AC slow charging CP charging control guide circuit

Abstract

The invention belongs to the technical field of new energy automobiles, and particularly relates to an alternating current slow charging CP charging control guide circuit which comprises a CP signal input end, a power supply awakening module, an awakening level recovery module and a PWM signal recovery module. Wherein the CP signal input end is connected with the power supply wake-up module, the wake-up level recovery module and the PWM signal recovery module. By optimizing a signal processing algorithm and a hardware circuit design, various characteristic parameters of the CP signal can be accurately identified, and the problem of inaccurate detection caused by factors such as signal interference and hardware errors in the prior art is effectively solved; therefore, it is ensured that the charging system can accurately judge the connection state between the vehicle and the charging pile, the charging mode and other information, and a reliable basis is provided for the safe and stable charging process.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and particularly to an AC slow charging CP charging control and guiding circuit. Background Art

[0002] New energy electric vehicles, the composition of new energy electric vehicles includes: electric drive and control systems, mechanical systems such as driving force transmission, working devices to complete established tasks, etc.

[0003] The electric drive and control system is the core of an electric vehicle and also the biggest difference from an internal combustion engine vehicle. The electric drive and control system consists of a drive motor, a power source, and a speed control device for the motor, etc. The other devices of an electric vehicle are basically the same as those of an internal combustion engine vehicle.

[0004] Traditional new energy vehicles have the following problems: The AC slow charging CP detection circuit does not have a function of waking up when the charging gun is inserted, and the structure of the AC slow charging CP detection circuit is complex, involving the coordinated operation of a variety of analog and digital circuits, which increases the difficulty of hardware design and the number of components, and further leads to an increase in the cost of the entire charging system. Summary of the Invention

[0005] The purpose of the present invention is to provide an AC slow charging CP charging control and guiding circuit to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: an AC slow charging CP charging control and guiding circuit, including: A CP signal input terminal, a power source wake-up module, a wake-up level sampling module, and a PWM signal sampling module; Among them, the CP signal input terminal is connected to the power source wake-up module, the wake-up level sampling module, and the PWM signal sampling module.

[0007] Preferably, it further includes an S2 switch, and the S2 switch is located between the CP signal input terminal and the power source wake-up module, the wake-up level sampling module, and the PWM signal sampling module.

[0008] Preferably, the S2 switch includes a diode D2, a resistor R2, a resistor R3, a control and guiding circuit switch S2, and an NMOS M1. The CP signal input terminal is connected to the positive electrode of the diode D2. The negative electrode of the diode D2 is connected to the resistor R2, the resistor R3, the power source wake-up module, the wake-up level sampling module, and the PWM signal sampling module. The resistor R3 is grounded. The resistor R2 is connected to the pin 3 of the NMOS M1. The S2 switch is connected to the pin 1 of the NMOS M1. The pin 2 of the NMOS M1 is grounded.

[0009] Preferably, the wake-up level acquisition module includes a resistor R6, a resistor R7, a resistor R8, and an MCU_AD_CPV. The negative electrode of the diode D2 is connected to one end of the resistor R6. The other end of the resistor R6 is connected to one ends of the resistor R7 and the resistor R8. The other end of the resistor R7 is grounded. The other end of the resistor R8 is connected to the MCU_AD_CPV.

[0010] Preferably, the power supply wake-up module includes a resistor R10 and a diode D1. One end of the resistor R10 is connected to the negative electrode of the diode D2. The other end of the resistor R10 is connected to the positive electrode of the diode D1. The negative electrode of the diode D1 outputs to SBC_WAEK.

[0011] Preferably, the PWM signal acquisition module includes a resistor R4, a resistor R5, an NMOS M2, a resistor R9, a resistor R11, a resistor R12, a resistor R13, a resistor R14, an MCU_PWM_CP, and a comparator U1A. One end of the resistor R4 is connected to the negative electrode of the diode D2. The other end of the resistor R4 is connected to one end of the resistor R5 and pin 1 of the NMOS M2. The other end of the resistor R5 is connected to pin 2 of the NMOS M2 and grounded. Pin 3 of the NMOS M2 is connected to one end of the resistor R9 and the negative input pin of the comparator U1A. The other end of the resistor R9 is connected to one end of the resistor R11. The other end of the resistor R11 is connected to the positive input pin of the comparator U1A and one end of the resistor R12. The other end of the resistor R12 is grounded. The negative power supply pin of the comparator U1A is grounded. The positive power supply pin of the comparator U1A is connected to one ends of the resistor R11 and the resistor R13. The output pin of the comparator U1A is connected to one end of the resistor R14 and the other end of the resistor R13. The other end of the resistor R14 is connected to the MCU_PWM_CP.

[0012] Preferably, the specific CP wake-up input analog quantity acquisition process of this AC slow charging CP charging control and guidance circuit is as follows: When the slow charging gun is inserted, the slow charging pile inputs a 12V level signal, which is divided by the resistor R6 and the resistor R7 and input to the MCU acquisition port MCU_AD_CPV. Specific CP AC slow charging digital quantity PWM acquisition process: When the slow charging gun is inserted, the slow charging pile inputs 12V, and then inputs 9V and 6V PWM digital quantity signals. When a high level is input, it is divided by the resistor R4 and the resistor R5 to trigger the NMOS M2 to conduct and pull down the negative input pin of the comparator U1A. When a low level is input, it is divided by the resistor R4 and the resistor R5, and the conduction threshold of the NMOS M2 is not satisfied, so the NMOS M2 does not conduct, and the negative input pin of the comparator U1A is at a high level. The VCC is divided by resistors R11 and R12 to provide a reference voltage to the positive input pin of comparator U1A; Comparator U1A compares the voltages at the negative input pin and the positive input pin. When the voltage at the positive input pin > the voltage at the negative input pin, the output pin of comparator U1A outputs a high level; When the voltage at the positive input pin < the voltage at the negative input pin, the output pin of comparator U1A outputs a low level; Through the detected AD level and digital quantity signal, the interaction with the charging pile is realized to achieve normal charging Preferably, the sampling calculation formula of the MCU_AD_CPV is as follows: MCU_AD_CPV = 12V * R7 / (R6 + R7).

[0013] Preferably, the calculation formula for the input voltage of the positive input pin of comparator U1A is as follows: Voltage at the positive input pin = VCC * R12 / (R12 + R11).

[0014] Preferably, the calculation of the input voltage of NMOS M2: Input voltage of NMOS M2 = Voltage at the CP signal input terminal * R5 / (R5 + R4).

[0015] Compared with the prior art, the beneficial effects of the present invention are: Improve detection accuracy: By optimizing the signal processing algorithm and hardware circuit design, various characteristic parameters of the CP signal, such as amplitude, frequency, duty cycle, etc., can be accurately identified. Effectively overcome the problem of inaccurate detection caused by factors such as signal interference and hardware errors in the prior art, so as to ensure that the charging system can accurately judge information such as the connection status and charging mode between the vehicle and the charging pile, providing a reliable basis for a safe and stable charging process.

[0016] Enhance system stability: Enhance the stability of the AC slow charging CP detection system to ensure reliable operation under various working conditions and environmental conditions. Through the optimized design of the hardware circuit, improve the anti-interference ability and reliability of the circuit, and reduce detection interruptions or errors caused by hardware failures.

[0017] Improve compatibility and universality: Solve the compatibility problem between electric vehicles and charging piles of different brands and models, aiming to develop a general AC slow charging CP detection technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the system logic block diagram of the present invention; Figure 2 is the circuit schematic diagram of the present invention; Figure 3 It is a timing diagram for AC charging connection control. Specific implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0021] Embodiment 1. Please refer to Figures 1-3 , the present invention provides a technical solution: an AC slow charging CP charging control and guidance circuit, including: A CP signal input terminal, a power supply wake-up module, a wake-up level sampling module, and a PWM signal sampling module; Among them, the CP signal input terminal is connected to the power supply wake-up module, the wake-up level sampling module, and the PWM signal sampling module.

[0022] It further includes an S2 switch, and the S2 switch is located between the CP signal input terminal and the power supply wake-up module, the wake-up level sampling module, and the PWM signal sampling module.

[0023] The S2 switch includes a diode D2, a resistor R2, a resistor R3, a control and guidance circuit switch S2, and an NMOS M1. The CP signal input terminal is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is connected to the resistor R2, the resistor R3, the power supply wake-up module, the wake-up level sampling module, and the PWM signal sampling module. The resistor R3 is grounded, the resistor R2 is connected to the pin 3 of the NMOS M1, the S2 switch is connected to the pin 1 of the NMOS M1, and the pin 2 of the NMOS M1 is grounded.

[0024] The wake-up level sampling module includes a resistor R6, a resistor R7, a resistor R8, and an MCU_AD_CPV. The negative electrode of the diode D2 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to one end of the resistor R7 and the resistor R8, the other end of the resistor R7 is grounded, and the other end of the resistor R8 is connected to the MCU_AD_CPV.

[0025] The power supply wake-up module includes a resistor R10 and a diode D1. One end of the resistor R10 is connected to the negative electrode of the diode D2, the other end of the resistor R10 is connected to the positive electrode of the diode D1, and the negative electrode of the diode D1 outputs to SBC_WAEK.

[0026] The PWM signal sampling module includes a resistor R4, a resistor R5, an NMOS M2, a resistor R9, a resistor R11, a resistor R12, a resistor R13, a resistor R14, MCU_PWM_CP, and a comparator U1A. One end of the resistor R4 is connected to the negative electrode of the diode D2, the other end of the resistor R4 is connected to one end of the resistor R5 and the pin 1 of the NMOS M2, the other end of the resistor R5 is connected to the pin 2 of the NMOS M2 and grounded, the pin 3 of the NMOS M2 is connected to one end of the resistor R9 and the negative input pin of the comparator U1A, the other end of the resistor R9 is connected to one end of the resistor R11, the other end of the resistor R11 is connected to the positive input pin of the comparator U1A and one end of the resistor R12, the other end of the resistor R12 is grounded, the negative power supply pin of the comparator U1A is grounded, the positive power supply pin of the comparator U1A is connected to one end of the resistor R11 and the resistor R13, the output pin of the comparator U1A is connected to one end of the resistor R14 and the other end of the resistor R13, and the other end of the resistor R14 is connected to MCU_PWM_CP.

[0027] Analysis of the above content: Such as Figure 1 shown, where the symbols specifically represent the following: CP_IN (CP signal input terminal): AC slow charge signal input port; Diode D2: CP input signal anti-reverse diode to prevent negative voltage from entering the system; R2, R3: Vehicle internal control guiding resistors; S2, M1: M1 is NMOS M1, and S2 is the vehicle internal control guiding circuit switch designed according to the requirements of Table 2 of the national standard; R4, R3: Digital PWM input voltage dividing resistors; M2: NMOS M2. When the digital input voltage is greater than the NMOS turn-on threshold, NMOS M2 is triggered to close; R9, R11, R12, U1A: Resistors R9, R11, and R12 are comparator U1A input level trigger judgment resistors; R13: Comparator U1A output pull-up resistor; R14: Digital acquisition current limiting resistor; MCU_PWM_CP: It is the digital acquisition port of the MCU; R6 and R7: They are the voltage-dividing resistors for level input acquisition; R8: It is the current-limiting resistor for input voltage sampling; MCU_AD_CPV: It is the AD sampling port of the MCU for voltage sampling R10: It is the current-limiting resistor for wake-up input; Diode D1: It is the input reverse protection diode to prevent affecting other wake-up sources inside the system and improve the stability of the wake-up signal.

[0028] The specific CP wake-up input analog acquisition process of this AC slow charging CP charging control and guidance circuit is as follows: When the slow charging gun is inserted, the slow charging pile inputs a 12V level signal, which is voltage-divided by resistor R6 and resistor R7 and then input to the MCU acquisition port MCU_AD_CPV; The sampling calculation formula of the said MCU_AD_CPV is as follows: MCU_AD_CPV = 12V * R7 / (R6 + R7).

[0029] The specific CP AC slow charging digital PWM acquisition process: When the slow charging gun is inserted, the slow charging pile inputs 12V, and then inputs 9V and 6V PWM digital signals; When a high level is input, it is voltage-divided by resistor R4 and resistor R5 to trigger the conduction of NMOS M2, pulling down the negative input pin of comparator U1A. When a low level is input, after voltage division by resistor R4 and resistor R5, it does not meet the conduction threshold of NMOS M2, so NMOS M2 does not conduct, and the negative input pin of comparator U1A is at a high level; VCC is voltage-divided by resistor R11 and resistor R12 to provide a reference voltage for the positive input pin of comparator U1A; Comparator U1A compares the voltages of the negative input pin and the positive input pin. When the voltage of the positive input pin > the voltage of the negative input pin, the output pin of comparator U1A outputs a high level; When the voltage of the positive input pin < the voltage of the negative input pin, the output pin of comparator U1A outputs a low level; Through the detected AD level and digital signals, the interaction with the charging pile is realized to achieve normal charging.

[0030] Digital acquisition truth table CP_IN IN+ and IN- OUT1 0 IN+<IN- 0 1 IN+ > IN- 1 Remark: 1: Represents a high level input; 0: Represents a low level input.

[0031] The calculation formula for the input voltage of the positive input pin of the comparator U1A is as follows: Voltage of the positive input pin = VCC * R12 / (R12 + R11).

[0032] The calculation of the input voltage of the NMOS M2 is as follows: Input voltage of the NMOS M2 = Voltage of the CP signal input terminal * R5 / (R5 + R4).

[0033] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0034] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An AC slow charging CP charging control and guiding circuit, characterized in that, Comprising: CP signal input terminal, power supply wake-up module, wake-up level acquisition module and PWM signal acquisition module; Wherein, the CP signal input terminal is connected to the power supply wake-up module, the wake-up level acquisition module and the PWM signal acquisition module.

2. The AC slow charging CP charging control and guidance circuit according to claim 1, wherein: It further includes an S2 switch, and the S2 switch is located between the CP signal input terminal and the power supply wake-up module, the wake-up level acquisition module, and the PWM signal acquisition module.

3. The AC slow charging CP charging control and guidance circuit according to claim 2, characterized in that: The S2 switch includes a diode D2, a resistor R2, a resistor R3, a control guide circuit switch S2, and an NMOS M1. The CP signal input terminal is connected to the positive electrode of the diode D2. The negative electrode of the diode D2 is connected to the resistor R2, the resistor R3, the power supply wake-up module, the wake-up level acquisition module, and the PWM signal acquisition module. The resistor R3 is grounded. The resistor R2 is connected to the pin 3 of the NMOS M1. The S2 switch is connected to the pin 1 of the NMOS M1. The pin 2 of the NMOS M1 is grounded.

4. A kind of AC slow charging CP charging control and guiding circuit according to claim 3, characterized in that: The wake-up level acquisition module includes a resistor R6, a resistor R7, a resistor R8, and an MCU_AD_CPV. The negative electrode of the diode D2 is connected to one end of the resistor R6. The other end of the resistor R6 is connected to one end of the resistor R7 and the resistor R8. The other end of the resistor R7 is grounded. The other end of the resistor R8 is connected to the MCU_AD_CPV.

5. The AC slow charging CP charging control and guidance circuit according to claim 4, characterized in that: The power supply wake-up module includes a resistor R10 and a diode D1. One end of the resistor R10 is connected to the negative electrode of the diode D2. The other end of the resistor R10 is connected to the positive electrode of the diode D1. The negative electrode of the diode D1 outputs to SBC_WAEK.

6. The AC slow charging CP charging control and guiding circuit according to claim 5, characterized in that: The PWM signal acquisition module includes a resistor R4, a resistor R5, an NMOS M2, a resistor R9, a resistor R11, a resistor R12, a resistor R13, a resistor R14, an MCU_PWM_CP, and a comparator U1A. One end of the resistor R4 is connected to the negative electrode of the diode D2. The other end of the resistor R4 is connected to one end of the resistor R5 and the pin 1 of the NMOS M2. The other end of the resistor R5 is connected to the pin 2 of the NMOS M2 and grounded. The pin 3 of the NMOS M2 is connected to one end of the resistor R9 and the negative input pin of the comparator U1A. The other end of the resistor R9 is connected to one end of the resistor R11. The other end of the resistor R11 is connected to the positive input pin of the comparator U1A and one end of the resistor R12. The other end of the resistor R12 is grounded. The negative power supply pin of the comparator U1A is grounded. The positive power supply pin of the comparator U1A is connected to one end of the resistor R11 and the resistor R13. The output pin of the comparator U1A is connected to one end of the resistor R14 and the other end of the resistor R13. The other end of the resistor R14 is connected to the MCU_PWM_CP.

7. The AC slow charging CP charging control and guidance circuit according to claim 6, characterized in that: The specific CP wake-up input analog quantity acquisition process of this AC slow charging CP charging control guide circuit is as follows: When the slow charging gun is inserted, the slow charging pile inputs a 12V level signal, which is divided by the resistor R6 and the resistor R7 and input to the MCU acquisition port MCU_AD_CPV; Specific CP AC slow charging digital PWM acquisition process: When the slow charging gun is inserted, the slow charging pile inputs 12V, and then inputs 9V and 6V PWM digital signals; When a high level is input, it is divided by resistor R4 and resistor R5 to trigger the conduction of NMOS M2, pulling down the negative input pin of comparator U1A. When a low level is input, it is divided by resistor R4 and resistor R5, and the conduction threshold of NMOS M2 is not met, so NMOS M2 does not conduct, and the negative input pin of comparator U1A is at a high level; VCC is divided by resistor R11 and resistor R12 to provide a reference voltage for the positive input pin of comparator U1A; Comparator U1A compares the voltages of the negative input pin and the positive input pin. When the voltage of the positive input pin > the voltage of the negative input pin, the output pin of comparator U1A outputs a high level; When the voltage of the positive input pin < the voltage of the negative input pin, the output pin of comparator U1A outputs a low level; Through the detected AD level and digital signal, the interaction with the charging pile is realized to achieve normal charging.

8. A kind of AC slow charging CP charging control and guiding circuit according to claim 7, characterized in that: The sampling calculation formula of the MCU_AD_CPV is as follows: MCU_AD_CPV = 12V * R7 / (R6 + R7).

9. The AC slow charging CP charging control and guidance circuit according to claim 7, characterized in that: The calculation formula of the input voltage of the positive input pin of comparator U1A is as follows: Positive input pin voltage = VCC * R12 / (R12 + R11).

10. A CP charging control and guiding circuit for AC slow charging according to claim 7, characterized in that: The input voltage calculation of the NMOS M2: Input voltage of NMOS M2 = Input voltage of CP signal input terminal * R5 / (R5 + R4).

Images