A charging control pilot signal processing and recognition method and circuit

Abstract

The application discloses a charging control guide signal processing and identification method and circuit, and relates to the technical field of electric vehicle charging control. After the CP control guide signal is rectified through a pre-rectifier diode D6, the first path is divided by a resistor and then sent to an amplitude acquisition circuit, and an acquisition voltage is output. A compensation diode D8 with the same model as the pre-rectifier diode D6 is selected to build an independent compensation sampling reference branch. The compensation sampling reference branch collects the forward voltage drop of the compensation diode D8 in real time through a voltage follower circuit and outputs a sampling signal. The acquisition voltage and the forward voltage drop of the compensation diode D8 corresponding to the sampling signal are obtained, and are substituted into a compensation calculation formula for dynamic correction to obtain the real CP port voltage corresponding to the CP control guide signal. The application solves the problem that the traditional scheme calculates the CP port voltage by using the fixed forward voltage drop of the rectifier diode for operation, and the CP control guide signal recognition accuracy is poor.

Description

Technical Field

[0001] This application relates to the field of electric vehicle charging control technology, and in particular to a charging control guidance signal processing and identification method and circuit. Background Technology

[0002] In the field of new energy vehicles, charging safety is a core concern of the industry. As the core carrier for the interaction between charging piles and electric vehicles, the CP control guidance signal undertakes many key functions such as connection status monitoring, charging pile rated charging current indication, charging triggering, charging system wake-up and fault warning. Its processing accuracy and recognition effect directly determine the safety, stability and reliability of the charging process.

[0003] Currently, conventional CP signal processing solutions generally perform rectification, voltage division, and voltage tracking preprocessing on the CP AC signal input from the charging pile before the subsequent stage acquires the amplitude, frequency, and duty cycle. Taking CN120223075A as an example, it adopts a conventional signal conditioning architecture of rectification, voltage division, and voltage tracking, which can realize basic CP signal acquisition functions. This solution does not have a dedicated temperature compensation mechanism. The forward voltage drop of the rectifier diodes in the circuit can only participate in voltage calculation according to the industry-standard fixed typical value, which cannot compensate for the error caused by temperature drift.

[0004] Therefore, traditional solutions use a fixed forward voltage drop of the rectifier diode in the calculation of the CP port voltage, which cannot be dynamically corrected. This results in large deviations and low acquisition accuracy of voltage sampling results under high and low temperature conditions, which seriously affects the accuracy of CP control guidance signal recognition and cannot meet the requirements of reliable charging of vehicles in all temperature ranges. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, this application provides a charging control guidance signal processing and identification method to solve the problems existing in the background art.

[0006] In a first aspect, this application provides a method for processing and identifying charging control guidance signals, used by an on-board charging controller to collect CP control guidance signals output by a charging pile, including: a CP control guidance signal input to the CP port; wherein the CP control guidance signal is a fixed-level signal or a PWM pulse signal; after the CP control guidance signal is rectified by a pre-rectifier diode D6, its first path is divided by a resistor and sent to an amplitude acquisition circuit to output an acquisition voltage; an independent compensation sampling reference branch is constructed by selecting a compensation diode D8 of the same model as the pre-rectifier diode D6, and the compensation sampling reference branch collects the forward voltage drop of the compensation diode D8 in real time through a voltage follower circuit and outputs a sampling signal; the acquisition voltage and the forward voltage drop of the compensation diode D8 corresponding to the sampling signal are obtained, substituted into the compensation calculation formula for dynamic correction, and the actual CP port voltage corresponding to the CP control guidance signal is obtained.

[0007] In one possible implementation, the CP control guide signal is rectified by the pre-rectifier diode D6, and then its second path is connected to a hysteresis comparator circuit. The hysteresis interval blocks interference and binarizes the CP control guide signal to output a level signal with no glitches. The level signal is connected to the subsequent acquisition port to acquire the frequency and duty cycle of the CP control guide signal.

[0008] In one possible implementation, the compensation calculation formula includes: ;in, This is the actual CP port voltage. To collect voltage, This is a series voltage divider resistor placed before the amplitude acquisition circuit and the hysteresis comparator circuit. This is a grounding voltage divider resistor placed before the amplitude acquisition circuit and the hysteresis comparator circuit. To compensate for the forward voltage drop of diode D8, the pre-rectifier diode D6, the post-rectifier diode D7 in the amplitude acquisition circuit, and the compensation diode D8 are all of the same type, satisfying the requirements. ;in, This is the forward voltage drop of the front-side rectifier diode D6. This is the forward voltage drop of the rear rectifier diode D7.

[0009] In one possible implementation, the calculation method for the acquired voltage includes: ;in, To collect voltage, This is the actual CP port voltage. This is the forward voltage drop of the front-side rectifier diode D6. This is a series voltage divider resistor placed before the amplitude acquisition circuit and the hysteresis comparator circuit. This is a grounding voltage divider resistor placed before the amplitude acquisition circuit and the hysteresis comparator circuit. This is the forward voltage drop of the rear rectifier diode D7.

[0010] Secondly, this application provides a charging control guidance signal processing and identification circuit, including a pre-rectifier circuit, a common voltage divider unit, an amplitude acquisition circuit, a hysteresis comparator circuit, and a compensation sampling reference branch; the pre-rectifier circuit only has a pre-rectifier diode D6, and the CP control guidance signal input at the CP port is connected to the anode of the pre-rectifier diode D6, and after rectification by the pre-rectifier diode D6, it is output from the cathode of the pre-rectifier diode D6; the common voltage divider unit includes a series voltage divider resistor R12 and a ground voltage divider resistor R15; one end of the series voltage divider resistor R12 is connected to the cathode of the pre-rectifier diode D6, and the other end is simultaneously connected to the upper end of the ground voltage divider resistor R15, the input terminal of the amplitude acquisition circuit, and the hysteresis comparator circuit. The input terminal of the hysteresis comparator circuit; the lower end of the grounded voltage divider resistor R15 is grounded, and the series voltage divider resistor R12 and the grounded voltage divider resistor R15 are arranged after the pre-rectifier circuit and before the amplitude acquisition circuit and the hysteresis comparator circuit; the amplitude acquisition circuit is connected to the voltage divider node of the common voltage divider unit and outputs the acquired voltage; the hysteresis comparator circuit is connected to the voltage divider node of the common voltage divider unit, relies on the hysteresis interval to block interference and performs binarization processing on the CP control guide signal, and outputs a level signal with no glitches on the edge; the compensation sampling reference branch is equipped with a compensation diode D8 of the same model as the pre-rectifier diode D6 and a voltage follower circuit. The voltage follower circuit acquires the forward voltage drop of the compensation diode D8 in real time and outputs the sampling signal.

[0011] In one possible implementation, the amplitude acquisition circuit includes an operational amplifier U2.1, a post-rectifier diode D7, a filter capacitor C2, and a filter resistor R20; the inverting input terminal of the operational amplifier U2.1 is shorted to its own output terminal to form a voltage follower, and the non-inverting input terminal of the operational amplifier U2.1 is connected to a common voltage divider node; the output terminal of the operational amplifier U2.1 is connected to a filter circuit composed of a filter capacitor C2 and a filter resistor R20 after passing through the post-rectifier diode D7, and the output terminal of the filter circuit outputs the acquisition voltage.

[0012] In one possible implementation, the hysteresis comparator circuit includes an operational amplifier U2.4, resistors R16, R17, R18, and R19. The voltage divider node is connected to the non-inverting input of the operational amplifier U2.4 through resistor R17, the reference voltage is connected to the inverting input of the operational amplifier U2.4 through resistor R18, one end of resistor R19 is connected to the inverting input of the operational amplifier U2.4, and the other end is grounded. Resistor R16 is connected across the output and non-inverting input of the operational amplifier U2.4 to form hysteresis feedback, and the output of the operational amplifier U2.4 outputs a level signal.

[0013] In one possible implementation, the voltage follower circuit of the compensation sampling reference branch includes an operational amplifier U2.3; the power supply is connected to the anode of the compensation diode D8 via resistor R21, the cathode of the compensation diode D8 is grounded, and the connection node between the compensation diode D8 and resistor R21 is connected to the non-inverting input terminal of the operational amplifier U2.3; the inverting input terminal of the operational amplifier U2.3 is shorted to its own output terminal to form a voltage follower, and the output terminal of the operational amplifier U2.3 outputs the sampling signal.

[0014] Thirdly, embodiments of this application provide an on-board charging controller, including a memory and a processor; the memory is used to store computer-executable instructions; the processor is used to execute the computer-executable instructions to implement the method described in the first aspect or any possible implementation of the first aspect.

[0015] Fourthly, embodiments of this application provide a computer-readable storage medium storing executable instructions, which, when executed by a computer, enable the method described in the first aspect or any possible implementation thereof.

[0016] The beneficial effects of this application are as follows: This application adds an independent compensation sampling reference branch, and uses a compensation diode of the same model as the pre-rectifier diode to synchronously collect the real-time forward voltage drop. The dynamic voltage drop parameter is substituted into the compensation calculation formula to dynamically correct the voltage. Unlike traditional solutions that use fixed diode voltage drop calculations and rely on temperature sensors or manual high and low temperature calibration compensation, this solution does not require additional temperature measuring devices, point-by-point calibration, or software table lookup, thus offsetting the voltage drop offset caused by temperature changes in principle. This application processes the rectified CP control guidance signal into two paths: one path is used for amplitude acquisition and outputs the acquired voltage, and the other path completes signal binarization through a hysteresis comparator circuit. By utilizing the hysteresis range of the hysteresis comparator, electromagnetic interference and voltage jitter are effectively shielded, and a level signal with no glitches is output, which greatly improves the acquisition accuracy of the CP control guidance signal frequency and duty cycle, making it suitable for complex outdoor interference conditions in vehicles. Attached Figure Description

[0017] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a flowchart illustrating a charging control guidance signal processing and identification method provided in an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of a charging control guidance signal processing and identification circuit provided in an embodiment of this application.

[0020] Figure 3 This is a schematic diagram of an on-board charging controller provided in an embodiment of this application. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] In the field of new energy vehicles, charging safety is a core concern for the industry. The CP control guidance signal, as the core carrier for interaction between charging piles and electric vehicles, undertakes multiple key functions, including connection status monitoring, charging pile rated charging current indication, charging triggering, charging system wake-up, and fault warning. Its processing accuracy and recognition effect directly determine the safety, stability, and reliability of the charging process. Outdoor charging conditions for electric vehicles are complex and environmentally variable, placing stringent requirements on the stability of signal acquisition and processing. Deviations in the acquisition and processing of CP control guidance signals can not only affect the normal operation of the entire vehicle charging system but may also lead to safety accidents in severe cases. Therefore, achieving high-precision and high-stability acquisition and processing of CP control guidance signals is of great significance.

[0023] This application provides a method for processing and identifying charging control guidance signals, used by an on-board charging controller to collect the CP control guidance signals output by a charging pile. This method is applicable to electric vehicles, electric two-wheelers / tricycles, and other devices with plug-in charging capabilities. It collects, conditions, performs temperature compensation, and identifies the CP control guidance signals output by the charging pile, ensuring sampling accuracy under harsh conditions such as complex electromagnetic interference and high / low temperatures, while reducing the data processing load on the on-board MCU.

[0024] like Figure 1 As shown, a charging control guidance signal processing and identification method includes steps S101 to S104. Wherein, Figure 1 This is merely one execution order shown in the embodiments of this application and does not represent the only execution order of a charging control guidance signal processing and identification method. Where the final result can be achieved, Figure 1 The steps shown can be performed in parallel or in reverse order.

[0025] S101: CP control pilot signal input to the CP port. The CP control pilot signal can be a fixed-level signal or a PWM pulse signal.

[0026] Specifically, the fixed voltage level and the PWM signal belong to the fixed process in the charging process. After the charging gun is inserted, the CP signal source built into the charging pile is a fixed 12V level. The built-in resistor and the circuit of the vehicle charging controller form a voltage divider. After the charging pile detects a valid voltage change, it will change the fixed voltage level to a PWM signal.

[0027] Specifically, the PWM pulse signal is set with various duty cycles, which are used to characterize different rated output currents of the charging pile. The fixed-level signal is a constant DC voltage used to indicate the vehicle-charging pile connection status, charging ready status, and fault status.

[0028] S102: After the CP control guidance signal is rectified by the pre-rectifier diode D6, its first path is sent to the amplitude acquisition circuit after being divided by a resistor, and the acquisition voltage is output.

[0029] Specifically, the CP control pilot signal voltage range is -12V to 12V. The CP control pilot signal is rectified by the pre-rectifier diode D6. The rectified signal is transmitted in two paths. The first path is converted by a common voltage divider unit consisting of a series voltage divider resistor R12 and a ground voltage divider resistor R15 to adapt the signal amplitude to the operating range of the amplitude acquisition circuit before being sent to the amplitude acquisition circuit to output the acquisition voltage.

[0030] Specifically, the amplitude acquisition circuit uses operational amplifier U2.1 as a voltage follower. With high input impedance and low output impedance, it decouples the preceding and following stages, avoiding mutual interference and ensuring that the voltage at the voltage divider node is transmitted completely and without loss to the subsequent stage. The output of operational amplifier U2.1 is connected to a filter circuit composed of filter capacitor C2 and filter resistor R20 after passing through a post-rectifier diode D7. This effectively filters out high-frequency noise in the signal, outputting a stable acquisition voltage. This allows the subsequent ADC acquisition port to obtain reliable voltage information with only simple filtering, significantly reducing the software processing load on the MCU.

[0031] S103: Select a compensation diode D8 with the same model as the pre-rectifier diode D6 to build an independent compensation sampling reference branch. The compensation sampling reference branch collects the forward voltage drop of the compensation diode D8 in real time through a voltage follower circuit and outputs a sampling signal.

[0032] Specifically, the compensation sampling reference branch is an independent parallel branch, arranged on the same circuit board as the CP control pilot signal processing branch, and both are in the same temperature environment. The compensation sampling reference branch does not participate in the transmission, rectification, and voltage division process of the CP control pilot signal; it is only used to sample the real-time forward voltage drop of the compensation diode D8 to provide compensation parameters for the voltage calculation of the CP control pilot signal.

[0033] Specifically, this application sets up an independent compensation sampling reference branch, the core purpose of which is to solve the problem of significant drift of the diode forward voltage drop with temperature. Since the forward voltage drop difference of the rectifier diode can reach 0.3V under operating conditions of -40℃ and 85℃, this difference exceeds 30% compared to the ±1V and ±0.8V effective reference ranges corresponding to the national and European standards for CP control guidance signals. If a fixed voltage drop value is used to calculate the true CP port voltage, it will cause sampling inaccuracy. This application uses a compensation diode D8 of the same model as the pre-rectifier diode D6 for benchmarking and acquisition. Both operate in the same environment and have completely synchronized temperature characteristics. Then, a voltage follower circuit accurately acquires the real-time forward voltage drop of the compensation diode D8. This method eliminates the need for additional temperature sensors and manual point-by-point calibration, and can restore the true voltage drop of the pre-rectifier diode D6 in real time, providing accurate parameters for subsequent voltage compensation calculations and fundamentally eliminating the influence of temperature on signal acquisition accuracy.

[0034] S104: Obtain the forward voltage drop of the compensation diode D8 corresponding to the sampled voltage and the sampled signal, substitute it into the compensation calculation formula for dynamic correction, and obtain the actual CP port voltage corresponding to the CP control guidance signal.

[0035] Specifically, this application uses the forward voltage drop of the compensation diode D8 corresponding to the sampled signal as a calculation parameter in dynamic calculation to offset the effect of temperature on the forward voltage drop of the diode.

[0036] The compensation calculation formula includes: .in, This is the actual CP port voltage. To collect voltage, This is a series voltage divider resistor placed before the amplitude acquisition circuit and the hysteresis comparator circuit. This is a grounding voltage divider resistor placed before the amplitude acquisition circuit and the hysteresis comparator circuit. To compensate for the forward voltage drop of diode D8.

[0037] The calculation methods for the acquired voltage include: .in, To collect voltage, This is the actual CP port voltage. This is the forward voltage drop of the front-side rectifier diode D6. This is a series voltage divider resistor placed before the amplitude acquisition circuit and the hysteresis comparator circuit. This is a grounding voltage divider resistor placed before the amplitude acquisition circuit and the hysteresis comparator circuit. This is the forward voltage drop of the rear rectifier diode D7.

[0038] The derivation process is as follows. , .

[0039] The pre-rectifier diode D6, the post-rectifier diode D7 in the amplitude acquisition circuit, and the compensation diode D8 are all diodes of the same type, which meets the requirements. .in, This is the forward voltage drop of the front-side rectifier diode D6. This is the forward voltage drop of the rear rectifier diode D7.

[0040] Will , Replace with real-time data. ,Right now .

[0041] When the ambient temperature changes, the forward voltage drop of the front rectifier diode D6... The voltage drop will change synchronously. If a fixed voltage drop value is used during the calculation, the final amplitude signal will also deviate. This solution utilizes the consistent temperature change characteristics of diodes of the same model, and uses the real-time voltage drop collected by the compensation diode D8 to replace the fixed value in the calculation, which can completely eliminate the influence of temperature on the accuracy of the acquisition.

[0042] Specifically, by using the above compensation calculation instead of the traditional method of using a fixed voltage drop value, the voltage deviation caused by temperature changes can be eliminated across the entire temperature range, significantly improving the acquisition accuracy of the CP port voltage without relying on software table lookup or complex temperature calibration procedures.

[0043] This application also includes: after the CP control guide signal is rectified by the pre-rectifier diode D6, its second path is connected to a hysteresis comparator circuit. The hysteresis interval blocks interference and binarizes the CP control guide signal, outputting a level signal with smooth edges. This level signal is connected to the subsequent acquisition port to acquire the frequency and duty cycle of the CP control guide signal.

[0044] The post-stage acquisition port refers to the timer input capture pin of the microcontroller (MCU) or processor, which is used to acquire the frequency and duty cycle of the CP control pilot signal.

[0045] Specifically, the rectified CP control guide signal second path is sequentially converted by a common voltage divider unit composed of series voltage divider resistor R12 and ground voltage divider resistor R15 to adapt the signal amplitude to the operating range of the hysteresis comparator circuit before being sent to the hysteresis comparator circuit.

[0046] Specifically, binarization converts a continuously changing analog voltage signal into a digital level signal containing only high and low states, eliminating signal fluctuations and noise, and ultimately outputting a level signal with smooth edges.

[0047] Specifically, the hysteresis comparator circuit includes operational amplifier U2.4, resistors R16, R17, R18, and R19. By setting an appropriate hysteresis range, false triggering caused by electromagnetic interference, voltage fluctuations, and other factors can be effectively prevented, resulting in a glitched output signal and significantly improving the reliability of the subsequent acquisition port in acquiring the frequency and duty cycle of the CP control guide signal.

[0048] This application also provides a charging control guidance signal processing and identification circuit, such as... Figure 2 As shown, it includes a pre-rectifier circuit, a common voltage divider unit, an amplitude acquisition circuit, a hysteresis comparator circuit, and a compensation sampling reference branch.

[0049] It should be noted that, Figure 2 In the diagram, CP-Port is the CP port, which receives the CP control pilot signal. PortA is the output of the amplitude acquisition circuit, outputting the acquired voltage. PortB is the output of the hysteresis comparator circuit, outputting a glitched-edge level signal used for frequency and duty cycle acquisition. PortC is the output of the compensation sampling reference branch, outputting the sampling signal corresponding to the forward voltage drop of compensation diode D8.

[0050] The pre-rectifier circuit only has a pre-rectifier diode D6. The CP control signal input at the CP port is connected to the anode of the pre-rectifier diode D6, and after being rectified by the pre-rectifier diode D6, it is output from the cathode of the pre-rectifier diode D6.

[0051] The common voltage divider unit includes a series voltage divider resistor R12 and a ground voltage divider resistor R15.

[0052] One end of the series voltage divider resistor R12 is connected to the cathode of the pre-rectifier diode D6, and the other end is connected to the upper end of the ground voltage divider resistor R15, the input terminal of the amplitude acquisition circuit, and the input terminal of the hysteresis comparator circuit.

[0053] The lower end of the grounding voltage divider resistor R15 is grounded. The series voltage divider resistor R12 and the grounding voltage divider resistor R15 are arranged after the pre-rectifier circuit and before the amplitude acquisition circuit and the hysteresis comparator circuit.

[0054] The amplitude acquisition circuit is connected to the voltage divider node of the common voltage divider unit and outputs the acquisition voltage.

[0055] The amplitude acquisition circuit includes an operational amplifier U2.1, a post-rectifier diode D7, a filter capacitor C2, and a filter resistor R20.

[0056] The inverting input of operational amplifier U2.1 is shorted to its own output to form a voltage follower, and the non-inverting input of operational amplifier U2.1 is connected to a common voltage divider node.

[0057] The output of operational amplifier U2.1 is connected to a filter circuit consisting of filter capacitor C2 and filter resistor R20 after passing through a post-rectifier diode D7. The output of the filter circuit outputs the sampled voltage.

[0058] The hysteresis comparator circuit is connected to the voltage divider node of the common voltage divider unit. It relies on the hysteresis interval to block interference and binarizes the CP control guide signal to output a level signal with no glitches.

[0059] The hysteresis comparator circuit includes operational amplifier U2.4, resistors R16, R17, R18, and R19.

[0060] The voltage divider node is connected to the non-inverting input of operational amplifier U2.4 via resistor R17. The reference voltage is connected to the inverting input of operational amplifier U2.4 via resistor R18. One end of resistor R19 is connected to the inverting input of operational amplifier U2.4, and the other end is grounded.

[0061] Resistor R16 is connected across the output and non-inverting input of operational amplifier U2.4 to form hysteresis feedback, and the output of operational amplifier U2.4 outputs a level signal.

[0062] The compensation sampling reference branch is equipped with a compensation diode D8 of the same model as the pre-rectifier diode D6 and a voltage follower circuit. The voltage follower circuit acquires the forward voltage drop of the compensation diode D8 in real time and outputs the sampling signal.

[0063] The voltage follower circuit of the compensated sampling reference branch includes operational amplifier U2.3.

[0064] The power supply is connected to the anode of the compensation diode D8 via resistor R21. The cathode of the compensation diode D8 is grounded. The connection node between the compensation diode D8 and resistor R21 is connected to the non-inverting input terminal of the operational amplifier U2.3.

[0065] The inverting input of operational amplifier U2.3 is shorted to its own output to form a voltage follower, and the output of operational amplifier U2.3 outputs a sampling signal.

[0066] The methods described in this application can be implemented in any suitable manner using computer-readable program code. For example, the controller can take the form of a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro)processor, logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers, and embedded microcontrollers. Examples of controllers include, but are not limited to, the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicon Labs C8051F320. A memory controller can also be implemented as part of the control logic of a memory. Those skilled in the art will also recognize that, in addition to implementing the controller in purely computer-readable program code form, the same functionality can be achieved by logically programming the method steps to make the controller take the form of logic gates, switches, ASICs, programmable logic controllers, and embedded microcontrollers. Therefore, such a controller can be considered a hardware component, and the means included within it for implementing various functions can also be considered as structures within the hardware component. Alternatively, the device used to implement various functions can be viewed as either a software module that implements the method or a structure within a hardware component.

[0067] like Figure 3 As shown in the figure, this application embodiment also provides an on-board charging controller, including a memory 301 and a processor 302; the memory 301 is used to store computer-executable instructions; the processor 302 is used to execute the computer-executable instructions to implement the charging control guidance signal processing and recognition method described above in this application embodiment.

[0068] This application also provides a computer-readable storage medium storing executable instructions. When a computer executes the executable instructions, it can implement the charging control guidance signal processing and identification method described above in this application.

[0069] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary hardware. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product, or it can be embodied in the process of data migration. The computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, mobile terminal, server, or network device, etc.) to execute the methods described in the embodiments of this application.

[0070] The various embodiments described in this specification are presented in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. All or part of this application can be used in numerous general-purpose or special-purpose computer system environments or configurations.

[0071] The above embodiments are only for illustrating the technical concept and features of this application. Their purpose is to enable those skilled in the art to understand the content of this application and implement it. They should not be used to limit the scope of protection of this application. All equivalent changes or modifications made in accordance with the spirit and essence of this application should be covered within the scope of protection of this application.

Claims

1. A method for processing and recognizing charging control guidance signals, used by an on-board charging controller to collect CP control guidance signals output by a charging pile, characterized in that, include: The CP control guide signal is input to the CP port; wherein, the CP control guide signal is a fixed level signal or a PWM pulse signal; After the CP control guidance signal is rectified by the pre-rectifier diode D6, its first path is divided by a resistor and then sent to the amplitude acquisition circuit to output the acquisition voltage. An independent compensation sampling reference branch is constructed by selecting a compensation diode D8 with the same model as the pre-rectifier diode D6. The compensation sampling reference branch collects the forward voltage drop of the compensation diode D8 in real time through a voltage follower circuit and outputs a sampling signal. The forward voltage drop of the compensation diode D8 corresponding to the sampled voltage and the sampled signal is obtained, and then substituted into the compensation calculation formula for dynamic correction to obtain the actual CP port voltage corresponding to the CP control guidance signal. The compensation calculation formula includes: ;in, This is the actual CP port voltage. To collect voltage, This is a series voltage divider resistor placed before the amplitude acquisition circuit and the hysteresis comparator circuit. This is a grounding voltage divider resistor placed before the amplitude acquisition circuit and the hysteresis comparator circuit. To compensate for the forward voltage drop of diode D8; The pre-rectifier diode D6, the post-rectifier diode D7 in the amplitude acquisition circuit, and the compensation diode D8 are all diodes of the same type, which meets the requirements. ;in, This is the forward voltage drop of the front rectifier diode D6. This is the forward voltage drop of the rear rectifier diode D7; The calculation methods for the acquired voltage include: ;in, To collect voltage, This is the actual CP port voltage. This is the forward voltage drop of the front rectifier diode D6. This is a series voltage divider resistor placed before the amplitude acquisition circuit and the hysteresis comparator circuit. This is a grounding voltage divider resistor placed before the amplitude acquisition circuit and the hysteresis comparator circuit. This is the forward voltage drop of the rear rectifier diode D7.

2. The charging control guidance signal processing and identification method according to claim 1, characterized in that, Also includes: After the CP control pilot signal is rectified by the pre-rectifier diode D6, its second path is connected to the hysteresis comparator circuit. The hysteresis interval blocks interference and binarizes the CP control pilot signal to output a level signal with no glitches. The level signal is connected to the subsequent acquisition port to acquire the frequency and duty cycle of the CP control guide signal.

3. The charging control guidance signal processing and identification method according to any one of claims 1-2, comprising a pre-rectifier circuit, a common voltage divider unit, an amplitude acquisition circuit, a hysteresis comparator circuit, and a compensation sampling reference branch; The pre-rectifier circuit only has a pre-rectifier diode D6. The CP control signal input at the CP port is connected to the anode of the pre-rectifier diode D6, and after being rectified by the pre-rectifier diode D6, it is output from the cathode of the pre-rectifier diode D6. The common voltage divider unit includes a series voltage divider resistor R12 and a ground voltage divider resistor R15; One end of the series voltage divider resistor R12 is connected to the cathode of the pre-rectifier diode D6, and the other end is connected to the upper end of the ground voltage divider resistor R15, the input terminal of the amplitude acquisition circuit, and the input terminal of the hysteresis comparator circuit. The lower end of the grounding voltage divider resistor R15 is grounded. The series voltage divider resistor R12 and the grounding voltage divider resistor R15 are arranged after the pre-rectifier circuit and before the amplitude acquisition circuit and the hysteresis comparator circuit. The amplitude acquisition circuit is connected to the voltage divider node of the common voltage divider unit and outputs the acquisition voltage; The hysteresis comparator circuit is connected to the voltage divider node of the common voltage divider unit. It relies on the hysteresis interval to block interference and binarize the CP control guide signal to output a level signal with no glitches at the edge. The compensation sampling reference branch is equipped with a compensation diode D8 of the same model as the pre-rectifier diode D6 and a voltage follower circuit. The voltage follower circuit acquires the forward voltage drop of the compensation diode D8 in real time and outputs the sampling signal.

4. The charging control guidance signal processing and identification method according to claim 3, characterized in that, The amplitude acquisition circuit includes an operational amplifier U2.1, a post-rectifier diode D7, a filter capacitor C2, and a filter resistor R20; The inverting input of operational amplifier U2.1 is shorted to its own output to form a voltage follower, and the non-inverting input of operational amplifier U2.1 is connected to a common voltage divider node; The output of operational amplifier U2.1 is connected to a filter circuit consisting of filter capacitor C2 and filter resistor R20 after passing through a post-rectifier diode D7. The output of the filter circuit outputs the sampled voltage.

5. The charging control guidance signal processing and identification method according to claim 3, characterized in that, The hysteresis comparator circuit includes operational amplifier U2.4, resistors R16, R17, R18, and R19; The voltage divider node is connected to the non-inverting input of operational amplifier U2.4 via resistor R17, the reference voltage is connected to the inverting input of operational amplifier U2.4 via resistor R18, one end of resistor R19 is connected to the inverting input of operational amplifier U2.4, and the other end is grounded; Resistor R16 is connected across the output and non-inverting input of operational amplifier U2.4 to form hysteresis feedback, and the output of operational amplifier U2.4 outputs a level signal.

6. The charging control guidance signal processing and identification method according to claim 3, characterized in that, The voltage follower circuit of the compensation sampling reference branch includes operational amplifier U2.3; The power supply is connected to the anode of the compensation diode D8 via resistor R21, the cathode of the compensation diode D8 is grounded, and the connection node between the compensation diode D8 and resistor R21 is connected to the non-inverting input terminal of the operational amplifier U2.

3. The inverting input of operational amplifier U2.3 is shorted to its own output to form a voltage follower, and the output of operational amplifier U2.3 outputs a sampling signal.

7. An on-board charging controller, characterized in that, Including memory and processor; The memory is used to store computer-executable instructions; The processor is configured to execute the computer-executable instructions to implement the method according to any one of claims 1-6.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores executable instructions, which, when executed by a computer, enable the implementation of the method as described in any one of claims 1-6.

Images