Vehicle-mounted charger and vehicle charging system

Abstract

The invention provides a vehicle-mounted charger and a vehicle charging system, and relates to the technical field of vehicles. A protocol conversion unit and a power management control unit are arranged in the vehicle-mounted charger, the protocol conversion unit is connected with the power management control unit, the power management control unit and the protocol conversion unit are both connected with a charging port of a vehicle, and the charging port is used for being connected with a charging pile. The power management control unit is used for outputting a power supply signal to the protocol conversion unit; the protocol conversion unit is used for obtaining a message initiated by the charging pile according to a first communication protocol after obtaining the power supply signal and completing power-on, and forwarding the message to the power management control unit according to a second communication protocol. According to the scheme, the electric vehicle can be adaptively matched with the charging piles with different charging standards through the vehicle-mounted charger, and the charging cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicles, and in particular relates to a vehicle charger and a vehicle charging system. Background Art

[0002] With the development of new energy technology, electric vehicles have been widely used in various regions around the world. However, the charging standards in different regions are different, which makes electric vehicles in different regions incompatible with each other.

[0003] At present, in order to enable electric vehicles to be charged in different regions, charging piles adapted for the electric vehicles are usually installed in the region, and the electric vehicles are charged using the charging piles.

[0004] However, the current method of installing additional charging equipment is costly. Summary of the invention

[0005] The embodiments of the present invention provide a vehicle charger and a vehicle charging system, which can solve the problem that electric vehicles cannot adapt to charging piles with different charging standards.

[0006] In a first aspect, an embodiment of the present invention provides an on-board charger, wherein a protocol conversion unit and a power management control unit are provided in the on-board charger, wherein the protocol conversion unit is connected to the power management control unit, wherein the power management control unit and the protocol conversion unit are both connected to a charging port of a vehicle, and the charging port is used to connect to a charging pile;

[0007] The power management control unit is used to output a power supply signal to the protocol conversion unit;

[0008] The protocol conversion unit is used to obtain the message initiated by the charging pile according to the first communication protocol after obtaining the power supply signal and completing the power-on, and forward the message to the power management control unit according to the second communication protocol, and the message is used to request the power management control unit to control the charging pile to charge the battery in the vehicle.

[0009] In a second aspect, an embodiment of the present invention provides a vehicle charging system, comprising: a charging pile, a charging port and the above-mentioned on-board charger, wherein the charging port is used to connect the charging pile and the on-board charger, and the charging pile is used to charge the vehicle through the charging port and the on-board charger.

[0010] The on-board charger and vehicle charging system provided by the embodiments of the present invention, by configuring a protocol conversion unit in the on-board charger, can realize adaptive matching of electric vehicles to charging piles with different charging standards in different regions when users use charging piles to charge electric vehicles. Users do not need to additionally install charging piles with charging standards compatible with electric vehicles, thereby reducing charging costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following is a brief introduction to the drawings required for use in the embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 A schematic diagram of the structure of the vehicle charger provided in the embodiment of the present application;

[0013] Figure 2 A schematic diagram of the circuit structure of a vehicle charging system provided in an embodiment of the present application;

[0014] Figure 3 A schematic diagram of the communication process between various units during the charging process provided in an embodiment of the present application;

[0015] Figure 4 A schematic diagram of the charging process for different charging standards provided in an embodiment of the present application. DETAILED DESCRIPTION

[0016] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention, rather than to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0017] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0018] The trade of electric vehicles between different regions is increasing day by day. Different regions have different charging standards, and each standard is different. Electric vehicles produced in region A can usually only use the charging standard of region A. Once the electric vehicle is exported to region B, the electric vehicle may not be able to use the charging standard of region B after arriving in region B, resulting in the electric vehicle being unable to be used in region B. At present, users in region B need to install additional charging piles adapted to the electric vehicle, or the electric vehicle manufacturer in region A needs to install additional charging standard conversion parts on the electric vehicle, which increases the charging cost. Moreover, if the electric vehicle manufacturer installs additional charging standard conversion parts on the electric vehicle, it is also necessary to ensure that the charging standard conversion parts can adapt to the parts standard of region B and meet the charging requirements of region B, which increases the development cost. Moreover, the additional charging standard conversion parts installed on the electric vehicle will also occupy additional vehicle space, causing other vehicle parts to squeeze each other.

[0019] In response to the above problems, this application provides an on-board charger and vehicle charging system, which makes the charging standard conversion parts of the Electric Vehicle Communication Controller (EVCC) into a separate module and places it inside the on-board charger (OBC). No additional space needs to be reserved. For electric vehicles that need to be exported, this module can be installed in the OBC. In addition, OBC-related experiments can cover the newly added module, and the separate EVCC housing is eliminated, effectively reducing costs.

[0020] The technical solution of the present application is described in detail below through specific embodiments. It should be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0021] Figure 1 A schematic diagram of the structure of the vehicle charger provided in the embodiment of the present application is shown in FIG. Figure 1 As shown, the on-board charger 10 may be provided with a protocol conversion unit 11 and a power management and protection system (Power Management and Protection System, PMS) control unit (may be referred to as a power management control unit or a PMS control unit for short).

[0022] The protocol conversion unit 11 is connected to the power management control unit 12 (specifically, connected through a first wire and a first signal line), and the power management control unit 12 and the protocol conversion unit 11 are both connected to the charging port 13 of the electric vehicle through a second signal line. In addition, in some embodiments, in order to ensure charging safety, the management control unit 12 and the protocol conversion unit 11 are both connected to the charging port 13 through a protective grounding wire.

[0023] In this embodiment, the charging port 13 can be used to connect the charging gun of the charging pile. Because the communication protocols used by charging piles are different in different regions, it is easy for electric vehicles in different regions to be unable to be charged by charging piles. In this embodiment, the protocol conversion unit is used to realize the communication between the charging pile and the power management control unit. The protocol conversion unit is used to realize data transmission (for example, transmission of charging parameters) between the charging pile and the power management control unit.

[0024] Exemplarily, taking the production of electric vehicles in region A as an example, the corresponding charging standard is A1 (for example, charging standard A1 indicates that the electric vehicle needs to use the first communication protocol to communicate with the charging pile in region A). The charging standard in region B corresponds to B1 (for example, charging standard B1 indicates that the charging pile in region B needs to use the second communication protocol to communicate with the electric vehicle). If the electric vehicle continues to use charging standard A1 in region B after being produced in region A, it cannot be adapted to the charging pile in region B. For this reason, it is necessary to set the above-mentioned protocol conversion unit 11 in the on-board charger of the electric vehicle. In addition, if the electric vehicle is only charged in region A, it is not necessary to set the above-mentioned protocol conversion unit 11 on the on-board charger to reduce costs.

[0025] Among them, after the user inserts the charging gun in the charging pile into the charging port, the power management control unit 12 will be triggered to output a power supply signal to the protocol conversion unit 11 through the first conductive line. The protocol conversion unit 11 will be awakened and powered on after receiving the power supply signal.

[0026] After the protocol conversion unit 11 is powered on, it will serve as an intermediate conversion unit to realize the communication between the power management control unit and the charging pile. For example, the protocol conversion unit 11 can obtain the message initiated by the charging pile in area B according to the first communication protocol, and forward the message to the power management control unit 12 according to the second communication protocol. The message is used to request the power management control unit to control the charging pile to charge the battery in the vehicle.

[0027] In the embodiment of the present application, the protocol conversion unit is arranged inside the OBC, which can save a shell, avoid the current problem of adding a separate EVCC part, and achieve the purpose of saving vehicle space and cost. In addition, as a platform product, OBC has good versatility and can realize the adaptive matching of electric vehicles to charging piles with different charging standards in different regions, improve the applicability of electric vehicles in different charging scenarios, and do not require human intervention, which is easy to implement. And because the protocol conversion unit is arranged inside the OBC, it is easier to adapt to the parts standards of different regions, avoiding the problem of redeveloping a single EVCC product according to the parts standards of different regions, and reducing the difficulty of development.

[0028] Among them, it has been mentioned above that the power management control unit 12 needs to output a power supply signal to the protocol conversion unit 11 so that the protocol conversion unit 11 can be powered on and started. In practical applications, electric vehicles may be charged using charging piles in area A or charging piles in area B. For example, if the electric vehicle is compatible with the charging standard of area A, then when the electric vehicle is charged using the charging piles in area A, it is not necessary to use the protocol conversion unit 11 for message forwarding.

[0029] Among them, when the electric vehicle is charged using the charging pile in area B, if the electric vehicle is not compatible with the charging standard of area B, the PMS control unit needs to output a power supply signal to the protocol conversion unit.

[0030] Among them, the charging pile communicates with the PMS control unit through the second signal line between the charging port and the PMS control unit. A protective earthing (PE) line is set between the charging port and the PMS control unit. The PE signal is transmitted through the PE protective earthing line. When an electrical fault or leakage occurs, the PE line can guide the current to the ground, thereby protecting the safety of personnel and equipment. In addition, the control pilot (CP) signal can be transmitted between the PMS control unit and the charging port through the second signal line, and the communication between the electric vehicle and the charging pile is realized through the CP signal.

[0031] When the electric vehicle is charging, the charging pile will generate a CP signal as a wake-up signal. This CP signal is sent to the electric vehicle through the communication line between the charging port and the electric vehicle (such as the second signal line mentioned above). Among them, the status of the charging pile can be determined by measuring the voltage difference between the CP signal and PE. For example, a 12-volt voltage difference means that the charging pile is in an idle state (ie, not connected), a 9-volt voltage difference means that the charging pile is connected, and a 6-volt voltage difference means that it is charging.

[0032] Among them, when the user inserts the charging gun into the charging port, the charging pile will output a 9-volt CP signal as a wake-up signal to inform the PMS control unit that the current charging gun has been inserted into the charging port. In this embodiment, when charging piles with different charging standards send CP signals to the PMS control unit, the PMS control unit can identify the charging standard that the charging pile is compatible with. For example, the PMS control unit can identify the charging standard that the charging pile is compatible with based on the configuration word carried in the CP signal. Specifically, a configuration word can be preset in the PMS control unit. When the configuration word carried in the CP signal matches the preset configuration word, it means that the charging standard of the charging pile is not compatible with the electric vehicle. At this time, it is necessary to output a power supply signal to the protocol conversion unit, start the protocol conversion unit, and perform communication protocol conversion. If the configuration word carried in the CP signal does not match the preset configuration word, it means that the charging standard of the charging pile is compatible with the electric vehicle. At this time, it is not necessary to start the protocol conversion unit.

[0033] In an embodiment of the present application, by presetting the configuration word in the PMS control unit, it can be detected whether the current charging standard is compatible with the electric vehicle. If it is not compatible, the protocol conversion unit needs to be started. If the current charging standard is compatible with the electric vehicle, the protocol conversion unit does not need to be started. This can avoid the protocol conversion unit being in a working state for a long time and reduce power consumption.

[0034] Furthermore, in some embodiments, taking the scenario where the current charging standard is not compatible with electric vehicles as an example, when the charging gun is inserted into the charging port and the protocol conversion unit is powered on, the charging pile needs to communicate directly with the protocol conversion unit through the first communication protocol to initiate a vehicle-side connection establishment request. The protocol conversion unit needs to send a charging handshake message corresponding to the vehicle-side connection establishment request to the PMS control unit in accordance with the communication method of the second communication protocol.

[0035] Among them, since the PMS control unit in the OBC usually needs to use other communication protocols (such as the third communication protocol) to communicate with the battery management system (BMS), if the protocol conversion unit needs to communicate with the BMS, the communication loop can also be reused. However, since the communication loop uses other communication protocols (such as the third communication protocol), at this time, if the protocol conversion unit forwards the communication signal (such as a handshake message) to the PMS, the PMS control unit also needs to perform a communication protocol conversion, that is, send the handshake message to the BMS in the communication mode of the third communication protocol, and the BMS determines whether the electric vehicle is allowed to use the charging pile for charging.

[0036] Among them, the BMS can return a handshake reply message to the PMS control unit according to the third communication protocol, and the PMS control unit forwards it to the protocol conversion unit through the second communication protocol to inform whether the charging pile is allowed to charge.

[0037] Exemplarily, the third communication protocol may be Controller Area Network (CAN) communication.

[0038] In an embodiment of the present application, when the charging standard of the charging pile is not compatible with the electric vehicle, the protocol conversion unit can directly reuse the communication circuits of the OBC and BMS when communicating with the BMS, without the need to add a separate communication circuit, thereby reducing communication costs.

[0039] Further, in some embodiments, after completing the handshake, if the BMS allows the charging pile to charge, the protocol conversion unit can continue to receive the electronic lock closing request sent by the charging pile according to the first communication protocol, and send the electronic lock closing request to the PMS control unit according to the second communication protocol.

[0040] The electronic lock closing request is used to request the PMS control unit to control the electronic lock to close. When the electronic lock is closed, it means that the charging gun is correctly inserted into the charging port. At this time, the charging gun can be locked to facilitate the subsequent charging pile to charge the electric vehicle through the charging gun and prevent the charging gun from being detached during the charging process.

[0041] In an embodiment of the present application, the electronic lock closing request of the charging pile is forwarded to the PMS control unit through the protocol conversion unit. When the charging standard of the charging pile is not suitable for the electric vehicle, communication between the charging pile and the PMS control unit can still be achieved. At the same time, the electronic lock closing request can be used to confirm the closure of the electronic lock to prevent the charging gun from detaching from the charging port during subsequent charging, thereby improving charging safety.

[0042] Further, in some embodiments, when the charging pile communicates with the PMS control unit through the protocol conversion unit and the electronic lock is closed, the protocol conversion unit needs to send an authentication message to the charging pile according to the first communication protocol.

[0043] The authentication message can be used for identity authentication, charging fee payment authentication, and charging authorization authentication. If the charging pile fails to pass the authentication and returns the authentication result corresponding to the authentication message, the charging pile will not be able to charge the electric vehicle. At this time, the protocol conversion unit can notify the PMS control unit to control the electronic lock to open, and the charging gun will automatically fall off from the charging port.

[0044] If the protocol conversion unit receives an authentication result corresponding to an authentication message returned by the charging pile according to the first communication protocol, the protocol conversion unit may initiate a switch closing request to the power management control unit according to the second communication protocol.

[0045] The switch closing request is used to request the power management control unit to close the charging switch. The charging switch is a switch on the electric vehicle side. During the charging process of the electric vehicle, after confirming that the charging gun, the charging port and the electric vehicle are all connected, the charging pile will switch the first switch S1 from the 12V connection state to the PWM state and wait for the PMS control unit to close the charging switch S2. When the charging switch S2 is closed, it means that the electric vehicle is ready to charge.

[0046] Furthermore, when the charging switch is closed, the PMS control unit will use the first communication protocol to feed back a low-level CP signal to the charging pile (e.g., a 6-volt CP signal), informing the charging pile that charging can begin. In order to ensure safety during the charging process, the charging pile needs to perform insulation monitoring operations after receiving the low-level CP signal to eliminate leakage and other conditions.

[0047] In this embodiment, by sending an authentication message to the charging pile according to the first communication protocol through the protocol conversion unit, the charging pile can be authenticated and verified to avoid abnormal charging behavior of the charging pile that does not meet the authentication requirements, thereby improving the charging safety in the subsequent charging process.

[0048] Furthermore, the BMS can transmit the pre-charging request to the PMS control unit through the third communication protocol, and then the PMS control unit forwards the pre-charging request to the protocol conversion unit through the second communication protocol, and the protocol conversion unit then forwards the pre-charging request to the charging pile using the first communication protocol to inform the charging pile to perform the pre-charging operation.

[0049] Among them, the pre-charging operation mainly allows the charging pile to pre-charge the electric vehicle. Pre-charging means that before the electric vehicle is charged, the charging pile will first provide a certain voltage and current to the charging port of the electric vehicle for pre-charging. The purpose of this step is to reduce the sudden change of voltage and current during the formal charging process, thereby protecting the battery of the electric vehicle from damage and improving the charging efficiency.

[0050] In this embodiment, the pre-charging request is forwarded to the charging pile using the first communication protocol through the protocol conversion unit. When the charging standard of the charging pile is not suitable for the electric vehicle, communication between the BMS and the charging pile can still be achieved to inform the charging pile to perform pre-charging operations. On the basis of enabling the charging pile to charge the electric vehicle, pre-charging can further protect the battery and improve the charging efficiency.

[0051] Further, after the charging pile completes pre-charging, the PMS control unit will close the fast charging relay. Figure 2 The circuit structure schematic diagram of the vehicle charging system provided in the embodiment of the present application is as follows: Figure 2 As shown, the charging pile 21 is connected to the on-board charger 23 through the charging port 22 , and the on-board charger 23 is connected to the motor drive control unit 24 (Motor Drive Control Unit, MDCU) and the power battery 25 , and the power battery 25 includes a battery management system 251 .

[0052] During the battery charging process of electric vehicles, the MDCU can work with the battery management system to ensure the safety and efficiency of the charging process. Specifically, the MDCU can receive instructions from the BMS and adjust the operating state of the motor according to the current state of the battery (such as power, temperature, etc.), thereby indirectly affecting the charging process. Exemplarily, if the MDCU detects an abnormal situation (such as motor overheating, battery power is too low or too high, etc.), it can send a stop charging request to the BMS to protect the safety of the battery and motor. This stop charging request is usually implemented through the communication protocol within the vehicle to ensure coordination and consistency between the various systems.

[0053] Among them, the on-board charger 23 includes a PMS control unit 231 and a protocol conversion unit 232. The protocol conversion unit may specifically refer to a DC charging protocol conversion unit. The PMS control unit and the protocol conversion unit communicate with each other through a second communication protocol (for example, a serial peripheral interface (SPI)). In addition, the protocol conversion unit needs to rely on the PMS control unit to output a power supply signal to achieve power-on start. Among them, the serial peripheral interface can realize short-distance communication. SPI communication can also be used for data transmission between OBC and the BMS in the power battery.

[0054] In this embodiment, the protocol conversion unit can be used to achieve that after the vehicle is exported to other regions, it can still adapt to the charging standards of other regions, so that electric vehicles produced in region A (electric vehicles produced in region A are usually adapted to the charging standards of region A) can still adapt to the charging status of region B and use the charging piles in region B for charging.

[0055] In this embodiment, the PMS control unit is connected to a fast charging relay 26 and an AC / DC converter 27, and the fast charging relay and the AC / DC converter are connected to the charging pile through the AC / DC charging port, and the PMS control unit outputs a control signal to the fast charging relay and the AC / DC converter.

[0056] Furthermore, in some embodiments, the protocol conversion unit receives a power transmission request sent by the PMS control unit according to the second communication protocol, and then the protocol conversion unit needs to forward the power transmission request to the charging pile through the first communication protocol. The power transmission request is used to request the charging pile to charge the vehicle.

[0057] In this embodiment, after the charging pile receives the power transmission request, it will start charging the electric vehicle. During the charging process, the BMS can send a voltage and / or current adjustment request to the PMS control unit in real time according to the charging status (the BMS communicates with the PMS control unit through a third communication protocol). The PMS control unit then forwards the voltage or current adjustment request to the protocol conversion unit through the second communication protocol, and the protocol conversion unit then forwards the voltage or current adjustment request to the charging pile through the first communication protocol to control the output voltage and / or output current of the charging pile during the charging process.

[0058] In an embodiment of the present application, a voltage or current adjustment request is forwarded to a charging pile using a first communication protocol through a protocol conversion unit. When the charging standard of the charging pile is not suitable for the electric vehicle, communication between the BMS and the charging pile can still be achieved to inform the charging pile to adjust the voltage and / or current output during the charging process. This not only enables charging of electric vehicles by charging piles with different charging standards, but also realizes the control of electrical parameters during the charging process, thereby improving the charging effect.

[0059] Further, in some embodiments, when charging needs to be terminated, the protocol conversion unit may receive a charging stop request sent by the PMS control unit according to the second communication protocol, and send a charging stop request to the charging pile according to the first communication protocol. The charging stop request is used to request the charging pile to stop charging the vehicle.

[0060] In this embodiment, the MDCU will communicate with the BMS to inform the BMS that the vehicle needs to stop charging. The BMS will send a current reduction request to the PMS control unit through the third communication protocol, and then the PMS control unit will send a current reduction output request to the protocol conversion unit according to the second communication protocol, and the PMS control unit will forward the current reduction output request to the charging pile according to the first communication protocol.

[0061] After receiving the request to reduce the current output, the charging pile can reduce the charging current to less than 1A. Furthermore, the BMS sends a request to disconnect the charging relay to the PMS control unit through the third communication protocol. After receiving the request to disconnect the charging relay, the PMS control unit disconnects the fast charging relay. Finally, the charging pile stops charging the vehicle.

[0062] In this embodiment, in order to ensure the safety of the gun collection process and avoid situations such as electric shock to the user, after the charging pile stops charging the vehicle, the PMS control unit will turn on the charging switch mentioned above, which will trigger the PMS control unit to send a high-level CP signal (for example, a 9-volt CP signal) to the charging pile, informing the charging pile that it will subsequently perform the gun drawing action.

[0063] Furthermore, in order to ensure the safety of the gun collection process, the protocol conversion unit will send a charging stop request to the charging pile through the first communication protocol to inform the charging pile to stop the charging action again.

[0064] Furthermore, the PMS control unit will open the electronic lock mentioned above to facilitate subsequent users to draw their guns. At the same time, the PMS control unit will send a stop digital communication request to the protocol conversion unit through the second communication protocol, and the protocol conversion unit will forward the stop digital communication request to the charging pile through the first communication protocol to inform the charging pile that the communication has ended.

[0065] Furthermore, after the current charging is completed, the PMS control unit may no longer output a power supply signal to the protocol conversion unit, and the protocol conversion unit is powered off to reduce energy consumption.

[0066] In an embodiment of the present application, a charging stop request is forwarded to a charging pile using a first communication protocol through a protocol conversion unit. When the charging standard of the charging pile is not suitable for the electric vehicle, communication between the BMS and the charging pile can still be achieved to inform the charging pile to stop charging, thereby improving the safety of subsequent users in the process of drawing the gun and preventing leakage and the like.

[0067] Continue to refer to the above Figure 2 A PE line is set between the PMS control unit and the AC / DC charging port. When an electrical fault or leakage occurs, the PE line can guide the current to the ground, thereby protecting the safety of personnel and equipment. In addition, the CP signal mentioned above can be transmitted between the PMS control unit and the AC / DC charging port through a wire, and the communication between the electric vehicle and the charging pile is realized through the CP signal.

[0068] Furthermore, the AC / DC charging port can transmit a control pilot circuit (CC) signal to the PMS control unit. The CC signal is mainly used to detect whether the charging gun of the charging pile has been connected to the charging port of the electric vehicle. When the charging gun is inserted into the electric vehicle, the CC signal will jump from a high level to a low level (for example, from 9V to 6V). The charging pile determines whether the charging gun is correctly connected by detecting this change.

[0069] In addition, the AC and DC charging ports can transmit the fast charging socket temperature signal to the PMS control unit. Among them, the fast charging socket temperature signal is used to monitor the temperature of the fast charging socket. During the fast charging process, due to the large current, the fast charging socket may generate high heat. By monitoring the socket temperature in real time, the PMS control unit can ensure that the temperature remains within a safe range to avoid equipment damage or safety hazards caused by overheating. If the temperature is too high, the PMS control unit can take measures to reduce the charging power or stop charging to protect the circuit and user safety.

[0070] Furthermore, the AC and DC charging ports can transmit the slow charging socket temperature signal to the PMS control unit. Similar to the fast charging socket temperature signal, the slow charging socket temperature signal is used to monitor the temperature of the socket. Because although the current is relatively small during slow charging, long-term charging may still cause the temperature to rise. By monitoring this temperature, the PMS control unit can ensure the safety and stability of the slow charging process and adjust the charging strategy when necessary to prevent overheating.

[0071] Furthermore, the electronic lock can transmit an electronic lock signal to the PMS control unit. The electronic lock signal is used to indicate the lock status of the charging port. When the electronic lock is closed, it means that the charging port is locked, the charging gun is inserted into the charging port and charging can begin. After the PMS control unit receives the electronic lock signal, it can determine whether the charging operation can be performed based on the status of the signal and take corresponding control measures.

[0072] Refer to the above Figure 2 Taking the charging standards including European standard and national standard as an example, the DC charging protocol conversion unit supporting European standard is integrated into OBC as a separate module, and the protocol conversion unit can be used as an optional configuration. For example, when electric vehicles are exported from China to Europe and the United States, the protocol conversion unit is selected and installed in OBC. If the electric vehicles are only used in China, the protocol conversion unit does not need to be selected.

[0073] Among them, the OBC hardware circuit is compatible with the mainstream types of electronic locks in the market, and drives different types of electronics according to the configuration word. In addition, the OBC hardware is compatible with different types of temperature sensors, and the corresponding RT table is mobilized according to the configuration word software to detect and report different types of temperature sensors.

[0074] In this embodiment, when the electric vehicle uses a European standard charging pile for fast charging, the DC protocol conversion unit communicates with the BMS through OBC, and there is no need to build an additional fast charging CAN circuit between the protocol conversion unit and the BMS.

[0075] Figure 3 A schematic diagram of the communication process between various units during the charging process provided by the embodiment of the present application, such as Figure 3As shown, it specifically includes the following steps: step 31, plug the gun, the CP signal jumps to 9 volts; step 32, the CP signal wakes up the PMS; step 33, according to the configuration word, it is identified that the charging standard is not compatible and the CP signal duty cycle is 3% to 7%, and the protocol conversion unit is powered; step 34, power is supplied to the MDCU; step 35, request to establish a connection with the vehicle end (PLC communication); step 36, send a charging handshake message (SPI communication); step 37, send a charging handshake message (SPI communication); step 38, send a handshake message (CAN communication); step 39, send a handshake message (SPI communication); step 310, request to close the electronic lock (PLC communication); step 311, request to close the electronic lock (SPI communication); step 312, authentication (PLC communication); step 313, request to close the S2 switch (SPI communication). Wherein the S2 switch is the charging switch; step 314, after the S2 switch is closed, the CP signal jumps to 6 volts (PLC communication); step 315, insulation monitoring; step 316, request pre-charge (CAN communication); step 317, request pre-charge (SPI communication); step 318, request pre-charge (PLC communication); step 319, pre-charge; step 320, close the fast charge relay; step 321, close the fast charge relay; step 322, send a power transmission request; step 323, request power transmission (SPI communication); step 324, request power transmission (PLC communication); step 325, send a voltage or current adjustment request; step 326, send a voltage or current adjustment request (SPI communication); step 327, send a voltage or current adjustment request (PLC communication); step 328, the vehicle end stops charging; step 329, reduce the current request; Step 330, request the charging pile to reduce the current output (SPI communication); Step 331, request the charging pile to output a current less than 1 amp (PLC communication); Step 332, reduce the current output; Step 333, request to disconnect the fast charging relay; Step 334, disconnect the fast charging relay; Step 335, request the charging pile to stop output; Step 336, request the charging pile to stop output (SPI communication); Step 337, request the charging pile to stop output (PLC communication); Step 338, stop output and turn on the relay; Step 339, turn on the S2 switch; Step 340, the CP signal jumps to 9 volts; Step 341, open the electronic lock; Step 342, request the charging pile to stop current output (PLC communication); Step 343, request to stop digital communication (SPI communication); Step 344, request to stop digital communication (PLC communication); Step 345, the user draws the gun.

[0076] For example, taking the charging standards including the European standard and the national standard as an example, Figure 4 The charging process diagram of different charging standards provided in the embodiment of the present application is as follows: Figure 4As shown, it includes the following steps: Step S410: Determine whether the vehicle type is national standard charging. Step S420: National standard charging. Step S430: OBC does not select the protocol conversion unit. Step S440: Write the charging type configuration word in OBC as national standard charging. Among them, the national standard charging configuration word is used by OBC to determine whether it is necessary to power the protocol conversion unit when detecting that the charging gun is inserted. Step S450: After the configuration word is written, OBC adapts the internal software and hardware to the national standard. Step S460: The whole vehicle AC charging and DC charging are carried out in accordance with the national standard. Step S470: European standard charging. Step S480: OBC selects the protocol conversion unit. Step S490: Write the charging type configuration word in OBC as national standard charging. Step S4100: After the configuration word is written, OBC adapts the internal software and hardware to the European standard. Step S4110: Based on the optional protocol conversion unit, the whole vehicle AC charging and DC charging are carried out in accordance with the European standard. In this embodiment, OBC can be divided into two cases, with or without an optional protocol conversion unit, according to whether there is export demand for electric vehicles. When charging in accordance with the European standard, the protocol conversion unit needs to be installed, and when charging in accordance with the national standard, the protocol conversion unit is not installed. In addition, the DC protocol conversion unit can also be used as a standard accessory, so that one OBC hardware can be compatible with both national and European standard charging. Through the configuration word, adaptive matching of different charging standards of the national standard and the European standard can be achieved, so that electric vehicles can be charged under different charging standards.

[0077] An embodiment of the present application also provides a vehicle, which may be an electric vehicle, comprising the above-mentioned on-board charger.

[0078] It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention.

[0079] The functional blocks shown in the structural block diagram described above can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), appropriate firmware, plug-in, function card, etc. When implemented in software, the elements of the present invention are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or communication link by a data signal carried in a carrier. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, read-only memory (Read-Only Memory, ROM), flash memory, erasable read-only memory (Erasable ReadOnly Memory, EROM), floppy disks, compact disc read-only memory (Compact Disc Read-Only Memory, CD-ROM), optical discs, hard disks, optical fiber media, radio frequency (Radio Frequency, RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0080] It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in a different order from the embodiments, or several steps can be performed simultaneously.

[0081] Aspects of the present disclosure are described above with reference to the flowchart and / or block diagram of the method, device (system) and computer program product according to the embodiment of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0082] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. A vehicle charger, characterized in that: The on-board charger is provided with a protocol conversion unit and a power management control unit, the protocol conversion unit is connected to the power management control unit, the power management control unit and the protocol conversion unit are both connected to the charging port of the vehicle, and the charging port is used to connect to the charging pile; The power management control unit is used to output a power supply signal to the protocol conversion unit; The protocol conversion unit is used to obtain the message initiated by the charging pile according to the first communication protocol after obtaining the power supply signal and completing the power-on, and forward the message to the power management control unit according to the second communication protocol, and the message is used to request the power management control unit to control the charging pile to charge the battery in the vehicle.

2. The vehicle-mounted charger according to claim 1, characterized in that: The power management control unit is further used to obtain a wake-up signal sent by the charging pile, and output the power supply signal to the protocol conversion unit when it is detected that the configuration word carried in the wake-up signal matches the preset configuration word.

3. The vehicle-mounted charger according to claim 1, characterized in that: The protocol conversion unit is specifically used to obtain the electronic lock closing request sent by the charging pile according to the first communication protocol, and send the electronic lock closing request to the power management control unit according to the second communication protocol, and the electronic lock closing request is used to request the power management control unit to control the electronic lock to close.

4. The vehicle-mounted charger according to claim 1, characterized in that: The protocol conversion unit is specifically used to send an authentication message to the charging pile according to the first communication protocol, and after receiving the authentication result corresponding to the authentication message returned by the charging pile according to the first communication protocol, initiate a switch closing request to the power management control unit according to the second communication protocol, and the switch closing request is used to request the power management control unit to close the charging switch.

5. The vehicle-mounted charger according to claim 1, characterized in that: The protocol conversion unit is specifically used to obtain the pre-charging request sent by the power management control unit according to the second communication protocol, and send the pre-charging request to the charging pile according to the first communication protocol, wherein the pre-charging request is used to request the charging pile to pre-charge the vehicle.

6. The vehicle-mounted charger according to claim 1, characterized in that: The protocol conversion unit is specifically used to obtain the power transmission request sent by the power management control unit according to the second communication protocol, and send the power transmission request to the charging pile according to the first communication protocol, wherein the power transmission request is used to request the charging pile to charge the vehicle.

7. The vehicle-mounted charger according to claim 1, characterized in that: The protocol conversion unit is specifically used to obtain the vehicle-side connection establishment request sent by the charging pile according to the first communication protocol, and send a charging handshake message corresponding to the vehicle-side connection establishment request to the power management control unit according to the second communication protocol; The power management control unit is specifically configured to forward the charging handshake message to a battery management system according to the third communication protocol; The power management control unit is specifically used to obtain the handshake reply message returned by the battery management system according to the third communication protocol, and forward the handshake reply message to the protocol conversion unit according to the second communication protocol, and the handshake reply message is used to indicate whether the vehicle has established an electrical connection with the charging pile.

8. The vehicle-mounted charger according to claim 1, characterized in that: The protocol conversion unit is specifically used to obtain a charging stop request sent by the power management control unit according to the second communication protocol, and send the charging stop request to the charging pile according to the first communication protocol, wherein the charging stop request is used to request the charging pile to stop charging the vehicle.

9. The vehicle-mounted charger according to any one of claims 1 to 8, characterized in that: The first communication protocol is a power line communication protocol, and the second communication protocol is a serial peripheral interface communication protocol.

10. A vehicle charging system, characterized in that: include: A charging pile, a charging port and an on-board charger according to any one of claims 1 to 9, wherein the charging port is used to connect the charging pile and the on-board charger, and the charging pile is used to charge the vehicle through the charging port and the on-board charger.

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