Control guide signal generation and detection circuit suitable for multi-standard charging pile

Abstract

The utility model relates to a control guide signal generation and detection circuit suitable for a multi-standard charging pile, and relates to the technical field of charging pile detection. Through the high-frequency filtering of the relay control module, the voltage amplitude matching of the PWM isolation transmitting module, the positive and negative voltage signal separation of the voltage conditioning module, the digital processing of the signal conversion module, the signal isolation of the digital communication isolation module and the independent power supply of the power supply isolation module, all the modules work cooperatively, and under the condition of analog isolation, the power supply isolation module can carry out analog isolation. The accuracy of the acquired voltage of the control guide signal can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of charging pile detection, in particular to a control guide signal generation and detection circuit for a multi-standard charging pile. Background Art

[0002] With the rapid development of new energy vehicles, the construction of charging infrastructure is also becoming more and more perfect. In order to realize intelligent and convenient charging services, charging piles need to achieve interconnection with vehicles. At present, the charging standards for new energy vehicles are mainly concentrated in national standards, European standards and American standards. Although the charging guidance types of different charging standards are different, the basic principles of charging control guidance are the same. The charging pile sends a specified voltage or PMW through the control guide line, and the vehicle side detects the voltage or PWM, identifies the state, and feeds back the level voltage of the control guide line to the charging pile state. The charging pile detects the voltage fed back by the vehicle side to control the charging timing.

[0003] In order to ensure the normal charging of new energy vehicles, the charging pile needs to detect the negative pressure in the charging control guide wire in real time. In the related technology, analog isolation solutions are often used to collect the voltage of the control guide wire, which can not only avoid the high-voltage coupling interference between the control guide wire and the high-voltage output line, but also avoid the fluctuation caused by the interference of the common PE (shell ground), and has better isolation performance. However, in practice, in order to control costs, ordinary isolation optocouplers are generally used, which have poor linearity, making the compensation algorithm of the collected voltage more difficult to process, making the collected voltage inaccurate. Utility Model Content

[0004] The present application provides a control guidance signal generation and detection circuit applicable to multi-standard charging piles, which can improve the accuracy of collected control guidance signals.

[0005] The present application provides a control guidance signal generation and detection circuit applicable to multi-standard charging piles, which adopts the following technical solutions:

[0006] The circuit includes a relay control module, a PWM isolation transmission module, a signal conditioning module, a signal conversion module, a digital communication isolation module and a power isolation module, wherein:

[0007] The relay control module is connected to the first signal port of the charging pile, and the relay control module is used to filter the high-frequency signal in the first control guide signal of the first signal port to obtain a second control guide signal;

[0008] The PWM isolation and transmission module is connected to the main control end and the relay control module respectively, and the PWM control module is used to convert the first PWM signal of the main control end into a second PWM signal with the same voltage amplitude as the second control guide signal, and the frequency and duty cycle of the first PWM signal and the second PWM signal are the same;

[0009] The voltage conditioning module is connected to the PWM transmission module, and the voltage conditioning module is used to separate the second control pilot signal into a positive pressure signal and a negative pressure signal according to the second PWM signal;

[0010] The signal conversion module is connected to the second signal port of the charging pile and the voltage conditioning module respectively, and the signal conversion module is used to collect the connection guide signal of the second signal port, and the positive pressure signal and the negative pressure signal transmitted by the voltage conditioning module, and convert the positive pressure signal, the negative pressure signal and the connection guide signal into a first serial data signal and a first serial clock signal in the form of a digital signal;

[0011] The digital communication isolation module is connected to the main control end and the signal conversion module respectively, and is used to isolate the first serial data signal and the first serial clock signal, generate a second serial data signal and a second serial clock signal, and transmit the second serial data signal and the second serial clock signal to the main control end.

[0012] The power isolation module is respectively connected to the main control end, the PWM isolation and transmission module, the signal conditioning module, the signal conversion module and the digital communication isolation module, and the power isolation module is used to isolate and convert the power supply voltage of the main control end into the power supply voltage of the PWM isolation and transmission module, the signal conditioning module, the signal conversion module and the digital communication isolation module.

[0013] In a preferred example, the present invention can be further configured as follows: the power isolation module includes a power isolation chip, a power conversion chip, a first capacitor, a second capacitor, a fourth capacitor and a fifth capacitor, wherein:

[0014] The voltage input terminal of the power isolation chip is connected to the power supply of the main control terminal, the ground terminal of the power isolation chip is grounded, and the zero output terminal of the power isolation chip is grounded;

[0015] One end of the first capacitor and the second capacitor are connected in parallel to the positive voltage output end of the power isolation chip, and the other end of the first capacitor and the second capacitor are connected in parallel to the ground;

[0016] One end of the fourth capacitor and the fifth capacitor is connected in parallel to the negative voltage output end of the power isolation chip, and the other end of the fourth capacitor and the fifth capacitor is connected in parallel to the ground;

[0017] The positive voltage output terminal and the negative voltage output terminal of the power isolation chip are respectively connected to the positive voltage input terminal and the negative voltage input terminal of the power conversion chip, and the voltage output terminal of the power conversion chip is respectively connected to the PWM isolation transmission module, the signal conditioning module, the signal conversion module and the digital communication isolation module.

[0018] In a preferred example, the present invention can be further configured as follows: the signal conversion module includes a signal conversion chip, a first resistor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a third capacitor, and a sixth capacitor, wherein:

[0019] The 0-channel analog end of the signal conversion chip is connected to the cathode of the first diode, the anode of the first diode is grounded, the 0-channel analog end of the signal conversion chip is connected to the anode of the second diode, and the cathode of the second diode is connected to the power isolation module;

[0020] The 1-channel analog terminal of the signal conversion chip is connected to the cathode of the fifth diode, the anode of the fifth diode is grounded, the 1-channel analog terminal of the signal conversion chip is connected to the anode of the sixth diode, and the cathode of the sixth diode is connected to the power isolation module;

[0021] The 0-channel analog terminal and the 1-channel analog terminal of the signal conversion chip are connected to the voltage conditioning module;

[0022] The power supply end of the signal conversion chip is connected to the power isolation module, and the power supply end of the signal conversion chip is connected in series with the third capacitor and is grounded;

[0023] The address pin end, the ground end and the 2-channel analog end of the signal conversion chip are grounded;

[0024] The serial data terminal and the serial clock terminal of the signal conversion chip are connected to the digital communication isolation module;

[0025] The 3-channel analog end of the signal conversion chip is connected to the cathode of the third diode, the third diode is grounded, the anode of the fourth diode is connected to the cathode of the third diode, the fourth diode is grounded, the first end of the sixth resistor is connected to the anode of the fourth diode, the second end of the sixth resistor is grounded, the first end of the first resistor is connected to the first end of the sixth resistor, and the second end of the first resistor is connected to the second signal port of the charging pile.

[0026] In a preferred example, the present invention can be further configured as follows: the digital communication isolation module includes a digital communication isolation chip, a third resistor, a fourth resistor, a fifth resistor, a seventh resistor, a seventh capacitor and an eighth capacitor, wherein:

[0027] The first ground terminal and the second ground terminal of the digital communication isolation chip are both grounded;

[0028] The first power supply terminal and the second power supply terminal of the digital communication isolation chip are respectively connected to the power supply isolation module, the first end of the seventh capacitor is connected to the first power supply terminal of the digital communication isolation chip, the second end of the seventh capacitor is grounded, the first end of the eighth capacitor is connected to the second power supply terminal of the digital communication isolation chip, and the second end of the eighth capacitor is grounded.

[0029] The first input terminal and the second input terminal of the digital communication isolation signal are connected to the signal conversion chip, and the first output terminal and the second output terminal of the digital communication isolation signal are connected to the main control terminal;

[0030] One end of the third resistor is connected to the first output end of the digital communication isolation signal, and the other end of the third resistor is grounded; one end of the fourth resistor is connected to the second output end of the digital communication isolation signal, and the other end of the fourth resistor is grounded.

[0031] In a preferred example, the present invention can be further configured as follows: the signal conditioning module further includes a second resistor, a sixth resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a seventeenth resistor, a nineteenth resistor, a seventh diode, a ninth diode, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a first operational amplifier, a second operational amplifier and a third operational amplifier, wherein:

[0032] The positive input electrode of the first operational amplifier is connected to one end of the tenth resistor, the other end of the tenth resistor receives the second control guidance signal, one end of the tenth capacitor is connected to the positive input electrode of the first operational amplifier, the other end of the tenth capacitor is grounded, the negative input electrode of the first operational amplifier is connected to the output end of the first operational amplifier, and the power supply end of the first operational amplifier is connected to the power isolation module;

[0033] One end of the ninth resistor is connected to the cathode of the seventh diode, the anode of the seventh diode is connected to the output of the first operational amplifier, and the other end of the ninth resistor is connected to the anode of the input of the second operational amplifier;

[0034] One end of the eighth resistor and one end of the ninth capacitor are connected to the positive input electrode of the second operational amplifier, and the other end of the eighth resistor and the other end of the ninth capacitor are grounded;

[0035] The negative input electrode of the second operational amplifier is connected to the output end of the second operational amplifier, the output end of the second operational amplifier is connected in series with the sixth resistor and the second resistor and is grounded, and the connection between the second resistor and the sixth resistor outputs the positive voltage signal to the voltage conditioning module;

[0036] The first end of the fifteenth resistor is connected to the anode of the ninth diode, the cathode of the ninth diode is connected to the output end of the first operational amplifier, and the second end of the fifteenth resistor is connected to the input cathode of the third operational amplifier via the fourteenth resistor;

[0037] One end of the seventeenth resistor and one end of the eleventh capacitor are connected to the second end of the fifteenth resistor, and the other end of the seventeenth resistor and the other end of the eleventh capacitor are grounded;

[0038] One end of the twelfth resistor is connected to the positive input of the third operational amplifier, the other end of the twelfth resistor is connected to the output of the third operational amplifier, the positive input of the third operational amplifier is grounded via the nineteenth resistor, the output of the third operational amplifier is connected in series with the thirteenth resistor and the eleventh resistor to ground, and the connection between the thirteenth resistor and the eleventh resistor outputs the negative voltage signal to the voltage conditioning module.

[0039] In a preferred example, the present invention can be further configured as follows: the relay control module further includes a first transistor, an eighth diode, a sixteenth resistor, an eighteenth resistor, a first inductor, a relay and a twenty-second resistor, wherein:

[0040] The first control end of the relay is connected to the power isolation module and the cathode of the eighth diode respectively, the second control end of the relay is connected to the collector of the first transistor and the anode of the eighth diode respectively, the emitter of the first transistor is grounded, the base of the first transistor is connected in series with the eighteenth resistor to ground, and the base of the first transistor is connected to the main control end via the sixteenth resistor;

[0041] The first working end of the relay is connected to the second working end of the relay via the first inductor, the first working end of the relay is connected to the second working end of the relay via the twenty-second resistor, the second working end of the relay is connected to the first signal port of the charging pile, and the first working end of the relay is connected to the PWM isolation transmission module.

[0042] In a preferred example, the present invention can be further configured as follows: the PWM isolation transmission module further includes a second transistor, a twentieth resistor, a twenty-first resistor, a twelfth capacitor, a twenty-third resistor, a twenty-fourth resistor and a PWM control chip, wherein:

[0043] The collector of the second transistor is connected to the input end of the PWM control chip via the twenty-first resistor, the emitter of the second transistor is grounded, the base of the second transistor is connected to the main control end via the twenty-fourth resistor, the base of the second transistor is connected to the power isolation module via the twenty-third resistor, the voltage output end of the PWM control chip is connected to the relay control module via the twentieth resistor, the output power supply end and the ground end of the PWM control chip are connected via the twelfth capacitor, and the output power supply end and the ground end of the PWM control chip are connected to the power isolation module.

[0044] In a preferred example, the present invention can be further configured as follows: the circuit further includes a fourth operational amplifier, wherein:

[0045] In summary, the present invention includes at least one of the following beneficial technical effects:

[0046] Through the high-frequency filtering of the relay control module, the voltage amplitude matching of the PWM isolation transmission module, the separation of positive and negative voltage signals of the voltage conditioning module, the digital processing of the signal conversion module, the signal isolation of the digital communication isolation module and the independent power supply of the power isolation module, each module works together, and under the condition of analog isolation, the accuracy of the voltage of the collected control guide signal can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic diagram of a control guide signal generation and detection circuit for a multi-standard charging pile provided in an embodiment of the present application;

[0048] Figure 2 A schematic diagram of the structure of another control guidance signal generation and detection circuit of a multi-standard charging pile provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0050] The current charging standards for new energy vehicles are mainly concentrated in the national standard, European standard and American standard. The control and guidance principles of these three charging standards are the same. The charging pile sends a specified voltage or PWM through the control guide line. The main control end of the car checks the voltage or PWM, identifies the status, and feeds back the level voltage of the control guide line to the charging pile end. The charging pile detects the voltage fed back by the main control end of the car to control the charging timing.

[0051] Since the charging control guide line and the high-voltage output line are integrated into the gun line at the same time during charging, they are easily interfered by high-voltage coupling. At the same time, the common end of the control guide is PE (shell ground), which is easy to interfere with PE when the switch device is in action or high-power output. Therefore, it is necessary to isolate the power supply and signal.

[0052] See also Figure 1 , is a schematic diagram of the structure of a control guide signal generation and detection circuit for a multi-standard charging pile provided in an embodiment of the present application. The circuit includes a relay control module, a PWM isolation transmission module, a signal conditioning module, a signal conversion module, a digital communication isolation module and a power isolation module, wherein:

[0053] The relay control module is connected to the first signal port of the charging pile, and the relay control module is used to filter the high-frequency signal in the first control guide signal of the first signal port to obtain a second control guide signal;

[0054] The PWM isolation transmission module is connected to the main control end and the relay control module respectively. The PWM control module is used to convert the first PWM signal of the main control end into a second PWM signal with the same voltage amplitude as the second control pilot signal. The first PWM signal and the second PWM signal have the same frequency and duty cycle.

[0055] The voltage conditioning module is connected to the PWM transmission module, and the voltage conditioning module is used to separate the second control pilot signal into a positive pressure signal and a negative pressure signal according to the second PWM signal;

[0056] The signal conversion module is connected to the second signal port of the charging pile and the voltage conditioning module respectively. The signal conversion module is used to collect the connection guide signal of the second signal port, and the positive pressure signal and the negative pressure signal transmitted by the voltage conditioning module, and convert the positive pressure signal, the negative pressure signal and the connection guide signal into a first serial data signal and a first serial clock signal in the form of a digital signal;

[0057] The digital communication isolation module is connected to the main control end and the signal conversion module respectively. The digital communication isolation module is used to isolate the first serial data signal and the first serial clock signal, generate the second serial data signal and the second serial clock signal, and transmit the second serial data signal and the second serial clock signal to the main control end.

[0058] The power isolation module is respectively connected to the main control end, the PWM isolation transmission module, the signal conditioning module, the signal conversion module and the digital communication isolation module. The power isolation module is used to isolate and convert the power supply voltage of the main control end into the power supply voltage of the PWM isolation transmission module, the signal conditioning module, the signal conversion module and the digital communication isolation module.

[0059] The main function of the relay control module is to filter the high-frequency signal in the first control pilot signal of the first signal port to obtain the second control pilot signal. Because the high-frequency signal may interfere with the normal operation of the subsequent circuit, the stability and accuracy of the control signal can be ensured through filtering.

[0060] The PWM isolation and transmission module is connected to the main control end and the relay control module respectively. The task of the PWM isolation and transmission module is to convert the first PWM signal of the main control end into a second PWM signal with the same voltage amplitude as the second control pilot signal, while keeping the frequency and duty cycle of the first PWM signal and the second PWM signal consistent. This conversion process is completed by isolation transmission, ensuring the safe transmission of signals between different voltage domains and avoiding electrical interference.

[0061] The voltage conditioning module is connected to the PWM isolation and transmission module. The voltage conditioning module separates the second control pilot signal into a positive voltage signal and a negative voltage signal according to the second PWM signal. Through this separation, the required positive and negative voltage sources can be provided for subsequent signal processing, thereby realizing more complex signal conditioning and processing.

[0062] The signal conversion module is connected to the second signal port and the voltage conditioning module of the charging pile respectively. The function of the signal conversion module is to collect the connection guide signal of the second signal port, as well as the positive pressure signal and negative pressure signal transmitted by the voltage conditioning module, and convert these signals into the first serial data signal and the first serial clock signal in the form of digital signals. Because it converts analog signals into digital signals, it is convenient for subsequent digital processing and transmission.

[0063] The digital communication isolation module is connected to the main control end and the signal conversion module respectively. The digital communication isolation module is used to isolate the first serial data signal and the first serial clock signal, generate the second serial data signal and the second serial clock signal, and transmit these signals to the main control end. Through isolation processing, the influence of ground loop and electromagnetic interference on digital signals can be effectively prevented, and the reliability of data transmission can be ensured. The power isolation module is connected to the main control end, the PWM isolation transmission module, the signal conditioning module, the signal conversion module and the digital communication isolation module respectively. The function of the power isolation module is to isolate and convert the power supply voltage of the main control end into the power supply voltage of the PWM isolation transmission module, the signal conditioning module, the signal conversion module and the digital communication isolation module. This module ensures the power supply isolation between the functional modules and avoids power supply noise and interference.

[0064] See also Figure 2 , is a structural diagram of another control guidance signal generation and detection circuit of a multi-standard charging pile provided in an embodiment of the present application. It shows a specific circuit structure to explain the working principle of the present application in detail.

[0065] In an optional implementation, the voltage input terminal of the power isolation chip is connected to the power supply of the main control terminal, the ground terminal of the power isolation chip is grounded, and the zero output terminal of the power isolation chip is grounded;

[0066] One end of the first capacitor and the second capacitor are connected in parallel to the positive voltage output end of the power isolation chip, and the other ends of the first capacitor and the second capacitor are connected in parallel to the ground;

[0067] One end of the fourth capacitor and the fifth capacitor is connected in parallel to the negative voltage output end of the power isolation chip, and the other end of the fourth capacitor and the fifth capacitor is connected in parallel to the ground;

[0068] The positive voltage output terminal and the negative voltage output terminal of the power isolation chip are respectively connected to the positive voltage input terminal and the negative voltage input terminal of the power conversion chip, and the voltage output terminal of the power conversion chip is respectively connected to the PWM isolation transmission module, the signal conditioning module, the signal conversion module and the digital communication isolation module.

[0069] The voltage input terminal of the power isolation chip is connected to the power supply of the main control end to obtain the input voltage required by the system. The ground terminal of the power isolation chip is grounded to ensure the normal operation of the power isolation chip and provide a stable reference potential. The zero output terminal of the power isolation chip is also grounded to provide a stable zero potential reference.

[0070] In order to filter out power supply noise and provide stable power supply output, one end of the first capacitor and the second capacitor are connected in parallel to the positive voltage output end of the power isolation chip, and the other end is connected in parallel to the ground. Similarly, one end of the fourth capacitor and the fifth capacitor are connected in parallel to the negative voltage output end of the power isolation chip, and the other end is connected in parallel to the ground. The presence of these capacitors can effectively filter out power supply noise and ripples, ensuring smooth and stable power supply output.

[0071] The positive voltage output terminal and negative voltage output terminal of the power isolation chip are respectively connected to the positive voltage input terminal and negative voltage input terminal of the power conversion chip. The power conversion chip obtains positive and negative voltages from the power isolation chip through these connections, and further converts these voltages into the power supply voltages required by each functional module. The voltage output terminal of the power conversion chip is respectively connected to the PWM isolation transmission module, signal conditioning module, signal conversion module and digital communication isolation module to ensure that these modules obtain stable working voltages.

[0072] In an optional implementation, the signal conversion module includes a signal conversion chip, a first resistor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a third capacitor, and a sixth capacitor, wherein:

[0073] The 0-channel analog end of the signal conversion chip is connected to the cathode of the first diode, the anode of the first diode is grounded, the 0-channel analog end of the signal conversion chip is connected to the anode of the second diode, and the cathode of the second diode is connected to the power isolation module;

[0074] The analog end of channel 1 of the signal conversion chip is connected to the cathode of the fifth diode, the anode of the fifth diode is grounded, the analog end of channel 1 of the signal conversion chip is connected to the anode of the sixth diode, and the cathode of the sixth diode is connected to the power isolation module;

[0075] The 0-channel analog terminal and the 1-channel analog terminal of the signal conversion chip are connected to the voltage conditioning module;

[0076] The power supply end of the signal conversion chip is connected to the power isolation module, and the power supply end of the signal conversion chip is connected in series with the third capacitor and grounded;

[0077] The address pin end, ground end and 2-channel analog end of the signal conversion chip are grounded;

[0078] The serial data terminal and the serial clock terminal of the signal conversion chip are connected to the digital communication isolation module;

[0079] The 3-channel analog end of the signal conversion chip is connected to the cathode of the third diode, the third diode is grounded, the anode of the fourth diode is connected to the cathode of the third diode, the fourth diode is grounded, the first end of the sixth resistor is connected to the anode of the fourth diode, the second end of the sixth resistor is grounded, the first end of the first resistor is connected to the first end of the sixth resistor, and the second end of the first resistor is connected to the second signal port of the charging pile.

[0080] The signal conversion module includes a signal conversion chip, a first resistor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a third capacitor and a sixth capacitor. The 0-channel analog end of the signal conversion chip is connected to the cathode of the first diode, the anode of the first diode is grounded, and the 0-channel analog end is also connected to the anode of the second diode, and the cathode of the second diode is connected to the power isolation module. This design realizes signal protection and direction control through the unidirectional conductive characteristics of the diode, ensuring the accuracy of signal processing.

[0081] The analog end of channel 1 of the signal conversion chip is connected to the cathode of the fifth diode, the anode of the fifth diode is grounded, and the analog end of channel 1 is connected to the anode of the sixth diode, the cathode of the sixth diode is connected to the power isolation module. The configuration of these diodes also plays a role in protection and direction control to ensure that there is no interference during the signal conversion process.

[0082] The analog end of channel 0 and channel 1 of the signal conversion chip are also connected to the voltage conditioning module to obtain the conditioned signal for processing. The power supply end of the signal conversion chip is connected to the power isolation module to provide a stable working voltage, and is connected to the ground in series through a third capacitor to further filter out power supply noise and ensure the stable operation of the signal conversion chip.

[0083] The address pin, ground terminal and 2-channel analog terminal of the signal conversion chip are grounded to provide a stable potential reference to avoid the influence of floating voltage on signal conversion. The serial data terminal and serial clock terminal of the signal conversion chip are connected to the digital communication isolation module to ensure that the converted digital signal can be safely and reliably transmitted to the main control end.

[0084] In addition, the 3-channel analog end of the signal conversion chip is connected to the cathode of the third diode, the third diode is grounded, and the anode of the fourth diode is connected to the cathode of the third diode, and the fourth diode is grounded. The first end of the sixth resistor is connected to the anode of the fourth diode, and the second end is grounded, while the first end of the first resistor is connected to the first end of the sixth resistor, and the second end is connected to the second signal port of the charging pile. Through this configuration, the signal conversion module can effectively collect and process the signal of the second signal port of the charging pile, ensuring the accuracy and reliability of signal processing.

[0085] The digital communication isolation module includes a digital communication isolation chip, a third resistor, a fourth resistor, a fifth resistor, a seventh resistor, a seventh capacitor and an eighth capacitor, wherein:

[0086] The first ground terminal and the second ground terminal of the digital communication isolation chip are both grounded;

[0087] The first power supply end and the second power supply end of the digital communication isolation chip are respectively connected to the power supply isolation module, the first end of the seventh capacitor is connected to the first power supply end of the digital communication isolation chip, the second end of the seventh capacitor is grounded, the first end of the eighth capacitor is connected to the second power supply end of the digital communication isolation chip, and the second end of the eighth capacitor is grounded.

[0088] The first input terminal and the second input terminal of the digital communication isolation signal are connected to the signal conversion chip, and the first output terminal and the second output terminal of the digital communication isolation signal are connected to the main control terminal;

[0089] One end of the third resistor is connected to the first output end of the digital communication isolation signal, and the other end of the third resistor is grounded; one end of the fourth resistor is connected to the second output end of the digital communication isolation signal, and the other end of the fourth resistor is grounded.

[0090] The digital communication isolation module includes a digital communication isolation chip, a third resistor, a fourth resistor, a fifth resistor, a seventh resistor, a seventh capacitor and an eighth capacitor. The first ground terminal and the second ground terminal of the digital communication isolation chip are both grounded to provide a stable reference potential to ensure the normal operation of the chip.

[0091] The first power supply terminal and the second power supply terminal of the digital communication isolation chip are respectively connected to the power isolation module to obtain a stable power supply. The first end of the seventh capacitor is connected to the first power supply terminal of the digital communication isolation chip, and the second end is grounded, and the power supply noise is filtered out to ensure the stability of the power supply. Similarly, the first end of the eighth capacitor is connected to the second power supply terminal of the digital communication isolation chip, and the second end is grounded, which further filters the power supply noise and improves the stability of the system.

[0092] The first input terminal and the second input terminal of the digital communication isolation chip are connected to the signal conversion chip to receive the digital signals from the signal conversion chip. These signals are isolated and processed by the digital communication isolation chip to ensure that the signal transmission process is not interfered. The first output terminal and the second output terminal of the digital communication isolation chip are connected to the main control terminal to transmit the processed digital signal to the main control terminal to achieve reliable data communication.

[0093] In order to further ensure the stability of the signal, one end of the third resistor is connected to the first output terminal of the digital communication isolation chip, and the other end is grounded, which plays a role in current limiting and protection. One end of the fourth resistor is connected to the second output terminal of the digital communication isolation chip, and the other end is grounded, which also plays a role in current limiting and protection. The configuration of these resistors can prevent excessive current from damaging the chip and circuit, while stabilizing the output signal.

[0094] Through such a design, the digital communication isolation module can effectively isolate and transmit digital signals, ensuring that the signals are free from electrical interference during transmission. In specific implementation, by selecting appropriate capacitor and resistor parameters, the digital communication isolation chip can be ensured to operate in a stable working state. The selection of capacitors should take into account their filtering capabilities to ensure the stability of the power supply; the selection of resistors should ensure that the current distribution is reasonable to avoid overload.

[0095] In an optional implementation, the signal conditioning module further includes a second resistor, a sixth resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a seventeenth resistor, a nineteenth resistor, a seventh diode, a ninth diode, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a first operational amplifier, a second operational amplifier, and a third operational amplifier, wherein:

[0096] The positive input electrode of the first operational amplifier is connected to one end of the tenth resistor, the other end of the tenth resistor receives the second control guidance signal, one end of the tenth capacitor is connected to the positive input electrode of the first operational amplifier, the other end of the tenth capacitor is grounded, the negative input electrode of the first operational amplifier is connected to the output end of the first operational amplifier, and the power supply end of the first operational amplifier is connected to the power isolation module;

[0097] One end of the ninth resistor is connected to the cathode of the seventh diode, the anode of the seventh diode is connected to the output of the first operational amplifier, and the other end of the ninth resistor is connected to the anode of the input of the second operational amplifier;

[0098] One end of the eighth resistor and one end of the ninth capacitor are connected to the positive input electrode of the second operational amplifier, and the other end of the eighth resistor and the other end of the ninth capacitor are grounded;

[0099] The negative input electrode of the second operational amplifier is connected to the output end of the second operational amplifier, the output end of the second operational amplifier is connected in series with the sixth resistor and the second resistor and is grounded, and the connection between the second resistor and the sixth resistor outputs a positive voltage signal to the voltage conditioning module;

[0100] A first end of the fifteenth resistor is connected to the anode of the ninth diode, a cathode of the ninth diode is connected to the output end of the first operational amplifier, and a second end of the fifteenth resistor is connected to the input cathode of the third operational amplifier via the fourteenth resistor;

[0101] One end of the seventeenth resistor and one end of the eleventh capacitor are connected to the second end of the fifteenth resistor, and the other end of the seventeenth resistor and the other end of the eleventh capacitor are grounded;

[0102] One end of the twelfth resistor is connected to the positive input of the third operational amplifier, the other end of the twelfth resistor is connected to the output of the third operational amplifier, the positive input of the third operational amplifier is grounded via the nineteenth resistor, the output of the third operational amplifier is connected in series with the thirteenth resistor and the eleventh resistor to ground, and the connection between the thirteenth resistor and the eleventh resistor outputs a negative voltage signal to the voltage conditioning module.

[0103] The signal conditioning module includes a second resistor, a sixth resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a seventeenth resistor, a nineteenth resistor, a seventh diode, a ninth diode, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a first operational amplifier, a second operational amplifier, and a third operational amplifier. Through the reasonable configuration of these components, the signal conditioning module can filter, amplify and condition the input signal.

[0104] Specifically, the positive input electrode of the first operational amplifier is connected to one end of the tenth resistor, and the other end of the tenth resistor receives the second control guidance signal. One end of the tenth capacitor is connected to the positive input electrode of the first operational amplifier, and the other end is grounded, which plays a filtering role and eliminates high-frequency noise. The negative input electrode of the first operational amplifier is connected to its output end to form negative feedback, thereby improving the linearity and stability of the signal. The power supply end of the first operational amplifier is connected to the power isolation module to provide a stable power supply.

[0105] One end of the ninth resistor is connected to the cathode of the seventh diode, and the anode of the seventh diode is connected to the output of the first operational amplifier. The other end of the ninth resistor is connected to the input anode of the second operational amplifier to ensure the correct transmission and amplification of the signal. One end of the eighth resistor is connected to one end of the ninth capacitor, and the other end is grounded to further smooth the input signal through filtering.

[0106] The negative input terminal and the output terminal of the second operational amplifier are connected to form negative feedback to improve the stability and accuracy of the amplifier. The output terminal of the second operational amplifier is connected to the sixth resistor and the second resistor in series with each other and grounded. Through the configuration of these resistors, the voltage of the signal is adjusted to the required positive voltage level and output to the voltage conditioning module.

[0107] In order to generate a negative voltage signal, the signal conditioning module uses a third operational amplifier. The first end of the fifteenth resistor is connected to the anode of the ninth diode, and the cathode of the ninth diode is connected to the output end of the first operational amplifier. The second end of the fifteenth resistor is connected to the input cathode of the third operational amplifier through the fourteenth resistor, and the seventeenth resistor and the eleventh capacitor are connected in series between the second end of the fifteenth resistor and the ground to further stabilize and filter the signal.

[0108] One end of the twelfth resistor is connected to the positive input electrode of the third operational amplifier, and the other end is connected to the output end thereof to form positive feedback. The positive input electrode of the third operational amplifier is grounded through the nineteenth resistor to provide a reference potential. The output end of the third operational amplifier is connected to the ground in series through the thirteenth resistor and the eleventh resistor to generate a stable negative voltage signal, which is output to the voltage conditioning module.

[0109] The purpose of this design is to achieve amplification, filtering and voltage regulation of the input signal through the combination of operational amplifiers and passive components, ensuring the accuracy and integrity of the signal during transmission and processing. In specific implementation, by selecting appropriate resistance and capacitance parameters, the operational amplifier is ensured to operate in the best working state, the capacitor is used for filtering, and the resistor is used for current limiting and signal conditioning.

[0110] In an optional implementation, the relay control module further includes a first transistor, an eighth diode, a sixteenth resistor, an eighteenth resistor, a first inductor, a relay and a twenty-second resistor, wherein:

[0111] The first control end of the relay is connected to the power isolation module and the cathode of the eighth diode respectively, the second control end of the relay is connected to the collector of the first transistor and the anode of the eighth diode respectively, the emitter of the first transistor is grounded, the base of the first transistor is connected in series with the eighteenth resistor and is grounded, and the base of the first transistor is connected to the main control end via the sixteenth resistor;

[0112] The first working end of the relay is connected to the second working end of the relay via the first inductor, the first working end of the relay is connected to the second working end of the relay via the twenty-second resistor, the second working end of the relay is connected to the first signal port of the charging pile, and the first working end of the relay is connected to the PWM isolation transmission module.

[0113] The relay control module includes a first transistor, an eighth diode, a sixteenth resistor, an eighteenth resistor, a first inductor, a relay and a twenty-second resistor. The first control end of the relay is connected to the power isolation module and the cathode of the eighth diode respectively, and the second control end of the relay is connected to the collector of the first transistor and the anode of the eighth diode respectively. The emitter of the first transistor is grounded, the base is connected to the ground in series through the eighteenth resistor, and the base is also connected to the main control end through the sixteenth resistor.

[0114] The purpose of this design is to use the switching characteristics of the first transistor to control the on and off of the relay. When the main control terminal outputs a control signal, the signal reaches the base of the first transistor through the sixteenth resistor, turning on the transistor, forming a path between the collector and the emitter, and the relay is powered on. At the same time, the eighth diode plays a protective role to prevent the reverse voltage from damaging the transistor.

[0115] The first working end of the relay is connected to the second working end of the relay through the first inductor and the twenty-second resistor respectively. The first inductor plays a filtering role, eliminating high-frequency interference of the current and ensuring the stability of the current when the relay is working. The twenty-second resistor is used to limit the current to prevent excessive current from damaging the relay and the circuit. The second working end of the relay is connected to the first signal port of the charging pile, and the first working end is connected to the PWM isolation and transmission module to achieve signal isolation and conversion.

[0116] The main purpose of this design is to achieve effective management and regulation of charging pile signals through the switch control of the relay. In specific implementation, by selecting appropriate resistance, inductance and diode parameters, the stability of the circuit under different working conditions is ensured. The selection of inductance should take into account its filtering capability, the selection of resistance should ensure reasonable current distribution, and the selection of diode should ensure its withstand voltage and protection capabilities.

[0117] In an optional implementation, the PWM isolation transmission module further includes a second transistor, a twentieth resistor, a twenty-first resistor, a twelfth capacitor, a twenty-third resistor, a twenty-fourth resistor and a PWM control chip, wherein:

[0118] The collector of the second transistor is connected to the input end of the PWM control chip via the twenty-first resistor, the emitter of the second transistor is grounded, the base of the second transistor is connected to the main control end via the twenty-fourth resistor, the base of the second transistor is connected to the power isolation module via the twenty-third resistor, the voltage output end of the PWM control chip is connected to the relay control module via the twentieth resistor, the output power supply end of the PWM control chip is connected to the ground end via the twelfth capacitor, and the output power supply end of the PWM control chip and the ground end are connected to the power isolation module.

[0119] The PWM isolation transmission module includes a second transistor, a twentieth resistor, a twenty-first resistor, a twelfth capacitor, a twenty-third resistor, a twenty-fourth resistor and a PWM control chip. The collector of the second transistor is connected to the input end of the PWM control chip through the twenty-first resistor, and the emitter of the second transistor is grounded. The base of the second transistor is connected to the main control end through the twenty-fourth resistor, and is connected to the power isolation module through the twenty-third resistor.

[0120] The purpose of this design is to use the switching characteristics of the second transistor to control the transmission of the PWM signal. When the main control terminal outputs a control signal, the signal reaches the base of the second transistor through the twenty-fourth resistor, turning on the transistor, thereby transmitting the signal to the input terminal of the PWM control chip. The twenty-third resistor is used to stabilize the base current to ensure that the transistor works in a suitable state.

[0121] The output end of the PWM control chip is connected to the relay control module through the twentieth resistor to ensure that the PWM signal can effectively drive the relay. The output power supply end and the ground end of the PWM control chip are connected through the twelfth capacitor to play a filtering role, eliminate power supply noise, and ensure the stability of the output signal. The output power supply end and the ground end of the PWM control chip are also connected to the power isolation module to provide a stable power supply to ensure that the PWM control chip works safely between different potentials.

[0122] In specific implementation, the stability of the circuit under different working conditions is ensured by selecting appropriate resistance and capacitance parameters. The selection of resistance should ensure the reasonable distribution of base current and collector current, the selection of capacitance should ensure its filtering capability, and the selection of PWM control chip should meet the PWM signal processing requirements of the system.

[0123] The main purpose of this design is to achieve isolation and transmission of PWM signals through the PWM isolation and transmission module, ensuring the safe transmission of signals between different potentials. Through the control of the second transistor, the signal from the main control end can be effectively transmitted to the PWM control chip and further drive the relay control module. The filtering effect of the twelfth capacitor ensures the stability of the signal, and the power supply of the power isolation module ensures the safety of the system.

[0124] In an optional implementation, the circuit further includes a fourth operational amplifier, wherein the fourth operational amplifier is connected to the power isolation module and the signal conditioning module.

[0125] The positive input terminal of the fourth operational amplifier is connected to the output terminal of the signal conditioning module to receive the signal that has been preliminarily conditioned. The negative input terminal of the fourth operational amplifier is connected to the output terminal through a feedback resistor to form a negative feedback loop to improve the linearity and stability of the operational amplifier. The power supply terminal of the fourth operational amplifier is connected to the power isolation module to provide a stable power supply to ensure that the operational amplifier operates in the best working state.

[0126] The purpose of this design is to utilize the high input impedance and high gain characteristics of the fourth operational amplifier to further amplify and optimize the signal from the signal conditioning module. Through the negative feedback loop, signal distortion and noise can be effectively reduced to ensure signal accuracy.

[0127] In specific implementation, a suitable feedback resistor value is selected to determine the gain of the amplifier so that it can meet the system's demand for signal amplification. The stable power supply provided by the power isolation module ensures that the fourth operational amplifier can operate stably under different working environments.

[0128] The output end of the fourth operational amplifier is connected to a subsequent signal processing module or control module to ensure that the amplified and optimized signal can be accurately transmitted and processed. Through this design, the output signal of the signal conditioning module is further amplified and optimized to better meet the system's requirements for signal quality.

[0129] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A control guidance signal generation and detection circuit for a multi-standard charging pile, characterized in that: The circuit includes a relay control module, a PWM isolation transmission module, a signal conditioning module, a signal conversion module, a digital communication isolation module and a power isolation module, wherein: The relay control module is connected to the first signal port of the charging pile, and the relay control module is used to filter the high-frequency signal in the first control guide signal of the first signal port to obtain a second control guide signal; The PWM isolation and transmission module is connected to the main control end and the relay control module respectively, and the PWM isolation and transmission module is used to convert the first PWM signal of the main control end into a second PWM signal with the same voltage amplitude as the second control guide signal, and the frequency and duty cycle of the first PWM signal and the second PWM signal are the same; The signal conditioning module is connected to the PWM isolation and transmission module, and the signal conditioning module is used to separate the second control pilot signal into a positive pressure signal and a negative pressure signal according to the second PWM signal; The signal conversion module is connected to the second signal port of the charging pile and the signal conditioning module respectively, and the signal conversion module is used to collect the connection guide signal of the second signal port, and the positive pressure signal and the negative pressure signal transmitted by the signal conditioning module, and convert the positive pressure signal, the negative pressure signal and the connection guide signal into a first serial data signal and a first serial clock signal in the form of a digital signal; The digital communication isolation module is connected to the main control end and the signal conversion module respectively, and is used to isolate the first serial data signal and the first serial clock signal, generate a second serial data signal and a second serial clock signal, and transmit the second serial data signal and the second serial clock signal to the main control end.

2. The control guidance signal generation and detection circuit of the multi-standard charging pile according to claim 1, characterized in that: The power isolation module is respectively connected to the main control end, the PWM isolation and transmission module, the signal conditioning module, the signal conversion module and the digital communication isolation module, and the power isolation module is used to isolate and convert the power supply voltage of the main control end into the power supply voltage of the PWM isolation and transmission module, the signal conditioning module, the signal conversion module and the digital communication isolation module.

3. The control guidance signal generation and detection circuit of the multi-standard charging pile according to claim 1, characterized in that: The power isolation module includes a power isolation chip, a power conversion chip, a first capacitor, a second capacitor, a fourth capacitor and a fifth capacitor, wherein: The voltage input terminal of the power isolation chip is connected to the power supply of the main control terminal, the ground terminal of the power isolation chip is grounded, and the zero output terminal of the power isolation chip is grounded; One end of the first capacitor and the second capacitor are connected in parallel to the positive voltage output end of the power isolation chip, and the other end of the first capacitor and the second capacitor are connected in parallel to the ground; One end of the fourth capacitor and the fifth capacitor is connected in parallel to the negative voltage output end of the power isolation chip, and the other end of the fourth capacitor and the fifth capacitor is connected in parallel to the ground; The positive voltage output terminal and the negative voltage output terminal of the power isolation chip are respectively connected to the positive voltage input terminal and the negative voltage input terminal of the power conversion chip, and the voltage output terminal of the power conversion chip is respectively connected to the PWM isolation transmission module, the signal conditioning module, the signal conversion module and the digital communication isolation module.

4. The control guidance signal generation and detection circuit of the multi-standard charging pile according to claim 1, characterized in that: The signal conversion module includes a signal conversion chip, a first resistor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a third capacitor, and a sixth capacitor, wherein: The 0-channel analog end of the signal conversion chip is connected to the cathode of the first diode, the anode of the first diode is grounded, the 0-channel analog end of the signal conversion chip is connected to the anode of the second diode, and the cathode of the second diode is connected to the power isolation module; The 1-channel analog terminal of the signal conversion chip is connected to the cathode of the fifth diode, the anode of the fifth diode is grounded, the 1-channel analog terminal of the signal conversion chip is connected to the anode of the sixth diode, and the cathode of the sixth diode is connected to the power isolation module; The 0-channel analog terminal and the 1-channel analog terminal of the signal conversion chip are connected to the signal conditioning module; The power supply end of the signal conversion chip is connected to the power isolation module, and the power supply end of the signal conversion chip is connected in series with the third capacitor and is grounded; The address pin end, the ground end and the 2-channel analog end of the signal conversion chip are grounded; The serial data terminal and the serial clock terminal of the signal conversion chip are connected to the digital communication isolation module; The 3-channel analog end of the signal conversion chip is connected to the cathode of the third diode, the third diode is grounded, the anode of the fourth diode is connected to the cathode of the third diode, the cathode of the fourth diode is grounded, the first end of the sixth capacitor is connected to the anode of the fourth diode, the second end of the sixth capacitor is grounded, the first end of the first resistor is connected to the first end of the sixth capacitor, and the second end of the first resistor is connected to the second signal port of the charging pile.

5. The control guidance signal generation and detection circuit of the multi-standard charging pile according to claim 4, characterized in that: The digital communication isolation module includes a digital communication isolation chip, a third resistor, a fourth resistor, a fifth resistor, a seventh resistor, a seventh capacitor and an eighth capacitor, wherein: The first ground terminal and the second ground terminal of the digital communication isolation chip are both grounded; The first power supply terminal and the second power supply terminal of the digital communication isolation chip are respectively connected to the power isolation module, the first end of the seventh capacitor is connected to the first power supply terminal of the digital communication isolation chip, the second end of the seventh capacitor is grounded, the first end of the eighth capacitor is connected to the second power supply terminal of the digital communication isolation chip, and the second end of the eighth capacitor is grounded.

6. The control guidance signal generation and detection circuit of the multi-standard charging pile according to claim 5, characterized in that: The first input terminal and the second input terminal of the digital communication isolation chip are connected to the signal conversion chip, and the first output terminal and the second output terminal of the digital communication isolation chip are connected to the main control terminal; One end of the third resistor is connected to the first output end of the digital communication isolation chip, and the other end of the third resistor is grounded; one end of the fourth resistor is connected to the second output end of the digital communication isolation chip, and the other end of the fourth resistor is grounded.

7. The control guidance signal generation and detection circuit of the multi-standard charging pile according to claim 1, characterized in that: The signal conditioning module further includes a second resistor, a sixth resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a seventeenth resistor, a nineteenth resistor, a seventh diode, a ninth diode, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a first operational amplifier, a second operational amplifier and a third operational amplifier, wherein: The positive input electrode of the first operational amplifier is connected to one end of the tenth resistor, the other end of the tenth resistor receives the second control guidance signal, one end of the tenth capacitor is connected to the positive input electrode of the first operational amplifier, the other end of the tenth capacitor is grounded, the negative input electrode of the first operational amplifier is connected to the output end of the first operational amplifier, and the power supply end of the first operational amplifier is connected to the power isolation module; One end of the ninth resistor is connected to the cathode of the seventh diode, the anode of the seventh diode is connected to the output of the first operational amplifier, and the other end of the ninth resistor is connected to the anode of the input of the second operational amplifier; One end of the eighth resistor and one end of the ninth capacitor are connected to the positive input electrode of the second operational amplifier, and the other end of the eighth resistor and the other end of the ninth capacitor are grounded; The negative input electrode of the second operational amplifier is connected to the output end of the second operational amplifier, the output end of the second operational amplifier is connected to ground in series via the sixth resistor and the second resistor, and the connection between the second resistor and the sixth resistor outputs the positive voltage signal to the signal conditioning module; The first end of the fifteenth resistor is connected to the anode of the ninth diode, the cathode of the ninth diode is connected to the output end of the first operational amplifier, and the second end of the fifteenth resistor is connected to the input cathode of the third operational amplifier via the fourteenth resistor; One end of the seventeenth resistor and one end of the eleventh capacitor are connected to the second end of the fifteenth resistor, and the other end of the seventeenth resistor and the other end of the eleventh capacitor are grounded; One end of the twelfth resistor is connected to the positive input electrode of the third operational amplifier, the other end of the twelfth resistor is connected to the output end of the third operational amplifier, the positive input electrode of the third operational amplifier is grounded via the nineteenth resistor, the output end of the third operational amplifier is grounded in series via the thirteenth resistor and the eleventh resistor, and the connection between the thirteenth resistor and the eleventh resistor outputs the negative voltage signal to the signal conditioning module.

8. The control guidance signal generation and detection circuit of the multi-standard charging pile according to claim 1, characterized in that: The relay control module further includes a first transistor, an eighth diode, a sixteenth resistor, an eighteenth resistor, a first inductor, a relay and a twenty-second resistor, wherein: The first control end of the relay is connected to the power isolation module and the cathode of the eighth diode respectively, the second control end of the relay is connected to the collector of the first transistor and the anode of the eighth diode respectively, the emitter of the first transistor is grounded, the base of the first transistor is connected in series with the eighteenth resistor to ground, and the base of the first transistor is connected to the main control end via the sixteenth resistor; The first working end of the relay is connected to the second working end of the relay via the first inductor, the first working end of the relay is connected to the second working end of the relay via the twenty-second resistor, the second working end of the relay is connected to the first signal port of the charging pile, and the first working end of the relay is connected to the PWM isolation transmission module.

9. The control guidance signal generation and detection circuit of the multi-standard charging pile according to claim 1, characterized in that: The PWM isolation transmission module further includes a second transistor, a twentieth resistor, a twenty-first resistor, a twelfth capacitor, a twenty-third resistor, a twenty-fourth resistor and a PWM control chip, wherein: The collector of the second transistor is connected to the input end of the PWM control chip via the twenty-first resistor, the emitter of the second transistor is grounded, the base of the second transistor is connected to the main control end via the twenty-fourth resistor, the base of the second transistor is connected to the power isolation module via the twenty-third resistor, the voltage output end of the PWM control chip is connected to the relay control module via the twentieth resistor, the output power supply end and the ground end of the PWM control chip are connected via the twelfth capacitor, and the output power supply end and the ground end of the PWM control chip are connected to the power isolation module.

10. The control guidance signal generation and detection circuit of the multi-standard charging pile according to claim 1, characterized in that: The circuit further comprises a fourth operational amplifier, wherein: The fourth operational amplifier is connected to the power isolation module and the signal conditioning module.

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