may also be used to control the opening and closing of analog switches, or to generate specific waveforms.

[0045] In addition, the quality and stability of the clock signal have a great influence on the performance of the circuit. Therefore, when designing a circuit, it is necessary to carefully consider factors such as the source, frequency, and waveform of the clock signal to ensure the stability and reliability of the circuit.

[0046] The CP wake-up voltage recovery module includes a resistor R6, a resistor R7, a resistor R8, an MCU voltage sampling port and a GND pin.

[0047] Among them, the resistor R8 is an input voltage collection voltage divider resistor, the resistor R8 is electrically connected to the MCU voltage sampling port, and the two ends of the resistor R7 are electrically connected to the resistor R6 and the GND pin respectively, and the GND pin is connected to the GND ground.

[0048] It should be noted that MCU (Microcontroller Unit), that is, microcontroller unit, is an integrated circuit that integrates multiple functional modules such as microprocessor, memory, input and output interface (IO interface), timer, serial communication interface and analog-to-digital converter (ADC).

[0049] The power wake-up input module includes a resistor R10, a diode D1 and a pin SBC WAEK.

[0050] The resistor R10 is a wake-up input current limiting resistor, the diode D1 is an input anti-reverse diode, and the pin SBC WAEK is an SBC chip wake-up pin.

[0051] It should be noted that the diode D1 is an input anti-reverse diode to prevent affecting other wake-up sources in the system and improve the stability of the wake-up signal.

[0052] The CP wake-up input digital quantity PWM collection module includes a power supply voltage VCC, a resistor R4, a resistor R5, a resistor R9, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a control guide circuit M2, a GND pin and a digital quantity collection port MCU_PWM_CP.

[0053] Among them, the resistor R9, the resistor R11 and the resistor R12 are respectively the input level trigger judgment resistors, the resistor R13 is the U1A comparator output pull-up resistor, and the resistor R14 is the digital quantity acquisition current limiting resistor. The control guide circuit M2 is used to control the NMOS as a digital quantity control switch, the GND pins are three groups, and the three groups of GND pins are electrically connected to the resistor R5, the resistor R12 and the power supply voltage VCC respectively, and the digital quantity acquisition port MCU_PWM_CP is used for MCU voltage sampling.

[0054] It should be noted that the U1A comparator described in this embodiment is a circuit or device that compares two voltage input signals and outputs a digital signal (high level or low level) to indicate which input signal is larger, and U1A is a prior art, so it is not described in detail here.

[0055] The method specifically includes: a CP wake-up input analog quantity acquisition process and a CP AC slow charging digital quantity PWM acquisition process;

[0056] The CP wake-up input analog quantity acquisition process method includes:

[0057] S1.1. Insert the slow charging gun into the charging port of the new energy vehicle;

[0058] S1.2, the slow charging pile inputs a 12V level signal, which passes through detection point 1 and is then divided by resistors R6 and R7, and input to the MCU acquisition port MCU_AD_CPV. The AD sampling calculation formula is as follows:

[0059]

[0060] Among them, MCU_AD_CPV is the 12V voltage signal input by CP_I N, which is divided by R6 and R7 and input to MCU for collection. 12V is the input voltage, R6 and R7 are the level input collection voltage dividing resistors, and R6+R7 is the sum of the resistor R6 and the resistor R7;

[0061] The CP AC slow charging digital quantity PWM acquisition process method includes:

[0062] S2.1. Insert the slow charging gun into the charging port of the new energy vehicle;

[0063] S2.2, the slow charging pile inputs a 12V level signal, which then passes through detection point 1 and then inputs a 9V and 6V PWM digital signal;

[0064] S2.3, first input a high level signal, the high level signal is divided by resistors R4 and R5, the level signal after the voltage division detects whether it can trigger the NMOS conduction threshold, if it is turned on, it will pull down the U1A pin I N-;

[0065] S2.4, then input a low level signal, the low level signal is divided by resistors R4 and R5, and the level signal after voltage division is detected to see if it can trigger the NMOS conduction threshold. If the NMOS conduction threshold is not met, the U1A pin I N- is judged to be high level;

[0066] S2.5 The power supply voltage VCC is divided by resistors R11 and R12, and the divided voltage level signal provides a reference voltage to the U1A pin IN+;

[0067] S2.6, U1A comparator compares the voltage of U1A pin I N- and U1A pin I N+. When I N+>I N-, NMOS pin 1OUT1 outputs a high level. When I N+

[0068] S3. By detecting the AD level signal collected by the CP wake-up input analog quantity and the digital quantity signal collected by the CP AC slow charging digital quantity PWM, the charging pile and the new energy vehicle can interact and charge normally.

[0069] The input voltage calculation formula of the U1A pin IN+ is:

[0070] ​

[0071] Wherein, IN+ is an input level signal, VCC is a power supply voltage, R12 and R11 are input level trigger judgment resistors respectively, and R12+R11 is the sum of the resistor R12 and the resistor R11.

[0072] The NMOS pin 1 input voltage calculation formula is:

[0073]

[0074] Among them, NMOS pin 1 is a semiconductor transistor, CP_I N is the charging gun input signal pin, R5 and R4 are digital PWM input voltage divider resistors respectively, and R5+R4 is the sum of resistors R5 and R4.

[0075] Digital quantity acquisition truth table:

[0076] CP_IN IN+ and IN- OUT1 0 IN+<IN- 0 1 IN+>IN- 1

[0077] Among them, CP_I N: charging gun input signal pin, 1 represents high level input; 0: represents low level input; OUT1 represents: NMOS pin 1.

[0078] In summary, an AC slow charging CP charging control guidance circuit of an embodiment of the present invention provides an AC slow charging CP detection circuit with simple circuit, high efficiency, high adaptability, high detection accuracy, strong anti-interference ability and simple detection logic.

[0079] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and deform the above embodiments within the scope of the present invention.

Claims

1. An AC slow charging CP charging control guide circuit, characterized in that: The method for the charging control guiding circuit is as follows: The new energy vehicle optimizes the signal processing algorithm and hardware circuit design to accurately identify various characteristic parameters of the CP signal, accurately judge the connection status and charging mode between the vehicle and the charging pile, enhance the stability of the AC slow charging CP detection system, ensure its reliable operation under various working conditions and different environmental conditions, and solve the compatibility problems between vehicles and charging piles of different brands and models; This method specifically includes: the CP wake-up input analog quantity acquisition process and the CP AC slow charging digital quantity PWM acquisition process; The method of the CP wake-up input analog quantity acquisition process includes: S1.1, Insert the slow charging gun into the charging port of the new energy vehicle; S1.2, The slow charging pile inputs a 12V level signal, which passes through detection point 1 and then is divided by resistors R6 and R7 and input to the MCU acquisition port MCU_AD_CPV. The AD sampling calculation formula is as follows: Among them, MCU_AD_CPV is the 12V voltage signal input by CP_IN, which is divided by R6 and R7 and input to the MCU for acquisition. 12V is the input voltage, R6 and R7 are the voltage dividing resistors for level input acquisition, and R6 + R7 is the sum of resistors R6 and R7; The method of the CP AC slow charging digital quantity PWM acquisition process includes: S2.1, Insert the slow charging gun into the charging port of the new energy vehicle; S2.2, The slow charging pile inputs a 12V level signal, which passes through detection point 1 and then inputs 9V and 6V PWM digital quantity signals; S2.3, First input a high-level signal. The high-level signal is divided by resistors R4 and R5, and the divided level signal is used to detect whether it can trigger the NMOS conduction threshold. If it conducts, it pulls down the U1A pin IN-; S2.4, Then input a low-level signal. The low-level signal is divided by resistors R4 and R5, and the divided level signal is used to detect whether it can trigger the NMOS conduction threshold. If the NMOS conduction threshold is not met, the U1A pin IN- is judged to be high level; S2.5, The power supply voltage VCC is divided by resistors R11 and R12, and the divided level signal provides a reference voltage for the U1A pin IN+; S2.6, The U1A comparator compares the voltages of the U1A pin IN- and the U1A pin IN+. When IN+>IN-, the NMOS pin 1OUT1 outputs a high level. When IN+<IN-, the NMOS pin 1OUT1 outputs a low level; S3, By detecting the AD level signal collected by the CP wake-up input analog quantity and the digital quantity signal collected by the CP AC slow charging digital quantity PWM, the normal charging interaction between the charging pile and the new energy vehicle is realized; The system includes a CP signal input circuit, a power supply wake-up feedback module, a power supply wake-up input module, and a CP wake-up input digital quantity PWM feedback module. Among them, The CP signal input circuit is used for the AC slow charging signal input port; The power supply wake-up feedback module is used for MCU digital quantity acquisition; The power supply wake-up input module is used to wake up the power supply; The CP wake-up input digital quantity PWM feedback module is used to feedback the CP AC slow charging digital quantity.

2. The AC slow charging CP charging control guide circuit according to claim 1, characterized in that: The input voltage calculation formula of the U1A pin IN+ is: Among them, IN+ is the input level signal, VCC is the power supply voltage, R12 and R11 are input level trigger judgment resistors respectively, and R12+R11 is the sum of the resistor R12 and the resistor R11.

3. The AC slow charging CP charging control guide circuit according to claim 1, characterized in that: The NMOS pin 1 input voltage calculation formula is: Among them, CP_IN is the charging gun CP input signal, which is divided by R4 and R5 and input to NOMS pin 1. R5 and R4 are digital PWM input voltage divider resistors respectively, and R5+R4 is the sum of resistors R5 and R4.

4. The AC slow charging CP charging control guide circuit according to claim 1, characterized in that: The CP wake-up voltage recovery module includes a resistor R6, a resistor R7, a resistor R8, an MCU voltage sampling port and a GND pin, wherein: The resistor R8 is a voltage-dividing resistor for input voltage collection, and the resistor R8 is electrically connected to the MCU voltage sampling port; Two ends of the resistor R7 are electrically connected to the resistor R6 and a GND pin respectively, and the GND pin is connected to the GND ground.

5. The AC slow charging CP charging control guide circuit according to claim 1, characterized in that: The power wake-up input module includes a resistor R10, a diode D1 and a pin SBC WAEK, wherein: The resistor R10 is a wake-up input current limiting resistor; The diode D1 is an input anti-reverse diode; The pin SBC WAEK is an SBC chip wake-up pin.

6. The AC slow charging CP charging control guide circuit according to claim 1, characterized in that: The CP wake-up input digital quantity PWM collection module includes a power supply voltage VCC, a resistor R4, a resistor R5, a resistor R9, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a control guide circuit M2, a GND pin and a digital quantity collection port MCU_PWM_CP, wherein: The resistor R9, the resistor R11 and the resistor R12 are respectively the input level trigger judgment resistors; The resistor R13 is the pull-up resistor of the U1A comparator output; The resistor R14 is a current limiting resistor for digital quantity acquisition; The control guide circuit M2 is used to control the digital control switch of the NMOS; The GND pins are divided into three groups, and the three groups of GND pins are electrically connected to the resistor R5, the resistor R12 and the power supply voltage VCC respectively; The digital quantity acquisition port MCU_PWM_CP is used for MCU voltage sampling.

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