Low-voltage power distribution framework, power distribution system and vehicle

Abstract

The utility model discloses a low-voltage power distribution framework, a power distribution system and a vehicle, at least two switch circuits are arranged at a low-voltage battery and a load end, a switch driving circuit is connected with the at least two switch circuits, and the switch driving circuit is controlled by a main control circuit and controls the on-off state of the at least two switch circuits, so that a redundant switch is added; the problem that the load end is powered off when one switching circuit fails can be avoided, and the power supply stability and reliability of the low-voltage battery are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a low-voltage power distribution architecture, a power distribution system and a vehicle. BACKGROUND

[0002] In the power distribution system, the load control and protection of the battery are usually only performed by the battery management system (BMS).

[0003] However, in the related art, the positive control of the lithium battery is usually only provided with one control chip, and if the control chip fails, the whole vehicle battery will be powered off, which has a serious negative impact on the driving of the vehicle. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems, the present application provides a low-voltage power distribution architecture, a power distribution system and a vehicle, aiming to solve the problem of insufficient reliability of the low-voltage power distribution system in the related vehicle.

[0005] The first aspect of the embodiment of the present application provides a low-voltage power distribution architecture, which comprises a low-voltage battery, at least two switch circuits, a switch driving circuit and a master control circuit.

[0006] The low-voltage battery is connected to the load end through the at least two switch circuits.

[0007] The switch driving circuit is connected to the switch circuit, and the switch driving circuit is controlled by the master control circuit to control the switching state of the at least two switch circuits.

[0008] In the technical solution of the embodiment of the present application, at least two switch circuits are arranged between the low-voltage battery and the load end, the switch driving circuit is connected to the at least two switch circuits, the switch driving circuit is controlled by the master control circuit, and the switching state of the at least two switch circuits is controlled, so that one redundant switch is added, the problem of power failure of the load end when one of the switch circuits fails can be avoided, and the power supply stability and reliability of the low-voltage power distribution architecture are improved.

[0009] In some embodiments, the at least two switch circuits comprise:

[0010] The first switch circuit is connected between the positive electrode of the low-voltage battery and the positive electrode of the load end.

[0011] The second switch circuit is connected between the positive electrode of the low-voltage battery and the positive electrode of the load end.

[0012] The first switch circuit and the second switch circuit are controlled by the switch driving circuit.

[0013] In the technical solution of the embodiment of the application, the first switch circuit and the second switch circuit in parallel are formed by arranging the first switch circuit between the positive electrode of the low-voltage battery and the positive electrode of the load terminal and arranging the second switch circuit between the positive electrode of the low-voltage battery and the positive electrode of the load terminal. The types of the first switch circuit and the second switch circuit can be set according to the application scene requirements. By adding a group of positive electrode switches of different switch types, when one group of switches fails, the other group of switches can be turned on, without affecting the power-on of the power supply terminal, avoiding the problem of power-off of the load terminal when one of the switch circuits fails, and improving the power supply stability and reliability of the low-voltage power distribution architecture.

[0014] In some embodiments, the switch driving circuit includes at least two sub-switch driving circuits, and the at least two sub-switch driving circuits are connected in one-to-one correspondence with the at least two switch circuits.

[0015] The at least two sub-switch driving circuits are controlled by the master control circuit to control the switch state of the at least two switch circuits.

[0016] In the technical solution of the embodiment of the application, the corresponding switch driving circuit is arranged for each switch circuit, and each switch driving circuit is controlled by the master control circuit. By adding a group of positive electrode switches of different switch types, when one group of switches fails, the other group of switches can be turned on, without affecting the power-on of the power supply terminal. When any one of the switch driving circuits fails, the other switch driving circuit can drive the corresponding switch circuit to turn on in time, avoiding the problem of power-off of the load terminal when one of the positive electrode switches fails, and improving the power supply stability and reliability of the low-voltage power distribution architecture.

[0017] In some embodiments, the master control circuit is configured to control at least one switch circuit to turn on in the case of power-on of the load terminal.

[0018] In the technical solution of the embodiment of the application, the low-voltage battery and the load terminal are provided with at least two switch circuits. In the case of power-on of the load terminal, at least one switch circuit can be controlled to turn on, realizing the power supply control of the load terminal. The positive electrode switches of the two switch circuits can be power switches of different batches or different manufacturers. In this way, the problem of simultaneous failure of power switches of the same batch under the same working condition can be avoided, and the stability of the low-voltage power distribution architecture is improved. Moreover, since the low-voltage battery is in a preset voltage range, when the required power of the load terminal increases, the current of the low-voltage battery increases. By arranging multiple switch circuits to turn on, the current flowing through each switch circuit will not be too large when a large power is output, which not only plays a role of redundant switch, but also reduces the current flowing through each switch circuit, achieves the effect of reducing the heat of the switch circuit, and avoids the problem of power-off of the load terminal when one of the positive electrode switches fails, improving the power supply stability and reliability of the low-voltage power distribution architecture.

[0019] In some embodiments, the master control circuit is configured to control the at least two switch circuits to be turned on alternately in the case of powering on the load end.

[0020] In the technical solution of the embodiments of the present application, at least two switch circuits are arranged between the low-voltage battery and the load end. In the case of powering on the load end, the at least two switch circuits can be controlled to be turned on alternately, so as to realize the power supply control of the load end. In this way, one of the switch circuits is turned on while the other is turned off, thereby increasing the service life of the positive switch.

[0021] In some embodiments, the switch circuit comprises a bidirectional switch tube, the first end and the second end of the bidirectional switch tube are connected to the positive pole of the low-voltage battery and the positive pole of the load end respectively, and the control end of the bidirectional switch tube is connected to the switch driving circuit.

[0022] In the technical solution of the embodiments of the present application, the first end and the second end of the bidirectional switch tube are connected to the positive pole of the low-voltage battery and the positive pole of the load end respectively, and the control end of the bidirectional switch tube is connected to the switch driving circuit. The switch driving circuit can control the conduction direction of the bidirectional switch tube. In the case of charging the low-voltage battery, the load end can be connected to an external power supply to charge the low-voltage battery. In the case of supplying power to the load end by the low-voltage battery, the low-voltage battery can output current to the load end through the bidirectional switch tube, thereby realizing the charging and discharging control of the low-voltage battery.

[0023] In some embodiments, the low-voltage power distribution architecture further comprises at least two current sampling circuits.

[0024] The at least two current sampling circuits are connected in series, and the at least two current sampling circuits sample the current of the low-voltage battery to obtain corresponding current sampling signals and output the current sampling signals to the master control circuit.

[0025] In the technical solution of the embodiments of the present application, the two current sampling circuits are arranged to sample the current of the low-voltage battery to obtain corresponding current sampling signals and output the current sampling signals to the master control circuit. The reliability of the current sampling of the low-voltage battery in extreme conditions can be improved, and the stability and reliability of the power supply of the low-voltage power distribution architecture are ensured.

[0026] In some embodiments, the at least two current sampling circuits comprise a first current sampling circuit and a second current sampling circuit.

[0027] The first current sampling circuit samples the current of the low-voltage battery to obtain a first current sampling signal, and the second current sampling circuit samples the current of the low-voltage battery to obtain a second current sampling signal.

[0028] The master control circuit controls the switching state of the at least two switch circuits according to the first current sampling signal and the second current sampling signal.

[0029] In the technical scheme of the embodiment of the application, the first current sampling circuit samples the current of the low-voltage battery to obtain a first current sampling signal output to the main control circuit, and the second current sampling circuit samples the current of the low-voltage battery to obtain a second current sampling signal output to the main control circuit. The main control circuit controls the switching state of the at least two switching circuits according to the first current sampling signal and the second current sampling signal, so that the power-on state of the load end can be monitored in real time according to the loop current of the low-voltage battery, and when the power-off state of the load end occurs, all the switching circuits can be turned on by the main control circuit in time, thereby ensuring the power-on stability of the load end, improving the reliability of current sampling of the low-voltage battery in an extreme case, and improving the power supply stability and reliability of the low-voltage power distribution architecture.

[0030] In some embodiments, the sampling periods of the first current sampling circuit and the second current sampling circuit are different.

[0031] In the technical scheme of the embodiment of the application, the first current sampling circuit samples the current of the low-voltage battery to obtain a first current sampling signal output to the main control circuit, and the second current sampling circuit samples the current of the low-voltage battery to obtain a second current sampling signal output to the main control circuit. The first current sampling circuit can sample the loop current of the low-voltage battery according to a smaller sampling period, and the second current sampling circuit can sample the loop current of the low-voltage battery according to a larger sampling period, so that the loop current of the low-voltage battery can be sampled according to the corresponding sampling period according to the application scenario, thereby achieving the purpose of reducing sampling power consumption. The first current sampling circuit and the second current sampling circuit can also sample the loop current of the low-voltage battery at the same time, the main control circuit controls the switching state of the at least two switching circuits according to the first current sampling signal and the second current sampling signal, realizes current monitoring of large and small periods, improves the accuracy of current sampling, and can monitor the power-on state of the load end in real time according to the loop current of the low-voltage battery. When the power-off state of the load end occurs, all the switching circuits can be turned on by the main control circuit in time, thereby ensuring the power-on stability of the load end, improving the reliability of current sampling of the low-voltage battery in an extreme case, and improving the power supply stability and reliability of the low-voltage power distribution architecture.

[0032] In some embodiments, the main control circuit verifies the second current sampling signal according to the first current sampling signal, and / or

[0033] The main control circuit verifies the first current sampling signal according to the second current sampling signal.

[0034] In the technical solution of the embodiment of the application, the main control circuit can verify the first current sampling circuit and the second current sampling circuit according to the first current sampling signal and the second current sampling signal, so as to ensure the reliability of the collected current data. The main control circuit controls the switching state of the at least two switching circuits according to the first current sampling signal and the second current sampling signal, so as to avoid sampling errors of one of the current sampling circuits and improve the accuracy of current sampling. In addition, the main control circuit can monitor the power-on state of the load end in real time according to the loop current of the low-voltage battery. When the load end is powered off, the main control circuit can turn on all the switching circuits in time, so as to ensure the power-on stability of the load end. The reliability of current sampling of the low-voltage battery in an extreme case is improved, and the power supply stability and reliability of the low-voltage power distribution architecture are also improved.

[0035] In some embodiments, the first current sampling circuit and the second current sampling circuit are controlled by the main control circuit to alternately sample the current of the low-voltage battery.

[0036] In the technical solution of the embodiment of the application, the first current sampling circuit and the second current sampling circuit are controlled by the main control circuit to alternately sample the current of the low-voltage battery. One of the current sampling circuits rests while the other one performs current sampling. The main control circuit can verify the first current sampling circuit and the second current sampling circuit according to the first current sampling signal and the second current sampling signal, so as to avoid a large difference between the sampling values of the current in two adjacent sampling periods and ensure the reliability of the collected current data. The main control circuit controls the switching state of the at least two switching circuits according to the first current sampling signal and the second current sampling signal, so as to avoid sampling errors of one of the current sampling circuits and improve the accuracy of current sampling. In addition, the main control circuit can monitor the power-on state of the load end in real time according to the loop current of the low-voltage battery. When the load end is powered off, the main control circuit can turn on all the switching circuits in time, so as to ensure the power-on stability of the load end. The reliability of current sampling of the low-voltage battery in an extreme case is improved, and the power supply stability and reliability of the low-voltage power distribution architecture are also improved.

[0037] In some embodiments, the first current sampling circuit is connected between the positive electrode of the low-voltage battery and the positive electrode of the load end, and the second current sampling circuit is connected between the negative electrode of the low-voltage battery and the negative electrode of the load end.

[0038] In the technical solution of the embodiment of the application, the first current sampling circuit samples the current between the positive pole of the low-voltage battery and the positive pole of the load end to obtain a first current sampling signal, and the second current sampling circuit samples the current between the negative pole of the low-voltage battery and the negative pole of the load end to obtain a second current sampling signal. In this way, the current at different positions of the loop of the low-voltage battery can be sampled, which is beneficial to the reliability of the current sampling data. The master control circuit controls the switching state of the at least two switching circuits according to the first current sampling signal and the second current sampling signal, so as to avoid sampling errors of one of the current sampling circuits and improve the accuracy of current sampling. In addition, the power-on state of the load end can be monitored in real time according to the loop current of the low-voltage battery. When the load end is powered off, all the switching circuits can be turned on by the master control circuit in time, so as to ensure the power-on stability of the load end. The reliability of current sampling of the low-voltage battery in an extreme situation is improved, and the power supply stability and reliability of the low-voltage power distribution architecture are also improved.

[0039] In some embodiments, the current sampling circuit includes an analog front-end chip and a sampling resistor. The sampling resistor is connected in series with the low-voltage battery, and the analog front-end chip generates a corresponding current sampling signal according to the voltage signal across the sampling resistor and outputs the signal to the master control circuit.

[0040] In the technical solution of the embodiment of the application, the sampling resistor is connected in series with the low-voltage battery, the loop current of the low-voltage battery is converted into a current sampling signal in the form of voltage by the sampling resistor, the analog front-end chip converts the current sampling signal to obtain a corresponding current sampling signal output to the master control circuit, the current sampling of the loop of the low-voltage battery is realized, the power-on state of the load end is monitored in real time by the master control circuit according to the loop current of the low-voltage battery, and when the load end is powered off, all the switching circuits can be turned on by the master control circuit in time, so as to ensure the power-on stability of the load end. The reliability of current sampling of the low-voltage battery in an extreme situation is improved, and the power supply stability and reliability of the low-voltage power distribution architecture are also improved.

[0041] In some embodiments, the resistance values of the sampling resistors in the first current sampling circuit and the second current sampling circuit are the same.

[0042] In the technical scheme of the embodiment of the present application, the resistance values of the sampling resistors in the first current sampling circuit and the second current sampling circuit are the same, which can ensure the sampling reliability and parameter consistency of the two current sampling circuits, avoid too large difference in sampling environment from causing too large difference in sampling results, and improve the accuracy of current sampling. The main control circuit can monitor the power-on condition of the load end in real time according to the loop current of the low-voltage battery, and when the load end is powered off, the main control circuit can turn on all the switch circuits in time, thereby ensuring the power-on stability of the load end, improving the reliability of current sampling of the low-voltage battery in an extreme condition, and improving the power supply stability and reliability of the low-voltage power distribution architecture.

[0043] The second aspect of the embodiment of the present application further provides a power distribution system, which comprises the low-voltage power distribution architecture according to any one of the above embodiments.

[0044] The third aspect of the embodiment of the present application further provides a vehicle, which comprises the low-voltage power distribution architecture according to any one of the above embodiments.

[0045] In the technical scheme of the embodiment of the present application, the low-voltage power distribution architecture is arranged in the vehicle to supply power to the low-voltage load in the vehicle, at least two switch circuits are arranged between the low-voltage battery and the load end, a switch driving circuit is connected with the at least two switch circuits, the switch driving circuit is controlled by a main control circuit, and the switch state of the at least two switch circuits is controlled, so that one redundant switch is added, the problem of power failure of the load end when one of the switch circuits fails can be avoided, and the power supply stability and reliability of the low-voltage power distribution architecture are improved.

[0046] 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 specific embodiments 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. BRIEF DESCRIPTION OF DRAWINGS

[0047] 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 accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limitations on the present application. Moreover, in the entire drawings, the same reference numerals are used to designate the same components. In the drawings:

[0048] Figure 1 The first structure schematic diagram of the low-voltage power distribution architecture provided by the embodiment of the present application;

[0049] Figure 2 The second structure schematic diagram of the low-voltage power distribution architecture provided by the embodiment of the present application;

[0050] Figure 3A third structure diagram of the low-voltage power distribution architecture provided by the embodiment of the present application is shown in FIG. 3.

[0051] Figure 4 A fourth structure diagram of the low-voltage power distribution architecture provided by the embodiment of the present application is shown in FIG. 4.

[0052] Figure 5 A fifth structure diagram of the low-voltage power distribution architecture provided by the embodiment of the present application is shown in FIG. 5. DETAILED DESCRIPTION

[0053] 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.

[0054] 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.

[0055] 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 "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0056] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase is not necessarily referring to the same embodiment at different locations in the specification, nor is it necessarily a separate 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.

[0057] 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 " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0058] In the description of the embodiments of the present application, the term "a plurality of frames" refers to two or more (including two).

[0059] In the description of the embodiments of the present application, the directions or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the directions or positional relationships 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.

[0060] In the related art, the positive electrode control of the lithium battery is usually provided with only one control chip, and if the control chip fails, the whole vehicle battery will be powered off, which has a serious negative impact on the driving of the vehicle.

[0061] To solve the above technical problems, the embodiments of the present application provide a low-voltage power distribution architecture, as shown in Figure 1 The low-voltage power distribution architecture in the embodiments includes a low-voltage battery 100, at least two switching circuits 200, a switching drive circuit 300, and a master control circuit 400. The low-voltage battery 100 is connected to a load end 500 through the at least two switching circuits 200;

[0062] The switching drive circuit 300 is connected to the switching circuit 200, and the switching drive circuit 300 is controlled by the master control circuit 400 to control the switching state of the at least two switching circuits 200.

[0063] In the embodiments of the present application, at least two switching circuits 200 are provided between the low-voltage battery 100 and the load end 500, the switching drive circuit 300 is connected to the at least two switching circuits 200, and the switching drive circuit 300 is controlled by the master control circuit 400 to control the switching state of the at least two switching circuits 200, thereby increasing a redundant switching circuit, which can avoid the problem of power failure of the load end 500 when one of the switching circuits 200 fails, and improves the power supply stability and reliability of the low-voltage power distribution architecture.

[0064] In some embodiments, as shown in Figure 2 The at least two switching circuits 200 include a first switching circuit 210 and a second switching circuit 220, the first switching circuit 210 is connected between the positive electrode of the low-voltage battery 100 and the positive electrode of the load end 500, the second switching circuit 220 is connected between the positive electrode of the low-voltage battery 100 and the positive electrode of the load end 500, and the first switching circuit 210 and the second switching circuit 220 are controlled by the switching drive circuit 300.

[0065] In the embodiment of the application, the first switch circuit 210 and the second switch circuit 220 in parallel can be formed by setting the first switch circuit 210 between the positive electrode of the low-voltage battery 100 and the positive electrode of the load end 500 and setting the second switch circuit 220 between the positive electrode of the low-voltage battery 100 and the positive electrode of the load end 500. The types of the first switch circuit 210 and the second switch circuit 220 can be set according to the application scene requirements. By increasing a group of positive electrode switches of different switch types, when one group of switches fails, the other group of switches can be turned on, which will not affect the power-on of the power supply end, avoids the problem that the load end 500 is powered off when one of the switch circuits 200 fails, and improves the power supply stability and reliability of the low-voltage power distribution architecture.

[0066] In some embodiments, the switch driving circuit 300 includes at least two sub-switch driving circuits corresponding to the at least two switch circuits 200; and the at least two sub-switch driving circuits are controlled by the master control circuit 400 to control the switch state of the at least two switch circuits 200.

[0067] In the embodiment of the application, the corresponding switch driving circuit 300 is set for each switch circuit 200, and each switch driving circuit 300 is controlled by the master control circuit 400. By increasing a group of positive electrode switches of different switch types, when one group of switches fails, the other group of switches can be turned on, which will not affect the power-on of the power supply end. When any one of the switch driving circuits 300 fails, the other switch driving circuit 300 can drive the corresponding switch circuit 200 to turn on in time, avoiding the problem that the load end 500 is powered off when one of the positive electrode switches fails, and improving the power supply stability and reliability of the low-voltage power distribution architecture.

[0068] In some embodiments, as shown in Figure 3 The at least two sub-switch driving circuits can include the first switch driving circuit 310 and the second switch driving circuit 320. The master control circuit 400 can control the switch state of the first switch circuit 210 by controlling the first switch driving circuit 310, and the master control circuit 400 can control the switch state of the second switch circuit 220 by controlling the second switch driving circuit 320.

[0069] In some embodiments, the master control circuit 400 is configured to control at least one switch circuit 200 to turn on in the case that the load end 500 is powered on.

[0070] In the embodiment of the present application, the low-voltage battery 100 and the load end 500 are provided with at least two switch circuits 200. In the case that the load end 500 needs to be powered, at least one switch circuit 200 can be controlled to be turned on, so as to realize the power supply control of the load end 500. The positive electrode switches adopted by the two switch circuits 200 can be power switches of different batches or different manufacturers. In this way, the problem that the power switches of the same batch fail at the same time under the same working condition can be avoided, and the stability of the low-voltage power distribution architecture is improved. Moreover, since the low-voltage battery 100 is in the preset voltage range, when the demand power of the load end 500 increases, the current of the low-voltage battery 100 increases. By setting multiple switch circuits 200 to be turned on, the current flowing through each switch circuit 200 will not be too large when a large power is output. This not only plays a role of redundant switch, but also reduces the current flowing through each switch circuit 200, so as to reduce the heat generation of the switch circuit 200. Moreover, the problem that the load end 500 is powered off when one of the positive electrode switches fails is avoided, and the power supply stability and reliability of the low-voltage power distribution architecture are improved.

[0071] In some embodiments, the master control circuit 400 is configured to control the at least two switch circuits 200 to be turned on alternately in the case that the load end 500 is powered.

[0072] In the embodiment of the present application, the low-voltage battery 100 and the load end 500 are provided with at least two switch circuits 200. In the case that the load end 500 needs to be powered, at least two switch circuits 200 can be controlled to be turned on alternately, so as to realize the power supply control of the load end 500. In this way, one of the switch circuits 200 can be turned on, and the other switch circuit 200 can be turned off, so as to increase the service life of the positive electrode switch.

[0073] In some embodiments, the switch circuit 200 includes a bidirectional switch tube. The first end and the second end of the bidirectional switch tube are connected to the positive electrode of the low-voltage battery 100 and the positive electrode of the load end 500 respectively. The control end of the bidirectional switch tube is connected to the switch driving circuit 300.

[0074] In the embodiment of the present application, the first end and the second end of the bidirectional switch tube are connected to the positive electrode of the low-voltage battery 100 and the positive electrode of the load end 500 respectively. The control end of the bidirectional switch tube is connected to the switch driving circuit 300. The on-off direction of the bidirectional switch tube can be controlled by the switch driving circuit 300. In the case that the low-voltage battery 100 needs to be charged, the low-voltage battery 100 can be charged by the external power supply connected to the load end 500. In the case that the low-voltage battery 100 needs to supply power to the load end 500, the low-voltage battery 100 can output current to the load end 500 through the bidirectional switch tube, so as to realize the charging and discharging control of the low-voltage battery 100.

[0075] In some embodiments, the low-voltage power distribution architecture further comprises at least two current sampling circuits; the at least two current sampling circuits are connected in series, and the at least two current sampling circuits sample the current of the low-voltage battery 100 to obtain corresponding current sampling signals and output the current sampling signals to the main control circuit 400.

[0076] In the embodiments of the application, the two current sampling circuits are arranged to sample the current of the low-voltage battery 100 to obtain corresponding current sampling signals and output the current sampling signals to the main control circuit 400, so that the reliability of current sampling of the low-voltage battery 100 in an extreme case can be improved, and the power supply stability and reliability of the low-voltage power distribution architecture are ensured.

[0077] In some embodiments, referring to Figure 4 The at least two current sampling circuits comprise a first current sampling circuit 610 and a second current sampling circuit 620; the first current sampling circuit 610 samples the current of the low-voltage battery 100 to obtain a first current sampling signal, and the second current sampling circuit 620 samples the current of the low-voltage battery 100 to obtain a second current sampling signal; and the main control circuit 400 controls the switching state of the at least two switching circuits 200 according to the first current sampling signal and the second current sampling signal.

[0078] In the embodiments of the application, the first current sampling circuit 610 samples the current of the low-voltage battery 100 to obtain a first current sampling signal and output the first current sampling signal to the main control circuit 400, and the second current sampling circuit 620 samples the current of the low-voltage battery 100 to obtain a second current sampling signal and output the second current sampling signal to the main control circuit 400. The main control circuit 400 controls the switching state of the at least two switching circuits 200 according to the first current sampling signal and the second current sampling signal, so that the power-on condition of the load end 500 can be monitored in real time according to the loop current of the low-voltage battery 100, the power-off condition of the load end 500 can be detected in time, all the switching circuits 200 can be turned on by the main control circuit 400, the power-on stability of the load end 500 is ensured, the reliability of current sampling of the low-voltage battery 100 in an extreme case is improved, and the power supply stability and reliability of the low-voltage power distribution architecture are improved.

[0079] In some embodiments, the sampling periods of the first current sampling circuit 610 and the second current sampling circuit 620 are different.

[0080] In the embodiments of the present application, the first current sampling circuit 610 samples the current of the low-voltage battery 100 to obtain a first current sampling signal output to the main control circuit 400, and the second current sampling circuit 620 samples the current of the low-voltage battery 100 to obtain a second current sampling signal output to the main control circuit 400. The first current sampling circuit 610 can sample the loop current of the low-voltage battery 100 according to a smaller sampling period, and the second current sampling circuit 620 can sample the loop current of the low-voltage battery 100 according to a larger sampling period. In this way, the loop current of the low-voltage battery 100 can be sampled according to the corresponding sampling period according to the application scenario, so as to achieve the purpose of reducing the sampling power consumption. The first current sampling circuit 610 and the second current sampling circuit 620 can also sample the loop current of the low-voltage battery 100 at the same time, and the main control circuit 400 controls the switching state of the at least two switching circuits 200 according to the first current sampling signal and the second current sampling signal, so as to realize the current monitoring of large period and small period, improve the accuracy of current sampling, and can monitor the power-on state of the load end 500 according to the loop current of the low-voltage battery 100. In the case of power failure of the load end 500, the main control circuit 400 can turn on all the switching circuits 200 in time, so as to ensure the power-on stability of the load end 500, not only improve the reliability of current sampling of the low-voltage battery 100 in extreme conditions, but also improve the power supply stability and reliability of the low-voltage power distribution architecture.

[0081] In some embodiments, the sampling period of the first current sampling circuit 610 can be 1 second, and the sampling period of the second current sampling circuit 620 can be 1 minute.

[0082] In some embodiments, the main control circuit 400 verifies the second current sampling signal according to the first current sampling signal.

[0083] In some embodiments, the main control circuit 400 verifies the first current sampling signal according to the second current sampling signal.

[0084] In the embodiments of the present application, the main control circuit 400 can verify the first current sampling circuit 610 and the second current sampling circuit 620 according to the first current sampling signal and the second current sampling signal, so as to ensure the reliability of the collected current data. The main control circuit 400 controls the switching state of the at least two switching circuits 200 according to the first current sampling signal and the second current sampling signal, so as to avoid sampling error of one of the current sampling circuits and improve the accuracy of current sampling. In addition, the main control circuit 400 can monitor the power-on state of the load end 500 according to the loop current of the low-voltage battery 100 in real time. When the load end 500 is powered off, the main control circuit 400 can turn on all the switching circuits 200 in time, so as to ensure the power-on stability of the load end 500. The reliability of current sampling of the low-voltage battery 100 in extreme conditions is improved, and the power supply stability and reliability of the low-voltage power distribution architecture are also improved.

[0085] In some embodiments, the first current sampling circuit 610 samples the loop current of the low-voltage battery 100 to obtain the first current sampling signal, and the second current sampling circuit 620 samples the loop current of the low-voltage battery 100 to obtain the second current sampling signal. If the difference between the voltage values of the first current sampling signal and the second current sampling signal is large, the voltage value of the larger one is taken as the reference value. The main control circuit 400 selects the first current sampling signal and the second current sampling signal with larger voltage value as the reference value of the loop current of the low-voltage battery 100 to control the switching circuit 200.

[0086] In some embodiments, the first current sampling circuit 610 and the second current sampling circuit 620 are controlled by the main control circuit 400 to alternately sample the current of the low-voltage battery 100.

[0087] In the embodiment of the present application, the first current sampling circuit 610 and the second current sampling circuit 620 are controlled by the master control circuit 400 to alternately sample the current of the low-voltage battery 100, so that full-cycle sampling of the low-voltage battery 100 can be realized. When one of the current sampling circuits rests, the other one performs current sampling. The master control circuit 400 can check the first current sampling circuit 610 and the second current sampling circuit 620 according to the first current sampling signal and the second current sampling signal, so as to avoid a large difference between the sampling values of the current in the adjacent two sampling periods, and ensure the reliability of the collected current data. The master control circuit 400 controls the switching state of the at least two switching circuits 200 according to the first current sampling signal and the second current sampling signal, so as to avoid sampling error of one of the current sampling circuits, improve the accuracy of current sampling, and can monitor the power-on condition of the load end 500 according to the loop current of the low-voltage battery 100 in real time. When the load end 500 appears power-down, the master control circuit 400 can turn on all the switching circuits 200 in time, so as to ensure the power-on stability of the load end 500. The reliability of current sampling of the low-voltage battery 100 in extreme conditions is improved, and the power supply stability and reliability of the low-voltage power distribution architecture are improved.

[0088] In some embodiments, the first current sampling circuit 610 is connected between the positive electrode of the low-voltage battery 100 and the positive electrode of the load end 500, and the second current sampling circuit 620 is connected between the negative electrode of the low-voltage battery 100 and the negative electrode of the load end 500.

[0089] In the embodiment of the present application, the first current sampling circuit 610 samples the current between the positive electrode of the low-voltage battery 100 and the positive electrode of the load end 500 to obtain the first current sampling signal, and the second current sampling circuit 620 samples the current between the negative electrode of the low-voltage battery 100 and the negative electrode of the load end 500 to obtain the second current sampling signal. In this way, the current at different positions of the loop of the low-voltage battery 100 can be sampled, which is beneficial to the reliability of the current sampling data. The master control circuit 400 controls the switching state of the at least two switching circuits 200 according to the first current sampling signal and the second current sampling signal, so as to avoid sampling error of one of the current sampling circuits, improve the accuracy of current sampling, and can monitor the power-on condition of the load end 500 according to the loop current of the low-voltage battery 100 in real time. When the load end 500 appears power-down, the master control circuit 400 can turn on all the switching circuits 200 in time, so as to ensure the power-on stability of the load end 500. The reliability of current sampling of the low-voltage battery 100 in extreme conditions is improved, and the power supply stability and reliability of the low-voltage power distribution architecture are improved.

[0090] In some embodiments, the current sampling circuit includes an analog front-end chip and a sampling resistor, the sampling resistor is connected in series with the low-voltage battery 100, and the analog front-end chip generates a corresponding current sampling signal according to a voltage signal at both ends of the sampling resistor and outputs the current sampling signal to the main control circuit 400.

[0091] In the embodiments of the present application, the loop current of the low-voltage battery 100 is converted into a current sampling signal in the form of voltage by the sampling resistor connected in series with the low-voltage battery 100, the analog front-end chip performs signal conversion on the current sampling signal to obtain a corresponding current sampling signal output to the main control circuit 400, the loop current of the low-voltage battery 100 is sampled, the power-on condition of the load end 500 is monitored in real time by the main control circuit 400 according to the loop current of the low-voltage battery 100, and when the load end 500 appears a power-down condition, all the switching circuits 200 can be turned on in time by the main control circuit 400, thereby ensuring the power-on stability of the load end 500, improving the reliability of the current sampling of the low-voltage battery 100 in an extreme condition, and improving the power supply stability and reliability of the low-voltage power distribution architecture.

[0092] In some embodiments, the resistance values of the sampling resistors in the first current sampling circuit 610 and the second current sampling circuit 620 are the same.

[0093] In the embodiments of the present application, by setting the resistance values of the sampling resistors in the first current sampling circuit 610 and the second current sampling circuit 620 to be the same, the sampling reliability and parameter consistency of the two current sampling circuits can be ensured, the difference between the sampling results caused by too large sampling environment difference is avoided, and the accuracy of the current sampling is improved. The power-on condition of the load end 500 is monitored in real time by the main control circuit 400 according to the loop current of the low-voltage battery 100, and when the load end 500 appears a power-down condition, all the switching circuits 200 can be turned on in time by the main control circuit 400, thereby ensuring the power-on stability of the load end 500, improving the reliability of the current sampling of the low-voltage battery 100 in an extreme condition, and improving the power supply stability and reliability of the low-voltage power distribution architecture.

[0094] In some embodiments, referring to FIG. 2, Figure 5 As shown in FIG. 2, the first switching circuit 210 includes a first P-type MOS tube Q11 and a first N-type MOS tube Q12, the source of the first P-type MOS tube Q11 is connected with the drain of the first N-type MOS tube Q12, the drain of the first P-type MOS tube Q11 is connected with the positive electrode of the low-voltage battery 100, the source of the first N-type MOS tube Q12 is connected with the positive electrode of the load end 500, and the gates of the first P-type MOS tube Q11 and the first N-type MOS tube Q12 are connected to the first switching drive circuit 310.

[0095] In some embodiments, referring to FIG. 2, Figure 5As shown, the second switch circuit 220 includes a second P-type MOS tube Q21 and a second N-type MOS tube Q22, the source of the second P-type MOS tube Q21 is connected with the drain of the second N-type MOS tube Q22, the drain of the second P-type MOS tube Q21 is connected with the positive pole of the low-voltage battery 100, the source of the second N-type MOS tube Q22 is connected with the positive pole of the load end 500, and the gates of the second P-type MOS tube Q21 and the second N-type MOS tube Q22 are connected with the second switch driving circuit 320.

[0096] In some embodiments, referring to Figure 5 As shown, the first current sampling circuit 610 includes a first analog front-end chip 612 and a first sampling resistor 611, the second current sampling circuit 620 includes a second analog front-end chip 622 and a second sampling resistor 621, the first sampling resistor 611 and the second sampling resistor 621 are connected in series, two sampling pins of the first analog front-end chip 612 are connected with two ends of the first sampling resistor 611 respectively, the output pin of the first analog front-end chip 612 is connected with the master control circuit 400, two sampling pins of the second analog front-end chip 622 are connected with two ends of the second sampling resistor 621 respectively, and the output pin of the second analog front-end chip 622 is connected with the master control circuit 400.

[0097] The embodiment of the present application further provides a power distribution system, including the low-voltage power distribution architecture according to any one of the above embodiments.

[0098] The embodiment of the present application further provides a vehicle, including the low-voltage power distribution architecture according to any one of the above embodiments.

[0099] In the embodiment of the present application, the low-voltage power distribution architecture is arranged in the vehicle to supply power to the low-voltage load in the vehicle, at least two switch circuits 200 are arranged between the low-voltage battery 100 and the load end 500, the switch driving circuit 300 is connected with the at least two switch circuits 200, the switch driving circuit 300 is controlled by the master control circuit 400, and the switch state of the at least two switch circuits 200 is controlled, so that one redundant switch is added, the problem that the load end 500 is powered off when one of the switch circuits 200 fails can be avoided, and the power supply stability and reliability of the low-voltage power distribution architecture are improved.

[0100] 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 taken as an example for description, and in actual application, 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 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 system can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0101] 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.

[0102] 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 the 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 shown or discussed elements can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0103] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they 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 purpose of the embodiment.

[0104] 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 software functional unit.

[0105] The above examples are only used to illustrate the technical solutions of the present application, but not limit the same; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent ones; 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 architecture, characterized by, The low-voltage power distribution architecture comprises a low-voltage battery, at least two switching circuits, a switching drive circuit, and a master control circuit. The low-voltage battery is connected to a load end through the at least two switching circuits. The switching drive circuit is connected to the switching circuits and is controlled by the master control circuit to control the switching state of the at least two switching circuits.

2. The low voltage power distribution architecture of claim 1, wherein, The at least two switching circuits comprise: A first switching circuit connected between the positive pole of the low-voltage battery and the positive pole of the load end; A second switching circuit connected between the positive pole of the low-voltage battery and the positive pole of the load end; The first switching circuit and the second switching circuit are controlled by the switching drive circuit.

3. The low voltage power distribution architecture of claim 1, wherein, The switching drive circuit comprises at least two sub-switching drive circuits, which are connected to the at least two switching circuits one by one. The at least two sub-switching drive circuits are controlled by the master control circuit to control the switching state of the at least two switching circuits, respectively.

4. The low voltage power distribution architecture of any of claims 1-3, wherein, The master control circuit is configured to control at least one of the switching circuits to be turned on when the load end is powered on.

5. The low voltage power distribution architecture of claim 4, wherein, The master control circuit is configured to control the at least two switching circuits to be turned on alternately when the load end is powered on.

6. The low voltage power distribution architecture of any of claims 1-3, wherein, The switching circuit comprises a bidirectional switch tube, the first end and the second end of the bidirectional switch tube are connected to the positive pole of the low-voltage battery and the positive pole of the load end, respectively, and the control end of the bidirectional switch tube is connected to the switching drive circuit.

7. The low voltage power distribution architecture of claim 1, wherein, The low-voltage power distribution architecture further comprises at least two current sampling circuits. The at least two current sampling circuits are connected in series, and the at least two current sampling circuits sample the current of the low-voltage battery to obtain corresponding current sampling signals and output the current sampling signals to the master control circuit.

8. The low voltage power distribution architecture of claim 7, wherein, The at least two current sampling circuits comprise a first current sampling circuit and a second current sampling circuit. The first current sampling circuit samples the current of the low-voltage battery to obtain a first current sampling signal, and the second current sampling circuit samples the current of the low-voltage battery to obtain a second current sampling signal. The master control circuit controls the switching state of the at least two switching circuits according to the first current sampling signal and the second current sampling signal.

9. The low voltage power distribution architecture of claim 8, wherein, The sampling periods of the first current sampling circuit and the second current sampling circuit are different.

10. The low voltage power distribution architecture of claim 8, wherein, The master control circuit verifies the second current sampling signal according to the first current sampling signal, and / or The master control circuit verifies the first current sampling signal according to the second current sampling signal.

11. The low voltage power distribution architecture of claim 8, wherein, The first current sampling circuit and the second current sampling circuit are controlled by the master control circuit to sample the current of the low-voltage battery alternately.

12. The low voltage power distribution architecture of any of claims 8-11, wherein, The first current sampling circuit is connected between the positive pole of the low-voltage battery and the positive pole of the load end, and the second current sampling circuit is connected between the negative pole of the low-voltage battery and the negative pole of the load end.

13. The low voltage power distribution architecture of any of claims 7-11, wherein, The current sampling circuit comprises an analog front-end chip and a sampling resistor, the sampling resistor is connected in series with the low-voltage battery, and the analog front-end chip generates a corresponding current sampling signal according to the voltage signal across the sampling resistor and outputs the current sampling signal to the master control circuit.

14. The low voltage power distribution architecture of any of claims 8-11, wherein, The sampling resistance in the first current sampling circuit and the sampling resistance in the second current sampling circuit have the same resistance value.

15. A power distribution system, characterized by, Comprising: The low voltage power distribution architecture of any of claims 1-14.

16. A vehicle characterized by comprising: Comprising: The low voltage power distribution architecture of any of claims 1-14.

Images