A charging adapter of a vehicle and a charging method based on the charging adapter

Abstract

The application provides a charging adapter of a vehicle and a charging method based on the charging adapter and belongs to the technical field of automobiles. The application solves the problem that the existing adapter only plays a connecting role and lacks safety. The charging adapter of the vehicle comprises a control panel, a direct-current connecting end and an alternating-current connecting end. The direct-current connecting end comprises a first communication connecting terminal, a direct-current input terminal DC+ and a direct-current input terminal DC-. The alternating-current connecting end comprises a second communication connecting terminal, an alternating-current output terminal L1 connected with the direct-current input terminal DC+ and a neutral terminal N connected with the direct-current input terminal DC-. The control panel is connected with the direct-current input terminal DC+, the direct-current input terminal DC-, the first communication connecting terminal and the second communication connecting terminal respectively and performs information interaction with a direct-current charging pile and a vehicle-mounted charger respectively so that the direct-current charging pile charges the vehicle. The application improves the safety of the PHEV vehicle model when charging through the direct-current charging pile.

Description

Technical Field

[0001] This invention belongs to the field of automotive technology and relates to a vehicle charging adapter and a charging method based on the charging adapter. Background Technology

[0002] With the rapid development of the new energy vehicle and new energy infrastructure industry, the number of DC charging stations has increased significantly, and the convenience of DC charging is becoming increasingly prominent. However, most plug-in hybrid electric vehicles (PHEVs) in the domestic new energy vehicle market are only equipped with AC slow charging interfaces and only support slow charging. Moreover, many users do not have AC charging piles installed at home and need to go to external charging piles to charge. However, external charging piles are mainly DC fast charging piles, which leads to charging difficulties for PHEV owners.

[0003] To address the aforementioned problems, there are currently two main technical solutions on the market: one is aftermarket installation, which involves developing a transformer to convert DC power to AC power via equipment, and then charging the vehicle. This solution is bulky, costly, and inconvenient to use. The other solution involves developing an adapter to convert DC interface signals to AC interface signals, which are then identified and allocated by the vehicle's PDU and communicate with the vehicle's BMS to achieve direct DC battery charging. For example, a charging adapter and vehicle disclosed in Chinese patent literature (application number 202010615213.0) include: a DC end connection terminal suitable for connection to DC charging equipment, the DC end connection terminal including multiple first terminals, an auxiliary power positive terminal and an auxiliary power negative terminal, and the auxiliary power positive terminal and auxiliary power negative terminal are both unused; an AC end connection terminal suitable for connection to AC charging equipment, the AC end connection terminal including multiple second terminals; wherein, the multiple first terminals and the multiple second terminals are electrically connected one-to-one. Although this charging adapter enables DC charging for vehicles with only AC charging interfaces without modifying the vehicle body mold and shape, it only serves as a connector and lacks a safe and reliable control circuit, thus posing certain risks and having low safety. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a vehicle charging adapter and a charging method based on the charging adapter. The technical problem to be solved is: how to improve the safety of PHEV models charging through DC charging piles.

[0005] The objective of this invention can be achieved through the following technical solution: A vehicle charging adapter includes a DC connection terminal for connecting to a DC charging pile and an AC connection terminal for connecting to an on-board charger. The DC connection terminal includes a first communication connection terminal, a DC input terminal DC+, and a DC input terminal DC-. The AC connection terminal includes a second communication connection terminal, an AC output terminal L1 connected to the DC input terminal DC+, and a neutral terminal N connected to the DC input terminal DC-. The charging adapter also includes a control board, which is connected to the DC input terminals DC+ and DC- respectively, for transmitting analog high-voltage signals to the DC charging pile. The control board is also connected to the first communication connection terminal for information interaction with the DC charging pile to start or stop charging. The control board is also connected to the second communication connection terminal for information interaction with the on-board charger to start or stop charging the power battery.

[0006] When a PHEV vehicle needs charging, first connect the AC connector of the charging adapter to the onboard charger, then connect the DC connector of the charging adapter to the DC charging station. The control board in the charging adapter receives low-voltage power and begins to operate. It interacts with the DC charging station through the first communication terminal in the DC connector, and transmits analog high-voltage signals to the DC charging station through the DC input terminals DC+ and DC-. The DC charging station begins charging when the analog high-voltage signals transmitted through the DC input terminals DC+ and DC- match the interactive information transmitted through the first communication terminal. Simultaneously, the control board communicates through the second communication terminal... The connection terminal interacts with the on-board charger, and after confirming a successful connection, sends a charging confirmation signal to the on-board charger to initiate charging of the power battery. Upon completion of charging, the control board receives a charging stop signal via the second communication connection terminal, and then sends a charging termination signal to the DC charging pile via the first communication connection terminal to end charging. Besides the power battery charging completion, the user can also manually stop charging. The control board receives a stop charging message from the DC charging pile via the first communication connection terminal, and then sends a stop charging signal to the on-board charger. The on-board charger requests the high-voltage relay to disconnect, thus stopping charging the power battery. This vehicle's charging adapter enhances communication with the DC charging pile and the on-board charger, and sends a high-voltage power signal to the DC charging pile via the control board. This satisfies the DC charging pile's requirements for high-voltage battery voltage detection and comparison, enabling PHEV models to charge via DC charging piles. Furthermore, the control board's design allows for timely interaction with the DC charging pile and the on-board charger, making charging safer.

[0007] In the aforementioned vehicle charging adapter, the first communication connection terminal includes communication connection terminals CC1 and CC2 for establishing a communication connection with the DC charging pile, and charging confirmation terminals S+ and S- for exchanging charging information with the DC charging pile. All four communication terminals (CC1, CC2, S+, and S-) are connected to the control board. The control board sends CC1 and CC2 signals to the DC charging pile via communication connection terminals CC1 and CC2. Upon receiving these signals, the DC charging pile initiates communication. Subsequently, according to international charging communication protocols, it exchanges information with the DC charging pile via charging confirmation terminals S+ and S-, including charging parameter configuration information exchange and charging stage information exchange, thus achieving safe control of the charging process.

[0008] In the aforementioned vehicle charging adapter, the second communication connection terminal includes a communication connection terminal CC for establishing a communication connection with the on-board charger and a charging confirmation terminal CP for exchanging charging information with the on-board charger. Both the communication connection terminal CC and the charging confirmation terminal CP are connected to the control board. The control board sends a CC signal to the on-board charger through the communication connection terminal CC. When the on-board charger recognizes the CC signal, it indicates that the charging adapter connection is successful. Subsequently, it sends a CP signal with a duty cycle between 90% and 100% to the on-board charger through the charging confirmation terminal CP. After recognizing the CP signal, the on-board charger enters a DC constant voltage current limiting mode and begins preparing to charge the power battery.

[0009] In the aforementioned vehicle charging adapter, the control board is equipped with a controller, a high-voltage drive module, a high-voltage power supply module for converting low-voltage power to high-voltage power, and a first I / O module, a second I / O module, a CAN communication module, and a digital isolation module connected to the controller. The digital isolation module is connected to the high-voltage power supply module through the high-voltage drive module. The communication connection terminal CC and the charging confirmation terminal CP are both connected to the first I / O module, the communication connection terminals CC1 and CC2 are both connected to the second I / O module, and the charging confirmation terminals S+ and S- are both connected to the CAN communication module. The digital isolation module is used to isolate high and low voltages to ensure the stability of information transmission. The high-voltage power supply module is used to convert 12V power to 258V power, which is then output to the DC input terminals DC+ and DC input terminals DC- to meet the voltage detection and comparison requirements of the DC charging pile for the high-voltage battery, thereby enabling PHEV models to be charged via a DC charging pile.

[0010] In the aforementioned vehicle charging adapter, a unidirectional diode D is also installed on the control board. This unidirectional diode D is connected between the high-voltage power module and the DC input terminal DC+. The positive terminal of the unidirectional diode D is connected to the high-voltage power module, and the negative terminal is connected to the DC input terminal DC+. Placing a diode D before the high-voltage power module effectively prevents reverse current injection into the high-voltage power module after the DC charging pile supplies power.

[0011] In the aforementioned vehicle charging adapter, the control board is also equipped with an LDO power module connected to the controller. The DC connection terminal also includes a low-voltage auxiliary power supply A+ and a low-voltage auxiliary power supply A-, both connected to the LDO power module. The LDO power module is also connected to the CAN communication module.

[0012] In the aforementioned vehicle charging adapter, the DC connection terminal further includes a first grounding terminal PE, and the AC connection terminal further includes a second grounding terminal PE, with the first grounding terminal PE and the second grounding terminal PE connected together.

[0013] A charging method based on a charging adapter includes the following steps:

[0014] Step A: Connect the AC connector of the charging adapter to the on-board charger and proceed to Step C; Connect the DC connector of the charging adapter to the DC charging gun of the DC charging station and proceed to Step B.

[0015] Step B: After the control board of the charging adapter obtains the auxiliary low-voltage power supply of the DC charging pile, it starts to work. It interacts with the DC charging pile through the first communication connection terminal and transmits the analog high-voltage signal to the DC charging pile through the DC input terminals DC+ and DC-. When the DC charging pile detects that the voltage transmitted by the DC input terminals DC+ and DC input terminals DC- is consistent with the information exchanged through the first communication connection terminal, it starts charging.

[0016] Step C: The control board interacts with the on-board charger through the second communication connection terminal. After sending the CP signal to the on-board charger, the vehicle high-voltage relay is activated, thereby enabling the on-board charger to enter the charging state.

[0017] Step D: After charging is completed, when the control board recognizes the high CP signal through the second communication connection terminal, it sends a charging termination signal to the DC charging pile through the first communication connection terminal to end the charging process.

[0018] When a PHEV vehicle needs charging, first connect the AC connector of the charging adapter to the onboard charger, then connect the DC connector of the charging adapter to the DC charging station. The control board in the charging adapter receives low-voltage power and begins to operate. It interacts with the DC charging station through the first communication terminal in the DC connector, and transmits analog high-voltage signals to the DC charging station through the DC input terminals DC+ and DC-. The DC charging station begins charging when the analog high-voltage signals transmitted through the DC input terminals DC+ and DC- match the interactive information transmitted through the first communication terminal. Simultaneously, the control board communicates through the second communication terminal... The connection terminal interacts with the on-board charger, and after confirming a successful connection, sends a charging confirmation signal to the on-board charger to initiate charging of the power battery. Upon completion of charging, the control board receives a charging stop signal via the second communication connection terminal, and then sends a charging termination signal to the DC charging pile via the first communication connection terminal to end charging. Besides the power battery charging completion, the user can also manually stop charging. The control board receives a stop charging message from the DC charging pile via the first communication connection terminal, and then sends a stop charging signal to the on-board charger. The on-board charger requests the high-voltage relay to disconnect, thus stopping charging the power battery. This vehicle's charging adapter enhances communication with the DC charging pile and the on-board charger, and sends a high-voltage power signal to the DC charging pile via the control board. This satisfies the DC charging pile's requirements for high-voltage battery voltage detection and comparison, enabling PHEV models to charge via DC charging piles. Furthermore, the control board's design allows for timely interaction with the DC charging pile and the on-board charger, making charging safer.

[0019] In the above-described charging method based on a charging adapter, the operation of exchanging information with the DC charging pile through the first communication connection terminal includes:

[0020] First, the control board sends CC1 and CC2 signals to the DC charging pile through the communication connection terminals CC1 and CC2 in the first communication connection terminal. When the DC charging pile receives the CC1 and CC2 signals, it begins to establish communication.

[0021] Then the control board sends charging parameter configuration information to the vehicle-mounted charging pile through the charging confirmation terminal S+ and charging confirmation terminal S- in the first communication connection terminal. When the vehicle-mounted charging pile enters the constant voltage and current limiting mode, it exchanges information with the DC charging pile during the charging stage.

[0022] Upon completion of charging, the control board sends a charging termination signal to the DC charging pile via the charging confirmation terminals S+ and S-. The charging parameter configuration information includes the current battery voltage, maximum allowable temperature, maximum allowable total charging voltage, maximum allowable charging current, rated capacity of the power battery system, and battery type. Information exchange during the charging phase includes the exchange of information such as charging mode, voltage requirements, and current requirements.

[0023] In the above-mentioned charging method based on a charging adapter, the operation of the control board interacting with the on-board charger through the second communication connection terminal includes:

[0024] First, the control board sends a CC signal to the on-board charger through the CC communication connection terminal in the second communication connection terminal. When the on-board charger recognizes the CC signal, the charging adapter is successfully connected to the on-board charger.

[0025] The control board then sends a CP signal with a duty cycle between 90% and 100% to the on-board charger via the charging confirmation terminal CP in the second communication connection terminal. Upon recognizing the CP signal, the on-board charger enters a DC constant voltage and current limiting mode. When charging is complete, the on-board charger pulls the CP signal high to 9V, and the control board recognizes this 9V-high CP signal via the charging confirmation terminal CP. Preferably, the duty cycle can be 92%.

[0026] The charging method based on the charging adapter described above further includes the following steps:

[0027] When charging is stopped by active operation, the control board will receive a stop charging message from the DC charging pile through the charging confirmation terminals S+ and S-. The control board will continuously send a 12V high-level CP signal to the on-board charger through the charging confirmation terminal CP, and the on-board charger will stop charging and disconnect the vehicle's high-voltage relay.

[0028] In the above-described charging method based on a charging adapter, the analog voltage signal is a 258V voltage signal.

[0029] Compared with existing technologies, the charging adapter and the charging method based on the charging adapter of this vehicle have the following advantages:

[0030] 1. This invention provides a convenient charging adapter. Inside the charging adapter is a control board, which is mainly responsible for communicating with the DC charging pile and the vehicle's on-board charger. It initiates DC voltage-limiting constant current mode for charging and outputs a CP signal to the vehicle charger to start charging through the DC charging pile. This enables PHEV models to be charged through the DC charging pile, and under the control of the control board, the charging safety is improved.

[0031] 2. The charging adapter designed in this invention is inexpensive, small in size, easy to use, and can also solve the charging problem for vehicles already sold on the market, making it widely applicable. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the present invention.

[0033] In the diagram, 1 is the DC connection terminal; 11 is the first communication connection terminal; 2 is the AC connection terminal; 21 is the second communication connection terminal; 3 is the control board; 31 is the controller; 32 is the high-voltage drive module; 33 is the high-voltage power supply module; 34 is the first I / O module; 35 is the second I / O module; 36 is the CAN communication module; 37 is the digital isolation module; and 38 is the LDO power supply module. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] like Figure 1 As shown, the charging adapter for this vehicle includes a control board 3, a DC connection terminal 1 for connecting to a DC charging pile, and an AC connection terminal 2 for connecting to an on-board charger. The DC connection terminal 1 includes a first communication connection terminal 11, low-voltage auxiliary power supply A+, low-voltage auxiliary power supply A-, a first ground terminal PE, a DC input terminal DC+, and a DC input terminal DC-. The AC connection terminal 2 includes a second communication connection terminal 21, an AC output terminal L1, a neutral terminal N, and a second ground terminal PE. The first ground terminal PE and the second ground terminal PE are connected. The DC input terminal DC+ is connected to the AC output terminal L1, and the DC input terminal DC-... - Connected to the neutral terminal N, the first communication connection terminal 11, the low-voltage auxiliary power supply A+, the low-voltage auxiliary power supply A-, and the second communication connection terminal 21 are all connected to the control board 3. The first communication connection terminal 11 includes communication connection terminals CC1, CC2, charging confirmation terminal S+, and charging confirmation terminal S-, and all three are connected to the control board 3. The second communication connection terminal 21 includes communication connection terminal CC and charging confirmation terminal CP, and both CC and CP are connected to the control board 3.

[0036] The control board 3 is equipped with a controller 31, a unidirectional diode D, a high-voltage drive module 32, a high-voltage power supply module 33 for converting low-voltage power to high-voltage power, and a first I / O module 34, a second I / O module 35, an LDO power supply module 38, a CAN communication module 36, and a digital isolation module 37 connected to the controller 31. The unidirectional diode D is connected between the high-voltage power supply module 33 and the DC input terminal DC+, with the positive terminal of the unidirectional diode D connected to the high-voltage power supply module 33 and the negative terminal of the unidirectional diode D connected to the DC input terminal DC+. The digital isolation module 37 is connected to the high-voltage power supply module 33 through the high-voltage drive module 32. The communication connection terminal CC and the charging confirmation terminal CP are both connected to the first I / O module 34. The communication connection terminals CC1 and CC2 are both connected to the second I / O module 35. The charging confirmation terminals S+ and S- are both connected to the CAN communication module 36. The low-voltage auxiliary power supply A+ and A- are connected to the LDO power supply module 38, which is also connected to the CAN communication module 36 to provide power to it. In this embodiment, the LDO power supply module 38 acts as a linear voltage regulator, outputting low-voltage power to the controller 31 so that the controller 31 can be powered on and start working. In this embodiment, the controller 31 is a microcontroller.

[0037] This charging method based on a charging adapter includes the following steps:

[0038] First, connect the AC connection terminal 2 of the charging adapter to the on-board charger; connect the DC connection terminal 1 of the charging adapter to the DC charging gun of the DC charging pile.

[0039] Afterwards, the control board 3 of the charging adapter starts working after obtaining the auxiliary low-voltage power supply of the DC charging pile. It interacts with the DC charging pile through the first communication connection terminal 11 and transmits the analog high-voltage signal to the DC charging pile through the DC input terminals DC+ and DC-. When the DC charging pile detects that the voltage transmitted by the DC input terminals DC+ and DC input terminals DC- is consistent with the information exchanged by the first communication connection terminal 11, it starts charging.

[0040] The control board 3 interacts with the on-board charger through the second communication connection terminal 21. After sending the CP signal to the on-board charger, the vehicle high-voltage relay is activated, thereby enabling the on-board charger to enter the charging state.

[0041] After charging is completed, when the control board 3 detects the high CP signal through the second communication connection terminal 21, it sends a charging termination signal to the DC charging pile through the first communication connection terminal 11 to end the charging process.

[0042] Alternatively, when charging is stopped by active operation, the control board 3 will receive a message from the DC charging pile indicating that charging has stopped through the charging confirmation terminals S+ and S-. The control board 3 will then continuously send a 12V high-level CP signal to the on-board charger through the charging confirmation terminals, causing the on-board charger to stop charging and disconnect the vehicle's high-voltage relay.

[0043] Specifically, the operation of exchanging information with the DC charging pile through the first communication connection terminal 11 includes:

[0044] First, the control board 3 sends CC1 and CC2 signals to the DC charging pile through the communication connection terminals CC1 and CC2 in the first communication connection terminal 11. When the DC charging pile receives the CC1 and CC2 signals, it begins to establish communication.

[0045] Then, the control board 3 sends the charging parameter configuration information to the vehicle charging pile through the charging confirmation terminal S+ and charging confirmation terminal S- in the first communication connection terminal 11. When the vehicle charging pile enters the constant voltage and current limiting mode, it exchanges information with the DC charging pile during the charging stage.

[0046] When charging is complete, the control board 3 sends a charging termination signal to the DC charging pile through the charging confirmation terminal S+ and the charging confirmation terminal S-.

[0047] The operation of the control board 3 in exchanging information with the on-board charger through the second communication connection terminal 21 includes:

[0048] First, the control board 3 sends a CC signal to the on-board charger through the communication connection terminal CC in the second communication connection terminal 21. When the on-board charger recognizes the CC signal, the charging adapter is successfully connected to the on-board charger.

[0049] Then, the control board 3 sends a CP signal with a duty cycle between 90% and 100% to the on-board charger through the charging confirmation terminal CP in the second communication connection terminal 21. After the on-board charger recognizes the CP signal, it enters the DC constant voltage current limiting mode. When charging is completed, the on-board charger pulls the CP signal high to 9V. The control board 3 recognizes the CP signal that has been pulled high to 9V through the charging confirmation terminal CP.

[0050] The working principle of the vehicle charging adapter and the charging method based on the charging adapter is as follows:

[0051] When using the charging adapter for this vehicle, first connect AC connector 2 of the charging adapter to the on-board charger, such as... Figure 1As shown, the AC output terminal L1, neutral terminal N, second ground terminal PE, communication connection terminal CC, and charging confirmation terminal CP in AC connection terminal 2 are respectively connected to the L1, N, PE, CC, and CP ports of the vehicle's on-board AC socket. Since the on-board AC socket itself is connected to the on-board charger, the AC connection terminal 2 of the charging adapter is essentially connected to the on-board charger.

[0052] Next, connect the DC connector 1 of the charging adapter to the DC charging station, such as... Figure 1 As shown, the DC input terminals DC+ and DC- in DC connection terminal 1 are connected to the DC+ and DC- of the DC charging pile, respectively. The first grounding terminal PE is connected to the PE of the DC charging pile. The low-voltage auxiliary power supply A+ and low-voltage auxiliary power supply A- are connected to the A+ and A- of the DC charging pile, respectively, to supply power to the control board 3 and activate the controller 31. The communication connection terminals CC1, CC2, S+, and S- are connected to the CC1, CC2, S+, and S- of the DC charging pile, respectively, to perform interactive communication with the DC charging pile.

[0053] After the charging adapter is connected, the controller 31 installed on the control board 3 starts working after obtaining the 12V low-voltage power output from the A+ and A- terminals of the DC charging pile from the LDO power module 38. The controller 31 provides the DC charging pile with a CC1 signal and a CC2 signal with a voltage of 7.8-8.0V. In this embodiment, the CC1 signal uses a 1K resistor and the CC2 signal uses a 7.8-8.0V voltage. The DC charging pile starts to establish communication after receiving the above signals. At this time, the CAN communication module 36 installed on the control board 3 communicates with the DC charging pile according to the national standard charging communication protocol, performs a handshake before charging, and sends charging parameter configuration information to the DC charging pile. The charging parameter configuration information includes the current battery voltage of the vehicle's power battery, the maximum allowable temperature, the maximum allowable total charging voltage, the maximum allowable charging current, the rated capacity of the power battery system, and the battery type, etc. At the same time, the high-voltage power supply module 33 converts the 12V voltage into a 258V high-voltage power signal and outputs it to the DC input terminals DC+ and DC-, which are then supplied to the DC charging pile. When the DC charging pile detects that the high-voltage power signal transmitted by the DC input terminals DC+ and DC- is consistent with the CAN interaction information transmitted by the charging confirmation terminals S+ and S-, charging is allowed. The charging adapter exchanges information with the DC charging pile during the charging stage, including charging mode, voltage requirements, current requirements, etc., and enters the constant voltage and current limiting mode, outputting a constant voltage DC current. The charging voltage is 350V and the charging current is no more than 26A.

[0054] After the DC charging pile is ready or while it is exchanging information, the communication connection terminal CC in the AC connection terminal 2 of the charging adapter sends a CC signal to the on-board charger. The CC signal uses a 4.3K resistor. When the on-board charger recognizes this CC signal, it indicates that the adapter has been successfully connected. Then, the charging confirmation terminal CP sends a 6V level CP signal with a duty cycle between 90% and 100% to the on-board charger. In this embodiment, a 92% duty cycle is used. After the on-board charger recognizes this CP signal, the on-board charger... The machine sends a request signal to the vehicle's high-voltage relay to engage in preparation for charging, and enters the DC constant voltage current limiting mode to charge the power battery. Specifically, after receiving DC power, the on-board charger adjusts the voltage to charge the power battery according to the BMS requirements. When the power battery is fully charged, charging ends, and the CP signal is pulled high to 9V. When the controller 31 of the charging converter receives the signal from the charging confirmation terminal CP, it outputs a stop charging message to the DC charging pile through the CAN communication module 36. The DC charging pile stops the constant voltage DC current output, thus completing the charging of the PHEV model.

[0055] In addition to stopping charging when the power battery is fully charged, users can also manually stop charging. The controller 31 receives a stop-charging message from the DC charging pile via the CAN communication module 36. The controller 31 continuously sends a 12V high-level CP signal to the on-board charger. Upon receiving this signal, the on-board charger stops charging and requests the high-voltage relay to disconnect, thus stopping charging the power battery. The vehicle's charging adapter enhances communication with the DC charging pile and the on-board charger, and sends a high-voltage power signal to the DC charging pile via the control board 3. This satisfies the DC charging pile's requirements for voltage detection and comparison of the high-voltage battery, enabling PHEV models to charge via DC charging piles. Furthermore, the design of the control board 3 allows for timely interaction with the DC charging pile and the on-board charger, improving charging safety.

[0056] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A vehicle charging adapter, comprising a DC connection terminal (1) for connection to a DC charging pile and an AC connection terminal (2) for connection to an on-board charger, wherein the DC connection terminal (1) includes a first communication connection terminal (11), a DC input terminal DC+, and a DC input terminal DC-, and the AC connection terminal (2) includes a second communication connection terminal (21), an AC output terminal L1 connected to the DC input terminal DC+, and a neutral terminal N connected to the DC input terminal DC-, characterized in that, The charging adapter also includes a control board (3), which is connected to the DC input terminal DC+ and DC input terminal DC- respectively, for transmitting a simulated high-voltage signal to the DC charging pile. The simulated high-voltage signal is a 258V voltage signal. The control board (3) is also connected to the first communication connection terminal (11), for exchanging information with the DC charging pile to enable the DC charging pile to start or stop charging. The DC charging pile detects the DC input terminal DC+ and DC input terminal DC-. When the high-voltage power signal transmitted is consistent with the charging parameter configuration information transmitted by the first communication connection terminal (11), charging begins. The charging parameter configuration information includes the current battery voltage, maximum allowable temperature, maximum allowable total charging voltage, maximum allowable charging current, rated capacity of the power battery system, and battery type of the vehicle power battery. The second communication connection terminal (21) includes a charging confirmation terminal CP for exchanging charging information with the on-board charger. The control board (3) sends a CP signal with a duty cycle between 90% and 100% to the on-board charger through the charging confirmation terminal CP, so that the on-board charger enters the DC constant voltage current limiting mode. The control board (3) is also connected to the second communication connection terminal (21) for exchanging information with the on-board charger, so that the on-board charger starts charging the power battery or stops charging.

2. The vehicle charging adapter according to claim 1, characterized in that, The first communication connection terminal (11) includes communication connection terminals CC1 and CC2 for establishing a communication connection with the DC charging pile, and charging confirmation terminals S+ and S- for exchanging charging information with the DC charging pile. The communication connection terminals CC1, CC2, S+ and S- are all connected to the control board (3).

3. The vehicle charging adapter according to claim 2, characterized in that, The second communication connection terminal (21) includes a communication connection terminal CC for establishing a communication connection with the on-board charger and a charging confirmation terminal CP for exchanging charging information with the on-board charger. Both the communication connection terminal CC and the charging confirmation terminal CP are connected to the control board (3).

4. The vehicle charging adapter according to claim 3, characterized in that, The control board (3) is equipped with a controller (31), a high-voltage drive module (32), a high-voltage power supply module (33) for converting low-voltage power to high-voltage power, and a first I / O module (34), a second I / O module (35), a CAN communication module (36), and a digital isolation module (37) connected to the controller (31). The digital isolation module (37) is connected to the high-voltage power supply module (33) through the high-voltage drive module (32). The communication connection terminal CC and the charging confirmation terminal CP are both connected to the first I / O module (34). The communication connection terminal CC1 and the communication connection terminal CC2 are both connected to the second I / O module (35). The charging confirmation terminal S+ and the charging confirmation terminal S- are both connected to the CAN communication module (36).

5. The vehicle charging adapter according to claim 4, characterized in that, The control board (3) is also equipped with a unidirectional diode D, which is connected between the high-voltage power supply module (33) and the DC input terminal DC+. The positive terminal of the unidirectional diode D is connected to the high-voltage power supply module (33), and the negative terminal of the unidirectional diode D is connected to the DC input terminal DC+.

6. The vehicle charging adapter according to claim 4 or 5, characterized in that, The control board (3) is also equipped with an LDO power module (38) connected to the controller (31). The DC connection terminal (1) also includes a low-voltage auxiliary power supply A+ and a low-voltage auxiliary power supply A-, both of which are connected to the LDO power module (38). The LDO power module (38) is also connected to the CAN communication module (36).

7. A charging method based on a charging adapter, characterized in that, Includes the following steps: Step A: Connect the AC connection terminal (2) of the charging adapter to the on-board charger and proceed to step C; Connect the DC connection terminal (1) of the charging adapter to the DC charging gun of the DC charging pile and proceed to step B; Step B: After the control board (3) of the charging adapter obtains the auxiliary low-voltage power supply of the DC charging pile, it starts to work and interacts with the DC charging pile through the first communication connection terminal (11). At the same time, it transmits the analog high-voltage signal to the DC charging pile through the DC input terminal DC+ and the DC input terminal DC-. The DC charging pile detects the DC input terminal DC+ and the DC input terminal DC-. When the high-voltage power signal transmitted is consistent with the charging parameter configuration information transmitted by the first communication connection terminal (11), charging begins, and the constant voltage current limiting mode is entered, and a constant voltage DC current is output. The charging voltage is 350V, and the charging current is no more than 26A. The charging parameter configuration information includes the current battery voltage of the vehicle power battery, the maximum allowable temperature, the maximum allowable total charging voltage, the maximum allowable charging current, the rated capacity of the power battery system, and the battery type. Step C: The control board (3) sends a CP signal with a duty cycle between 90% and 100% to the on-board charger through the charging confirmation terminal CP in the second communication connection terminal (21). After the on-board charger recognizes the CP signal, it enters the DC constant voltage current limiting mode, and the vehicle high voltage relay is energized, so that the on-board charger enters the charging state. Step D: After charging is completed, when the control board (3) recognizes the raised CP signal through the second communication connection terminal (21), it sends a charging termination signal to the DC charging pile through the first communication connection terminal (11) to end the charging process.

8. The charging method based on a charging adapter according to claim 7, characterized in that, The operation of exchanging information with the DC charging pile through the first communication connection terminal (11) includes: The control board (3) sends CC1 signal and CC2 signal to the DC charging pile through the communication connection terminal CC1 and communication connection terminal CC2 in the first communication connection terminal (11). When the DC charging pile receives the CC1 signal and CC2 signal, it starts to establish communication. The control board (3) sends charging parameter configuration information to the DC charging pile through the charging confirmation terminal S+ and charging confirmation terminal S- in the first communication connection terminal (11). When the DC charging pile enters the constant voltage and current limiting mode, it performs information interaction with the DC charging pile during the charging stage. When charging is complete, the control board (3) sends a charging termination signal to the DC charging pile through the charging confirmation terminal S+ and the charging confirmation terminal S-.

9. The charging method based on a charging adapter according to claim 7, characterized in that, The operation of the control board (3) to interact with the on-board charger through the second communication connection terminal (21) includes: The control board (3) sends a CC signal to the on-board charger through the CC communication connection terminal in the second communication connection terminal (21). When the on-board charger recognizes the CC signal, the charging adapter is successfully connected to the on-board charger. When charging is complete, the on-board charger pulls the CP signal high to 9V, and the control board (3) identifies the CP signal that has been pulled high to 9V through the charging confirmation terminal CP.

10. The charging method based on a charging adapter according to claim 7, characterized in that... The charging method also includes the following steps: When charging is stopped by active operation, the control board (3) will receive the message of stopping charging sent by the DC charging pile through the charging confirmation terminal S+ and the charging confirmation terminal S-. The control board (3) will continuously send a 12V high-level CP signal to the on-board charger through the charging confirmation terminal CP. The on-board charger will stop charging and disconnect the high-voltage relay of the whole vehicle.

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