Electric automobile charging circuit

Abstract

The utility model discloses a charging circuit for an electric automobile. The charging circuit comprises a plurality of charging plugs, a detection module, a main logic control module, a communication module and a power supply module, the output end of each charging plug is connected with the corresponding input end of the detection module, the input end of each charging plug is connected with the corresponding output end of the power supply module, and the communication end of each charging plug is connected with the corresponding output end of the communication module; the output end of the detection module is connected with the detection end of the main logic control module; the communication control end of the main logic control module is connected with the input end of the communication module, and the communication end of the main logic control module is connected with the communication end of the communication module; the power supply control end of the main logic control module is connected with the input end of the power supply module. According to the utility model, the plurality of charging plugs are arranged, so that the requirement that the next vehicle can be automatically charged after one vehicle is fully charged is met, and the use efficiency of the charging pile is improved.

Description

Technical Field

[0001] The utility model relates to the field of charging pile control, in particular to a charging circuit for an electric vehicle. Background Art

[0002] With growing environmental awareness and government support for new energy vehicles, electric vehicles are becoming a popular choice for transportation. However, the limited range of electric vehicles limits their use, and a lack of charging infrastructure has also hampered their development. In large parking lots, such as those at supermarkets and office buildings, a single charging station serves multiple parking spaces. Traditional electric vehicle charging stations typically use a single charging port and can only charge one electric vehicle at a time. This can lead to the station becoming idle due to inappropriate disconnection of the charging plug after a full charge. This, in turn, prevents the charging plug from automatically charging the next vehicle, resulting in low charging pile utilization. Furthermore, when charging is needed in large parking lots, the charging plug is often already in use by other vehicles, requiring repeated checks to identify any unused charging plugs, which can be time-consuming. If an unused charging plug is found, users must return to the parking lot to reconnect. In large parking lots, especially during peak hours, it can be difficult to find an available charging plug, significantly impacting productivity. Utility Model Content

[0003] The embodiments of the present invention provide a charging circuit, device and equipment with multiple charging plugs. By setting up multiple charging plugs, the requirement of automatically charging the next car after one car is fully charged can be met without manual intervention, thereby improving the utilization efficiency of the charging pile.

[0004] To achieve the above-mentioned object, a first aspect of an embodiment of the present application provides an electric vehicle charging circuit, comprising a plurality of charging plugs, a detection module, a main logic control module, a communication module and a power supply module;

[0005] The output end of each charging plug is connected to the corresponding input end of the detection module, the input end of each charging plug is connected to the corresponding output end of the power supply module, and the communication end of each charging plug is connected to the corresponding output end of the communication module;

[0006] Several output ends of the detection module are respectively connected to the corresponding detection ends of the main logic control module; several communication control ends of the main logic control module are respectively connected to the corresponding input ends of the communication module, and the communication end of the main logic control module is connected to the communication end of the communication module; several power supply control ends of the main logic control module are connected to the corresponding input ends of the power supply module.

[0007] After an electric vehicle is connected to a charging station, the output of the charging plug transmits information such as the connection status to the detection module. The detection module then sends this information to the main logic control module through its output. Based on this information and pre-set logic, the main logic control module sends instructions to the communication module via the communication control terminal and simultaneously sends control signals to the power supply module via the power supply control terminal. The communication module exchanges data according to the instructions from the main logic control module. Based on the control signals, the power supply module provides appropriate power to charge the electric vehicle. This design ensures that once one vehicle is fully charged, the next vehicle can automatically charge, eliminating the need for human intervention and improving the efficiency of the charging station.

[0008] In one possible implementation, the detection module includes several parallel detection sub-modules; the input end of each detection sub-module is connected to the output end of the corresponding charging plug, and the output end of each detection sub-module is connected to the corresponding detection end of the main logic control module. This implementation improves the system's processing capability and reliability by allocating detection tasks to multiple parallel detection sub-modules.

[0009] In one possible implementation, each detection submodule includes a first voltage source and a first resistor. The output of the first voltage source is connected to one end of the first resistor, the other end of which is connected to the corresponding detection terminal of the main logic control module, and the other end of which is connected to the output of the corresponding charging plug. The main logic control module receives voltage signals from each detection submodule, which reflect the status of each charging plug. Based on these voltage signals, the main logic control module determines whether the charging plug is connected, the current level, and other information, and makes appropriate control decisions accordingly. This allows for real-time monitoring of the charging plug status, providing immediate feedback on the charging process.

[0010] In a possible implementation, the communication module includes several communication switch submodules and communication submodules;

[0011] The communication end of the communication submodule is connected to the communication end of the main logic control module, and the output end of the communication submodule is respectively connected to the communication end of each of the communication switch submodules;

[0012] The input of each communication switch submodule is connected to the corresponding communication control terminal of the main logic control module, and the output of each communication switch submodule is connected to the communication terminal of the corresponding charging plug. By using the communication switch submodules, communication with each charging plug can be flexibly controlled to enable or disable data transmission. The number of communication submodules and communication switch submodules can be easily increased or decreased to accommodate the needs of charging stations of different sizes.

[0013] In one possible implementation, the communication submodule includes a communication logic controller, a common-mode inductor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a first Zener diode, a second Zener diode, a third Zener diode, a fourth Zener diode, a second capacitor, and a third capacitor;

[0014] One end of the second resistor is connected to the first communication end of the main logic control module, and the other end of the second resistor is connected to the first communication end of the communication logic controller;

[0015] One end of the third resistor is connected to the second communication end of the main logic control module, and the other end of the third resistor is connected to the second communication end of the communication logic controller;

[0016] The low level end of the communication logic controller is connected to the first core wire external terminal of the common mode inductor, and the high level end of the communication logic controller is connected to the first shielding layer external terminal of the common mode inductor;

[0017] The second core wire external terminal of the common-mode inductor is connected to one end of the fourth resistor, the second core wire external terminal of the common-mode inductor is connected to the cathode of the first Zener diode, the second core wire external terminal of the common-mode inductor is connected to one end of the first capacitor, the second shielding layer external terminal of the common-mode inductor is connected to one end of the fifth resistor, the second shielding layer external terminal of the common-mode inductor is connected to the cathode of the second Zener diode, and the second shielding layer external terminal of the common-mode inductor is connected to one end of the second capacitor;

[0018] The other end of the fourth resistor is connected to the other end of the fifth resistor, and the other end of the fourth resistor is connected to one end of the third capacitor; the other end of the third capacitor is grounded;

[0019] The anode of the first voltage stabilizing diode is connected to the anode of the third voltage stabilizing diode;

[0020] The cathode of the third zener diode is connected to the cathode of the fourth zener diode, the cathode of the third zener diode is connected to the other end of the first capacitor, and the cathode of the third zener diode is connected to the other end of the second capacitor; the other end of the second capacitor is grounded;

[0021] The anode of the fourth voltage stabilizing diode is connected to the anode of the second voltage stabilizing diode;

[0022] One end of the second capacitor is connected to the first communication ends of the plurality of communication switch submodules respectively; and one end of the first capacitor is connected to the second communication ends of the plurality of communication switch submodules respectively.

[0023] This design, through the use of multiple electronic components and complex interconnections, aims to achieve the following goals: improve signal integrity and stability; suppress noise and interference to ensure communication reliability; provide a stable power supply or reference voltage through Zener diodes and capacitors; and achieve flexible control of signal paths through the communication switch submodule. This design may be suitable for communication systems requiring high reliability and interference immunity, such as those in industrial environments or complex electromagnetic environments.

[0024] In a possible implementation, each of the communication switch submodules includes a fourth capacitor, a sixth resistor, a first transistor, a first diode, a second voltage source, a fifth capacitor, a first relay, and a first switch group;

[0025] One end of the fourth capacitor is connected to one end of the sixth resistor, and the other end of the fourth capacitor is connected to the emitter of the first transistor;

[0026] The other end of the sixth resistor is connected to the base of the first transistor;

[0027] The collector of the first transistor is connected to the anode of the first diode, and the collector of the first transistor is connected to the first coil terminal of the first relay;

[0028] The second coil terminal of the first relay is connected to the input end of the second voltage source, the second coil terminal of the first relay is connected to one end of the fifth capacitor, the second coil terminal of the first relay is connected to the cathode of the first diode, and the normally open contact of the first relay is connected to the controlled end of the first switch group;

[0029] The other end of the fifth capacitor is grounded;

[0030] The other end of the fourth capacitor is connected to the corresponding communication control end of the main logic control module;

[0031] The input end of the first switch group is connected to the communication end signal of the communication submodule, and the output end of the first switch group is connected to the communication end signal of the corresponding charging plug.

[0032] This design allows the main logic control module to flexibly open or cut off the communication connection with the charging plug by controlling the conduction state of the first transistor, thereby achieving precise control of the communication path.

[0033] In one possible implementation, the first switch group includes a first switch and a second switch; the input end of the first switch is signal-connected to the first communication end of the communication submodule, and the input end of the second switch is signal-connected to the second communication end of the communication submodule; the output end of the first switch is signal-connected to the first communication end of the corresponding charging plug, and the output end of the second switch is signal-connected to the second communication end of the corresponding charging plug; the controlled end of the first switch is connected to the normally open contact of the first relay, and the controlled end of the second switch is connected to the normally open contact of the first relay.

[0034] The advantage of this design is that it can centrally manage communications for multiple charging plugs through simple relay control, facilitating maintenance and safety control. Furthermore, the use of switch groups allows for easy expansion to more charging plugs through software control without changing the hardware structure.

[0035] In a possible implementation, the power supply module includes several DC switch submodules;

[0036] The input end of each DC switch submodule is connected to the corresponding DC control end of the main logic control module, and the output end of each DC switch submodule is connected to the input end of the corresponding charging plug.

[0037] The power supply module design containing multiple DC switching submodules can achieve more precise power control and more efficient resource utilization, which is particularly suitable for scenarios such as large charging stations or electric vehicle charging networks.

[0038] In a possible implementation, each of the DC switch submodules includes a sixth capacitor, a seventh resistor, a second transistor, a second diode, a third voltage source, a seventh capacitor, a second relay, a second switch group, and a DC power supply;

[0039] One end of the sixth capacitor is connected to one end of the seventh resistor, and the other end of the sixth capacitor is connected to the emitter of the second transistor;

[0040] The other end of the seventh resistor is connected to the base of the second transistor;

[0041] The collector of the second transistor is connected to the anode of the second diode, and the collector of the second transistor is connected to the first coil terminal of the second relay;

[0042] The second coil terminal of the second relay is connected to the input end of the third voltage source, the second coil terminal of the second relay is connected to one end of the seventh capacitor, the second coil terminal of the second relay is connected to the cathode of the second diode, and the normally open contact of the second relay is connected to the controlled end of the second switch group;

[0043] The other end of the seventh capacitor is grounded;

[0044] The input end of the second switch group is connected to the output end of the DC power supply, and the output end of the second switch group is connected to the input end of the corresponding charging plug;

[0045] The other end of the sixth capacitor is connected to the corresponding DC control end of the main logic control module.

[0046] When the main logic control module sends a control signal to the sixth capacitor, the base of the second transistor is biased via the seventh resistor, turning the transistor on. Once the second transistor is turned on, current flows from the DC power supply through the transistor to the first coil terminal of the second relay, activating the relay coil. The coil energizes, closing the normally open contacts of the second relay, turning on the second switch group. This allows power from the DC power supply to be transferred to the corresponding charging plug, initiating the charging process. This design achieves precise control of the charging plug using simple electronic components, ensuring safe and efficient power transmission.

[0047] In one possible implementation, the second switch group includes a third switch and a fourth switch; an input end of the third switch is connected to an output end of a DC power supply, and an input end of the fourth switch is connected to an output end of the DC power supply; an output end of the third switch is connected to a first input end of a corresponding charging plug, and an output end of the fourth switch is connected to a second input end of the corresponding charging plug; a controlled end of the third switch is connected to a normally open contact of the second relay, and a controlled end of the fourth switch is connected to a normally open contact of the second relay.

[0048] Under normal circumstances, the normally open contact of the second relay is open, so neither the third nor the fourth switch is turned on, and the charging plug receives no power. When the coil of the second relay receives sufficient current (for example, through conduction of the second transistor Q2), the normally open contact closes. After the normally open contact closes, the controlled terminals of the third and fourth switches receive a signal, causing both switches to turn on simultaneously. Once the third and fourth switches are turned on, power from the DC power supply flows through the third and fourth switches, respectively, to the first and second input terminals of the charging plug, initiating the charging process. This design ensures synchronized power transmission because the third and fourth switches are controlled by the same relay, meaning both input terminals of the charging plug are connected or disconnected simultaneously, ensuring stable and balanced power transmission. This allows the system to precisely control the power supply to the charging plug according to instructions from the main logic control module, while ensuring circuit safety and efficiency. This design is particularly suitable for applications requiring high reliability and precise control, such as charging socket control in electric vehicle charging stations.

[0049] Compared to the prior art, the electric vehicle charging circuit provided by the present invention uses a detection module to detect whether an electric vehicle is connected to a charging plug and the charging requirements of the electric vehicle, and transmits a signal to a main logic control module. The main logic control module controls the operation of the communication module and the power supply module based on the feedback information from the detection module to realize an automated charging process. The communication module is used to realize data communication between the charging plug and the main logic control module. The power supply module controls the on and off of the DC power supply according to the instructions of the main logic control module to realize charging of the electric vehicle. Under the instructions of the main logic control module, the detection module, the communication module, and the power supply module cooperate with each other to automatically identify which charging plugs are plugged in, turn on or off the communication and power supply as needed, and independently control the DC power supply for each charging plug. This can meet the needs of scenarios where multiple charging devices are managed simultaneously, such as electric vehicle charging stations and mobile device charging stations. It can automatically identify and respond to charging requirements without manual intervention, greatly improving the efficiency and convenience of charging piles, and is very suitable for the deployment and management of large-scale charging facilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a connection diagram of a charging circuit for multiple charging plugs provided by an embodiment of the present invention;

[0051] Figure 2 This is a schematic diagram of the internal structure of a charging circuit of a multi-charging plug provided by an embodiment of the present utility model;

[0052] Figure 3 This is a schematic diagram of the structure of a logic controller of a charging circuit of multiple charging plugs provided by an embodiment of the present invention;

[0053] Figure 4 This is a schematic structural diagram of a detection module provided by an embodiment of the present utility model;

[0054] Figure 5 This is a schematic structural diagram of a communication switch control subcircuit provided by an embodiment of the present invention;

[0055] Figure 6 This is a schematic structural diagram of a communication sub-circuit provided by an embodiment of the present utility model;

[0056] Figure 7 The figure is a schematic structural diagram of a power supply module provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0058] To solve the above problem, see Figure 1-4 An embodiment of the present invention provides an electric vehicle charging circuit, comprising a plurality of charging plugs 1, a detection module 2, a main logic control module 3, a communication module 4 and a power supply module 5.

[0059] The output end (CC1) of each charging plug 1 is connected to the corresponding input end of the detection module 2, the input end (charging plug DC+ and charging plug DC-) of each charging plug 1 is connected to the corresponding output end of the power supply module 5, and the communication end (charging plug S+ and charging plug S-) of each charging plug 1 is connected to the corresponding output end of the communication module 4.

[0060] Several output terminals of the detection module 2 ( Figure 4 Ports CC1-AD1 to CC1-AD8) in the main logic control module are respectively connected to the corresponding detection terminals of the main logic control module 3; several communication control terminals of the main logic control module 3 are respectively connected to the corresponding input terminals (DO1-DO8) of the communication module 4, and the communication terminals (port MCU_TXD and port MCU_RXD) of the main logic control module 3 are connected to the communication terminals (TXD and RXD) of the communication module; several power supply control terminals of the main logic control module 3 are connected to the corresponding input terminals (DO11-DO18) of the power supply module 5.

[0061] Charging plug 1 is the interface between the electric vehicle and the charging station. It has an output terminal (CC1), input terminals (charging plug DC+ and charging plug DC-), and communication terminals (charging plug S+ and charging plug S-). Detection module 2: Responsible for detecting the status of the charging plug, its output terminals (CC1-AD1 to CC1-AD8) are connected to the detection terminals of the main logic control module. Main logic control module 3 is the control center of the entire charging circuit, responsible for controlling and coordinating the operations of various modules. It receives signals from the detection module and controls communication module 4 and power supply module 5 based on these signals. Communication module 4 is responsible for handling communication tasks during the charging process, including communication with the electric vehicle and possible remote communication. Main logic control module 3 is connected to the input terminals (DO1-DO8) of communication module 4 via the communication control terminal to control the communication process. Power supply module 5 is responsible for providing the power required for charging. Its input terminals (DO11-DO18) receive control signals from the main logic control module to adjust the power output to the charging plug.

[0062] The main logic control module 3 receives information from the detection module 2 and makes decisions based on this information. The main logic control module 3 is connected to the detection module 2 via several detection terminals to receive detection results. Furthermore, it is connected to the communication module 4 via several communication control terminals to control the communication process. The communication output and input terminals of the main logic control module 3 are used to exchange data with the communication module 4. Finally, through several DC control terminals, the main logic control module 3 controls the power supply module 5. The built-in program determines when to supply power to which charging plug.

[0063] When an electric vehicle is connected to the charging plug, detection module 2 detects this change via the CC1 pin and sends a signal to main logic control module 3. Based on this detection information, main logic control module 3 sends a signal to communication module 4 via the communication control terminal to initiate communication with the electric vehicle. Communication module 4 exchanges charging requirements and status information with the electric vehicle via the charging plug's S+ and S- pins. Based on this communication data, main logic control module 3 sends a signal to power supply module 5 via the power supply control terminal to control the supply of DC power. Power supply module 5, in response to the command, provides appropriate DC power to the charging plug, initiating the charging process.

[0064] The utility model provides an electric vehicle charging circuit charging system that can automatically identify and respond to the charging needs of the electric vehicle without manual intervention, thereby improving the charging efficiency and the utilization rate of the charging pile.

[0065] For example, see Figure 4 The detection module 2 includes several parallel detection submodules; the input end of each detection submodule is connected to the output end CC1 of the corresponding charging plug, and the output end of each detection submodule ( Figure 4 Ports CC1-AD1 to CC1-AD8 in the main logic control module are connected to corresponding detection terminals of the main logic control module.

[0066] Detection Module 2 is responsible for detecting whether a charging plug is inserted into the system. It connects to specific pins on several charging plugs (e.g., CC1) and determines whether a plug is inserted by detecting changes in voltage or current on those pins. Once a plug is detected, it transmits this information to Main Logic Control Module 3 via its output. Main Logic Control Module 3 also records the time when the voltage on CC1 reaches 4V. This allows it to record the time each charging plug is inserted into the electric vehicle, thereby determining the charging order of each plug.

[0067] For example, taking charging plug #1 among the plurality of charging plugs 1 as an example, the detection submodule corresponding to charging plug #1 includes a first voltage source and a first resistor R32; the output end of the first voltage source is connected to one end of the first resistor R32, the other end of the first resistor R32 is connected to the corresponding detection end of the main logic control module, and the other end of the first resistor R32 is connected to the output end of the corresponding charging plug #1.

[0068] When the #1 charging plug is not connected to the electric vehicle, the CC1 pin will be directly connected to the first voltage source, forming a voltage divider circuit through R32, so the voltage detected by the main logic control module 3 is close to the voltage value of the first voltage source minus the voltage drop on R32.

[0069] When an electric vehicle is connected to charging plug #1, the electric vehicle's charging control system is connected to pin CC1. At this point, an internal resistor in the electric vehicle's charging control circuit forms a new voltage divider circuit with R32. Since the electric vehicle's internal resistance is typically much smaller than R32, the voltage on pin CC1 drops significantly, a change that is detected by the main logic control module 3.

[0070] By monitoring the voltage changes at detection terminals CC1-AD1 through CC1-AD8, the main logic control module 3 determines whether an electric vehicle is connected to the corresponding charging plug and identifies the electric vehicle's charging needs or status based on the magnitude of the voltage change. This circuit design enables the charging station to automatically detect and respond to electric vehicle connections, thus achieving automated and intelligent charging services.

[0071] For example, see Figure 5 and Figure 6 The communication module 4 includes several communication switch sub-modules and communication sub-modules.

[0072] The communication end of the communication submodule is connected to the communication end of the main logic control module 3, and the output end of the communication submodule is respectively connected to the communication end signal of each of the communication switch submodules.

[0073] The input end of each communication switch submodule is connected to the corresponding communication control end of the main logic control module, and the output end (CAN_H and CAN_L) of each communication switch submodule is respectively connected to the communication end signal of the corresponding charging plug 1.

[0074] Communication module 4 establishes a communication link between main logic control module 3 and charging plug 1. It can be based on any standard communication protocol, such as USB PD, QC, or PFC, and is used to send and receive data to determine charging requirements, status information, and more. Main logic control module 3 can control the communication control terminal to open or close the communication link, thereby saving power or enabling necessary data exchange.

[0075] For example, see Figure 5 The communication submodule includes a communication logic controller U7, a common-mode inductor L1, a second resistor R65, a third resistor R63, a fourth resistor R64, a fifth resistor R66, a first capacitor C76, a first Zener diode, a second Zener diode, a third Zener diode, a fourth Zener diode, a second capacitor C78 and a third capacitor C77.

[0076] One end of the second resistor R65 is connected to the first communication end of the main logic control module 3 , and the other end of the second resistor R65 is connected to the first communication end of the communication logic controller U7 .

[0077] One end of the third resistor R63 is connected to the second communication end of the main logic control module 3 , and the other end of the third resistor R63 is connected to the second communication end of the communication logic controller U7 .

[0078] The low level terminal CANL of the communication logic controller U7 is connected to the first core wire external terminal of the common mode inductor L1, and the high level terminal CANH of the communication logic controller U7 is connected to the first shielding layer external terminal of the common mode inductor L1.

[0079] The second core wire external terminal of the common-mode inductor L1 is connected to one end of the fourth resistor R64, the second core wire external terminal of the common-mode inductor L1 is connected to the cathode of the first Zener diode, the second core wire external terminal of the common-mode inductor L1 is connected to one end of the first capacitor C76, the second shielding layer external terminal of the common-mode inductor L1 is connected to one end of the fifth resistor R66, the second shielding layer external terminal of the common-mode inductor L1 is connected to the cathode of the second Zener diode, and the second shielding layer external terminal of the common-mode inductor L1 is connected to one end of the second capacitor C78.

[0080] The other end of the fourth resistor R64 is connected to the other end of the fifth resistor R66 , and the other end of the fourth resistor is connected to one end of the third capacitor C77 ; the other end of the third capacitor C77 is grounded.

[0081] The anode of the first voltage stabilizing diode is connected to the anode of the third voltage stabilizing diode.

[0082] The cathode of the third zener diode is connected to the cathode of the fourth zener diode, the cathode of the third zener diode is connected to the other end of the first capacitor C76, and the cathode of the third zener diode is connected to the other end of the second capacitor C78; the other end of the second capacitor C78 is grounded.

[0083] The anode of the fourth voltage stabilizing diode is connected to the anode of the second voltage stabilizing diode.

[0084] One end of the second capacitor C78 is connected to the first communication ends of the plurality of communication switch submodules; one end of the first capacitor C76 is connected to the second communication ends of the plurality of communication switch submodules.

[0085] When the main logic control module 3 needs to communicate with a specific charging plug 1, it sends data to the communication submodule's communication logic controller U7 via the communication terminals (ports MCU_TXD and MCU_RXD). The data is then transmitted to the corresponding charging plug via the CAN bus (CAN_H and CAN_L). The data received by the main logic control module 3 from the charging plug 1 is transmitted to the communication submodule via the CAN bus. After processing by the communication logic controller U7, it is returned to the main logic control module 3 via the communication terminals. The main logic control module 3 sends control signals to the communication switch submodule via control ports (DO1-DO8), controlling the connection and disconnection of the CAN bus and enabling communication with the specific charging plug. This design ensures flexible and reliable communication, allowing the main logic control module 3 to selectively establish communication with any charging plug 1 as needed. Furthermore, through the protection of components such as common-mode inductors, Zener diodes, and capacitors, the circuit's anti-interference capability and durability are improved.

[0086] For example, see Figure 6 The communication switch submodule includes a fourth capacitor C45, a sixth resistor R49, a first transistor Q4, a first diode D11, a second voltage source, a fifth capacitor C43, a first relay S4 and a first switch group.

[0087] One end of the fourth capacitor C45 is connected to one end of the sixth resistor R49 , and the other end of the fourth capacitor C45 is connected to the emitter of the first transistor Q4 .

[0088] The other end of the sixth resistor R49 is connected to the base of the first transistor Q4.

[0089] The collector of the first transistor Q4 is connected to the anode of the first diode D11 , and the collector of the first transistor Q4 is connected to the first coil terminal of the first relay S4 .

[0090] The second coil terminal of the first relay S4 is connected to the input end of the second voltage source, the second coil terminal of the first relay S4 is connected to one end of the fifth capacitor C43, the second coil terminal of the first relay S4 is connected to the cathode of the first diode D11, and the normally open contact of the first relay S4 is connected to the controlled end of the first switch group.

[0091] The other end of the fifth capacitor C43 is grounded.

[0092] The other end of the fourth capacitor C45 is connected to the corresponding communication control end of the main logic control module 3 .

[0093] The input end of the first switch group is connected to the communication end signal of the communication submodule, and the output end of the first switch group is connected to the communication end signal of the corresponding charging plug 1.

[0094] When the main logic control module 3 sends a signal through the communication control terminal, the signal passes through the fourth capacitor C45 and reaches the base of the first transistor Q4. If the signal strength is sufficient to turn on Q4, current will flow through Q4, activating the first relay S4. The normally open contacts of S4 close, allowing the first switch group to connect, thus establishing a communication path from the communication submodule to the charging plug 1. Conversely, when Q4 is turned off, the normally open contacts of S4 open, severing the communication path. This design allows the main logic control module 3 to dynamically control communication with the charging plug as needed, improving system flexibility and efficiency.

[0095] Exemplarily, the first switch group includes a first switch K5 and a second switch K6; the input end of the first switch K5 is signal-connected to the first communication end of the communication submodule, and the input end of the second switch K6 is signal-connected to the second communication end of the communication submodule; the output end of the first switch K5 is signal-connected to the first communication end of the corresponding charging plug, and the output end of the second switch K6 is signal-connected to the second communication end of the corresponding charging plug; the controlled end of the first switch K5 is connected to the normally open contact of the first relay S4, and the controlled end of the second switch K6 is connected to the normally open contact of the first relay S4.

[0096] By default, the normally open contacts of first relay S4 are disconnected, and therefore the first and second switches K5 and K6 are also disconnected, preventing communication between the charging plug and the communication submodule. When the main logic control module 3 needs to communicate with a charging plug, it sends a signal to the fourth capacitor C45 via the communication control terminal, which in turn controls the base of the first transistor Q4. If the signal is strong enough, Q4 will turn on, allowing current from the second voltage source to flow through Q4, activating the coil of first relay S4. The normally open contacts of S4 close, activating the first and second switches K5 and K6, allowing signals to be transmitted from the communication submodule to the charging plug and vice versa, thus establishing a communication path. When communication is complete, the main logic control module 3 stops sending control signals, Q4 turns off, and S4's coil loses current, opening its normally open contacts. K5 and K6 then disconnect, interrupting the communication path. This design allows the main logic control module 3 to dynamically control the communication connection with each charging plug, improving the flexibility and efficiency of the system, ensuring that communication with a specific charging plug is performed only when needed, saving resources and reducing unnecessary signal interference.

[0097] Exemplarily, the power supply module 5 includes several DC switch sub-modules.

[0098] The input end of each DC switch submodule is connected to the corresponding DC control end of the main logic control module, and the output end of each DC switch submodule is connected to the input end of the corresponding charging plug.

[0099] The power supply module 5 is responsible for distributing DC power to the various charging plugs. The main logic control module 2 controls these power supply circuits via the DC control terminals, deciding when to start or stop powering a specific charging plug. This typically involves controlling the switching power supply to adjust the output voltage and current to meet the needs of different charging devices.

[0100] For example, see Figure 2 and Figure 7Each of the DC switch submodules includes a sixth capacitor C46, ​​a seventh resistor R47, a second transistor Q5, a second diode D9, a third voltage source, a seventh capacitor C41, a second relay S2, a second switch group and a DC power supply.

[0101] One end of the sixth capacitor C46 is connected to one end of the seventh resistor R47 , and the other end of the sixth capacitor C46 is connected to the emitter of the second transistor Q5 .

[0102] The other end of the seventh resistor R47 is connected to the base of the second transistor Q5.

[0103] The collector of the second transistor Q5 is connected to the anode of the second diode D9 , and the collector of the second transistor Q5 is connected to the first coil terminal of the second relay S2 .

[0104] The second coil terminal of the second relay S2 is connected to the input end of the third voltage source, the second coil terminal of the second relay S2 is connected to one end of the seventh capacitor C41, the second coil terminal of the second relay S2 is connected to the cathode of the second diode, and the normally open contact of the second relay S2 is connected to the controlled end of the second switch group.

[0105] The other end of the seventh capacitor C41 is grounded.

[0106] The input end of the second switch group is connected to the output end of the DC power supply, and the output end of the second switch group is connected to the input end of the corresponding charging plug 1 .

[0107] The other end of the sixth capacitor C46 is connected to the corresponding DC control end of the main logic control module 3 .

[0108] In the default state, the second transistor Q5 is off, the normally open contacts of the second relay S2 are open, and the second switch group is also off, preventing DC power from flowing to the charging plug. When the main logic control module 3 sends a signal through the DC control terminal, the signal passes through the sixth capacitor C46 and reaches the base of the second transistor Q5. If the signal is strong enough, Q5 turns on, allowing current from the third voltage source to flow through Q5, activating the coil of the second relay S2. The normally open contacts of S2 close, allowing the second switch group to connect, allowing DC power to flow through the second switch group to the charging plug, charging the electric vehicle. When charging is complete or power is no longer needed, the main logic control module 3 stops sending control signals, turning off the second transistor Q5, depriving the coil of current, opening its normally open contacts, and disconnecting the second switch group, interrupting the DC power supply. This design allows the main logic control module 3 to dynamically control the power supply to each charging plug, ensuring that power is provided only when needed, improving system efficiency and safety. By using relays and transistors as switches, large currents can be controlled while protecting the circuit from overload or reverse voltage.

[0109] Exemplarily, the second switch group includes a third switch K1 and a fourth switch K2; an input end of the third switch K1 is connected to the output end of the DC power supply, and an input end of the fourth switch K2 is connected to the output end of the DC power supply; an output end of the third switch K1 is connected to the first input end of the corresponding charging plug, and an output end of the fourth switch K2 is connected to the second input end of the corresponding charging plug; a controlled end of the third switch K1 is connected to the normally open contact of the second relay S2, and a controlled end of the fourth switch K2 is connected to the normally open contact of the second relay S2.

[0110] The following takes the charging process of multiple electric vehicles as an example to illustrate the operation process of the present invention:

[0111] The main logic control module 3 determines the charging plug 1 that is first inserted into the vehicle interface through the detection module 2, and then closes the first switch K5 and the second switch K6 corresponding to the charging plug 1 in the communication module 4 (see Figure 6 ), the logic controller starts to periodically send communication messages at S+ and S- through the communication module 4 to communicate with the vehicle controller of the electric vehicle; after the communication is normal, the logic controller closes the third switch K1 and the fourth switch K2 corresponding to the charging plug 1 in the power supply module 5 (see Figure 7 ), the DC power supply circuit is turned on and charging begins. K5, K6 and K1, K2 corresponding to other charging plugs remain disconnected and wait.

[0112] When the battery system of the first vehicle reaches full charge, the vehicle controller sends a command to terminate charging to the charging circuit of the multi-charging plug. Upon receiving this command, the logic controller disconnects K1 and K2, followed by K5 and K6, corresponding to that charging plug. Charging of the first vehicle ends. The logic controller of the multi-charging plug's charging circuit identifies the second charging plug inserted into the vehicle's interface and closes K5 and K6 corresponding to that plug to establish communication. Once communication is established, the logic controller closes K1 and K2 corresponding to that charging plug, energizing the DC power supply circuit and commencing charging. K5 and K6, along with K1 and K2, corresponding to the other charging plugs, remain disconnected, waiting for the next charge.

[0113] When the battery system of the second vehicle reaches a fully charged state, the vehicle controller sends a charge end instruction to the charging circuit of the multi-charging plug. After receiving the instruction, the logic controller disconnects K1 and K2 corresponding to the charging plug, and then disconnects K5 and K6 corresponding to the charging plug. The second vehicle ends charging.

[0114] The same process is repeated to complete the charging of other vehicles. After each vehicle is fully charged, K1, K2, K5, and K6 of all plugs remain disconnected.

[0115] This design allows the system to manage multiple charging plugs simultaneously, ensuring each plug receives a proper and safe charge, while maximizing efficiency and safety through a logic controller. This design is particularly suitable for applications that need to support multiple charging standards and multiple device types, such as electric vehicle charging stations and multi-device charging stations.

[0116] Compared to the prior art, the electric vehicle charging circuit provided by the present invention uses a detection module to detect whether an electric vehicle is connected to a charging plug and the charging requirements of the electric vehicle, and transmits a signal to a main logic control module. The main logic control module controls the operation of the communication module and the power supply module based on the feedback information from the detection module to realize an automated charging process. The communication module is used to realize data communication between the charging plug and the main logic control module. The power supply module controls the on and off of the DC power supply according to the instructions of the main logic control module to realize charging of the electric vehicle. Under the instructions of the main logic control module, the detection module, the communication module, and the power supply module cooperate with each other to automatically identify which charging plugs are plugged in, turn on or off the communication and power supply as needed, and independently control the DC power supply for each charging plug. This can meet the needs of scenarios where multiple charging devices are managed simultaneously, such as electric vehicle charging stations and mobile device charging stations. It can automatically identify and respond to charging requirements without manual intervention, greatly improving the efficiency and convenience of charging piles, and is very suitable for the deployment and management of large-scale charging facilities.

[0117] An embodiment of the present application provides an electric vehicle charging device, comprising an electric vehicle charging circuit as described above.

[0118] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working process of the device described above can refer to the corresponding process in the aforementioned circuit embodiment and will not be described again here.

[0119] Compared to the prior art, the electric vehicle charging device provided by the present invention uses a detection module to detect whether an electric vehicle is connected to a charging plug and the charging requirements of the electric vehicle, and transmits a signal to a main logic control module. The main logic control module controls the operation of the communication module and the power supply module based on the feedback information from the detection module to realize an automated charging process. The communication module is used to realize data communication between the charging plug and the main logic control module. The power supply module controls the on and off of the DC power supply according to the instructions of the main logic control module to realize charging of the electric vehicle. Under the instructions of the main logic control module, the detection module, the communication module, and the power supply module cooperate with each other to automatically identify which charging plugs are plugged in, turn on or off the communication and power supply as needed, and independently control the DC power supply for each charging plug. This can meet the needs of scenarios where multiple charging devices are managed simultaneously, such as electric vehicle charging stations and mobile device charging stations. It can automatically identify and respond to charging needs without manual intervention, greatly improving the efficiency and convenience of charging piles, and is very suitable for the deployment and management of large-scale charging facilities.

[0120] An embodiment of the present application provides an electric vehicle charging device, including the electric vehicle charging apparatus as described above.

[0121] Since the present driving device can adopt the technical solutions of all the above embodiments, it at least has the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0122] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An electric vehicle charging circuit, characterized in that: include: Several charging plugs, detection modules, main logic control modules, communication modules and power supply modules; The output end of each charging plug is connected to the corresponding input end of the detection module, the input end of each charging plug is connected to the corresponding output end of the power supply module, and the communication end of each charging plug is connected to the corresponding output end of the communication module; Several output ends of the detection module are respectively connected to the corresponding detection ends of the main logic control module; several communication control ends of the main logic control module are respectively connected to the corresponding input ends of the communication module, and the communication end of the main logic control module is connected to the communication end of the communication module; several power supply control ends of the main logic control module are respectively connected to the corresponding input ends of the power supply module.

2. An electric vehicle charging circuit as claimed in claim 1, characterized in that: The detection module includes several parallel detection submodules; the input end of each detection submodule is connected to the output end of the corresponding charging plug, and the output end of each detection submodule is connected to the corresponding detection end of the main logic control module.

3. An electric vehicle charging circuit as claimed in claim 2, characterized in that: The detection submodule includes a first voltage source and a first resistor; the output end of the first voltage source is connected to one end of the first resistor, the other end of the first resistor is connected to the corresponding detection end of the main logic control module, and the other end of the first resistor is connected to the output end of the corresponding charging plug.

4. The electric vehicle charging circuit according to claim 1, wherein: The communication module includes several communication switch submodules and communication submodules; The communication end of the communication submodule is connected to the communication end of the main logic control module, and the output end of the communication submodule is respectively connected to the communication end of each of the communication switch submodules; The input end of each communication switch submodule is connected to the corresponding communication control end of the main logic control module, and the output end of each communication switch submodule is respectively connected to the communication end signal of the corresponding charging plug.

5. The electric vehicle charging circuit according to claim 4, characterized in that: The communication submodule includes a communication logic controller, a common mode inductor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a first Zener diode, a second Zener diode, a third Zener diode, a fourth Zener diode, a second capacitor and a third capacitor; One end of the second resistor is connected to the first communication end of the main logic control module, and the other end of the second resistor is connected to the first communication end of the communication logic controller; One end of the third resistor is connected to the second communication end of the main logic control module, and the other end of the third resistor is connected to the second communication end of the communication logic controller; The low level end of the communication logic controller is connected to the first core wire external terminal of the common mode inductor, and the high level end of the communication logic controller is connected to the first shielding layer external terminal of the common mode inductor; The second core wire external terminal of the common-mode inductor is connected to one end of the fourth resistor, the second core wire external terminal of the common-mode inductor is connected to the cathode of the first Zener diode, the second core wire external terminal of the common-mode inductor is connected to one end of the first capacitor, the second shielding layer external terminal of the common-mode inductor is connected to one end of the fifth resistor, the second shielding layer external terminal of the common-mode inductor is connected to the cathode of the second Zener diode, and the second shielding layer external terminal of the common-mode inductor is connected to one end of the second capacitor; The other end of the fourth resistor is connected to the other end of the fifth resistor, and the other end of the fourth resistor is connected to one end of the third capacitor; the other end of the third capacitor is grounded; The anode of the first voltage stabilizing diode is connected to the anode of the third voltage stabilizing diode; The cathode of the third zener diode is connected to the cathode of the fourth zener diode, the cathode of the third zener diode is connected to the other end of the first capacitor, and the cathode of the third zener diode is connected to the other end of the second capacitor; the other end of the second capacitor is grounded; The anode of the fourth voltage stabilizing diode is connected to the anode of the second voltage stabilizing diode; One end of the second capacitor is connected to the first communication ends of the plurality of communication switch submodules respectively; and one end of the first capacitor is connected to the second communication ends of the plurality of communication switch submodules respectively.

6. An electric vehicle charging circuit as claimed in claim 4, characterized in that: Each of the communication switch submodules includes a fourth capacitor, a sixth resistor, a first transistor, a first diode, a second voltage source, a fifth capacitor, a first relay and a first switch group; One end of the fourth capacitor is connected to one end of the sixth resistor, and the other end of the fourth capacitor is connected to the emitter of the first transistor; The other end of the sixth resistor is connected to the base of the first transistor; The collector of the first transistor is connected to the anode of the first diode, and the collector of the first transistor is connected to the first coil terminal of the first relay; The second coil terminal of the first relay is connected to the input end of the second voltage source, the second coil terminal of the first relay is connected to one end of the fifth capacitor, the second coil terminal of the first relay is connected to the cathode of the first diode, and the normally open contact of the first relay is connected to the controlled end of the first switch group; The other end of the fifth capacitor is grounded; The other end of the fourth capacitor is connected to the corresponding communication control end of the main logic control module; The input end of the first switch group is connected to the communication end signal of the communication submodule, and the output end of the first switch group is connected to the communication end signal of the corresponding charging plug.

7. An electric vehicle charging circuit as claimed in claim 6, characterized in that: The first switch group includes a first switch and a second switch; the input end of the first switch is signal-connected to the first communication end of the communication submodule, and the input end of the second switch is signal-connected to the second communication end of the communication submodule; the output end of the first switch is signal-connected to the first communication end of the corresponding charging plug, and the output end of the second switch is signal-connected to the second communication end of the corresponding charging plug; the controlled end of the first switch is connected to the normally open contact of the first relay, and the controlled end of the second switch is connected to the normally open contact of the first relay.

8. The electric vehicle charging circuit according to claim 1, wherein: The power supply module includes several DC switch submodules; The input end of each DC switch submodule is connected to the corresponding DC control end of the main logic control module, and the output end of each DC switch submodule is connected to the input end of the corresponding charging plug.

9. An electric vehicle charging circuit as claimed in claim 8, characterized in that: Each of the DC switch submodules includes a sixth capacitor, a seventh resistor, a second transistor, a second diode, a third voltage source, a seventh capacitor, a second relay, a second switch group and a DC power supply; One end of the sixth capacitor is connected to one end of the seventh resistor, and the other end of the sixth capacitor is connected to the emitter of the second transistor; The other end of the seventh resistor is connected to the base of the second transistor; The collector of the second transistor is connected to the anode of the second diode, and the collector of the second transistor is connected to the first coil terminal of the second relay; The second coil terminal of the second relay is connected to the input end of the third voltage source, the second coil terminal of the second relay is connected to one end of the seventh capacitor, the second coil terminal of the second relay is connected to the cathode of the second diode, and the normally open contact of the second relay is connected to the controlled end of the second switch group; The other end of the seventh capacitor is grounded; The input end of the second switch group is connected to the output end of the DC power supply, and the output end of the second switch group is connected to the input end of the corresponding charging plug; The other end of the sixth capacitor is connected to the corresponding DC control end of the main logic control module.

10. An electric vehicle charging circuit as claimed in claim 9, characterized in that: The second switch group includes a third switch and a fourth switch; an input end of the third switch is connected to the output end of the DC power supply, and an input end of the fourth switch is connected to the output end of the DC power supply; an output end of the third switch is connected to the first input end of the corresponding charging plug, and an output end of the fourth switch is connected to the second input end of the corresponding charging plug; a controlled end of the third switch is connected to the normally open contact of the second relay, and a controlled end of the fourth switch is connected to the normally open contact of the second relay.

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