Integrated low-voltage power distribution architecture, power distribution system, and vehicle

Abstract

Disclosed in the present application are an integrated low-voltage power distribution architecture, a power distribution system, and a vehicle. The integrated low-voltage power distribution architecture comprises a first load voltage terminal, a second load voltage terminal, a low-voltage battery, a first bidirectional direct-current conversion circuit, and a power source distribution circuit. The power source distribution circuit, the low-voltage battery, and the first bidirectional direct-current conversion circuit are controlled by the same controller to provide power output to the first load voltage terminal and the second load voltage terminal; the first load voltage terminal and the second load voltage terminal can provide a first voltage and a second voltage, respectively, to the outside on the basis of a low-voltage load requirement, such that the controller can flexibly control a low-voltage power distribution system; when the vehicle is configured with a high-power load, a load voltage terminal having a higher output voltage can provide electric energy to the vehicle; and under the same power, the output current of the low-voltage power distribution system can be significantly reduced, thereby reducing safety hazards of the low-voltage power distribution system.

Description

Low-voltage power distribution integrated architecture, power distribution system and vehicle

[0001] This application refers to the Chinese Patent Application No. 202411394785.5, filed on September 30, 2024, entitled "Low-voltage power distribution integrated architecture, power distribution system and vehicle", which is incorporated by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of circuit technology, in particular to a low-voltage power distribution integrated architecture, a power distribution system and a vehicle. BACKGROUND

[0003] Currently, vehicles usually use low-voltage power distribution circuits that only output one voltage. As the functional electrical appliances inside the vehicle become more and more abundant, if the vehicle load power increases, there may be a problem that the output current of the low-voltage power distribution circuit exceeds the current carrying capacity, which increases the safety hazard of vehicle power consumption. TECHNICAL PROBLEM

[0004] The present application provides a low-voltage power distribution integrated architecture, a power distribution system and a vehicle, aiming to solve the problem that the current low-voltage power distribution system faces the safety hazard of increasing vehicle load power. TECHNICAL SOLUTION

[0005] In view of the above problems, the present application provides a low-voltage power distribution integrated architecture, a power distribution system and a vehicle, aiming to solve the problem that the current low-voltage power distribution system faces the safety hazard of increasing vehicle load power.

[0006] The first aspect of the embodiment of the present application provides a low-voltage power distribution integrated architecture, which comprises:

[0007] A low-voltage battery is used to provide a first voltage;

[0008] A first bidirectional direct current conversion circuit is used to realize conversion between the first voltage and a second voltage;

[0009] A power distribution circuit is connected with the first bidirectional direct current conversion circuit and the low-voltage battery, and is used to supply power to a first load voltage terminal and / or a second load voltage terminal according to the received first voltage and second voltage;

[0010] The power distribution circuit, the low-voltage battery and the first bidirectional direct current conversion circuit are controlled by the same controller.

[0011] In the technical scheme of the embodiment, the first voltage output by the low-voltage battery is output to the first load voltage terminal, the first bidirectional direct-current conversion circuit converts the first voltage output by the low-voltage battery into the second voltage and outputs the second voltage to the second load voltage terminal, the power distribution circuit, the low-voltage battery and the first bidirectional direct-current conversion circuit are controlled by the same controller to output power to the first load voltage terminal and the second load voltage terminal, the first load voltage terminal and the second load voltage terminal can respectively provide the first voltage and the second voltage according to the low-voltage load demand, so that the controller can flexibly control the low-voltage power distribution system, when the vehicle is configured with a high-power load, the load voltage terminal with a higher output voltage can be used to provide power for the high-power load, and the output current of the low-voltage power distribution system can be greatly reduced, thereby reducing the safety hazard of the low-voltage power distribution system and solving the problem that the power supply current of the current automobile 12V power supply is too large, the wire harness diameter is too thick and the connector is too large.

[0012] In some embodiments, the power distribution circuit comprises:

[0013] One or more self-recovery overcurrent protection devices are connected between the first bidirectional direct-current conversion circuit and the second load voltage terminal, and the self-recovery overcurrent protection device is controlled by the controller to turn off the power supply of the second load voltage terminal when the output current of the second load voltage terminal is overcurrent.

[0014] In the embodiment, the second load voltage terminal can output the second voltage with a lower voltage to the outside, so that when the demand power of the external load is high, the output current of the second load voltage terminal is too high, the self-recovery overcurrent protection device is used to turn off the power supply of the second load voltage terminal when the output current of the second load voltage terminal is overcurrent, and the self-recovery overcurrent protection device is turned on when the output current of the second load voltage terminal is within the safe current range, so that the power supply of the second load voltage terminal is ensured in time, and the safety hazard of the low-voltage power distribution system is reduced.

[0015] In some embodiments, the low-voltage power distribution integrated architecture further comprises:

[0016] The power-on terminal is connected with the first bidirectional direct-current conversion circuit and is used for accessing the externally input second voltage.

[0017] The first bidirectional direct-current conversion circuit is further used for converting the second voltage provided by the power-on terminal into the first voltage and outputting the first voltage to the low-voltage battery, so as to charge the low-voltage battery.

[0018] In the technical scheme of the embodiment of the application, the power-on end can access the second voltage outside in the case of low-voltage battery power shortage, and then the first bidirectional direct-current conversion circuit converts the second voltage provided by the power-on end into the first voltage and outputs the first voltage to the low-voltage battery, so as to charge the low-voltage battery, and achieve the purpose of supplementing the low-voltage battery in the case of vehicle power shortage. In this way, the portable power supply can supplement the low-voltage battery of the vehicle in the case of vehicle breakdown on the road, and timely meet the power supply of the key functional load in the vehicle, thereby improving the flexibility of low-voltage supplement of the vehicle.

[0019] In some embodiments, the low-voltage power distribution integrated architecture further includes:

[0020] The battery management circuit is configured to manage charging and discharging of the low-voltage battery under the control of the controller.

[0021] In the technical scheme of the embodiment of the application, the battery management circuit can manage charging and discharging of the low-voltage battery, the battery management circuit, the first bidirectional direct-current conversion circuit and the self-recovery overcurrent protection device are integrated, the communication time between the battery management circuit and the controller can be reduced, the controller can manage the battery management circuit, the first bidirectional direct-current conversion circuit and the self-recovery overcurrent protection device in a short time, the distance of the communication cable is reduced, and the working stability of the battery management circuit, the first bidirectional direct-current conversion circuit and the power supply distribution circuit is improved.

[0022] In some embodiments, the low-voltage power distribution integrated architecture further includes:

[0023] The external voltage input end is connected with the battery management circuit and the power supply distribution circuit, and configured to provide the first voltage for the battery management circuit and the power supply distribution circuit.

[0024] In the technical scheme of the embodiment of the application, the first voltage is received through the external voltage input end, and the first voltage is provided for the battery management circuit and the first load voltage end, so as to establish an energy transmission path between the low-voltage battery and the external power supply in the low-voltage power distribution system, realize a power supply architecture with multiple power inputs and multiple power outputs, achieve the purpose of simple and flexible distribution of electric energy, and ensure stable power supply of a certain number of load voltage ends when one of the power supplies fails, thereby improving the stability and safety of low-voltage power distribution of the vehicle.

[0025] In some embodiments, the low-voltage power distribution integrated architecture further includes:

[0026] The bidirectional switch circuit is connected between the external voltage input end and the battery management circuit, and configured to control the current direction between the external voltage input end and the battery management circuit.

[0027] In the technical solution of the embodiment of the application, the bidirectional switch circuit can control the current direction between the external voltage input end and the battery management circuit. In the case that the external voltage input end is connected to the internal power battery pack of the vehicle, the power battery pack can supply power to the low-voltage battery. In addition, when the vehicle is started, the low-voltage battery can pre-charge the capacitor at both ends of the power battery pack, so as to achieve the purpose of fast starting.

[0028] In some embodiments, the low-voltage power distribution integrated architecture further comprises:

[0029] a voltage detection circuit configured to detect the voltage of the common end of the corresponding bidirectional switch circuit and generate a corresponding voltage detection signal according to the detection result and output the voltage detection signal to the controller;

[0030] The controller is further configured to control the switching state of the bidirectional switch circuit and determine the switching detection result according to the switching state of the bidirectional switch circuit and the voltage detection signal.

[0031] In the technical solution of the embodiment of the application, the voltage detection circuit can detect the voltage of the common end of the corresponding bidirectional switch circuit and generate a corresponding voltage detection signal according to the detection result. The controller can actively control the switching state of the bidirectional switch circuit and determine the performance of each bidirectional switch circuit according to the switching state of the bidirectional switch circuit and the voltage detection signal, thereby realizing the diagnosis of the bidirectional switch circuit.

[0032] In some embodiments, the bidirectional switch circuit comprises a first switching device and a second switching device.

[0033] The input ends of the first switching device and the second switching device are respectively connected to the first voltage bus and the second voltage bus. The external voltage input end is connected to at least one first load voltage end through the first voltage bus, and the battery management circuit is connected to at least one first load voltage end through the second voltage bus.

[0034] The switching state of the first switching device and the second switching device is controlled by the controller, and the output end of the first switching device and the output end of the second switching device are connected to the voltage detection circuit.

[0035] In the technical solution of the embodiment of the present application, the output end of the first switching device and the output end of the second switching device are connected to the voltage detection circuit. When the first switching device and the second switching device are in the on state, the current of the first voltage bus can flow to the voltage detection circuit through the first switching device, and the current of the second voltage bus can flow to the voltage detection circuit through the second switching device. When the controller controls one of the bidirectional switching circuits to perform self-checking, the first switching device and the second switching device in the bidirectional switching circuit can be controlled to be disconnected first, and then the first switching device and the second switching device can be controlled to be turned on. The voltage detection circuit detects the voltage at the common end to obtain a first voltage detection signal. Then, the voltage detection circuit detects the voltage at the common end to obtain a second voltage detection signal. In this way, the controller can determine the performance of the bidirectional switching circuit based on the first voltage detection signal and the second voltage detection signal.

[0036] In some embodiments, the first bidirectional direct current conversion circuit includes an interleaved BUCK circuit.

[0037] In the technical solution of the embodiment of the present application, the interleaved BUCK circuit can be a multi-path parallel buck-boost converter composed of multiple identical BUCK circuit modules. The on time of the switching tube of each BUCK circuit is determined according to the input voltage and the output voltage to achieve a stable output voltage. When the input voltage is applied to the interleaved BUCK circuit, the first BUCK circuit starts to work, the switching tube is turned on, the inductor stores part of the energy, and the output voltage is stabilized. At the same time, the switching tube of the second BUCK circuit is in the off state and does not participate in energy conversion. With the passage of time, the switching tube of the first BUCK circuit is turned off, and the switching tube of the second BUCK circuit starts to conduct, and its inductor also stores part of the energy, and the output voltage continues to be stabilized. At the same time, the switching tube of the first BUCK circuit is in the off state and does not participate in energy conversion. In this way, multiple BUCK circuit modules work in an interleaved manner to achieve a high-efficiency, low-ripple, high-power output buck-boost conversion. In this way, the current can be reduced, the power loss can be reduced, the voltage conversion efficiency and the stability of the output voltage can be improved, and the demand of high-power applications can be met.

[0038] In some embodiments, the self-restoring overcurrent protection device includes an electronic fuse.

[0039] The second aspect of the embodiment of the present application further provides a power distribution system, which includes the low-voltage power distribution integrated architecture according to any one of the above embodiments.

[0040] The third aspect of the embodiment of the present application further provides a vehicle, which includes a first voltage bus, a second voltage bus, a power battery pack, and the low-voltage power distribution integrated architecture according to any one of the above embodiments.

[0041] In the technical scheme of the embodiment of the present application, the power battery pack provides a first voltage to an external voltage input end of a low-voltage power distribution integrated architecture, the external voltage input end is connected to at least one first load voltage end through a first voltage bus, and the battery management circuit is connected to at least one first load voltage end through a second voltage bus. The first load voltage end and the second load voltage end are powered and output by the power supply distribution circuit, the low-voltage battery and the first bidirectional direct-current conversion circuit controlled by the same controller, and the first load voltage end and the second load voltage end can provide the first voltage and the second voltage respectively according to the low-voltage load demand, so that the controller can flexibly control the low-voltage power distribution system. When the vehicle is configured with a high-power load, the load voltage end with a higher output voltage can provide power for the high-power load, and the output current of the low-voltage power distribution system can be greatly reduced under the same power, thereby reducing the safety hazard of the low-voltage power distribution system.

[0042] The above description is only a summary of the technical scheme of the present application. In order to more clearly understand the technical means of the present application, the embodiment of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. Advantages

[0043] In the technical scheme of the embodiment of the present application, the power battery pack provides a first voltage to an external voltage input end of a low-voltage power distribution integrated architecture, the external voltage input end is connected to at least one first load voltage end through a first voltage bus, and the battery management circuit is connected to at least one first load voltage end through a second voltage bus. The first load voltage end and the second load voltage end are powered and output by the power supply distribution circuit, the low-voltage battery and the first bidirectional direct-current conversion circuit controlled by the same controller, and the first load voltage end and the second load voltage end can provide the first voltage and the second voltage respectively according to the low-voltage load demand, so that the controller can flexibly control the low-voltage power distribution system. When the vehicle is configured with a high-power load, the load voltage end with a higher output voltage can provide power for the high-power load, and the output current of the low-voltage power distribution system can be greatly reduced under the same power, thereby reducing the safety hazard of the low-voltage power distribution system. BRIEF DESCRIPTION OF DRAWINGS

[0044] 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 similar parts throughout the several views. In the drawings:

[0045] FIG. 1 is a first structure schematic diagram of a low-voltage power distribution integrated architecture provided by the embodiment of the present application;

[0046] Fig. 2 is a second structural schematic diagram of the low-voltage power distribution integrated architecture provided by the embodiment of the present application;

[0047] Fig. 3 is a third structural schematic diagram of the low-voltage power distribution integrated architecture provided by the embodiment of the present application;

[0048] Fig. 4 is a fourth structural schematic diagram of the low-voltage power distribution integrated architecture provided by the embodiment of the present application;

[0049] Fig. 5 is a fifth structural schematic diagram of the low-voltage power distribution integrated architecture provided by the embodiment of the present application;

[0050] Fig. 6 is a sixth structural schematic diagram of the low-voltage power distribution integrated architecture provided by the embodiment of the present application;

[0051] Fig. 7 is a seventh structural schematic diagram of the low-voltage power distribution integrated architecture provided by the embodiment of the present application;

[0052] Fig. 8 is an eighth structural schematic diagram of the low-voltage power distribution integrated architecture provided by the embodiment of the present application;

[0053] Fig. 9 is a ninth structural schematic diagram of the low-voltage power distribution integrated architecture provided by the embodiment of the present application;

[0054] Fig. 10 is a tenth structural schematic diagram of the low-voltage power distribution integrated architecture provided by the embodiment of the present application;

[0055] Fig. 11 is an eleventh structural schematic diagram of the low-voltage power distribution integrated architecture provided by the embodiment of the present application;

[0056] Fig. 12 is a twelfth structural schematic diagram of the low-voltage power distribution integrated architecture provided by the embodiment of the present application;

[0057] Fig. 13 is a thirteenth structural schematic diagram of the low-voltage power distribution integrated architecture provided by the embodiment of the present application. Embodiments of the present application

[0058] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying 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.

[0059] 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.

[0060] 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.

[0061] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase is not necessarily referring to the same embodiments at different places in the specification, nor is it necessarily independent or alternative embodiments 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.

[0062] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of 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 " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0063] In the description of the embodiments of the present application, the term "multiple frames" refers to two or more (including two).

[0064] 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", etc. The orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and does 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.

[0065] In the current power distribution system, the low-voltage power distribution circuit only outputs one voltage. With the increasing functionality of electrical appliances inside the vehicle, if the vehicle load power increases, there may be a problem that the output current of the low-voltage power distribution circuit exceeds the current carrying capacity, increasing the safety hazard of vehicle power consumption.

[0066] To solve the above technical problems, the low-voltage power distribution integrated architecture provided in the embodiment of the present application comprises: a first load voltage end 410, a second load voltage end 420, a low-voltage battery 100, a first bidirectional direct-current conversion circuit 200, and a power distribution circuit 300. The low-voltage battery 100 is configured to provide a first voltage. The first bidirectional direct-current conversion circuit 200 is configured to convert the first voltage into a second voltage. The power distribution circuit 300 is connected between the first bidirectional direct-current conversion circuit 200 and the second load voltage end 420. The power distribution circuit 300 is configured to supply power to the first load voltage end and / or the second load voltage end according to the received first voltage and second voltage.

[0067] In the embodiment, the low-voltage battery 100 outputs the first voltage to the power distribution circuit 300. The first bidirectional direct-current conversion circuit 200 converts the first voltage output by the low-voltage battery 100 into the second voltage and outputs the second voltage to the power distribution circuit 300. The power distribution circuit 300, the low-voltage battery 100, and the first bidirectional direct-current conversion circuit 200 are controlled by the same controller 500 to supply power to the first load voltage end 410 and the second load voltage end 420. The first load voltage end 410 and the second load voltage end 420 can respectively provide the first voltage and the second voltage to the outside according to the low-voltage load demand. Thus, the controller 500 can flexibly control the low-voltage power distribution system. When the vehicle is configured with a high-power load, the load voltage end with a higher output voltage can supply power to the load. At the same power, the output current of the low-voltage power distribution system can be greatly reduced, thereby reducing the safety hazard of the low-voltage power distribution system.

[0068] In some embodiments, the first load voltage end 410 can provide the first voltage to the connected load, and the second load voltage end 420 can provide the second voltage to the connected load. The second voltage is less than the first voltage.

[0069] In some embodiments, as shown in FIG. 2, the power distribution circuit comprises one or more self-recovery overcurrent protection devices 310. The self-recovery overcurrent protection device 310 is connected between the first bidirectional direct-current conversion circuit 200 and the second load voltage end 420. The self-recovery overcurrent protection device 310 is controlled by the controller 500 to shut off the power supply of the second load voltage end 420 when the output current of the second load voltage end 420 is overcurrent.

[0070] In the embodiment, the power distribution circuit 300 shuts off the power supply of the second load voltage end 420 when the output current of the second load voltage end 420 is overcurrent, and turns on when the output current of the second load voltage end 420 is within the safe current range. This not only ensures the timely power supply of the second load voltage end 420, but also reduces the safety hazard of the low-voltage power distribution system.

[0071] In some embodiments, the first voltage can be 36V, 48V or 60V, or 72V.

[0072] In some embodiments, the second voltage can be 12V or 24V.

[0073] In some embodiments, referring to FIG. 3, the low-voltage power distribution integrated architecture further comprises a hitching terminal 320 connected with the first bidirectional DC conversion circuit 200, the hitching terminal 320 is used for accessing the externally input second voltage; the first bidirectional DC conversion circuit 200 is further used for converting the second voltage provided by the hitching terminal 320 into the first voltage and outputting the first voltage to the low-voltage battery 100 to charge the low-voltage battery 100.

[0074] In the embodiment, the hitching terminal 320 can access the external second voltage in the case of power shortage of the low-voltage battery 100, and then the first bidirectional DC conversion circuit 200 converts the second voltage provided by the hitching terminal 320 into the first voltage and outputs the first voltage to the low-voltage battery 100 to charge the low-voltage battery 100, so as to achieve the purpose of supplementing the low-voltage battery 100 in the case of power shortage of the vehicle. By such design, the portable power supply can supplement the power of the low-voltage battery 100 of the vehicle in the case of vehicle breakdown on the road, and timely meet the power supply of the key functional loads in the vehicle, thereby improving the flexibility of low-voltage supplement of the vehicle.

[0075] In some embodiments, the controller 500 is used for controlling the working state of the power distribution circuit 300 and the first bidirectional DC conversion circuit 200.

[0076] In the embodiment, by multiplexing the same controller 500 for the power distribution circuit 300 and the first bidirectional DC conversion circuit 200, the power distribution circuit 300 and the first bidirectional DC conversion circuit 200 can be integrated on the same circuit board, and the comprehensive management of voltage conversion and overcurrent protection can be realized.

[0077] In some embodiments, referring to FIG. 4, the low-voltage power distribution integrated architecture further comprises a battery management circuit 510 used for managing the charging and discharging of the low-voltage battery 100 under the control of the controller 500.

[0078] In the embodiment, the battery management circuit 510 can manage the charging and discharging of the low-voltage battery 100. The integration of the battery management circuit 510, the first bidirectional direct-current conversion circuit 200, and the power distribution circuit 300 can reduce the communication time between the battery management circuit 510 and the controller 500, so that the controller 500 can manage the battery management circuit 510, the first bidirectional direct-current conversion circuit 200, and the power distribution circuit 300 in a short time, reduce the distance of the communication cable, and facilitate the working stability of the battery management circuit 510, the first bidirectional direct-current conversion circuit 200, and the power distribution circuit 300.

[0079] In some embodiments, referring to FIG. 5, the low-voltage power distribution integrated architecture further includes an external voltage input end 520 connected with the battery management circuit 510 and at least one first load voltage end 410, and the external voltage input end 520 is configured to provide a first voltage for the battery management circuit 510 and the first load voltage end 410.

[0080] In the embodiment, the first voltage is received by the external voltage input end 520 to provide the first voltage for the battery management circuit 510 and the first load voltage end 410, so as to establish an energy transmission path between the low-voltage battery 100 and an external power supply in the low-voltage power distribution system, realize a power supply architecture with multiple power input and multiple power output, achieve the purpose of simple and flexible distribution of electric energy, and ensure stable power supply for a certain number of load voltage ends when one of the power supplies fails, thereby improving the stability and safety of the low-voltage power distribution of the vehicle.

[0081] In some embodiments, referring to FIG. 6, the low-voltage power distribution integrated architecture further includes a bidirectional switch circuit 530 connected between the external voltage input end 520 and the battery management circuit 510, and the bidirectional switch circuit 530 is configured to control the current direction between the external voltage input end 520 and the battery management circuit 510.

[0082] In the embodiment, the bidirectional switch circuit 530 can control the current direction between the external voltage input end 520 and the battery management circuit 510. In the case that the external voltage input end is connected with a power battery pack inside the vehicle, the power battery pack can supply power to the low-voltage battery 100. Moreover, when the vehicle starts, the low-voltage battery 100 can pre-charge the capacitors at both ends of the power battery pack to achieve the purpose of fast starting.

[0083] In some embodiments, referring to FIG. 7, the low-voltage power distribution integrated architecture can be integrated on a circuit board 600, which can be a single circuit board or composed of multiple circuit boards electrically spliced.

[0084] In some embodiments, the low-voltage battery 100 in the low-voltage power distribution integrated architecture can be separately arranged outside the circuit board 600 and electrically connected with the circuits integrated on the circuit board 600.

[0085] In some embodiments, as shown in FIG. 7, the first load voltage terminals 410 in the low-voltage power distribution integrated architecture can be multiple, and the low-voltage loads with relatively large power in the vehicle interior can be connected to the first load voltage terminals 410. The power distribution circuit 300 can include multiple first load switches K1, and a corresponding first load switch K1 can be arranged between a part of the first load voltage terminals 410 and the low-voltage battery 100 to control the power supply state thereof. The first load switch K1 can be controlled by the controller 500.

[0086] In some embodiments, as shown in FIG. 7, each first load switch K1 is connected in series with a current-limiting resistor R11.

[0087] In some embodiments, the current-limiting resistor R11 can be a fuse.

[0088] In some embodiments, the power distribution circuit 300 can include multiple second load switches, and the first bidirectional DC conversion circuit 200 can be connected to a part of the second load voltage terminals 420 through the second load switches.

[0089] In some embodiments, the second load voltage terminals 420 can be multiple, and the low-voltage loads with relatively small power in the vehicle interior can be connected to the second load voltage terminals 420. Since the second voltage output by the first bidirectional DC conversion circuit 200 is relatively small, the output current is relatively high at the same power. By connecting the first bidirectional DC conversion circuit 200 to the second load voltage terminals 420 through the self-recovery overcurrent protection device 310, the problem that the output current is too large due to the high power demand of the simultaneously connected use loads of the second load voltage terminals 420 can be avoided, and the safety of the low-voltage power distribution system is improved.

[0090] In some embodiments, as shown in FIG. 7, a corresponding high-side drive switch HSD1 can be arranged between a part of the first load voltage terminals 410 and the low-voltage battery 100, and a corresponding high-side drive switch HSD1 can be arranged between a part of the first load voltage terminals 410 and the external voltage input terminal 520. The power supply state of a part of the first load voltage terminals 410 is controlled by the high-side drive switch HSD1, and the high-side drive switch HSD1 can be controlled by the controller 500.

[0091] In some embodiments, as shown in FIG. 7, a high-side driver switch HSD2 can be arranged between the second load voltage terminal 420 and the first bidirectional DC conversion circuit 200, and a self-resetting over-current protection device 310 can be arranged between the second load voltage terminal 420 and the first bidirectional DC conversion circuit 200. The high-side driver switch HSD2 and the self-resetting over-current protection device 310 can be controlled by the controller 500.

[0092] In some embodiments, as shown in FIG. 7, the bidirectional switch circuit 530 can include a bidirectional switch device K2, and the bidirectional switch device K2 can be controlled by the controller 500.

[0093] In some embodiments, the bidirectional switch device K2 can be composed of two opposite MOS devices, for example, by connecting the sources of two N-type MOS devices together to form the bidirectional switch device K2.

[0094] In some embodiments, as shown in FIG. 7, the bidirectional switch circuit 530 can include a bidirectional switch device K2 and a current-limiting resistor R21, and the bidirectional switch device K2 and the current-limiting resistor R21 can be connected in series.

[0095] In some embodiments, as shown in FIG. 7, the low-voltage power distribution integrated architecture further includes a main switch K3 and a current-limiting resistor R31, and the main switch K3 and the current-limiting resistor R31 can be connected in series between the power distribution circuit 300 and the external voltage input terminal 520, and the main switch K3 can be controlled by the controller 500.

[0096] In this embodiment, the main switch K3 is controlled by the controller 500 to control the switching state between the external voltage input terminal 520 and the power distribution circuit 300.

[0097] In some embodiments, as shown in FIG. 7, the battery management circuit 510 includes a charge-discharge switch K4 and a current-limiting resistor R41, and the charge-discharge switch K4 and the current-limiting resistor R41 can be connected in series between the low-voltage battery 100 and the power distribution circuit 300.

[0098] In this embodiment, the charge-discharge switch K4 is controlled by the controller 500, and the controller 500 can control the charging of the low-voltage battery 100 by controlling the states of the charge-discharge switch K4 and the main switch K3, and can also achieve the purpose of pre-charging the pre-charging capacitor between the two poles of the vehicle's power battery pack by the low-voltage battery 100.

[0099] In some embodiments, the charge-discharge switch K4 and the main switch K3 can be bidirectional switch devices, and the working states of the charge-discharge switch K4 and the main switch K3 can be controlled by the controller 500.

[0100] In some embodiments, referring to FIG. 8, the low-voltage power distribution integrated architecture further comprises a voltage detection circuit 540 configured to detect the voltage at the common terminal of the corresponding bidirectional switch circuit 530 and generate a corresponding voltage detection signal to the controller 500 according to the detection result; the controller 500 is further configured to control the switching state of the bidirectional switch circuit 530 and determine the switching detection result according to the switching state of the bidirectional switch circuit 530 and the voltage detection signal.

[0101] In the present embodiment, the voltage at the common terminal of the corresponding bidirectional switch circuit 530 can be detected by the voltage detection circuit 540, and a corresponding voltage detection signal can be generated according to the detection result. The controller 500 can actively control the switching state of the bidirectional switch circuit 530, and sequentially determine the performance of each bidirectional switch circuit according to the switching state of the bidirectional switch circuit 530 and the voltage detection signal, thereby realizing the diagnosis of the bidirectional switch circuit 530.

[0102] In some embodiments, referring to FIG. 9, the external voltage input terminal 520 is connected to at least one first load voltage terminal 410 through the first voltage bus 110, and the battery management circuit 510 is connected to at least one first load voltage terminal 410 through the second voltage bus 120; the bidirectional switch circuit 530 comprises a first switching device 531 and a second switching device 532; the input terminals of the first switching device 531 and the second switching device 532 are connected to the first voltage bus 110 and the second voltage bus 120, respectively; the switching state of the first switching device 531 and the second switching device 532 is controlled by the controller 500, and the output terminal of the first switching device 531 and the output terminal of the second switching device 532 are connected to the voltage detection circuit 540.

[0103] In the present embodiment, the output terminal of the first switching device 531 and the output terminal of the second switching device 532 are connected to the voltage detection circuit 540. When the first switching device 531 and the second switching device 532 are in the on state, the current of the first voltage bus 110 can flow to the voltage detection circuit 540 through the first switching device 531, and the current of the second voltage bus 120 can flow to the voltage detection circuit 540 through the second switching device 532. When the controller 500 controls one of the bidirectional switch circuits 530 to perform self-detection, the controller 500 can first control the first switching device 531 and the second switching device 532 in the bidirectional switch circuit 530 to be off, and then the voltage detection circuit 540 detects the voltage at the common terminal to obtain a first voltage detection signal. Then the controller 500 can control the first switching device 531 and the second switching device 532 to be on, and the voltage detection circuit 540 detects the voltage at the common terminal to obtain a second voltage detection signal. In this way, the controller 500 can determine the performance of the bidirectional switch circuit 530 based on the first voltage detection signal and the second voltage detection signal.

[0104] In some embodiments, the bidirectional switch circuit 530 comprises two unidirectional switches, the output terminals of the two unidirectional switches are connected to the voltage detection circuit 540, and the input terminals of the two unidirectional switches are connected to the first voltage bus 110 and the second voltage bus 120 respectively.

[0105] In some embodiments, the unidirectional switch can be a MOS device.

[0106] In some embodiments, a diode is connected in parallel with each unidirectional switch, the anode of the diode is connected to the output terminal of the corresponding unidirectional switch, and the cathode of the diode is connected to the input terminal of the corresponding unidirectional switch.

[0107] In some embodiments, at least two voltage detection circuits 540 can be integrated into the same detection circuit, the voltage detection terminals of the detection circuit are connected to the voltage of the common terminals of each bidirectional switch circuit 530, and the corresponding voltage detection signals are output to the controller 500 according to the detection results. The controller 500 judges the performance of each bidirectional switch circuit 530 in turn according to the switch state of the corresponding bidirectional switch circuit 530 and the received voltage detection signals, thereby realizing the diagnosis of each bidirectional switch circuit 530.

[0108] In some embodiments, the detection circuit can connect the common terminals of the plurality of bidirectional switch circuits 530 through a plurality of voltage detection terminals.

[0109] In some embodiments, at least two voltage detection circuits 540 can be integrated into the same controller 500, the voltage detection pins of the controller 500 are connected to the voltage of the common terminals of each bidirectional switch circuit 530, and the corresponding voltage detection signals are output to the controller 500 according to the detection results. The controller 500 judges the performance of each bidirectional switch circuit 530 in turn according to the switch state of the corresponding bidirectional switch circuit 530 and the received voltage detection signals, thereby realizing the diagnosis of each bidirectional switch circuit 530.

[0110] In some embodiments, the controller 500 can connect the common terminals of the plurality of bidirectional switch circuits 530 through a plurality of voltage detection pins.

[0111] In some embodiments, referring to FIG. 10, each bidirectional switch circuit 530 comprises a first switch device 531 and a second switch device 532; the input terminals of the first switch device 531 and the second switch device 532 are connected to the first voltage bus 110 and the second voltage bus 120 respectively; the switch states of the first switch device 531 and the second switch device 532 are controlled by the controller 500, and the output terminals of the first switch device 531 and the second switch device 532 are connected to the voltage detection circuit 540.

[0112] In the embodiment, the output terminal of the first switch device 531 and the output terminal of the second switch device 532 are connected to the voltage detection circuit 540. When the first switch device 531 and the second switch device 532 are in the on state, the current of the first voltage bus 110 can flow to the voltage detection circuit 540 through the first switch device 531, and the current of the second voltage bus 120 can flow to the voltage detection circuit 540 through the second switch device 532. When the controller 500 controls one of the bidirectional switch circuits 530 to perform self-checking, the first switch device 531 and the second switch device 532 in the bidirectional switch circuit 530 can be controlled to be turned off first, and then the first switch device 531 and the second switch device 532 are turned on, and the voltage detection circuit 540 detects the voltage at the common terminal to obtain a first voltage detection signal. In this way, the controller 500 can determine the performance of the bidirectional switch circuit 530 based on the first voltage detection signal and the second voltage detection signal. At the same time, the other bidirectional switch circuits 530 work normally, and the other bidirectional switch circuits 530 can not be controlled by the controller 500, or the controller 500 controls the other bidirectional switch circuits 530 to work normally.

[0113] In some embodiments, when the controller 500 controls one of the bidirectional switch circuits 530 to perform self-checking, the first switch device 531 and the second switch device 532 in the bidirectional switch circuit 530 can be controlled to be turned on first, and then the first switch device 531 and the second switch device 532 are turned off, and the voltage detection circuit 540 detects the voltage at the common terminal to obtain a first voltage detection signal. If the voltage value of the first voltage detection signal is within a first threshold voltage range, it indicates that the bidirectional switch circuit 530 can be normally turned off. If the voltage value of the second voltage detection signal is within a second threshold voltage range, it indicates that the bidirectional switch circuit 530 can be normally turned on. In addition, the multiple bidirectional switch circuits 530 can be checked in turn. When one of the bidirectional switch circuits 530 performs the diagnosis action, the other bidirectional switch circuit 530 works normally, and the fault diagnosis of the bidirectional switch circuit 530 in the normal power supply state can be realized.

[0114] In some embodiments, the first threshold voltage range can be -0.1V-0.1V.

[0115] In the embodiment, when the controller 500 controls the first switch device 531 and the second switch device 532 to be off, the voltage detection circuit 540 detects the voltage at the common terminal to obtain a first voltage detection signal. If the voltage of the first voltage detection signal is 0V, it indicates that the bidirectional switch circuit 530 can be normally turned off. If the voltage of the first voltage detection signal is not within a first threshold voltage range, for example, the voltage of the first voltage detection signal is 5V or 12V, it indicates that the bidirectional switch circuit 530 cannot be normally turned off.

[0116] In some embodiments, the second threshold voltage range can be determined by the voltage range of the first voltage bus 110 and the second voltage bus 120. For example, the second threshold voltage range can be 11.5V-12.5V, and the second threshold voltage range can also be 23.5V-24.5V.

[0117] In the embodiment, when the controller 500 controls the first switch device 531 and the second switch device 532 to be on, the voltage detection circuit 540 detects the voltage at the common terminal to obtain a second voltage detection signal. If the voltage of the second voltage detection signal is 12V, it indicates that the bidirectional switch circuit 530 can be normally turned on. If the voltage of the second voltage detection signal is not within a second threshold voltage range, for example, the voltage of the first voltage detection signal is 5V, it indicates that the bidirectional switch circuit 530 cannot be normally turned on.

[0118] In some embodiments, when the controller 500 controls the first switch device 531 and the second switch device 532 to be on, the controller 500 can control the first switch device 531 and the second switch device 532 to be on in turn, so as to separately detect the on performance of the first switch device 531 and the second switch device 532. In the case that the first switch device 531 is on, if the voltage of the second voltage detection signal detected by the voltage detection circuit 540 at the common terminal is inconsistent with the voltage of the first voltage bus 110, it indicates that the first switch device 531 is abnormally on. If the voltage of the second voltage detection signal detected by the voltage detection circuit 540 at the common terminal is consistent with the voltage of the first voltage bus 110, it indicates that the first switch device 531 can be normally turned on.

[0119] In the embodiment, if the difference between the voltage of the second voltage detection signal and the voltage of the first voltage bus 110 is less than a first threshold voltage, it indicates that the voltage of the second voltage detection signal is consistent with the voltage of the first voltage bus 110. The first threshold voltage is related to the voltage drop of the first switch device 531. For example, if the difference between the voltage of the second voltage detection signal and the voltage of the first voltage bus 110 is less than 0.7V, it indicates that the voltage of the second voltage detection signal is consistent with the voltage of the first voltage bus 110.

[0120] In some embodiments, when the second switch device 532 is turned on, if the voltage detection circuit 540 detects that the voltage at the common terminal is inconsistent with the voltage of the second voltage bus 120, it indicates that the second switch device 532 is abnormally turned on. If the voltage detection circuit 540 detects that the voltage at the common terminal is consistent with the voltage of the second voltage bus 120, it indicates that the second switch device 532 can be normally turned on.

[0121] In the embodiment, when the difference between the voltage of the second voltage detection signal and the voltage of the second voltage bus 120 is less than the second threshold voltage, it can be indicated that the voltage of the second voltage detection signal is consistent with the voltage of the second voltage bus 120. The second threshold voltage is related to the voltage drop of the second switch device 532. For example, when the difference between the voltage of the second voltage detection signal and the voltage of the second voltage bus 120 is less than 0.7V, it can be indicated that the voltage of the second voltage detection signal is consistent with the voltage of the second voltage bus 120.

[0122] In some embodiments, referring to FIG. 10, each voltage detection circuit 540 includes a voltage dividing resistor device 541, the first end of the voltage dividing resistor device 541 is connected to the common terminal of the bidirectional switch circuit 530, and the second end of the voltage dividing resistor device 541 is grounded.

[0123] In the embodiment, the voltage dividing resistor device 541 is connected in series to the common terminal of the bidirectional switch circuit 530, so that the output terminal of the first switch device 531 and the output terminal of the second switch device 532 are connected to the voltage detection circuit 540. When the first switch device 531 and the second switch device 532 are in the on state, the current of the first voltage bus 110 can flow to the voltage detection circuit 540 through the first switch device 531, and the current of the second voltage bus 120 can flow to the voltage detection circuit 540 through the second switch device 532. When the controller 500 controls one of the bidirectional switch circuits 530 to perform self-checking, the controller 500 can first control the first switch device 531 and the second switch device 532 in the bidirectional switch circuit 530 to be turned off, so that the voltage detection circuit 540 detects the voltage at the common terminal to obtain the first voltage detection signal. Then the controller 500 can control the first switch device 531 and the second switch device 532 to be turned on, so that the voltage detection circuit 540 detects the voltage at the common terminal to obtain the second voltage detection signal. In this way, the controller 500 can determine the performance of the bidirectional switch circuit 530 based on the first voltage detection signal and the second voltage detection signal. At the same time, the other bidirectional switch circuits 530 are working normally, and the other bidirectional switch circuits 530 can not be controlled by the controller 500, or the controller 500 controls the other bidirectional switch circuits 530 to work normally.

[0124] In some embodiments, referring to FIG. 11, each voltage detection circuit 540 comprises a detection switch device 542 connected in series with a voltage dividing resistor device 541.

[0125] In the present embodiment, the start of the voltage detection circuit 540 can be controlled by the detection switch device 542, since the detection switch device 542 is connected in series with the voltage dividing resistor device 541, when the detection switch device 542 is off, the voltage dividing resistor device 541 cannot form a loop, thus, the bidirectional switch circuit 530 can be turned off when it is working in the non-self-checking mode, so as to reduce the static current and achieve the purpose of reducing the power consumption of the circuit.

[0126] In some embodiments, the switching state of the detection switch device 542 is controlled by the controller 500.

[0127] In the present embodiment, the switching state of the detection switch device 542 is controlled by the controller 500, the controller 500 can control the corresponding detection switch device 542 to be turned on according to the user's demand, further control the corresponding bidirectional switch circuit 530 to be turned on or off, detect the voltage at the common terminal of the corresponding bidirectional switch circuit 530 by the voltage detection circuit 540, and generate the corresponding voltage detection signal according to the detection result, the controller 500 can actively control the switching state of at least two bidirectional switch circuits 530, and judge the performance of each bidirectional switch circuit 530 according to the switching state of the at least two bidirectional switch circuits 530 and the voltage detection signal, so as to realize the diagnosis of each bidirectional switch circuit 530, and when one of the bidirectional switch circuits 530 is performing the diagnosis action, the other bidirectional switch circuit 530 is working normally, so as to realize the fault diagnosis of the bidirectional switch circuit 530 in the normal power supply state of the circuit.

[0128] In some embodiments, referring to FIG. 12, the first switch device 531 comprises a first MOS tube Q1, and the second switch device 532 comprises a second MOS tube Q2. The drain of the first MOS tube Q1 is connected to the first voltage bus 110, the source of the first MOS tube Q1 and the source of the second MOS tube Q2 are connected to the corresponding voltage detection circuit 540, and the drain of the second MOS tube Q2 is connected to the second voltage bus 120; the switching state of the first MOS tube Q1 and the second MOS tube Q2 is controlled by the controller 500.

[0129] In the embodiment, the first MOS Q1 and the second MOS Q2 are arranged back to back, the source of the first MOS Q1 and the second MOS Q2 are connected, and the anode of the parasitic diode in the first MOS Q1 and the second MOS Q2 are connected. When the first MOS Q1 and the second MOS Q2 are controlled to be turned off by the controller 500, if the voltage detection circuit 540 detects that the voltage of the source of the first MOS Q1 and the second MOS Q2 is in the first threshold voltage range, it can be judged that the first MOS Q1 and the second MOS Q2 can be normally turned off.

[0130] In some embodiments, referring to FIG. 12, the voltage dividing resistor 541 includes a first resistor R1 connected between the common end of the corresponding bidirectional switch circuit 530 and the ground.

[0131] In some embodiments, referring to FIG. 12, the detection switch device 542 includes a first switch K1 connected in series with the voltage dividing resistor 541.

[0132] In the embodiment, the first switch K1 can be connected between the common end of the bidirectional switch circuit 530 and the voltage dividing resistor 541, or can be connected between the voltage dividing resistor 541 and the ground.

[0133] In some embodiments, referring to FIG. 13, the bidirectional switch circuit 530 connected between the first voltage bus 110 and the second voltage bus 120 can be multiple, each bidirectional switch circuit 530 is connected between the first voltage bus 110 and the second voltage bus 120, and each voltage detection circuit 540 is connected to the common end of at least one bidirectional switch circuit 530. The voltage detection circuit 540 is used to detect the voltage of the common end of the corresponding bidirectional switch circuit 530, and generate a corresponding voltage detection signal according to the detection result. The controller 500 is connected to the bidirectional switch circuit 530 and the voltage detection circuit 540, and the controller 500 is used to control the switching state of the bidirectional switch circuit 530, and determine the switching detection result according to the switching state of the bidirectional switch circuit 530 and the voltage detection signal.

[0134] In the embodiment, each bidirectional switch circuit 530 is connected between the first voltage bus 110 and the second voltage bus 120, and each voltage detection circuit 540 is connected to the common end of at least one bidirectional switch circuit 530. The voltage detection circuit 540 is used to detect the voltage of the common end of the corresponding bidirectional switch circuit 530, and generate a corresponding voltage detection signal according to the detection result. The controller 500 can actively control the switching state of at least two bidirectional switch circuits 530, and judge the performance of each bidirectional switch circuit 530 according to the switching state of at least two bidirectional switch circuits 530 and the voltage detection signal, thereby realizing the diagnosis of each bidirectional switch circuit 530.

[0135] For example, when one of the bidirectional switching circuits 530 is operating in diagnostic mode, the corresponding voltage detection circuit 540 can detect the voltage at the common terminal of the bidirectional switching circuit 530 when the circuit is disconnected, and generate a corresponding first voltage detection signal based on the detection result. If the voltage value of the first voltage detection signal is within the first threshold voltage range, it indicates that the bidirectional switching circuit 530 can be disconnected normally. When the bidirectional switching circuit 530 is on, the corresponding voltage detection circuit 540 detects the voltage at the common terminal of the circuit, and generates a corresponding second voltage detection signal based on the detection result. If the voltage value of the second voltage detection signal is within the second threshold voltage range, it indicates that the bidirectional switching circuit 530 can be on normally. Furthermore, multiple bidirectional switching circuits 530 can perform self-tests in turn. When one bidirectional switching circuit 530 performs a diagnostic action, another bidirectional switching circuit 530 operates normally, enabling fault diagnosis of the bidirectional switching circuits 530 under normal power supply conditions.

[0136] In some embodiments, the first voltage bus 110 is connected to a portion of the first load voltage terminal 410 via a first load switch circuit.

[0137] In some embodiments, the second voltage bus 120 is connected to another portion of the first load voltage terminal 410 via a second load switch circuit.

[0138] In this embodiment, the first voltage bus 110 can be connected to the first load voltage terminal 410 via the first load switch circuit, and supply power to the connected first load via the first load voltage terminal 410. The second voltage bus 120 is connected to the first load voltage terminal 410 via the second load switch circuit, and supply power to the connected second load via the first load voltage terminal 410. The switching state of the first load switch circuit and the second load switch circuit can be controlled according to the voltage of the first voltage bus 110 and the second voltage bus 120, so as to avoid the problem of damage to the connected load caused by the instability of the voltage of the first voltage bus 110 and the second voltage bus 120.

[0139] In some embodiments, the controller 500 is further configured to control up to one bidirectional switching circuit 530 to operate in diagnostic mode; the voltage detection circuit 540 is further configured to detect the voltage at the common terminal of the bidirectional switching circuit 530 when the bidirectional switching circuit 530 is operating in diagnostic mode, and generate a corresponding voltage detection signal to be output to the controller 500 based on the detection result.

[0140] In the embodiment, the controller 500 can control at most one bidirectional switch circuit 530 in the diagnostic mode and the others in the non-diagnostic mode at the same time. The bidirectional switch circuit 530 in the diagnostic mode can be turned on and off in sequence. The voltage at the common terminal of the bidirectional switch circuit 530 is detected by the corresponding voltage detection circuit 540, and the voltage detection signal is generated according to the detection result. The controller 500 judges the performance of the bidirectional switch circuit 530 in the diagnostic mode according to the switching state of the bidirectional switch circuit 530 and the voltage detection signal, realizes the diagnosis of the bidirectional switch circuit 530, and when one bidirectional switch circuit 530 performs the diagnostic action, the others work in the non-diagnostic mode. Since the other bidirectional switch circuits 530 can work normally, it will not affect the connection control between the first voltage bus 110 and the second voltage bus 120, and the fault diagnosis of the bidirectional switch circuit 530 in the normal power supply state of the circuit can be realized.

[0141] In some embodiments, the controller 500 is further configured to control the first switch device 531 and the second switch device 532 in one bidirectional switch circuit 530 to be turned on at the same time in the diagnostic mode, and then control the first switch device 531 and the second switch device 532 in the other bidirectional switch circuit 530 to be turned off at the same time.

[0142] In some embodiments, when the controller 500 controls one bidirectional switch circuit 530 to perform self-checking, the first switch device 531 and the second switch device 532 in the bidirectional switch circuit 530 can be controlled to be turned on first, and then the voltage detection circuit 540 detects the voltage at the common terminal to obtain the second voltage detection signal. Then the first switch device 531 and the second switch device 532 can be controlled to be turned off, and then the voltage detection circuit 540 detects the voltage at the common terminal to obtain the first voltage detection signal. If the voltage value of the first voltage detection signal is within the first threshold voltage range, it indicates that the bidirectional switch circuit 530 can be normally turned off. If the voltage value of the second voltage detection signal is within the second threshold voltage range, it indicates that the bidirectional switch circuit 530 can be normally turned on. The multiple bidirectional switch circuits 530 can be checked in turn, and when one bidirectional switch circuit 530 performs the diagnostic action, the other bidirectional switch circuit 530 works normally, and the fault diagnosis of the bidirectional switch circuit 530 in the normal power supply state of the circuit can be realized.

[0143] In some embodiments, the controller 500 is further configured to control the first switch device 531 and the second switch device 532 in one bidirectional switch circuit 530 in the diagnostic mode to be turned off at the same time, and then control the first switch device 531 and the second switch device 532 to be turned on at the same time.

[0144] In the embodiment, the output end of the first switch device 531 and the output end of the second switch device 532 are connected to the voltage detection circuit 540. When the first switch device 531 and the second switch device 532 are in the on state, the current of the first voltage bus 110 can flow to the voltage detection circuit 540 through the first switch device 531, and the current of the second voltage bus 120 can flow to the voltage detection circuit 540 through the second switch device 532. When the controller 500 controls one of the bidirectional switch circuits 530 to perform self-checking, the first switch device 531 and the second switch device 532 in the bidirectional switch circuit 530 can be controlled to be disconnected first, and then the first switch device 531 and the second switch device 532 are controlled to be turned on. The voltage detection circuit 540 detects the voltage at the common end to obtain a first voltage detection signal, and then the voltage detection circuit 540 detects the voltage at the common end to obtain a second voltage detection signal. In this way, the controller 500 can determine the performance of the bidirectional switch circuit 530 based on the first voltage detection signal and the second voltage detection signal. At the same time, the other bidirectional switch circuits 530 work normally, and the other bidirectional switch circuits 530 can not be controlled by the controller 500, or the controller 500 controls the other bidirectional switch circuits 530 to work normally.

[0145] In some embodiments, the voltage detection circuit 540 detects the voltage at the common end of the first switch device 531 and the second switch device 532 to obtain a first voltage detection signal when the first switch device 531 and the second switch device 532 are both off; the voltage detection circuit 540 detects the voltage at the common end of the first switch device 531 and the second switch device 532 to obtain a second voltage detection signal when the first switch device 531 and the second switch device 532 are both on; and the controller 500 is further configured to determine that the first switch device 531 and the second switch device 532 are normal when the voltage value of the first voltage detection signal is within a first threshold voltage range and the voltage value of the second voltage detection signal is within a second threshold voltage range.

[0146] In the embodiment, the output terminal of the first switch device 531 is connected with the output terminal of the second switch device 532 at the voltage detection circuit 540. When the first switch device 531 and the second switch device 532 are in the on state, the current of the first voltage bus 110 can flow to the voltage detection circuit 540 through the first switch device 531, and the current of the second voltage bus 120 can flow to the voltage detection circuit 540 through the second switch device 532. When the controller 500 controls one of the bidirectional switch circuits 530 to perform self-checking, the first switch device 531 and the second switch device 532 in the bidirectional switch circuit 530 can be controlled to be turned off first. The voltage detection circuit 540 detects the voltage at the common terminal to obtain a first voltage detection signal. If the voltage of the first voltage detection signal is within the first threshold voltage range, it indicates that the first switch device 531 and the second switch device 532 can be normally turned off. Then the first switch device 531 and the second switch device 532 can be controlled to be turned on. The voltage detection circuit 540 detects the voltage at the common terminal to obtain a second voltage detection signal. If the voltage of the second voltage detection signal is within the second threshold voltage range, it indicates that the first switch device 531 and the second switch device 532 can be normally turned on. In this way, the controller 500 can judge the performance of the bidirectional switch circuit 530 based on the first voltage detection signal and the second voltage detection signal. In addition, the other bidirectional switch circuits work in the non-diagnostic mode. Since the other bidirectional switch circuits 530 can work normally, the connection control between the first voltage bus 110 and the second voltage bus 120 is not affected, and the fault diagnosis of the bidirectional switch circuit 530 in the normal power supply state of the circuit can be realized.

[0147] In some embodiments, the detection switch device 542 is also used to turn off when the corresponding bidirectional switch circuit 530 exits the diagnostic mode.

[0148] In the embodiment, the start of the voltage detection circuit 540 can be controlled by the detection switch device 542. Since the detection switch device 542 is connected in series with the voltage dividing resistor device 541, when the detection switch device 542 is turned off, the voltage dividing resistor device 541 cannot form a loop. Therefore, the detection switch device 542 can be turned off when the bidirectional switch circuit 530 works in the non-self-checking mode, so as to reduce the static current and achieve the purpose of reducing the power consumption of the circuit.

[0149] In some embodiments, the first bidirectional direct current conversion circuit 200 includes an interleaved BUCK circuit.

[0150] In the embodiment, the interleaved BUCK circuit can be a multi-path parallel buck-boost converter composed of multiple identical BUCK circuit modules. The on-time of the switch tube of each BUCK circuit is determined according to the input voltage and the output voltage to achieve a stable output voltage. When the input voltage is applied to the interleaved BUCK circuit, the first BUCK circuit starts to work, the switch tube is turned on, the inductor stores a part of energy, and the output voltage is stabilized. At the same time, the switch tube of the second BUCK circuit is in an off state and does not participate in energy conversion. With the passage of time, the switch tube of the first BUCK circuit is turned off, and the switch tube of the second BUCK circuit starts to conduct, and its inductor also stores a part of energy, and the output voltage continues to be stabilized. At the same time, the switch tube of the first BUCK circuit is in an off state and does not participate in energy conversion. In this way, multiple BUCK circuit modules work in an interleaved manner to realize a high-efficiency, low-ripple, and high-power output buck-boost conversion. In this way, the current can be reduced, the power loss can be reduced, the voltage conversion efficiency and the stability of the output voltage can be improved, and the demand of high-power applications can be met.

[0151] In some embodiments, the self-restoring overcurrent protection device 310 can include an electronic fuse.

[0152] In the embodiment, the overcurrent threshold of the electronic fuse can be set by the controller 500.

[0153] The embodiments of the present application also provide a power distribution system, which includes the low-voltage power distribution integrated architecture according to any one of the above embodiments.

[0154] The embodiments of the present application also provide a vehicle, which includes a first voltage bus 110 and a second voltage bus 120, and the low-voltage power distribution integrated architecture according to any one of the above embodiments.

[0155] In some embodiments, the vehicle further includes a power battery pack, the power battery pack is connected to the external voltage input end 520 via the DCDC circuit, the external voltage input end 520 is connected to the at least one first load voltage end 410 via the first voltage bus 110, and the battery management circuit 510 is connected to the at least one first load voltage end 410 via the second voltage bus 120.

[0156] In the embodiment, the first voltage output by the low-voltage battery 100 in the vehicle is output to the first load voltage terminal 410, and the first bidirectional direct-current conversion circuit 200 converts the first voltage output by the low-voltage battery 100 into a second voltage and outputs the second voltage to the second load voltage terminal 420, so that when the vehicle is configured with a high-power load, the first load voltage terminal 410 with a higher output voltage can provide power for the load, the output current of the low-voltage power distribution system can be greatly reduced under the same power, and the problem of too large current of the current automobile 12V power supply and too large size of the connector due to too large diameter of the wire harness can be solved. Moreover, the self-recovery overcurrent protection device 310 is used to turn off the power supply of the second load voltage terminal 420 when the output current of the second load voltage terminal 420 is overcurrent, and turn on when the output current of the second load voltage terminal 420 is within a safe current range, so as to not only ensure the timely power supply of the second load voltage terminal 420, but also reduce the safety hazard of the low-voltage power distribution system.

[0157] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional unit and module is exemplified, and in actual application, the above-mentioned 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 exist physically, 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 repeated here.

[0158] 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.

[0159] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the electronic device embodiments described above are only schematic. For example, the division of modules or units is only a logical function division, and actual implementation can have another division manner, 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 coupling or direct coupling or communication connection between the displayed or discussed each other can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0160] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0161] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0162] The above embodiments are only used to illustrate the technical solutions of the present application, but not to 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 the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; 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 power distribution integrated architecture, wherein, The low-voltage power distribution integrated architecture comprises: a low-voltage battery for providing a first voltage; a first bidirectional DC conversion circuit for realizing conversion between the first voltage and a second voltage; a power distribution circuit connected with the first bidirectional DC conversion circuit and the low-voltage battery, for supplying power to a first load voltage terminal and / or a second load voltage terminal according to the received first voltage and second voltage; the power distribution circuit, the low-voltage battery and the first bidirectional DC conversion circuit are controlled by a same controller.

2. The low voltage power distribution integrated architecture of claim 1, wherein, The power distribution circuit comprises: one or more self-recovery over-current protection devices connected between the first bidirectional DC conversion circuit and the second load voltage terminal, at least one of the self-recovery over-current protection devices is controlled by the controller to turn off the power supply of the second load voltage terminal when the output current of the second load voltage terminal is over current.

3. The low voltage power distribution integrated architecture of claim 1 or 2, wherein, The power distribution circuit further comprises: a power-on terminal connected with the first bidirectional DC conversion circuit, for accessing an externally input second voltage; the first bidirectional DC conversion circuit is further used for converting the second voltage provided by the power-on terminal into the first voltage and outputting the first voltage to the low-voltage battery, so as to charge the low-voltage battery.

4. The low voltage power distribution integrated architecture of claim 1, wherein, The low-voltage power distribution integrated architecture further comprises: a battery management circuit controlled by the controller, for managing charging and discharging of the low-voltage battery.

5. The low voltage power distribution integrated architecture of any of claims 1-4, wherein, The low-voltage power distribution integrated architecture further comprises: an external voltage input terminal connected with the battery management circuit and the power distribution circuit, for providing the first voltage for the battery management circuit and the power distribution circuit.

6. The low voltage power distribution integrated architecture of claim 5, wherein, The low-voltage power distribution integrated architecture further comprises: a bidirectional switch circuit connected between the external voltage input terminal and the battery management circuit, for controlling the current direction between the external voltage input terminal and the battery management circuit.

7. The low voltage power distribution integrated architecture of claim 6, wherein, The low-voltage power distribution integrated architecture further comprises: a voltage detection circuit for detecting the voltage of the common terminal of the corresponding bidirectional switch circuit and outputting a corresponding voltage detection signal to the controller according to the detection result; the controller is further used for controlling the switching state of the bidirectional switch circuit and determining a switching detection result according to the switching state of the bidirectional switch circuit and the voltage detection signal.

8. The low voltage power distribution integrated architecture of claim 7, wherein, The bidirectional switch circuit comprises: a first switch device and a second switch device; the input terminals of the first switch device and the second switch device are respectively connected with a first voltage bus and a second voltage bus; the external voltage input terminal is connected with at least one first load voltage terminal through the first voltage bus, and the battery management circuit is connected with at least one first load voltage terminal through the second voltage bus; the switching states of the first switch device and the second switch device are controlled by the controller, and the output terminals of the first switch device and the second switch device are connected with the voltage detection circuit.

9. The low voltage power distribution integrated architecture of any of claims 1-8, wherein, The first bidirectional DC conversion circuit comprises an interleaved BUCK circuit.

10. The low voltage power distribution integrated architecture of any of claims 1-8, wherein, The self-recovery over-current protection device comprises an electronic fuse.

11. A power distribution system wherein, The low-voltage power distribution integrated architecture comprises:

12. A vehicle, wherein, a first voltage bus and a second voltage bus; and the low-voltage power distribution integrated architecture comprises: a first voltage bus and a second voltage bus; and the low-voltage power distribution integrated architecture comprises:

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