Power supply circuit, vehicle and charging system

Abstract

The utility model provides a power supply circuit, a vehicle and a charging system, and belongs to the technical field of vehicle power supply. The power supply circuit comprises a first direct current region, a second direct current region and an alternating current region; wherein the first direct current domain comprises a first battery and a driving module, the alternating current domain comprises an electric energy management unit, and the electric energy management unit is used for supplying power to the first load module; the first end, the second end and the third end of the first battery are respectively connected with the first end of the electric energy management unit, the driving module and the second direct current basin; the second end of the electric energy management unit is connected with the first load module; the electric energy management unit is used for converting the first DC voltage into a target voltage and outputting the target voltage to the first load module; the first load module comprises at least part of direct current electric equipment or alternating current electric equipment in the vehicle. The power supply circuit can achieve the effect of reducing the power supply pressure of the direct current basin in the power supply circuit and the heating value of the power supply wire harness, and further can improve the safety of the power supply circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle power supply, in particular to a power supply circuit, a vehicle and a charging system. BACKGROUND

[0002] With the rapid development of new energy vehicles, more and more electrical equipment is arranged in the new energy vehicles, and the working voltages required by these electrical equipment are different, so the corresponding high and low voltage power supply architecture is also arranged in the new energy vehicles.

[0003] In the related art, the commonly used by the related technical personnel is "high voltage + 12V low voltage architecture" or "high voltage + 48V low voltage architecture", the high voltage part provides high voltage power for the V2L load interface, and the 12V or 48V low voltage part provides low voltage power for the low voltage electrical appliances in the new energy vehicle. Compared with 12V, the 48V low voltage power supply relieves the pressure of the increase of the power of the low voltage electrical appliances to a certain extent.

[0004] However, with the increase of high-power electrical appliances on the vehicle, the scheme of using 48V low voltage architecture in the related art still faces the problem of low voltage, which causes the power supply harness of the high-power electrical appliances to heat seriously. CONTENT OF THE INVENTION

[0005] The purpose of the present application is to provide a power supply circuit, a vehicle and a charging system, which can reduce the power supply pressure and the heating amount of the power supply harness in the direct current domain of the power supply circuit, and further improve the safety of the power supply circuit.

[0006] Embodiments of the present application are implemented as follows:

[0007] In a first aspect, the present application provides a power supply circuit applied to a vehicle, comprising: a first direct current domain, a second direct current domain and an alternating current domain; wherein the first direct current domain comprises a first battery and a driving module, the alternating current domain comprises an electric energy management unit, and the electric energy management unit is configured to supply power to a first load module.

[0008] The first end, the second end and the third end of the first battery are connected with the first end of the electric energy management unit, the driving module and the second direct current domain respectively; the first battery is configured to provide a first direct current voltage to the driving module, the second direct current domain and the electric energy management unit respectively; the driving module is configured to work under the action of the first direct current voltage; and the second direct current domain is configured to convert the first direct current voltage into a second direct current voltage and supply power to a direct current load based on the second direct current voltage.

[0009] A second end of the electric energy management unit is connected with the first load module; the electric energy management unit is configured to convert the first direct current voltage into a target voltage, and output the target voltage to the first load module; and the first load module comprises at least part of direct current electrical devices or alternating current electrical devices in the vehicle.

[0010] Optionally, the power supply circuit comprises a first isolation element.

[0011] A first end of the first isolation element is connected with a first end of the first battery, and a second end of the first isolation element is connected with a first end of the electric energy management unit.

[0012] Optionally, the first load module comprises at least a first alternating current electrical device or a first direct current electrical device in the vehicle.

[0013] Optionally, a second end of the electric energy management unit is further connected with an output interface, so as to supply power to a second alternating current electrical device outside through the output interface.

[0014] Optionally, the electric energy management unit is further configured to connect an external charging device, so as to receive alternating current charging electric energy output by the charging device.

[0015] The electric energy management unit is configured to charge the first battery based on the alternating current charging electric energy, and supply power to the first load module based on the alternating current charging electric energy, when the power of the alternating current charging electric energy is greater than a target demand power.

[0016] The electric energy management unit is further configured to control the first battery to output electric energy to the electric energy management unit, and supply power to the first load module based on the alternating current charging electric energy, when the output power of the alternating current charging electric energy is less than the target demand power.

[0017] The target demand power comprises a total power of the first load module and / or a second alternating current electrical device connected through the output interface.

[0018] Optionally, the second direct current domain comprises a voltage conversion unit configured to supply power to a second load module, the second load module being a direct current load supplied based on the second direct current voltage.

[0019] A first end of the voltage conversion unit is connected with a third end of the first battery, and a second end of the voltage conversion unit is connected with the second load module.

[0020] The voltage conversion unit is configured to convert the first direct current voltage into a second direct current voltage, and output the second direct current voltage to the second load module.

[0021] Optionally, the second load module at least includes a direct current device in the vehicle whose rated voltage meets the second direct current voltage.

[0022] Optionally, the power supply circuit includes a second isolation element.

[0023] The first end of the second isolation element is connected with the third end of the first battery, and the second end of the second isolation element is connected with the first end of the voltage conversion unit.

[0024] Optionally, the second load module at least includes a second battery and a second direct current device in the vehicle.

[0025] The voltage level of the second battery is less than the voltage level of the first battery.

[0026] Optionally, the first direct current voltage is greater than the second direct current voltage.

[0027] Optionally, the target voltage is less than or equal to the first direct current voltage.

[0028] In a second aspect, the embodiment of the present application provides a vehicle, which at least includes the power supply circuit in the first aspect.

[0029] In a third aspect, the embodiment of the present application provides a charging system, which includes a charging device and the vehicle in the second aspect.

[0030] The embodiment of the present application has the following beneficial effects:

[0031] The power supply circuit provided by the embodiment of the present application is provided with a first direct current domain, a second direct current domain and an alternating current domain, and the first direct current domain includes a first battery and a driving module, and the alternating current domain includes an electric energy management unit which is used for supplying power to a first load module. Specifically, the first end, the second end and the third end of the first battery are connected with the first end of the electric energy management unit, the driving module and the second direct current domain respectively, and the second end of the electric energy management unit is connected with the first load module.

[0032] The power supply circuit includes a first direct current domain with high-voltage direct current, a second direct current domain with low-voltage direct current and an alternating current domain. The first battery in the first direct current domain is used for directly supplying power to a driving module in the vehicle, and the second direct current domain is used for converting the first direct current voltage output by the first battery into a second direct current voltage to directly supply power to a direct current load in the second direct current domain. However, in the power supply circuit, the electric energy management unit in the alternating current domain is also connected with a first load module, the first load module includes an alternating current device or part of a direct current device in the vehicle, and the electric energy management unit can supply power to the first load module.

[0033] As can be seen from the above, based on the power supply circuit provided in this embodiment, some electrical equipment in the vehicle can be mounted on the AC domain and the power management unit, and the power management unit supplies power to the electrical equipment. In this way, the problem that the electrical equipment on the vehicle can only be supplied with power by the DC domain in the related art can be avoided.

[0034] In this way, the effect of reducing the power supply pressure of the DC domain and the heat amount of the power supply harness in the power supply circuit can be achieved, and the safety of the power supply circuit can be further improved. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0036] Figure 1 A structure schematic diagram of a first power supply circuit provided in the embodiments of the present application;

[0037] Figure 2 A structure schematic diagram of a second power supply circuit provided in the embodiments of the present application;

[0038] Figure 3 A structure schematic diagram of a third power supply circuit provided in the embodiments of the present application;

[0039] Figure 4 A structure schematic diagram of a fourth power supply circuit provided in the embodiments of the present application;

[0040] Figure 5 A structure schematic diagram of a charging system provided in the embodiments of the present application. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the application.

[0043] It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0044] In the description of the application, it should be noted that the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0045] In the description of the application, it should also be noted that unless otherwise specified and limited, the terms "set", "mount", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0046] In the related art, the related art personnel commonly used is "high-voltage + 12V low-voltage architecture" or "high-voltage + 48V low-voltage architecture", which provides high-voltage power for the V2L load interface from the high-voltage part, and provides low-voltage power for the low-voltage electrical appliances in the new energy vehicle from the 12V or 48V low-voltage part. Compared with 12V, 48V low-voltage power supply relieves the pressure of the increase of low-voltage electrical appliances power to a certain extent.

[0047] However, with the increase of high-power electrical appliances on the whole vehicle, the scheme of using 48V low-voltage architecture in the related art still faces the problem of low voltage, which leads to serious heating of the power supply harness of high-power electrical appliances.

[0048] In addition, some low-voltage electrical appliances in the new energy vehicle are directly mounted on the high-voltage bus side to be directly powered by the vehicle-mounted battery. However, the scheme of mounting the low-voltage electrical appliances on the high-voltage bus side may cause the failure of the whole vehicle power supply when the low-voltage electrical appliances fail, and this scheme also has the problem of low safety.

[0049] It can be seen that in the related art, the electrical energy management unit in the vehicle generally only supplies power to the power battery of the vehicle, and does not directly supply power to the load in the vehicle.

[0050] To at least solve the above-mentioned part of the technical problems, the embodiment of the application provides a power supply circuit, by setting a first direct current domain, a second direct current domain and an alternating current domain in the power supply circuit, and the first direct current domain includes a first battery and a driving module, the alternating current domain includes an electric energy management unit, and the electric energy management unit is used for supplying power to a first load module. Specifically, the first end, the second end and the third end of the first battery are connected with the first end of the electric energy management unit, the driving module and the second direct current domain respectively; and the second end of the electric energy management unit is connected with the first load module. The effect of reducing the power supply pressure of the direct current domain and the heat quantity of the power supply wire harness in the power supply circuit can be achieved, and the safety of the power supply circuit can be further improved.

[0051] The embodiment of the application takes the power supply circuit applied in a vehicle as an example for description. But it does not mean that the embodiment of the application can only be applied in the vehicle to provide a high and low voltage power supply scheme for the vehicle.

[0052] The power supply circuit provided by the embodiment of the application is explained and described in detail below.

[0053] Figure 1 The structure schematic diagram of the power supply circuit provided by the application is shown in the figure, and the power supply circuit can be applied in a vehicle. The vehicle can be any possible vehicle, such as a vehicle including at least one battery. Referring to Figure 1 The embodiment of the application provides a power supply circuit, which includes a first direct current domain A, a second direct current domain B and an alternating current domain C.

[0054] The first direct current domain A includes a first battery 101 and a driving module 102, and the alternating current domain C includes an electric energy management unit 103. The electric energy management unit 103 is used for supplying power to a first load module 104.

[0055] The first end, the second end and the third end of the first battery 101 are connected with the first end of the electric energy management unit 103, the driving module 102 and the second direct current domain B respectively.

[0056] The second end of the electric energy management unit 103 is connected with the first load module 104.

[0057] The first battery 101 is used for providing a first direct current voltage to the driving module 102, the second direct current domain B and the electric energy management unit 103 respectively.

[0058] In the embodiment, the first battery 101 can be a power battery in the vehicle, and the voltage level of the first battery 101 can be 110V, 200V, 400V or any possible voltage level.

[0059] Generally, the first battery 101 can provide electric energy for each high-voltage device and / or each low-voltage device in the vehicle. The embodiments of the present application do not make any limitation in this aspect.

[0060] It can be understood that the first end, the second end and the third end of the first battery 101 can all refer to the port of the output voltage of the first battery 101. For example, the first end, the second end and the third end of the first battery 101 can refer to the wires drawn from the positive electrode of the first battery 101 and connected to the power receiving end of the driving module 102, the second DC domain B and the electric energy management unit 103 respectively. The embodiments of the present application do not make any limitation in this aspect.

[0061] In the embodiment, the first DC voltage can refer to the voltage directly output by the power battery.

[0062] Optionally, the driving module 102 is configured to be powered on under the action of the first DC voltage.

[0063] The driving module 102 can refer to the electric drive assembly in the vehicle. For example, the driving module 102 can include any possible component such as a motor, a motor controller, a transmission, a reducer, etc. The embodiments of the present application do not make any limitation in this aspect.

[0064] In the embodiment, the driving module 102 generally needs a higher working voltage, i.e., the driving module 102 can be regarded as a high-voltage module. Moreover, when the driving module 102 is powered on under the driving of the first DC voltage, the driving module 102 can further provide power to the tire of the vehicle through a corresponding transmission device based on the driving instruction input by the user or the related technical personnel through the method such as stepping on the accelerator.

[0065] It can be seen that the first DC domain A can be a high-voltage DC domain in the power supply circuit.

[0066] The second DC domain B is configured to convert the first DC voltage into a second DC voltage and supply power to a DC load based on the second DC voltage.

[0067] Optionally, the second DC domain B can convert the first DC voltage into the second DC voltage through any possible way. For example, the conversion can be realized through a DC-DC converter or other possible element. The embodiments of the present application do not make any limitation in this aspect.

[0068] In the embodiment, the first DC voltage is greater than the second DC voltage.

[0069] Generally, the DC load can refer to low-voltage DC devices in the vehicle, and the power of the DC load can be low, such as any possible low-voltage, low-power device, such as a lighting device, an ignition switch, an audio device, etc. In addition, the low-voltage battery in the vehicle can also be a DC load to achieve the purpose of charging the low-voltage battery by the first battery 101. The embodiments of the present application do not limit this.

[0070] It can be seen that the second DC domain B can be a low-voltage DC domain in the power supply circuit.

[0071] In the embodiment, the electric energy management unit 103 is configured to convert the first DC voltage into a target voltage and output the target voltage to the first load module 104.

[0072] Optionally, the electric energy management unit 103 can be any possible on-board charger (OBC), and the electric energy management unit 103 can be a bidirectional on-board charger, that is, in the power supply circuit, the first battery 101 can supply power to the power supply circuit or other devices outside the vehicle through the electric energy management unit 103, and the first battery 101 can also be charged and powered by an external charging device (such as a charging pile) through the electric energy management unit 103.

[0073] For example, the electric energy management unit 103 can generally have the functions of DC / AC, AC / DC and DC / DC, and the electric energy management unit 103 can also adjust the current, voltage and power output to each element or device. The electric energy management unit 103 can also have other possible functions such as working parameter detection and fault detection, and the embodiments of the present application do not limit this.

[0074] Specifically, when converting the first DC voltage into the target voltage, the electric energy management unit 103 can convert the first DC voltage into a DC voltage or an AC voltage of a corresponding voltage level according to the actual power demand of the first load module 104. That is, the target voltage can be an AC voltage or a DC voltage, and the actual power demand of the first load module 104 can be determined, and the embodiments of the present application do not limit this.

[0075] In the embodiment, the target voltage is less than or equal to the first DC voltage, and in some special cases, the target voltage can also be greater than the first DC voltage. The embodiments of the present application do not limit this.

[0076] For example, if the power management unit 103 needs to output a direct current voltage to the first load module 104, the power management unit 103 can further internally include a corresponding rectifier bridge. Specifically, the first direct current voltage is first converted into an alternating current voltage, and then the alternating current voltage is converted into a direct current voltage by the rectifier bridge and output to the first load module 104. Other ways can also be implemented, which are not limited in the embodiments of the present application.

[0077] Optionally, the first load module 104 includes at least part of the direct current electrical equipment or alternating current electrical equipment in the vehicle.

[0078] For example, the first load module 104 can include 220V or other voltage level alternating current electrical equipment in the vehicle, such as any possible alternating current electrical equipment in the vehicle, such as a vehicle refrigerator, a vehicle television, etc. The first load module 104 can include part of the low-voltage direct current device in the vehicle. Generally, the power of the direct current electrical equipment in the first load module 104 can be relatively large, such as a cooling fan, an oil pump, a water pump, and other low-voltage and high-power direct current devices.

[0079] In addition, the first load module 104 can further include a compressor / heater device (AC / PTC) in the vehicle, which is not limited in the embodiments of the present application.

[0080] Furthermore, the first load module 104 can be arranged in the alternating current domain C or outside the alternating current domain C, which is not limited in the embodiments of the present application.

[0081] It can be understood that the first direct current domain A, the second direct current domain B, and the alternating current domain C provided in the embodiments of the present application can refer to the concept of voltage domain or power domain, that is, the voltage of each element in the first direct current domain A is the same, the voltage of each element in the second direct current domain B is the same, and the voltage of each element in the alternating current domain C is the same. The embodiments of the present application are not limited in this regard.

[0082] It should be noted that in the above or other related technical solutions, all direct current devices in the vehicle are mounted on the direct current side, such as the above-mentioned cooling fan, oil pump, water pump, vehicle refrigerator, vehicle television, compressor / heater device, etc. which are powered by direct current voltage. Specifically, the compressor / heater device is generally directly mounted on the power battery of the vehicle, and the cooling fan, oil pump, water pump, vehicle refrigerator, vehicle television, etc. are generally mounted in the low-voltage direct current domain of the vehicle. The power management unit of the vehicle is only responsible for charging the power battery or outputting alternating current to other devices outside the vehicle. Therefore, the related technical solution has the problems of high direct current domain power supply pressure and serious power supply wire bundle heating.

[0083] It is worth noting that, from the above, it can be seen that the power supply circuit provided by the embodiment includes the first DC domain A of high-voltage DC, the second DC domain B of low-voltage DC, and the AC domain C. Moreover, the first battery 101 in the first DC domain A is used to directly supply power to the driving module 102 in the vehicle, and the second DC domain B is used to convert the first DC voltage output by the first battery 101 into a second DC voltage to directly supply power to the DC load in the second DC domain B. However, in the power supply circuit, the first load module 104 is also hung on the power management unit 103 of the AC domain C, and the first load module 104 includes AC electrical equipment or part of DC electrical equipment in the vehicle, and the power management unit 103 can supply power to the first load module 104.

[0084] As can be seen from the above, based on the power supply circuit provided by the embodiment, some electrical equipment in the vehicle can be hung on the AC domain C and the power management unit 103, and powered by the power management unit 103. In this way, the problem that only the DC domain can provide power to the electrical equipment on the vehicle in the related art can be avoided, and the power supply pressure of the DC domain and the heat amount of the power supply harness in the power supply circuit can be reduced, thereby solving the above-mentioned technical problems.

[0085] In the embodiment of the present application, the first DC domain A, the second DC domain B and the AC domain C are arranged in the power supply circuit, and the first DC domain A includes the first battery 101 and the driving module 102, the AC domain C includes the power management unit 103, and the power management unit 103 is used to supply power to the first load module 104. Specifically, the first end, the second end and the third end of the first battery 101 are connected with the first end of the power management unit 103, the driving module 102 and the second DC domain B respectively, and the second end of the power management unit 103 is connected with the first load module 104.

[0086] In the power supply circuit, the first DC domain A of high-voltage DC, the second DC domain B of low-voltage DC, and the AC domain C are included. Moreover, the first battery 101 in the first DC domain A is used to directly supply power to the driving module 102 in the vehicle, and the second DC domain B is used to convert the first DC voltage output by the first battery 101 into a second DC voltage to directly supply power to the DC load in the second DC domain B. However, in the power supply circuit, the first load module 104 is also hung on the power management unit 103 of the AC domain C, and the first load module 104 includes AC electrical equipment or part of DC electrical equipment in the vehicle, and the power management unit 103 can supply power to the first load module 104.

[0087] As can be seen, based on the power supply circuit provided in this embodiment, some electrical equipment in the vehicle can be mounted on the AC domain C and the power management unit 103, and the power management unit 103 supplies power to these electrical equipment. In this way, the problem that the electrical equipment on the vehicle can only be supplied with power by the DC domain in the related art can be avoided.

[0088] In this way, the effect of reducing the power supply pressure of the DC domain in the power supply circuit and the heat amount of the power supply harness can be achieved, and the safety of the power supply circuit can be further improved.

[0089] In addition, since the power management unit 103 can be a bidirectional power management unit, and the bidirectional power management unit has a certain isolation function, the power supply circuit can also realize isolation between the first DC domain A and the AC domain C, and interference between the first DC domain A and the AC domain C can be avoided as much as possible. In this way, the safety of the power supply circuit can be further improved.

[0090] In a possible implementation manner, referring to Figure 2 The power supply circuit includes a first isolation element U1.

[0091] The first end of the first isolation element U1 is connected with the first end of the first battery 101, and the second end of the first isolation element U1 is connected with the first end of the power management unit 103.

[0092] Optionally, the first isolation element U1 can be any possible isolation device, such as an optical coupling isolator, an isolation transformer, a digital isolator, or any possible device, and the embodiments of the present application do not limit this.

[0093] Generally, the first isolation element U1 can be independently arranged outside the first DC domain A and the AC domain C, or the first isolation element U1 can be arranged in the first DC domain A or the AC domain C, and the embodiments of the present application do not limit this.

[0094] In this way, the first isolation element U1 can further electrically isolate the first DC domain A and the AC domain C, and when the power management unit 103 or the first load module 104 in the AC domain C fails, it will not affect the bus side connected with the first battery 101 in the first DC domain A, and the safety of the power supply circuit can be further improved.

[0095] In a possible implementation manner, referring to Figure 2 The first load module 104 at least includes a first AC electrical equipment 1041 or a first DC electrical equipment 1042 in the vehicle.

[0096] The rated power of the first DC electrical equipment 1042 is greater than a preset threshold.

[0097] Optionally, the first AC electrical device 1041 can be any possible AC device, for example, the first AC electrical device 1041 can include an AC type of vehicle-mounted television, an AC type of vehicle-mounted refrigerator, an AC type of compressor and / or an AC type of heating device, and any other possible AC type of device that can be arranged inside the vehicle.

[0098] Optionally, the first DC electrical device 1042 can be any possible DC device, for example, the first DC electrical device 1042 can include a DC type of vehicle-mounted television, a DC type of vehicle-mounted refrigerator, a DC type of compressor and / or a DC type of heating device, and any other possible DC type of device that can be arranged inside the vehicle.

[0099] Optionally, the preset threshold value can be set by a related technician according to actual needs, for example, the preset threshold value can be 1 kW, 2 kW or any other possible numerical value, and the embodiments of the present application do not make any limitation in this aspect.

[0100] In this way, it can be ensured that the AC domain C and the power management unit 103 can supply power to the AC devices or the DC devices with larger power inside the vehicle, and the power supply pressure of the first DC domain A and the second DC domain B can be reduced.

[0101] In one possible implementation manner, continuing to refer to Figure 3 The second end of the power management unit 103 is also connected with an output interface 107, so as to supply power to an external second AC electrical device through the output interface 107.

[0102] Optionally, the output interface 107 can be any possible interface, and the output interface 107 can generally be an interface for supplying power to an external device in the vehicle.

[0103] For example, the output interface 107 can be a V2L interface.

[0104] It is worth noting that the second end of the power management unit 103 can refer to an output end of the power management unit 103, and the power management unit 103 can have a plurality of second ends, so that the power management unit 103 supplies power to different electrical devices through the respective second ends, and the embodiments of the present application do not make any limitation in this aspect.

[0105] In this way, the practicability of the power supply circuit can be improved.

[0106] In one possible implementation manner, continuing to refer to Figure 3 The power management unit 103 is also used for connecting an external charging device, so as to receive AC charging power output by the charging device.

[0107] The power management unit 103 is configured to charge the first battery 101 based on the AC charging power when the output power of the AC charging power is greater than the target demand power. Meanwhile, the power management unit 103 can also supply power to the first load module 104 based on the AC charging power.

[0108] That is, the power management unit 103 can supply power to the first load module 104 based on the AC charging power while charging the first battery 101 based on the AC charging power.

[0109] That is, the power management unit 103 can supply power to the first load module 104 based on the AC charging power while charging the first battery 101 based on the AC charging power.

[0110] In this embodiment, the power management unit 103 is also configured to control the first battery 101 to output power to the power management unit 103 when the output power of the AC charging power is less than the target demand power. Meanwhile, the power management unit 103 can also output the AC charging power to the first load module 104.

[0111] That is, the power management unit 103 can supply power to the first load module 104 based on the AC charging power while controlling the first battery 101 to output power to the power management unit 103.

[0112] That is, the power management unit 103 can supply power to the first load module 104 based on the AC charging power while charging the first battery 101 based on the AC charging power.

[0113] Specifically, the power management unit 103 can control each bridge arm provided in the power management unit 103 so that the first battery 101 and the charging device supply power to the first load module 104 and / or the second AC power consuming device at the same time.

[0114] In addition, the power management unit 103 can also output the AC charging power to the first load module 104 when the power of the AC charging power is equal to the target demand power.

[0115] Optionally, the charging device can be any device capable of outputting alternating current, such as a charging pile. The charging device can be connected to the electric energy management unit 103 through a charging interface, and perform handshake communication with the electric energy management unit 103. The embodiments of the present application do not limit this.

[0116] Optionally, the target demand power includes the total power of the first load module 104 and / or the second alternating current electrical equipment connected through the output interface 107.

[0117] Optionally, the alternating current charging electric energy power can refer to the maximum power that the charging device can output at the current moment. Specifically, the electric energy management unit 103 can determine the output power of the alternating current charging electric energy by handshake communication with the charging device, and the embodiments of the present application do not limit this.

[0118] It can be understood that if the alternating current charging electric energy is not input into the electric energy management unit 103, the electric energy management unit 103 can control the first battery 101 to supply power to the first load module 104 and / or the second alternating current electrical equipment through the electric energy management unit 103.

[0119] In addition, the electric energy management unit 103 can also adjust the power of the first load module 104 and / or the second alternating current electrical equipment based on the power of the first battery 101 and / or the alternating current charging electric energy. For example, in the case that the power of the alternating current charging electric energy is less than the target demand power, and the power of the first battery 101 is lower than the preset power, the power output to the second alternating current electrical equipment is reduced. The embodiments of the present application do not limit this.

[0120] In one possible implementation manner, referring to Figure 4 The second direct current domain B includes a voltage conversion unit 105, and the voltage conversion unit 105 is configured to supply power to the second load module 106.

[0121] The first end of the voltage conversion unit 105 is connected to the third end of the first battery 101, and the second end of the voltage conversion unit 105 is connected to the second load module 106.

[0122] The voltage conversion unit 105 is configured to convert the first direct current voltage into a second direct current voltage, and output the second direct current voltage to the second load module 106.

[0123] Optionally, the voltage conversion unit 105 can be a DC-DC converter, and the voltage conversion unit 105 can be specifically configured to step down.

[0124] Optionally, the second load module 106 can be a direct current load powered based on the second direct current voltage.

[0125] In the embodiment, the second load module 106 can include at least a direct current device in the vehicle whose rated voltage meets the second direct current voltage, and the rated power of the direct current device in the second load module 106 is less than a preset threshold.

[0126] Optionally, if the first direct current voltage is 400V, the second direct current voltage can be 12V or 48V, which is not limited in the embodiment.

[0127] For example, the second load module 106 can include at least a second battery 1061 and a second direct current device 1062 in the vehicle. Moreover, the second load module 106 can be arranged in the second direct current domain B or outside the second direct current domain B, which is not limited in the embodiment.

[0128] Optionally, the voltage level of the second battery 1061 is less than the voltage level of the first battery 101.

[0129] For example, the rated power of the second direct current device 1062 can be less than the preset threshold. In this way, the second direct current domain B only needs to supply power to the direct current device with small power in the vehicle, thereby reducing the power supply pressure and the heat amount of the power supply harness of the second direct current domain B.

[0130] Optionally, the preset threshold can be set by the related technical personnel according to actual needs, for example, the preset threshold can be 1kW, 2kW or any other possible value, which is not limited in the embodiment.

[0131] For example, the second battery 1061 can be a low-voltage battery in the vehicle, that is, the first battery 101 can charge the second battery 102,

[0132] For another example, the second direct current device 1062 can be any possible low-voltage and low-power device such as a lighting device, an ignition switch, an audio device and the like in the vehicle.

[0133] In this way, it can be ensured that the second direct current domain B can only supply power to the direct current device with small power in the vehicle, and the power supply pressure of the first direct current domain A and the second direct current domain B can be reduced.

[0134] In a possible implementation manner, referring to Figure 4 The power supply circuit includes a second isolation element U2.

[0135] The first end of the second isolation element U2 is connected with the third end of the first battery 101, and the second end of the second isolation element U2 is connected with the first end of the voltage conversion unit 105.

[0136] Optionally, the second isolation element U2 can be any possible isolation device, such as an optical coupling isolator, an isolation transformer, a digital isolator, or any possible device, and the embodiments of the present application do not make any limitation in this regard.

[0137] Generally, the isolation element U2 can be independently arranged outside the first DC domain A and the second DC domain B, or the second isolation element U2 can be arranged in the first DC domain A or the second DC domain B, and the embodiments of the present application do not make any limitation in this regard.

[0138] In this way, the first DC domain A and the second DC domain B can be further electrically isolated by the second isolation element U2, and when the voltage conversion unit 105 or the second load module 106 in the second DC domain B fails, it will not affect the bus side connected to the first battery 101 in the first DC domain A, further improving the safety of the power supply circuit.

[0139] The following describes the vehicle, charging system, and the like including the power supply circuit provided by the present application, and the specific implementation process and technical effects are described above, and the following will not be repeated.

[0140] The embodiments of the present application provide a vehicle, which at least includes the power supply circuit provided by any of the above embodiments.

[0141] Optionally, the vehicle can further include a chassis, a control device, a display device, an audio device, and any other possible device, and the embodiments of the present application do not make any limitation in this regard.

[0142] Figure 5 is a structural schematic diagram of a charging system provided by the embodiments of the present application, referring to Figure 5 The charging system includes a vehicle L and a charging device S.

[0143] Among them, the vehicle L can refer to the vehicle including the power supply circuit provided by any of the above embodiments.

[0144] The charging device S can refer to a device providing AC charging power to the above power supply circuit, and the embodiments of the present application do not make any limitation in this regard.

[0145] The above vehicle and the above charging system respectively include the power supply circuit provided by the above embodiments, that is, the power supply circuit, the vehicle, and the charging system belong to the same design concept, and the implementation principle and technical effects are similar, which will not be repeated here.

[0146] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0147] The above descriptions are only the preferred embodiment of the present application, but not for limiting the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A power supply circuit, characterized by comprising: The power supply circuit applied to a vehicle comprises a first direct current domain, a second direct current domain and an alternating current domain; wherein the first direct current domain comprises a first battery and a driving module, the alternating current domain comprises an electric energy management unit, and the electric energy management unit is configured to supply power to a first load module; a first end, a second end and a third end of the first battery are connected with a first end of the electric energy management unit, the driving module and the second direct current domain respectively; the first battery is configured to provide a first direct current voltage to the driving module, the second direct current domain and the electric energy management unit respectively; the driving module is configured to work under the action of the first direct current voltage; the second direct current domain is configured to convert the first direct current voltage into a second direct current voltage, and supply power to a direct current load based on the second direct current voltage; a second end of the electric energy management unit is connected with the first load module; the electric energy management unit is configured to convert the first direct current voltage into a target voltage, and output the target voltage to the first load module; the first load module comprises at least part of direct current electrical equipment or alternating current electrical equipment in the vehicle.

2. The power supply circuit of claim 1, wherein, The power supply circuit further comprises a first isolation element; a first end of the first isolation element is connected with the first end of the first battery, and a second end of the first isolation element is connected with the first end of the electric energy management unit.

3. The power supply circuit of claim 2, wherein, The first load module comprises at least a first alternating current electrical equipment or a first direct current electrical equipment in the vehicle.

4. The power supply circuit of claim 1, wherein, The second end of the electric energy management unit is further connected with an output interface, so as to supply power to an external second alternating current electrical equipment through the output interface.

5. The power supply circuit of claim 4, wherein, The electric energy management unit is further configured to connect an external charging device, so as to receive alternating current charging electric energy output by the charging device; wherein, when the power of the alternating current charging electric energy is greater than a target demand power, the electric energy management unit is configured to charge the first battery based on the alternating current charging electric energy, and supply power to the first load module based on the alternating current charging electric energy; when the power of the alternating current charging electric energy is less than the target demand power, the electric energy management unit is further configured to control the first battery to output electric energy to the electric energy management unit, and supply power to the first load module based on the alternating current charging electric energy; the target demand power comprises a total power of the first load module and / or a second alternating current electrical equipment connected through the output interface.

6. The power supply circuit of claim 1, wherein, The second direct current domain comprises a voltage conversion unit configured to supply power to a second load module, and the second load module is a direct current load supplied with power based on the second direct current voltage; a first end of the voltage conversion unit is connected with the third end of the first battery, and a second end of the voltage conversion unit is connected with the second load module; wherein, the voltage conversion unit is configured to convert the first direct current voltage into a second direct current voltage, and output the second direct current voltage to the second load module.

7. The power supply circuit of claim 6, wherein, The second load module comprises at least a direct current device in the vehicle with a rated voltage meeting the second direct current voltage.

8. The power supply circuit of claim 6, wherein, The power supply circuit further comprises a second isolation element; The first end of the second isolation element is connected to the third end of the first battery, and the second end of the second isolation element is connected to the first end of the voltage conversion unit.

9. The power supply circuit of claim 6, wherein, The second load module at least includes a second battery and a second DC electrical device in the vehicle. The voltage level of the second battery is less than the voltage level of the first battery.

10. The power supply circuit of any one of claims 1-9, wherein, The first DC voltage is greater than the second DC voltage.

11. The power supply circuit of any one of claims 1-9, wherein, The target voltage is less than or equal to the first DC voltage.

12. A vehicle characterized by comprising: The vehicle at least includes the power supply circuit according to any one of claims 1 to 11.

13. A charging system, characterized by The charging system includes a charging device and the vehicle according to claim 12.

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