Power supply system and battery management system

Abstract

Disclosed in the present disclosure are a power supply system and a battery management system. The power supply system comprises: an input power supply used for providing an input voltage; a first voltage conversion circuit connected to an output end of the input power supply and used for carrying out voltage conversion on the input voltage provided by the input power supply to generate a first supply voltage; a second voltage conversion circuit used for carrying out voltage conversion on the first supply voltage to obtain a second supply voltage; and at least one voltage stabilizing circuit connected to at least one of the output end of the input power supply, an output end of the first voltage conversion circuit and an output end of the second voltage conversion circuit and used for carrying out voltage conversion on at least one of the input voltage, the first supply voltage and the second supply voltage to obtain at least one third supply voltage.

Description

Power supply system and battery management system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on the Chinese patent application with application number 202323184282.9, application date November 23, 2023, and invention name “Power Supply System and Battery Management System”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this disclosure as a reference. Technical Field

[0003] The present disclosure relates to the field of power supply control, and in particular to a power supply system and a battery management system. Background Art

[0004] A system base chip (SBC) is a power integrated chip that can be used to manage, control, regulate, and monitor power outputs of multiple voltage specifications, providing the power supply required by different functional circuits in the device.

[0005] In related technologies, SBCs perform a voltage conversion on the input power voltage through different buck-boost conversion modules or voltage stabilization modules, converting the input power voltage into multiple supply voltages. However, SBCs on new energy vehicles are generally expensive and are subject to market supply and demand. Users may face the disadvantages of high supply risks and high costs.

[0006] Summary of the Invention

[0007] The present disclosure mainly provides a power supply system and a battery management system. Through multiple voltage conversion methods, it can not only use a separate multi-stage power supply system to replace the function of SBC and provide multiple power supply voltages, but also reduce the hardware cost of the product and improve the circuit stability and design flexibility.

[0008] The technical solution of the present disclosure is achieved as follows:

[0009] In a first aspect, an embodiment of the present disclosure provides a power supply system, the power supply system comprising:

[0010] Input power supply, used to provide input voltage;

[0011] a first voltage conversion circuit, connected to the output terminal of the input power supply, for performing voltage conversion on an input voltage provided by the input power supply to generate a first supply voltage;

[0012] a second voltage conversion circuit, connected to the output end of the first voltage conversion circuit, for performing voltage conversion on the first supply voltage to obtain a second supply voltage;

[0013] At least one voltage stabilizing circuit is respectively connected to at least one of the output end of the input power supply, the output end of the first voltage conversion circuit, and the output end of the second voltage conversion circuit, and is used to perform voltage conversion on at least one of the input voltage, the first supply voltage, and the second supply voltage to obtain at least one third supply voltage.

[0014] Through the above-mentioned technical means, the input voltage is converted through the first voltage conversion circuit, and then converted into multiple branches through the second voltage conversion circuit and at least one voltage stabilizing circuit to provide the first power supply voltage, the second power supply voltage and at least one third power supply voltage to the power modules with different voltage requirements. This not only increases the range and number of specifications of the power supply voltage, meets the power voltage requirements of different modules, but also improves the accuracy and stability of voltage regulation.

[0015] In some embodiments, the at least one voltage stabilization circuit includes a first voltage stabilization circuit, wherein:

[0016] The first voltage stabilizing circuit is connected to the output end of the first voltage conversion circuit and is used for performing voltage conversion on the first supply voltage to obtain a third supply voltage.

[0017] Through the above technical means, the first power supply voltage is converted through the first voltage stabilizing circuit to provide a third power supply voltage to the power-consuming module, thereby meeting the voltage requirements of different power-consuming modules and improving the flexibility of the power supply system.

[0018] In some embodiments, the at least one voltage stabilization circuit includes a second voltage stabilization circuit, wherein:

[0019] The second voltage stabilizing circuit is connected to the output end of the second voltage conversion circuit and is used for performing voltage conversion on the second supply voltage to obtain a third supply voltage.

[0020] Through the above technical means, the second power supply voltage is converted through the second voltage stabilizing circuit to provide a third power supply voltage to the power-consuming module, thereby meeting the voltage requirements of different power-consuming modules and improving the flexibility of the power supply system.

[0021] In some embodiments, the at least one voltage stabilization circuit includes a third voltage stabilization circuit, wherein:

[0022] The third voltage stabilizing circuit is connected to the output end of the input power supply and is used for performing voltage conversion on the input voltage to obtain a third power supply voltage.

[0023] Through the above technical means, the input voltage is converted through the third voltage stabilizing circuit to provide a third power supply voltage to the power-consuming module, thereby meeting the voltage requirements of different power-consuming modules and improving the flexibility of the power supply system.

[0024] In some embodiments, the at least one voltage stabilization circuit further includes a fourth voltage stabilization circuit, wherein:

[0025] The fourth voltage stabilizing circuit is connected to the output end of the third voltage stabilizing circuit and is used for performing voltage conversion on the third power supply voltage output by the third voltage stabilizing circuit to obtain a fourth power supply voltage.

[0026] Through the above technical means, the third power supply voltage is converted through the fourth voltage stabilizing circuit to provide the fourth power supply voltage to the power-consuming module, thereby meeting the voltage requirements of different power-consuming modules and improving the flexibility of the power supply system.

[0027] In some embodiments, the power supply system further includes a detection circuit, wherein:

[0028] The detection circuit is connected to the output end of the power module in the power supply system and is used to detect the output signal of the power module; wherein the power module includes at least one of the following: a first voltage conversion circuit, a second voltage conversion circuit and at least one voltage stabilizing circuit.

[0029] Through the above technical means, the detection circuit detects one or more circuits in the power module to avoid abnormal output signals, protect the power-consuming module, and improve the safety of the power supply system.

[0030] In some embodiments, the detection circuit includes at least one voltage sampling circuit, wherein:

[0031] At least one voltage sampling circuit is connected to the output end of the power module respectively, and is used to perform voltage sampling detection on the output signal of the power module to obtain at least one voltage sampling signal;

[0032] The output signal of the power supply module includes at least one of the following: a first power supply voltage, a second power supply voltage and at least one third power supply voltage.

[0033] Through the above technical means, the voltage sampling circuit is used to perform voltage sampling and detection on the output signals output by one or more circuits in the power module, thereby preventing the output signal voltage from being too high or too low and causing damage to the power-consuming module, thereby improving the safety of the power supply system.

[0034] In some embodiments, the voltage sampling circuit includes a first resistor, a second resistor, a third resistor, and a first capacitor, wherein:

[0035] A first end of the first resistor is connected to the output end of the power module, a second end of the first resistor is connected to the first end of the second resistor and the first end of the third resistor respectively, a second end of the second resistor is grounded, and a second end of the first capacitor is grounded;

[0036] The second end of the third resistor is connected to the first end of the first capacitor and is used to output a voltage sampling signal.

[0037] Through the above technical means, voltage sampling is performed using a voltage divider resistor method to avoid damage to the power-consuming module caused by the output signal voltage being too high or too low, thereby improving the safety of the power supply system.

[0038] In some embodiments, the detection circuit includes at least one current sampling circuit, wherein:

[0039] At least one current sampling circuit is connected to the output end of the power module respectively, and is used to perform current sampling detection on the output signal of the power module to obtain at least one current sampling signal;

[0040] The output signal of the power module includes at least one of the following: a first power supply current output by the first voltage conversion circuit, a second power supply current output by the second voltage conversion circuit, and at least one third power supply current output by at least one voltage stabilization circuit.

[0041] Through the above technical means, current sampling and detection are performed on the output signals of one or more circuits in the circuit of the power module to avoid damage to the power-consuming module caused by the current value of the output signal being too high or too low, thereby improving the safety of the power supply system.

[0042] In some embodiments, the first voltage conversion circuit is also used to receive a wake-up signal, and when the wake-up signal is at a low level, control the first voltage conversion circuit to be in a disconnected state to power off the power supply system; or, when the wake-up signal is at a high level, control the first voltage conversion circuit to be in a working state to power on the power supply system.

[0043] Through the above technical means, the first voltage conversion circuit is controlled by the wake-up signal, and then the power-on and power-off of the power supply system are controlled, so that the power supply system can enter a lower power consumption state as much as possible when it does not need to work, thereby saving the power consumption of the power supply system.

[0044] In some embodiments, the power supply system further includes an enabling circuit, which is connected to an enabling terminal of the second voltage conversion circuit and an enabling terminal of at least one voltage stabilizing circuit, respectively, wherein:

[0045] an enabling circuit, configured to send a first enabling signal to the second voltage conversion circuit, and control powering on or off the second voltage conversion circuit according to the first enabling signal;

[0046] The enabling circuit is further configured to send a respective second enabling signal to at least one voltage stabilizing circuit, and control power-up or power-down of the at least one voltage stabilizing circuit according to the second enabling signal.

[0047] Through the above technical means, the enable signal output by the enable circuit controls the power on or off of the second voltage conversion circuit and at least one voltage stabilizing circuit respectively, thereby reducing the power consumption of the power supply system and improving the flexibility of the power supply system.

[0048] In some embodiments, the first voltage conversion circuit and the second voltage conversion circuit are buck-boost DC conversion circuits.

[0049] Through the above technical means, the first voltage conversion circuit and the second voltage conversion circuit are set as buck-boost DC conversion circuits to supply power to power modules requiring DC voltage, thereby meeting the power supply requirements of different power modules.

[0050] In a second aspect, an embodiment of the present disclosure provides a battery management system, the battery management system comprising at least one functional circuit and a power supply system as in the first aspect;

[0051] The power supply system is used to provide the power supply required by at least one functional circuit.

[0052] Through the above technical means, the power supply system provides power supply to at least one functional circuit, meets the power demand of at least one functional circuit, and improves the accuracy and stability of the power supply in the battery management system.

[0053] The present disclosure provides a power supply system and a battery management system, which convert the input voltage into a first power supply voltage, a second power supply voltage and at least one third power supply voltage respectively through different voltage conversion combinations between a first voltage conversion circuit, a second voltage conversion circuit and a voltage stabilization circuit. In this way, not only can a separate multi-stage power supply system be used to replace the function of an SBC, providing multiple power supply voltages and improving the stability and flexibility of the circuit, but it also saves the circuit design hardware cost and solves the problem of SBC supply risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] FIG1 is a schematic diagram of the composition structure of an SBC chip;

[0055] FIG2 is a schematic diagram of a first structure of a power supply system provided by an embodiment of the present disclosure;

[0056] FIG3 is a second schematic diagram of the structure of a power supply system provided by an embodiment of the present disclosure;

[0057] FIG4 is a third schematic diagram of the structure of a power supply system provided by an embodiment of the present disclosure;

[0058] FIG5 is a fourth structural diagram of a power supply system provided by an embodiment of the present disclosure;

[0059] FIG6 is a schematic diagram of a first structure of a voltage sampling circuit provided by an embodiment of the present disclosure;

[0060] FIG7 is a second schematic diagram of the structure of a voltage sampling circuit provided in an embodiment of the present disclosure;

[0061] FIG8 is a first schematic diagram of the structure of a current sampling circuit provided by an embodiment of the present disclosure;

[0062] FIG9 is a second schematic diagram of the structure of a current sampling circuit provided in an embodiment of the present disclosure;

[0063] FIG10 is a fifth structural diagram of a power supply system provided by an embodiment of the present disclosure;

[0064] FIG11 is a schematic diagram of the structure of a battery management system provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0065] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure is described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference only and are not intended to limit the embodiments of the present disclosure.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art in the art of the present disclosure. The terms used herein are only for the purpose of describing the embodiments of the present disclosure and are not intended to limit the present disclosure.

[0067] In the following description, reference is made to “some embodiments”, which describes a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0068] It should also be pointed out that the terms "first\second\third" involved in the embodiments of the present disclosure are only used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present disclosure described herein can be implemented in an order other than that illustrated or described herein.

[0069] In a battery management system (BMS), multiple power supplies with different voltages are required to power each module. This function is typically implemented by an SBC chip, an integrated chip that integrates wake-up, diagnostics, reset, and power output functions. SBCs typically provide multiple external interfaces for outputting different voltages to different modules.

[0070] Figure 1 is a schematic diagram of the structure of an SBC chip. As shown in Figure 1, the SBC chip 101 can include multiple modules for voltage conversion, including a buck-boost module 1014, also known as a Buck / Boost module, for stepping down the input power voltage to power other modules in the BMS. For example, the input power source can be a battery with a voltage range of 11-15V. The output voltage of the buck-boost module 1014 can be 7V or 5V. A first voltage regulator module 1015, also known as an LDO_uC module, is used to stabilize and step down the input power voltage to power the main chip in the BMS. A second voltage regulator module 1016, also known as an LDO_Com module, is used to stabilize and step down the input power voltage to power the communication module in the BMS. A third voltage regulator module 1018, also known as an LDO_Ref module, is used to stabilize and step down the input power voltage to power the amplifier module. It can be understood that the output voltages of the first voltage stabilizing module 1015 , the second voltage stabilizing module 1016 , and the third voltage stabilizing module 1018 can be set according to the voltage requirements of the functional circuit, hereinafter also referred to as the power module, and can be 5V or 7V, for example.

[0071] In related art, the SBC chip 101 may further include a wake-up input module 1011 , also referred to as a Wake Input module, configured to receive an externally input wake-up signal and start the SBC chip.

[0072] The SBC chip 101 may further include a diagnosis module 1012, which may also be referred to as a Diagnosis module, configured to determine whether an abnormality occurs in the operating state of the SBC chip.

[0073] The SBC chip 101 may further include a reset module 1013 , also referred to as a Watchdog / Reset module, configured to restart or reset the SBC chip when an abnormality occurs in the operation of the SBC chip.

[0074] The SBC chip 101 may further include a tracking module 1017 , also referred to as a Tracker module, for networking and communication with other modules in the BMS.

[0075] Although the use of the aforementioned SBC chip in a BMS can power multiple power modules with different voltage requirements, the SBCs currently used in new energy vehicles are generally expensive and subject to market supply and demand constraints, which can lead to high supply risks and high costs for users. Therefore, the design of a separate multi-stage power supply system is particularly important.

[0076] Based on the above technical problems, the embodiments of the present disclosure provide a power supply system and a battery management system, which can convert the input voltage into a first power supply voltage, a second power supply voltage and at least one third power supply voltage respectively through different voltage conversion combinations between a first voltage conversion circuit, a second voltage conversion circuit and at least one voltage stabilizing circuit. In this way, not only can a separate multi-stage power supply system be used to replace the function of the SBC and provide multiple power supply voltages, but it also reduces the hardware cost of the product and improves the stability and design flexibility of the circuit.

[0077] The present disclosure is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0078] FIG2 is a schematic diagram of the structure of a power supply system provided by an embodiment of the present disclosure. As shown in FIG2 , the power supply system 20 may include:

[0079] An input power supply 201, configured to provide an input voltage;

[0080] A first voltage conversion circuit 202 is connected to the output terminal of the input power supply 201 and is used to convert the input voltage provided by the input power supply 201 to generate a first supply voltage;

[0081] A second voltage conversion circuit 203, connected to the output terminal of the first voltage conversion circuit 202, for performing voltage conversion on the first supply voltage to obtain a second supply voltage;

[0082] At least one voltage stabilizing circuit 204 is respectively connected to at least one of the output end of the input power supply 201, the output end of the first voltage conversion circuit 202, and the output end of the second voltage conversion circuit 203, and is used to perform voltage conversion on at least one of the input voltage, the first supply voltage, and the second supply voltage to obtain at least one third supply voltage.

[0083] In the embodiment of the present disclosure, the input power source 201 may be a battery with a voltage range of 11 V to 15 V. The positive terminal of the battery, i.e., the KL30 terminal, may be connected to the input terminal of the first voltage conversion circuit 202 to provide the first voltage conversion circuit 202 with an input voltage in the range of 11 V to 15 V.

[0084] It is understandable that the voltage range of the battery serving as the input power source 201 may also be other values, which are specifically determined according to the voltage requirements of the power consumption modules in the BMS.

[0085] In the embodiment of the present disclosure, the first voltage conversion circuit 202 may perform voltage conversion on the input voltage provided by the input power source 201 to generate a first supply voltage.

[0086] The first voltage conversion circuit 202 can be a buck-boost converter, capable of stepping down or stepping up the input voltage and outputting a stable voltage that is less than or greater than the input voltage as the first supply voltage. It is understood that, depending on the voltage conversion requirements of different specific scenarios, the first voltage conversion circuit 202 can also be a more efficient buck converter, used only to step down the input voltage; or a boost converter, used only to step up the input voltage.

[0087] In the disclosed embodiment, the input power supply 201 is a DC power supply. If the power consumption module in the BMS also uses a DC voltage, the first voltage conversion circuit 202 can be a DC-DC type buck-boost converter. It is understood that, depending on the voltage type of the input power supply 201 and the power consumption module, the first voltage conversion circuit 202 can also be a DC-AC type buck-boost converter, an AC-DC type buck-boost converter, or an AC-AC type buck-boost converter.

[0088] For example, when the input power source 201 is a battery, the input voltage range provided to the first voltage conversion circuit 202 through the KL30 terminal may be 11V to 15V. After voltage conversion by the first voltage conversion circuit 202 , the output first supply voltage may be 7.0V.

[0089] In the embodiment of the present disclosure, the second voltage conversion circuit 203 may perform voltage conversion on the first supply voltage to obtain the second supply voltage.

[0090] In the embodiment of the present disclosure, the second voltage conversion circuit 203 can be a buck-boost converter of the same type as the first voltage conversion circuit 202, or a buck-boost converter of a different type from the first voltage conversion circuit 202, depending on the voltage conversion requirements.

[0091] After the first voltage conversion circuit 202 converts the input voltage once, the output first supply voltage may still not meet the voltage requirements of some power-consuming modules due to the voltage conversion range. In this case, the second voltage conversion circuit 203 can perform another voltage conversion on the first supply voltage, further boosting or stepping down the first supply voltage to output a second supply voltage.

[0092] For example, if the first supply voltage output by the first voltage conversion circuit 202 is 7.0V, the second supply voltage output by the second voltage conversion circuit 203 may be 3.3V after voltage conversion.

[0093] In the embodiment of the present disclosure, at least one voltage stabilizing circuit 204 may be configured to perform voltage conversion on at least one of the input voltage, the first supply voltage, and the second supply voltage to obtain at least one third supply voltage.

[0094] The voltage stabilizing circuit 204 may be a low dropout regulator (LDO), which is a DC or AC regulator that can step down and stabilize an input voltage.

[0095] As shown in FIG2 , the voltage stabilizing circuit 204 can include multiple types, each of which is connected to the output terminal of a different circuit, such as a first voltage stabilizing circuit 2041, a second voltage stabilizing circuit 2042, and a third voltage stabilizing circuit 2043. Each voltage stabilizing circuit 204 can also include multiple circuits that output different supply voltages. Below, taking the example of each of the first voltage stabilizing circuit 2041, the second voltage stabilizing circuit 2042, and the third voltage stabilizing circuit 2043 as one, the connection method of each type of voltage stabilizing circuit 204 is described.

[0096] In the disclosed embodiment, a first voltage stabilizing circuit 2041 may be connected to the output terminal of the first voltage conversion circuit 202 to convert the first supply voltage to obtain at least one third supply voltage. It is understood that the third supply voltages output by different voltage stabilizing circuits 204 may have different voltages. For example, if the first supply voltage is 7.0V, after being stepped down and stabilized by the voltage stabilizing circuit 204, the output third supply voltage may be 5.0V.

[0097] In the disclosed embodiment, a second voltage stabilizing circuit 2042 may also be provided, connected to the output terminal of the second voltage conversion circuit 203, to convert the second supply voltage to obtain at least one third supply voltage. It is understood that the third supply voltages output by different voltage stabilizing circuits 204 may have different voltages. For example, if the second supply voltage is 3.3V, after voltage stabilizing circuit 204 steps down and stabilizes the voltage, the output third supply voltage may be 1.2V.

[0098] In the disclosed embodiment, a third voltage stabilizing circuit 2043 may be provided, connected to the output terminal of the input power supply 201, to convert the input voltage to generate at least one third supply voltage. It is understood that the third supply voltage output by different voltage stabilizing circuits 204 may vary. For example, when the input power supply 201 is a battery with a voltage range of 11V to 15V, after voltage stabilization by the voltage stabilizing circuit 204, the output third supply voltage may be 5.0V.

[0099] It should be noted that the multiple third voltage stabilizing circuits 2043 in the voltage stabilizing circuit 204 can be connected to the output end of the above-mentioned input power supply 201, the multiple first voltage stabilizing circuits 2041 in the voltage stabilizing circuit 204 can be connected to the output end of the first voltage conversion circuit 202, and the multiple second voltage stabilizing circuits 2042 in the voltage stabilizing circuit 204 can be connected to the output end of the second voltage conversion circuit 203. The connection method and quantity are determined according to the needs of the power module, and the embodiments of the present disclosure are not listed one by one here.

[0100] It can be understood that the power module can be connected to one of the output ends of the input power supply 201, the output end of the first voltage conversion circuit 202, the output end of the second voltage conversion circuit 203, and the output end of the voltage stabilizing circuit 204 according to the voltage requirements, and can be connected to the input voltage provided by any of the above output ends, or the first power supply voltage, or the second power supply voltage, or the third power supply voltage.

[0101] An embodiment of the present disclosure provides a power supply system, which converts the input voltage through a first voltage conversion circuit, and then converts it into multiple branches through a second voltage conversion circuit and at least one voltage stabilization circuit, to provide a first power supply voltage, a second power supply voltage and at least one third power supply voltage to power modules with different voltage requirements. This not only increases the range and number of specifications of the power supply voltage, meets the power voltage requirements of different modules, but also improves the accuracy and stability of voltage regulation.

[0102] In another embodiment of the present disclosure, FIG3 is a second schematic diagram of the structure of a power supply system provided in an embodiment of the present disclosure. As shown in FIG3 , the at least one voltage stabilizing circuit 204 may include a first voltage stabilizing circuit 2041 , wherein the first voltage stabilizing circuit 2041 is connected to the output end of the first voltage conversion circuit 202 and is configured to convert the first supply voltage to obtain a third supply voltage.

[0103] As in the aforementioned embodiment, there can be multiple first voltage-stabilizing circuits 2041, and the voltage values ​​of the output third supply voltages can be the same or different. For example, as shown in FIG3 , the first voltage-stabilizing circuit 20411 can be referred to as an LDO_uC module, configured to output a 5.0V third supply voltage to the main chip; the first voltage-stabilizing circuit 20412 can be referred to as an LDO_communication module, configured to output a 5.0V third supply voltage to the communication module; and the first voltage-stabilizing circuit 20413 can be referred to as an LDO_Analog module, configured to output a 5.0V third supply voltage to the analog module.

[0104] It will be appreciated that, to achieve independent control over the power-on and power-off of each power-consuming module, the third supply voltage output by the first voltage-stabilizing circuit 20411, the first voltage-stabilizing circuit 20412, and the first voltage-stabilizing circuit 20413 can have the same voltage value and be input to multiple power-consuming modules with the same voltage requirement. Alternatively, the third supply voltage output by these circuits can have different voltage values ​​and be input to multiple power-consuming modules with different voltage requirements. Furthermore, to save space, multiple power-consuming modules with the same voltage requirement can be combined and powered by the same first voltage-stabilizing circuit 2041.

[0105] In some embodiments, referring to FIG3 , the at least one voltage stabilizing circuit 204 may include a second voltage stabilizing circuit 2042 , wherein the second voltage stabilizing circuit 2042 is connected to the output end of the second voltage conversion circuit 203 and is configured to perform voltage conversion on the second supply voltage to obtain a third supply voltage.

[0106] Multiple second voltage stabilizing circuits 2042 can be provided, as shown in Figure 3. In the embodiment of the present disclosure, a single second voltage stabilizing circuit 2042 is used as an example. After the input voltage provided by the input power supply 201 undergoes two voltage conversions by the first voltage conversion circuit 202 and the second voltage conversion circuit 203, the output second supply voltage may still not meet the voltage requirements of some power-consuming modules due to voltage drop. The second voltage stabilizing circuit 2042 can further convert the second supply voltage to output a third supply voltage to the power-consuming device.

[0107] Exemplarily, the second voltage stabilizing circuit 2042 may be an LDO_Core module, configured to output a third power supply voltage of 1.2V to the core power module.

[0108] In some embodiments, as shown in FIG3 , the at least one voltage stabilizing circuit 204 includes a third voltage stabilizing circuit 2043 , wherein the third voltage stabilizing circuit 2043 is connected to the output end of the input power supply 201 and is configured to perform voltage conversion on the input voltage to obtain a third supply voltage.

[0109] Multiple third voltage stabilizing circuits 2043 can be provided, as shown in FIG3 . The embodiment of the present disclosure uses a single third voltage stabilizing circuit 2043 as an example. The third voltage stabilizing circuit 2043 can be directly connected to the output terminal of the input power supply 201. When the first supply voltage output by the first voltage conversion circuit 202 and the second supply voltage output by the second voltage conversion circuit 203 cannot meet the voltage requirements of the power-consuming module, the third voltage stabilizing circuit 2043 can directly convert the input voltage within the voltage drop range of the input voltage and output a third supply voltage.

[0110] Exemplarily, the third voltage stabilizing circuit 2043 may be an LDO_CAN module, configured to output a third power supply voltage of 5.0V to a controller area network (CNA) communication module.

[0111] In addition, the third voltage stabilizing circuit 2043 directly steps down the input voltage provided by the input power supply 201. Therefore, after the first voltage conversion circuit 202, the second voltage conversion circuit 203 and at least one voltage stabilizing circuit 204 are powered off, the third voltage stabilizing circuit 2043 can output a third power supply voltage to the power-consuming module to meet the load power supply requirements when the power supply system 20 is in sleep mode.

[0112] In some embodiments, as shown in Figure 3, the at least one voltage stabilizing circuit 204 further includes a fourth voltage stabilizing circuit 2044, wherein the fourth voltage stabilizing circuit 2044 is connected to the output end of the third voltage stabilizing circuit 2043 and is used to perform voltage conversion on the third power supply voltage output by the third voltage stabilizing circuit 2043 to obtain a fourth power supply voltage.

[0113] Multiple fourth voltage stabilizing circuits 2044 can be provided. As shown in FIG3 , the embodiment of the present disclosure uses a single fourth voltage stabilizing circuit 2044 as an example. The fourth voltage stabilizing circuit 2044 can be connected to the output terminal of the third voltage stabilizing circuit 2043 to further step down the third supply voltage and output a fourth supply voltage to the electrical device.

[0114] Illustratively, the fourth voltage stabilization circuit 2044 may be an LDO_RTC module, configured to provide a fourth power supply voltage of 3.3V to a real time clock (RTC).

[0115] It should be noted that the number and output voltage range of the first voltage stabilizing circuit 2041, the second voltage stabilizing circuit 2042, the third voltage stabilizing circuit 2043, and the fourth voltage stabilizing circuit 2044 shown in FIG3 are merely examples. The actual number and output voltage range can be determined based on the specific circumstances of the power-consuming module. For example, the output end of the aforementioned voltage stabilizing circuit can be further connected to at least one other voltage stabilizing circuit, which is not specifically listed here.

[0116] An embodiment of the present disclosure provides a power supply system, including a first voltage stabilizing circuit, a second voltage stabilizing circuit, a third voltage stabilizing circuit, and a fourth voltage stabilizing circuit, so that the input voltage is converted through the voltage of a multi-branch voltage stabilizing circuit and multiple third power supply voltages are output, thereby meeting the voltage requirements of different power modules and improving the flexibility of the power supply system.

[0117] In another embodiment of the present disclosure, FIG4 is a third schematic diagram of the structure of a power supply system provided in an embodiment of the present disclosure. As shown in FIG4 , the power supply system 20 further includes a detection circuit 206 , wherein the detection circuit 206 is connected to the output terminal of the power module 205 in the power supply system 20 and is configured to detect the output signal of the power module 205 ; wherein the power module 205 includes at least one of the following: a first voltage conversion circuit 202 , a second voltage conversion circuit 203 , and at least one voltage stabilization circuit 204 .

[0118] The power supply system 20 may also be provided with a detection circuit 206, which may also be called a Diagnosis module. By setting a detection point at the output end of any one of the first voltage conversion circuit 202, the second voltage conversion circuit 203 and the at least one voltage stabilizing circuit 204, the current, voltage, temperature or other output signal output by any of the above circuits is sampled, so that the detection circuit 206 can accurately determine the output current value, voltage value and other information to avoid abnormal output of the power supply system 20.

[0119] The detection circuit 206 can be a multimeter capable of detecting voltage and current, an oscilloscope that displays voltage and current waveforms, a current clamp meter that can detect voltage and current, or other circuits that can detect voltage and current, which are not listed here in this disclosure.

[0120] It can be understood that the detection circuit 206 can perform comprehensive detection on the signals output by one of the first voltage conversion circuit 202, the second voltage conversion circuit 203 and at least one voltage stabilizing circuit 204, or multiple of them, or all of the circuits. Figure 4 uses the detection circuit 206 to detect all of the above circuits as an example for explanation. The actual connection is determined according to the specific detection requirements.

[0121] In some embodiments, FIG5 is a fourth schematic diagram of the structure of a power supply system provided by an embodiment of the present disclosure. As shown in FIG5 , the detection circuit 206 includes at least one voltage sampling circuit 2061 , wherein: at least one voltage sampling circuit 2061 is respectively connected to the output terminal of the power module 205 and is configured to perform voltage sampling detection on the output signal of the power module 205 to obtain at least one voltage sampling signal; wherein the output signal of the power module 205 includes at least one of the following: a first supply voltage, a second supply voltage, and at least one third supply voltage.

[0122] It will be appreciated that FIG5 illustrates only one connection method between the voltage sampling circuit 2061 and the power module 205. The number of voltage sampling circuits 2061 can be adjusted based on actual functional safety requirements. Furthermore, a voltage sampling circuit 2061 can be provided at the output of each circuit in the power module 205, based on the values ​​of the first, second, and third supply voltages in the output signal. The circuit performs voltage sampling and detection on the output signal of each circuit, outputting at least one voltage sampling signal.

[0123] The voltage sampling circuit 2061 may be a voltage-dividing resistor sampling circuit, or a battery sampling chip (analog front end, AFE) in a BMS capable of collecting voltage signals, or other circuits capable of collecting voltage signals.

[0124] In some embodiments, FIG6 is a schematic diagram of the first structure of a voltage sampling circuit provided in an embodiment of the present disclosure. Referring to FIG6 , the voltage sampling circuit 2061 includes a first resistor 20611, a second resistor 20612, a third resistor 20613, and a first capacitor 20614. The first end of the first resistor 20611 is connected to the output terminal of the power module 205, the second end of the first resistor 20611 is connected to the first end of the second resistor 20612 and the first end of the third resistor 20613, respectively. The second end of the second resistor 20612 is grounded, and the second end of the first capacitor 20614 is grounded. The second end of the third resistor 20613 is connected to the first end of the first capacitor 20614 for outputting a voltage sampling signal.

[0125] The voltage sampling circuit 2061 can use a voltage divider resistor for sampling. When the voltage sampling circuit 2061 is connected in the manner shown in FIG6 , the voltage across the second resistor 20612 is sampled to generate a voltage sampling signal.

[0126] In some embodiments, FIG7 is a second schematic diagram of the structure of a voltage sampling circuit provided in an embodiment of the present disclosure. As shown in FIG7 , another connection method of the voltage sampling circuit 2061 can be: the first end of the first resistor 20611 is connected to the output end of the power module 205, the second end of the first resistor 20611 is respectively connected to the first end of the second resistor 20612 and the first end of the first capacitor 20614, the second end of the second resistor 20612 is respectively connected to the first end of the third resistor 20613 and the second end of the first capacitor 20614, the voltage sampling signal is output through the two ends of the first capacitor 20614, and the second end of the third resistor 20613 is grounded.

[0127] FIG7 shows another connection mode in which the voltage sampling circuit 2061 uses a voltage divider resistor for sampling. In this connection mode, a voltage sampling signal is generated by sampling the voltage across the second resistor 20612 .

[0128] In the embodiment of the present disclosure, the voltage sampling circuit 2061 can adopt any of the connection methods in Figures 6 or 7 above, or adopt other circuits for voltage detection. It can be understood that for the output end of the same circuit, when the voltage sampling circuit 2061 adopts different connection methods in Figures 6 or 7, the resistance values ​​of the first resistor 20611, the second resistor 20612, and the third resistor 20613 may be different due to the different sampling methods. In addition, for current output ends with different voltage values, when the voltage sampling circuit 2061 adopts one of the connection methods in Figures 6 or 7, the resistance values ​​of the first resistor 20611, the second resistor 20612, and the third resistor 20613 may also be different due to the different sampled voltages.

[0129] In another embodiment of the present disclosure, as shown in Figure 5, the detection circuit 206 may further include at least one current sampling circuit 2062, wherein: the at least one current sampling circuit 2062 is respectively connected to the output end of the power supply module 205, and is used to perform current sampling detection on the output signal of the power supply module 205 to obtain at least one current sampling signal; wherein the output signal of the power supply module 205 includes at least one of the following: a first power supply current output by the first voltage conversion circuit 202, a second power supply current output by the second voltage conversion circuit 203, and at least one third power supply current output by at least one voltage stabilization circuit 204.

[0130] In an embodiment of the present disclosure, FIG5 shows an example of a connection method of the current sampling circuit 2062. The current sampling circuit 2062 can also be respectively set at the output end of one or more circuits among the first voltage conversion circuit 202, the second voltage conversion circuit 203 and the at least one voltage stabilization circuit 204.

[0131] The current sampling circuit 2062 may be a circuit including a current sampling resistor, a circuit including a current sampling resistor and an operational amplifier, or other circuits capable of detecting current, which are not specifically limited herein.

[0132] In some embodiments, FIG8 is a schematic diagram of the composition structure of a current sampling circuit provided in an embodiment of the present disclosure. As shown in FIG8 , taking the power module 205 as a DCDC voltage conversion chip as an example, the above-mentioned current sampling circuit 2062 can be a current sampling resistor. The current sampling resistor is connected to the output terminal VOUT of the DCDC voltage conversion chip, and one end of the current sampling resistor is connected to the ISN port, and the other end of the current sampling resistor is connected to the ISP port. Here, sampling is performed through the current sampling resistor to generate a current sampling signal. In addition, as shown in FIG8 , VOUT' is the voltage signal obtained after the VOUT port of the DCDC voltage conversion chip passes through the current sampling resistor. Since the voltage drop across the current sampling resistor is small and can be ignored, the voltage at the VOUT port is approximately equal to the output voltage at VOUT'.

[0133] It can be understood that the resistance of the current sampling resistor 20621 may be different according to the different current values ​​of the first power supply current, the second power supply current and at least one third power supply current output by the circuit in the power module 205 connected to the current sampling circuit 2062.

[0134] In some embodiments, FIG9 is a second schematic diagram of the composition structure of a current sampling circuit provided in an embodiment of the present disclosure. As shown in FIG9 , taking the power module 205 as the first voltage conversion circuit or the second voltage conversion circuit as an example, the current sampling circuit 2062 can also be a current transformer. The current transformer is connected to the output terminal VOUT of the DCDC voltage conversion chip, and one end of the current transformer is connected to the ISN port, and the other end of the current transformer is connected to the ISP port. Sampling is performed here through the current transformer to generate a current sampling signal. In addition, as shown in FIG9 , VOUT' is the voltage signal obtained by the VOUT port of the DCDC voltage conversion chip through the current transformer. Since the voltage drop across the current transformer is small and can be ignored, the voltage at the VOUT port is approximately equal to the output voltage at VOUT'.

[0135] An embodiment of the present disclosure provides a power supply system, in which a detection circuit includes a current sampling circuit and a voltage sampling circuit, which detects output signals output by one or more circuits in a power supply module to prevent damage to a power-consuming module caused by abnormal output signals, thereby protecting the power-consuming module and improving the safety of the power supply system.

[0136] In another embodiment of the present disclosure, FIG10 is a fifth schematic diagram of the structure of a power supply system provided in an embodiment of the present disclosure. As shown in FIG10 , the first voltage conversion circuit 202 is further configured to receive a wake-up signal and, when the wake-up signal is at a low level, control the first voltage conversion circuit 202 to be in an off state to power off the power supply system 20; or, when the wake-up signal is at a high level, control the first voltage conversion circuit 202 to be in an on state to power on the power supply system 20.

[0137] The wake-up signal may be provided by a controller that controls the power supply system 20 , and the controller may be a microcontroller unit (MCU) in the BMS.

[0138] It can be understood that when the input wake-up signal is at a high level, the first voltage conversion circuit 202 is powered on and started, outputting the first supply voltage. The second voltage conversion circuit 203 and at least one voltage stabilizing circuit 204 connected to the first voltage conversion circuit 202 are also powered on and started, outputting the second supply voltage and at least one third supply voltage. When the input wake-up signal is at a low level, the first voltage conversion circuit 202 is powered off and stops outputting the first supply voltage. The second voltage conversion circuit 203 and at least one voltage stabilizing circuit 204 connected to the first voltage conversion circuit 202 are also powered off and stop outputting the second supply voltage and at least one third supply voltage. In addition, as in the aforementioned embodiment, the wake-up signal is input to the third voltage stabilizing circuit 2043 and the fourth voltage stabilizing circuit 2044. Therefore, the third voltage stabilizing circuit 2043 and the fourth voltage stabilizing circuit 2044 can provide the third supply voltage and the fourth supply voltage to the power-consuming module after the first voltage conversion circuit 202 is powered off.

[0139] An embodiment of the present disclosure provides a power supply system, which controls a first voltage conversion circuit through a wake-up signal, and further controls the power-on and power-off of the power supply system, so that the power supply system enters a lower power consumption state as much as possible when it does not need to work, thereby saving power consumption of the power supply system.

[0140] In another embodiment of the present disclosure, as shown in Figure 10, the power supply system 20 may further include an enable circuit 207, which is respectively connected to the enable end of the second voltage conversion circuit 203 and the enable end of at least one voltage stabilizing circuit 204, wherein: the enable circuit 207 is used to send a first enable signal to the second voltage conversion circuit 203, and control the power on or off of the second voltage conversion circuit 203 according to the first enable signal.

[0141] In the embodiment of the present disclosure, the first enable signal output by the enable circuit 207 may be a signal that enables or disables the enable terminal of the second voltage conversion circuit 203 to enable or disable the second voltage conversion circuit 203 to output the second supply voltage.

[0142] The enabling circuit 207 is further configured to send a respective second enabling signal to the at least one voltage stabilizing circuit 204 , and control power-up or power-down of the at least one voltage stabilizing circuit 204 according to the second enabling signal.

[0143] The first enable signal output by the enable circuit 207 may be a signal that enables or disables the enable terminal of at least one voltage stabilizing circuit 204 to output or not output the third supply voltage.

[0144] It can be understood that what is shown in Figure 10 is only one connection method of the enabling circuit 207. According to the circuit control requirements in the power supply system 20, the enabling module 207 can be connected to one or more of the second voltage conversion circuit 203 and at least one voltage stabilizing circuit 204, and send an enable signal to control the corresponding second voltage conversion circuit 203 or voltage stabilizing circuit 204 to power on or off.

[0145] An embodiment of the present disclosure provides a power supply system, including an enabling circuit, which controls the power-on or power-off of a second voltage conversion circuit and at least one voltage stabilizing circuit respectively through an enabling signal output by the enabling circuit, thereby reducing the power consumption of the power supply system and improving the flexibility of the power supply system.

[0146] In another embodiment of the present disclosure, the first voltage conversion circuit 202 and the second voltage conversion circuit 203 are buck-boost DC conversion circuits.

[0147] As in the aforementioned embodiment, the first voltage conversion circuit 202 and the second voltage conversion circuit 203 can both be buck-boost DC conversion circuits, which are used to boost or buck the DC input voltage input by the input power supply 201 and convert it into a DC first supply voltage, or boost or buck the DC first supply voltage and convert it into a DC second supply voltage.

[0148] An embodiment of the present disclosure provides a power supply system, in which the first voltage conversion circuit and the second voltage conversion circuit are configured as buck-boost DC conversion circuits to supply power to power-consuming modules requiring DC voltage, thereby meeting the power supply requirements of different power-consuming modules.

[0149] In another embodiment of the present disclosure, Figure 11 is a schematic diagram of the structure of a battery management system 30 provided in this embodiment. As shown in Figure 11, the battery management system 30 includes at least one functional circuit 301 and the power supply system 20 shown in the previous embodiment; the power supply system 20 is used to provide the power supply required by the at least one functional circuit 301.

[0150] The functional circuit 301 may be a power-consuming module in the above-mentioned BMS system, and may also be called a load. For example, it may be a communication module, a main chip, a CAN communication module or other circuits.

[0151] The functional circuit 301 may include one or more. Figure 11 shows an example of the connection between the functional circuit 301 and the power supply system 20 when the functional circuit 301 includes a first functional circuit 3011, a second functional circuit 3012, and a third functional circuit 3013. It can be understood that according to actual conditions, there can be multiple functional circuits 301, which are respectively connected to the power supply required by the power supply system 20 according to their respective voltage requirements.

[0152] An embodiment of the present disclosure provides a battery management system, in which a power supply system 20 provides power supply required by at least one functional circuit, thereby meeting the voltage requirements of different functional circuits.

[0153] The above description is merely a preferred embodiment of the present disclosure and is not intended to limit the scope of protection of the present disclosure. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

[0154] The embodiment of the present disclosure further provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the steps of the thermal control method provided in the above method embodiment.

[0155] It should be understood that the description of the above storage medium and device embodiments is similar to the description of the above method embodiments and has similar beneficial effects as the method embodiments. For technical details not disclosed in the storage medium, storage medium, and device embodiments of the present disclosure, please refer to the description of the method embodiments of the present disclosure for understanding.

[0156] It should be understood that "one embodiment" or "an embodiment" or "some embodiments" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present disclosure. Therefore, "in one embodiment" or "in an embodiment" or "in some embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in the various embodiments of the present disclosure, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present disclosure. The serial numbers of the embodiments of the present disclosure are for description only and do not represent the advantages and disadvantages of the embodiments. The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other. For the sake of brevity, they will not be repeated here.

[0157] It should also be noted that, in this disclosure, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0158] The serial numbers of the above-mentioned embodiments of the present disclosure are for description only and do not represent the advantages or disadvantages of the embodiments.

[0159] The methods disclosed in the several method embodiments provided in this disclosure can be arbitrarily combined without conflict to obtain new method embodiments.

[0160] The features disclosed in the several product embodiments provided in this disclosure can be arbitrarily combined without conflict to obtain new product embodiments.

[0161] The features disclosed in several method or device embodiments provided in this disclosure may be arbitrarily combined without conflict to obtain new method embodiments or device embodiments.

[0162] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

[0163] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims. Industrial Applicability

[0164] The present disclosure provides a power supply system and a battery management system, which convert the input voltage into a first power supply voltage, a second power supply voltage and at least one third power supply voltage respectively through different voltage conversion combinations between a first voltage conversion circuit, a second voltage conversion circuit and a voltage stabilization circuit. In this way, not only can a separate multi-stage power supply system be used to replace the function of an SBC, providing multiple power supply voltages and improving the stability and flexibility of the circuit, but it also saves the circuit design hardware cost and solves the problem of SBC supply risk.

Claims

1. A power supply system, the power supply system comprising: An input power supply, used for providing an input voltage; a first voltage conversion circuit, the first voltage conversion circuit being connected to the output end of the input power supply and being used for performing voltage conversion on the input voltage provided by the input power supply to generate a first supply voltage; a second voltage conversion circuit, the second voltage conversion circuit being connected to an output end of the first voltage conversion circuit and being used for performing voltage conversion on the first supply voltage to obtain a second supply voltage; At least one voltage stabilizing circuit, wherein the at least one voltage stabilizing circuit is respectively connected to at least one of the output end of the input power supply, the output end of the first voltage conversion circuit, and the output end of the second voltage conversion circuit, and is used to perform voltage conversion on at least one of the input voltage, the first supply voltage, and the second supply voltage to obtain at least one third supply voltage.

2. The power supply system according to claim 1, wherein: The at least one voltage stabilizing circuit comprises a first voltage stabilizing circuit, wherein: The first voltage stabilizing circuit is connected to the output end of the first voltage conversion circuit, and is used for performing voltage conversion on the first supply voltage to obtain the third supply voltage.

3. The power supply system according to claim 1 or 2, wherein: The at least one voltage stabilizing circuit comprises a second voltage stabilizing circuit, wherein: The second voltage stabilizing circuit is connected to the output end of the second voltage conversion circuit, and is used for performing voltage conversion on the second supply voltage to obtain the third supply voltage.

4. The power supply system according to claim 1, 2 or 3, wherein: The at least one voltage stabilizing circuit comprises a third voltage stabilizing circuit, wherein: The third voltage stabilizing circuit is connected to the output end of the input power supply and is used for performing voltage conversion on the input voltage to obtain the third power supply voltage.

5. The power supply system according to claim 4, wherein: The at least one voltage stabilizing circuit further comprises a fourth voltage stabilizing circuit, wherein: The fourth voltage stabilizing circuit is connected to the output end of the third voltage stabilizing circuit and is used for performing voltage conversion on the third power supply voltage output by the third voltage stabilizing circuit to obtain a fourth power supply voltage.

6. The power supply system according to any one of claims 1 to 5, wherein: The power supply system also includes a detection circuit, wherein: The detection circuit is connected to the output end of the power module in the power supply system, and is used to detect the output signal of the power module; wherein the power module includes at least one of the following: the first voltage conversion circuit, the second voltage conversion circuit and the at least one voltage stabilizing circuit.

7. The power supply system according to claim 6, wherein: The detection circuit includes at least one voltage sampling circuit, wherein: The at least one voltage sampling circuit is respectively connected to the output end of the power module, and is used to perform voltage sampling detection on the output signal of the power module to obtain at least one voltage sampling signal; The output signal of the power supply module includes at least one of the following: the first supply voltage, the second supply voltage and the at least one third supply voltage.

8. The power supply system according to claim 7, wherein: The voltage sampling circuit includes a first resistor, a second resistor, a third resistor and a first capacitor, wherein: The first end of the first resistor is connected to the output end of the power module, the second end of the first resistor is connected to the first end of the second resistor and the first end of the third resistor respectively, the second end of the second resistor is grounded, and the second end of the first capacitor is grounded; The second end of the third resistor is connected to the first end of the first capacitor for outputting the voltage sampling signal.

9. The power supply system according to claim 7, wherein: The voltage sampling circuit includes a first resistor, a second resistor, a third resistor and a first capacitor, wherein: The first end of the first resistor is connected to the output end of the power module, the second end of the first resistor is respectively connected to the first end of the second resistor and the first end of the first capacitor, the second end of the second resistor is respectively connected to the first end of the third resistor and the second end of the first capacitor, and the second end of the third resistor is grounded; The first end of the first capacitor and the second end of the first capacitor are used to output the voltage sampling signal.

10. The power supply system according to claim 6, wherein: The detection circuit includes at least one current sampling circuit, wherein: The at least one current sampling circuit is respectively connected to the output end of the power module, and is used to perform current sampling detection on the output signal of the power module to obtain at least one current sampling signal; The output signal of the power module includes at least one of the following: a first power supply current output by the first voltage conversion circuit, a second power supply current output by the second voltage conversion circuit, and at least one third power supply current output by the at least one voltage stabilizing circuit.

11. The power supply system according to claim 10, wherein: The current sampling circuit includes a current sampling resistor, wherein: The first end of the current sampling resistor is connected to the output end of the power module and the first current sampling end of the power module respectively, and the second end of the current sampling resistor is connected to the second current sampling end of the power module. The current sampling resistor is used to obtain the current sampling signal.

12. The power supply system according to claim 10, wherein: The current sampling circuit comprises a current transformer, wherein: The first end of the current transformer is connected to the first current sampling end of the power module, the second end of the current transformer is connected to the second current sampling end of the power module, and the third end of the current transformer is connected to the output end of the power module. The current transformer is used to obtain the current sampling signal.

13. The power supply system according to any one of claims 1 to 12, wherein: The first voltage conversion circuit is also used to receive a wake-up signal, and when the wake-up signal is at a low level, control the first voltage conversion circuit to be in a disconnected state so as to power off the power supply system; or, when the wake-up signal is at a high level, control the first voltage conversion circuit to be in a working state so as to power on the power supply system.

14. The power supply system according to any one of claims 1 to 13, wherein: The power supply system further includes an enabling circuit, which is respectively connected to an enabling terminal of the second voltage conversion circuit and an enabling terminal of the at least one voltage stabilizing circuit, wherein: The enabling circuit is used to send a first enabling signal to the second voltage conversion circuit, and control power-on or power-off of the second voltage conversion circuit according to the first enabling signal.

15. The power supply system according to claim 14, wherein: The enabling circuit is further used to send a respective second enabling signal to the at least one voltage stabilizing circuit, and to control the power-on or power-off of the at least one voltage stabilizing circuit according to the second enabling signal.

16. The power supply system according to any one of claims 1 to 15, wherein: The first voltage conversion circuit and the second voltage conversion circuit are buck-boost DC conversion circuits.

17. The power supply system according to any one of claims 1 to 16, wherein: The first power supply voltage, the second power supply voltage, the third power supply voltage and the fourth power supply voltage are different.

18. A battery management system, comprising at least one functional circuit and a power supply system according to any one of claims 1 to 17; in, The power supply system is used to provide the at least one functional circuit with the power supply required by each functional circuit.

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