Bluetooth alternating current charging pile
By using Bluetooth modules in charging piles to achieve communication with the server, the problems of high equipment costs and communication fees of existing charging piles are solved, and equipment costs and operation costs are reduced.
Patent Information
- Application Number
- CN202422033253.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-08-21
AI Technical Summary
The existing charging pile equipment is expensive and there is a problem of communication fees when using it.
Communication between the charging pile and the server is realized through the Bluetooth module, saving communication modules and corresponding fees, and reducing equipment costs and operating costs.
It has achieved the reduction of equipment costs and operating costs, avoided the cost and traffic costs of IoT cards, and improved the economic benefits of charging piles.
Smart Images
Figure CN222875800U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of charging piles, and in particular to a Bluetooth AC charging pile. Background Art
[0002] As the supporting infrastructure of electric vehicles, charging piles play a vital role and provide convenient charging services for electric vehicles. Charging piles can be divided into AC charging piles and DC charging piles according to different power supply methods. AC charging piles are generally suitable for small current charging, with small pile bodies and flexible installation; while DC charging piles are suitable for large current fast charging, with a larger charging capacity in a short period of time, but the pile bodies are larger and the occupied area is also increased accordingly. Among them, AC charging piles are favored for their economy, safety and convenience. The working principle of DC charging piles is relatively complicated, but the core lies in converting the AC power of the power grid into DC power to charge the battery of electric vehicles. The specific process includes: the three-phase power grid inputs AC power, which is converted into DC power by a bridge uncontrolled rectifier circuit, and then sent to a high-frequency DC-DC power converter after filtering by an LCR circuit, and finally outputs a DC voltage suitable for charging the battery of an electric vehicle.
[0003] AC charging piles are in great demand and in a wide range of scenarios. AC charging piles use QR code scanning to pay for charging and establish a connection with the server, which makes it necessary for the charging piles to have communication modules. However, the communication modules have certain costs and traffic fees, which will affect the equipment cost and economic benefits of the charging piles.
[0004] The information disclosed in this background technology section is only used to deepen the understanding of the background technology of the present disclosure, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art. Summary of the invention
[0005] In view of at least one of the above technical problems, the present disclosure provides a Bluetooth AC charging pile, aiming to solve the technical problems that the existing charging pile equipment has relatively high cost and communication charges when used.
[0006] According to one aspect of the present disclosure, a Bluetooth AC charging pile is provided, which includes a charging pile body and a charging gun electrically connected to the charging pile body through a charging harness; the charging pile body includes a switching power supply module and a control module for providing a DC power supply required for the operation of the charging pile, and the charging pile body also includes a Bluetooth module respectively connected to the control module for communication, a metering module for electric energy metering, a relay module for correspondingly isolating the charging gun voltage output and for responding to the corresponding working mode instructions of the control module, and a CP signal module for communicating with a charging vehicle.
[0007] In some embodiments of the present disclosure, the charging harness includes a live wire, a neutral wire, a ground wire, and a CP signal wire.
[0008] In some embodiments of the present disclosure, the Bluetooth AC charging pile also includes a clock module for providing real-time time data and an RS485 communication module for an external auxiliary detection module, which are respectively communicatively connected to the control module.
[0009] In some embodiments of the present disclosure, the Bluetooth AC charging pile further includes a display screen, a speaker, and an emergency stop switch which are arranged at the charging pile body and are respectively communicatively connected to the controller.
[0010] In some embodiments of the present disclosure, the relay module includes a relay action unit correspondingly connected to a power supply circuit of the charging gun, and a relay detection unit for detecting a working state of the relay action unit.
[0011] In some embodiments of the present disclosure, the relay action unit includes relays respectively connected to the live line and the neutral line of the power supply, and an anti-interference diode is connected in parallel to the relay control end.
[0012] In some embodiments of the present disclosure, the relay detection unit includes a first optocoupler connected between the live wire input port and the neutral wire output port of the relay, and a second optocoupler connected between the neutral wire input port and the live wire output port of the relay, and the first optocoupler and the second optocoupler are electrically connected to the control module accordingly.
[0013] In some embodiments of the present disclosure, the CP signal module includes a first op amp and a second op amp, whose inverting ends are electrically connected to a 12V power supply via a voltage divider circuit and whose non-inverting ends are connected to a CP signal, and a third op amp, and a fourth op amp, whose non-inverting ends are electrically connected to a 12V power supply via a voltage divider circuit and whose inverting ends are connected to a CP signal; the outputs of the first op amp and the second op amp are connected in series to control the conduction of a fourth optocoupler, and the outputs of the third op amp and the fourth op amp are connected in series to control the conduction of a fifth optocoupler; the output ends of the fourth optocoupler and the fifth optocoupler are correspondingly connected to the control module for communication.
[0014] One or more technical solutions provided in the embodiments of the present application have at least any of the following technical effects or advantages:
[0015] The Bluetooth module is used to realize Bluetooth communication with the user terminal, and then the connection between the charging pile and the server is established with the user terminal as the relay device, thereby eliminating the communication module and the corresponding charges, and reducing equipment costs and operating costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 1 is a circuit schematic diagram of a switching power supply module in an embodiment of the present application.
[0017] Figure 2 This is a circuit schematic diagram of a DC regulated power supply module in one embodiment of the present application.
[0018] Figure 3 This is a circuit schematic diagram of a Bluetooth module in one embodiment of the present application.
[0019] Figure 4 1 is a circuit diagram of a relay action unit in one embodiment of the present application.
[0020] Figure 5 1 is a circuit diagram of a relay detection unit in one embodiment of the present application.
[0021] Figure 6 2 is a circuit schematic diagram of a CP signal module in one embodiment of the present application. DETAILED DESCRIPTION
[0022] The terms "first", "second", etc. mentioned in this application are used to distinguish the objects described and do not have any order or technical meaning. The terms "connection" and "coupling" mentioned in this application include direct and indirect connections (couplings) unless otherwise specified. The programs involved or relied upon in the following embodiments are all conventional or simple programs in the field of this technology, and those skilled in the art can make conventional choices or adaptive adjustments based on specific application scenarios. The components and parts involved in the following embodiments are all conventional commercially available products unless otherwise specified.
[0023] In order to better understand the technical solution of the present application, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0024] This example discloses a Bluetooth AC charging pile, which includes a charging pile body, a charging gun electrically connected to the charging pile body through a charging harness, thereby establishing an electrical connection relationship with a car to be charged through the charging gun, and realizing charging start and stop and power control through the charging pile body. In this embodiment, the charging harness includes a live wire, a neutral wire, a ground wire and a CP signal line, wherein the CP signal line is used for communication between the charging pile body and the car, thereby correspondingly controlling the start and stop and output power of the charging pile body.
[0025] Specifically, in this embodiment, the charging pile body is used to realize charging and mode control, and it includes a switching power supply module, a control module, a Bluetooth module, a metering module, a relay module and a CP signal module.
[0026] The switching power supply module is used to provide the DC stable voltage required by the main body during charging. It specifically includes a full-bridge rectifier module, a filter module, a flyback power supply control chip, a transformer auxiliary winding power supply module, a primary peak current detection module and a secondary power output module connected in sequence. Figure 1The full-bridge rectifier module includes a full-bridge rectifier chip of model MB10F-GKA, which is used to convert AC power into DC power. The inductor and capacitor form a filter module to suppress noise in the circuit. The flyback power supply control chip outputs a corresponding PWM signal to adjust the output voltage of the transformer U5. Figure 1 In this example, the switching power supply module also includes a voltage sampling feedback module, which is used to divide the voltage output by the secondary of the transformer through a proportional adjustment circuit composed of resistors R15 and R12 and input it to the input end of the voltage regulator U7 as a voltage sampling signal. In this example, a voltage regulator of model TL431 is used; when the sampling voltage after voltage division is higher than the internal reference voltage of the voltage regulator U7 2.5V, the output current of the voltage regulator U7 increases, the light-emitting diode current inside the connected optocoupler U6 increases, and the current output by the optocoupler isolation also increases, and the feedback pin voltage fed back to the flyback power supply main control chip U1 becomes lower, the PWM duty cycle output by the flyback power supply main control chip U1 becomes smaller, and the voltage output by the transformer U5 becomes smaller, thereby realizing the sampling feedback voltage stabilization function.
[0027] In addition, in this embodiment, in order to obtain other voltage levels, see Figure 2 The charging pile body also includes a DC voltage-stabilized power supply module, which is used to further reduce the voltage output by the switching power supply module. In this embodiment, the 12V DC voltage output by the switching power supply module is reduced to 5V voltage by the voltage-stabilizing chip U4 of model TMI3252S, and its output voltage value is adjusted by resistors R12 and R18. The 5V voltage is then reduced to 3.3V DC voltage by the voltage-stabilizing chip U5 of model LD1117A. In this way, the different levels of voltage required for the normal operation of each module of the AC charging pile are met.
[0028] Considering that the existing AC charging piles need to establish a connection with the server when using them, such as scanning a code to charge, the charging pile needs to be equipped with an Internet of Things card. The Internet of Things card has a certain cost, which will increase the cost of the charging pile. At the same time, since the Internet of Things card will generate certain traffic fees when in use, the operating cost of the charging pile is increased. At the same time, when the Internet of Things card is in arrears, it will affect the normal use of the charging pile. To this end, in this embodiment, the communication between the AC charging pile and the server is realized through a Bluetooth module. In this embodiment, the Bluetooth module is communicatively connected to the control module. Among them, the control module includes a single-chip microcomputer, which is used as the control core of the AC charging pile to adjust the working mode and working status of the charging pile. See Figure 3In this example, the Bluetooth module includes a Bluetooth chip U14 of model ESP32-S3. Therefore, when the charging pile is in use, a connection between an operating terminal such as a mobile phone and the AC charging pile is established through Bluetooth, and the user's terminal device is used as a relay to utilize the signal receiving and sending capabilities of its terminal device to achieve communication between the AC charging pile and the server. As a result, the communication module of the charging pile is omitted, reducing the cost and use cost. In addition, in this example, after the Bluetooth communication unit establishes a Bluetooth communication connection with the user's mobile phone terminal, the interactive data of the AC charging pile is received through the small program or application of the mobile phone terminal, and transmitted to the server through the HTTP protocol via the mobile network. After the server responds, the small program or application receives the response data and transmits it to the AC charging pile through Bluetooth, thereby realizing data communication.
[0029] The metering module is used to count the power supply and distribution information of the AC charging pile, including power, current, voltage, power, etc., and can cooperate with peripheral sensors to realize protection detection functions such as leakage, overvoltage, overcurrent, and high temperature alarm. In this embodiment, a single-phase electric energy metering chip with model BL0939 is used to detect the single-phase voltage, current, active power, power, leakage current, temperature, overvoltage and overcurrent of the AC charging pile; and the chip communicates data with the control module through SPI or serial port.
[0030] The relay module is used to correspond to the voltage output of the isolated charging gun and to respond to the corresponding working mode instruction of the control module. Specifically, in this embodiment, the relay module includes a relay action unit and a relay detection unit.
[0031] The relay action unit is used to realize the separate control of the neutral line and the live line to ensure that the output end of the AC charging pile is not energized when it is not working, thereby realizing the isolation between the power input and the charging pile output, thereby improving the safety of the equipment. Figure 4 In this embodiment, the relay action unit includes a live wire control unit and a neutral wire control unit which are respectively connected between the input and output of the charging pile. The live wire control unit includes a relay L, the action end of the relay L is connected between the live wire input interface L_IN and the live wire output interface L_OUT, and its control end is connected to the RELAY_L terminal of the controller through a transistor Q1. Therefore, after the control module outputs a corresponding connection instruction, the transistor Q1 is turned on, and the control end of the relay L is powered on, so that the action end of the relay L is closed and the live wire is turned on; similarly, the neutral wire control unit includes a relay N, the action end of the relay N is connected between the neutral wire input interface N_IN and the neutral wire output interface N_OUT, and its control end is connected to the RELAY_N terminal of the controller through a transistor Q2. Therefore, after the control module outputs a corresponding connection instruction, the transistor Q2 is turned on, and the control end of the relay N is powered on, so that the action end of the relay N is closed and the neutral wire is turned on; in addition, see Figure 4The control ends of the two relays are respectively connected in parallel with anti-interference diodes D3 and D4. The anti-interference diodes absorb the electromagnetic interference generated by the relay closure, thereby improving the reliability of the relay operation.
[0032] In this embodiment, the AC charging pile can realize different charging modes through the communication connection between the relay action unit and the control module. In this embodiment, the charging mode of the AC charging pile can be divided into a self-use charging mode, a shared charging mode, a time-based charging mode, and an electricity-based charging mode. Specifically, the AC charging pile establishes a communication connection with the server through the Bluetooth module to obtain the AC charging pile authority setting information, thereby determining whether the AC charging pile turns on the shared mode of scanning code charging. Otherwise, in the self-use mode, the controller does not respond to the scanning code charging instruction, and the relay action unit does not conduct. In addition, after reaching the set charging time, the control module controls the relay action unit to disconnect, end charging, and realize time-based charging. Similarly, in the electricity-based charging mode, the power and voltage of the AC charging pile are counted through the metering module to obtain the accumulated electric energy output during the working process of the AC charging pile. After reaching the set electricity, the control module controls the relay action unit to disconnect.
[0033] In addition, in order to prevent the relay from sticking and causing failure, in this embodiment, the relay failure detection is implemented by a relay detection unit. Figure 5 The relay detection unit includes a first optical coupler U3 disposed between the live input interface L_IN and the neutral output interface N_OUT of the charging pile, and a second optical coupler U6 disposed between the neutral input interface N_IN and the live output interface L_OUT, which are respectively used to realize fault detection of relay N and relay L. When the relay is stuck, the outputs of L_IN and N_OUT will form a loop, the first optical coupler U3 is turned on, and the RELAY_STICK_N terminal changes from a high level to a pulse level, so that the control module can determine whether the relay is stuck by reading the pin signal.
[0034] The CP signal module is used to control the start and stop of the charging pile and the charging power. Figure 6In this embodiment, the CP signal module includes a first operational amplifier U11A, a second operational amplifier U11B and a third operational amplifier U11C, whose inverting terminals are electrically connected to a 12V power supply via a voltage divider circuit and whose non-inverting terminals are connected to a CP signal, and a fourth operational amplifier U11D, whose non-inverting terminals are electrically connected to a 12V power supply via a voltage divider circuit and whose inverting terminals are connected to a CP signal; specifically, the first operational amplifier U11A obtains a 5.5V inverting input voltage via a voltage divider between a resistor R24 and a resistor R25; the second operational amplifier U11B obtains a 7V inverting input voltage via a voltage divider between a resistor R29 and a resistor R31; the third operational amplifier U11C obtains an 8.66V inverting input voltage via a voltage divider between a resistor R35 and a resistor R36; and the fourth operational amplifier U11D obtains a 10V non-inverting input voltage via a voltage divider between a resistor R44 and a resistor R45. In addition, in this example, the outputs of the first operational amplifier U11A and the second operational amplifier U11B are connected to the bases of the transistors Q3 and Q4 arranged in series, corresponding to controlling the on and off of the fourth optical coupler U10; the outputs of the third operational amplifier U11C and the fourth operational amplifier U11D are connected to the bases of the transistors Q5 and Q6 arranged in series, corresponding to controlling the on and off of the fifth optical coupler U12. The output terminals CP_6V and CP_9V of the fourth optical coupler and the fifth optical coupler are respectively connected to the control module for communication.
[0035] Therefore, when the charging gun is not connected to the car, the CP signal line voltage is 12V. At this time, the first op amp U11A, the second op amp U11B, the third op amp U11C and the fourth op amp U11D are all in the off state, the transistors Q3, Q4, Q5, and Q6 are all cut off, the fourth and fifth optocouplers are turned off, and the CP_6V and CP_9V terminals output high levels. When the charging gun is connected to the car, the circuit inside the car will cause the CP signal line voltage to drop from 12V to 9V. At this time, the first op amp U11A and the second op amp U11B are turned off, the third op amp U11C and the fourth op amp U11D output, the transistors Q5 and Q6 are turned on, and the fifth optocoupler U12 is turned on, and the CP_9V terminal changes from a high level to a low level. When the AC charging pile control module detects a low-level signal at the CP_9V terminal, it starts to output a PWM signal to communicate with the car. After the AC charging pile and the car shake hands successfully, the CP signal line voltage is further reduced from 9V to 6V. At this time, the first op amp U11A, the second op amp U11B, and the fourth op amp U11D are outputting, the third op amp U11C is turned off, transistors Q3 and Q4 are turned on, and then the fourth optocoupler U10 is turned on, and the CP_6V terminal changes from a high level to a pulse level, and always maintains this state in the charging state. After the car is charged, the level becomes 9V, and then the control module responds and controls the relay action unit to close.
[0036] In addition, in this embodiment, the charging pile body also includes a clock module that is respectively connected to the control module. In this example, the clock module includes a clock chip of model SD8563, an external crystal oscillator, and a backup memory battery, which is used to provide real-time time data such as year, month, day, hour, minute, second, and week. In addition, in order to facilitate the connection of an external auxiliary detection module, an RS485 communication module is also provided in this example. The module includes an RS485 conversion chip of model CS48520S, and its RX, TX, and RTS signal lines are isolated from the output end through an optical coupler and an isolation chip to prevent external 485 signals from interfering with the main control chip.
[0037] In addition, in order to facilitate interaction with users, the charging pile body is also equipped with a display screen and a speaker that are respectively connected to the control module. In addition, the control module is also connected to an emergency stop switch, which can disconnect the power output and shut down the charging pile in an emergency.
[0038] Although some preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.
[0039] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the 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 equivalents, the present application is also intended to include these modifications and variations.
Claims
1. A Bluetooth AC charging station, characterized in that: It includes a charging pile body and a charging gun electrically connected to the charging pile body through a charging harness; the charging pile body includes a switching power supply module and a control module for providing the DC power required for the operation of the charging pile, and the charging pile body also includes a Bluetooth module respectively connected to the control module for communication, a metering module for electric energy metering, a relay module for corresponding isolated charging gun voltage output and for responding to the corresponding working mode instructions of the control module, and a CP signal module for communicating with the charging car.
2. The Bluetooth AC charging station according to claim 1, characterized in that: The charging harness includes a live wire, a neutral wire, a ground wire and a CP signal wire.
3. The Bluetooth AC charging station according to claim 1, characterized in that: It also includes a clock module for providing real-time time data and an RS485 communication module for an external auxiliary detection module, which are respectively connected to the control module for communication.
4. The Bluetooth AC charging station according to claim 1, characterized in that: It also includes a display screen, a speaker and an emergency stop switch which are arranged on the charging pile body and are respectively connected to the control module for communication.
5. The Bluetooth AC charging station according to claim 1, characterized in that: The relay module includes a relay action unit correspondingly connected to a power supply circuit of the charging gun and a relay detection unit for detecting a working state of the relay action unit.
6. The Bluetooth AC charging station according to claim 5, characterized in that: The relay action unit comprises relays respectively connected to the live line and the neutral line of the power supply, and an anti-interference diode is connected in parallel to the relay control end.
7. The Bluetooth AC charging station according to claim 5, characterized in that: The relay detection unit includes a first optocoupler connected between the relay live wire input port and the neutral wire output port, and a second optocoupler connected between the relay neutral wire input port and the live wire output port. The first optocoupler and the second optocoupler are electrically connected to the control module accordingly.
8. The Bluetooth AC charging station according to claim 1, characterized in that: The CP signal module includes a first operational amplifier and a second operational amplifier, and a third operational amplifier, whose inverting end is electrically connected to the 12V power supply via a voltage divider circuit and whose non-inverting end is connected to the CP signal, and a fourth operational amplifier, whose non-inverting end is electrically connected to the 12V power supply via a voltage divider circuit and whose inverting end is connected to the CP signal; the outputs of the first operational amplifier and the second operational amplifier are connected in series to control the conduction of the fourth optical coupler, and the outputs of the third operational amplifier and the fourth operational amplifier are connected in series to control the conduction of the fifth optical coupler; the output ends of the fourth optical coupler and the fifth optical coupler are correspondingly connected to the control module for communication.