In-vehicle alternating current socket discharging circuit and vehicle

Abstract

The utility model discloses an in-vehicle alternating current socket discharging circuit and an automobile. The circuit comprises a vehicle-mounted charger, an alternating current socket, an alternating current charging port and a socket state detector, an AC wire harness of the AC charging port is connected with the AC socket and the vehicle-mounted charger. A processor, and a low-voltage power supply circuit, a signal transceiver, a temperature sampling circuit, a current detection circuit and a switch state detection circuit which are connected with the microprocessor are arranged in the socket state detector; the microprocessor is used for preprocessing detection results of the temperature sampling circuit, the current detection circuit and the switch state detection circuit and then sending the detection results to the vehicle-mounted charger, so that the vehicle-mounted charger can control the power-on state of the alternating current socket according to the detection results of the temperature sampling circuit, the current detection circuit and the switch state detection circuit. According to the scheme, an independent controller does not need to be independently configured for the alternating current socket, mold opening of the shell is not needed, cost is low, and popularization is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to an in-car AC socket discharge circuit and a car. Background Art

[0002] Currently, there are two main ways for vehicle manufacturers to realize the in-vehicle discharge function of new energy vehicles. One is to add a controllable relay to the AC wiring harness. The circuit schematic diagram is as follows: Figure 1 As shown in the figure, this solution adjusts the power source of the car socket by controlling the on-off of the AC wiring harness in different scenarios; the second is to add an AC port to the on-board charger. The circuit schematic is shown in the figure. Figure 2 As shown, this solution connects the wiring harness to the vehicle's 220V power outlet, with the onboard charger directly responsible for powering the outlet and detecting faults. However, both approaches have drawbacks. Regarding the first approach, adding an AC wiring harness relay controller: ① This requires redeveloping a new controller, requiring a mold for the housing and designing the relay control board. This is time-consuming, labor-intensive, and expensive, significantly increasing the cost per vehicle. ② The control strategy is complex, requiring a significant software update for all high-voltage system controllers, resulting in low compatibility with the original vehicle solution and a significant workload. ③ The new controller requires relocation, requiring significant structural changes. Regarding the second approach, adding an onboard charger AC port: ① The housing requires a new mold and PCB redesign, which is also time-consuming and labor-intensive, increasing the cost per vehicle. ② For onboard chargers with more complex functions or a high degree of integration, hardware modifications are difficult, increasing the failure rate and malfunction rate. In summary, there is an urgent need for a cost-effective, easily adaptable, and scalable solution for implementing in-vehicle discharge functionality across all vehicle platforms. Utility Model Content

[0003] In view of this, an embodiment of the present invention provides an in-vehicle AC socket discharge circuit and a vehicle, so as to provide a low-cost and easy-to-promote in-vehicle discharge solution.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] An in-vehicle AC socket discharge circuit, comprising:

[0006] On-board charger, AC socket, AC charging port and socket status detector;

[0007] The AC wiring harness of the AC charging port is connected to the AC socket and the on-board charger respectively, and the AC wiring harness includes a power live wire harness, a power neutral wire harness and a power ground wire harness;

[0008] The socket status detector is equipped with a processor and a low-voltage power supply circuit connected to the microprocessor, a signal transceiver, a temperature sampling circuit, a current detection circuit and a switch status detection circuit;

[0009] The temperature sampling circuit is used to obtain the temperature signal of the AC socket;

[0010] The current detection circuit is used to obtain the output current of the AC socket;

[0011] The switch state detection circuit is used to obtain the switch signal of the small door of the AC socket;

[0012] The output end of the signal transceiver is connected to the on-board charger;

[0013] The microprocessor is used to pre-process the detection results of the temperature sampling circuit, the current detection circuit and the switch state detection circuit, and provide the processed detection results to the on-board charger.

[0014] Optionally, in the above-mentioned in-vehicle AC socket discharge circuit, the socket state detector is integrated inside the AC socket.

[0015] Optionally, in the above-mentioned in-vehicle AC socket discharge circuit, a fuse is configured in the AC wiring harness.

[0016] Optionally, the above-mentioned in-vehicle AC socket discharge circuit further includes:

[0017] The BCM circuit is used to detect the switch status of the charging port door. The output end of the BCM circuit is connected to the on-board charger and the BMS. The BMS is the on-board battery management system.

[0018] Optionally, in the above-mentioned in-vehicle AC socket discharge circuit, the output end of the BCM circuit is connected to the on-board charger and the BMS through a gateway.

[0019] Optionally, in the above-mentioned in-vehicle AC socket discharge circuit, the gateway is further connected to an external interactive device to realize data interaction between the BMS and the external interactive device.

[0020] Optionally, in the above-mentioned in-vehicle AC socket discharge circuit, the external interactive device includes a car display screen, an instrument or a vehicle network system.

[0021] Optionally, the above-mentioned in-vehicle AC socket discharge circuit further includes:

[0022] The on-board charger is provided with a comparison circuit, which is used to obtain the comparison result between the temperature sampling circuit and the current detection circuit.

[0023] A car, comprising:

[0024] The in-vehicle AC socket discharge circuit described in any one of the above.

[0025] Based on the above technical solution, the above solution provided by the embodiment of the present invention includes a vehicle-mounted charger, an AC socket, an AC charging port and a socket status detector; the AC wiring harness of the AC charging port is respectively connected to the AC socket and the vehicle-mounted charger, and the AC wiring harness includes a power live wire harness, a power neutral wire harness and a power ground wire harness; the socket status detector is configured with a processor and a low-voltage power supply circuit connected to the microprocessor, a signal transceiver, a temperature sampling circuit, a current detection circuit and a switch status detection circuit; the microprocessor is used to pre-process the detection results of the temperature sampling circuit, the current detection circuit and the switch status detection circuit, and provide the processed detection results to the vehicle-mounted charger, so that the vehicle-mounted charger can control the power-on state of the AC socket according to the detection results of the temperature sampling circuit, the current detection circuit and the switch status detection circuit. This solution does not require a separate controller to be configured for the AC socket, and there is no need to open a mold for the shell, which is low-cost and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0027] Figure 1 This is a circuit diagram for realizing the in-vehicle discharge function of a new energy vehicle disclosed in the prior art;

[0028] Figure 2 This is a circuit diagram for realizing the in-vehicle discharge function of a new energy vehicle disclosed in the prior art;

[0029] Figure 3 This is a schematic diagram of the structure of the in-vehicle AC socket discharge circuit disclosed in an embodiment of the present application;

[0030] Figure 4 This is a structural diagram of a socket status detector in a discharge circuit of an in-vehicle AC socket disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The AC wiring harness is an important component of the vehicle's power supply. It is mainly responsible for transmitting electrical energy from the vehicle's power supply to the vehicle's electrical appliances, while protecting the automotive appliances from adverse factors such as high voltage and current fluctuations. The AC wiring harness includes a live wire harness, a neutral wire harness, and a ground wire harness. In order to prevent the AC wiring harness from being burned out by excessive current, a fuse can be configured on the AC wiring harness.

[0033] In order to provide an easy-to-promote, easy-to-match and low-cost solution to implement the in-vehicle discharge strategy, the present application discloses an in-vehicle AC socket discharge circuit. By directly branching the AC wiring harness between the vehicle charging port and the on-board charger to the in-vehicle AC power socket, a current detection circuit, a temperature sampling circuit and a switch status detection circuit are installed on the in-vehicle socket, and the signal is transmitted to the on-board charger through a signal transmitter. The on-board charger adjusts its own charging and discharging mode and power based on the status of the small door of the vehicle charging port, the power mode of the vehicle, the current charging and discharging status of the vehicle, and faults. The in-vehicle AC socket discharge circuit has high compatibility with various platform models, is easy to promote, and greatly reduces the amount of changes to the software and hardware of the original vehicle controllers, which is convenient for real-time and low-cost.

[0034] See also Figure 3 The in-vehicle AC socket discharge circuit disclosed in this application may include: an on-board charger 1, an AC socket 2, an AC charging port 3 and a socket state detector 4.

[0035] The on-board charger 1 is a charger fixedly installed on an electric vehicle, which has the ability to safely and automatically fully charge the electric vehicle's power battery. The charger can dynamically adjust the charging current or voltage parameters based on the data provided by the battery management system (BMS), perform corresponding actions, and complete the charging process.

[0036] The AC outlet 2 connects the vehicle's power supply to the high-voltage wiring harness of the electrical appliances, primarily responsible for transmitting power from the vehicle's power supply to the electrical appliances while protecting them from adverse factors such as high voltage and current fluctuations. The AC outlet 2 is equipped with a small door and a matching microswitch. A switch state detection circuit detects the switch state of the microswitch, thereby enabling detection of the open or closed state of the door.

[0037] The specific type of the AC socket 2 can be selected according to user needs. In the technical solution disclosed in this embodiment, for example, the AC socket 2 can be an ACIS (AC Charging Socket) socket.

[0038] The AC charging port 3 is a charging interface for charging the vehicle. The AC charging port can be connected to an external power source via a charging gun. The other end of the AC charging port 2 is connected to the onboard charger 1 via an AC wiring harness, and the power received by the AC charging port 2 can be charged into the onboard charger. In the technical solution disclosed in this embodiment, the AC wiring harness includes a first wiring harness AC_L, a second wiring harness AC_N, and a third wiring harness AC_PE. Each wiring harness has three terminals, which are denoted as the first terminal, the second terminal, and the third terminal. The first terminal is connected to the AC charging port 3, the second terminal is connected to the onboard charger 1, and the third terminal is connected to the AC socket 2. The selection of the AC wiring harness needs to ensure the maximum power supply of the vehicle socket.

[0039] The socket status detector 4 is used to collect the working status of the AC socket 2 and send relevant signals to the on-board charger, so that the on-board charger 1 adjusts the power supply of the AC socket 2 according to the collected signals and its own status.

[0040] In this embodiment, see Figure 4 The socket state detector 4 is equipped with a microprocessor (MCU) 40 and a low-voltage power supply circuit 41 connected to the microprocessor 40, a signal transceiver 42, a temperature sampling circuit 43, a current detection circuit 44 and a switch state detection circuit 45;

[0041] The temperature sampling circuit 43 is used to monitor the resistance of the thermistor RT in the AC socket to obtain the temperature signal of the AC socket 2;

[0042] The current detection circuit 44 is used to obtain the output current of the AC socket 2;

[0043] The switch state detection circuit 45 is used to obtain the switch signal of the cover door of the AC socket 2 by detecting the open and closed state of the micro switch S in the AC socket 2, wherein the open and closed state of the micro switch S is related to the open and closed state of the cover door of the AC socket;

[0044] The processor 40 is used to pre-process the signals collected by the temperature sampling circuit 43, the current detection circuit 44 and the switch state detection circuit 45, and send the pre-processed signals to the on-board charger 1 through the signal transceiver 42. The pre-processing may include filtering, analog-to-digital conversion, etc.

[0045] The low-voltage power supply circuit 41 is used to provide operating voltage to the electrical components in the socket status detector 4 to ensure reliable operation of the socket status detector 4 .

[0046] In the above solution disclosed in this embodiment, the on-board charger 1 is further used to obtain the status signal of the AC socket 2 detected by the temperature sampling circuit 43, the current detection circuit 44 and the switch state detection circuit 45, and control the power-on state of the AC socket 2 based on the status signal. Here, when the on-board charger 1 controls the power-on state of the AC socket 2 based on the detection results of the temperature sampling circuit 43, the current detection circuit 44 and the switch state detection circuit 45, the control strategy configured in the on-board charger 1 can refer to the existing Figure 1 and Figure 2 The control strategy of the control board of the AC socket in the solution shown can also be implemented using a comparison circuit.

[0047] For example, the on-board charger 1 is configured with a first comparator and a second comparator. The first input of the first comparator is used to obtain the temperature sampling result processed by the processor, and the second input of the first comparator is used to obtain a reference value. When the temperature sampling result is greater than the reference value, the first comparator outputs a high-level signal. The first input of the second comparator is used to obtain the current detection result processed by the processor, and the second input of the second comparator is used to obtain a reference value. When the current detection result is greater than the reference value, the second comparator outputs a high-level signal. The on-board charger 1 can control the power supply of the AC outlet 2 based on the output of the first comparator, the output of the second comparator, and the detection result of the switch state detection circuit.

[0048] In the technical solution disclosed in this embodiment, the socket status detector 4 can be integrated within the AC socket. Specifically, it can be integrated into a detection circuit board 21 within the AC socket. The detection circuit board 21 is connected to the vehicle's low-voltage wiring harness via two power supply harnesses, KL_30 and KL_31. This low-voltage wiring harness is then connected to an external power supply, which provides operating voltage to the various electrical components within the detection circuit board 21. The detection circuit board 21 is also connected to a reserved CAN transceiver interface of the onboard charger via a local CAN bus. The output signal of the transceiver 42 can be transmitted to the onboard charger via this local CAN bus. In the technical solution disclosed in this embodiment, the detection circuit board 21 is solely responsible for detecting the AC socket's current, temperature, and the open / close status of the cover door. Insulation testing can be performed by the onboard charger, and leakage testing by the charging station. Alternatively, a redundant design can be implemented on the AC socket's detection circuit board 21.

[0049] In this proposal, see Figure 1 The AC charging port is equipped with a small door. The opening and closing of the door is detected by the BCM (Body Control Module) controller. The BCM can also connect to the BMS (Battery Management System) and the onboard charger via a gateway. The BMS is a controller that implements charging and discharging functions. The BCM transmits the detected door opening and closing status to the BMS and the onboard charger via the CAN line. The BMS and the onboard charger use the received door opening and closing status signal as a condition to control the current charging and discharging state. This ensures that the onboard charger does not enter or exit inverter mode when the door is open, keeping the AC charging port in a de-energized state whenever accessible. In this embodiment, the BCM can connect to external devices, the BMS, and the onboard charger via a gateway. The external display device may include an entertainment screen, an instrument and a TBOX. The entertainment screen, the instrument and the TBOX all exchange CAN signals with the charge and discharge controller BMS through the gateway. The user can exchange data with the charge and discharge function-related controller BMS through the entertainment screen, the instrument and the TBOX, and send AC socket power-on status control instructions, power-on status viewing instructions, etc. to the BMS through the entertainment screen, the instrument and the TBOX. When the user controls or views the power-on or power-off status of the AC socket in the car, the charge and discharge function-related controller BMS enters or exits the corresponding status process, and displays the current status and fault prompts of the AC socket through the display end controller.

[0050] In this embodiment, the user can turn on the AC socket in the car through the APP loaded on the entertainment screen or the car system. Depending on the scenario, the AC socket in the car can supply power to electrical appliances when driving, parking, not OFF and the charging port door is not open, AC charging, and discharging outside the car. The AC socket can also be equipped with a power status indicator light. The indicator light on the AC socket will light up when the AC socket has power, thereby reminding the user that the AC socket in the car is in a charged state and the user can use electrical appliances such as computers and kettles.

[0051] In the technical solution disclosed in this embodiment, the power status of the AC outlet can be jointly controlled by the on-board charger and the BMS. When the vehicle is parked and the in-vehicle outlet power supply mode is already enabled, if the vehicle power mode is turned off, the in-vehicle AC outlet switches from a charged state to a de-energized state. When the vehicle is parked and the in-vehicle outlet power supply mode is already enabled, if the user opens the charging port door, the in-vehicle AC outlet switches from a charged state to a de-energized state. When the user is charging the vehicle with an AC charging station, if the user opens the cover door of the in-vehicle AC outlet, the charging power is limited to 50% of the full charge power or other value within 200ms or other set time duration to ensure user safety. When the user inserts a discharge gun and controls the discharge, the in-vehicle AC outlet and the discharge gun share the power output of the on-board charger inverter, and the current is determined by the load.

[0052] When the onboard charger detects that the AC outlet current and temperature exceed the set ranges through the current detection circuit and temperature sampling circuit, and the current and temperature signals exceed thresholds, it controls the onboard motor to exit the current charging or discharging state and reports the corresponding fault signal to the display terminal (entertainment screen, instrument cluster, app), popping up the corresponding fault prompt and operation prompt. When the onboard charger is in the inverter / charging state, if it detects a fault such as a damaged AC outlet door, loss of communication with the ACIS detection board, or an open door, it switches to a shutdown state or reduces output power and reports the cause of the fault. For other faults such as insulation, total output overcurrent, or overvoltage, the existing off-vehicle discharge / charging strategy is reused. The onboard charger also needs to receive signals from the charging port door and similarly exit the inverter or charging state if it detects the charging port door is open or its status is lost.

[0053] For BMS, it is necessary to issue instructions to the on-board charger to start or stop charging and discharging based on the power status of the vehicle, the status of the charging port door, and the control instructions issued by the display end, and cooperate with the switching of the vehicle power relay to realize the corresponding function; BMS also needs to feedback the corresponding display signal of the relevant display controller based on the current charging and discharging status.

[0054] For the display controller's in-vehicle entertainment screen, instrument panel, and APP, it is necessary to design corresponding pop-up prompts based on the newly added in-vehicle socket fault prompt signal, and display corresponding control command buttons according to different scenarios to facilitate user operation.

[0055] Corresponding to the above circuit, the present application also discloses a car, which includes the in-car AC socket discharge circuit described in any one of the above embodiments.

[0056] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0057] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A discharge circuit for an AC socket in a vehicle, characterized in that: include: On-board charger, AC socket, AC charging port and socket status detector; The AC wiring harness of the AC charging port is connected to the AC socket and the on-board charger respectively, and the AC wiring harness includes a power live wire harness, a power neutral wire harness and a power ground wire harness; The socket status detector is equipped with a microprocessor and a low-voltage power supply circuit connected to the microprocessor, a signal transceiver, a temperature sampling circuit, a current detection circuit and a switch status detection circuit; The temperature sampling circuit is used to obtain the temperature signal of the AC socket; The current detection circuit is used to obtain the output current of the AC socket; The switch state detection circuit is used to obtain the switch signal of the small door of the AC socket; The output end of the signal transceiver is connected to the on-board charger; The microprocessor is used to pre-process the detection results of the temperature sampling circuit, the current detection circuit and the switch state detection circuit, and provide the processed detection results to the on-board charger.

2. The in-vehicle AC socket discharge circuit according to claim 1, characterized in that: The socket status detector is integrated inside the AC socket.

3. The in-vehicle AC socket discharge circuit according to claim 1, characterized in that: A fuse is disposed in the AC wiring harness.

4. The in-vehicle AC socket discharge circuit according to claim 1, characterized in that: Also includes: The BCM circuit is used to detect the switch status of the charging port door. The output end of the BCM circuit is connected to the on-board charger and the BMS. The BMS is the on-board battery management system.

5. The in-vehicle AC socket discharge circuit according to claim 4, characterized in that: The output end of the BCM circuit is connected to the on-board charger and the BMS through a gateway.

6. The in-vehicle AC socket discharge circuit according to claim 5, characterized in that: The gateway is also connected to an external interactive device to enable data interaction between the BMS and the external interactive device.

7. The in-vehicle AC socket discharge circuit according to claim 6, characterized in that: The external interactive device includes a car display screen, an instrument or a vehicle network system.

8. The in-vehicle AC socket discharge circuit according to claim 1, characterized in that: Also includes: The on-board charger is provided with a comparison circuit, which is used to obtain the comparison result between the temperature sampling circuit and the current detection circuit.

9. An automobile, characterized in that: include: The in-vehicle AC socket discharge circuit according to any one of claims 1 to 8.

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