Power supply system and electrical box

Abstract

The utility model relates to a power supply system and an electrical box, and relates to the technical field of intelligent electrical boxes. The power supply system comprises a rechargeable battery, a redundant circuit, a first electronic switch and a second electronic switch, wherein the redundant circuit comprises two paths of power input ends, two paths of power output ends and two paths of control circuits; the two power supply input ends are electrically connected with the output end of the rechargeable battery and the output end of an external power supply respectively; the two power supply output ends are electrically connected with one end of the first electronic switch and one end of the second electronic switch respectively; the two control circuits are used for selecting at least one of an external power supply and a rechargeable battery to supply power to the two power supply output ends; and the other ends of the first electronic switch and the second electronic switch are electrically connected with an external load respectively. According to the power supply system, the power utilization stability of the load is improved, the standby power consumption is reduced, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent electrical boxes, and particularly to a power supply system and an electrical box. Background Art

[0002] In a power supply system (Power Distribution Unit, abbreviated as PDU, also known as an intelligent electrical box), an electronic switch (such as an electronic fuse, efuse) is mainly used to replace the hardware switches (fuses) and relays used in a conventional electrical box, so as to meet the vehicle's requirements for fault diagnosis, status monitoring and reporting, and self-recovery functions of various electrical equipment. At the same time, by combining intelligent software, the working strategy can be adjusted automatically according to the actual usage conditions and status monitoring.

[0003] However, since the PDU is connected to a large number of external electrical loads (such as low-voltage electrical components, low-voltage loads, controllers, etc.), the number of channels corresponding to the electronic switches and the number of objects that the MCU needs to monitor are large, resulting in a large difference in the power supply requirements between the working mode and the standby mode of the PDU. How to improve the electrical stability of the external loads connected to the PDU, how to reduce the power consumption of the PDU, improve the energy utilization efficiency, and ensure the long-term standby function of the PDU are problems that need to be solved urgently at present.

[0004] In view of the above problems in the related art, no effective solution has been proposed yet. Summary of the Utility Model

[0005] The power supply system and electrical box provided by the embodiments of the present utility model at least solve the problems of poor electrical stability of loads in the power supply system, high standby power consumption, difficulty in meeting long-term standby, and low energy utilization efficiency in the related art.

[0006] To solve the above problems, in one aspect of the embodiments of the present utility model, a power supply system is provided, including: a rechargeable battery 10, a redundant circuit 20, a first electronic switch 31, and a second electronic switch 31; wherein,

[0007] The redundant circuit 20 includes two power input terminals, two power output terminals, and two control circuits; wherein, the two power input terminals are respectively electrically connected to the output terminal of the rechargeable battery 10 and the output terminal of the external power supply 101; the two power output terminals are respectively electrically connected to one end of the first electronic switch 31 and the second electronic switch 32; the two control circuits are used to select at least one of the external power supply 101 and the rechargeable battery 10 to supply power to the two power output terminals;

[0008] The other ends of the first electronic switch 31 and the second electronic switch 32 are respectively electrically connected to the external load 102.

[0009] In some of these embodiments, in the two control circuits:

[0010] The first control circuit includes a first switch 21 and a first control module 22, and the second control circuit includes a second switch 23 and a second control module 24; wherein, one end of the first control module 22 is electrically connected to the first switch 21, one end of the second control module 24 is electrically connected to the second switch 23, and the other ends of the first control module 22 and the second control module 24 are both electrically connected to the rechargeable battery 10;

[0011] When the power supply system is in the working mode, the rechargeable battery 10 is respectively kept electrically connected to the first control module 22 and the second control module 24;

[0012] When the power supply system is in the standby mode, the rechargeable battery 10 is kept electrically connected to the first control module 22 and is disconnected from the second control module 24.

[0013] In some of the embodiments, in the two-way control circuits:

[0014] The first control module 22 is respectively electrically connected to the input end, the output end of the first switch 21, and the gate of the MOS transistor in the first switch 21, and the second control module 24 is respectively electrically connected to the input end, the output end of the second switch 23, and the gate of the MOS transistor in the second switch 23; wherein,

[0015] Both the first switch 21 and the second switch 23 include at least one group of MOS switching transistors; wherein, each group of MOS switching transistors includes a first MOS transistor and a second MOS transistor, and the source electrode of the first MOS transistor is connected in series with the source electrode of the second MOS transistor.

[0016] In some of the embodiments, in the two-way power output terminals:

[0017] The first power output terminal is respectively electrically connected to at least two first electronic switches 31, and / or,

[0018] The second power output terminal is respectively electrically connected to at least two second electronic switches 32.

[0019] In some of the embodiments, the power supply system further includes an MCU 40, and the MCU 40 is electrically connected to the rechargeable battery 10; wherein, when the power supply system is in the standby mode, the rechargeable battery 10 is disconnected from the MCU 40.

[0020] In some of the embodiments, the power supply system further includes a voltage detection component 50, wherein the voltage detection component includes a first resistor 51 and a second resistor 52;

[0021] One end of the first resistor 51 is grounded, and the other end of the first resistor 51 is electrically connected to the MCU 40 and one end of the second resistor 52 respectively. The other end of the second resistor 52 is electrically connected to two power output terminals respectively. Among them, the resistance value of the first resistor 51 is less than that of the second resistor 52.

[0022] In some of the embodiments, the voltage detection component further includes a third resistor 53, a fourth resistor 54 and an analog electronic switch 55. Among them:

[0023] One end of the third resistor 53 is grounded, and the other end of the third resistor 53 is electrically connected to the MCU 40 and one end of the fourth resistor 54 respectively. The other end of the fourth resistor 54 is electrically connected to the sides of the first electronic switch 31 and the second electronic switch 32 close to the external load respectively. Among them, the resistance value of the third resistor 53 is the same as that of the first resistor 51, and the resistance value of the fourth resistor 54 is the same as that of the second resistor 52.

[0024] One end of the analog electronic switch 55 is electrically connected to the first resistor 51 and the second resistor 52 respectively, and the other end of the analog electronic switch 55 is electrically connected to the third resistor 53 and the fourth resistor 54 respectively. Among them, when the power supply system is in the working mode, the analog electronic switch 55 remains closed, and when the power supply system is in the standby mode, the analog electronic switch 55 remains open.

[0025] In some of the embodiments, the power supply system further includes a voltage regulation circuit for regulating the voltage value input by the rechargeable battery 10. Among them, the voltage regulation circuit includes a first regulation circuit 61 and a second regulation circuit 62.

[0026] The input end of the first regulation circuit 61 is electrically connected to the rechargeable battery 10, and the output end of the first regulation circuit 61 is electrically connected to the first control circuit and the signal monitoring circuit 90 respectively.

[0027] The input end of the second regulation circuit 62 is electrically connected to the rechargeable battery 10, and the output end of the second regulation circuit 62 is electrically connected to the second control circuit and the MCU 40 respectively. Among them, when the power supply system is in the standby mode, the rechargeable battery 10 is disconnected from the second regulation circuit 62.

[0028] In some of the embodiments, the power supply system further includes a communication module 70 and an analog front-end chip 80. Among them,

[0029] The communication module 70 is electrically connected to the MCU 40 and the central controller 103 respectively. The analog front-end chip 80 is electrically connected to the MCU 40 and the rechargeable battery 10 respectively, and is used to obtain the battery parameters of the rechargeable battery.

[0030] In some of these embodiments, when the power supply system is in the working mode, the second electronic switch 32 remains open.

[0031] Another aspect of the embodiments of the present utility model provides an electrical box, which includes a box cover 501, a box body 502, and a printed circuit board 503; wherein, the redundant circuit 20, the first electronic switch 31, and the second electronic switch 32 of any one of the above power supply systems are printed on the printed circuit board 503, the box cover 501 and the box body 502 form a closed space, and the printed circuit board 503 and the rechargeable battery 10 are arranged inside the box body 502.

[0032] Advantages of the embodiments of the present utility model: By integrating the redundant circuit and the rechargeable battery into the power supply system, since the redundant circuit can select at least one power supply path from the external power supply and the rechargeable battery, the power consumption stability of the external load electrically connected to the power supply system is improved. At the same time, the two control circuits in the redundant circuit can be independently controlled in the working mode and standby mode of the power supply system, and the control operation of one control circuit can be stopped in the standby mode, thereby effectively reducing the power consumption of the power supply system in the standby mode, further ensuring the long-term standby operation of the power supply system, and improving the technical effect of energy utilization efficiency.

[0033] Details of one or more embodiments of the present utility model are set forth in the following drawings and description, so that other features, objects, and advantages of the present utility model will become more clearly understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other embodiments based on these drawings without creative efforts.

[0035] Figure 1 is a circuit block diagram of a power supply system according to an embodiment of the embodiments of the present utility model.

[0036] Figure 2 is a circuit block diagram of a redundant circuit according to an embodiment of the embodiments of the present utility model.

[0037] Figure 3 is a circuit block diagram of a voltage acquisition circuit according to an embodiment of the embodiments of the present utility model.

[0038] Figure 4 is a circuit block diagram between a rechargeable battery and electrical components inside a power supply system according to an embodiment of the embodiments of the present utility model.

[0039] Figure 5 It is a structural schematic diagram of an electrical box according to an embodiment of the present utility model.

[0040] Reference numerals:

[0041] 10--Rechargeable battery; 20--Redundant circuit; 21—First switch; 22—First control module; 23—Second switch; 24—Second control module; 31---First electronic switch; 32---Second electronic switch; 40--MCU; 50--Voltage detection component; 51--First resistor; 52--Second resistor; 53--Third resistor; 54--Fourth resistor; Analog electronic switch--55; 61--First adjustment circuit; 62--Second adjustment circuit; 70--Communication module; 80--Analog front-end chip; 90--Signal monitoring circuit; 101--External power supply; 102--External load; 103--Central controller; 501--Box cover; 502--Box body; 503--Printed circuit board. Specific embodiments

[0042] Embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. Although some embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Instead, these embodiments are provided to more thoroughly and completely understand the present utility model. It should be understood that the drawings and embodiments of the present utility model are for illustrative purposes only and are not intended to limit the protection scope of the present utility model.

[0043] Rechargeable battery: It is a high-performance, rechargeable battery specifically designed for automobiles equipped with an engine start-stop system. The form of the rechargeable battery can be an on-vehicle battery or a start-stop battery. The types of rechargeable batteries can include batteries that can achieve cyclic charge and discharge, such as lead-acid batteries, lithium-ion batteries, and sodium-ion batteries. The main purpose of such batteries is to meet the frequent charge and discharge requirements brought by the start-stop system, ensuring that the engine can automatically shut down when the vehicle is temporarily stopped (such as waiting for a traffic light or in traffic congestion) to save fuel and reduce emissions, and when the driver is ready to continue driving, it can quickly and reliably restart the engine.

[0044] Electronic switch: Usually refers to high-current semiconductor switches, such as MOSFET (Metal Oxide Semiconductor Field Effect Transistor), IGBT (Insulated Gate Bipolar Transistor), or intelligent power switches integrated with protection functions. Compared with traditional fuses, electronic switches are smaller in size, lighter in weight, easier to integrate on circuit boards, and have higher response speed and reliability; among them, electronic fuse (efuse) is a type of electronic switch, which is a programmable electronic component integrated inside a semiconductor chip. It uses the principles of electronics and thermal effects to achieve protection functions similar to traditional fuses, but has programmability and non-volatile storage capabilities.

[0045] MCU (Microcontroller Unit) is the core component in the intelligent electrical box PDU, undertaking various key functions to ensure that the electrical box can execute various tasks efficiently and intelligently. Specifically, it can be used to monitor the battery information of the start-stop battery, monitor the output voltage corresponding to the electronic switch, and also receive instructions from the vehicle control unit, control the torque and speed of the motor, perform efficient power conversion, and provide fault diagnosis and protection functions for the motor system.

[0046] In the traditional automotive electronic and electrical architecture, the electrical box refers to the fuse box integrated in the whole vehicle, which is located in the next electrical link of the low-voltage start-stop lead-acid battery. It integrates fuses and relays inside, undertaking the functions of controlling the current channels of low-voltage electrical components and cutting off protection in case of current abnormalities. However, the conventional electrical box has a high cost, solidified molds, complex changes and repairs, is not conducive to high-current distribution, has a large dependence on external cables, cannot flexibly adapt to the protection conditions of the load, and has a blind spot in monitoring the state of the key component of the start-stop battery. Therefore, the intelligent electrical box (PDU) is increasingly favored by automotive manufacturers.

[0047] In the PDU, traditional fuses and relays are no longer used, but electronic switches (such as electronic fuse efuse) are adopted. The PDU also needs to meet the requirements of the whole vehicle for fault diagnosis, status monitoring and reporting, and self-recovery functions of various electrical equipment. This requires ensuring the power supply stability of various electrical equipment and monitoring the connected electrical equipment. Due to the battery capacity limitation of the start-stop battery, the power consumption of the PDU is relatively large in the standby mode, and it is difficult to achieve the long-term standby function of the PDU. How to reduce the power consumption of the PDU through low-power design to reduce the power consumption of the start-stop battery and solve the problem that the PDU cannot standby for a long time is an urgent problem to be solved currently.

[0048] To solve the above problems, the embodiments of the present utility model provide a power configuration unit, such as Figure 1As shown in the figure, the power supply configuration unit includes: a rechargeable battery 10, a redundant circuit 20, a first electronic switch 31, and a second electronic switch 32. Among them, the redundant circuit 20 includes two power input terminals, two power output terminals, and two control circuits. Among them, the two power input terminals are respectively electrically connected to the output terminal of the rechargeable battery 10 and the output terminal of the external power supply 101. The two power output terminals are respectively electrically connected to one end of the first electronic switch 31 and the second electronic switch 32. The two control circuits are used to select at least one of the external power supply 101 and the rechargeable battery 10 to supply power to the two power output terminals. The other ends of the first electronic switch 31 and the second electronic switch 32 are respectively electrically connected to the external load 102.

[0049] It should be noted that the electrical connection includes any one of electrical connection, signal connection, or wire connection.

[0050] Among them, the rechargeable battery, the redundant circuit, and the electronic switch provided in the embodiments of the present invention are all integrated in the power supply system (PDU, also known as the intelligent electrical box). Accordingly, the wire harness on the PCB (Printed Circuit Board) of the power supply system is lightened and the wire harness docking length is reduced, the electrical distribution path is simplified, zero maintenance during the life cycle of the intelligent electrical box is achieved, functional integration and miniaturized size design are realized, the product service life is extended. At the same time, the lightweight and maintenance-free design positively promotes the vehicle assembly and cost reduction, and also improves the central control ability and integration degree of the vehicle system. The matching work of the rechargeable battery and the electronic switch is realized through integrated control.

[0051] The above redundant circuit can not only select at least one of the external power supply 101 and the rechargeable battery 10 to supply power to the two power output terminals, but also be used to balance the voltage values input by the external power supply 101 and the rechargeable battery 10, ensure that the two input voltages are balanced, thereby ensuring the power supply stability of the external load 102. Among them, the external power supply provided by the present invention can be an in-vehicle DCDC converter, or other forms of external power supplies used in the vehicle system. Correspondingly, the rechargeable battery provided in the embodiments of the present invention can be understood as an internal power supply since it is integrated inside the power supply system.

[0052] In some of the embodiments, the number of the above first electronic switches and second electronic switches is multiple, and the second electronic switch is also electrically connected to the microcontroller MCU. When the power supply system is in the working mode, the MCU sends an instruction to the second electronic switch to keep the second electronic switch 32 disconnected.

[0053] Specifically, the classification of the first electronic switch and the second electronic switch is based on the power consumption requirements of the connected external load. It can be understood that when the PDU is in the working mode, all external loads need to maintain power supply to keep running, and at this time, the electronic switches connected to the external loads also need to maintain power supply to achieve the protection function of external electrical components. However, when the PDU is in the standby mode, some external loads do not require power supply to operate. At this time, if the second electronic switch connected to this part of the external load remains closed, there will be a static current between the second electronic switch and the external load, which will cause current loss of the rechargeable battery. Therefore, when the PDU is in the standby mode, the second electronic switch switches to the off state, which helps to reduce the power consumption of the PDU.

[0054] In some of these embodiments, in the above two-way control circuit: the first control circuit includes a first switch 21 and a first control module 22, and the second control circuit includes a second switch 23 and a second control module 24; wherein, one end of the first control module 22 is electrically connected to the first switch 21, one end of the second control module 24 is electrically connected to the second switch 23, and the other ends of the first control module 22 and the second control module 24 are both electrically connected to the rechargeable battery 10; when the power supply system is in the working mode, the rechargeable battery 10 is respectively electrically connected to the first control module 22 and the second control module 24; when the power supply system is in the standby mode, the rechargeable battery 10 is electrically connected to the first control module 22 and is disconnected from the second control module 24.

[0055] The first switch 21 and the second switch 23 provided in the embodiments of the present invention each include at least one group of MOS switch tubes; wherein, each group of MOS switch tubes includes a first MOS tube and a second MOS tube, and the source electrode of the first MOS tube is connected in series with the source electrode of the second MOS tube. Figure 2 The circuit block diagram of the redundancy circuit 20 in an embodiment is shown, as Figure 2 shown, both the first switch 21 and the second switch 23 include two groups of MOS switch tubes. The first control module 22 is electrically connected to the input end of the first switch 21 via the SA signal line, electrically connected to the output end of the first switch 21 via the SB signal line, and electrically connected to the gates of 4 MOS tubes in the first switch 21 via the GA and GB signal lines. The second control module 24 is electrically connected to the input end of the second switch 23 via the SA signal line, electrically connected to the output end of the second switch 23 via the SB signal line, and electrically connected to the gates of 4 MOS tubes in the second switch 23 via the GA and GB signal lines..

[0056] One end of the first control module 22 is electrically connected to the first switch 21, and one end of the second control module 24 is electrically connected to the second switch 23, which are used to control the conduction and cut-off of the MOS switches in the first switch / second switch, so as to select at least one of the external power supply 101 and the rechargeable battery 10 to supply power to the two power output terminals, and balance the voltage values input by the external power supply 101 and the rechargeable battery 10.

[0057] Specifically, according to the embodiments of the present invention and Figure 2 , by connecting the sources of two MOS transistors in series, the current handling capacity of this group of MOS switches can be increased and more precise current control can be achieved. According to a specific implementation manner of the embodiments of the present invention, the first control module 22 samples the voltage across the first switch 21 and feeds the voltage sampling result back to the MCU. The MCU determines a control signal based on information such as the voltage sampling result, the output power of the external power supply, the load power of the external load, and the output power of the rechargeable battery. The control signal indicates whether the MOS transistor in the first switch should be in the conduction or cut-off state. Based on the conduction instruction indicated by the control signal, the first control module will provide a positive voltage signal to the gate of the MOS transistor in the first switch 21 (for an N-channel MOSFET, the gate voltage is higher than the source; for a P-channel MOSFET, the gate voltage is lower than the source), and this positive voltage must exceed the threshold voltage of the MOS transistor to ensure full conduction of the MOS transistor. After the MOS transistor receives sufficient gate voltage, a conductive channel will be formed under the gate oxide layer of the first MOS transistor and the second MOS transistor, allowing current to flow from the drain of the first MOS transistor to the source. Since the sources of the two MOS transistors are connected in series, the current continues to flow through the source and then to the drain of the second MOS transistor. Accordingly, a drive signal is provided by the first control module, and two MOS transistors in a group of MOS switches in the first switch conduct together as a whole, thus allowing current to pass through the entire circuit. When both MOS transistors are conducting, the current enters from the input end of the first switch 21, passes through the two series-connected MOS transistors, and finally reaches the output end, achieving the conduction state of the circuit.

[0058] The other ends of the first control module 22 and the second control module 24 are electrically connected to the rechargeable battery 10 ( Figure 2Only the schematic lines for supplying power to the first control module 22 and the second control module 24 are shown). When the PDU is in the working mode, the power supply required by the external load 102 is large. At this time, the rechargeable battery 10 can keep supplying power to the first control module 22 and the second control module 24 to achieve rapid balancing of the two input voltages. When the PDU is in the standby mode, the power supply required by the external load 102 is small. At this time, the rechargeable battery 10 can only supply power to the first control module to keep it working. Through the above settings, when the PDU is in the standby mode, by stopping the power supply to one control module, the operating loss of this control module is reduced, and the on-off loss of multiple MOS switching tubes connected to this control module is also reduced, effectively reducing the standby power consumption of the PDU.

[0059] According to a specific embodiment of the present invention, the above control module can select low-power devices. For example, APD 2ED2410-EM (with high performance, flexibility, integrated protection, and low-power characteristics) can be selected as the drive controller of the MOS tube. It can be understood that the above model is not a limitation to the present invention, and other drive controllers with low-power characteristics also belong to the scope protected by the present invention.

[0060] In some of these embodiments, among the above two power output terminals: the first power output terminal is respectively electrically connected to at least two first electronic switches 31, and / or, the second power output terminal is respectively electrically connected to at least two second electronic switches 32.

[0061] In some of these embodiments, the above power supply system further includes an MCU 40, and the MCU 40 is electrically connected to the rechargeable battery 10; wherein, when the power supply system is in the standby mode, the rechargeable battery 10 is disconnected from the MCU 40.

[0062] By integrating an MCU as the control core in the power supply system, it is possible to achieve adaptive protection for the power supply to the external load. The integrated electronic switch has better adaptability than a hardware fuse and can be flexibly adjusted according to the load current, with a wider application range. At the same time, the MCU can also monitor and diagnose the battery information of the rechargeable battery integrated in the PDU (such as the charge and discharge status of the rechargeable battery, overcurrent information of the current, overvoltage information of the voltage, over-temperature at key positions, etc.), and report the diagnosis results to the central controller of the whole vehicle through the bus system for comprehensive judgment and processing, realizing a full closed-loop feedback of information and results, so as to meet the requirements of the intelligent vehicle platform for vehicle-grade functional safety level certification and electrical intelligence.

[0063] Through the above settings, when the PDU is in the standby mode, stopping the power supply to the MCU helps to reduce the power consumption during standby.

[0064] In some of these embodiments, the above power supply system further includes a voltage detection component 50. Among them, the voltage detection component 50 includes a first resistor 51 and a second resistor 52; one end of the first resistor 51 is grounded, and the other end of the first resistor 51 is electrically connected to the MCU 40 and one end of the second resistor 52 respectively, and the other end of the second resistor 52 is electrically connected to two power output terminals respectively; among them, the resistance value of the first resistor 51 is less than the resistance value of the second resistor 52.

[0065] In some of these embodiments, the above voltage detection component further includes a third resistor 53 and a fourth resistor 54; among them, one end of the third resistor 53 is grounded, and the other end of the third resistor 53 is electrically connected to the MCU 40 and one end of the fourth resistor 54 respectively, and the other end of the fourth resistor 54 is electrically connected to the sides of the first electronic switch 31 and the second electronic switch 32 close to the external load respectively; among them, the resistance value of the third resistor 53 is the same as the resistance value of the first resistor 51, and the resistance value of the fourth resistor 54 is the same as the resistance value of the second resistor 52.

[0066] To ensure the electrical safety of the external load connected to the electronic switch, it is necessary to detect the voltage of each output passing through the electronic switch. Taking an input voltage of 12V as an example, each electronic switch divides the voltage to generate a static current of about 5uA. When the channel data corresponding to the electronic switch reaches 20 channels, the static current can reach 100uA. Therefore, when performing voltage detection, to ensure the safety of each electrical component involved in the detection circuit, it is necessary to divide the voltage using a voltage. Through the above settings, it is realized that the second resistor and the fourth resistor are used to perform resistance voltage division on the output voltage of this path to obtain a suitable voltage range, and then output it to the MCU acquisition port (the acquisition port collects the voltage through the first resistor and the third resistor) for measurement.

[0067] In some of these embodiments, the voltage detection component 50 further includes an analog electronic switch 55. Among them, one end of the analog electronic switch 55 is electrically connected to the first resistor 51 and the second resistor 52 respectively, and the other end is electrically connected to the third resistor 53 and the fourth resistor 54 respectively; among them, when the power supply system is in the working mode, the analog electronic switch 55 remains closed, and when the power supply system is in the standby mode, the analog electronic switch 55 remains open.

[0068] The above provides an optional solution for voltage acquisition and measurement, which can be applied to scenarios with low static current. When the PDU is in the standby mode, the MCU itself is also powered off and does not need to perform voltage acquisition operations. Therefore, when the PDU is in the standby mode, the analog electronic switch can be disconnected, that is, the electrical connection between the power output terminal and the voltage dividing resistor is disconnected, so as to reduce the static current (the current flowing through the voltage sampling circuit in the standby mode). When the PDU resumes the working mode, the power supply of the MCU returns to normal. At this time, keep the analog electronic switch 55 closed, and the acquisition of the output voltage of each switch can continue. It should be noted that when applied to scenarios where the requirement for static current is not very strict, the above analog electronic switch can also not be set, and only the above resistor is used for voltage division, so as to save costs.

[0069] In some of these embodiments, the power supply system further includes a voltage regulation circuit for regulating the voltage value input by the rechargeable battery 10; wherein, the voltage regulation circuit includes a first regulation circuit 61 and a second regulation circuit 62. The input end of the first regulation circuit 61 is electrically connected to the rechargeable battery 10, and the output end of the first regulation circuit 61 is respectively electrically connected to the first control circuit and the signal monitoring circuit 90; the input end of the second regulation circuit 62 is electrically connected to the rechargeable battery 10, and the output end of the second regulation circuit 62 is respectively electrically connected to the second control circuit and the MCU 40; wherein, when the power supply system is in the standby mode, the rechargeable battery 10 is disconnected from the second regulation circuit 62.

[0070] According to a specific implementation manner of the embodiment of the present invention, the voltage regulation circuit can select voltage regulator devices such as SBC (System Basis Chip) and LDO (Low Dropout Regulator). The voltage input by the rechargeable battery is regulated and then input to other electrical components, so as to achieve the purpose of ensuring the voltage compatibility of other electrical components, reducing power consumption, and protecting electrical components. Similarly, in order to reduce the power consumption of the PDU, the above voltage regulation circuit can select low-power devices, such as selecting MFS2613AMDA2AD as the model of the SBC, etc. It can be understood that the above models are not intended to limit the present invention, and other voltage regulators / voltage regulation circuits with low-power characteristics also belong to the scope protected by the present invention.

[0071] When the PDU is in the standby mode, disconnecting the electrical connection between the second regulation circuit and the rechargeable battery can stop the power supply of the electrical components corresponding to the second regulation circuit, thereby achieving the effect of reducing power consumption.

[0072] According to a specific embodiment of the present utility model, the output power supply of the rechargeable battery can be configured as working power and basic power. After the output basic power is adjusted for the voltage value through the first adjustment circuit, it is respectively supplied to electrical components such as the first control circuit and the signal monitoring circuit that still need to operate even in the PDU standby mode. After the output working power is adjusted for the voltage value through the second adjustment circuit, it is respectively supplied to electrical components such as the second control circuit and the MCU that do not need to operate in the PDU standby mode. When the PDU is in the standby mode, only the working power output by the rechargeable battery needs to be stopped, so that the corresponding electrical components can enter the sleep standby state, thereby reducing the power consumption of the PDU.

[0073] Figure 4 is a circuit block diagram between the rechargeable battery and the electrical components inside the power supply system in an embodiment of the embodiment of the present utility model. As Figure 4 shown, the rechargeable battery 10 outputs three paths of power to the electrical components inside the PDU. Among them, for the purposes of ensuring the voltage compatibility of the electrical components, reducing power consumption, and protecting the electrical components, the first path of power (basic power) and the second path of power (working power) need to adjust the output voltage value. Therefore, the rechargeable battery 10 first transports the first path of power and the second path of power to the first adjustment circuit 61 and the second adjustment circuit 62 respectively for voltage value adjustment, and then transports them to the corresponding electrical components respectively. At the same time, when the PDU is in the working mode, it is configured to keep the above two paths of power output simultaneously to meet the power consumption requirements of each electrical component inside the PDU. When the PDU is in the standby mode, only the output of the basic power is maintained, and the output of the working power is stopped (that is, when the PDU is in the standby mode, the power flowing through the first adjustment circuit 61 is maintained, and the power flowing through the second adjustment circuit 62 is stopped) to meet the power consumption requirements of the electrical components that still need to operate in the standby state. Specifically, after the basic power output by the rechargeable battery 10 is adjusted for the voltage value through the first adjustment circuit 61, it can supply power to the first control module 22 and the signal detection circuit 90 respectively, so that whether the PDU is in the working mode or the standby mode, the above electrical components can maintain power supply to meet their power consumption requirements; after the working power output by the rechargeable battery 10 is adjusted for the voltage value through the second adjustment circuit 62, it can supply power to the second control module 24 and the MCU 40 respectively. When the PDU is in the standby mode, the output of the working power can be stopped, that is, the power supply to the second control module 24 and the MCU 40 can be stopped, so that they stop working, thereby effectively reducing the power consumption. It should be noted that which electrical components inside the PDU the working power and basic power output by the rechargeable battery 10 are supplied to can also be adjusted according to the actual power consumption requirements of the electrical components.

[0074] In some of these embodiments, the power supply system further includes a communication module 70 and an analog front-end chip 80. Among them, the communication module 70 is electrically connected to the MCU 40 and the central controller 103 respectively; the analog front-end chip 80 is electrically connected to the MCU 40 and the rechargeable battery 10 respectively, and is used to obtain the battery parameters of the rechargeable battery. Among them, the battery parameters of the rechargeable battery include at least one of the working current, the cell voltage, and the battery temperature.

[0075] CAN (Controller Area Network, communication module) is a serial communication bus standard widely used in the automotive industry. In the intelligent electrical box PDU, it sends battery status, electronic switch status, load control information, etc. to the central controller, and at the same time receives instructions and parameter settings from the central controller. AFE (Analog Front End, analog front-end chip) is a bridge connecting sensors and digital processing systems. It is responsible for conditioning (amplifying, filtering, offset correction, etc.) the analog signals (such as voltage, current, temperature, etc.) from the sensors, converting them into a format suitable for digital circuit processing, and then performing digital sampling and processing by the MCU or SBC.

[0076] According to the embodiments of the present invention, different power consumption modes can be configured for the communication module and the analog front-end chip. For example, when the PDU is in the standby mode: configure the CAN module to enter the low-power sleep mode, and only retain the message wake-up function; the AFE enters the low-power sleep mode, and only retains the function of periodically detecting current, voltage, and temperature to judge whether the operation is normal. Thereby further reducing the standby power consumption of the PDU, enabling the PDU to operate in standby for a long time. As Figure 4 shown, the rechargeable battery 10 is also electrically connected to the communication module 70 and the analog front-end chip 80 to provide a third power supply path for the communication module 70 and the analog front-end chip 80, so that when the PDU is in different modes, it performs corresponding functions according to the configured power consumption mode.

[0077] The above power supply system provided by the embodiments of the present invention integrates the redundant circuit and the rechargeable battery in the power supply system. Since the redundant circuit can select at least one power supply path from the external power supply and the rechargeable battery, the power supply stability of the external load electrically connected to the power supply system is improved. At the same time, the two control circuits in the redundant circuit can be independently controlled in the working mode and standby mode of the power supply system, and the control operation of one control circuit can be stopped in the standby mode, thereby achieving the technical effect of effectively reducing the power consumption of the power supply system in the standby mode, further ensuring the long-term standby operation of the power supply system, and improving the energy utilization efficiency.

[0078] The embodiments of the present invention also provide an electrical box, as Figure 5As shown in the figure, the electrical box includes a box cover 501, a box body 502, and a printed circuit board 503. Among them, the redundant circuit 20, the first electronic switch 31, and the second electronic switch 32 of the power supply system described above are printed on the printed circuit board 503. The box cover 501 and the box body 502 form a closed space, and the printed circuit board 503 and the rechargeable battery 10 are arranged inside the box body 502.

[0079] The electrical box provided by the embodiment of the present invention realizes the integration of the rechargeable battery, the redundant circuit, and the electronic switch in the electrical box. Accordingly, the wire harness on the PCB (Printed Circuit Board) of the power supply system is lightened and the wire harness docking length is reduced, the electrical distribution path is simplified, zero maintenance during the life cycle of the electrical box is achieved, functional integration and miniaturized size design are realized, the service life of the product is extended. At the same time, the lightweight and maintenance-free design positively promotes the vehicle assembly and cost reduction, and also improves the central control ability and integration degree of the vehicle system. The matching work between the rechargeable battery and the electronic switch is realized through integrated control.

[0080] It should be noted that the term "including" and its variants used in the embodiments of the present invention are open-ended, that is, "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless clearly indicated otherwise in the context, it should be understood as "one or more".

[0081] The term "embodiment" in this specification means that the specific features, structures, or characteristics described in combination with the embodiment may be included in at least one embodiment of the present invention. The phrase appears in various positions in the specification does not necessarily mean the same embodiment, nor does it mean being independent or alternative to other embodiments and mutually exclusive. The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments are referred to each other. In particular, for device, equipment, and system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiments.

[0082] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the protection scope. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several variations and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the appended claims.

Claims

1. A power supply system, characterized in that: include: A rechargeable battery (10), a redundant circuit (20), a first electronic switch (31) and a second electronic switch (32); wherein: The redundant circuit (20) comprises two power input terminals, two power output terminals and two control circuits; wherein the two power input terminals are electrically connected to the output terminal of the rechargeable battery (10) and the output terminal of the external power supply (101), respectively; The two power supply output ends are electrically connected to one end of the first electronic switch (31) and one end of the second electronic switch (32), respectively; The two control circuits are used to select at least one of the external power source (101) and the rechargeable battery (10) to supply power to the two power output ends; The other ends of the first electronic switch (31) and the second electronic switch (32) are electrically connected to an external load (102) respectively.

2. The power supply system according to claim 1, characterized in that: In the two control circuits: The first control circuit comprises a first switch (21) and a first control module (22), and the second control circuit comprises a second switch (23) and a second control module (24); wherein one end of the first control module (22) is electrically connected to the first switch (21), one end of the second control module (24) is electrically connected to the second switch (23), and the other ends of the first control module (22) and the second control module (24) are both electrically connected to the rechargeable battery (10); When the power supply system is in working mode, the rechargeable battery (10) is electrically connected to the first control module (22) and the second control module (24) respectively; When the power supply system is in standby mode, the rechargeable battery (10) remains electrically connected to the first control module (22) and is electrically disconnected from the second control module (24).

3. The power supply system according to claim 2, characterized in that: In the two control circuits: The first control module (22) is electrically connected to the input end and the output end of the first switch (21) and the gate of the MOS tube in the first switch (21), and the second control module (24) is electrically connected to the input end and the output end of the second switch (23) and the gate of the MOS tube in the second switch (23); wherein: The first switch (21) and the second switch (23) each include at least one group of MOS switch tubes; wherein each group of MOS switch tubes includes a first MOS tube and a second MOS tube, and the source of the first MOS tube is connected in series with the source of the second MOS tube.

4. The power supply system according to claim 1, characterized in that: In the two power output terminals: The first power supply output terminals are electrically connected to at least two first electronic switches (31) respectively, and / or, The second power supply output terminals are electrically connected to at least two second electronic switches (32) respectively.

5. The power supply system according to claim 1, characterized in that: The power supply system further comprises an MCU (40), wherein the MCU (40) is electrically connected to the rechargeable battery (10); wherein when the power supply system is in a standby mode, the rechargeable battery (10) is electrically disconnected from the MCU (40).

6. The power supply system according to claim 5, characterized in that: The power supply system further comprises a voltage detection component (50), wherein the voltage detection component comprises a first resistor (51) and a second resistor (52); One end of the first resistor (51) is grounded, the other end of the first resistor (51) is electrically connected to one end of the MCU (40) and the second resistor (52) respectively, and the other end of the second resistor (52) is electrically connected to the two power supply output ends respectively; wherein the resistance value of the first resistor (51) is smaller than the resistance value of the second resistor (52).

7. The power supply system according to claim 6, characterized in that: The voltage detection component further comprises a third resistor (53), a fourth resistor (54) and an analog electronic switch (55); wherein: One end of the third resistor (53) is grounded, the other end of the third resistor (53) is electrically connected to one end of the MCU (40) and the fourth resistor (54), respectively, and the other end of the fourth resistor (54) is electrically connected to one side of the first electronic switch (31) and the second electronic switch (32) close to the external load, respectively; wherein the resistance value of the third resistor (53) is consistent with the resistance value of the first resistor (51), and the resistance value of the fourth resistor (54) is consistent with the resistance value of the second resistor (52); One end of the analog electronic switch (55) is electrically connected to the first resistor (51) and the second resistor (52), respectively, and the other end of the analog electronic switch (55) is electrically connected to the third resistor (53) and the fourth resistor (54), respectively; wherein, when the power supply system is in working mode, the analog electronic switch (55) remains closed, and when the power supply system is in standby mode, the analog electronic switch (55) remains open.

8. The power supply system according to claim 1, characterized in that: The power supply system further comprises a voltage regulating circuit for regulating the voltage value inputted by the rechargeable battery (10); wherein the voltage regulating circuit comprises a first regulating circuit (61) and a second regulating circuit (62); the input end of the first regulating circuit (61) is electrically connected to the rechargeable battery (10); and the output end of the first regulating circuit (61) is electrically connected to the first control circuit and the signal monitoring circuit (90), respectively; The input end of the second regulating circuit (62) is electrically connected to the rechargeable battery (10), and the output end of the second regulating circuit (62) is electrically connected to the second control circuit and the MCU (40) respectively; wherein, when the power supply system is in standby mode, the rechargeable battery (10) is electrically disconnected from the second regulating circuit (62).

9. The power supply system according to claim 1, characterized in that: The power supply system further comprises a communication module (70) and an analog front-end chip (80); wherein: The communication module (70) is electrically connected to the MCU (40) and the central controller (103) respectively; the analog front-end chip (80) is electrically connected to the MCU (40) and the rechargeable battery (10) respectively, and is used to obtain battery parameters of the rechargeable battery (10).

10. The power supply system according to claim 1, characterized in that: When the power supply system is in the working mode, the second electronic switch (32) remains open.

11. An electrical box, characterized in that: The electrical box comprises a box cover (501), a box body (502) and a printed circuit board (503); wherein the redundant circuit (20), the first electronic switch (31) and the second electronic switch (32) of the power supply system according to any one of claims 1 to 10 are printed on the printed circuit board (503); the box cover (501) and the box body (502) form a closed space; the printed circuit board (503) and the rechargeable battery (10) are arranged in the box body (502).

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