Electric automobile charging system

Abstract

The utility model belongs to the technical field of charging piles, and aims to provide an electric automobile charging system. According to the technical scheme, the electric automobile charging system comprises a main control module, a charging gun position detection module, a charging gun lock module, a wireless communication module and a power module, the charging gun position detection module, the charging gun lock module and the wireless communication module are all electrically connected with the main control module, and the power module is electrically connected with the main control module. And the power supply module is used for providing power support for the main control module, the charging gun position detection module, the charging gun lock module and the wireless communication module. According to the utility model, automatic operation and maintenance management of the charging pile can be realized, a user can be effectively prevented from disorderly placing the charging gun, and unsafe accidents such as electric shock caused by disorderly inserting of the charging gun can be avoided.

Description

Technical Field

[0001] This utility model belongs to the field of charging pile technology, and specifically relates to an electric vehicle charging system. Background Technology

[0002] Electric vehicle charging stations are charging devices that provide electrical energy to electric vehicles, enabling them to store sufficient charge for operation. Charging methods are typically divided into DC fast charging and AC slow charging. Currently, AC charging stations generally rely on manual operation and maintenance. Some operators, in order to reduce labor costs, often use regular manual inspections for operation and maintenance. In using the existing technology, the inventors have discovered at least the following problems:

[0003] In unsupervised environments, users often leave charging guns lying around after charging their electric vehicles, such as scattering them on the ground, which can easily lead to accidents such as electric shock. Current technology often requires manual inspection to determine the location of the charging guns, which is not conducive to achieving automated operation and maintenance management of charging stations. Utility Model Content

[0004] In order to at least partially solve the above-mentioned technical problems, this utility model provides an electric vehicle charging system.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An electric vehicle charging system includes a main control module, a charging gun position detection module, a charging gun lock module, a wireless communication module, and a power supply module. The charging gun position detection module, the charging gun lock module, and the wireless communication module are all electrically connected to the main control module. The power supply module provides power support to the main control module, the charging gun position detection module, the charging gun lock module, and the wireless communication module.

[0007] In one possible design, the charging gun lock module includes a relay RLY, a relay RLY drive module, and an electromagnetic lock. One end of the coil of the relay RLY is electrically connected to the main control module through the relay RLY drive module, and the other end of the coil of the relay RLY is electrically connected to the power supply module. The switch of the relay RLY is a single-pole double-throw switch. The common terminal of the switch of the relay RLY is electrically connected to the electromagnetic lock, the normally open terminal of the switch of the relay RLY is electrically connected to the power supply module, and the normally closed terminal of the switch of the relay RLY is grounded.

[0008] In one possible design, the wireless communication module includes a 4G communication module, a level conversion module, a LoRa communication module, and a Bluetooth communication module. The 4G communication module is electrically connected to the main control module through the level conversion module, and both the LoRa communication module and the Bluetooth communication module are electrically connected to the main control module.

[0009] In one possible design, the electric vehicle charging system further includes a CP control module and an operational amplifier. The CP control module is electrically connected to the main control module and is electrically connected to a designated charging gun through the operational amplifier.

[0010] In one possible design, the electric vehicle charging system further includes an energy metering module and an RS485 communication module, wherein the energy metering module is electrically connected to the main control module via the RS485 communication module.

[0011] In one possible design, the electric vehicle charging system further includes a voice prompt module electrically connected to the main control module; the voice prompt module includes a voice decoding module, a voice storage module, and a power amplifier module, both of which are electrically connected to the main control module, and the power amplifier module is electrically connected to the voice decoding module.

[0012] In one possible design, the electric vehicle charging system further includes a status indication module, which is electrically connected to the main control module.

[0013] In one possible design, the electric vehicle charging system further includes a temperature detection module, which is electrically connected to the main control module.

[0014] In one possible design, the electric vehicle charging system also includes an emergency button module, which is electrically connected to the main control module.

[0015] In one possible design, the main control module uses an STM32F103RCT6 microcontroller U2 and its peripheral circuits.

[0016] The beneficial effects of this utility model are mainly reflected in its ability to achieve automated operation and maintenance management of charging piles, thereby improving safety. Specifically, during implementation, when the main control module receives a charging command, it controls the charging gun lock module to unlock the designated charging gun, allowing the user to remove the charging gun and charge the electric vehicle. The charging gun position detection module detects the presence of the designated charging gun, obtains its status information, and sends this information to the main control module. When the charging gun status information indicates it is in place, the main control module controls the charging gun lock module to lock the designated charging gun and outputs charging completion information via the wireless communication module. Based on this utility model, automated operation and maintenance management of charging piles can be achieved, effectively preventing users from misplacing charging guns and avoiding accidents such as electric shock caused by improper placement. Attached Figure Description

[0017] Figure 1 This is a block diagram of the electric vehicle charging system in the embodiment;

[0018] Figure 2 This is the circuit schematic diagram of the main control module in the embodiment;

[0019] Figure 3 This is a circuit diagram of the charging gun position detection interface in the embodiment;

[0020] Figure 4 This is a circuit diagram of the charging gun lock module in the embodiment;

[0021] Figure 5 This is a circuit diagram of the 4G communication module and the level conversion module in the embodiment;

[0022] Figure 6 This is a circuit schematic diagram of the Lora communication module in the embodiment;

[0023] Figure 7 This is a circuit diagram of the Bluetooth module in the embodiment;

[0024] Figure 8 This is a circuit diagram of the CP control module in the embodiment;

[0025] Figure 9 This is a circuit schematic diagram of the operational amplifier and charging interface in the embodiment;

[0026] Figure 10 This is a circuit diagram of the RS485 communication module and the meter interface in the embodiment;

[0027] Figure 11 This is a circuit diagram of the voice decoding module in the embodiment;

[0028] Figure 12 This is a circuit diagram of the voice storage module in the embodiment;

[0029] Figure 13 This is the circuit schematic of the power amplifier module in the embodiment;

[0030] Figure 14 This is a circuit diagram of the emergency stop button switch in the embodiment;

[0031] Figure 15 This is a circuit diagram of the power module in the embodiment. Detailed Implementation

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.

[0033] Example 1:

[0034] like Figure 1 As shown, this embodiment provides an electric vehicle charging system, including a main control module, a charging gun position detection module, a charging gun lock module, a wireless communication module, and a power supply module. The charging gun position detection module, the charging gun lock module, and the wireless communication module are all electrically connected to the main control module. The power supply module provides power to the main control module, the charging gun position detection module, the charging gun lock module, and the wireless communication module. It should be understood that this embodiment is applied to electric vehicle charging piles, meaning that the main control module, the charging gun position detection module, the charging gun lock module, the wireless communication module, and the power supply module are all circuit modules within the electric vehicle charging pile.

[0035] In this embodiment, the main control module is used to control the charging gun lock module to unlock the designated charging gun upon receiving a charging command, so that the user can remove the charging gun and charge the electric vehicle. It should be understood that the designated charging gun is the charging gun configured to cooperate with the charging gun lock module. It should be noted that in this embodiment, the main control module is used to perform functions such as data collection, calculation, and control of other modules. During implementation, the main control module communicates with the cloud server through the wireless communication module to achieve information interaction with the cloud server. For example, it receives charging commands sent by the cloud server through the wireless communication module, and when the user has finished charging and inserted the designated charging gun, it sends charging completion information to the cloud server through the wireless communication module so that the cloud server can perform charging billing, etc.

[0036] The charging gun position detection module is used to detect the presence of the designated charging gun, obtain the charging gun status information, and send the charging gun status information to the main control module; wherein, the charging gun status information is either charging gun presence status information or charging gun absence status information, charging gun presence means that the designated charging gun is inserted back into the charging gun socket on the charging pile, and charging gun absence means that the designated charging gun is pulled out of the charging gun socket on the charging pile.

[0037] The main control module is also used to control the charging gun lock module to perform a locking action on the designated charging gun when the charging gun status information is charging gun in place, and to output charging end information through the wireless communication module.

[0038] This embodiment enables automated operation and maintenance management of charging piles, improving safety. Specifically, during implementation, the main control module, upon receiving a charging command, controls the charging gun lock module to unlock a designated charging gun, allowing the user to remove the charging gun and charge the electric vehicle. The charging gun position detection module detects the charging gun's presence, obtains its status information, and sends this information to the main control module. When the charging gun status information indicates it is present, the main control module controls the charging gun lock module to lock the designated charging gun and outputs charging completion information via the wireless communication module. Based on this embodiment, automated operation and maintenance management of charging piles can be achieved, effectively preventing users from misplacing charging guns and avoiding accidents such as electric shock caused by improper placement.

[0039] In this embodiment, as Figure 2As shown, the main control module uses the STM32F103RCT6 microcontroller U2 and its peripheral circuits. It should be noted that the STM32F103RCT6 microcontroller U2 is a 32-bit ARM Cortex-M3 microcontroller from STMicroelectronics, with an operating frequency of up to 72MHz. It has rich peripherals, including multiple general-purpose timers, a universal asynchronous serial interface, SPI, I2C, USART, etc. It is an embedded microcontroller integrated circuit with a 32-bit core specification, 256KB of FLASH program memory and 48KB of RAM, and has a wide range of applications.

[0040] In this embodiment, as Figure 3 As shown, the charging gun position detection module is electrically connected to the main control module through the charging gun position detection interface L_IN. It adopts a KW-11-3Z / KW12 type travel limit switch, which consists of a pressure plate and a micro switch. When the designated charging gun is in the designated slot of the charging pile, the switch is in the closed state, and otherwise it is in the open state. The main control module can confirm whether the designated charging gun is in position by detecting the pin voltage of the travel limit switch.

[0041] In this embodiment, as Figure 4 As shown, the charging gun lock module includes a relay RLY, a relay RLY drive module, and an electromagnetic lock. One end of the coil of the relay RLY is electrically connected to the main control module through the relay RLY drive module, and the other end of the coil of the relay RLY is electrically connected to the power supply module. The switch of the relay RLY is a single-pole double-throw switch. The common terminal of the relay RLY switch is electrically connected to the electromagnetic lock, the normally open terminal of the relay RLY switch is electrically connected to the power supply module, and the normally closed terminal of the relay RLY switch is grounded. Specifically, in this embodiment, the electromagnetic lock is electrically connected to the common terminal of the relay RLY switch through the lock interface L_CTL; the relay RLY is an SRD-05VDC-SL-C type single-channel single-level relay. Pin 5 of this relay is the common terminal of the relay RLY switch, pin 2 of this relay is the normally open terminal of the relay RLY switch, and pin 3 of this relay is the normally closed terminal of the relay RLY switch. In this embodiment, the electromagnetic lock is installed in the charging gun socket of the charging pile. The main control module can realize the switching on and off of the coil of the relay RLY through the relay RLY drive module, thereby realizing the switching on and off of the electromagnetic lock, and thus realizing the locking or unlocking of the charging gun.

[0042] In this embodiment, the wireless communication module includes a 4G communication module, a level conversion module, a LoRa communication module, and a Bluetooth communication module. The 4G communication module is electrically connected to the main control module through the level conversion module, and both the LoRa communication module and the Bluetooth communication module are electrically connected to the main control module. It should be noted that in this embodiment, the main control module can achieve remote wireless communication with the cloud server through the 4G communication module or the LoRa communication module, and can achieve short-distance wireless communication with user terminals such as mobile phones supporting the charging pile through the Bluetooth communication module. As Figure 5 shown, the 4G communication module uses an ML307R type 4G communication chip U19 and its peripheral circuit. The level conversion module is used for voltage conversion when the main control module communicates with the 4G communication module, such as converting 3.3V to 1.8V, or converting 1.8V to 3.3V; as Figure 6 shown, the LoRa communication module uses a WH-L101-L-C type LoRa chip U6, which is a low-frequency half-duplex LoRa module supporting the concentrator communication protocol (also supporting the point-to-point communication protocol, firmware needs to be replaced); as Figure 7 shown, the Bluetooth module uses an A75-C2G4A12S1a type Bluetooth chip U25, which has characteristics such as ultra-low power consumption, high performance, and suitability for various 140 to 1020 MHz wireless applications.

[0043] In this embodiment, the 4G communication module is suitable for parking and charging places with good communication signals such as on the ground, while the LoRa communication module is more suitable for underground or other parking and charging places with poor 4G communication signals. Thus, this embodiment can be applied to different charging places and is convenient for application in mobile charging scenarios. Among them, LoRa is a low-power local area network wireless standard developed by Semtech Corporation. Its name "LoRa" stands for Long Range Radio, and its biggest feature is that it can transmit farther than other wireless methods under the same power consumption conditions, achieving the unity of low power consumption and long distance. Under the same power consumption, the communication distance is 3-5 times longer than that of traditional radio frequency communication. When the main control module uses the LoRa communication method based on the LoRa communication module, the data of the charging pile and the parking space lock can be transmitted to the LoRa communication gateway through the LoRa module, and the LoRa communication gateway then transmits the collected data to the cloud server in the form of a wired network or a 4G network to achieve data transmission and interaction between the charging pile and the cloud.

[0044] It should be noted that the settings of the 4G communication module and the LoRa communication module can achieve data interaction with the cloud server, which is beneficial for charging operators to provide services such as unmanned operation.

[0045] In this embodiment, the electric vehicle charging system further includes a CP control module and an operational amplifier. The CP control module is electrically connected to the main control module, and the CP control module is electrically connected to the designated charging gun through the operational amplifier. It should be noted that in this embodiment, the CP control module is responsible for acquiring external voltage and using the PWM signal generated by the main control module to control the designated charging gun, thereby controlling the charging power. Specifically, as shown... Figure 8 As shown, the CP control module adopts the TPS5430DDAR type current PWM converter U8, which integrates low resistance, high-side N-channel MOSFET, can provide strict voltage regulation accuracy under transient conditions, and also has the characteristics of high-level active enable, overcurrent limiting, overvoltage protection and thermal shutdown.

[0046] In this embodiment, as Figure 9 As shown, the CP control module is connected to the OPA2197IDR operational amplifier U10. The designated charging gun is connected to the output of the operational amplifier through the charging gun interface L_CP. During implementation, the CP control module uses a resistor divider to reduce the maximum 12V sampling voltage to a maximum 3.3V sampling voltage, facilitating the main control module's use of the ADC for sampling. When the user inserts the designated charging gun into the car, the vehicle-side BMS (Battery Management System) will change the voltage sampled by the CP control module at various stages, allowing the main control module to determine different charging states based on the ADC sampling voltage. For example, a voltage change in the CP control module, such as a drop from 12V to 9V, indicates that the designated charging gun has successfully connected to the new energy vehicle. A drop from 9V to 6V indicates that the vehicle-side BMS is ready to charge, and a boost from 6V to 9V indicates that the electric vehicle's battery is fully charged. Another function of the CP control module is to adjust the charging power using the PWM signal issued by the main control module. For example, when there is a power shortage in the area, the charging power can be appropriately reduced to effectively alleviate the increase in the power load in the area.

[0047] In this embodiment, as Figure 10As shown, the electric vehicle charging system also includes an energy metering module and an RS485 communication module. The energy metering module is electrically connected to the main control module via the RS485 communication module. Specifically, in this embodiment, the energy metering module is used to collect information such as charging voltage, current, and frequency, and transmit it to the main control module via the RS485 module. In addition, the main control module can also be wired to external communication devices via the RS485 module. In this embodiment, the energy metering module uses a DDS4921 energy meter, which is electrically connected to the RS485 communication module via the meter interface RS485_0. It can realize active energy metering, requires no calibration for long-term operation, and utilizes large-scale integrated circuits, featuring excellent process technology and simple structure. Furthermore, it boasts high precision, long lifespan, and high reliability. The RS485 communication module uses the GM75176E high-speed RS485 communication interface chip U4, a half-duplex 10Mbps high-speed transceiver containing one driver and one receiver. It features ±15kV human body mode ESD protection and failure protection circuitry. When the receiver input is open-circuited or short-circuited, it ensures the receiver output logic is high and does not limit the slew rate, guaranteeing a communication rate of up to 10Mbps. It also has a built-in over-temperature protection circuit to ensure the chip is not damaged under high-temperature conditions.

[0048] Existing charging stations generally lack voice prompts and user interaction, resulting in a less than pleasant and user-friendly charging experience. Therefore, this embodiment further improves upon this by including a voice prompt module electrically connected to the main control module. This voice prompt module comprises a voice decoding module, a voice storage module, and a power amplifier module. Both the voice decoding module and the voice storage module are electrically connected to the main control module, and the power amplifier module is electrically connected to the voice decoding module. Specifically, in this embodiment, as shown... Figure 11 As shown, the voice decoding module uses the KT404C-16SS voice chip U3 and its peripheral circuitry. The KT404C-16SS voice chip U3 integrates MP3 and WAV hardware decoding, allowing for the playback of specified audio and other functions via simple serial port commands. This eliminates the need for complex low-level operations, making it convenient, stable, and reliable. Figure 12 As shown, the voice storage module uses a W25Q32JVSSIQ type storage chip U13 to store various types of voice information; such as Figure 13As shown, the power amplifier module includes a HAA2018A(B)-R type power amplifier U14 electrically connected to the voice decoding module and a speaker electrically connected to the power amplifier U14. The speaker is electrically connected to the power amplifier U14 through the power amplifier interface speaker, and is used to amplify the voice information output by the voice decoding module.

[0049] In this embodiment, the electric vehicle charging system further includes a status indicator module, which is electrically connected to the main control module. Specifically, in this embodiment, the status indicator module uses a WS2812B type RGB LED strip, with each LED containing a chip for control, which controls its on / off state by sending specific timing data. The main control module controls the color and brightness of the status indicator module, and different colors can indicate different charging stages. For example, a blue status indicator indicates that the system is in normal standby mode, a slow blue flash indicates that the charging gun has been unplugged, and a green status indicator indicates that the charging gun has been successfully connected to the vehicle, etc. No further limitations are specified here.

[0050] In this embodiment, the electric vehicle charging system further includes a temperature detection module, which is electrically connected to the main control module. Specifically, in this embodiment, the temperature detection module is used to detect the ambient temperature and send the temperature information to the main control module, so that the main control module can determine whether the temperature exceeds a threshold and can stop the charging activity when the temperature exceeds the threshold, thereby realizing overheat protection in this embodiment.

[0051] In this embodiment, the electric vehicle charging system further includes an emergency button module, which is electrically connected to the main control module. Specifically, in this embodiment, the emergency button module adopts the following... Figure 14 The emergency button switch L_STOP shown is electrically connected to the main control module. The emergency button module adopts the HBS1-AY-11TS / R type button switch. Operators and other users can manually press the button switch in case of charging or sending abnormalities. When the button is pressed, the two pins are connected. The main control module can detect whether the button is pressed by detecting the pin voltage, so as to take response actions such as stopping all charging activities.

[0052] In this embodiment, the power supply module provides 5V, 3.3V, 3.8V, and 12V voltage support for each module. The circuit diagram of the power supply module is shown below. Figure 15 As shown.

[0053] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An electric vehicle charging system, characterized in that: It includes a main control module, a charging gun position detection module, a charging gun lock module, a wireless communication module, and a power module. The charging gun position detection module, the charging gun lock module, and the wireless communication module are all electrically connected to the main control module. The power module is used to provide power support to the main control module, the charging gun position detection module, the charging gun lock module, and the wireless communication module. The main control module is used to control the charging gun lock module to perform an unlocking action on the designated charging gun when a charging command is received, so that the user can take out the charging gun and charge the electric vehicle. The charging gun position detection module is used to detect the presence of the designated charging gun, obtain the charging gun status information, and send the charging gun status information to the main control module; wherein, the charging gun status information is either charging gun presence status information or charging gun absence status information. The main control module is also used to control the charging gun lock module to perform a locking action on the designated charging gun when the charging gun status information is the charging gun in place status information, and to output charging end information through the wireless communication module. The main control module communicates with the cloud server through the wireless communication module to realize information interaction with the cloud server. The main control module receives the charging command sent by the cloud server through the wireless communication module. When the user finishes charging and inserts the designated charging gun into place, the main control module sends the charging end information to the cloud server through the wireless communication module so that the cloud server can perform charging billing. The main control module uses an STM32F103RCT6 microcontroller U2 and its peripheral circuits. The charging gun position detection module uses a KW-11-3Z / KW12 type travel limit switch, which consists of a pressure plate and a micro switch. When the designated charging gun is in the designated slot of the charging pile, the micro switch is in the closed state, and otherwise it is in the open state. The main control module confirms whether the designated charging gun is in place by detecting the pin voltage of the travel limit switch.

2. The electric vehicle charging system according to claim 1, characterized in that: The charging gun lock module includes a relay RLY, a relay RLY drive module, and an electromagnetic lock. One end of the coil of the relay RLY is electrically connected to the main control module through the relay RLY drive module, and the other end of the coil of the relay RLY is electrically connected to the power supply module. The switch of the relay RLY is a single-pole double-throw switch. The common terminal of the relay RLY switch is electrically connected to the electromagnetic lock, the normally open terminal of the relay RLY switch is electrically connected to the power supply module, and the normally closed terminal of the relay RLY switch is grounded.

3. The electric vehicle charging system according to claim 1, characterized in that: The wireless communication module includes a 4G communication module, a level conversion module, a LoRa communication module, and a Bluetooth communication module. The 4G communication module is electrically connected to the main control module through the level conversion module, and both the LoRa communication module and the Bluetooth communication module are electrically connected to the main control module.

4. The electric vehicle charging system according to claim 1, characterized in that: The electric vehicle charging system also includes a CP control module and an operational amplifier. The CP control module is electrically connected to the main control module and is electrically connected to the designated charging gun through the operational amplifier.

5. The electric vehicle charging system according to claim 1, characterized in that: The electric vehicle charging system also includes an energy metering module and an RS485 communication module, wherein the energy metering module is electrically connected to the main control module through the RS485 communication module.

6. The electric vehicle charging system according to claim 1, characterized in that: The electric vehicle charging system further includes a voice prompt module, which is electrically connected to the main control module. The voice prompt module includes a voice decoding module, a voice storage module, and a power amplifier module. The voice decoding module and the voice storage module are both electrically connected to the main control module, and the power amplifier module is electrically connected to the voice decoding module.

7. The electric vehicle charging system according to claim 1, characterized in that: The electric vehicle charging system also includes a status indication module, which is electrically connected to the main control module.

8. The electric vehicle charging system according to claim 1, characterized in that: The electric vehicle charging system also includes a temperature detection module, which is electrically connected to the main control module.

9. The electric vehicle charging system according to claim 1, characterized in that: The electric vehicle charging system also includes an emergency button module, which is electrically connected to the main control module.

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