Low-voltage integrated power distribution framework and automobile

Abstract

The utility model discloses a low-voltage integrated power distribution framework and an automobile, the low-voltage integrated power distribution framework comprises a high-voltage input end, a DCDC circuit, a low-voltage management circuit, a low-voltage power distribution circuit and a low-voltage storage battery, and the low-voltage power distribution circuit is provided with a low-voltage power supply end used for being connected with a low-voltage load; one end of the low-voltage power distribution circuit is connected with the low-voltage storage battery through the low-voltage management circuit, the other end of the low-voltage power distribution circuit is connected with the high-voltage input end through the DCDC circuit, and the DCDC circuit, the low-voltage management circuit, the low-voltage power distribution circuit and the low-voltage storage battery are integrated together and share the same controller. A function of managing the low-voltage management circuit, the low-voltage power distribution circuit and the DCDC circuit is integrated in the controller, so that the weight and the size of a power distribution framework are reduced, and the probability of damage of parasitic inductance or parasitic capacitance between the DCDC circuit and the low-voltage storage battery to circuits in a vehicle is reduced.

Description

Technical Field

[0001] This application relates to the technical field of automobiles, and particularly to a low-voltage integrated power distribution architecture and an automobile. Background Art

[0002] Existing body low-voltage power distribution usually adopts discrete low-voltage lithium-ion battery technology, and a fuse box product is equipped based on a low-voltage battery to achieve primary power distribution for vehicle loads. Then, the battery management system manages the low-voltage lithium-ion battery. Inside the vehicle, both the DCDC circuit and the low-voltage battery are single parts. When the overcurrent protection of the low-voltage battery actively shuts off the protection switch, it is equivalent to a load-dropping condition. At this time, the cable between the DCDC circuit and the low-voltage battery has the effect of inductance, and this cable generates a large potential, posing a risk of overvoltage damage to the components in the circuit. Summary of the Utility Model

[0003] In view of the above problems, this application provides a low-voltage integrated power distribution architecture and an automobile, which can solve the problem that the cable between the DCDC circuit and the low-voltage battery in the current vehicle power supply frame has the effect of inductance, and this cable generates a large potential when transmitting high-voltage electricity, which will damage the components in the circuit.

[0004] The first aspect of the embodiment of this application provides a low-voltage integrated power distribution architecture, including: a high-voltage input terminal, a DCDC circuit, a low-voltage management circuit, a low-voltage power distribution circuit, and a low-voltage battery;

[0005] The low-voltage power distribution circuit is configured with a low-voltage power supply terminal for connecting to a low-voltage load;

[0006] One end of the low-voltage power distribution circuit is connected to the low-voltage battery via the low-voltage management circuit;

[0007] The other end of the low-voltage power distribution circuit is connected to the high-voltage input terminal via the DCDC circuit;

[0008] The DCDC circuit, the low-voltage management circuit, and the low-voltage power distribution circuit share the same controller, and the controller integrates the function of managing the working states of the low-voltage management circuit, the low-voltage power distribution circuit, and the DCDC circuit.

[0009] In the technical solution of the embodiment of the present application, the low-voltage power distribution circuit is configured with a low-voltage power supply terminal for accessing low-voltage loads. One end of the low-voltage power distribution circuit is connected to the low-voltage battery via the low-voltage management circuit, and the other end of the low-voltage power distribution circuit is connected to the high-voltage input terminal via the DCDC circuit. The DCDC circuit, the low-voltage management circuit, and the low-voltage power distribution circuit share the same controller. By integrating the function of managing the working states of the low-voltage management circuit, the low-voltage power distribution circuit, and the DCDC circuit in the controller, the DCDC circuit, the low-voltage management circuit, the low-voltage power distribution circuit, and the low-voltage battery are integrated together, which not only reduces the weight and volume of the power distribution architecture, but also reduces the probability that the parasitic inductance or parasitic capacitance between the DCDC circuit and the low-voltage battery damages the vehicle's internal circuit, and reduces the communication time between each module.

[0010] In some embodiments, the DCDC circuit is used to convert the high-voltage power input from the high-voltage input terminal into a low-voltage power supply and output it to the low-voltage power distribution circuit, or to convert the low-voltage power supply provided by the low-voltage battery into high-voltage power and output it to the high-voltage input terminal;

[0011] The low-voltage management circuit is controlled by the controller to manage the charging and discharging of the low-voltage battery.

[0012] In the technical solution of the embodiment of the present application, the DCDC circuit has the function of bidirectional voltage conversion. It can not only convert the high-voltage power input from the high-voltage input terminal into a low-voltage power supply and output it to the low-voltage power distribution circuit under the control of the controller, but also convert the low-voltage power supply provided by the low-voltage battery into high-voltage power and output it to the high-voltage input terminal under the control of the controller, so as to pre-charge the power battery pack connected to the high-voltage input terminal. The low-voltage management circuit can manage the charging and discharging of the low-voltage battery under the control of the controller. By integrating the DCDC circuit with the low-voltage battery and the low-voltage management circuit together, the probability that the parasitic inductance or parasitic capacitance between the DCDC circuit and the low-voltage battery damages the vehicle's internal circuit can be reduced, and the communication time between each module can be reduced, so as to achieve the purpose of reducing delay and improving the performance of the vehicle's power distribution architecture.

[0013] In some embodiments, the low-voltage power distribution circuit includes a first energy transmission link, a second energy transmission link, and a third energy transmission link. The first energy transmission link is the energy transmission path from the DCDC circuit to the low-voltage power supply terminal, the second energy transmission link is the energy transmission path from the low-voltage management circuit to the low-voltage power supply terminal, and the third energy transmission link is the energy transmission path from the DCDC circuit to the low-voltage battery;

[0014] The DCDC circuit, the low-voltage management circuit, and the low-voltage power distribution circuit are controlled by the same controller to control the energy transfer directions of the first energy transfer link, the second energy transfer link, and the third energy transfer link.

[0015] In some embodiments, the low-voltage management circuit includes:

[0016] A detection module, connected to the controller, for detecting the electrical parameters of the low-voltage battery;

[0017] The controller is further configured to manage the working state of the low-voltage power distribution circuit according to the electrical parameters of the low-voltage battery.

[0018] In the technical solution of the embodiment of the present application, the detection module detects the electrical parameters of the low-voltage battery, and the controller manages the working state of the low-voltage power distribution circuit according to the electrical parameters of the low-voltage battery. The electrical parameters of the low-voltage battery may include parameters such as the temperature, voltage, current, battery health, and remaining power of the low-voltage battery. By comprehensively monitoring the low-voltage battery, the output stability of the low-voltage battery is ensured, the stability of the external power supply of the low-voltage power distribution circuit is ensured, and the low-voltage power distribution circuit is connected to the high-voltage input end via the DCDC circuit. When the low-voltage battery is unstable, the high-voltage power input from the high-voltage input end can be converted into a low-voltage power supply by the DCDC circuit to supply power to the low-voltage power distribution circuit of the whole vehicle, playing a redundant role, thereby providing a safe and reliable power supply for the low-voltage loads of the whole vehicle and ensuring the safety of the low-voltage power distribution system of the vehicle.

[0019] In some embodiments, the detection module is further configured to perform periodic sampling on the electrical parameters of the low-voltage battery;

[0020] The controller adjusts the working states of the DCDC circuit and the low-voltage power distribution circuit according to the electrical parameters of the low-voltage battery, so as to adjust the voltage of the low-voltage power supply output from the DCDC circuit to the low-voltage management circuit according to the electrical parameters of the low-voltage battery.

[0021] In some embodiments, the low-voltage management circuit further includes: a first bidirectional switch module controlled by the controller;

[0022] The first bidirectional switch module is configured to manage the charging and discharging process of the low-voltage battery under the control of the controller.

[0023] In the technical solution of the embodiment of the present application, the first bidirectional switch module functions as a bidirectional switch. The first bidirectional switch module can be controlled by a controller. Through the controller, the working state of the first bidirectional switch module can be controlled, so that the current at the first end of the first bidirectional switch module is output from its second end, and the current at the second end cannot be output through the first end, or the current at the second end of the first bidirectional switch module is output from its first end, and the current at the first end cannot be output through its second end, thereby controlling the charging and discharging processes of the low-voltage battery and realizing the management of the low-voltage battery.

[0024] In some embodiments, the low-voltage battery is electrically connected to the low-voltage power distribution circuit through the first bidirectional switch module.

[0025] In some embodiments, the low-voltage power distribution circuit further includes: a second bidirectional switch module controlled by the controller;

[0026] The second bidirectional switch module is used to control the connection state between the DCDC circuit and the low-voltage management circuit, and control the current direction between the DCDC circuit and the low-voltage management circuit.

[0027] In the technical solution of the embodiment of the present application, the second bidirectional switch module functions as a bidirectional switch. The second bidirectional switch module can be controlled by a controller. Through the controller, the working state of the second bidirectional switch module can be controlled, thereby controlling the current direction between the DCDC circuit and the low-voltage management circuit, achieving the purpose of charging the low-voltage battery via the second bidirectional switch module by the DCDC circuit or pre-charging the power battery pack connected to the high-voltage input end by the low-voltage battery via the second bidirectional switch module.

[0028] In some embodiments, the low-voltage power distribution circuit further includes: a first load switch module controlled by the controller;

[0029] The first load switch module is connected between the first end of the second bidirectional switch module and the first low-voltage load power supply end.

[0030] In the technical solution of the embodiment of the present application, the first end of the second bidirectional switch module can be connected to the low-voltage battery via the first bidirectional switch module. The first end of the first load switch module is connected to the first end of the second bidirectional switch module, and the first end of the first load switch module can also be connected to the low-voltage battery via the first bidirectional switch module. In this way, the first load switch module can control the power output of the low-voltage power distribution circuit to the power supply end of the first low-voltage load. The power supply end of the first low-voltage load can be connected to the low-voltage loads related to vehicle driving safety and vehicle start. Therefore, when the first bidirectional switch module is turned on, the low-voltage battery supplies power to the power supply end of the first low-voltage load. The second bidirectional switch module can control the connection state between the DCDC circuit and the power supply end of the first low-voltage load. When the power output of the low-voltage battery is unstable, the controller can control the second bidirectional switch module to supply power to the power supply end of the first low-voltage load through the DCDC circuit via the second bidirectional switch module and the first load switch module, playing a redundant role, thereby providing safe and reliable power supply for the vehicle's low-voltage loads and also disconnecting the second bidirectional switch module when the DCDC circuit fails, ensuring the safety of the vehicle's low-voltage power distribution system.

[0031] In some embodiments, the low-voltage power distribution circuit further includes: a second load switch module controlled by the controller;

[0032] The second load switch module is connected between the second end of the second bidirectional switch module and the second low-voltage load power supply end.

[0033] In the technical solution of the embodiment of the present application, the first end of the second bidirectional switch module can be connected to the low-voltage battery via the first bidirectional switch module. The second end of the second bidirectional switch module is connected to the DCDC circuit, and the DCDC circuit is connected to the second low-voltage load power supply end via the fourth switch circuit. The second low-voltage load power supply end can be connected to the comfort loads and entertainment loads inside the vehicle. The first end of the second load switch module can also be connected to the low-voltage battery via the second bidirectional switch module and the first bidirectional switch module. At the same time, the DCDC circuit can directly supply power to the second low-voltage load power supply end via the second load switch module. In this way, the second load switch module can control the power output of the low-voltage power distribution circuit to the second low-voltage load power supply end. Therefore, when the first bidirectional switch module and the second bidirectional switch module are turned on, the low-voltage battery supplies power to the second low-voltage load power supply end, or when the power output of the low-voltage battery is unstable, the controller can control the DCDC circuit and the second load switch module to supply power to the second low-voltage load power supply end through the DCDC circuit via the second load switch module, playing a redundant role, thereby providing safe and reliable power supply for the vehicle's low-voltage loads and ensuring the safety of the vehicle's low-voltage power distribution system.

[0034] In some embodiments, the low-voltage power distribution circuit, the low-voltage management circuit, and the DCDC circuit are integrated on the same circuit board.

[0035] In the technical solution of the embodiment of the present application, the low-voltage power distribution circuit, the low-voltage management circuit, and the DCDC circuit are integrated on the same circuit board, and the DCDC circuit, the low-voltage management circuit, and the low-voltage power distribution circuit share the same controller. By integrating the function of managing the working states of the low-voltage management circuit, the low-voltage power distribution circuit, and the DCDC circuit in the controller, the DCDC circuit, the low-voltage management circuit, the low-voltage power distribution circuit, and the low-voltage battery are integrated together, which not only reduces the weight and volume of the power distribution architecture, but also reduces the probability of damage to the vehicle's internal circuit caused by the parasitic inductance or parasitic capacitance between the DCDC circuit and the low-voltage battery, and reduces the communication time between each module.

[0036] In some embodiments, the low-voltage integrated power distribution architecture further includes:

[0037] A temperature control pipeline, in which a cooling medium is provided; the temperature control pipeline is used for cooling and heating management of the low-voltage power distribution circuit, the low-voltage management circuit, and the DCDC circuit.

[0038] In some embodiments, the DCDC circuit includes a multi-winding transformer, a first rectifier-inverter circuit, and a second rectifier-inverter circuit;

[0039] The first winding of the multi-winding transformer is connected to the high-voltage input terminal via the first rectifier-inverter circuit, and the second winding and the third winding of the multi-winding transformer are connected to the low-voltage power distribution circuit via the second rectifier-inverter circuit; the second winding and the third winding are in parallel.

[0040] In some embodiments, the low-voltage integrated power distribution architecture further includes a low-voltage input terminal, which is used to access the battery pack in the power battery pack;

[0041] The DCDC circuit further includes a third rectifier-inverter circuit, and the fourth winding of the multi-winding transformer is connected to the low-voltage input terminal via the third rectifier-inverter circuit.

[0042] In the technical solution of the embodiment of the present application, the power battery pack includes at least two battery units, the battery group includes some battery units in the power battery pack, the operating states of the first rectifier-inverter circuit, the second rectifier-inverter circuit, and the third rectifier-inverter circuit are controlled by a controller. The first rectifier-inverter circuit is connected between the power battery pack and the first winding, the second rectifier-inverter circuit is connected between the low-voltage power distribution circuit and the second winding and the third winding, and the third rectifier-inverter circuit is connected between the battery group and the fourth winding, which can enable the low-voltage power distribution circuit to be connected to the power battery pack and the battery group in the power battery pack via the multi-winding integrated transformer at the same time. By controlling the operating states of the first rectifier-inverter circuit, the second rectifier-inverter circuit, and the third rectifier-inverter circuit by the controller, the primary and secondary settings of the first winding, the second winding, the third winding, and the fourth winding can be determined, so as to adjust the energy transfer direction between the windings. It can not only realize the function of providing low-voltage power distribution for the entire vehicle by the power battery pack, but also match the current transfer direction among the power battery pack, the battery group, and the low-voltage power distribution circuit according to the vehicle's power consumption requirements. Through the low-voltage integrated power distribution architecture of the present application, in the case of a failure of the low-voltage battery, the power battery pack or the battery group in the power battery pack can be reused to supply power to the low-voltage power distribution circuit, thus playing a redundant role and ensuring the safety of the vehicle's low-voltage power distribution system.

[0043] In some embodiments, the first rectifier-inverter circuit is a half-bridge inverter or a full-bridge inverter; and / or the second rectifier-inverter circuit is a half-bridge inverter or a full-bridge inverter; and / or the third rectifier-inverter circuit is a half-bridge inverter or a full-bridge inverter.

[0044] In the technical solution of the embodiment of the present application, the first rectifier-inverter circuit, the second rectifier-inverter circuit, and the third rectifier-inverter circuit can be full-bridge rectifier-inverter circuits or half-bridge rectifier-inverter circuits, and the third rectifier-inverter circuit can be a half-bridge rectifier circuit. The first rectifier-inverter circuit, the second rectifier-inverter circuit, and the third rectifier-inverter circuit are controlled by the controller to convert the direct current output by the power battery pack into alternating current and output it to the first winding. The third rectifier-inverter circuit is controlled by the controller to convert the direct current output by the battery pack into alternating current and output it to the fourth winding, or convert the alternating current induced and output by the fourth winding into direct current and output it to the battery pack. The second rectifier-inverter circuit is controlled by the controller to convert the alternating current induced and output by the second winding and the third winding into direct current and output it to the low-voltage power distribution circuit. Both the power battery pack and the battery pack in the power battery pack can supply power to the low-voltage power distribution circuit via the multi-winding integrated transformer. It can not only realize the function of providing low-voltage power distribution for the entire vehicle by the power battery pack, but also match the current transmission directions among the power battery pack, the battery pack, and the low-voltage power distribution circuit according to the vehicle's power consumption requirements. And through the low-voltage integrated power distribution architecture of the present application, in the case of a failure of the low-voltage battery, the power battery pack or the battery pack in the power battery pack can supply power to the low-voltage power distribution circuit, so as to realize the low-voltage power distribution of the vehicle by reusing the power battery pack, playing the role of low-voltage power distribution redundancy of the vehicle and ensuring the safety of the vehicle's low-voltage power distribution system.

[0045] In some embodiments, the first rectifier-inverter circuit includes at least one bridge arm and a driving module; the driving module includes a high-voltage isolated driving chip, and the driving chip is controlled by the controller to drive the bridge arm.

[0046] In some embodiments, the bridge arm and the driving module are powered by an isolated power supply.

[0047] In the technical solution of the embodiment of the present application, by performing high-voltage isolation on the driving chip, electromagnetic interference from the high voltage input from the high-voltage input end to the driving module can be avoided, the driving module can be prevented from being interfered and mis-started, and the high-voltage insulation withstand voltage requirements can be supported, reducing the electromagnetic interference of the high-frequency switching frequency in the DCDC circuit on the electronic switch in the low-voltage power distribution circuit and improving the safety of the low-voltage power distribution architecture.

[0048] In some embodiments, the DCDC circuit is further configured to perform a voltage boosting process on the voltage output by the low-voltage management circuit to pre-charge a pre-charge capacitor connected to the high-voltage input end.

[0049] In some embodiments, the low-voltage integrated power distribution architecture further includes a vehicle heat dissipation plate; the circuit board is disposed on a first side of the vehicle heat dissipation plate, the low-voltage battery is disposed on a second side of the vehicle heat dissipation plate, the second side of the vehicle heat dissipation plate is opposite to the first side of the vehicle heat dissipation plate, and the vehicle heat dissipation plate is configured to dissipate heat from the circuit board and the low-voltage battery.

[0050] A second aspect of the embodiments of the present application provides an automobile, including: a power battery pack, and the low-voltage integrated power distribution architecture as described in any one of the above embodiments, wherein the power battery pack is connected to the high-voltage input terminal.

[0051] In the technical solution of the embodiments of the present application, the low-voltage integrated power distribution architecture includes a high-voltage input terminal, a DCDC circuit, a low-voltage management circuit, a low-voltage power distribution circuit, and a low-voltage battery. The low-voltage power distribution circuit is configured with a low-voltage power supply terminal for connecting a low-voltage load. One end of the low-voltage power distribution circuit is connected to the low-voltage battery via the low-voltage management circuit, and the other end of the low-voltage power distribution circuit is connected to the high-voltage input terminal via the DCDC circuit. The DCDC circuit, the low-voltage management circuit, and the low-voltage power distribution circuit share the same controller. By integrating the function of managing the working states of the low-voltage management circuit, the low-voltage power distribution circuit, and the DCDC circuit in the controller, the DCDC circuit, the low-voltage management circuit, the low-voltage power distribution circuit, and the low-voltage battery are integrated together, which not only reduces the weight and volume of the power distribution architecture, but also reduces the probability that the parasitic inductance or parasitic capacitance between the DCDC circuit and the low-voltage battery damages the internal circuit of the vehicle.

[0052] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the following specifically describes the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0054] Figure 1 is a first schematic structural diagram of the low-voltage integrated power distribution architecture provided by the embodiments of the present application;

[0055] Figure 2 is a second schematic structural diagram of the low-voltage integrated power distribution architecture provided by the embodiments of the present application;

[0056] Figure 3It is the third structural schematic diagram of the low-voltage integrated power distribution architecture provided by the embodiments of the present application;

[0057] Figure 4 It is the fourth structural schematic diagram of the low-voltage integrated power distribution architecture provided by the embodiments of the present application;

[0058] Figure 5 It is the fifth structural schematic diagram of the low-voltage integrated power distribution architecture provided by the embodiments of the present application;

[0059] Figure 6 It is the sixth structural schematic diagram of the low-voltage integrated power distribution architecture provided by the embodiments of the present application;

[0060] Figure 7 It is the seventh structural schematic diagram of the low-voltage integrated power distribution architecture provided by the embodiments of the present application. Detailed implementation manners

[0061] Next, embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0063] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means more than two unless otherwise specifically defined.

[0064] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase "the second connection port" at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0065] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this text, the character " / " generally represents an "or" relationship between the associated objects before and after.

[0066] In the description of the embodiments of the present application, the term "multiple frames" refers to two or more (including two).

[0067] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present application.

[0068] Inside the vehicle, both the DCDC circuit and the low-voltage battery are single parts. When the overcurrent protection of the low-voltage battery actively shuts off the protection switch, it is equivalent to a load-dump condition. At this time, the cable between the DCDC circuit and the low-voltage battery has the function of inductance, and this cable generates a large potential, posing a risk of overvoltage damage to the devices in the circuit.

[0069] To solve the above technical problems, the embodiments of the present application provide a low-voltage integrated power distribution architecture. Refer to Figure 1 As shown, the low-voltage integrated power distribution architecture in this embodiment includes: a high-voltage input terminal 110, a DCDC circuit 200, a low-voltage management circuit 400, a low-voltage battery 500, a low-voltage power distribution circuit 300, and a controller 600. The low-voltage power distribution circuit 300 is configured with a low-voltage power supply terminal for connecting to a low-voltage load. One end of the low-voltage power distribution circuit 300 is connected to the low-voltage battery 500 via the low-voltage management circuit 400, and the other end of the low-voltage power distribution circuit 300 is connected to the high-voltage input terminal 110 via the DCDC circuit 200. The DCDC circuit 200, the low-voltage management circuit 400, and the low-voltage power distribution circuit 300 share the same controller 600, and the controller 600 integrates the function of managing the working states of the low-voltage management circuit 400, the low-voltage power distribution circuit 300, and the DCDC circuit 200.

[0070] In this embodiment, the low-voltage power distribution circuit 300 is configured with a low-voltage power supply terminal for accessing low-voltage loads. One end of the low-voltage power distribution circuit 300 is connected to the low-voltage battery 500 via the low-voltage management circuit 400, and the other end of the low-voltage power distribution circuit 300 is connected to the high-voltage input terminal 110 via the DCDC circuit 200. The DCDC circuit 200, the low-voltage management circuit 400, and the low-voltage power distribution circuit 300 share the same controller 600. By integrating the function of managing the working states of the low-voltage management circuit 400, the low-voltage power distribution circuit 300, and the DCDC circuit 200 in the controller 600, the DCDC circuit 200, the low-voltage management circuit 400, the low-voltage power distribution circuit 300, and the low-voltage battery 500 are integrated together, which not only reduces the weight and volume of the power distribution architecture, but also reduces the probability of damage to the vehicle's internal circuit caused by the parasitic inductance or parasitic capacitance between the DCDC circuit 200 and the low-voltage battery 500, and reduces the communication time between each module.

[0071] In some embodiments, the high-voltage input terminal 110 can be connected to the power battery pack 700 inside the vehicle, and the power battery pack 700 includes at least two battery units connected in series in sequence.

[0072] In some embodiments, the DCDC circuit 200 is used to convert the high-voltage power input from the high-voltage input terminal 110 into a low-voltage power supply and output it to the low-voltage power distribution circuit 300, or to convert the low-voltage power supply provided by the low-voltage battery 500 into high-voltage power and output it to the high-voltage input terminal 110; the low-voltage management circuit 400 is controlled by the controller 600 and is used to manage the charging and discharging of the low-voltage battery 500.

[0073] In the embodiment of the present application, the DCDC circuit 200 has the function of bidirectional voltage conversion. It can convert the high-voltage power input from the high-voltage input terminal 110 into a low-voltage power supply and output it to the low-voltage power distribution circuit 300 under the control of the controller 600, and can also convert the low-voltage power supply provided by the low-voltage battery 500 into high-voltage power and output it to the high-voltage input terminal 110 under the control of the controller 600, so as to pre-charge the power battery pack connected to the high-voltage input terminal 110. The low-voltage management circuit 400 can manage the charging and discharging of the low-voltage battery 500 under the control of the controller 600. By integrating the DCDC circuit 200 with the low-voltage battery 500 and the low-voltage management circuit 400 together, the probability of damage to the vehicle's internal circuit caused by the parasitic inductance or parasitic capacitance between the DCDC circuit 200 and the low-voltage battery 500 can be reduced, and the communication time between each module can be reduced, so as to achieve the purpose of reducing delay and improving the performance of the vehicle's power distribution architecture.

[0074] In some embodiments, the low-voltage power distribution circuit 300 includes a first energy transmission link, a second energy transmission link, and a third energy transmission link. The first energy transmission link is the energy transmission path from the DCDC circuit 200 to the low-voltage power supply terminal. The second energy transmission link is the energy transmission path from the low-voltage management circuit 400 to the low-voltage power supply terminal. The third energy transmission link is the energy transmission path from the DCDC circuit 200 to the low-voltage battery 500. The DCDC circuit 200, the low-voltage management circuit 400, and the low-voltage power distribution circuit 300 are controlled by the same controller 600 to control the energy transmission directions of the first energy transmission link, the second energy transmission link, and the third energy transmission link.

[0075] In some embodiments, as shown in Figure 2 FIG. [not provided in the original, assumed to be a figure reference], the low-voltage power distribution circuit 300, the low-voltage management circuit 400, and the DCDC circuit 200 are integrated on the same circuit board 100.

[0076] In the embodiments of the present application, the low-voltage power distribution circuit 300, the low-voltage management circuit 400, and the DCDC circuit 200 are integrated on the same circuit board 100, and the DCDC circuit 200, the low-voltage management circuit 400, and the low-voltage power distribution circuit 300 share the same controller 600. By integrating the function of managing the working states of the low-voltage management circuit 400, the low-voltage power distribution circuit 300, and the DCDC circuit 200 in the controller 600, the DCDC circuit 200, the low-voltage management circuit 400, the low-voltage power distribution circuit 300, and the low-voltage battery 500 are integrated together, which not only reduces the weight and volume of the power distribution architecture, but also reduces the probability of damage to the vehicle's internal circuit caused by the parasitic inductance or parasitic capacitance between the DCDC circuit 200 and the low-voltage battery 500, and reduces the communication time between each module.

[0077] In some embodiments, the low-voltage management circuit 400 includes a detection module. The detection module is connected to the controller 600 and is used to detect the electrical parameters of the low-voltage battery 500. The controller 600 is further used to manage the working state of the low-voltage power distribution circuit 300 according to the electrical parameters of the low-voltage battery 500.

[0078] In the embodiments of the present application, the detection module detects the electrical parameters of the low-voltage battery 500, and the controller 600 manages the operating state of the low-voltage power distribution circuit 300 according to the electrical parameters of the low-voltage battery 500. The electrical parameters of the low-voltage battery 500 may include parameters such as the temperature, voltage, current, battery health, and remaining power of the low-voltage battery 500. By comprehensively monitoring the low-voltage battery 500, the output stability of the low-voltage battery 500 is ensured, the stability of the low-voltage power distribution circuit 300 for external power supply is ensured, and the low-voltage power distribution circuit 300 is connected to the high-voltage input end 110 via the DCDC circuit 200. When the low-voltage battery 500 is unstable, the high-voltage power input from the high-voltage input end 110 can be converted into a low-voltage power supply by the DCDC circuit 200 in time to supply power to the low-voltage power distribution circuit 300 of the whole vehicle, playing a redundant role, thereby providing a safe and reliable power supply for the low-voltage loads of the whole vehicle and ensuring the safety of the vehicle low-voltage power distribution system.

[0079] In some embodiments, the detection module is further configured to periodically sample the electrical parameters of the low-voltage battery 500; the controller 600 adjusts the operating states of the DCDC circuit 200 and the low-voltage power distribution circuit 300 according to the electrical parameters of the low-voltage battery 500, so as to adjust the voltage of the low-voltage power supply output from the DCDC circuit 200 to the low-voltage management circuit 400 according to the electrical parameters of the low-voltage battery 500.

[0080] In this embodiment, by periodically sampling the electrical parameters of the low-voltage battery 500, the operating state of the low-voltage battery 500 can be accurately judged, and the output power of the DCDC circuit 200 can be dynamically adjusted according to the charging power or discharging power of the low-voltage battery 500, which is beneficial to improving the service life of the low-voltage battery 500.

[0081] In some embodiments, the sampling period of the detection module is less than 10 microseconds (us).

[0082] In some embodiments, refer to Figure 3 As shown, the low-voltage management circuit 400 further includes a first bidirectional switch module K1 controlled by the controller 600; the first bidirectional switch module K1 is used to manage the charging and discharging process of the low-voltage battery 500 under the control of the controller 600.

[0083] In the embodiments of the present application, the first bidirectional switch module K1 functions as a bidirectional switch. The first bidirectional switch module K1 can be controlled by the controller 600. Through the controller 600, the operating state of the first bidirectional switch module K1 can be controlled, such that the current at the first end of the first bidirectional switch module K1 is output from its second end, while the current at the second end cannot be output through the first end, or the current at the second end of the first bidirectional switch module K1 is output from its first end, while the current at the first end cannot be output through its second end, thereby controlling the charging and discharging processes of the low-voltage battery 500 and realizing the management of the low-voltage battery 500.

[0084] In some embodiments, as shown in Figure 3 the low-voltage battery 500 is electrically connected to the low-voltage power distribution circuit 300 through the first bidirectional switch module K1.

[0085] In this embodiment, the first bidirectional switch module K1 is connected between the low-voltage battery 500 and the low-voltage power distribution circuit 300. The operating state of the first bidirectional switch module K1 can be controlled by the controller 600, such that the current at the first end of the first bidirectional switch module K1 is output from its second end, while the current at the second end cannot be output through the first end, or the current at the second end of the first bidirectional switch module K1 is output from its first end, while the current at the first end cannot be output through its second end, thereby controlling the charging and discharging processes of the low-voltage battery 500 and realizing the management of the low-voltage battery 500.

[0086] In some embodiments, as shown in Figure 3 the low-voltage power distribution circuit 300 further includes: a second bidirectional switch module K2 controlled by the controller 600; the second bidirectional switch module K2 is used to control the connection state between the DCDC circuit 200 and the low-voltage management circuit 400 and control the current direction between the DCDC circuit 200 and the low-voltage management circuit 400.

[0087] In the technical solution of the embodiments of the present application, the second bidirectional switch module K2 functions as a bidirectional switch. The second bidirectional switch module K2 can be controlled by the controller 600. Through the controller 600, the operating state of the second bidirectional switch module K2 can be controlled, thereby controlling the current direction between the DCDC circuit 200 and the low-voltage management circuit 400, achieving the purpose of charging the low-voltage battery 500 from the DCDC circuit 200 via the second bidirectional switch module K2 or pre-charging the power battery pack connected to the high-voltage input terminal 110 from the low-voltage battery 500 via the second bidirectional switch module K2.

[0088] In some embodiments, as shown in Figure 3As shown in the figure, the low-voltage power distribution circuit 300 further includes: a first load switch module 310 controlled by a controller 600; the first load switch module 310 is connected between the first end of the second bidirectional switch module K2 and the first low-voltage load power supply end 121.

[0089] In the embodiment of the present application, the first end of the second bidirectional switch module K2 can be connected to the low-voltage battery 500 via the first bidirectional switch module K1. The first end of the first load switch module 310 is connected to the first end of the second bidirectional switch module K2, and the first end of the first load switch module 310 can also be connected to the low-voltage battery 500 via the first bidirectional switch module K1. In this way, the first load switch module 310 can control the power output of the low-voltage power distribution circuit 300 to the first low-voltage load power supply end 121. The first low-voltage load power supply end 121 can be connected to low-voltage loads related to vehicle driving safety and vehicle starting. Thus, when the first bidirectional switch module K1 is turned on, the low-voltage battery 500 supplies power to the first low-voltage load power supply end 121. The second bidirectional switch module K2 can control the connection state between the DCDC circuit 200 and the first low-voltage load power supply end 121. When the power output of the low-voltage battery 500 is unstable, the controller 600 can control the second bidirectional switch module K2 to supply power to the first low-voltage load power supply end 121 through the DCDC circuit 200 to provide a low-voltage power supply via the second bidirectional switch module K2 and the first load switch module 310, playing a redundant role, thereby providing safe and reliable power supply for the vehicle's low-voltage loads. It can also disconnect the second bidirectional switch module K2 when the DCDC circuit 200 fails, ensuring the safety of the vehicle's low-voltage power distribution system.

[0090] In some embodiments, the first load switch module 310 can be used to control the power output of the low-voltage power distribution circuit 300, and classify and control according to the functions of various loads connected to the first low-voltage load power supply end 121, or classify and control according to the application scenarios of different loads. For example, when the low-voltage battery 500 fails, the low-voltage power supply output by the DCDC circuit 200 is preferentially supplied to functional loads such as the vehicle-mounted controller, vehicle starting, vehicle steering, and vehicle braking.

[0091] In some embodiments, refer to Figure 3 As shown in the figure, the low-voltage power distribution circuit 300 further includes: a second load switch module 320 controlled by a controller 600; the second load switch module 320 is connected between the second end of the second bidirectional switch module K2 and the second low-voltage load power supply end 122.

[0092] In the embodiment of the present application, the first end of the second bidirectional switch module K2 can be connected to the low-voltage battery 500 via the first bidirectional switch module K1. The second end of the second bidirectional switch module K2 is connected to the DCDC circuit 200, and the DCDC circuit 200 is connected to the second low-voltage load power supply end 122 via the second load switch module. The second low-voltage load power supply end 122 can be connected to the comfort loads and entertainment loads inside the vehicle. The first end of the second load switch module 320 can also be connected to the low-voltage battery 500 via the second bidirectional switch module K2 and the first bidirectional switch module K1. At the same time, the DCDC circuit 200 can directly supply power to the second low-voltage load power supply end 122 via the second load switch module 320. In this way, the second load switch module 320 can control the power output of the low-voltage power distribution circuit 300 to the second low-voltage load power supply end 122, so that when the first bidirectional switch module K1 and the second bidirectional switch module K2 are turned on, the low-voltage battery 500 supplies power to the second low-voltage load power supply end 122, or when the power output of the low-voltage battery 500 is unstable, the controller 600 can control the DCDC circuit 200 and the second load switch module 320, and the DCDC circuit 200 provides a low-voltage power supply to supply power to the second low-voltage load power supply end 122 via the second load switch module 320, playing a redundant role, thereby providing safe and reliable power supply for the low-voltage loads of the whole vehicle and ensuring the safety of the vehicle low-voltage power distribution system.

[0093] In some embodiments, the low-voltage integrated power distribution architecture further includes a temperature control pipeline, and a cooling medium is provided in the temperature control pipeline; the temperature control pipeline is used for cooling and heating management of the low-voltage power distribution circuit 300, the low-voltage management circuit 400, and the DCDC circuit 200.

[0094] In this embodiment, the low-voltage power distribution circuit 300, the low-voltage management circuit 400, and the DCDC circuit 200 are integrated on the same circuit board 100. By sharing the same temperature control pipeline for the low-voltage power distribution circuit 300, the low-voltage management circuit 400, and the DCDC circuit 200, the space on the circuit board 100 can be fully utilized for pipeline installation, solving the thermal management problems of the low-voltage battery 500 and the power distribution module, and improving the utilization rate of the internal space of the vehicle.

[0095] In some embodiments, when the vehicle application environment is relatively cold, the temperature of the low-voltage battery 500 is relatively low. At this time, the low-voltage battery 500 does not have the charging ability and needs to be quickly heated. Therefore, the cooling medium can be used through the temperature control pipeline to quickly heat the low-voltage battery 500, perform a hot start on the vehicle, and achieve the stability of the low-voltage power distribution of the vehicle.

[0096] In some embodiments, when the low-voltage battery 500 is in a low-temperature state and its discharge power is small and insufficient to support the power required for all controllers 600 to operate, the vehicle can be powered on with high voltage, and the DCDC circuit 200 can normally output a low-voltage power supply. At this time, the low-voltage power supply output by the DCDC circuit 200 is close to the voltage of the low-voltage battery 500, and no overcurrent situation will occur. Thus, the vehicle can be started without affecting the lifespan of the low-voltage battery 500.

[0097] In some embodiments, the temperature control pipeline can also control the temperature of the power battery pack 700 inside the vehicle. If the power battery pack 700 is in a low-temperature environment, it may affect the power output of the vehicle. At this time, the low-voltage battery 500 is used to start the heating load inside the vehicle via the low-voltage power distribution circuit 300. Then, the temperature control pipeline outputs a cooling medium with a higher temperature to heat the power battery pack 700, which can avoid the risks of dry burning or uneven temperature caused by the heating film inside the vehicle, and improve the stability and safety of the vehicle.

[0098] In some embodiments, as shown in Figure 4 Figure 8, the DCDC circuit 200 includes a multi-winding transformer T0, a first rectifier-inverter circuit 210, and a second rectifier-inverter circuit 220; the first winding of the multi-winding transformer T0 is connected to the high-voltage input terminal 110 via the first rectifier-inverter circuit 210, and the second winding and the third winding of the multi-winding transformer T0 are connected to the low-voltage power distribution circuit 300 via the second rectifier-inverter circuit 220; the second winding and the third winding are connected in parallel.

[0099] In this embodiment, the multi-winding transformer T0 can achieve energy transfer between its first winding and second winding. The first rectifier-inverter circuit 210 and the second rectifier-inverter circuit 220 are both controlled by the controller 600. Under the control of the controller 600, the first rectifier-inverter circuit 210 and the second rectifier-inverter circuit 220 can control the energy transfer direction of the multi-winding transformer T0. In the working mode where the DCDC circuit 200 supplies power to the low-voltage power distribution circuit 300, the controller 600 controls the first rectifier-inverter circuit 210 to convert the high-voltage power input from the high-voltage input terminal 110 into alternating current, and transmit it to the second winding and the third winding via the first winding. At the same time, the controller 600 controls the second rectifier-inverter circuit 220 to convert the alternating current output from the second winding and the third winding into a low-voltage power supply in DC mode and output it to the low-voltage power distribution circuit 300. In the working mode where the low-voltage power distribution circuit 300 pre-charges the high-voltage input terminal 110, the controller 600 controls the second rectifier-inverter circuit 220 to transmit the low-voltage power output from the low-voltage power distribution circuit 300 to the first winding via the second winding and the third winding, and convert the alternating current of the first winding of the multi-winding transformer T0 into direct current through the first rectifier-inverter circuit 210 and output it via the high-voltage input terminal 110. Thus, the current transmission direction between the power battery pack 700 and the low-voltage power distribution circuit 300 can be matched according to the power consumption requirements of the vehicle. The output voltage of the power battery pack 700 can be converted into a low-voltage power supply by the DCDC circuit 200 to supply power to the low-voltage power distribution circuit 300 of the whole vehicle, playing a redundant role and ensuring the safety function of the vehicle's low-voltage power distribution system. It can also realize the function of pre-charging the power battery pack 700 by the low-voltage power distribution circuit 300.

[0100] In some embodiments, as shown in Figure 4 the second winding and the third winding are connected in parallel, and the same-named end of the second winding is connected to the different-named end of the third winding.

[0101] In this embodiment, the operating states of the first rectifier-inverter circuit 210, the second rectifier-inverter circuit 220, and the third rectifier-inverter circuit 230 are controlled by the controller 600. The first rectifier-inverter circuit 210 is connected between the power battery pack 700 and the first winding. The third rectifier-inverter circuit 230 is connected between the battery pack 710 and the second winding. The second rectifier-inverter circuit 220 is connected between the low-voltage power distribution circuit 300 and the second winding and the third winding. This enables the low-voltage power distribution circuit 300 to be connected to both the power battery pack 700 and the battery pack 710 within the power battery pack 700 via the multi-winding integrated transformer T0. By controlling the operating states of the first rectifier-inverter circuit 210, the second rectifier-inverter circuit 220, and the third rectifier-inverter circuit 230 through the controller 600, the primary and secondary settings of the first winding, the second winding, the third winding, and the fourth winding can be determined, thereby adjusting the energy transfer direction between the windings. This can not only achieve the function of providing low-voltage power distribution for the entire vehicle by the power battery pack 700, but also match the current transfer direction among the power battery pack 700, the battery pack 710, and the low-voltage power distribution circuit 300 according to the vehicle's power consumption requirements. With the low-voltage integrated power distribution architecture of this application, the power battery pack 700 or the battery pack within the power battery pack 700 can supply power to the low-voltage power distribution circuit 300 without the participation of the vehicle controller 600. This can not only realize the low-voltage power distribution of the vehicle by reusing the power battery pack 700 in the case of a failure of the low-voltage battery 500, but also simplify the vehicle's power distribution strategy, making the power supply more reliable, further reducing the power of the low-voltage battery 500, and reducing the weight and cost of the vehicle.

[0102] In some embodiments, as shown in Figure 5 the low-voltage integrated power distribution architecture further includes a low-voltage input terminal 120 for accessing the battery pack within the power battery pack 700; the DCDC circuit 200 further includes a third rectifier-inverter circuit 230, and the fourth winding of the multi-winding transformer T0 is connected to the low-voltage input terminal 120 via the third rectifier-inverter circuit 230.

[0103] In the embodiments of the present application, the power battery pack 700 includes at least two battery cells. The battery pack includes some of the battery cells within the power battery pack 700. The operating states of the first rectifier-inverter circuit 210, the second rectifier-inverter circuit 220, and the third rectifier-inverter circuit 230 are controlled by the controller 600. The first rectifier-inverter circuit 210 is connected between the power battery pack 700 and the first winding. The second rectifier-inverter circuit 220 is connected between the low-voltage power distribution circuit 300 and the second winding and the third winding. The third rectifier-inverter circuit 230 is connected between the battery pack and the fourth winding, which enables the low-voltage power distribution circuit 300 to be connected to both the power battery pack 700 and the battery pack within the power battery pack 700 via the multi-winding integrated transformer. By controlling the operating states of the first rectifier-inverter circuit 210, the second rectifier-inverter circuit 220, and the third rectifier-inverter circuit 230 through the controller 600, the primary and secondary settings of the first winding, the second winding, the third winding, and the fourth winding can be determined, thereby adjusting the energy transfer direction between the windings. Not only can the function of providing low-voltage power distribution for the entire vehicle by the power battery pack 700 be realized, but also the current transfer direction among the power battery pack 700, the battery pack, and the low-voltage power distribution circuit 300 can be matched according to the vehicle's power consumption requirements. Through the low-voltage integrated power distribution architecture of the present application, in the case of a failure of the low-voltage battery 500, the power battery pack 700 or the battery pack within the power battery pack 700 can be reused to supply power to the low-voltage power distribution circuit 300, thus playing a redundant role and ensuring the safety of the vehicle's low-voltage power distribution system.

[0104] In some embodiments, the first rectifier-inverter circuit 210 is a half-bridge inverter or a full-bridge inverter.

[0105] In some embodiments, the second rectifier-inverter circuit 220 is a half-bridge inverter or a full-bridge inverter.

[0106] In some embodiments, the third rectifier-inverter circuit 230 is a half-bridge inverter or a full-bridge inverter.

[0107] In the embodiments of the present application, the first rectifier-inverter circuit 210, the second rectifier-inverter circuit 220, and the third rectifier-inverter circuit 230 may be full-bridge rectifier-inverter circuits or half-bridge rectifier-inverter circuits, and the third rectifier-inverter circuit 230 may be a half-bridge rectifier circuit. Controlled by the controller 600, the first rectifier-inverter circuit 210, the second rectifier-inverter circuit 220, and the third rectifier-inverter circuit 230 can convert the direct current output by the power battery pack 700 into alternating current and output it to the first winding. Controlled by the controller 600, the third rectifier-inverter circuit 230 can convert the direct current output by the battery pack into alternating current and output it to the fourth winding, or convert the alternating current inductively output by the fourth winding into direct current and output it to the battery pack. Controlled by the controller 600, the second rectifier-inverter circuit 220 can convert the alternating current inductively output by the second winding and the third winding into direct current and output it to the low-voltage power distribution circuit 300. Both the power battery pack 700 and the battery pack in the power battery pack 700 can supply power to the low-voltage power distribution circuit 300 via the multi-winding integrated transformer. It can not only realize the function of providing low-voltage power distribution for the entire vehicle by the power battery pack 700, but also match the current transmission direction among the power battery pack 700, the battery pack, and the low-voltage power distribution circuit 300 according to the vehicle's power consumption requirements. And through the low-voltage integrated power distribution architecture of the present application, in the case of a failure of the low-voltage battery 500, the power battery pack 700 or the battery pack in the power battery pack 700 can supply power to the low-voltage power distribution circuit 300, so as to realize the low-voltage power distribution of the vehicle by reusing the power battery pack 700, playing the role of low-voltage power distribution redundancy of the vehicle and ensuring the safety of the vehicle's low-voltage power distribution system.

[0108] In some embodiments, by setting the second rectifier-inverter circuit 220 as a half-bridge rectifier circuit, the conversion efficiency of the output current of the second winding and the third winding of the multi-winding integrated transformer T0 can be improved, and it is more suitable for low-voltage and high-current application scenarios.

[0109] In this embodiment, the second rectifier-inverter circuit 220 is controlled by the controller 600 and can convert the alternating current induced by the second winding and the third winding into direct current and output it to the low-voltage power distribution circuit 300. Both the power battery pack 700 and the battery pack 710 in the power battery pack 700 can supply power to the low-voltage power distribution circuit 300 via the multi-winding integrated transformer T0. It can not only realize the function of providing low-voltage power distribution for the entire vehicle by the power battery pack 700, but also match the current transmission direction among the power battery pack 700, the battery pack 710, and the low-voltage power distribution circuit 300 according to the vehicle's power consumption requirements. And through the low-voltage integrated power distribution architecture of the present application, in the case of a failure of the low-voltage battery 500, the power battery pack 700 or the battery pack in the power battery pack 700 can supply power to the low-voltage power distribution circuit 300, so as to realize the low-voltage power distribution of the vehicle by reusing the power battery pack 700, without the need for a large-capacity low-voltage battery 500, reducing the vehicle cost. And by integrating the DCDC circuit 200 with the low-voltage side low-voltage power distribution circuit 300, the signal delay between the controller 600, the DCDC circuit 200, and the low-voltage power distribution circuit 300 can also be reduced, improving the stability of the vehicle.

[0110] In some embodiments, the first rectifier-inverter circuit 210 includes at least one arm and a driving module; the driving module includes a high-voltage isolated driving chip, and the driving chip is controlled by the controller 600 to drive the arm.

[0111] In this embodiment, the driving module can adjust the power output from the DCDC circuit 200 to the low-voltage power distribution circuit 300 by driving the duty cycle and switching frequency of the switches in the arm of the first rectifier-inverter circuit 210.

[0112] In some embodiments, the arm and the driving module are powered by an isolated power supply.

[0113] In the embodiments of the present application, by performing high-voltage isolation on the driving chip, the electromagnetic interference of the high-voltage electricity input from the high-voltage input terminal 110 to the driving module can be avoided, preventing the driving module from being interfered and mis-started, and it can support the high-voltage insulation withstand voltage requirements, reducing the electromagnetic interference of the high-frequency switching frequency in the DCDC circuit 200 on the electronic switches in the low-voltage power distribution circuit 300, improving the safety of the low-voltage power distribution architecture.

[0114] In some embodiments, as shown in Figure 4 a pre-charge capacitor C0 is also connected between the positive and negative poles of the power battery pack 700. The DCDC circuit 200 is also used to boost the voltage output by the low-voltage management circuit 400 to pre-charge the pre-charge capacitor C0 connected to the high-voltage input terminal 110.

[0115] In some embodiments, a DCDC converter is composed of a first rectifier-inverter circuit 210, a second rectifier-inverter circuit 220, a third rectifier-inverter circuit 230, and a multi-winding integrated transformer T0, which can enable a low-voltage battery 500 or a battery pack to pre-charge a power battery pack 700, and eliminate the pre-charge relay and pre-charge resistor in the vehicle power supply architecture, achieving the effect of reducing the cost of the vehicle power supply architecture.

[0116] In this embodiment, the low-voltage distribution circuit 300 is connected to the second winding and the third winding of the multi-winding integrated transformer T0 via the second rectifier-inverter circuit 220230. This not only enables the low-voltage distribution circuit 300 to be connected to both the power battery pack 700 and the battery pack 710 within the power battery pack 700 via the multi-winding integrated transformer T0, but also can achieve a state switching time at the level of 100 microseconds (us) based on a four-winding transformer, and its switching rate is much higher than the switching time at the level of 10 microseconds (us) of a relay.

[0117] In some embodiments, there may be no need to set a resonant inductor between the first winding of the multi-winding integrated transformer T0 and the first rectifier-inverter circuit 210. By controlling the working mode of the second rectifier-inverter circuit 220, the second winding and the third winding of the multi-winding integrated transformer T0 are connected in series, so as to generate leakage inductance in the first winding of the multi-winding integrated transformer T0, thereby replacing the resonant inductor between the first winding of the multi-winding integrated transformer T0 and the first rectifier-inverter circuit 210.

[0118] In some embodiments, there may be no need to set a resonant inductor between the fourth winding of the multi-winding integrated transformer T0 and the third rectifier-inverter circuit 230. By controlling the working mode of the second rectifier-inverter circuit 220, the second winding and the third winding of the multi-winding integrated transformer T0 are connected in series, so as to generate leakage inductance in the fourth winding of the multi-winding integrated transformer T0, thereby replacing the resonant inductor between the second winding of the multi-winding integrated transformer T0 and the second rectifier-inverter circuit 220.

[0119] In some embodiments, referring to Figure 4 As shown, the low-voltage management circuit 400 further includes a first resistor, and the voltage across the first resistor can be used to represent the output current of the low-voltage battery 500. The low-voltage management circuit 400 can output a corresponding detection signal to the controller 600, and the controller 600 adjusts the working state of the low-voltage management circuit 400 according to the detection signal. By accurately understanding the discharge capacity of the low-voltage battery 500, the working state of the DCDC circuit 200 is controlled in the pre-charge mode, so as to realize the adjustment of the boost power of the DCDC circuit 200.

[0120] In some embodiments, referring to Figure 4As shown, the first rectifier-inverter circuit 210 includes a first switching transistor Q1 and a second switching transistor Q2. The first ends of the first switching transistor Q1 and the second switching transistor Q2 are commonly connected to the first end of the first winding. The second end of the first switching transistor Q1 and the second end of the first winding are commonly connected to the positive pole of the high-voltage input terminal 110, and the second end of the second switching transistor Q2 is connected to the negative pole of the high-voltage input terminal 110.

[0121] In some embodiments, referring to Figure 4 As shown, the first rectifier-inverter circuit 210 includes a first switching transistor Q1, a second switching transistor Q2, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. The first ends of the first switching transistor Q1 and the second switching transistor Q2 are commonly connected to the first end of the first winding. The second end of the first switching transistor Q1, the first end of the first capacitor C1, and the second end of the second capacitor C2 are commonly connected to the positive pole of the high-voltage input terminal 110. The second end of the second switching transistor Q2, the first end of the third capacitor C3, and the second end of the first capacitor C1 are commonly connected to the negative pole of the high-voltage input terminal 110. The second end of the second capacitor C2 and the second end of the third capacitor C3 are commonly connected to the first end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is connected to the second end of the first winding.

[0122] In some embodiments, referring to Figure 4 As shown, a current sensor CT1 is further provided between the common node of the first switching transistor Q1 and the second switching transistor Q2 and the first end of the first winding. The current sensor CT1 is used to detect the current flowing through the first winding and output the detection result to the controller 600. The controller 600 controls the switching duty ratio and switching frequency of the first switching transistor Q1 and the second switching transistor Q2 according to the detection result.

[0123] In some embodiments, by adjusting the duty cycles of the first switching transistor Q1 and the second switching transistor Q2, the direct current output by the power battery pack 700 can be converted into alternating current and output to the first winding. The second winding, the third winding, and the fourth winding can all be used as secondary windings to receive induced current. Among them, if the voltage difference between the battery pack 710 and other battery packs in the power battery pack 700 exceeds the threshold voltage, the third rectifier-inverter circuit 230 can convert the alternating current induced by the fourth winding into direct current and output it to the battery pack 710 to balance the battery pack 710. The second rectifier-inverter circuit 220 is controlled by the controller 600 and can convert the alternating current induced by the second winding and the third winding into direct current and output it to the low-voltage power distribution circuit 300. Moreover, both the power battery pack 700 and the battery pack 710 in the power battery pack 700 can supply power to the low-voltage power distribution circuit 300 via the multi-winding integrated transformer T0. It can not only realize the function of providing low-voltage power distribution for the entire vehicle by the power battery pack 700, but also match the current transmission directions among the power battery pack 700, the battery pack 710, and the low-voltage power distribution circuit 300 according to the vehicle's power consumption requirements. And through the low-voltage integrated power distribution architecture of the present application, in the case of a failure of the low-voltage battery 500, the power battery pack 700 or the battery pack in the power battery pack 700 can supply power to the low-voltage power distribution circuit 300, eliminating the need for a large-capacity low-voltage battery 500, reducing the vehicle cost, and also reducing the signal delay between the controller 600 and the DCDC circuit 200 and the low-voltage power distribution circuit 300, improving the stability of the vehicle.

[0124] In some embodiments, referring to Figure 4 As shown, the second rectifier-inverter circuit 220 includes a third switching transistor Q3 and a fourth switching transistor Q4; the first end of the third switching transistor Q3 is connected to the first end of the second winding, the first end of the fourth switching transistor Q4 is connected to the first end of the third winding, the second end of the third switching transistor Q3 and the second end of the fourth switching transistor Q4 are connected to the negative extreme of the low-voltage power distribution circuit 300, and the second end of the second winding and the second end of the third winding are connected to the positive extreme of the low-voltage power distribution circuit 300.

[0125] In this embodiment, the third switching transistor Q3 and the fourth switching transistor Q4 can form a half-bridge rectifier circuit. By adjusting the duty cycle of the switching transistors in the third rectifier-inverter circuit 230, the direct current output by the battery pack 710 can be converted into alternating current and output to the fourth winding, or the direct current can be generated by the induced current of the fourth winding to charge the battery pack 710. Both the second winding and the third winding can be secondary windings to receive the induced current. The third switching transistor Q3 and the fourth switching transistor Q4 are controlled by the controller 600 to convert the alternating current induced and output by the second winding and the third winding into direct current and output it to the low-voltage power distribution circuit 300. Moreover, when the vehicle does not output high-voltage electricity, the first rectifier-inverter circuit 210 does not work. The second rectifier-inverter circuit 220 can supply power to the low-voltage power distribution circuit 300 via the multi-winding integrated transformer T0 with the direct current output by the battery pack 710, so as to provide the function of low-voltage power distribution for the entire vehicle through the energy inside the power battery pack 700. With the low-voltage integrated power distribution architecture of the present application, a large-capacity low-voltage battery 500 is not required, the vehicle cost is reduced, and the signal delay between the controller 600 and the DCDC circuit 200 and the low-voltage power distribution circuit 300 can also be reduced, improving the stability of the vehicle.

[0126] In some embodiments, referring to Figure 4 As shown, the second rectifier-inverter circuit 220 further includes a second inductor L2 and a fifth capacitor C5. A voltage sensor V can also be provided at both ends of the fifth capacitor C5 to detect the voltage of the common node between the second rectifier-inverter circuit 220 and the low-voltage power distribution circuit 300. The second inductor L2 and the fifth capacitor C5 form an LC resonance circuit. In this way, the controller 600 can adjust the low-voltage power supply output by the DCDC circuit 200 according to the detection result of the voltage sensor V, or the boost power of the DCDC circuit 200 can be adjusted by controlling the duty cycles of the third switching transistor Q3 and the fourth switching transistor Q4.

[0127] In some embodiments, referring to Figure 4 As shown, the first load switch module 310 includes a plurality of electronic switches, and the plurality of electronic switches are respectively used to control the power supply states of a plurality of electrical loads.

[0128] In the embodiment of the present application, the plurality of electronic switches are respectively connected to the plurality of loads, and the power supply outputs of the plurality of loads are respectively controlled by the plurality of electronic switches, so that each load can be classified and controlled according to the functions of various loads connected to the low-voltage load port, or each load can be classified and controlled according to the application scenarios of different loads.

[0129] In some embodiments, the first load switch module 310 may include a plurality of electronic switches. Referring to Figure 4As shown, the first load switch module 310 may include a fourth electronic switch T11, a fifth electronic switch T12, and a sixth electronic switch T13. The fourth electronic switch T11, the fifth electronic switch T12, and the sixth electronic switch T13 are connected in parallel, and one end of them is commonly connected to the first end of the second bidirectional switch module K2, and the other ends are respectively connected to a first load, a second load, and a third load connected to the first low-voltage load power supply terminal 121. The first load, the second load, and the third load may be electrical loads of the vehicle internal safety control type, such as function loads of a vehicle head unit controller, lights, steering, brakes, etc.

[0130] In some embodiments, referring to Figure 5 As shown, the second low-voltage load power supply terminal 122 includes a plurality of power supply terminals and can access loads of the vehicle internal comfort type, such as function loads of an in-vehicle air conditioner, seat heating, etc.

[0131] In some embodiments, the second load switch module 320 includes a seventh electronic switch T14, an eighth electronic switch T15, and a ninth electronic switch T16. The seventh electronic switch T14, the eighth electronic switch T15, and the ninth electronic switch T16 are connected in parallel, and one end of them is commonly connected to the second end of the second bidirectional switch module K2, and the other ends are respectively connected to a fourth load, a fifth load, and a sixth load connected to the second low-voltage load power supply terminal 122. The fourth load, the fifth load, and the sixth load may be loads of the vehicle internal comfort type, such as function loads of an in-vehicle air conditioner, seat heating, etc.

[0132] In some specific application embodiments, the low-voltage power distribution part may be provided with multiple electronic switches respectively connected to multiple loads. The multiple loads can be classified into category 1, category 2, and category 3 according to load characteristics. Among them, category 1 includes function loads related to vehicle startup, such as a power management system, a vehicle head unit controller, a domain controller 600, etc.; category 2 includes comfort-related function loads such as a fan, an air conditioner, etc.; category 3 includes loads related to driving safety, such as steering, braking, etc. When the vehicle starts, only the loads in category 1 are started. After the DCDC circuit 200 works normally, the loads in category 2 and category 3 are then turned on. In this way, the power demand for the low-voltage battery 500 (such as a 12V small battery) can be reduced.

[0133] In some embodiments, referring to Figure 4 As shown, the first bidirectional switch module K1 includes a first electronic switch T1 and a second electronic switch T2, and the first electronic switch T1 and the second electronic switch T2 are arranged opposite to each other.

[0134] When the vehicle is started, the first electronic switch T1 and the second electronic switch T2 are turned on, preferentially powering the controllers of the in-vehicle driving safety category, then closing the main positive relay and the main negative relay in the power management circuit, starting the DCDC circuit 200, and then closing all the electronic switches in the first load switch module 310, and the vehicle is powered on successfully.

[0135] In some embodiments, both the first electronic switch T1 and the second electronic switch T2 are MOSFETs, and the sources of the first electronic switch T1 and the second electronic switch T2 are commonly connected, or their drains are commonly connected.

[0136] In some embodiments, after the vehicle is powered on with high voltage, the DCDC circuit 200 operates normally, the first bidirectional switch module K1 is turned off, the low-voltage battery 500 does not need to output current, and the DCDC circuit 200 mainly provides low voltage for all the low-voltage loads connected to the low-voltage power distribution circuit 300.

[0137] In some embodiments, see Figure 4 As shown, the first winding is connected to the first rectifier-inverter circuit 210 via the first resonant inductor unit L1.

[0138] In some embodiments, the first resonant inductor unit L1 includes at least one inductor.

[0139] In this embodiment, the two ends of the first winding of the multi-winding integrated transformer T0 are connected to the positive and negative poles of the power battery pack 700 via the first rectifier-inverter circuit 210, and the two ends of the second winding of the multi-winding integrated transformer T0 are connected to the positive and negative poles of the battery pack 710 via the second rectifier-inverter circuit 220. The second winding and the third winding of the multi-winding integrated transformer T0 are connected to the low-voltage power distribution circuit 300 via the third rectifier-inverter circuit 230. When the power battery pack 700 in the vehicle outputs high voltage, the second winding and the third winding of the multi-winding integrated transformer T0 output low-voltage alternating current, and the corresponding direct current is obtained via the third rectifier-inverter circuit 230 to power the low-voltage power distribution circuit 300.

[0140] In some embodiments, the two ends of the fourth winding of the multi-winding integrated transformer T0 are connected to the positive and negative poles of the battery pack 710 via the third rectifier-inverter circuit 230. The third rectifier-inverter circuit 230 is a smaller power module, and its power can be in the order of hundreds of watts. Before the high voltage output by the power battery pack 700 is powered on, it can not only power the low-voltage power distribution circuit 300 of the vehicle, but also perform pre-charging processing for the closing of the main positive relay K11 of the power battery pack 700.

[0141] When both the power battery pack 700 and the battery pack 710 output electrical energy, before the vehicle is powered on, the battery pack 710 can pre-charge the pre-charge capacitor C0 at both ends of the power battery pack 700. At this time, the voltage and current requirements for each winding of the multi-winding integrated transformer T0 are relatively high. The output current of the battery pack 710 can be controlled in a closed loop to achieve low-voltage constant-voltage output.

[0142] In some embodiments, as shown in Figure 6 Figure 5, the DCDC circuit 200 includes a first DCDC module 240 and a second DCDC module 250. The first DCDC module 240 is connected between the power battery pack 700 and the low-voltage power distribution circuit 300, and the first DCDC module 240 is used to achieve voltage conversion between the power battery pack 700 and the low-voltage power distribution circuit 300; the second DCDC module 250 is connected between the battery pack 710 and the low-voltage power distribution circuit 300, and the second DCDC module 250 is used to isolate the low-voltage power distribution circuit 300, and convert the output voltage of the battery pack 710 into a low-voltage output to the low-voltage power distribution circuit 300. And both the first DCDC module 240 and the second DCDC module 250 are connected to the power input terminal of the low-voltage power distribution circuit 300.

[0143] In this embodiment, the first DCDC module 240 can convert the high-voltage electricity output by the power battery pack 700 into a low-voltage power supply and output it to the low-voltage power distribution circuit 300. The second DCDC module 250 can isolate the low-voltage power distribution circuit 300 and convert the output voltage of the battery pack 710 into a low-voltage output to the low-voltage power distribution circuit 300. In this way, the low-voltage power distribution circuit 300 can be connected to the power battery pack 700 and the battery pack 710 inside the power battery pack 700 via the first DCDC module 240 and the second DCDC module 250 respectively, realizing the function of providing low-voltage power distribution for the entire vehicle by the power battery pack 700. Even if the high-voltage output of the whole vehicle is turned off, the controller 600 can control the second DCDC module 250 to provide low-voltage power distribution for the entire vehicle by the battery pack 710 inside the power battery pack 700, and the current transmission direction between the power battery pack 700, the battery pack 710 and the low-voltage power distribution circuit 300 can be matched according to the power consumption requirements of the vehicle. Through the solution in this embodiment, in the case of a failure of the low-voltage battery 500, the power battery pack 700 or the battery pack 710 inside the power battery pack 700 can supply power to the low-voltage power distribution circuit 300, so as to realize the low-voltage power distribution of the vehicle by reusing the power battery pack 700, without the need for a large-capacity low-voltage battery 500, reducing the vehicle cost, and also reducing the signal delay between the controller 600, the DCDC circuit 200 and the low-voltage power distribution circuit 300, improving the stability of the vehicle.

[0144] In some embodiments, the first DCDC module 240 and the second DCDC module 250 may be bidirectional voltage conversion circuits. Thus, the controller 600 can control the operating states of the first DCDC module 240 and the second DCDC module 250, so as to match the current transmission directions among the power battery pack 700, the battery pack 710, and the low-voltage power distribution circuit 300 according to the vehicle's power consumption requirements. Through the low-voltage integrated power distribution architecture of the present application, in the case of a failure of the low-voltage battery 500, the power battery pack 700 or the battery pack within the power battery pack 700 can supply power to the low-voltage power distribution circuit 300. Thus, the low-voltage power distribution of the vehicle can be realized by reusing the power battery pack 700, without the need for a large-capacity low-voltage battery 500, reducing the vehicle cost. Moreover, the signal delay between the controller 600 and the DCDC circuit 200 and the low-voltage power distribution circuit 300 can also be reduced, improving the stability of the vehicle.

[0145] In some embodiments, the second DCDC module 250 can convert the voltage of the battery pack 710 into a low-voltage power supply and output it to the low-voltage power distribution circuit 300, or receive the voltage input from the low-voltage power distribution circuit 300 and convert it into a suitable charging voltage to charge the battery pack 710.

[0146] In some embodiments, the voltage output from the first DCDC module 240 to the low-voltage power distribution circuit 300 is the same as the output voltage of the battery pack 710.

[0147] In some embodiments, the voltage of the low-voltage power supply output from the first DCDC module 240 and the second DCDC module 250 to the low-voltage power distribution circuit 300 can be 12V or 24V.

[0148] In some embodiments, the controller 600 is further configured to control the first DCDC module 240 to convert the first voltage output from the power battery pack 700 into a low-voltage power supply and charge the battery pack 710 via the low-voltage power distribution circuit 300 and the second DCDC module 250 when the power of the battery pack 710 is less than the first preset power.

[0149] In this embodiment, after the vehicle's high-voltage power-on is completed and it starts to work normally, the first DCDC module 240 outputs a low-voltage power supply to supply power to the low-voltage power distribution circuit 300. At the same time, the second DCDC module 250 uses the low-voltage power supply output from the first DCDC module 240 as an input to charge the battery pack 710 within the power battery pack 700. The battery management system requests voltage and current from the second DCDC module 250 according to the voltage of the battery cells within the power battery pack 700 to achieve the charging and balancing of the battery pack 710 within the power battery pack 700.

[0150] In some embodiments, the controller 600 is further configured to control the second DCDC module 250 to be in a standby state when the first DCDC module 240 converts the first voltage output by the power battery pack 700 into a low-voltage power supply, and control the second DCDC module 250 to convert the second voltage provided by the battery pack 710 into a low-voltage power supply to supply power to the low-voltage power distribution circuit 300 when the required power of the low-voltage power distribution circuit 300 exceeds a preset power threshold.

[0151] In this embodiment, after the vehicle is powered on with high voltage, the first DCDC module 240 operates normally, but the second DCDC module 250 is in a standby state. The first DCDC module 240 mainly provides low-voltage power for all low-voltage loads. When the vehicle is running, the instantaneous power of the low-voltage power distribution circuit 300 exceeds the rated power of the first DCDC module 240, and the output voltage of the low-voltage power distribution circuit 300 drops. For example, when the output voltage of the low-voltage power distribution circuit 300 is lower than the first threshold voltage, the second DCDC module 250 is triggered to start, and the second DCDC module 250 provides the remaining power.

[0152] In some embodiments, if the rated voltage of the low-voltage power distribution circuit 300 is 12V, the first threshold voltage can be 12V - 0.3V = 11.7V.

[0153] In some embodiments, the controller 600 is further configured to control the second DCDC module 250 to be in a standby state when the first DCDC module 240 converts the first voltage output by the power battery pack 700 into a low-voltage power supply, and control the second DCDC module 250 to convert the low-voltage power supply provided by the low-voltage power distribution circuit 300 into a second voltage to charge the battery pack 710 when the required power of the low-voltage power distribution circuit 300 is less than a preset power threshold.

[0154] In this embodiment, after the vehicle is powered on with high voltage, the first DCDC module 240 operates normally, but the second DCDC module 250 is in a standby state. The first DCDC module 240 mainly provides low-voltage power for all low-voltage loads in the vehicle. When the instantaneous voltage of the low-voltage power distribution circuit 300 is higher than the second threshold voltage during vehicle operation, the second DCDC module 250 is triggered to start. The second DCDC module 250 adjusts to take the low-voltage power distribution circuit 300 as the input and the battery pack 710 in the power battery pack 700 as the output, so as to absorb the instantaneous overvoltage of the low-voltage power distribution circuit 300, protect the low-voltage power distribution circuit 300, and achieve the purpose of charging the battery pack 710.

[0155] In some embodiments, the controller 600 is further configured to control the second DCDC module 250 to be in a standby state when the first DCDC module 240 converts the first voltage output by the power battery pack 700 into a low-voltage power supply, and to control the second DCDC module 250 to convert the second voltage provided by the battery pack 710 into a low-voltage power supply to supply power to the low-voltage power distribution circuit 300 when the first DCDC module 240 fails.

[0156] In some embodiments, the controller 600 is further configured to control the second DCDC module 250 to be in a standby state when the first DCDC module 240 converts the first voltage output by the power battery pack 700 into a low-voltage power supply, and to control the second DCDC module 250 to convert the second voltage provided by the battery pack 710 into a low-voltage power supply to supply power to the low-voltage power distribution circuit 300 when the battery management circuit fails.

[0157] In some embodiments, when the vehicle is running normally, when the first DCDC module 240 and the high-voltage circuit (such as relays, high-voltage connectors, non-stop-start battery cells, etc.) fail, the second DCDC module 250 can be quickly started and connected to the low-voltage load circuit, and through the intelligent power distribution of the low-voltage power distribution circuit 300, it only supplies power to the vehicle safety loads, such as braking, steering, warning lights, etc., to ensure the basic steering and safe operation of pulling over for the user.

[0158] In some embodiments, referring to Figure 7 As shown, the low-voltage integrated power distribution architecture further includes a vehicle heat sink 140; the circuit board 100 is disposed on the first side of the vehicle heat sink 140, and the low-voltage battery 500 is disposed on the second side of the vehicle heat sink 140. The second side of the vehicle heat sink 140 is opposite to the first side of the vehicle heat sink 140, and the vehicle heat sink 140 is used to dissipate heat from the circuit board 100 and the low-voltage battery 500.

[0159] In some embodiments, referring to Figure 7 As shown, the low-voltage integrated power distribution architecture further includes a base 131 and a cover 132. The base 131 and the cover 132 form a receiving cavity for receiving the vehicle heat sink 140, the circuit board 100, and the low-voltage battery 500.

[0160] In some embodiments, the controller 600 is further configured to control the DCDC circuit 200 to convert the first voltage output by the power battery pack 700 into a third voltage and output it to the low-voltage power distribution circuit 300 when the low-voltage battery 500 fails. In some application embodiments, the first voltage can be 400V or 800V, and the third voltage can be 12V or 24V.

[0161] In some embodiments, the controller 600 is further configured to control the DCDC circuit 200 to convert the second voltage output by the battery pack 710 into a third voltage and output it to the low-voltage power distribution circuit 300 when a fault occurs in the low-voltage battery 500. In some application embodiments, the second voltage may be 12V, 24V, 36V, or 48V.

[0162] In the embodiments of the present application, through the low-voltage integrated power distribution architecture of the present application, when a fault occurs in the low-voltage battery 500, the power battery pack 700 or the battery pack 710 in the power battery pack 700 can supply power to the low-voltage power distribution circuit 300, so as to realize the low-voltage power distribution of the vehicle by reusing the power battery pack 700, replace the power distribution scheme of two low-voltage small batteries, and achieve the purpose of cost reduction.

[0163] In some embodiments, the controller 600 is further configured to control the operating state of the DCDC circuit 200 to charge the battery pack 710 from the power battery pack 700 when the power of the battery pack 710 is less than a preset value.

[0164] In some embodiments, the controller 600 is further configured to control the DCDC circuit 200 to start when the required power of the low-voltage power supply terminal 120 exceeds a preset power threshold, so as to control the battery pack 710 to supply power to the low-voltage power supply terminal 120.

[0165] In some embodiments, the controller 600 is further configured to control the DCDC circuit 200 to start when the required power of the low-voltage power supply terminal 120 exceeds a preset power threshold, so as to control the power battery pack 700 to supply power to the low-voltage power supply terminal 120.

[0166] In some embodiments, the controller 600 is further configured to control the DCDC circuit 200 to start when the vehicle is in a power-off state and the required power of the low-voltage power supply terminal 120 is less than a preset power threshold, so as to control the battery pack 710 to supply power to the low-voltage power supply terminal 120.

[0167] In some embodiments, the controller 600 is further configured to control the DCDC circuit 200 to start when the vehicle is in a power-off state and the required power of the low-voltage power supply terminal 120 is less than a preset power threshold, so as to control the power battery pack 700 to supply power to the low-voltage power supply terminal 120.

[0168] In some embodiments, the controller 600 is further configured to control the DCDC circuit 200 to start when the vehicle is in a power-off state and the power of the battery pack 710 is less than a preset value, so as to control the power battery pack 700 to charge the battery pack 710.

[0169] In this embodiment, the whole vehicle is in a power-off state. When the power of the battery pack 710 in the power battery pack 700 is low, the high voltage of the whole vehicle is triggered, and the DCDC circuit 200 is started. The first port of the DCDC circuit 200 is used as the input, and the second port and the third port output. The second port charges the battery pack 710. At the same time, the controller 600 starts the balancing strategy to synchronously charge the battery cells in the battery pack 710, and finally approaches other battery cells.

[0170] In some embodiments, the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, and the fourth switching transistor Q4 can be MOSFETs or IGBTs.

[0171] In some embodiments, the controller 600 can detect the output voltage and output current of the power battery pack 700 and the battery pack 710, and adjust the switching frequency or duty cycle of each switching unit according to the detection results, so as to meet the working requirements of the power battery pack 700, the battery pack 710, and the low-voltage power distribution circuit 300. When the power battery pack 700 transfers energy to the battery pack 710 and the low-voltage power distribution circuit 300, or when the battery pack 710 transfers energy to the power battery pack 700 and the low-voltage power distribution circuit 300, a control strategy combining variable-frequency control, phase-shift control, or variable-frequency control and phase-shift control is used to control the switching frequency or duty cycle of each switching unit to adjust the energy conversion efficiency. For example, when the load connected to the low-voltage power distribution circuit 300 increases, the duty cycles of the first switching transistor Q1 and the second switching transistor Q2 can be increased. When the load connected to the low-voltage power distribution circuit 300 decreases, the duty cycles of the first switching transistor Q1 and the second switching transistor Q2 can be decreased. When the controller 600 detects that the current in the primary winding of the multi-winding integrated transformer T0 is greater than the preset threshold current, it indicates that the load connected to the low-voltage power distribution circuit 300 may be overloaded or short-circuited. At this time, the first switching transistor Q1 and the second switching transistor Q2 can be controlled to turn off to achieve overload protection and avoid potential safety hazards to the vehicle.

[0172] In some embodiments, refer to Figure 4 As shown, both ends of the power battery pack 700 are output via the main positive relay K11 and the main negative relay K12 respectively. When the main positive relay K11 and the main negative relay K12 are closed, the power battery pack 700 outputs high voltage. The whole vehicle is powered by the power battery pack 700 in the charging, driving, and parking states. The high-voltage electricity output by the power battery pack 700 is subjected to voltage transformation through the first rectifier-inverter circuit 210, the multi-winding transformer T0, and the second rectifier-inverter circuit 220 in sequence to provide low-voltage power for the low-voltage power distribution circuit 300.

[0173] In some embodiments, refer to Figure 4As shown, a fuse resistor is also provided between the positive electrode of the power battery pack 700 and the main positive relay K11 to prevent the output current of the power battery pack 700 from overloading.

[0174] In some embodiments, the output voltage range of the low-voltage battery 500 is 12V - 72V.

[0175] In some embodiments, the low-voltage battery 500 can be a 12V lithium-ion battery or sodium-ion battery, or other rechargeable batteries.

[0176] In some embodiments, the output voltage range of the battery pack 710 is 12V - 72V.

[0177] In some embodiments, the battery pack 710 includes a 12V lithium-ion battery or sodium-ion battery, or other rechargeable batteries.

[0178] In some embodiments, the battery pack 710 includes a 24V lithium-ion battery or sodium-ion battery, or other rechargeable batteries.

[0179] In some embodiments, the battery pack 710 includes a 48V lithium-ion battery or sodium-ion battery, or other rechargeable batteries.

[0180] In some embodiments, the battery pack 710 includes a 72V lithium-ion battery or sodium-ion battery, or other rechargeable batteries.

[0181] In this embodiment, the low-voltage integrated power distribution architecture in the embodiments of the present application can be applied to new energy vehicles, wherein the output voltage of the battery pack 710 in the power battery pack 700 does not exceed 72V.

[0182] The embodiments of the present application also provide a vehicle management system, which includes the low-voltage integrated power distribution architecture in any one of the above embodiments.

[0183] The embodiments of the present application also provide a vehicle, which includes the low-voltage integrated power distribution architecture in any one of the above embodiments.

[0184] In this embodiment, by integrating the low-voltage integrated power distribution architecture of any one of the above embodiments in the vehicle, the low-voltage battery 500, the DCDC circuit 200, the low-voltage power distribution circuit 300, and the controller 600 can be integrated into one structural member, and the DCDC circuit 200 and the low-voltage power distribution circuit 300 share the same controller 600, optimizing the electrical architecture of the vehicle management system, simplifying the relevant components of the whole vehicle, and greatly reducing the cost of the whole vehicle.

[0185] In this embodiment, the low-voltage power distribution circuit 300 is configured with a low-voltage power supply terminal for connecting to a low-voltage load. One end of the low-voltage power distribution circuit 300 is connected to the low-voltage battery 500 via the low-voltage management circuit 400, and the other end of the low-voltage power distribution circuit 300 is connected to the high-voltage input terminal 110 via the DCDC circuit 200. The DCDC circuit 200, the low-voltage management circuit 400, and the low-voltage power distribution circuit 300 share the same controller 600. By integrating the function of managing the operating states of the low-voltage management circuit 400, the low-voltage power distribution circuit 300, and the DCDC circuit 200 in the controller 600, the DCDC circuit 200, the low-voltage management circuit 400, the low-voltage power distribution circuit 300, and the low-voltage battery 500 are integrated together, which not only reduces the weight and volume of the power distribution architecture but also reduces the probability of damage to the vehicle's internal circuit caused by the parasitic inductance or parasitic capacitance between the DCDC circuit 200 and the low-voltage battery 500.

[0186] Those skilled in the art can clearly understand that for the convenience and brevity of description, only the above division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. In addition, the specific names of the functional units and modules are only for the convenience of mutual distinction and do not limit the protection scope of this application. The specific working process of the units and modules in the above system can refer to the corresponding process in the foregoing method embodiment and will not be elaborated here.

[0187] In the above embodiments, the descriptions of the various embodiments have their own emphases. For parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0188] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the electronic device embodiments described above are only illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be an indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0189] The unit described as a separation component may or may not be physically separated. The component displayed as a unit may or may not be a physical unit, that is, it may be located in one place or may be distributed across multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0190] In addition, each functional unit in various embodiments of the present application may be integrated into one processing unit, may exist separately as individual physical units, or two or more units may be integrated into one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0191] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A low voltage integrated power distribution architecture, characterized in that: include: High voltage input terminal, DCDC circuit, low voltage management circuit, low voltage distribution circuit and low voltage battery; The low-voltage power distribution circuit is provided with a low-voltage power supply terminal for accessing a low-voltage load; One end of the low-voltage power distribution circuit is connected to the low-voltage battery via the low-voltage management circuit; The other end of the low voltage power distribution circuit is connected to the high voltage input end via the DCDC circuit; The DCDC circuit, the low voltage management circuit and the low voltage power distribution circuit share a same controller, and the controller integrates a function of managing the working states of the low voltage management circuit, the low voltage power distribution circuit and the DCDC circuit.

2. The low voltage integrated power distribution architecture according to claim 1, characterized in that: The DCDC circuit is used to convert the high voltage power input from the high voltage input terminal to obtain a low voltage power supply and output it to the low voltage distribution circuit, or to convert the low voltage power supply provided by the low voltage battery into a high voltage power supply and output it to the high voltage input terminal; The low voltage management circuit is controlled by the controller and is used to manage the charging and discharging of the low voltage battery.

3. The low voltage integrated power distribution architecture according to claim 1, characterized in that: The low-voltage power distribution circuit includes a first energy transmission link, a second energy transmission link and a third energy transmission link, the first energy transmission link is an energy transmission path from the DCDC circuit to the low-voltage power supply end, the second energy transmission link is an energy transmission path from the low-voltage management circuit to the low-voltage power supply end, and the third energy transmission link is an energy transmission path from the DCDC circuit to the low-voltage battery; The DCDC circuit, the low voltage management circuit and the low voltage power distribution circuit are controlled by the same controller to control the energy transmission direction of the first energy transmission link, the second energy transmission link and the third energy transmission link.

4. The low voltage integrated power distribution architecture according to claim 3, characterized in that: The low voltage management circuit comprises: A detection module, connected to the controller, for detecting electrical parameters of the low-voltage battery; The controller is also used to manage the working state of the low-voltage power distribution circuit according to the electrical parameters of the low-voltage battery.

5. The low voltage integrated power distribution architecture according to claim 4, characterized in that: The detection module is also used to periodically sample the electrical parameters of the low-voltage battery; The controller adjusts the working states of the DCDC circuit and the low-voltage power distribution circuit according to the electrical parameters of the low-voltage battery, so as to adjust the voltage of the low-voltage power supply output by the DCDC circuit to the low-voltage management circuit according to the electrical parameters of the low-voltage battery.

6. The low voltage integrated power distribution architecture according to claim 3, characterized in that: The low voltage management circuit further includes: a first bidirectional switch module controlled by the controller; The first bidirectional switch module is used to manage the charging and discharging process of the low-voltage battery under the control of the controller.

7. The low voltage integrated power distribution architecture according to claim 6, characterized in that: The low-voltage battery is electrically connected to the low-voltage power distribution circuit via the first bidirectional switch module.

8. The low voltage integrated power distribution architecture according to any one of claims 2 to 7, characterized in that: The low voltage power distribution circuit further comprises: a second bidirectional switch module controlled by the controller; The second bidirectional switch module is used to control the connection state between the DCDC circuit and the low voltage management circuit, and to control the current direction between the DCDC circuit and the low voltage management circuit.

9. The low voltage integrated power distribution architecture according to claim 8, characterized in that: The low voltage power distribution circuit further comprises: a first load switch module controlled by the controller; The first load switch module is connected between the first end of the second bidirectional switch module and the first low-voltage load power supply end.

10. The low voltage integrated power distribution architecture according to claim 8, characterized in that: The low voltage power distribution circuit further comprises: a second load switch module controlled by the controller; The second load switch module is connected between the second end of the second bidirectional switch module and the second low-voltage load power supply end.

11. The low voltage integrated power distribution architecture according to any one of claims 1 to 7, characterized in that: The low-voltage power distribution circuit, the low-voltage management circuit, and the DCDC circuit are integrated on the same circuit board.

12. The low voltage integrated power distribution architecture according to any one of claims 1 to 7, characterized in that: The low voltage integrated power distribution architecture further includes: A temperature control pipeline, wherein a cooling medium is arranged in the temperature control pipeline; the temperature control pipeline is used for cooling and heating management of the low-voltage power distribution circuit, the low-voltage management circuit, and the DCDC circuit.

13. The low voltage integrated power distribution architecture according to any one of claims 1 to 7, characterized in that: The DCDC circuit includes a multi-winding transformer, a first rectifier inverter circuit, and a second rectifier inverter circuit; The first winding of the multi-winding transformer is connected to the high voltage input terminal via the first rectifier inverter circuit, and the second and third windings of the multi-winding transformer are connected to the low voltage distribution circuit via the second rectifier inverter circuit; the second winding and the third winding are connected in parallel.

14. The low voltage integrated power distribution architecture according to claim 13, characterized in that: The low-voltage integrated power distribution architecture further includes a low-voltage input terminal, which is used to connect to a battery pack in a power battery pack; The DCDC circuit further includes a third rectifier-inverter circuit, and the fourth winding of the multi-winding transformer is connected to the low voltage input terminal via the third rectifier-inverter circuit.

15. The low voltage integrated power distribution architecture according to claim 14, characterized in that: The first rectifier-inverter circuit is a half-bridge inverter or a full-bridge inverter; and / or The second rectifier inverter circuit is a half-bridge inverter or a full-bridge inverter; and / or The third rectifier and inverter circuit is a half-bridge inverter or a full-bridge inverter.

16. The low voltage integrated power distribution architecture according to claim 13, characterized in that: The first rectifying and inverting circuit includes at least one bridge arm and a driving module; the driving module includes a high-voltage isolated driving chip, and the driving chip is controlled by the controller to drive the bridge arm.

17. The low voltage integrated power distribution architecture according to claim 16, characterized in that: The bridge arm and the driving module are powered by an isolated power supply.

18. The low voltage integrated power distribution architecture according to any one of claims 1 to 7, characterized in that: The DCDC circuit is also used to boost the voltage output by the low voltage management circuit so as to pre-charge the pre-charge capacitor connected to the high voltage input terminal.

19. The low voltage integrated power distribution architecture according to claim 11, characterized in that: The low-voltage integrated power distribution architecture also includes a vehicle heat sink; the circuit board is arranged on a first side of the vehicle heat sink, and the low-voltage battery is arranged on a second side of the vehicle heat sink, the second side of the vehicle heat sink is opposite to the first side of the vehicle heat sink, and the vehicle heat sink is used to dissipate heat for the circuit board and the low-voltage battery.

20. An automobile, characterized in that: The automobile comprises: a power battery pack; and a low-voltage integrated power distribution architecture as described in any one of claims 1 to 19, wherein the power battery pack is connected to the high-voltage input terminal.

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