Low-voltage integrated power distribution architecture and vehicle

Abstract

A low-voltage integrated power distribution architecture and a vehicle. The low-voltage integrated power distribution architecture comprises a high-voltage input end (110), a DCDC circuit (200), a low-voltage management circuit (400), a low-voltage power distribution circuit (300), and a low-voltage battery (500); the low-voltage power distribution circuit (300) is provided with a low-voltage power supply end (120) for connection to a low-voltage load; one end of the low-voltage power distribution circuit (300) is connected to the low-voltage battery (500) by means of the low-voltage management circuit (400); and the other end of the low-voltage power distribution circuit (300) is connected to a high-voltage input end (110) by means of the DCDC circuit (200). By integrating the DCDC circuit (200), the low-voltage management circuit (400), the low-voltage power distribution circuit (300), and the low-voltage battery (500) together and reusing a same controller (600), the function of managing the low-voltage management circuit (400), the low-voltage power distribution circuit (300), and the DCDC circuit (200) is integrated in the controller (600). The weight and size of the power distribution architecture are reduced, and the probability of parasitic inductance or parasitic capacitance between the DCDC circuit (200) and the low-voltage battery (500) causing damage to circuits in the vehicle is reduced.

Description

Low-voltage integrated power distribution architecture, automobile

[0001] This application is based on the Chinese Patent Application No. 202411064857.X entitled "Low-voltage integrated power distribution architecture, automobile" filed on August 2, 2024 and the Chinese Patent Application No. 202410775819.9 entitled "Low-voltage integrated power distribution architecture, automobile" filed on June 14, 2024, which are incorporated by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of automobiles, in particular to a low-voltage integrated power distribution architecture and an automobile. BACKGROUND

[0003] The existing low-voltage power distribution of a vehicle body usually adopts a discrete low-voltage lithium ion battery technology, and a fuse box product is equipped based on the low-voltage battery to realize primary power distribution of vehicle loads, and then the battery management system manages the low-voltage lithium ion battery. In the vehicle, the DCDC circuit and the low-voltage battery are single parts. When the low-voltage battery overcurrent protection actively turns off the protection switch, it is equivalent to the working condition of throwing the load. At this time, the cable between the DCDC circuit and the low-voltage battery has the effect of inductance. The cable generates a large potential, which has the risk of damaging the devices in the circuit. TECHNICAL PROBLEM

[0004] In view of the above problems, the present 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 architecture has the effect of inductance, and the cable generates a large potential when transmitting high-voltage electricity, which can damage the devices in the circuit. TECHNICAL SOLUTION

[0005] The first aspect of the embodiment of the present application provides a low-voltage integrated power distribution architecture, comprising: a high-voltage input end, a DCDC circuit, a low-voltage management circuit, a low-voltage power distribution circuit, and a low-voltage battery.

[0006] The low-voltage power distribution circuit is configured with a low-voltage power supply end for accessing a low-voltage load;

[0007] One end of the low-voltage power distribution circuit is connected with the low-voltage battery via the low-voltage management circuit;

[0008] The other end of the low-voltage power distribution circuit is connected with the high-voltage input end via the DCDC circuit;

[0009] 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.

[0010] In the technical solution of the embodiment of the application, the low-voltage power distribution circuit is configured with a low-voltage power supply end for connecting a low-voltage load, one end of the low-voltage power distribution circuit is connected with a low-voltage battery via a low-voltage management circuit, and the other end of the low-voltage power distribution circuit is connected with a high-voltage input end via a DCDC circuit, the DCDC circuit, the low-voltage management circuit and the low-voltage power distribution circuit share the same controller, the functions of managing the working states of the low-voltage management circuit, the low-voltage power distribution circuit and the DCDC circuit are integrated in the controller, thereby integrating the DCDC circuit, the low-voltage management circuit, the low-voltage power distribution circuit and the low-voltage battery, reducing the weight and volume of the power distribution architecture, and reducing the probability of damage to the circuits in the vehicle caused by the parasitic inductance or parasitic capacitance between the DCDC circuit and the low-voltage battery, and reducing the communication time between the modules.

[0011] In some embodiments, the DCDC circuit is configured to convert high-voltage power input from the high-voltage input end into low-voltage power output to the low-voltage power distribution circuit, or to convert low-voltage power provided by the low-voltage battery into high-voltage power output to the high-voltage input end.

[0012] The low-voltage management circuit is controlled by the controller to manage the charging and discharging of the low-voltage battery.

[0013] In the technical solution of the embodiment of the application, the DCDC circuit has the function of bidirectional voltage conversion, which can convert high-voltage power input from the high-voltage input end into low-voltage power output to the low-voltage power distribution circuit under the control of the controller, and can also convert low-voltage power provided by the low-voltage battery into high-voltage power output to the high-voltage input end under the control of the controller, thereby pre-charging the power battery pack connected to the high-voltage input end, 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, the low-voltage battery and the low-voltage management circuit together, the probability of damage to the circuits in the vehicle caused by the parasitic inductance or parasitic capacitance between the DCDC circuit and the low-voltage battery can be reduced, and the communication time between the modules can be reduced, thereby achieving the purpose of reducing delay and improving the performance of the power distribution architecture of the vehicle.

[0014] 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 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.

[0015] The DCDC circuit, the low-voltage management circuit and the low-voltage power distribution circuit are controlled by the same controller to control energy transmission directions of the first energy transmission link, the second energy transmission link and the third energy transmission link.

[0016] In some embodiments, the low-voltage management circuit comprises:

[0017] The detection module is connected with the controller and is configured to detect an electrical parameter of the low-voltage battery.

[0018] The controller is further configured to manage an operating state of the low-voltage power distribution circuit according to the electrical parameter of the low-voltage battery.

[0019] In the technical solution of the embodiments of the present application, the detection module detects the electrical parameter of the low-voltage battery, and the controller manages the operating state of the low-voltage power distribution circuit according to the electrical parameter of the low-voltage battery. The electrical parameter of the low-voltage battery can include temperature, voltage, current, battery health, remaining power and other parameters of the low-voltage battery. The comprehensive monitoring of the low-voltage battery ensures the output stability of the low-voltage battery and the stability of the low-voltage power distribution circuit. 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 from the high-voltage input end can be converted into low-voltage power by the DCDC circuit to supply power to the low-voltage power distribution circuit of the whole vehicle, thereby playing a redundant role and providing safe and reliable power supply for the low-voltage load of the whole vehicle, and ensuring the safety of the low-voltage power distribution system of the vehicle.

[0020] In some embodiments, the detection module is further configured to periodically sample the electrical parameter of the low-voltage battery.

[0021] The controller adjusts the operating states of the DCDC circuit and the low-voltage power distribution circuit according to the electrical parameter of the low-voltage battery, so as to adjust the voltage of the low-voltage power output from the DCDC circuit to the low-voltage management circuit according to the electrical parameter of the low-voltage battery.

[0022] In some embodiments, the low-voltage management circuit further comprises a first bidirectional switch module controlled by the controller.

[0023] 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.

[0024] In the technical solution of the embodiment of the application, the first bidirectional switch module has the function of a bidirectional switch, and the first bidirectional switch module can be controlled by the controller. The working state of the first bidirectional switch module can be controlled by the controller, so that the current at the first end of the first bidirectional switch module is output from the second end of the first bidirectional switch module, and the current at the second end of the first bidirectional switch module cannot be output from the first end of the first bidirectional switch module, or the current at the second end of the first bidirectional switch module is output from the first end of the first bidirectional switch module, and the current at the first end of the first bidirectional switch module cannot be output from the second end of the first bidirectional switch module, thereby controlling the charging and discharging process of the low-voltage battery and realizing the management of the low-voltage battery.

[0025] In some embodiments, the low-voltage battery is electrically connected to the low-voltage power distribution circuit through the first bidirectional switch module.

[0026] In some embodiments, the low-voltage power distribution circuit further comprises a second bidirectional switch module controlled by the controller.

[0027] The second bidirectional switch module is configured 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.

[0028] In the technical solution of the embodiment of the application, the second bidirectional switch module has the function of a bidirectional switch, and the second bidirectional switch module can be controlled by the controller. The working state of the second bidirectional switch module can be controlled by the controller, thereby controlling the current direction between the DCDC circuit and the low-voltage management circuit, so as to achieve the purpose of charging the low-voltage battery by the DCDC circuit through the second bidirectional switch module or pre-charging the power battery pack connected to the high-voltage input end by the low-voltage battery through the second bidirectional switch module.

[0029] In some embodiments, the low-voltage power distribution circuit further comprises a first load switch module controlled by the controller.

[0030] 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.

[0031] In the technical scheme of the embodiment, 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 power output of the low-voltage power distribution circuit to the first low-voltage load power supply end can be controlled by the first load switch module. The first low-voltage load power supply end can be connected to the low-voltage load related to vehicle driving safety and vehicle starting. Therefore, the first low-voltage load power supply end is powered by the low-voltage battery when the first bidirectional switch module is turned on. The second bidirectional switch module can control the connection state between the DCDC circuit and the first low-voltage load power supply end. When the power output of the low-voltage battery is unstable, the second bidirectional switch module can be controlled by the controller. The low-voltage power supply provided by the DCDC circuit is used to power the first low-voltage load power supply end via the second bidirectional switch module and the first load switch module. This plays a redundant role, thereby providing safe and reliable power supply for the low-voltage load of the whole vehicle. In addition, the second bidirectional switch module can be disconnected when the DCDC circuit fails, thereby ensuring the safety of the low-voltage power distribution system of the vehicle.

[0032] In some embodiments, the low-voltage power distribution circuit further comprises a second load switch module controlled by the controller.

[0033] 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.

[0034] In the technical scheme of the embodiment, 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 load and entertainment load 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 second low-voltage load power supply end can be directly powered by the DCDC circuit via the second load switch module. In this way, the power output of the low-voltage power distribution circuit to the second low-voltage load power supply end can be controlled by the second load switch module. The second low-voltage load power supply end is powered by the low-voltage battery when the first bidirectional switch module and the second bidirectional switch module are turned on. When the power output of the low-voltage battery is unstable, the DCDC circuit and the second load switch module can be controlled by the controller. The low-voltage power supply provided by the DCDC circuit is used to power the second low-voltage load power supply end via the second load switch module. This plays a redundant role, thereby providing safe and reliable power supply for the low-voltage load of the whole vehicle, and ensuring the safety of the low-voltage power distribution system of the vehicle.

[0035] 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.

[0036] In the technical solution of the embodiments 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. The working states of the low-voltage management circuit, the low-voltage power distribution circuit, and the DCDC circuit are managed by the functions integrated in the controller, so that the DCDC circuit, the low-voltage management circuit, the low-voltage power distribution circuit, and the low-voltage battery are integrated together. This not only reduces the weight and volume of the power distribution architecture, but also reduces the probability of damage to the circuits in the vehicle caused by the parasitic inductance or parasitic capacitance between the DCDC circuit and the low-voltage battery, and reduces the communication time between the modules.

[0037] In some embodiments, the low-voltage integrated power distribution architecture further comprises:

[0038] A temperature control pipeline is provided with a cooling medium; the temperature control pipeline is used to cool and heat manage the low-voltage power distribution circuit, the low-voltage management circuit, and the DCDC circuit.

[0039] In some embodiments, the DCDC circuit comprises a multi-winding transformer, a first rectifier-inverter circuit, and a second rectifier-inverter circuit.

[0040] The first winding of the multi-winding transformer is connected to the high-voltage input end 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 connected in parallel.

[0041] In some embodiments, the low-voltage integrated power distribution architecture further comprises a low-voltage input end for connecting to a battery pack in the power battery pack.

[0042] The DCDC circuit further comprises a third rectifier-inverter circuit, and a fourth winding of the multi-winding transformer is connected to the low-voltage input end via the third rectifier-inverter circuit.

[0043] In the technical solutions of the embodiments of the present application, the power battery pack includes at least two battery units, the battery group includes part of the battery units in the power battery pack, the working states of the first rectifier-inverter circuit, the second rectifier-inverter circuit and the third rectifier-inverter circuit are controlled by the 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, so that the low-voltage power distribution circuit is simultaneously connected to the power battery pack and the battery group in the power battery pack through the multi-winding integrated transformer. The working states of the first rectifier-inverter circuit, the second rectifier-inverter circuit and the third rectifier-inverter circuit are controlled by the controller, so that the primary side and the secondary side of the first winding, the second winding, the third winding and the fourth winding can be determined, thereby adjusting the energy transmission direction between the windings. Not only the function of providing low-voltage power distribution for the whole vehicle by the power battery pack can be realized, but also the current transmission direction between the power battery pack, the battery group and the low-voltage power distribution circuit can be matched according to the vehicle power demand. Through the low-voltage integrated power distribution architecture of the present application, in the case of low-voltage battery failure, 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, thereby playing a redundant role and ensuring the safety of the vehicle low-voltage power distribution system.

[0044] 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.

[0045] In the technical solution of the embodiment of the application, the first rectification inversion circuit, the second rectification inversion circuit and the third rectification inversion circuit can be full-bridge rectification inversion circuits or half-bridge rectification inversion circuits, and the third rectification inversion circuit can be a half-bridge rectification circuit. The first rectification inversion circuit, the second rectification inversion circuit and the third rectification inversion circuit controlled by the controller can convert the direct current output by the power battery pack into alternating current and output to the first winding, and the third rectification inversion circuit controlled by the controller can convert the direct current output by the battery pack into alternating current and output to the fourth winding, or convert the alternating current induced by the fourth winding into direct current and output to the battery pack. The second rectification inversion circuit controlled by the controller can convert the alternating current induced by the second winding and the third winding into direct current and output to the low-voltage power distribution circuit, and the power battery pack and the battery pack in the power battery pack can supply power to the low-voltage power distribution circuit through the multi-winding integrated transformer. Not only can the power battery pack provide low-voltage power distribution for the whole vehicle, but also the current transmission direction among the power battery pack, the battery pack and the low-voltage power distribution circuit can be matched according to the power demand of the vehicle. In the case of low-voltage battery failure, 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 multiplexing the power battery pack, and play the role of low-voltage power distribution redundancy of the vehicle, thereby ensuring the safety of the low-voltage power distribution system of the vehicle.

[0046] In some embodiments, the first rectification inversion circuit comprises at least one bridge arm and a driving module; the driving module comprises a high-voltage isolated driving chip controlled by the controller to drive the bridge arm.

[0047] In some embodiments, the bridge arm and the driving module are powered by an isolated power supply.

[0048] In the technical solution of the embodiment of the application, the high-voltage isolation of the driving chip can avoid the electromagnetic interference of the high-voltage input end on the driving module, avoid the misstart of the driving module caused by the interference, support the high-voltage insulation voltage requirement, reduce 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 improve the safety of the low-voltage power distribution architecture.

[0049] In some embodiments, the DCDC circuit is further configured to perform voltage boosting on the voltage output by the low-voltage management circuit to precharge a precharge capacitor connected to the high-voltage input end.

[0050] In some embodiments, the low-voltage integrated power distribution architecture further comprises a vehicle heat sink; the circuit board is disposed on a first side of the vehicle heat sink, the low-voltage battery is disposed 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 for dissipating heat of the circuit board and the low-voltage battery.

[0051] The second aspect of the embodiments of the present application provides an automobile, comprising: a power battery pack and the low-voltage integrated power distribution architecture according to any one of the above embodiments, wherein the power battery pack is connected to the high-voltage input end.

[0052] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. Advantages

[0053] In the technical solutions of the embodiments of the present application, the low-voltage integrated power distribution architecture comprises a high-voltage input end, 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 end for connecting a low-voltage load, one end of the low-voltage power distribution circuit is connected to the low-voltage battery through the low-voltage management circuit, the other end of the low-voltage power distribution circuit is connected to the high-voltage input end through the DCDC circuit, the DCDC circuit, the low-voltage management circuit, and the low-voltage power distribution circuit share the same controller, the working states of the low-voltage management circuit, the low-voltage power distribution circuit, and the DCDC circuit are managed by integrating the functions of the controller, thereby integrating the DCDC circuit, the low-voltage management circuit, the low-voltage power distribution circuit, and the low-voltage battery, which not only reduces the weight and volume of the power distribution architecture, but also reduces the probability of damage to the circuit in the vehicle caused by the parasitic inductance or parasitic capacitance between the DCDC circuit and the low-voltage battery. BRIEF DESCRIPTION OF DRAWINGS

[0054] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for purposes of illustration only and are not considered a limitation of the present application. Moreover, in the drawings, like reference numerals designate identical parts throughout the various drawings. In the drawings:

[0055] FIG. 1 is a first structure schematic diagram of a low-voltage integrated power distribution architecture provided by the embodiments of the present application;

[0056] FIG. 2 is a second structure schematic diagram of a low-voltage integrated power distribution architecture provided by the embodiments of the present application;

[0057] FIG. 3 is a third structure schematic diagram of a low-voltage integrated power distribution architecture provided by the embodiments of the present application;

[0058] Fig. 4 is a fourth structural schematic diagram of the low-voltage integrated power distribution architecture provided by the embodiments of the present application;

[0059] Fig. 5 is a fifth structural schematic diagram of the low-voltage integrated power distribution architecture provided by the embodiments of the present application;

[0060] Fig. 6 is a sixth structural schematic diagram of the low-voltage integrated power distribution architecture provided by the embodiments of the present application;

[0061] Fig. 7 is a seventh structural schematic diagram of the low-voltage integrated power distribution architecture provided by the embodiments of the present application. Embodiments of the present application

[0062] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0064] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly and specifically limited.

[0065] In this paper, the reference to "embodiments" means that the specific features, structures or properties described in conjunction with the embodiments can be included in at least one embodiment of the present application. The phrase does not necessarily refer to the same embodiment at various places in the specification, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0066] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0067] In the description of the embodiments of the present application, the term "multi-frame" refers to two or more (including two).

[0068] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0069] In the vehicle interior, the DCDC circuit and the low-voltage battery are both single parts, and when the low-voltage battery overcurrent protection actively turns off the protection switch, it is equivalent to the working condition of throwing the load. At this time, the cable between the DCDC circuit and the low-voltage battery has the effect of inductance, and the cable generates a large potential, which has the risk of damaging the devices in the circuit.

[0070] In order to solve the above technical problems, the embodiments of the present application provide a low-voltage integrated power distribution architecture, as shown in FIG. 1, the low-voltage integrated power distribution architecture in the embodiments includes: a high-voltage input end 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 to access a low-voltage load, one end of the low-voltage power distribution circuit 300 is connected to the low-voltage battery 500 through 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 end 110 through 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 functions of managing the working states of the low-voltage management circuit 400, the low-voltage power distribution circuit 300, and the DCDC circuit 200.

[0071] In the embodiment, the low-voltage power distribution circuit 300 is configured with a low-voltage power supply end for accessing a low-voltage load, one end of the low-voltage power distribution circuit 300 is connected with 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 with the high-voltage input end 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 functions 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 circuits in the vehicle 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 the modules.

[0072] In some embodiments, the high-voltage input end 110 can access a power battery pack 700 inside the vehicle, and the power battery pack 700 includes at least two battery cells connected in series.

[0073] In some embodiments, the DCDC circuit 200 is configured to convert the high-voltage power input from the high-voltage input end 110 into low-voltage power output to the low-voltage power distribution circuit 300, or to convert the low-voltage power provided by the low-voltage battery 500 into high-voltage power output to the high-voltage input end 110; and the low-voltage management circuit 400 is controlled by the controller 600 to manage the charging and discharging of the low-voltage battery 500.

[0074] In the embodiment, the DCDC circuit 200 has the function of bidirectional voltage conversion, which can convert the high-voltage power input from the high-voltage input end 110 into low-voltage power output to the low-voltage power distribution circuit 300 under the control of the controller 600, or convert the low-voltage power provided by the low-voltage battery 500 into high-voltage power output to the high-voltage input end 110 under the control of the controller 600, thereby pre-charging the power battery pack accessed by the high-voltage input end 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, the probability of damage to the circuits in the vehicle 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 the modules can be reduced, thereby achieving the purpose of reducing delay and improving the performance of the power distribution architecture of the vehicle.

[0075] In some embodiments, the low-voltage power distribution circuit 300 comprises a first energy transmission link, a second energy transmission link and a third energy transmission link, the first energy transmission link being an energy transmission path from the DC / DC circuit 200 to the low-voltage power supply end, the second energy transmission link being an energy transmission path from the low-voltage management circuit 400 to the low-voltage power supply end, and the third energy transmission link being an energy transmission path from the DC / DC circuit 200 to the low-voltage battery 500; the DC / DC 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.

[0076] In some embodiments, referring to FIG. 2, the low-voltage power distribution circuit 300, the low-voltage management circuit 400 and the DC / DC circuit 200 are integrated on the same circuit board 100.

[0077] In the embodiments of the present application, the low-voltage power distribution circuit 300, the low-voltage management circuit 400 and the DC / DC circuit 200 are integrated on the same circuit board 100, and the DC / DC circuit 200, the low-voltage management circuit 400 and the low-voltage power distribution circuit 300 share the same controller 600, which integrates the functions of managing the working states of the low-voltage management circuit 400, the low-voltage power distribution circuit 300 and the DC / DC circuit 200 in the controller 600, thereby integrating the DC / DC circuit 200, the low-voltage management circuit 400, the low-voltage power distribution circuit 300 and the low-voltage battery 500, which not only reduces the weight and volume of the power distribution architecture, but also reduces the probability of damage to the circuits in the vehicle caused by the parasitic inductance or parasitic capacitance between the DC / DC circuit 200 and the low-voltage battery 500, and reduces the communication time between the modules.

[0078] In some embodiments, the low-voltage management circuit 400 comprises a detection module connected to the controller 600, the detection module being configured to detect the electrical parameters of the low-voltage battery 500; and the controller 600 is further configured to manage the working state of the low-voltage power distribution circuit 300 according to the electrical parameters of the low-voltage battery 500.

[0079] In the embodiment of the present application, the detection module detects the electrical parameters of the low-voltage battery 500, and the controller 600 manages the working 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 can include the temperature, voltage, current, battery health, and remaining capacity of the low-voltage battery 500. The comprehensive monitoring of the low-voltage battery 500 ensures the stability of the output of the low-voltage battery 500 and the stability of the power supply of the low-voltage power distribution circuit 300. The low-voltage power distribution circuit 300 is connected to the high-voltage input end 110 through the DCDC circuit 200. When the low-voltage battery 500 is unstable, the high-voltage power from the high-voltage input end 110 can be converted into low-voltage power by the DCDC circuit 200 to supply power to the low-voltage power distribution circuit 300 of the whole vehicle, thereby playing a redundant role and providing safe and reliable power supply for the low-voltage load of the whole vehicle, ensuring the safety of the low-voltage power distribution system of the vehicle.

[0080] In some embodiments, the detection module is also used to periodically sample the electrical parameters of the low-voltage battery 500; the controller 600 adjusts the working state 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 supplied by the DCDC circuit 200 to the low-voltage management circuit 400 according to the electrical parameters of the low-voltage battery 500.

[0081] In the embodiment, by periodically sampling the electrical parameters of the low-voltage battery 500, the working 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.

[0082] In some embodiments, the sampling period of the detection module is less than 10 microseconds (us).

[0083] In some embodiments, referring to FIG. 3, 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.

[0084] In the embodiment of the present application, the first bidirectional switch module K1 has the function of a bidirectional switch. The first bidirectional switch module K1 can be controlled by the controller 600. The working state of the first bidirectional switch module K1 can be controlled by the controller 600, so that the current at the first end of the first bidirectional switch module K1 is output from the second end, and the current at the second end cannot be output from the first end, or the current at the second end of the first bidirectional switch module K1 is output from the first end, and the current at the first end cannot be output from the second end, thereby controlling the charging and discharging process of the low-voltage battery 500 and realizing the management of the low-voltage battery 500.

[0085] In some embodiments, referring to FIG. 3, the low-voltage battery 500 is electrically connected with the low-voltage power distribution circuit 300 through the first bidirectional switch module K1.

[0086] In the embodiment, the first bidirectional switch module K1 is connected between the low-voltage battery 500 and the low-voltage power distribution circuit 300. The working state of the first bidirectional switch module K1 can be controlled by the controller 600, so that the current at the first end of the first bidirectional switch module K1 is output from the second end, and the current at the second end cannot be output from the first end, or the current at the second end of the first bidirectional switch module K1 is output from the first end, and the current at the first end cannot be output from the second end, thereby controlling the charging and discharging process of the low-voltage battery 500 and achieving the management of the low-voltage battery 500.

[0087] In some embodiments, referring to FIG. 3, the low-voltage power distribution circuit 300 further comprises 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.

[0088] In the technical solution of the embodiment, the second bidirectional switch module K2 has the function of a bidirectional switch. The second bidirectional switch module K2 can be controlled by the controller 600, and the working state of the second bidirectional switch module K2 can be controlled by the controller 600, 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 by the DCDC circuit 200 through the second bidirectional switch module K2 or pre-charging the power battery pack connected to the high-voltage input end 110 by the low-voltage battery 500 through the second bidirectional switch module K2.

[0089] In some embodiments, referring to FIG. 3, the low-voltage power distribution circuit 300 further comprises a first load switch module 310 controlled by the 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.

[0090] In the embodiments 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, so that the power output of the low-voltage power distribution circuit 300 to the first low-voltage load power supply end 121 can be controlled by the first load switch module 310, the first low-voltage load power supply end 121 can access the low-voltage loads related to vehicle driving safety and vehicle starting, so that the first low-voltage load power supply end 121 is powered by the low-voltage battery 500 when the first bidirectional switch module K1 is turned on, 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, and in the case that the power output of the low-voltage battery 500 is unstable, the second bidirectional switch module K2 can be controlled by the controller 600 to supply low-voltage power to the first low-voltage load power supply end 121 via the second bidirectional switch module K2 and the first load switch module 310 through the DCDC circuit 200, thereby playing a redundant role and providing safe and reliable power supply for the entire vehicle low-voltage load, and the second bidirectional switch module K2 can be disconnected in the case of DCDC circuit 200 failure, thereby ensuring the safety of the vehicle low-voltage power distribution system.

[0091] 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 can be controlled according to the functions of various loads connected to the first low-voltage load power supply end 121, or can be controlled according to the application scenarios of different loads. For example, in the case of low-voltage battery 500 failure, the low-voltage power output by the DCDC circuit 200 is preferentially supplied to the function loads such as vehicle controller, vehicle starting, vehicle steering, vehicle braking, etc.

[0092] In some embodiments, referring to FIG. 3, the low-voltage power distribution circuit 300 further comprises a second load switch module 320 controlled by the controller 600, and 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.

[0093] In the embodiment, the first end of the second bidirectional switch module K2 is 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 comfort loads and entertainment loads in the vehicle interior. 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, and the second low-voltage load power supply end 122 can be directly powered by the DCDC circuit 200 via the second load switch module 320. In this way, the power output of the low-voltage power distribution circuit 300 to the second low-voltage load power supply end 122 can be controlled by the second load switch module 320, so that the second low-voltage load power supply end 122 is powered by the low-voltage battery 500 when the first bidirectional switch module K1 and the second bidirectional switch module K2 are turned on, or when the power output of the low-voltage battery 500 is unstable, the DCDC circuit 200 and the second load switch module 320 can be controlled by the controller 600 to provide low-voltage power to the second low-voltage load power supply end 122 via the second load switch module 320 by the DCDC circuit 200, thereby playing a redundant role and providing safe and reliable power supply for the entire vehicle low-voltage load, thereby ensuring the safety of the vehicle low-voltage power distribution system.

[0094] In some embodiments, the low-voltage integrated power distribution architecture further includes a temperature control pipeline, and 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 300, the low-voltage management circuit 400, and the DCDC circuit 200.

[0095] In the 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, and the low-voltage power distribution circuit 300, the low-voltage management circuit 400, and the DCDC circuit 200 can share the same temperature control pipeline, so that the space on the circuit board 100 can be fully utilized for pipeline arrangement, the problem of thermal management of the low-voltage battery 500 and the power distribution module is solved, and the utilization rate of the interior space of the vehicle is improved.

[0096] In some embodiments, in the case of a relatively cold vehicle application environment, the temperature of the low-voltage battery 500 is relatively low, the low-voltage battery 500 does not have charging capability at this time, and needs to be quickly heated. Therefore, the cooling medium in the temperature control pipeline can quickly heat the low-voltage battery 500, and the vehicle can be started by heating, thereby realizing the stability of the low-voltage power distribution of the vehicle.

[0097] In some embodiments, the low-voltage battery 500 is in a low-temperature state, and its discharge power is small and insufficient to support the power of all controllers 600 when operating, and the vehicle can be started by high-voltage power-on and normal output of the low-voltage power supply by the DCDC circuit 200. 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 condition occurs, so that the vehicle can be started without affecting the service life of the low-voltage battery 500.

[0098] 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 heating load inside the vehicle is started by the low-voltage battery 500 through the low-voltage power distribution circuit 300, so that the cooling medium with a higher temperature output by the temperature control pipeline can heat the power battery pack 700, which can avoid the risk of dry burning or uneven temperature caused by the heating film inside the vehicle, and improve the stability and safety of the vehicle.

[0099] In some embodiments, referring to FIG. 4, 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 end 110 through 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 through the second rectifier-inverter circuit 220. The second winding and the third winding are connected in parallel.

[0100] In the embodiment, the multi-winding transformer T0 can realize energy transmission between the first winding and the second winding, and the first rectification inversion circuit 210 and the second rectification inversion circuit 220 are controlled by the controller 600. Under the control of the controller 600, the first rectification inversion circuit 210 and the second rectification inversion circuit 220 can control the energy transmission direction of the multi-winding transformer T0. In the working mode of the DCDC circuit 200 supplying power to the low-voltage power distribution circuit 300, the controller 600 controls the first rectification inversion circuit 210 to convert the high-voltage power input from the high-voltage input end 110 into alternating current, and transmits the alternating current to the second winding and the third winding through the first winding, and controls the second rectification inversion circuit 220 to convert the alternating current output from the second winding and the third winding into a low-voltage power supply in a direct current mode and output to the low-voltage power distribution circuit 300. In the working mode of the low-voltage power distribution circuit 300 pre-charging the high-voltage input end 110, the controller 600 controls the second rectification inversion circuit 220 to transmit the low-voltage power output from the low-voltage power distribution circuit 300 to the first winding through the second winding and the third winding, and converts the alternating current of the first winding of the multi-winding transformer T0 into direct current through the first rectification inversion circuit 210 and outputs through the high-voltage input end 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 demand of the vehicle. The output voltage of the power battery pack 700 can be converted into a low-voltage power supply through the DCDC circuit 200 to supply power to the low-voltage power distribution circuit 300 of the whole vehicle, which plays a redundant role and ensures the safety function of the low-voltage power distribution system of the vehicle. The low-voltage power distribution circuit 300 can also realize the function of pre-charging the power battery pack 700.

[0101] In some embodiments, referring to FIG. 4, the second winding and the third winding are connected in parallel, and the same name end of the second winding is connected to the different name end of the third winding.

[0102] In the embodiment, the working states of the first rectification inversion circuit 210, the second rectification inversion circuit 220, and the third rectification inversion circuit 230 are controlled by the controller 600, the first rectification inversion circuit 210 is connected between the power battery pack 700 and the first winding, the third rectification inversion circuit 230 is connected between the battery pack 710 and the second winding, and the second rectification inversion circuit 220 is connected between the low-voltage power distribution circuit 300 and the second winding and the third winding, so that the low-voltage power distribution circuit 300 is simultaneously connected to the power battery pack 700 and the battery pack 710 in the power battery pack 700 via the multi-winding integrated transformer T0, and the working states of the first rectification inversion circuit 210, the second rectification inversion circuit 220, and the third rectification inversion circuit 230 are controlled by the controller 600, so that the primary side and the secondary side of the first winding, the second winding, the third winding, and the fourth winding are determined, the energy transmission direction between the windings is adjusted, the function of providing low-voltage power distribution for the whole vehicle by the power battery pack 700 is realized, and the current transmission direction among the power battery pack 700, the battery pack 710, and the low-voltage power distribution circuit 300 is matched according to the vehicle power demand. According to the low-voltage integrated power distribution architecture, 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 without the participation of the vehicle controller 600, the low-voltage power distribution of the vehicle can be realized by multiplexing the power battery pack 700 in the case of failure of the low-voltage battery 500, the vehicle power distribution strategy is simplified, the power supply is more reliable, the power of the low-voltage battery 500 can be further reduced, and the weight and cost of the vehicle can be reduced.

[0103] In some embodiments, referring to FIG. 5, the low-voltage integrated power distribution architecture further includes a low-voltage input end 120 for connecting to the battery pack in the power battery pack 700, and the DCDC circuit 200 further includes a third rectification inversion circuit 230, and the fourth winding of the multi-winding transformer T0 is connected to the low-voltage input end 120 via the third rectification inversion circuit 230.

[0104] In the embodiments of the present application, the power battery pack 700 includes at least two battery cells, the battery pack includes part of the battery cells in the power battery pack 700, the working 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, and the third rectifier-inverter circuit 230 is connected between the battery pack and the fourth winding, so that the low-voltage power distribution circuit 300 can be simultaneously connected to the power battery pack 700 and the battery pack in the power battery pack 700 via the multi-winding integrated transformer. By controlling the working states of the first rectifier-inverter circuit 210, the second rectifier-inverter circuit 220 and the third rectifier-inverter circuit 230 by the controller 600, the primary side and the secondary side of the first winding, the second winding, the third winding and the fourth winding can be determined, so as to adjust the energy transmission direction between the windings. Not only the function of providing low-voltage power distribution for the whole vehicle by the power battery pack 700 can be realized, but also the current transmission direction between the power battery pack 700, the battery pack and the low-voltage power distribution circuit 300 can be matched according to the vehicle power demand. Through the low-voltage integrated power distribution architecture of the present application, in the case of failure of the low-voltage battery 500, the power battery pack 700 or the battery pack in the power battery pack 700 can be reused to supply power to the low-voltage power distribution circuit 300, so as to play a redundant role and ensure the safety of the vehicle low-voltage power distribution system.

[0105] In some embodiments, the first rectifier-inverter circuit 210 is a half-bridge inverter or a full-bridge inverter.

[0106] In some embodiments, the second rectifier-inverter circuit 220 is a half-bridge inverter or a full-bridge inverter.

[0107] In some embodiments, the third rectifier-inverter circuit 230 is a half-bridge inverter or a full-bridge inverter.

[0108] In the embodiments of the present application, the first rectification inversion circuit 210, the second rectification inversion circuit 220, and the third rectification inversion circuit 230 can be full-bridge rectification inversion circuits or half-bridge rectification inversion circuits, and the third rectification inversion circuit 230 can be a half-bridge rectification circuit. The first rectification inversion circuit 210, the second rectification inversion circuit 220, and the third rectification inversion circuit 230 controlled by the controller 600 can convert the direct current output by the power battery pack 700 into alternating current and output to the first winding, and the third rectification inversion circuit 230 controlled by the controller 600 can convert the direct current output by the battery pack into alternating current and output to the fourth winding, or convert the alternating current induced by the fourth winding into direct current and output to the battery pack. The second rectification inversion circuit 220 controlled by the controller 600 can convert the alternating current induced by the second winding and the third winding into direct current and output to the low-voltage power distribution circuit 300. 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. Not only can the power battery pack 700 provide low-voltage power distribution for the entire vehicle, but also can match the current transmission direction between the power battery pack 700, the battery pack, and the low-voltage power distribution circuit 300 according to the vehicle power demand. In the case of 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 multiplexing the power battery pack 700, and play the role of low-voltage power distribution redundancy of the vehicle, thereby ensuring the safety of the vehicle low-voltage power distribution system.

[0109] In some embodiments, by setting the second rectification inversion circuit 220 as a half-bridge rectification circuit, the conversion efficiency 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 large-current application scenarios.

[0110] In the embodiment, the second rectification inversion circuit 220 controlled by the controller 600 can convert the alternating current output by the second winding and the third winding into direct current and output to the low-voltage power distribution circuit 300. 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. Not only can the power battery pack 700 provide low-voltage power distribution for the whole vehicle, but also the current transmission direction among the power battery pack 700, the battery pack 710, and the low-voltage power distribution circuit 300 can be matched according to the power demand of the vehicle. In the case of 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 of a large-capacity low-voltage battery 500, thereby reducing the cost of the vehicle. In addition, by integrating the DCDC circuit 200 and the low-voltage power distribution circuit 300 on the low-voltage side, the signal delay between the controller 600 and the DCDC circuit 200 and the low-voltage power distribution circuit 300 can be reduced, and the stability of the vehicle can be improved.

[0111] In some embodiments, the first rectification inversion circuit 210 includes at least one bridge arm and a driving module. The driving module includes a high-voltage isolated driving chip controlled by the controller 600 to drive the bridge arm.

[0112] In the embodiment, the driving module can adjust the power output by the DCDC circuit 200 to the low-voltage power distribution circuit 300 by driving the switching duty ratio and the switching frequency of the bridge arm in the first rectification inversion circuit 210.

[0113] In some embodiments, the bridge arm and the driving module are powered by an isolated power supply.

[0114] In the embodiment, by high-voltage isolation of the driving chip, the electromagnetic interference of the high-voltage input end 110 to the driving module can be avoided, the driving module can be prevented from being interfered to cause misstart, the high-voltage insulation voltage requirement can be supported, the electromagnetic interference of the high-frequency switching frequency in the DCDC circuit 200 to the electronic switch in the low-voltage power distribution circuit 300 can be reduced, and the safety of the low-voltage power distribution architecture can be improved.

[0115] In some embodiments, as shown in FIG. 4, a pre-charge capacitor C0 is further connected between the positive electrode and the negative electrode of the power battery pack 700. The DCDC circuit 200 is further configured to perform voltage boosting on the voltage output by the low-voltage management circuit 400, so as to pre-charge the pre-charge capacitor C0 connected with the high-voltage input end 110.

[0116] In some embodiments, the DCDC converter composed of the first rectification inversion circuit 210, the second rectification inversion circuit 220, the third rectification inversion circuit 230 and the multi-winding integrated transformer T0 can make the low-voltage battery 500 or the battery pack pre-charge the power battery pack 700, and the pre-charge relay and the pre-charge resistor in the vehicle power supply architecture are omitted, so as to reduce the cost of the vehicle power supply architecture.

[0117] In the embodiment, the low-voltage power distribution circuit 300 is connected to the second winding and the third winding of the multi-winding integrated transformer T0 via the second rectification inversion circuit 220230, which not only makes the low-voltage power distribution circuit 300 simultaneously connected to the power battery pack 700 and the battery pack 710 in the power battery pack 700 via the multi-winding integrated transformer T0, but also realizes the state switching time of 100 microseconds (us) level based on the transformer with four windings, and the switching rate is much higher than the switching time of 10 microseconds (us) level of the relay.

[0118] In some embodiments, the first winding of the multi-winding integrated transformer T0 and the first rectification inversion circuit 210 can not need to be provided with a resonant inductor, and by controlling the working mode of the second rectification inversion circuit 220, the second winding and the third winding of the multi-winding integrated transformer T0 are connected in series, so as to generate a 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 rectification inversion circuit 210.

[0119] In some embodiments, the fourth winding of the multi-winding integrated transformer T0 and the third rectification inversion circuit 230 can not need to be provided with a resonant inductor, and by controlling the working mode of the second rectification inversion circuit 220, the second winding and the third winding of the multi-winding integrated transformer T0 are connected in series, so as to generate a 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 rectification inversion circuit 220.

[0120] In some embodiments, referring to FIG. 4, 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, so as to accurately know the discharge capacity of the low-voltage battery 500, thereby controlling the working state of the DCDC circuit 200 in the pre-charge mode and adjusting the boost power of the DCDC circuit 200.

[0121] In some embodiments, referring to FIG. 4, the first rectification and inversion circuit 210 includes a first switch Q1 and a second switch Q2, first ends of the first switch Q1 and the second switch Q2 are connected to a first end of the first winding, a second end of the first switch Q1 is connected to a positive pole of the high-voltage input end 110, and a second end of the second switch Q2 is connected to a negative pole of the high-voltage input end 110.

[0122] In some embodiments, referring to FIG. 4, the first rectification and inversion circuit 210 includes a first switch Q1, a second switch Q2, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4, first ends of the first switch Q1 and the second switch Q2 are connected to a first end of the first winding, a second end of the first switch Q1, a first end of the first capacitor C1, and a second end of the second capacitor C2 are connected to a positive pole of the high-voltage input end 110, a second end of the second switch Q2, a first end of the third capacitor C3, and a second end of the first capacitor C1 are connected to a negative pole of the high-voltage input end 110, a second end of the second capacitor C2 and a second end of the third capacitor C3 are connected to a first end of the fourth capacitor C4, and a second end of the fourth capacitor C4 is connected to a second end of the first winding.

[0123] In some embodiments, referring to FIG. 4, a current sensor CT1 is further arranged between the common node of the first switch Q1 and the second switch Q2 and the first end of the first winding, the current sensor CT1 is configured to detect a current flowing through the first winding and output a detection result to the controller 600, and the controller 600 controls a switching duty ratio and a switching frequency of the first switch Q1 and the second switch Q2 according to the detection result.

[0124] In some embodiments, by adjusting the switching duty cycle of the first switch tube Q1 and the second switch tube Q2, the direct current output by the power battery pack 700 can be converted into alternating current output to the first winding. The second winding, the third winding and the fourth winding can all serve as secondary windings to receive induced current. When the voltage difference between the battery pack 710 and other battery packs in the power battery pack 700 exceeds a threshold voltage, the fourth winding induced alternating current output can be converted into direct current by the third rectifier-inverter circuit 230 and output to the battery pack 710 for equalization. The second rectifier-inverter circuit 220 controlled by the controller 600 can convert the alternating current output by the second winding and the third winding into direct current and output to the low-voltage power distribution circuit 300. Furthermore, 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. Not only can the power battery pack 700 provide low-voltage power distribution for the entire vehicle, but it can also match the current transmission direction between the power battery pack 700, the battery pack 710 and the low-voltage power distribution circuit 300 according to the vehicle's power demand. In the event of a low-voltage battery 500 failure, 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 vehicle costs, and also reducing signal delay between the controller 600 and the DCDC circuit 200 and the low-voltage power distribution circuit 300, improving vehicle stability.

[0125] In some embodiments, referring to FIG. 4, the second rectifier-inverter circuit 220 includes a third switch tube Q3 and a fourth switch tube Q4. The first end of the third switch tube Q3 is connected to the first end of the second winding, and the first end of the fourth switch tube Q4 is connected to the first end of the third winding. The second end of the third switch tube Q3 and the second end of the fourth switch tube Q4 are connected to the negative terminal of the low-voltage power distribution circuit 300. The second end of the second winding and the second end of the third winding are connected to the positive terminal of the low-voltage power distribution circuit 300.

[0126] In the embodiment, the third switch Q3 and the fourth switch Q4 can constitute a half-bridge rectifier circuit. By adjusting the switching duty cycle of the switch in the third rectifier inverter circuit 230, the DC power output by the battery pack 710 can be converted into AC power output to the fourth winding. The fourth winding can also generate DC power from the induced current to charge the battery pack 710. The second winding and the third winding can both be secondary windings that receive induced current. The third switch Q3 and the fourth switch Q4 controlled by the controller 600 can convert the AC power output by the second winding and the third winding into DC power output to the low-voltage power distribution circuit 300. In addition, when the vehicle is not outputting high-voltage power, the first rectifier inverter circuit 210 does not work, and the second rectifier inverter circuit 220 can supply DC power output by the battery pack 710 to the low-voltage power distribution circuit 300 through the multi-winding integrated transformer T0, thereby providing low-voltage power distribution for the entire vehicle through the energy inside the power battery pack 700. Through the low-voltage integrated power distribution architecture of the present application, a large-capacity low-voltage battery 500 is not required, the cost of the vehicle is reduced, and the signal delay between the controller 600 and the DCDC circuit 200 and the low-voltage power distribution circuit 300 is also reduced, thereby improving the stability of the vehicle.

[0127] In some embodiments, referring to FIG. 4, the second rectifier inverter circuit 220 further includes a second inductor L2 and a fifth capacitor C5. A voltage sensor V can be disposed across 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 constitute an LC resonant 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, and can also adjust the boost power of the DCDC circuit 200 by controlling the duty cycle of the third switch Q3 and the fourth switch Q4.

[0128] In some embodiments, referring to FIG. 4, the first load switch module 310 includes a plurality of electronic switches for controlling the power supply state of a plurality of power loads.

[0129] In the embodiment, the plurality of electronic switches are respectively connected to the plurality of loads, and the power supply output of the plurality of loads is controlled by the plurality of electronic switches. Therefore, each load can be controlled according to the function of the load connected to the low-voltage load port, or each load can be controlled according to the application scenario of the load.

[0130] In some embodiments, the first load switch module 310 can include a plurality of electronic switches, as shown in FIG. 4, the first load switch module 310 can include a fourth electronic switch T11, a fifth electronic switch T12, and a sixth electronic switch T13, which are connected in parallel, and one end of which is connected to the first end of the second bidirectional switch module K2, and the other end of which is connected to a first load, a second load, and a third load connected to the first low-voltage load power supply end 121, respectively. The first load, the second load, and the third load can be vehicle internal safety control type electrical loads, such as vehicle controller, light, steering, brake, and the like.

[0131] In some embodiments, as shown in FIG. 5, the second low-voltage load power supply end 122 includes a plurality of power supply ends, which can be connected to vehicle internal comfort type loads, such as vehicle air conditioner, seat heating, and the like.

[0132] 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, which are connected in parallel, and one end of which is connected to the second end of the second bidirectional switch module K2, and the other end of which is connected to a fourth load, a fifth load, and a sixth load connected to the second low-voltage load power supply end 122, respectively. The fourth load, the fifth load, and the sixth load can be vehicle internal comfort type loads, such as vehicle air conditioner, seat heating, and the like.

[0133] In some specific application embodiments, the low-voltage power distribution part can be provided with a plurality of electronic switches connected to a plurality of loads, and the plurality of loads can be classified into category 1, category 2, and category 3 according to load characteristics, wherein category 1 includes vehicle starting related functional loads such as power management system, vehicle controller, domain controller 600, and the like; category 2 includes comfort related functional loads such as fan, air conditioner, and the like; and category 3 includes driving safety related loads such as steering, braking, and the like. When the vehicle is started, only the loads in category 1 are started, and after the DCDC circuit 200 works normally, the loads in category 2 and category 3 are started, so that the power demand on the low-voltage battery 500 (such as a 12V small battery) can be reduced.

[0134] In some embodiments, as shown in FIG. 4, the first bidirectional switch module K1 includes a first electronic switch T1 and a second electronic switch T2 arranged opposite to each other.

[0135] When the vehicle is started, the first electronic switch T1 and the second electronic switch T2 are turned on, the controllers of the vehicle interior driving safety category are preferentially powered, then the main positive relay and the main negative relay in the power management circuit are closed, the DCDC circuit 200 is started, and then all the electronic switches in the first load switch module 310 are closed, and the vehicle is powered on.

[0136] In some embodiments, the first electronic switch T1 and the second electronic switch T2 are both MOSFETs, and the sources of the first electronic switch T1 and the second electronic switch T2 are connected in common, or the drains thereof are connected in common.

[0137] In some embodiments, after the vehicle high-voltage power-on is completed, the DCDC circuit 200 normally works, the first bidirectional switch module K1 is turned off, the low-voltage battery 500 does not need to output current, and mainly provides low-voltage power for all low-voltage loads connected to the low-voltage power distribution circuit 300 through the DCDC circuit 200.

[0138] In some embodiments, referring to FIG. 4, the first winding is connected to the first rectifier-inverter circuit 210 through the first resonant inductor unit L1.

[0139] In some embodiments, the first resonant inductor unit L1 includes at least one inductor.

[0140] In the present 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 through 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 through 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 through 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 through the third rectifier-inverter circuit 230, corresponding direct current is obtained to supply power to the low-voltage power distribution circuit 300.

[0141] 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 through the third rectifier-inverter circuit 230, and the third rectifier-inverter circuit 230 is a smaller power module, and the power thereof can be in the order of hundreds of watts. Before the high-voltage power-on of the power battery pack 700, not only can the low-voltage power distribution circuit 300 of the vehicle be powered, but also the closing of the total positive relay K11 of the power battery pack 700 can be pre-charged.

[0142] When the power battery pack 700 and the battery pack 710 both output electric energy, before the whole vehicle is powered on, the battery pack 710 can pre-charge the pre-charging capacitor C0 at both ends of the power battery pack 700, at this time, the voltage and current requirements of each winding of the multi-winding integrated transformer T0 are high, and the low-voltage constant-voltage output can be realized by closed-loop control of the output current of the battery pack 710.

[0143] In some embodiments, referring to FIG. 6, 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 realize 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 realize isolation between the battery pack 710 and the low-voltage power distribution circuit 300, and the first DCDC module 240 and the second DCDC module 250 are both connected to the power input end of the low-voltage power distribution circuit 300.

[0144] In this embodiment, the first DCDC module 240 can convert the high-voltage power output by the power battery pack 700 into low-voltage power and output to the low-voltage power distribution circuit 300, and 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 low-voltage power and output to the low-voltage power distribution circuit 300. In this way, the low-voltage power distribution circuit 300 can be simultaneously connected to the power battery pack 700 and the battery pack 710 in the power battery pack 700 via the first DCDC module 240 and the second DCDC module 250, respectively, to realize the function of providing low-voltage power distribution for the whole 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 whole vehicle by the battery pack 710 in 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 demand of the vehicle. Through the scheme in this embodiment, in the case of failure of 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 multiplexing the power battery pack 700, without the need for a large-capacity low-voltage battery 500, thereby reducing the cost of the vehicle, and also reducing the signal delay between the controller 600 and the DCDC circuit 200 and the low-voltage power distribution circuit 300, and improving the stability of the vehicle.

[0145] In some embodiments, the first DCDC module 240 and the second DCDC module 250 can be bidirectional voltage conversion circuits, so that the working state of the first DCDC module 240 and the second DCDC module 250 can be controlled by the controller 600, so as to match the current transmission direction between the power battery pack 700, the battery pack 710 and the low-voltage power distribution circuit 300 according to the vehicle power demand. In the case of 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 through the low-voltage integrated power distribution architecture of the present application, so as to realize the low-voltage power distribution of the vehicle by multiplexing the power battery pack 700, without the need for a large-capacity low-voltage battery 500, thereby reducing the cost of the vehicle, and also reducing the signal delay between the controller 600 and the DCDC circuit 200 and the low-voltage power distribution circuit 300, and improving the stability of the vehicle.

[0146] In some embodiments, the second DCDC module 250 can convert the voltage of the battery pack 710 into a low-voltage power output to the low-voltage power distribution circuit 300, or can receive the voltage input by the low-voltage power distribution circuit 300 and convert it into a suitable charging voltage to charge the battery pack 710.

[0147] In some embodiments, the voltage output by 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.

[0148] In some embodiments, the voltage of the low-voltage power output by the first DCDC module 240 and the second DCDC module 250 to the low-voltage power distribution circuit 300 can be 12V or 24V.

[0149] In some embodiments, the controller 600 is further configured to control the first DCDC module 240 to convert the first voltage output by the power battery pack 700 into a low-voltage power 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.

[0150] In the present embodiment, after the vehicle high-voltage power-up is completed and normal work is started, the first DCDC module 240 outputs a low-voltage power to supply power to the low-voltage power distribution circuit 300, and at the same time, the second DCDC module 250 takes the low-voltage power output by the first DCDC module 240 as input to charge the battery pack 710 in 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 unit in the power battery pack 700, so as to realize the charging and balancing of the battery pack 710 in the power battery pack 700.

[0151] 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 the low-voltage power supply, and control the second DCDC module 250 to convert the second voltage provided by the battery pack 710 into the low-voltage power supply to power the low-voltage power distribution circuit 300 when the required power of the low-voltage power distribution circuit 300 exceeds the preset power threshold.

[0152] In this embodiment, after the vehicle is powered on at high voltage, the first DCDC module 240 normally works, but the second DCDC module 250 is in a standby state, and the first DCDC module 240 mainly provides low-voltage power for all low-voltage loads in the vehicle. When the vehicle is driving, 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 decreases, 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.

[0153] In some embodiments, the rated voltage of the low-voltage power distribution circuit 300 is 12V, and the first threshold voltage can be 12V-0.3V=11.7V.

[0154] 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 the 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 the second voltage to charge the battery pack 710 when the required power of the low-voltage power distribution circuit 300 is less than the preset power threshold.

[0155] In this embodiment, after the vehicle is powered on at high voltage, the first DCDC module 240 normally works, but the second DCDC module 250 is in a standby state, and the first DCDC module 240 mainly provides low-voltage power for all low-voltage loads in the vehicle. When the vehicle is driving, the instantaneous voltage of the low-voltage power distribution circuit 300 is higher than the second threshold voltage, triggering the second DCDC module 250 to start, and the second DCDC module 250 is adjusted to have the low-voltage power distribution circuit 300 as the input and the battery pack 710 in the power battery pack 700 as the output, thereby realizing absorbing the instantaneous overvoltage of the low-voltage power distribution circuit 300, protecting the low-voltage power distribution circuit 300, and achieving the purpose of charging the battery pack 710.

[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 the low-voltage power supply, and control the second DCDC module 250 to convert the second voltage provided by the battery pack 710 into the low-voltage power supply to power the low-voltage distribution circuit 300 when the first DCDC module 240 fails.

[0157] 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 the low-voltage power supply, and control the second DCDC module 250 to convert the second voltage provided by the battery pack 710 into the low-voltage power supply to power the low-voltage distribution circuit 300 when the battery management circuit fails.

[0158] In some embodiments, when the first DCDC module 240 and the high-voltage loop (such as a relay, a high-voltage connector, a non-start-stop cell, etc.) fail when the vehicle is normally running, the second DCDC module 250 can be quickly started and connected to the low-voltage load loop, intelligently distributed through the low-voltage distribution circuit 300, and only power the vehicle safety loads such as brakes, steering, warning lights, etc., to ensure the user's basic steering and parking safety operation.

[0159] In some embodiments, referring to FIG. 7, the low-voltage integrated power distribution architecture further includes a vehicle heat sink 140; the circuit board 100 is disposed on a first side of the vehicle heat sink 140, and the low-voltage battery 500 is disposed on a second side of the vehicle heat sink 140, which 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.

[0160] In some embodiments, referring to FIG. 7, the low-voltage integrated power distribution architecture further includes a base 131 and a cover plate 132, which form a containing cavity for containing the vehicle heat sink 140, the circuit board 100, and the low-voltage battery 500.

[0161] 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 to the low-voltage 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.

[0162] 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 to a third voltage and output the third voltage to the low-voltage power distribution circuit 300 in the event of a failure of the low-voltage battery 500. In some application embodiments, the second voltage can be 12V, 24V, 36V, or 48V.

[0163] In the embodiments of the present application, through the low-voltage integrated power distribution architecture of the present application, in the event of a failure of the low-voltage battery 500, the low-voltage power distribution circuit 300 can be powered by the power battery pack 700 or the battery pack 710 in the power battery pack 700, thereby realizing low-voltage power distribution of the vehicle by multiplexing the power battery pack 700, replacing the power distribution scheme of 2 low-voltage small batteries, and achieving the purpose of reducing cost.

[0164] In some embodiments, the controller 600 is further configured to control the working state of the DCDC circuit 200 to charge the battery pack 710 by the power battery pack 700 in the event that the power of the battery pack 710 is less than a preset value.

[0165] In some embodiments, the controller 600 is further configured to control the DCDC circuit 200 to start to control the battery pack 710 to supply power to the low-voltage power supply end 120 in the event that the demand power of the low-voltage power supply end 120 exceeds a preset power threshold.

[0166] In some embodiments, the controller 600 is further configured to control the DCDC circuit 200 to start to control the power battery pack 700 to supply power to the low-voltage power supply end 120 in the event that the demand power of the low-voltage power supply end 120 exceeds a preset power threshold.

[0167] In some embodiments, the controller 600 is further configured to control the DCDC circuit 200 to start to control the battery pack 710 to supply power to the low-voltage power supply end 120 in the event that the vehicle is in a powered-off state and the demand power of the low-voltage power supply end 120 is less than a preset power threshold.

[0168] In some embodiments, the controller 600 is further configured to control the DCDC circuit 200 to start to control the power battery pack 700 to supply power to the low-voltage power supply end 120 in the event that the vehicle is in a powered-off state and the demand power of the low-voltage power supply end 120 is less than a preset power threshold.

[0169] In some embodiments, the controller 600 is further configured to control the DCDC circuit 200 to start to control the power battery pack 700 to charge the battery pack 710 in the event that the vehicle is in a powered-off state and the power of the battery pack 710 is less than a preset value.

[0170] In the 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 on the whole vehicle is triggered, the DCDC circuit 200 is started, the first port of the DCDC circuit 200 is input, the second port and the third port are output, the second port charges the battery pack 710, and at the same time, the controller 600 starts the balancing strategy to make the battery units in the battery pack 710 charge synchronously and finally approach other battery units.

[0171] In some embodiments, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 can be MOSFET or IGBT.

[0172] In some embodiments, the controller 600 can detect the output voltage and the output current of the power battery pack 700 and the battery pack 710, and adjust the switching frequency or the duty cycle of each switching unit according to the detection result, so as to meet the working requirements of the power battery pack 700, the battery pack 710 and the low-voltage distribution circuit 300. When the power battery pack 700 transmits energy to the battery pack 710 and the low-voltage distribution circuit 300, or when the battery pack 710 transmits energy to the power battery pack 700 and the low-voltage distribution circuit 300, the switching frequency or the duty cycle of each switching unit is controlled by using the variable frequency control, the phase shift control or the combination of the variable frequency control and the phase shift control to adjust the energy conversion efficiency. For example, when the load connected to the low-voltage distribution circuit 300 increases, the duty cycle of the first switch tube Q1 and the second switch tube Q2 can be increased, and when the load connected to the low-voltage distribution circuit 300 decreases, the duty cycle of the first switch tube Q1 and the second switch tube Q2 can be reduced. When the controller 600 detects that the current of the primary winding of the multi-winding integrated transformer T0 is greater than a preset threshold current, it indicates that the load connected to the low-voltage distribution circuit 300 may be overloaded or short-circuited, at this time, the first switch tube Q1 and the second switch tube Q2 can be controlled to be turned off to realize overload protection and avoid causing vehicle safety hazards.

[0173] In some embodiments, as shown in FIG. 4, the two ends of the power battery pack 700 are respectively output via the total positive relay K11 and the total negative relay K12. When the total positive relay K11 and the total negative relay K12 are closed, the power battery pack 700 outputs high voltage, and the whole vehicle is powered by the power battery pack 700 in the charging, driving and parking states. The high voltage output by the power battery pack 700 is sequentially subjected to voltage transformation by the first rectifier-inverter circuit 210, the multi-winding transformer T0 and the second rectifier-inverter circuit 220, and then provides a low-voltage power supply for the low-voltage distribution circuit 300.

[0174] In some embodiments, as shown in FIG. 4, an insurance resistor is further arranged between the positive electrode of the power battery pack 700 and the total positive relay K11, which is used to prevent the output current of the power battery pack 700 from being overloaded.

[0175] In some embodiments, the output voltage range of the low-voltage battery 500 is 12V-72V.

[0176] In some embodiments, the low-voltage battery 500 can be a 12V lithium-ion battery or a sodium-ion battery, or other rechargeable battery.

[0177] In some embodiments, the low-voltage battery 500 can include a 24V lithium-ion battery or a sodium-ion battery, or other rechargeable battery.

[0178] In some embodiments, the low-voltage battery 500 can include a 36V lithium-ion battery or a sodium-ion battery, or other rechargeable battery.

[0179] In some embodiments, the low-voltage battery 500 can include one or more battery cells within the rechargeable battery.

[0180] In some embodiments, the low-voltage battery 500 can include one or more battery cells within the rechargeable battery.

[0181] In some embodiments, the output voltage range of the battery pack 710 is 12V-72V.

[0182] In some embodiments, the battery pack 710 includes a 12V lithium-ion battery or a sodium-ion battery, or other rechargeable battery.

[0183] In some embodiments, the battery pack 710 includes a 24V lithium-ion battery or a sodium-ion battery, or other rechargeable battery.

[0184] In some embodiments, the battery pack 710 includes a 48V lithium-ion battery or a sodium-ion battery, or other rechargeable battery.

[0185] In some embodiments, the battery pack 710 includes a 72V lithium-ion battery or a sodium-ion battery, or other rechargeable battery.

[0186] In the present 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.

[0187] The embodiments of the present application also provide a vehicle management system, which includes the low-voltage integrated power distribution architecture according to any one of the above embodiments.

[0188] The embodiments of the present application also provide an automobile, which includes the low-voltage integrated power distribution architecture according to any one of the above embodiments.

[0189] In the embodiment, by integrating the low-voltage integrated power distribution architecture of any one of the above embodiments in the automobile, 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, thereby optimizing the electrical architecture of the vehicle management system, simplifying the related components of the vehicle, and greatly reducing the cost of the vehicle.

[0190] In the embodiment, the low-voltage power distribution circuit 300 is configured with a low-voltage power supply end for accessing low-voltage loads, one end of the low-voltage power distribution circuit 300 is connected with 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 with the high-voltage input end 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, the working states of the low-voltage management circuit 400, the low-voltage power distribution circuit 300, and the DCDC circuit 200 are managed by the functions integrated in the controller 600, thereby integrating the DCDC circuit 200, the low-voltage management circuit 400, the low-voltage power distribution circuit 300, and the low-voltage battery 500, which not only reduces the weight and volume of the power distribution architecture, but also reduces the probability of damage to the circuits in the vehicle caused by the parasitic inductance or parasitic capacitance between the DCDC circuit 200 and the low-voltage battery 500.

[0191] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional units and modules is exemplified, and in actual applications, the above functions can be completed by different functional units and modules according to needs, that is, the internal structure of the device is 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 one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. In addition, the specific names of each functional unit and module are only for easy distinction, and do not limit the protection scope of the present application. The specific working process of the units and modules in the above system can refer to the corresponding process in the foregoing method embodiments, which will not be described here.

[0192] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in detail in a certain embodiment can be referred to the related description of other embodiments.

[0193] In the embodiments of the present application, it should be understood that the disclosed device and method can be implemented in other manners. For example, the embodiments of the electronic device described above are merely schematic. For example, the division of the modules or units is merely logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between different units, or the logical couplings or communication connections between different units, can be indirect couplings or communication connections through some interfaces, devices or units, and can be electrical, mechanical or in other forms.

[0194] The units described as separated components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments of the present application.

[0195] In addition, each functional unit in the embodiments of the present application can be integrated in one processing unit, or each unit can exist physically as a separate unit, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware, or in the form of software functional units.

[0196] The above embodiments are merely used to describe the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A low voltage integrated power distribution architecture, wherein, The application relates to a high-voltage input end, 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 provided with a low-voltage power supply end for connecting a low-voltage load. One end of the low-voltage power distribution circuit is connected with the low-voltage 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. The DCDC circuit, the low-voltage management circuit and the low-voltage power distribution circuit share a same controller which integrates the functions of managing the working states of the low-voltage management circuit, the low-voltage power distribution circuit and the DCDC circuit. The DCDC circuit is used for converting high-voltage power input from the high-voltage input end into low-voltage power output to the low-voltage power distribution circuit, or converting low-voltage power provided by the low-voltage battery into high-voltage power output to the high-voltage input end.

2. The low voltage integrated power distribution architecture of claim 1, wherein, The low-voltage management circuit is controlled by the controller and is used for managing the charging and discharging of the low-voltage battery. The low-voltage power distribution circuit comprises 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 of the DCDC circuit to the low-voltage power supply end, the second energy transmission link is an energy transmission path of the low-voltage management circuit to the low-voltage power supply end, and the third energy transmission link is an energy transmission path of the DCDC circuit to the low-voltage battery.

3. The low voltage integrated power distribution architecture of claim 1, wherein, 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 directions of the first energy transmission link, the second energy transmission link and the third energy transmission link. The low-voltage management circuit comprises:

4. The low voltage integrated power distribution architecture of claim 3, wherein, a detection module connected with the controller and used for detecting the electric parameters of the low-voltage battery. The controller is further used for managing the working state of the low-voltage power distribution circuit according to the electric parameters of the low-voltage battery. The detection module is further used for periodically sampling the electric parameters of the low-voltage battery.

5. The low voltage integrated power distribution architecture of claim 4, wherein, The controller adjusts the working states of the DCDC circuit and the low-voltage power distribution circuit according to the electric parameters of the low-voltage battery, so as to adjust the voltage of the low-voltage power output from the DCDC circuit to the low-voltage management circuit according to the electric parameters of the low-voltage battery. The low-voltage management circuit further comprises a first bidirectional switch module controlled by the controller.

6. The low voltage integrated power distribution architecture of claim 3, wherein, The first bidirectional switch module is used for managing the charging and discharging process of the low-voltage battery under the control of the controller. The low-voltage battery is electrically connected with the low-voltage power distribution circuit through the first bidirectional switch module.

7. The low voltage integrated power distribution architecture of claim 6, wherein, The low-voltage power distribution circuit further comprises a second bidirectional switch module controlled by the controller.

8. The low voltage integrated power distribution architecture of any of claims 2-7, wherein, The second bidirectional switch module is used for controlling the connection state between the DCDC circuit and the low-voltage management circuit and controlling the current direction between the DCDC circuit and the low-voltage management circuit. The low-voltage power distribution circuit further comprises a first load switch module controlled by the controller.

9. The low voltage integrated power distribution architecture of claim 8, wherein, ​ The first load switch module is connected between the first end of the second bidirectional switch module and a first low-voltage load power supply end.

10. The low voltage integrated power distribution architecture of claim 8, wherein, 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 a second low-voltage load power supply end.

11. The low voltage integrated power distribution architecture of any of claims 1-10, wherein, 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 of any of claims 1-10, wherein, The low-voltage integrated power distribution architecture further comprises: A temperature control pipeline is provided with a cooling medium; 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 of any of claims 1-10, wherein, The DCDC circuit comprises 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 end 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 connected in parallel.

14. The low voltage integrated power distribution architecture of claim 13, wherein, The low-voltage integrated power distribution architecture further comprises a low-voltage input end for connecting to a battery pack in the power battery pack. The DCDC circuit further comprises a third rectifier-inverter circuit, and a fourth winding of the multi-winding transformer is connected to the low-voltage input end via the third rectifier-inverter circuit.

15. The low voltage integrated power distribution architecture of claim 13, wherein, 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.

16. The low voltage integrated power distribution architecture of claim 13, wherein, The first rectifier-inverter circuit comprises at least one bridge arm and a driving module; the driving module comprises a high-voltage isolated driving chip controlled by the controller to drive the bridge arm.

17. The low voltage integrated power distribution architecture of claim 16, wherein, The bridge arm and the driving module are powered by an isolated power supply.

18. The low voltage integrated power distribution architecture of any of claims 1-17, wherein, The DCDC circuit is further used for voltage boosting processing of the voltage output by the low-voltage management circuit to pre-charge a pre-charge capacitor connected to the high-voltage input end.

19. The low voltage integrated power distribution architecture of any of claims 1-17, wherein, The low-voltage integrated power distribution architecture further comprises a vehicle heat sink; the circuit board is arranged on a first side of the vehicle heat sink, 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 for heat dissipation of the circuit board and the low-voltage battery.

20. An automobile, wherein, The automobile comprises a power battery pack and the low-voltage integrated power distribution architecture according to any one of claims 1 to 19, and the power battery pack is connected to the high-voltage input end.

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