Vehicle discharge system, vehicle, vehicle discharge control method, device and medium

Abstract

The application relates to the technical field of vehicles, and particularly provides a vehicle-mounted discharging system, a vehicle, a vehicle discharging control method, equipment and a medium, aiming to solve the problem of how to start or switch a load under the premise that a bidirectional vehicle-mounted charger does not stop working and prolong the service life of a switching device. The system provided by the application comprises a controller and multiple discharging branches. A first end of the discharging branch is connected with an alternating-current port of the bidirectional vehicle-mounted charger, and a second end forms a discharging port. A switching device in the discharging branch is used for conducting or disconnecting the electrical connection between the first end and the second end. The controller is configured to, in response to first state switching of the discharging branch, control the switching device to disconnect the electrical connection when the alternating-current current in the discharging branch is less than a target value; and in response to second state switching of the discharging branch, control the switching device to gradually conduct the electrical connection. Based on the system, no impact current is generated when the load is started or switched, the charger does not need to stop working, and the service life of the switching device can be prolonged.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to an on-board discharge system, a vehicle, a vehicle discharge control method, equipment, and medium. Background Technology

[0002] Currently, electric vehicles (at least those that use batteries as their power source) are usually equipped with a bidirectional on-board charger (OBC). This bidirectional on-board charger can not only charge the electric vehicle's battery using an external power source, but also allow the electric vehicle to function as a mobile power supply device to power loads inside and outside the vehicle.

[0003] A bidirectional on-board charger can connect to multiple loads. Relays are installed between the bidirectional on-board charger and each load. By controlling the closing and opening of these relays, a power supply circuit can be established between the bidirectional on-board charger and different loads. Load startup may generate inrush current, and the relay contacts cannot withstand inrush current for extended periods. Frequent load startup will shorten the relay's lifespan. To avoid damage to the relays from inrush current, the bidirectional on-board charger must be stopped before starting the load. Then, the relay in the circuit containing the load to be started must be closed, and the bidirectional on-board charger must be started using a soft start method. Only after these operations are completed can the load be started. Because the bidirectional on-board charger needs to be stopped and restarted, some time is wasted, thus reducing the load power supply response speed. Furthermore, if other loads are being powered through the bidirectional on-board charger before it is stopped, those loads will also be forced to shut down due to the charger's shutdown.

[0004] Accordingly, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] In order to overcome the above-mentioned defects, this application is made to solve or at least partially solve the following technical problem: how to start or switch the load without shutting down the bidirectional on-board charger, and to extend the service life of the switching devices in the power supply circuit formed between the bidirectional on-board charger and the load.

[0006] In a first aspect, an on-board discharge system is provided, including a controller and a plurality of discharge branches, wherein a first end of the discharge branch is connected to an AC port of a bidirectional on-board charger, and a second end forms a discharge port of the discharge branch, the discharge port being used to connect a load;

[0007] The discharge branch includes a switching device connected in series between the first end and the second end, the switching device being used to connect or disconnect the electrical connection between the first end and the second end;

[0008] The controller is configured to:

[0009] In response to a first state switch of the discharge branch, the alternating current in the discharge branch is detected, and when the alternating current is less than a target value, the switching device is controlled to disconnect the electrical connection, and the first state switch is from a discharge state to a power-off state.

[0010] In response to a second state switch of the discharge branch, the switching device is controlled to gradually turn on the electrical connection, and the second state switch is from a power-off state to a discharge state.

[0011] In one technical solution of the above-mentioned vehicle-mounted discharge system, the step of controlling the switching device to disconnect the electrical connection when the alternating current is less than the target value includes:

[0012] When the alternating current is zero, the switching device is controlled to disconnect the electrical connection.

[0013] In one technical solution of the above-mentioned vehicle-mounted discharge system, the switching device is a switching transistor, and controlling the switching device to gradually turn on the electrical connection includes:

[0014] The duty cycle of the control switch is gradually increased from 0% to 100%.

[0015] In one technical solution of the above-mentioned vehicle-mounted discharge system, both the first end and the second end include a live wire terminal and a neutral wire terminal;

[0016] The switching device is a single device, which is connected in series between the live wire terminals of the first end and the second end;

[0017] Alternatively, there may be two switching devices, one of which is connected in series between the live wire terminals of the first and second ends, and the other of which is connected in series between the neutral wire terminals of the first and second ends.

[0018] In one technical solution of the above-mentioned vehicle-mounted discharge system, the discharge branch further includes:

[0019] A current sensor is connected in series between the switching device and the second terminal, and the current sensor is used to detect the alternating current in the discharge branch.

[0020] In one technical solution of the above-mentioned vehicle-mounted discharge system, the second end includes a live wire terminal and a neutral wire terminal;

[0021] The current sensor is a single unit, and the current sensor is connected in series between the switching device and the live wire terminal;

[0022] Alternatively, there may be two current sensors, one connected in series between the switching device and the live wire terminal, and the other connected in series between the switching device and the neutral wire terminal; and the controller may also be configured to disconnect the electrical connection when both current sensors detect that the AC current is zero.

[0023] In one technical solution of the above-mentioned vehicle-mounted discharge system, the discharge branch further includes an isolation sampling circuit, which is connected to the current sensor and the controller respectively;

[0024] The controller is also configured to acquire the AC current detected by the current sensor through the isolation sampling circuit.

[0025] In one technical solution of the above-mentioned vehicle-mounted discharge system, the discharge branch further includes an isolation drive circuit, which is connected to the switching device and the controller respectively;

[0026] The controller is also configured to control the switching device to disconnect or gradually connect the electrical connection via the isolation drive circuit.

[0027] In one technical solution of the above-mentioned vehicle-mounted discharge system, the controller is further configured to:

[0028] If an abnormal current is detected in the discharge branch, the control switching device is used to disconnect the electrical connection;

[0029] The abnormal current includes at least leakage current, overcurrent, and short circuit.

[0030] In one technical solution of the above-mentioned vehicle-mounted discharge system, the switching transistor is a MOSFET.

[0031] In a second aspect, a vehicle is provided, the vehicle including a bidirectional on-board charger and an on-board discharge system as described in any of the technical solutions provided in the first aspect above.

[0032] In a third aspect, a vehicle discharge control method is provided, the method comprising:

[0033] In response to a first state switch of the discharge branch in the vehicle, the alternating current in the discharge branch is detected, and when the alternating current is less than a target value, the switching device in the discharge branch is controlled to disconnect the electrical connection. The electrical connection is the electrical connection between a first end and a second end of the discharge branch. The first end is connected to the AC port of the bidirectional on-board charger in the vehicle, and the second end forms the discharge port of the discharge branch. The discharge port is used to connect a load. The switching device is connected in series between the first end and the second end. The first state switch is a switch from a discharge state to a power-off state.

[0034] In response to a second state switch of the discharge branch, the switching device is controlled to gradually turn on the electrical connection, and the second state switch is from a power-off state to a discharge state.

[0035] In one technical solution of the above-mentioned vehicle discharge control method, the step of controlling the switching device in the discharge branch to disconnect the electrical connection when the alternating current is less than the target value includes:

[0036] When the alternating current is zero, the switching device is controlled to disconnect the electrical connection.

[0037] In one technical solution of the above-mentioned vehicle discharge control method, the switching device is a switching transistor, and controlling the switching device to gradually conduct the electrical connection includes:

[0038] The duty cycle of the control switch is gradually increased from 0% to 100%.

[0039] Solution 1. An on-board discharge system, characterized in that the system includes a controller and multiple discharge branches, a first end of the discharge branch is connected to the AC port of a bidirectional on-board charger, and a second end forms the discharge port of the discharge branch, the discharge port being used to connect a load;

[0040] The discharge branch includes a switching device connected in series between the first end and the second end, the switching device being used to connect or disconnect the electrical connection between the first end and the second end;

[0041] The controller is configured to:

[0042] In response to a first state switch of the discharge branch, the alternating current in the discharge branch is detected, and when the alternating current is less than a target value, the switching device is controlled to disconnect the electrical connection, and the first state switch is from a discharge state to a power-off state.

[0043] In response to a second state switch of the discharge branch, the switching device is controlled to gradually turn on the electrical connection, and the second state switch is from a power-off state to a discharge state.

[0044] Solution 2. The system according to Solution 1, characterized in that, controlling the switching device to disconnect the electrical connection when the alternating current is less than the target value includes:

[0045] When the alternating current is zero, the switching device is controlled to disconnect the electrical connection.

[0046] Solution 3. The system according to Solution 1, characterized in that the switching device is a switching transistor, and the step of controlling the switching device to gradually connect the electrical connection includes:

[0047] The duty cycle of the control switch is gradually increased from 0% to 100%.

[0048] Solution 4. The system according to Solution 1, characterized in that both the first end and the second end include a live wire terminal and a neutral wire terminal;

[0049] The switching device is a single device, which is connected in series between the live wire terminals of the first end and the second end;

[0050] Alternatively, there may be two switching devices, one of which is connected in series between the live wire terminals of the first and second ends, and the other of which is connected in series between the neutral wire terminals of the first and second ends.

[0051] Solution 5. The system according to Solution 1, characterized in that the discharge branch further includes:

[0052] A current sensor is connected in series between the switching device and the second terminal, and the current sensor is used to detect the alternating current in the discharge branch.

[0053] Solution 6. The system according to Solution 1, characterized in that the discharge branch further includes a current sensor, and the second end includes a live wire terminal and a neutral wire terminal;

[0054] The current sensor is a single unit, and the current sensor is connected in series between the switching device and the live wire terminal;

[0055] Alternatively, there may be two current sensors, one connected in series between the switching device and the live wire terminal, and the other connected in series between the switching device and the neutral wire terminal; and the controller may also be configured to disconnect the electrical connection when both current sensors detect that the AC current is zero.

[0056] Solution 7. The system according to Solution 5, characterized in that the discharge branch further includes an isolation sampling circuit, the isolation sampling circuit being connected to the current sensor and the controller respectively;

[0057] The controller is also configured to acquire the AC current detected by the current sensor through the isolation sampling circuit.

[0058] Solution 8. The system according to Solution 1, characterized in that the discharge branch further includes an isolation drive circuit, the isolation drive circuit being connected to the switching device and the controller respectively;

[0059] The controller is also configured to control the switching device to disconnect or gradually connect the electrical connection via the isolation drive circuit.

[0060] Solution 9. The system according to Solution 1, wherein the controller is further configured to: if an abnormal current is detected in the discharge branch, control the switching device to disconnect the electrical connection; wherein the abnormal current includes at least leakage current, overcurrent and short circuit.

[0061] Option 10. The system according to Option 3, wherein the switching transistor is a MOS transistor.

[0062] Option 11. A vehicle, characterized in that the vehicle includes a bidirectional on-board charger and an on-board discharge system as described in any one of Options 1 to 10.

[0063] Option 12. A vehicle discharge control method, characterized in that the method includes:

[0064] In response to a first state switch of the discharge branch in the vehicle, the alternating current in the discharge branch is detected, and when the alternating current is less than a target value, the switching device in the discharge branch is controlled to disconnect the electrical connection. The electrical connection is the electrical connection between a first end and a second end of the discharge branch. The first end is connected to the AC port of the bidirectional on-board charger in the vehicle, and the second end forms the discharge port of the discharge branch. The discharge port is used to connect a load. The switching device is connected in series between the first end and the second end. The first state switch is a switch from a discharge state to a power-off state.

[0065] In response to a second state switch of the discharge branch, the switching device is controlled to gradually turn on the electrical connection, and the second state switch is from a power-off state to a discharge state.

[0066] Solution 13. The method according to Solution 12, characterized in that, controlling the switching device in the discharge branch to disconnect the electrical connection when the alternating current is less than the target value includes:

[0067] When the alternating current is zero, the switching device is controlled to disconnect the electrical connection.

[0068] Solution 14. The method according to Solution 12, characterized in that the switching device is a switching transistor, and the step of controlling the switching device to gradually connect the electrical connection includes:

[0069] The duty cycle of the control switch is gradually increased from 0% to 100%.

[0070] Solution 15. An electronic device, characterized in that it comprises:

[0071] At least one processor;

[0072] And, a memory communicatively connected to the at least one processor;

[0073] The memory stores a computer program, which, when executed by the at least one processor, implements the vehicle discharge control method according to any one of schemes 12 to 14.

[0074] Scheme 16. A computer-readable storage medium storing a plurality of program codes, characterized in that the program codes are adapted to be loaded and run by a processor to perform the vehicle discharge control method described in any one of Schemes 12 to 14.

[0075] The above-described technical solutions of this application have at least one or more of the following features. Beneficial effects:

[0076] In one embodiment of the on-board discharge system provided in this application, the system may include a controller and multiple discharge branches. A first end of each discharge branch is connected to the AC port of a bidirectional on-board charger, and a second end forms the discharge port of the discharge branch, which is used to connect a load. Each discharge branch includes a switching device connected in series between the first and second ends, used to connect or disconnect the electrical connection between the first and second ends. The controller is configured to perform the following operations: in response to a first state switch of the discharge branch, it detects the AC current in the discharge branch and controls the switching device to disconnect the electrical connection when the AC current is less than a target value, thus switching the first state from a discharge state to a de-energized state; in response to a second state switch of the discharge branch, it controls the switching device to gradually connect the electrical connection, thus switching the second state from a de-energized state to a discharge state.

[0077] In the above implementation scheme, the target value is a relatively small current value, for example, a current value close to zero. Furthermore, if the electrical connection is disconnected when the AC current is at the target value without shutting down the bidirectional on-board charger, the charge at the discharge port will be within a safe range and will not pose a danger to humans or other equipment. Disconnecting the electrical connection when the AC current is less than the target value effectively disconnects the load when the load current is relatively small (e.g., close to zero). Since the load current is relatively small, there is no possibility of inrush current. When power needs to be supplied to the load, the electrical connection is gradually reconnected, allowing the load voltage to gradually increase from zero to the target voltage (i.e., the actual output voltage of the bidirectional on-board charger). No voltage surge occurs, and without a voltage surge, the load current also does not surge, thus again preventing inrush current. As can be seen, based on the above implementation scheme, neither powering the load (or starting the discharge branch) nor disconnecting the load (or stopping the discharge branch) will generate inrush current. Therefore, it is unnecessary to stop the bidirectional on-board charger during load startup or load switching to avoid the hazards caused by inrush current. Simultaneously, since the bidirectional on-board charger does not shut down, it can respond quickly and supply power to the load promptly upon startup. The discharge branches do not affect each other, and each discharge branch can be started and stopped arbitrarily; this can be understood as a hot-switching of the discharge branch or load. Furthermore, since the bidirectional on-board charger does not need to be stopped, starting the load will not affect the normal power supply to other loads. Other loads will not be forced to shut down due to the bidirectional on-board charger stopping, thus avoiding the loss of load data / status due to power outages. Attached Figure Description

[0078] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Wherein:

[0079] Figure 1 This is a schematic diagram of an on-board discharge system according to an embodiment of this application. Figure 1 ;

[0080] Figure 2 This is a schematic diagram of an on-board discharge system according to an embodiment of this application. Figure 2 ;

[0081] Figure 3 This is a schematic diagram of an on-board discharge system according to an embodiment of this application. Figure 3 ;

[0082] Figure 4 This is a schematic diagram of an electronic device according to an embodiment of this application;

[0083] Figure label:

[0084] 11: Memory; 12: Processor. Detailed Implementation

[0085] Some embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0086] The relevant user personal information that may be involved in the various embodiments of this application is processed in strict accordance with the requirements of laws and regulations, following the principles of legality, legitimacy, and necessity, based on the reasonable purpose of the business scenario, and includes personal information that users actively provide or that is generated as a result of using the product / service, as well as personal information obtained with user authorization.

[0087] The personal information processed in this application will vary depending on the specific product / service scenario and will be based on the specific scenario in which the user uses the product / service. This may involve the user's account information, device information, driving information, vehicle information, or other related information. This application will treat the user's personal information and its processing with the utmost diligence.

[0088] This application attaches great importance to the security of users' personal information and has taken reasonable and feasible security protection measures that comply with industry standards to protect users' information and prevent unauthorized access, disclosure, use, modification, damage or loss of personal information.

[0089] The following describes an embodiment of the vehicle-mounted discharge system provided in this application.

[0090] See appendix Figure 1 , Figure 1 The main structure of the vehicle-mounted discharge system in some embodiments of this application is illustrated by way of example. Figure 1 As shown, in this embodiment, the vehicle-mounted discharge system may include a controller and multiple discharge branches ( Figure 1 The discharge branches 1 to n are shown.

[0091] The connection structure of each discharge branch in the system is basically the same. The following explanation uses one discharge branch as an example. Specifically, the first end of the discharge branch is connected to the AC port of the vehicle's bidirectional on-board charger (OBC), and the second end of the discharge branch forms the discharge port, which can be connected to a load. For example... Figure 1 As shown, the discharge ports of discharge branches 1 to n can be connected to loads 1 to n respectively.

[0092] The discharge branch may include a switching device connected in series between the first and second terminals. This switching device is used to connect or disconnect the electrical connection between the first and second terminals. When the electrical connection is connected, the AC power output from the AC port of the bidirectional on-board charger can be transmitted to the load through the discharge branch to power the load; when the electrical connection is disconnected, the AC power output from the AC port of the bidirectional on-board charger will not be transmitted to the load through the discharge branch, and the load will be de-energized. The switching device may be, but is not limited to, a switching transistor, a triode, or a switching chip integrating a switching transistor (such as a switching chip integrating a MOSFET). In some preferred embodiments, a switching transistor is used as the switching device. Furthermore, in some embodiments, the switching transistor can be a MOS (Metal Oxide Semiconductor Field-Effect Transistor), but other types of fully controlled power electronic devices can also be used, such as unidirectional thyristors (SCR), bidirectional thyristors (TRIAC), gate turn-off thyristors (GTO), electrostatic induction transistors (SIT), integrated gate commutated thyristors (IGCT), etc. This application does not specifically limit its use in this regard. The controller can be an MCU (Microcontroller Unit), and this application also does not specifically limit its use in this regard.

[0093] The discharge branch has two states: a discharge state and a power-off state. The discharge state is used to transmit AC power output from the bidirectional on-board charger to the discharge port to supply power to the load connected to the discharge port; the power-off state is used to stop transmitting AC power output from the bidirectional on-board charger to the discharge port to stop supplying power to the load connected to the discharge port. In this embodiment, the controller can be configured to perform the following operations to switch the state of the discharge branch:

[0094] (1) In response to the first state switching of the discharge branch, the AC current in the discharge branch is detected, and when the AC current is less than the target value, the switching device is controlled to disconnect the power connection, and the first state switch is changed from the discharge state to the power-off state. It should be noted that the positive and negative signs of AC current indicate the direction of AC current, not the magnitude of AC current. In this embodiment, the AC current being less than the target value means that the current value of AC current is less than the target value, which is unrelated to the direction of AC current.

[0095] The target value is a relatively small current value, for example, a current value close to zero. Furthermore, if the electrical connection between the first and second terminals of the discharge branch is disconnected when the AC current is the target value, and the current charge at the discharge port is within a safe range without posing a danger to humans or other equipment, and the bidirectional on-board charger remains running, the target value can be determined by first obtaining the maximum AC current that will not pose a danger to humans or other equipment when the aforementioned electrical connection is disconnected, provided the bidirectional on-board charger is running. The target value can then be determined based on this maximum AC current, and the target value must be less than or equal to this maximum AC current.

[0096] Based on the above operations, the load can be disconnected when the AC current is relatively small (e.g., close to zero). Because the current is small, there will be no inrush current, which will not damage the switching devices. In addition, the charge on the discharge port of the discharge branch will also be relatively small after the power is cut off, which can ensure the electrical safety of the system and prevent users or other equipment from accidentally touching the discharge port and causing safety accidents.

[0097] In some implementations, the switching device can be controlled to disconnect the electrical connection between the first and second terminals of the discharge branch when the AC current is zero, achieving zero-current power disconnection of the load, avoiding the generation of inrush current, and further improving the safety of the discharge port after power disconnection. The AC current alternates between the positive and negative half-cycles over time, and the current is zero when entering the negative half-cycle from the positive half-cycle or vice versa. Furthermore, in this embodiment, the AC output from the bidirectional on-board charger's AC port is single-phase AC, and conventional zero-crossing detection technology can be used to detect whether the current of this single-phase AC is zero.

[0098] (2) In response to the second state switching of the discharge branch, the control switching device is gradually turned on and connected, and the second state is switched from the power-off state to the discharge state.

[0099] Before the second state switch, the discharge branch is de-energized, and the output voltage of the discharge port is 0. If the control switching device gradually turns on the electrical connection, the output voltage of the discharge port will gradually increase from 0 to the target voltage. The target voltage is the voltage output by the AC port of the bidirectional on-board charger, that is, the actual power supply voltage output by the bidirectional on-board charger.

[0100] Based on the above operation, the voltage received by the load voltage gradually increases from 0 to the target voltage without any voltage abrupt change (such as the voltage jumping from 0 to the target voltage instantaneously). Since the voltage does not change abruptly, the load current will not change abruptly, and no inrush current will be generated.

[0101] In some embodiments, the switching device is a switching transistor, and the electrical connection between the first and second terminals in the discharge branch can be gradually connected by controlling the switching device to gradually increase the duty cycle of the switching transistor from 0% to 100%. When the duty cycle is 0%, the output voltage of the discharge port is 0, and when the duty cycle is 100%, the output voltage of the discharge port reaches the aforementioned target voltage. In some embodiments, a fixed duty cycle interval k (e.g., k = 10%) can be preset, and the duty cycle is gradually increased from 0% to 100% according to this duty cycle interval k. Those skilled in the art can flexibly set the value of the duty cycle interval k, and this embodiment does not specifically limit it.

[0102] As described above, it can be determined that the discharge branch based on the above structure will not generate inrush current whether it is supplying power to the load (or starting the discharge branch) or disconnecting power to the load (or stopping the discharge branch). Therefore, it is not necessary to stop the bidirectional on-board charger when starting or switching the load, thus avoiding the hazards caused by inrush current. Simultaneously, since the bidirectional on-board charger does not stop, it can respond quickly and supply power to the load promptly when starting it. Furthermore, the discharge branches do not affect each other, and each discharge branch can be started and stopped arbitrarily, which can be understood as a hot-switching of the discharge branch or the load. In addition, since the bidirectional on-board charger does not need to be stopped, starting the load will not affect the normal power supply to other loads. Other loads will not be forced to lose power due to the bidirectional on-board charger stopping, thus avoiding the loss of load data / status due to power outages.

[0103] The embodiments of the vehicle-mounted discharge system provided in this application will be described below.

[0104] In some embodiments of this application, the discharge branch further includes a current sensor connected in series in the discharge branch. The current sensor can be used to detect the AC current in the discharge branch. The controller can sample the detection result of the current sensor and then determine whether the AC current is zero based on the sampling result. When the AC current is zero, the load is powered off (i.e., the switching device in the discharge branch is controlled to disconnect the electrical connection between the first and second terminals in the discharge branch). When the load is connected to the discharge port of the discharge branch, a power supply loop is formed between the bidirectional on-board charger, the discharge branch, and the load. The AC current at different locations in the same loop is basically the same and can all represent the current (or load current) at the discharge port. Therefore, the current sensor can be connected in series at any location in the discharge branch, and the power-off control of the load can be determined based on the detection result of the current sensor. In some embodiments, in order to ensure the reliability of the load power-off and accurately detect the load current, the current sensor can be connected in series between the switching device and the second terminal (i.e., the discharge port) in the discharge branch, i.e., close to the discharge port. In this way, the detection result of the current sensor can more accurately represent the current (or load current) at the discharge port. Figure 2 As shown, the vehicle discharge system includes discharge branches 1 and 2. Taking discharge branch 1 as an example, a current sensor is connected in series between one end of the switching device and the discharge port (i.e., the second end of the discharge branch). The other end of the switching device forms the first end of the discharge branch, which is connected to the AC port of the bidirectional vehicle charger.

[0105] In some implementations, the discharge branch also includes an isolation sampling circuit connected to both the current sensor and the controller. The controller can also be configured to acquire the AC current detected by the current sensor via the isolation sampling circuit, thereby determining whether the AC current is zero. The isolation sampling circuit not only samples the detection result from the current sensor but also provides electrical isolation between the current sensor and the controller. The voltage level of the AC power output from the AC port of the bidirectional on-board charger (e.g., 220V) may be much higher than the voltage level of the controller (e.g., a voltage range of 1 to 5V). This means the voltage level of the discharge branch will also be much higher than the voltage level of the controller. Electrical isolation between the current sensor and the controller protects the controller.

[0106] In some embodiments, the discharge branch further includes an isolation drive circuit, which is connected to both the switching device and the controller. The controller can also be configured to control the switching device to disconnect or gradually connect the electrical connection between the first and second terminals in the discharge branch via the isolation drive circuit. Under the control of the controller, the isolation drive circuit can output a drive signal to the switching device, which can then be turned on or off. Furthermore, the isolation drive circuit can also be used to electrically isolate the switching device from the controller; the purpose of this electrical isolation is the same as that in the aforementioned isolation sampling circuit, and will not be repeated here.

[0107] The embodiments of the vehicle-mounted discharge system provided in this application will be described below.

[0108] In some embodiments of this application, both the first and second ends of the discharge branch include a live wire terminal and a neutral wire terminal, and the AC port of the bidirectional on-board charger also includes a live wire terminal and a neutral wire terminal. The live wire and neutral wire terminals of the first end of the discharge branch are respectively connected to the live wire and neutral wire terminals of the AC port. When the second end of the discharge branch (i.e., the discharge port) is connected to a load, the live wire and neutral wire terminals of the load are respectively connected to the live wire and neutral wire terminals of the second end.

[0109] In the field of alternating current technology, if a current loop is formed between a human body and the live wire through the ground, it will seriously threaten human life. However, because the potential difference between the neutral wire and the ground is relatively small, even if a current loop is formed between a human body and the neutral wire through the ground, it will not seriously threaten human life. In some embodiments, the switching device in the discharge branch can be a single device, which can be connected in series between the live wire terminals at the first and second ends. When the load is powered off, the switching device can be controlled to disconnect the electrical connection between the live wire terminals at the first and second ends, i.e., disconnect the live wire. Thus, even if a human body comes into contact with the discharge port, a current loop will not be formed with the live wire, ensuring power-off safety.

[0110] In some embodiments, to further ensure load power-off safety, two switching devices can be installed in the discharge branch. One switching device is connected in series between the live wire terminal of the first end and the live wire terminal of the second end, and the other switching device is connected in series between the neutral wire terminal of the first end and the neutral wire terminal of the second end. When the controller switches the state of the discharge branch, it performs the same control on both switching devices simultaneously, causing both switching devices to turn on or off at the same time. When controlling the power-off of the load, both the live wire and the neutral wire can be disconnected simultaneously. This way, even if a person touches the discharge port, no current loop will be formed with either the live wire or the neutral wire, avoiding potential dangers that may arise from the live wire and neutral wire.

[0111] In some embodiments, the current sensor in the discharge branch can be a single sensor connected in series between the switching device and the live wire terminal of the second end (i.e., the discharge port). The detection result of this current sensor can more accurately represent the current transmitted to the discharge port via the live wire. As described in the foregoing embodiments, in order to ensure the safety of the load during power outage, the live wire must be disconnected. Since the detection result of this current sensor can accurately represent the current transmitted via the live wire, the load power outage can be achieved more reliably based on this detection result, thus ensuring the safety of power outage.

[0112] In some embodiments, two current sensors can be installed in the discharge branch. One current sensor is connected in series between the switching device and the live wire terminal of the second terminal (i.e., the discharge port). The detection result of this current sensor can more accurately represent the current transmitted to the discharge port via the live wire. The other current sensor is connected in series between the switching device and the neutral wire terminal of the second terminal (i.e., the discharge port). The detection result of this current sensor can more accurately represent the current transmitted to the neutral wire via the discharge port. If both current sensors detect that the AC current is less than the target value, it indicates that the current (or load current) at the discharge port must be less than the target value. In this case, power-off control of the load can further improve the reliability of power-off and ensure power-off safety. Based on this, in this embodiment, when the controller switches the state of the discharge branch, the switching device disconnects the electrical connection between the first and second terminals in the discharge branch when both current sensors detect that the AC current is less than the target value.

[0113] like Figure 3 As shown, the vehicle-mounted discharge system includes discharge branches 1 and 2. Taking discharge branch 1 as an example, discharge branch 1 includes switching transistors 1 and 2, and current sensors 1 and 2. Current sensor 1 is connected in series between switching transistor 1 and the live wire terminal of the second end (i.e., the discharge port). Figure 3 Between L), the current sensor 2 is connected in series between the switch transistor 2 and the neutral terminal of the second end (i.e., the discharge port). Figure 3 Between N) in the discharge branch. When switching the discharge branch to the first state, the controller will control the switches 1 and 2 to turn off simultaneously when both current sensors 1 and 2 detect zero AC current, thereby disconnecting the electrical connection between the first and second terminals in discharge branch 1. When switching the discharge branch to the second state, the controller will simultaneously control the duty cycle of switches 1 and 2 to gradually increase from 0% to 100%, thereby connecting the electrical connection between the first and second terminals in discharge branch 1.

[0114] The embodiments of the vehicle-mounted discharge system provided in this application will be described below.

[0115] In some embodiments of this application, the controller may also be configured to detect whether an abnormal current occurs in the discharge branch. If an abnormal current occurs, the controller will control the switching device to disconnect the electrical connection between the first and second terminals in the discharge branch. Based on this, the load can be promptly de-energized when an abnormal current occurs, protecting the vehicle-mounted discharge system and the load. The abnormal current includes at least leakage, overcurrent, and short circuit conditions. In this embodiment, conventional leakage, overcurrent, and short circuit detection methods can be used for detection, and this embodiment does not impose specific limitations on these methods. Furthermore, the bidirectional vehicle-mounted charger can also perform insulation detection on the AC port. If an insulation fault is detected, the AC output can be stopped to protect the vehicle-mounted discharge system and the load.

[0116] Another aspect of this application provides a vehicle.

[0117] In one embodiment of a vehicle according to this application, the vehicle may include a bidirectional on-board charger and the on-board discharge system described in the above system embodiments. The vehicle may be a vehicle that uses at least a power battery as a power source, and the vehicle may be a pure electric vehicle, a hybrid vehicle, etc.

[0118] Another aspect of this application provides a vehicle discharge control method, which can be applied to the vehicle discharge system described in the foregoing system embodiments.

[0119] In an embodiment of a vehicle discharge control method according to this application, the method may include the following steps S101 to S102.

[0120] Step S101: In response to the first state switching of the discharge branch in the vehicle, detect the AC current in the discharge branch, and control the switching device in the discharge branch to disconnect the electrical connection when the AC current is less than the target value.

[0121] The above electrical connection is the electrical connection between the first end and the second end in the discharge branch. The first end is connected to the AC port of the bidirectional on-board charger in the vehicle, and the second end forms the discharge port of the discharge branch. The discharge port is used to connect the load. The switching device is connected in series between the first end and the second end. The first state is switched from the discharge state to the power-off state.

[0122] In some implementations, when the control switching device disconnects the electrical connection, the control switching device can disconnect the electrical connection when the alternating current is zero.

[0123] Step S102: In response to the second state switching of the discharge branch, the control switching device is gradually turned on the above electrical connection, and the second state switch is from the power-off state to the discharge state.

[0124] In some implementations, when the switching device is a switching transistor, the duty cycle of the switching transistor can be controlled to gradually increase from 0% to 100% in order to gradually turn on the above-mentioned electrical connection.

[0125] The discharge branch, target value, bidirectional on-board charger, and switching devices are the same as those in the aforementioned system embodiment, and will not be repeated here. The load can be on-board equipment or other electrical equipment. For example, it can be a mobile phone, laptop computer, or other electrical equipment.

[0126] Based on the methods described in steps S101 to S102 above, in the case of multiple discharge branches in the vehicle, power can be cut off and power can be supplied to the load connected to any discharge port (i.e., the discharge port of any discharge branch), and the loads connected to each discharge port will not affect each other. When switching the load connected to the discharge port, it is not necessary to shut down the bidirectional on-board charger. It is only necessary to switch the first and second states of the corresponding discharge branch in sequence. This will not affect the normal power supply of other discharge branches to other loads, and other loads will not be forced to shut down due to the shutdown of the bidirectional on-board charger. This also avoids the loss of load data / state due to power failure.

[0127] Another aspect of this application provides a computer-readable storage medium.

[0128] In one embodiment of a computer-readable storage medium according to this application, the computer-readable storage medium can be configured to store a program that performs the vehicle discharge control method of the above-described method embodiments. This program can be loaded and run by a processor to implement the above-described vehicle discharge control method. For ease of explanation, only the parts related to the embodiments of this application are shown; for specific technical details not disclosed, please refer to the method section of the embodiments of this application. The computer-readable storage medium can be a storage device comprising various electronic devices. Optionally, in the embodiments of this application, the computer-readable storage medium is a non-transitory computer-readable storage medium.

[0129] Another aspect of this application provides an electronic device.

[0130] In one embodiment of an electronic device according to this application, the electronic device may include at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program that, when executed by the at least one processor, implements the methods described in any of the above embodiments. See Appendix Figure 4 , Figure 4 The image exemplarily illustrates a communication connection between memory 11 and processor 12 via a bus. In embodiments of this application, the electronic device may be an in-vehicle controller such as a vehicle infotainment system.

[0131] The technical solution of this application has been described above with reference to one embodiment shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A vehicle-mounted discharge system, characterized in that, The system is designed to allow the bidirectional on-board charger to be powered on without stopping during load startup or load switching. The system includes a controller and multiple discharge branches. The first end of each discharge branch is connected to the AC port of the bidirectional on-board charger, and the second end forms the discharge port of the discharge branch, which is used to connect to the load. The discharge branch includes a switching device connected in series between the first end and the second end, the switching device being used to connect or disconnect the electrical connection between the first end and the second end; The controller is configured to: In response to a first state switch of the discharge branch, the alternating current in the discharge branch is detected, and when the alternating current is zero, the switching device is controlled to disconnect the electrical connection, wherein the first state switch is a switch from a discharge state to a power-off state. In response to a second state switch of the discharge branch, the switching device is controlled to gradually turn on the electrical connection, and the second state switch is from a power-off state to a discharge state. Wherein, the switching device is a switching transistor, and the control of the switching device to gradually turn on the electrical connection includes: controlling the duty cycle of the switching transistor to gradually increase from 0% to 100%.

2. The system according to claim 1, characterized in that, Both the first end and the second end include a live wire terminal and a neutral wire terminal; The switching device is a single device, which is connected in series between the live wire terminals of the first end and the second end; Alternatively, there may be two switching devices, one of which is connected in series between the live wire terminals of the first and second ends, and the other of which is connected in series between the neutral wire terminals of the first and second ends.

3. The system according to claim 1, characterized in that, The discharge branch also includes: A current sensor is connected in series between the switching device and the second terminal, and the current sensor is used to detect the alternating current in the discharge branch.

4. The system according to claim 1, characterized in that, The discharge branch also includes a current sensor, and the second end of each branch includes a live wire terminal and a neutral wire terminal. The current sensor is a single unit, and the current sensor is connected in series between the switching device and the live wire terminal; Alternatively, there may be two current sensors, one connected in series between the switching device and the live wire terminal, and the other connected in series between the switching device and the neutral wire terminal; and the controller may also be configured to disconnect the electrical connection when both current sensors detect that the AC current is zero.

5. The system according to claim 4, characterized in that, The discharge branch also includes an isolation sampling circuit, which is connected to the current sensor and the controller respectively. The controller is also configured to acquire the AC current detected by the current sensor through the isolation sampling circuit.

6. The system according to claim 1, characterized in that, The discharge branch also includes an isolation drive circuit, which is connected to the switching device and the controller respectively. The controller is also configured to control the switching device to disconnect or gradually connect the electrical connection via the isolation drive circuit.

7. The system according to claim 1, characterized in that, The controller is also configured to: If an abnormal current is detected in the discharge branch, the control switching device is used to disconnect the electrical connection; The abnormal current includes at least leakage current, overcurrent, and short circuit.

8. The system according to claim 1, characterized in that, The switching transistor is a MOSFET.

9. A vehicle, characterized in that, The vehicle includes a bidirectional on-board charger and an on-board discharge system as described in any one of claims 1 to 8.

10. A vehicle discharge control method, characterized in that, The method is used to enable bidirectional on-board chargers to operate without shutting down during load startup or load switching. The method includes: In response to a first state switch of the discharge branch in the vehicle, the alternating current in the discharge branch is detected, and when the alternating current is zero, the switching device in the discharge branch is controlled to disconnect the electrical connection. The electrical connection is the electrical connection between a first end and a second end of the discharge branch. The first end is connected to the AC port of the bidirectional on-board charger in the vehicle, and the second end forms the discharge port of the discharge branch. The discharge port is used to connect a load. The switching device is connected in series between the first end and the second end. The first state switch is a switch from a discharge state to a power-off state. In response to a second state switch of the discharge branch, the switching device is controlled to gradually turn on the electrical connection, and the second state switch is from a power-off state to a discharge state. Wherein, the switching device is a switching transistor, and the control of the switching device to gradually turn on the electrical connection includes: controlling the duty cycle of the switching transistor to gradually increase from 0% to 100%.

11. An electronic device, characterized in that, include: At least one processor; And, a memory communicatively connected to the at least one processor; The memory stores a computer program, which, when executed by the at least one processor, implements the vehicle discharge control method of claim 10.

12. A computer-readable storage medium storing a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by a processor to perform the vehicle discharge control method of claim 10.

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