Chaoji charging interface-based ac-dc composite charging method and system

Abstract

The application discloses a kind of AC-DC composite charging method and system based on ChaoJi charging interface.The method comprises the following steps: S1, obtain to be charged car, charging equipment, ChaoJi charging interface, the control guide circuit is equipped in the to be charged car, power supply loop, AC-DC detection circuit is arranged in the power supply loop, AC-DC switching circuit;S2, using ChaoJi charging interface is connected with to be charged car by charging equipment, if connection voltage is not in standard range, then stop operation;Otherwise, enter step S3;S3, if pulse signal is not detected within a certain time, then switch to the direct current guide circuit;Otherwise, switch to the alternating current guide circuit;S4, the to be charged car carries out charging preparation, and the charging equipment starts output charging voltage;S5, using the AC-DC detection circuit detects the charging voltage, and switches corresponding charging circuit, and starts charging.The application has the characteristics of simple structure and strong applicability.

Description

Technical Field

[0001] This invention relates to the field of charging technology, and specifically to an AC / DC hybrid charging method and system based on the ChaoJi charging interface. Background Technology

[0002] With the large-scale development of electric vehicles, charging technology is evolving towards diversification, large-scale production, and international standardization. Internationally, European and American charging systems have introduced AC / DC hybrid structures, with Tesla's NACS interface having a significant impact on international standards. AC / DC hybrid charging combines the functions of DC fast charging and AC slow charging interfaces into one. After incorporating an AC / DC hybrid charging system into the interface, vehicles requiring AC / DC charging only need one interface to achieve both AC charging and DC charging with existing mainstream interfaces. Meanwhile, the new generation ChaoJi charging interface system standard, led by China, has been released. ChaoJi incorporates the advantages of the four major international DC charging interface systems, improves upon the shortcomings of existing systems, adapts to high, medium, and low power charging, and meets the needs of home and various public charging scenarios. However, while ChaoJi charging technology is full of potential, it currently only supports DC charging and lacks a solution for AC / DC hybrid charging. This leads to several problems. Firstly, its complex structure, without the need for additional installation of existing mainstream AC charging interfaces, hinders component simplification and aesthetic design, and is also detrimental to saving space and costs. On the other hand, the lack of DC-DC hybrid charging functionality and inflexibility of the interface limit its applicability, hindering its adoption as a globally accepted charging interface standard. The ChaoJi charging control guidance circuit is similar in design to existing AC charging guidance circuits, laying the technical foundation for implementing AC / DC hybrid charging based on the ChaoJi interface. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to provide a versatile and simple AC / DC hybrid charging method and system based on the ChaoJi charging interface.

[0004] Technical solution: The AC / DC hybrid charging method based on the ChaoJi charging interface described in this invention includes the following steps:

[0005] S1. Obtain the vehicle to be charged, the charging equipment, and the ChaoJi charging interface. The vehicle to be charged is equipped with a control guidance circuit and a power supply circuit. An AC / DC detection circuit and an AC / DC switching circuit are set in the power supply circuit.

[0006] The charging device includes an AC charging device and / or a DC charging device; the control and guidance circuit includes a DC guidance circuit and an AC guidance circuit, and can freely switch between the DC guidance circuit and the AC guidance circuit; the AC / DC switching circuit includes a DC charging circuit and an AC charging circuit, and can freely switch between the DC charging circuit and the AC charging circuit.

[0007] S2. Connect the charging device to the vehicle to be charged using the ChaoJi charging interface. The control guidance circuit detects the connection voltage. If it is not within the standard range, an abnormality is detected and the operation is stopped; otherwise, proceed to step S3.

[0008] S3. The control and guidance circuit is used to detect pulse signals. If no pulse signal is detected within a certain period of time, the circuit switches to the DC guidance circuit; otherwise, the circuit switches to the AC guidance circuit.

[0009] S4. The vehicle to be charged prepares for charging, and the charging equipment starts to output charging voltage.

[0010] S5. The charging voltage is detected using the AC / DC detection circuit.

[0011] When the control and guidance circuit is a DC guidance circuit, if the charging voltage is within the AC charging voltage range, an abnormality is detected and the operation is stopped; otherwise, the circuit is switched to the DC charging circuit and charging begins.

[0012] When the control and guidance circuit is an AC guidance circuit, if the charging voltage is a DC charging voltage, an abnormality is detected and the operation is stopped; otherwise, the circuit is switched to the AC charging circuit and charging begins.

[0013] Furthermore, the vehicle to be charged also includes an on-board charger and a power battery.

[0014] Furthermore, in step S1, the AC / DC detection circuit and AC / DC switching circuit are connected in the vehicle to be charged in the following ways:

[0015] The power supply circuit is connected to the input terminal of the AC / DC detection circuit, and the input terminal of the AC / DC switching circuit is connected to the output terminal of the AC / DC detection circuit; the power supply circuit is connected to the input terminal of the AC / DC switching circuit, and the on-board charger and the power battery are connected to the output terminal of the AC / DC switching circuit.

[0016] Furthermore, when switching to the AC charging circuit, the AC / DC switching circuit outputs to the on-board charger; when switching to the DC charging circuit, the AC / DC switching circuit outputs to the power battery.

[0017] Furthermore, the pre-charging preparation includes changing the switch state to allow charging.

[0018] Furthermore, when the charging device is connected to the vehicle to be charged via a cable, the pre-charging preparation also includes detecting the cable capacity.

[0019] Furthermore, in step S3, if a pulse signal is detected within a certain time period, the following steps are also included:

[0020] The duty cycle of the pulse signal and the content of the communication message are detected. If the duty cycle is within the range of the digital communication standard and the message is identified as DC charging, then the circuit switches to the DC guidance circuit; otherwise, the circuit switches to the AC guidance circuit.

[0021] Furthermore, in step S2, the standard range is the specified normal charging connection voltage range; in step S3, the digital communication standard range is the specified range of normal duty cycles corresponding to the use of digital communication.

[0022] Furthermore, the vehicles to be charged include ChaoJi AC charging vehicles and ChaoJi AC / DC multiplexing vehicles.

[0023] Technical solution: The AC / DC hybrid charging system based on the ChaoJi charging interface of this invention includes:

[0024] A circuit connection module is used to acquire the vehicle to be charged, the charging equipment, and the ChaoJi charging interface. The vehicle to be charged is equipped with a control guidance circuit and a power supply circuit. The power supply circuit is equipped with an AC / DC detection circuit and an AC / DC switching circuit. The charging equipment includes an AC charging device and / or a DC charging device. The control guidance circuit includes a DC guidance circuit and an AC guidance circuit, and can freely switch between the DC guidance circuit and the AC guidance circuit. The AC / DC switching circuit includes a DC charging circuit and an AC charging circuit, and can freely switch between the DC charging circuit and the AC charging circuit.

[0025] The physical connection module is used to connect the charging device to the vehicle to be charged using the ChaoJi charging interface. The control guidance circuit detects the connection voltage. If it is not within the standard range, an abnormality is detected and the operation is stopped; otherwise, the process enters the guidance circuit selection module.

[0026] The guide circuit selection module is used to detect pulse signals using the control guide circuit. If no pulse signal is detected within a certain period of time, it switches to the DC guide circuit; otherwise, it switches to the AC guide circuit.

[0027] A charging preparation module is used to prepare the vehicle to be charged for charging, and the charging device starts to output charging voltage.

[0028] The charging circuit selection module is used to detect the charging voltage using the AC / DC detection circuit. When the control guidance circuit is a DC guidance circuit, if the charging voltage is within the AC charging voltage range, an abnormality is detected and operation is stopped; otherwise, the circuit switches to the DC charging circuit and charging begins. When the control guidance circuit is an AC guidance circuit, if the charging voltage is a DC charging voltage, an abnormality is detected and operation is stopped; otherwise, the circuit switches to the AC charging circuit and charging begins.

[0029] Beneficial Effects: This invention has the following significant effects: 1. Strong Applicability: This invention provides an AC / DC multiplexing charging solution for the new generation of ChaoJi DC charging, which is compatible with the existing ChaoJi DC charging solution while realizing AC charging. Based on the method of this invention, ChaoJi AC / DC multiplexing vehicles only need to install the ChaoJi interface to perform AC or DC charging, which is highly applicable; 2. Simple Structure: This invention connects one side of the ChaoJi interface to the charging equipment and the other side to the vehicle to be charged, which meets the existing AC charging control guidance circuit and timing, and realizes single-phase AC power supply. The structure is simple and does not require the additional installation of the current mainstream AC charging interface, which helps to simplify the design of the vehicle to be charged, has low upgrade costs, and is conducive to meeting personalized needs. Attached Figure Description

[0030] Figure 1 This is a timing diagram of the AC / DC composite charging method of the present invention;

[0031] Figure 2 A schematic diagram of AC charging for connecting AC charging equipment;

[0032] Figure 3 A schematic diagram of DC charging for connecting a DC charging device. Detailed Implementation

[0033] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0034] Please see Figure 1 As shown, this invention discloses an AC / DC hybrid charging method and system based on the ChaoJi charging interface.

[0035] The AC / DC hybrid charging method includes the following steps:

[0036] S1. Obtain the vehicle to be charged, the charging equipment, and the ChaoJi charging interface. The vehicle to be charged is equipped with a control guidance circuit and a power supply circuit. An AC / DC detection circuit and an AC / DC switching circuit are set in the power supply circuit.

[0037] The charging device includes an AC charging device and / or a DC charging device; the control and guidance circuit includes a DC guidance circuit and an AC guidance circuit, and can freely switch between the DC guidance circuit and the AC guidance circuit; the AC / DC switching circuit includes a DC charging circuit and an AC charging circuit, and can freely switch between the DC charging circuit and the AC charging circuit.

[0038] S2. Connect the charging device to the vehicle to be charged using the ChaoJi charging interface. The control guidance circuit detects the connection voltage. If it is not within the standard range, an abnormality is detected and the operation is stopped; otherwise, proceed to step S3.

[0039] S3. The control and guidance circuit is used to detect the pulse signal. If no pulse signal is detected within a certain period of time, the circuit is switched to the DC guidance circuit; otherwise, the circuit is switched to the AC guidance circuit.

[0040] S4. The vehicle to be charged prepares for charging, and the charging equipment starts to output charging voltage.

[0041] S5. The charging voltage is detected using the AC / DC detection circuit.

[0042] When the control and guidance circuit is a DC guidance circuit, if the charging voltage is within the AC charging voltage range, an abnormality is detected and the operation is stopped; otherwise, the circuit is switched to the DC charging circuit and charging begins.

[0043] When the control and guidance circuit is an AC guidance circuit, if the charging voltage is a DC charging voltage, an abnormality is detected and the operation is stopped; otherwise, the circuit is switched to the AC charging circuit and charging begins.

[0044] The AC / DC hybrid charging system includes:

[0045] The circuit connection module is used to acquire the vehicle to be charged, the charging equipment, and the ChaoJi charging interface. The vehicle to be charged is equipped with a control guidance circuit and a power supply circuit. The power supply circuit is equipped with an AC / DC detection circuit and an AC / DC switching circuit. The charging equipment includes an AC charging device and / or a DC charging device. The control guidance circuit includes a DC guidance circuit and an AC guidance circuit, and can freely switch between the DC guidance circuit and the AC guidance circuit. The AC / DC switching circuit includes a DC charging circuit and an AC charging circuit, and can freely switch between the DC charging circuit and the AC charging circuit.

[0046] The physical connection module is used to connect the charging device to the vehicle to be charged using the ChaoJi charging interface. The control guidance circuit detects the connection voltage. If it is not within the standard range, an abnormality is detected and the operation is stopped; otherwise, the system enters the guidance circuit selection module.

[0047] The guide circuit selection module is used to detect pulse signals using the control guide circuit. If no pulse signal is detected within a certain period of time, it switches to the DC guide circuit; otherwise, it switches to the AC guide circuit.

[0048] The charging preparation module is used to prepare the vehicle to be charged before charging, and the charging device starts to output charging voltage.

[0049] The charging circuit selection module is used to detect the charging voltage using the AC / DC detection circuit. When the control guidance circuit is a DC guidance circuit, if the charging voltage is within the AC charging voltage range, an abnormality is detected and operation is stopped; otherwise, the circuit switches to the DC charging circuit and charging begins. When the control guidance circuit is an AC guidance circuit, if the charging voltage is a DC charging voltage, an abnormality is detected and operation is stopped; otherwise, the circuit switches to the AC charging circuit and charging begins.

[0050] The method and system of the present invention will be further described below.

[0051] Please see Figures 2 to 3 The vehicle to be charged also includes an on-board charger and a power battery. The vehicle to be charged includes ChaoJi AC charging vehicles and ChaoJi AC / DC multiplexed vehicles; that is, both ChaoJi AC charging vehicles and ChaoJi AC / DC multiplexed vehicles can be configured with the AC / DC composite charging system of this invention and are applicable to the AC / DC composite charging method of this invention. In this embodiment, according to the requirements of "Electric Vehicle Conductive Charging System Part 1: General Requirements" (GB / T18487.1—2023), monitoring point 1 is set in the control guidance circuit of the charging equipment to output pulse signals or communication signals under specific conditions. Monitoring points 2 and 3, switch S2', switch Sv, and switch S2 are set on the control guidance circuit of the vehicle to be charged. The voltage at monitoring points 1, 2, and 3 may change due to factors such as resistance, power supply error, and line impedance in the control guidance circuit; therefore, it is necessary to set corresponding nominal values ​​for monitoring the voltage changes. The nominal values ​​are set independently according to the actual circuit conditions and can be endpoint values ​​or range values. In this embodiment, the nominal values ​​of DC guidance circuit monitoring point 1 on the charging equipment side are 2.91V and 5.97V, the nominal values ​​of AC guidance circuit monitoring point 1 are 9.0V and 6.0V, and the nominal value of control guidance circuit monitoring point 2 on the vehicle to be charged side is 8.22V.

[0052] Step S1, in the circuit connection module, the connection method of the AC / DC detection circuit and the AC / DC switching circuit in the vehicle to be charged includes: connecting the power supply circuit to the input terminal of the AC / DC detection circuit, and connecting the input terminal of the AC / DC switching circuit to the output terminal of the AC / DC detection circuit; connecting the power supply circuit to the input terminal of the AC / DC switching circuit, and connecting the on-board charger and the power battery to the output terminal of the AC / DC switching circuit. When the AC / DC switching circuit switches to the AC charging circuit, the AC / DC switching circuit outputs to the on-board charger. When the AC / DC switching circuit switches to the DC charging circuit, the AC / DC switching circuit outputs to the power battery.

[0053] In step S2, the physical connection module, the standard range is the specified normal charging connection voltage range. In this embodiment, switch S2' is set to the closed state, and the connection voltage at monitoring point 2 is used to determine whether it is within the normal connection voltage range, to ensure good contact between the ChaoJi interface, the charging device, and the vehicle to be charged.

[0054] When the charging device is an AC charging device, the AC charging device sends a pulse signal to the control guidance circuit, and the control guidance circuit detects the pulse signal. When the AC or DC charging device establishes interaction with the vehicle to be charged via communication, the control guidance circuit detects the duty cycle of the pulse signal and the content of the communication message. The process of detecting this communication method is specifically as follows: In step S3, the guidance circuit selection module, if a pulse signal is detected within a certain period of time, the process further includes:

[0055] The duty cycle of the pulse signal and the content of the communication message are detected. If the duty cycle is within the digital communication standard range and the message is identified as DC charging, the circuit switches to the DC guidance circuit; otherwise, it switches to the AC guidance circuit. In this embodiment, the digital communication standard range is the range of normal duty cycles corresponding to digital communication. The duty cycle within the digital communication standard range is 5%. The communication method includes PLC, Ethernet, or other methods.

[0056] Step S4, in the charging preparation module, includes changing the switch state to allow charging. When the charging device is connected to the vehicle to be charged via a cable, the charging preparation also includes detecting the cable capacity. In this embodiment, setting the open and closed states of switch S2 is used to switch the vehicle to be charged between allowed and prohibited charging states. Switch Sv is set to the closed state, and the cable capacity is detected based on the voltage at monitoring point 3 to determine the cable capacity level.

[0057] In step S5, in the charging circuit selection module, if charging is performed using a DC charging circuit, the DC charging process specified in Appendix C or Appendix H of GB / T18487.1-2023 will be entered.

[0058] In this embodiment, the power supply circuit consists of DC+ and DC- circuits. The pulse signal is a PWM pulse signal. The vehicle to be charged establishes a connection with the charging equipment through the vehicle-to-pile connection. To meet flexible charging needs, the control guidance circuit in the vehicle to be charged is equivalent to low voltage, used to determine the vehicle-to-pile connection status signal, such as the connection voltage. The power supply circuit is the high voltage part, providing the power output circuit. The vehicle-to-pile first confirms the interface connection status through the detection point in the control guidance circuit, and then the charging equipment initiates communication or outputs a PWM pulse signal. The vehicle-to-pile detects the signal through the control guidance circuit until the charging conditions are met, at which point the vehicle to be charged prepares for charging, including closing the switches on the power supply circuits of both the vehicle and the pile. Afterwards, the AC / DC detection circuit in the vehicle to be charged mainly monitors the actual charging voltage type output from the charging equipment. Once the charging conditions are met, it switches to the corresponding charging circuit for connection and begins charging. For example, when the AC / DC detection circuit in the vehicle to be charged detects that the power supply circuit voltage type is AC, it switches to the AC charging circuit and connects the on-board charger to AC charge the power battery. In this invention, DC+ is used as AC single-phase charging L and DC- is used as AC single-phase charging N in the ChaoJi charging interface. After the charging interface is fully plugged in, the vehicle to be charged can determine the type of charging equipment connected by detecting the PWM signal and its duty cycle on the CC1 circuit. Both parties can also confirm the interactive version through digital communication.

Claims

1. A hybrid AC / DC charging method based on the ChaoJi charging interface, characterized in that, The method includes the following steps: S1. Obtain the vehicle to be charged, the charging equipment, and the ChaoJi charging interface. The vehicle to be charged is equipped with a control guidance circuit and a power supply circuit. An AC / DC detection circuit and an AC / DC switching circuit are set in the power supply circuit. The charging device includes an AC charging device and / or a DC charging device; the control and guidance circuit includes a DC guidance circuit and an AC guidance circuit, and can freely switch between the DC guidance circuit and the AC guidance circuit; the AC / DC switching circuit includes a DC charging circuit and an AC charging circuit, and can freely switch between the DC charging circuit and the AC charging circuit. S2. Connect the charging device to the vehicle to be charged using the ChaoJi charging interface. The control guidance circuit detects the connection voltage. If it is not within the standard range, an abnormality is detected and the operation is stopped; otherwise, proceed to step S3. S3. The control and guidance circuit is used to detect pulse signals. If no pulse signal is detected within a certain period of time, the circuit switches to the DC guidance circuit; otherwise, the circuit switches to the AC guidance circuit. S4. The vehicle to be charged prepares for charging, and the charging equipment starts to output charging voltage. S5. The charging voltage is detected using the AC / DC detection circuit. When the control and guidance circuit is a DC guidance circuit, if the charging voltage is within the AC charging voltage range, an abnormality is detected and the operation is stopped; otherwise, the circuit is switched to the DC charging circuit and charging begins. When the control and guidance circuit is an AC guidance circuit, if the charging voltage is a DC charging voltage, an abnormality is detected and the operation is stopped; otherwise, the circuit is switched to the AC charging circuit and charging begins.

2. The AC / DC hybrid charging method based on the ChaoJi charging interface according to claim 1, characterized in that, The vehicle to be charged also includes an on-board charger and a power battery.

3. The AC / DC hybrid charging method based on the ChaoJi charging interface according to claim 2, characterized in that, In step S1, the AC / DC detection circuit and AC / DC switching circuit are connected in the vehicle to be charged in the following ways: The power supply circuit is connected to the input terminal of the AC / DC detection circuit, and the input terminal of the AC / DC switching circuit is connected to the output terminal of the AC / DC detection circuit; the power supply circuit is connected to the input terminal of the AC / DC switching circuit, and the on-board charger and the power battery are connected to the output terminal of the AC / DC switching circuit.

4. The AC / DC hybrid charging method based on the ChaoJi charging interface according to claim 2, characterized in that, When switching to the AC charging circuit, the AC / DC switching circuit outputs to the on-board charger; when switching to the DC charging circuit, the AC / DC switching circuit outputs to the power battery.

5. The AC / DC hybrid charging method based on the ChaoJi charging interface according to claim 1, characterized in that, The pre-charging preparation includes changing the switch state to allow charging.

6. The AC / DC hybrid charging method based on the ChaoJi charging interface according to claim 1, characterized in that, When the charging device is connected to the vehicle to be charged via a cable, the pre-charging preparation also includes detecting the cable capacity.

7. The AC / DC hybrid charging method based on the ChaoJi charging interface according to claim 1, characterized in that, In step S3, if a pulse signal is detected within a certain time period, the following steps are also included: The duty cycle of the pulse signal and the content of the communication message are detected. If the duty cycle is within the range of the digital communication standard and the message is identified as DC charging, then the circuit switches to the DC guidance circuit; otherwise, the circuit switches to the AC guidance circuit.

8. The AC / DC hybrid charging method based on the ChaoJi charging interface according to claim 7, characterized in that, In step S2, the standard range is the specified normal charging connection voltage range; in step S3, the digital communication standard range is the specified range of normal duty cycles when using digital communication.

9. The AC / DC hybrid charging method based on the ChaoJi charging interface according to claim 1, characterized in that, The vehicles to be charged include ChaoJi AC charging vehicles and ChaoJi AC / DC multiplexing vehicles.

10. An AC / DC hybrid charging system based on the ChaoJi charging interface, characterized in that, include: A circuit connection module is used to acquire the vehicle to be charged, the charging equipment, and the ChaoJi charging interface. The vehicle to be charged is equipped with a control guidance circuit and a power supply circuit. The power supply circuit is equipped with an AC / DC detection circuit and an AC / DC switching circuit. The charging equipment includes an AC charging device and / or a DC charging device. The control guidance circuit includes a DC guidance circuit and an AC guidance circuit, and can freely switch between the DC guidance circuit and the AC guidance circuit. The AC / DC switching circuit includes a DC charging circuit and an AC charging circuit, and can freely switch between the DC charging circuit and the AC charging circuit. The physical connection module is used to connect the charging device to the vehicle to be charged using the ChaoJi charging interface. The control guidance circuit detects the connection voltage. If it is not within the standard range, an abnormality is detected and the operation is stopped; otherwise, the process enters the guidance circuit selection module. The guide circuit selection module is used to detect pulse signals using the control guide circuit. If no pulse signal is detected within a certain period of time, it switches to the DC guide circuit; otherwise, it switches to the AC guide circuit. A charging preparation module is used to prepare the vehicle to be charged for charging, and the charging device starts to output charging voltage. The charging circuit selection module is used to detect the charging voltage using the AC / DC detection circuit. When the control guidance circuit is a DC guidance circuit, if the charging voltage is within the AC charging voltage range, an abnormality is detected and operation is stopped; otherwise, the circuit switches to the DC charging circuit and charging begins. When the control guidance circuit is an AC guidance circuit, if the charging voltage is a DC charging voltage, an abnormality is detected and operation is stopped; otherwise, the circuit switches to the AC charging circuit and charging begins.

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