AC charging pile control system

Abstract

The utility model discloses an alternating current charging pile control system. The problem that communication between an existing alternating current charging pile and a server is limited by mobile network signals and residual flow of a built-in internet of things card is solved. The charging pile comprises a controller, a wireless communication module which is in communication connection with the controller and is used for communication between the charging pile and a server, and an electric energy metering module which is in communication connection with the controller and is used for counting electrical information. The relay control module is used for isolating power input from charging pile output and correspondingly responding to a time length / electric quantity or self-use / sharing charging mode set by the controller, and the relay detection module is used for detecting faults of the relay control module. And the CP signal module is correspondingly and electrically connected between the controller and the CP port of the charging gun and is used for controlling the starting, stopping and power of the charging pile. The control system can reduce the limitation of environmental factors on the communication demand of the charging pile, enrich the working mode of the charging pile, and improve the reliability of the start-stop and power control of the charging pile.

Description

Technical Field

[0001] This application relates to the technical field of charging piles, and particularly to an AC charging pile control system. Background Art

[0002] The charging process of an electric vehicle requires converting the alternating current of an external power source into direct current stored in the internal battery. In an AC charging pile, this conversion process is achieved by an on-vehicle charger, which converts the external AC power into DC power for storage in the vehicle battery.

[0003] Compared with DC charging piles, although the charging speed of AC charging piles is relatively slow, they cause less damage to the battery. And because the converter of an AC charging pile is simple and the main power conversion is completed inside the on-vehicle charger, the cost of an AC charging pile is lower than that of a DC charging pile. In addition, an AC charging pile is smaller in size, flexible to install, and has relatively low requirements for ground bearing capacity, making it convenient to install and use in places such as personal residences and commercial buildings. Currently, almost all electric vehicles support AC charging, making AC charging piles more widely applicable.

[0004] To improve the utilization rate of charging piles, most communities install shared charging piles collectively. However, in the process of implementing the technical solutions in the embodiments of this application, the inventors of this application found that existing shared AC charging piles are generally installed in the underground garages of communities. Due to limited mobile network signals in the garage, it is easy to cause poor signal of the charging pile and inability to establish a communication connection with the server; moreover, the wireless communication of an AC charging pile is affected not only by the strength of the mobile network signal but also by the remaining traffic of its built-in IoT card. In the case of traffic arrears, it will also cause the AC charging pile to disconnect from the server and cannot be used normally.

[0005] The information disclosed in this background art section is only for deepening the understanding of the background art of this disclosure, and should not be regarded as an admission or any form of implication that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0006] In view of at least one of the above technical problems, this disclosure provides an AC charging pile control system, aiming to solve the problem that the communication between an existing AC charging pile and a server is restricted by the mobile network signal and remaining traffic of its built-in IoT card.

[0007] According to one aspect of the present disclosure, there is provided an AC charging pile control system, which includes a controller, a wireless communication module communicatively connected to the controller for the charging pile to communicate with a server, an electric energy metering module communicatively connected to the controller for counting electrical information, a relay control module for isolating the power input and the charging pile output and for correspondingly responding to the charging mode set by the controller by duration / electricity quantity or self-use / share, a relay detection module for detecting faults of the relay control module, and a CP signal module electrically connected between the controller and the CP port of the charging gun for controlling the start / stop and power of the charging pile; the wireless communication module includes a 4G / 5G communication unit and a Bluetooth communication unit.

[0008] In some embodiments of the present disclosure, the AC charging pile control system further includes a power supply module for electrically connecting to an external power supply to correspondingly provide the voltages required for the operation of each module of the system.

[0009] In some embodiments of the present disclosure, the AC charging pile control system further includes a clock module communicatively connected to the controller for providing real-time time data, and a voice module electrically connected to the controller correspondingly for responding to the corresponding voice commands of the controller.

[0010] In some embodiments of the present disclosure, the AC charging pile control system further includes an RS485 communication module communicatively connected to the controller for external devices.

[0011] In some embodiments of the present disclosure, the relay control module includes a live wire control unit and a neutral wire control unit respectively disposed between the input and output of the charging pile. The live wire control unit and the neutral wire control unit each include a relay and an anti-interference diode electrically connected to the control end of the relay.

[0012] In some embodiments of the present disclosure, the relay detection module includes relay detection units respectively disposed between the live wire input interface and the neutral wire output interface of the charging pile, and between the neutral wire input interface and the live wire output interface; the relay detection unit includes an isolation optocoupler whose control end is electrically connected to the input end of the relay detection unit and whose output end is electrically connected to the controller correspondingly.

[0013] In some embodiments of the present disclosure, the CP signal module includes a first operational amplifier, a second operational amplifier, and a third operational amplifier whose inverting inputs are respectively connected to a 12V power supply through corresponding voltage dividing circuits and whose non-inverting inputs are correspondingly electrically connected to the CP signal line, and a fourth operational amplifier whose inverting input is electrically connected to the CP signal line and whose non-inverting input is connected to the 12V power supply through a corresponding voltage dividing circuit; the output ends of the first operational amplifier and the second operational amplifier are correspondingly connected in series to control the conduction of a first optocoupler; the output ends of the third operational amplifier and the fourth operational amplifier are correspondingly connected in series to control the conduction of a second optocoupler; the output ends of the first optocoupler and the second optocoupler are correspondingly electrically connected to the controller.

[0014] In some embodiments of the present disclosure, the voltage dividing circuits corresponding to the first / second / third / fourth operational amplifiers respectively obtain voltage division voltages of 5.5V / 7V / 8.66V / 10V.

[0015] One or more technical solutions provided in the embodiments of the present application have at least any one of the following technical effects or advantages:

[0016] By establishing two communication methods, namely 4G communication network and Bluetooth communication, the limitation of environmental factors on the communication requirements of AC charging piles can be greatly reduced, and the communication reliability of AC charging piles is improved.

[0017] In addition, through the relay control module and the relay detection module, the failure rate of charging pile use can be reduced, and an alarm can be given in time when a fault occurs. Through the communication between the relay and the controller, different working modes of the AC charging pile can be realized, and the applicability of the charging pile is improved.

[0018] Furthermore, the CP signal module can complete effective communication between the AC charging pile and the vehicle, and accordingly adjust the working state of the charging pile in a timely manner, with a high-efficiency and reliable process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a partial principle block diagram of the AC charging pile control system in an embodiment of the present application.

[0020] Figure 2 It is a circuit schematic diagram of the relay control module in an embodiment of the present application.

[0021] Figure 3 It is a circuit schematic diagram of the relay detection module in an embodiment of the present application.

[0022] Figure 4 It is a circuit schematic diagram of the CP signal module in an embodiment of the present application.

[0023] Figure 5 It is a circuit schematic diagram of the RS485 communication module in an embodiment of the present application DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The "first", "second", etc. involved in this application are used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" involved in this application, unless otherwise specified, both include direct and indirect connection (coupling). The programs involved or relied on in the following embodiments are all conventional programs or simple programs in this technical field, and those skilled in the art can make conventional selections or adaptive adjustments according to specific application scenarios. The components, etc. involved in the following embodiments, unless otherwise specified, are all conventional commercially available products.

[0025] To better understand the technical solution of this application, the above technical solution will be described in detail below in conjunction with the specification drawings and specific implementation manners.

[0026] This example discloses an AC charging pile control system. Refer to Figure 1 , which includes a controller. In this embodiment, the controller uses a single-chip microcomputer as the control center of the AC charging pile. In this example, the AC charging pile control system further includes a clock module communicatively connected to the controller for providing accurate time information to the controller, so as to be used as the time control reference of the AC charging pile.

[0027] To realize the communication between the AC charging pile and the server, in this embodiment, the controller is communicatively connected with a wireless communication module. Considering that when the existing AC charging piles are used in signal-restricted environments such as basements, due to the low signal transmission and reception intensity of the communication module inside the AC charging pile or the communication module's traffic arrears, it may not be possible to establish effective communication with the server. Therefore, the wireless communication module includes a 4G / 5G communication unit and a Bluetooth communication unit. In this example, a 4G communication unit and a Bluetooth communication unit are specifically adopted. When the 4G signal strength of the 4G communication unit is weak and reliable communication with the server cannot be established or there are traffic arrears, the charging pile prompts the user to establish a connection between the operation terminal such as a mobile phone and the AC charging pile through Bluetooth, and uses the user's terminal device as a relay to utilize its strong signal transceiver ability to realize the communication between the AC charging pile and the server. Specifically, in this embodiment, the 4G communication unit includes an Air780E module, and the 4G communication unit communicates with the controller through a serial port and establishes a communication connection with the server through the TCP protocol to realize remote control and data acquisition of the AC charging pile; the Bluetooth communication unit uses an ESP32-S3 chip. In addition, in this example, after the Bluetooth communication unit establishes a Bluetooth communication connection with the user's mobile phone terminal, it receives the interaction data of the AC charging pile through the small program or application program of the mobile phone terminal, and transmits it to the server through the mobile network. After the server responds, the small program or application program receives the response data and then transmits it to the AC charging pile through Bluetooth, thereby achieving the purpose of communication.

[0028] The electric energy metering module is used to count the power supply and distribution information of AC charging piles, including electrical parameters such as electric quantity, current, voltage, and power, and can cooperate with peripheral sensors to achieve protection detection functions such as leakage, overvoltage, overcurrent, and high-temperature alarms. In this embodiment, a single-phase electric energy metering module with the model number BL0939 is used to detect data such as single-phase voltage, current, active power, electric quantity, leakage current, temperature, overvoltage, and overcurrent of the AC charging pile; and this module conducts data communication with the controller through the SPI method or the serial port method.

[0029] The relay control module is used to achieve separate control of the neutral line and the live line to ensure that the output end of the AC charging pile is de-energized when it is not working, thereby achieving isolation between the power input and the charging pile output, and improving the safety of the equipment. Specifically, refer to Figure 2 , in this embodiment, the relay control module includes a live line control unit and a neutral line control unit respectively connected between the input and output of the charging pile. Among them, the live line control unit includes a relay L. The action end of the relay L is connected between the live line input interface L_IN and the live line output interface L_OUT, and its control end is connected to the RELAY_L terminal of the controller through a triode Q1. Thus, after the controller outputs a connection instruction correspondingly, the triode Q1 conducts, the control end of the relay L is powered on, and the action end of the relay L is closed, and the live line is conducted; similarly, the neutral line control unit includes a relay N. The action end of the relay N is connected between the neutral line input interface N_IN and the neutral line output interface N_OUT, and its control end is connected to the RELAY_N terminal of the controller through a triode Q2. Thus, after the controller outputs a connection instruction correspondingly, the triode Q2 conducts, the control end of the relay N is powered on, and the action end of the relay N is closed, and the neutral line is conducted; in addition, refer to Figure 2 , anti-interference diodes D3 and D4 are respectively connected in parallel to the control ends of the two relays. The electromagnetic interference generated by the relay closing is absorbed through the anti-interference diodes to improve the action reliability of the relay.

[0030] In this embodiment, through the communication connection between the relay control module and the controller, the AC charging pile can implement different charging modes. In this embodiment, the charging modes of the AC charging pile can be divided into self-use charging mode, shared charging mode, charging-by-duration mode, and charging-by-electricity-quantity mode. Specifically, the AC charging pile establishes a communication connection with the server through the wireless communication module to obtain the permission setting information of the AC charging pile, so as to determine whether to enable the shared mode of scanning code charging for the AC charging pile. Otherwise, in the self-use mode, the controller does not respond to the scanning code charging instruction, and the relay control module does not conduct. In addition, through the clock module, the accurate measurement of the charging duration can be realized. After the set charging duration is reached, the controller controls the relay control module to disconnect and ends the charging to achieve charging by duration. Similarly, in the charging-by-electricity-quantity mode, through the electric energy metering module, the statistics of the power and voltage of the AC charging pile are realized, and the cumulative electric energy output during the working process of the AC charging pile is obtained. After the set electric quantity is reached, the controller controls the relay control module to disconnect.

[0031] In addition, in order to avoid faults caused by the adhesion of the relay, in this embodiment, the AC charging pile control system includes a relay detection module for detecting the faults of the relay control module. See Figure 3 , the relay detection module includes relay detection units respectively arranged between the live wire input interface L_IN and the neutral wire output interface N_OUT of the charging pile, and between the neutral wire input interface N_IN and the live wire output interface L_OUT, respectively realizing the fault detection of relay N and relay L. Electrical isolation is respectively carried out between the input and output of the relay detection unit by using isolation optocouplers U3 and U6. When the relay adheres, a loop will be formed between the outputs of L_IN and N_OUT. At this time, the isolation optocoupler conducts, and the RELAY_STICK_N terminal changes from high level to pulse level. Thus, the controller can determine whether the relay adheres by reading the signal of this pin.

[0032] The CP signal module is electrically connected between the controller and the CP port of the charging gun to control the start / stop of the charging pile and the charging power. See Figure 4, in this embodiment, the CP signal module includes a first operational amplifier U11A, a second operational amplifier U11B, a third operational amplifier U11C, and a fourth operational amplifier U11D. Among them, the inverting inputs of the first operational amplifier U11A, the second operational amplifier U11B, and the third operational amplifier U11C, and the non-inverting input of the fourth operational amplifier U11D are respectively connected to the 12V power supply through a voltage division circuit. Specifically, for the first operational amplifier U11A, a 5.5V inverting input voltage is obtained through the voltage division of resistor R24 and resistor R25; for the second operational amplifier U11B, a 7V inverting input voltage is obtained through the voltage division of resistor R29 and resistor R31; for the third operational amplifier U11C, an 8.66V inverting input voltage is obtained through the voltage division of resistor R35 and resistor R36; for the fourth operational amplifier U11D, a 10V non-inverting input voltage is obtained through the voltage division of resistor R44 and resistor R45. In addition, the non-inverting inputs of the first operational amplifier U11A, the second operational amplifier U11B, and the third operational amplifier U11C, and the inverting input of the fourth operational amplifier U11D are connected to the CP signal line. In this example, the outputs of the first operational amplifier U11A and the second operational amplifier U11B are connected to the bases of the series-connected transistors Q3 and Q4 to correspondingly control the on / off of the first optocoupler U10; the outputs of the third operational amplifier U11C and the fourth operational amplifier U11D are connected to the bases of the series-connected transistors Q5 and Q6 to correspondingly control the on / off of the second optocoupler U12.

[0033] Therefore, when the charging gun is not connected to the vehicle, the voltage of the CP signal line is 12V. At this time, the first operational amplifier U11A, the second operational amplifier U11B, the third operational amplifier U11C, and the fourth operational amplifier U11D are all in the off state, the triodes Q3, Q4, Q5, and Q6 are all cut off, the first optocoupler and the second optocoupler are off, and the CP_6V and CP_9V terminals output a high level. When the charging gun is connected to the vehicle, the internal circuit of the vehicle will cause the voltage of the CP signal line to drop from 12V to 9V. At this time, the first operational amplifier U11A and the second operational amplifier U11B are off, the third operational amplifier U11C and the fourth operational amplifier U11D output, the triodes Q5 and Q6 conduct, so that the second optocoupler U12 conducts, and the CP_9V terminal changes from a high level to a low level. When the AC charging pile controller detects the low-level signal of the CP_9V terminal, it starts to output a PWM signal to communicate with the vehicle. After the AC charging pile and the vehicle handshake successfully, the voltage of the CP signal line further drops from 9V to 6V. At this time, the first operational amplifier U11A, the second operational amplifier U11B, and the fourth operational amplifier U11D output, the third operational amplifier U11C is off, the triodes Q3 and Q4 conduct, and then the first optocoupler U10 conducts, and the CP_6V terminal changes from a high level to a pulsed level and remains in this state during the charging state. After the vehicle finishes charging, the level becomes 9V, and then the controller responds and controls the relay control module to turn off.

[0034] To meet the different voltage levels of each module of the AC charging pile control system and the power output requirements of the AC charging pile, in this embodiment, the AC charging pile control system includes a power supply module. The power supply module includes a full-bridge rectifier circuit, a filter circuit, a flyback power control chip, a transformer auxiliary winding power supply circuit, a primary peak current detection circuit, and a secondary power output circuit that are electrically connected in sequence. In addition, in order to realize the voltage stabilization of the power supply module, a voltage sampling feedback circuit is also provided in this example. It realizes feedback voltage stabilization by sampling and feeding back the output of the power supply module to the flyback power control chip for feedback control. In addition, in this embodiment, the regulated output voltage is further reduced to a 5V DC voltage by the voltage regulator chip TMI3252S, and the 5V voltage is further reduced to a 3.3V DC voltage by LD1117A.

[0035] The RS485 communication module is used to realize the function of the external auxiliary detection module, and it is communicatively connected to the controller. See Figure 5 , in this embodiment, the RS485 communication module uses an RS485 conversion chip of model CS48520S. The RX, TX, and RTS signal lines are isolated from the output end through the optocoupler U20 and the isolation chip CA-IS3722HS to prevent external 485 signals from interfering with the main control chip.

[0036] Although some preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the present application.

[0037] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of its inventive concept. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

1. An AC charging pile control system, characterized in that: It includes a controller, a wireless communication module connected to the controller for communication between the charging pile and the server, an energy metering module connected to the controller for statistical electrical information, a relay control module for isolating the power input and the charging pile output and for correspondingly responding to the charging mode set by the controller according to the duration / power or self-use / shared charging mode, a relay detection module for detecting faults of the relay control module, and a CP signal module electrically connected between the controller and the CP port of the charging gun for controlling the start and stop and power of the charging pile; the wireless communication module includes a 4G / 5G communication unit and a Bluetooth communication unit.

2. The AC charging pile control system according to claim 1, characterized in that: It also includes a power supply module for electrically connecting to an external power supply to provide the voltage required for each module of the system to work.

3. The AC charging pile control system according to claim 1, characterized in that: Also included is a clock module that is communicatively connected to the controller and is used to provide real-time time data.

4. The AC charging pile control system according to claim 1, characterized in that: It also includes an RS485 communication module that is connected to the controller for external devices.

5. The AC charging pile control system according to claim 1, characterized in that: The relay control module includes a live wire control unit and a neutral wire control unit respectively connected between the input and output of the charging pile, and the live wire control unit and the neutral wire control unit respectively include a relay and an anti-interference diode correspondingly electrically connected to the control end of the relay.

6. The AC charging pile control system according to claim 1, characterized in that: The relay detection module includes relay detection units respectively arranged between the live wire input interface and the neutral wire output interface of the charging pile, and between the neutral wire input interface and the live wire output interface; the relay detection unit includes an isolation optocoupler whose control end is electrically connected to the input end of the relay detection unit and whose output end is electrically connected to the controller.

7. The AC charging pile control system according to claim 1, characterized in that: The CP signal module includes a first operational amplifier, a second operational amplifier, and a third operational amplifier, whose inverting input ends are respectively connected to a 12V power supply through corresponding voltage divider circuits and whose non-phase input ends are electrically connected to the CP signal line, and a fourth operational amplifier, whose inverting input end is electrically connected to the CP signal line and whose non-phase input end is connected to the 12V power supply through a corresponding voltage divider circuit; the output ends of the first operational amplifier and the second operational amplifier correspond to serially control the conduction of the first optical coupler; the output ends of the third operational amplifier and the fourth operational amplifier correspond to serially control the conduction of the second optical coupler; and the output ends of the first optical coupler and the second optical coupler are electrically connected to the controller.

8. The AC charging pile control system according to claim 7, characterized in that: The voltage divider circuits corresponding to the first / second / third / fourth operational amplifiers obtain divided voltages of 5.5V / 7V / 8.66V / 10V respectively.

Images