Battery management system

Abstract

The utility model discloses a kind of battery management systems, battery management system includes power supply system, power supply system includes: input power supply, for providing input voltage;First voltage conversion circuit is used to carry out voltage transformation to input voltage provided by input power supply, generates first power supply voltage;Second voltage conversion circuit, for voltage transformation to first power supply voltage, obtains second power supply voltage;At least one voltage stabilizing circuit is used to carry out voltage transformation to at least one of input voltage, first power supply voltage and second power supply voltage, obtains at least one third power supply voltage;First voltage conversion circuit receives wake-up signal, which can reduce the power consumption of battery management system. In this way, not only can a separated multi-level power supply system be used to provide multiple power supply voltages, but also the hardware cost of the product is reduced, and the stability and design flexibility of the circuit are improved.

Description

[0001] Cross-references to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202323184282.9, filed on November 23, 2023, entitled "Power Supply System and Battery Management System", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This utility model relates to the field of power supply control, and in particular to a battery management system. Background Technology

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

[0005] In related technologies, SBCs perform a single voltage conversion on the input power supply voltage through different buck-boost conversion modules or voltage regulator modules, converting the input power supply voltage into multiple supply voltages. However, SBCs used in new energy vehicles are generally expensive, and due to market supply and demand, users may face disadvantages such as high supply risk and high costs. Utility Model Content

[0006] This utility model mainly provides a power supply system and a battery management system. Through multiple voltage conversion methods, it can not only replace the function of the SBC with a separate multi-stage power system and provide multiple power supply voltages, but also reduce the hardware cost of the product and improve the stability and design flexibility of the circuit.

[0007] The technical solution of this utility model is implemented as follows:

[0008] In a first aspect, embodiments of the present invention provide a battery management system, which includes a separate power supply system, the power supply system comprising:

[0009] Input power supply, used to provide input voltage;

[0010] The first voltage conversion circuit is connected to the output terminal of the input power supply and is used to convert the input voltage provided by the input power supply to generate the first supply voltage.

[0011] The second voltage conversion circuit is connected to the output terminal of the first voltage conversion circuit and is used to convert the first supply voltage to obtain the second supply voltage.

[0012] At least one voltage regulator circuit is connected to at least one of the output terminals of the input power supply, the output terminal of the first voltage conversion circuit, and the output terminal of the second voltage conversion circuit, respectively, for performing 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.

[0013] 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, the first voltage conversion circuit is in an off state; or when the wake-up signal is at a high level, the first voltage conversion circuit is in an operating state.

[0014] In some embodiments, at least one voltage regulator circuit includes a first voltage regulator circuit, wherein the first voltage regulator circuit is connected to the output terminal of a first voltage conversion circuit and is used to convert the first supply voltage to obtain a third supply voltage.

[0015] In some embodiments, at least one voltage regulator circuit includes a second voltage regulator circuit, wherein the second voltage regulator circuit is connected to the output terminal of the second voltage conversion circuit and is used to convert the second supply voltage to obtain a third supply voltage.

[0016] In some embodiments, at least one voltage regulator circuit includes a third voltage regulator circuit, wherein the third voltage regulator circuit is connected to the output terminal of the input power supply and is used to perform voltage transformation on the input voltage to obtain a third supply voltage.

[0017] In some embodiments, at least one voltage regulator circuit further includes a fourth voltage regulator circuit, wherein the fourth voltage regulator circuit is connected to the output terminal of the third voltage regulator circuit and is used to perform voltage transformation on the third supply voltage output by the third voltage regulator circuit to obtain a fourth supply voltage.

[0018] In some embodiments, the power supply system further includes a detection circuit, wherein: the detection circuit is connected to the output terminal 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 regulator circuit.

[0019] In some embodiments, the detection circuit includes at least one voltage sampling circuit, wherein: the at least one voltage sampling circuit is connected to the output terminal 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; wherein the output signal of the power module includes at least one of the following: a first supply voltage, a second supply voltage and at least one third supply voltage.

[0020] In some embodiments, 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 a voltage sampling signal.

[0021] In some embodiments, the detection circuit includes at least one current sampling circuit, wherein: the at least one current sampling circuit is connected to the output terminal 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; wherein the output signal of the power module includes at least one of the following: a first supply current output by a first voltage conversion circuit, a second supply current output by a second voltage conversion circuit, and at least one third supply current output by at least one voltage regulator circuit.

[0022] In some embodiments, the power supply system further includes an enabling circuit, which is connected to the enabling terminal of the second voltage conversion circuit and the enabling terminal of at least one voltage regulator circuit, respectively. The enabling circuit is configured to send a first enabling signal to the second voltage conversion circuit and control the power-on or power-off of the second voltage conversion circuit according to the first enabling signal. The enabling circuit is also configured to send a second enabling signal to each of the at least one voltage regulator circuit and control the power-on or power-off of the at least one voltage regulator circuit according to the second enabling signal.

[0023] In some embodiments, the first voltage conversion circuit and the second voltage conversion circuit are buck-boost DC-DC converter circuits.

[0024] In some embodiments, the battery management system further includes at least one functional circuit; wherein the power supply system is used to provide the power required by each of the at least one functional circuit.

[0025] Secondly, this utility model provides a power supply system, which is a separate power supply system comprising:

[0026] Input power supply, used to provide input voltage;

[0027] The first voltage conversion circuit is connected to the output terminal of the input power supply and is used to convert the input voltage provided by the input power supply to generate the first supply voltage.

[0028] The second voltage conversion circuit is connected to the output terminal of the first voltage conversion circuit and is used to convert the first supply voltage to obtain the second supply voltage.

[0029] At least one voltage regulator circuit is connected to at least one of the output terminals of the input power supply, the output terminal of the first voltage conversion circuit, and the output terminal of the second voltage conversion circuit, respectively, for performing 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.

[0030] Through the above-mentioned technical means, the input voltage is converted by the first voltage conversion circuit, and then converted by the second voltage conversion circuit and at least one voltage regulator circuit to provide a first supply voltage, a second supply voltage, and at least one third supply voltage to power modules with different voltage requirements. This not only increases the range and number of supply voltage specifications to meet the power voltage requirements of different modules, but also improves the accuracy and stability of voltage regulation.

[0031] In some embodiments, at least one voltage regulator circuit includes a first voltage regulator circuit, wherein:

[0032] The first voltage regulator circuit is connected to the output of the first voltage conversion circuit and is used to convert the first supply voltage to obtain the third supply voltage.

[0033] By using the above-mentioned technical means, the first power supply voltage is transformed by the first voltage regulator circuit to provide a third power supply voltage to the power-consuming modules, thereby meeting the voltage requirements of different power-consuming modules and improving the flexibility of the power supply system.

[0034] In some embodiments, at least one voltage regulator circuit includes a second voltage regulator circuit, wherein:

[0035] The second voltage regulator circuit is connected to the output of the second voltage conversion circuit and is used to convert the second supply voltage to obtain the third supply voltage.

[0036] By using the above-mentioned technical means, the second power supply voltage is transformed through the second voltage regulator circuit to provide a third power supply voltage to the power-consuming modules, thereby meeting the voltage requirements of different power-consuming modules and improving the flexibility of the power supply system.

[0037] In some embodiments, at least one voltage regulator circuit includes a third voltage regulator circuit, wherein:

[0038] The third voltage regulator circuit is connected to the output terminal of the input power supply and is used to transform the input voltage to obtain the third supply voltage.

[0039] By using the above-mentioned technical means, the input voltage is transformed through a third voltage regulator circuit to provide a third power supply voltage to the power-consuming modules, thereby meeting the voltage requirements of different power-consuming modules and improving the flexibility of the power supply system.

[0040] In some embodiments, at least one voltage regulator circuit further includes a fourth voltage regulator circuit, wherein:

[0041] The fourth voltage regulator circuit is connected to the output of the third voltage regulator circuit and is used to transform the third power supply voltage output by the third voltage regulator circuit to obtain the fourth power supply voltage.

[0042] By using the above-mentioned technical means, the third power supply voltage is transformed by the fourth voltage regulator circuit to provide a fourth power supply voltage to the power-consuming modules, thereby meeting the voltage requirements of different power-consuming modules and improving the flexibility of the power supply system.

[0043] In some embodiments, the power supply system further includes a detection circuit, wherein:

[0044] The detection circuit is connected to the output terminal 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 regulator circuit.

[0045] Through the above technical means, the detection circuit detects one or more circuits in the power module, avoids abnormal output signals, protects the power module, and improves the safety of the power supply system.

[0046] In some embodiments, the detection circuit includes at least one voltage sampling circuit, wherein:

[0047] At least one voltage sampling circuit is connected to the output terminal of the power module to perform voltage sampling and detection on the output signal of the power module to obtain at least one voltage sampling signal.

[0048] The output signal of the power 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.

[0049] By using the above-mentioned technical means, the voltage sampling circuit performs voltage sampling and detection on the output signal of one or more circuits in the power supply module, avoiding damage to the power module caused by excessively high or low voltage of the output signal, and improving the safety of the power supply system.

[0050] In some embodiments, the voltage sampling circuit includes a first resistor, a second resistor, a third resistor, and a first capacitor, wherein:

[0051] 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.

[0052] The second end of the third resistor is connected to the first end of the first capacitor, and is used to output the voltage sampling signal.

[0053] By employing the aforementioned technical means and using a voltage divider resistor method for voltage sampling, damage to the power module can be avoided by excessively high or low voltage output signals, thus improving the safety of the power supply system.

[0054] In some embodiments, the detection circuit includes at least one current sampling circuit, wherein:

[0055] At least one current sampling circuit is connected to the output terminal of the power module to perform current sampling detection on the output signal of the power module and obtain at least one current sampling signal.

[0056] The output signal of the power module includes at least one of the following: a first supply current output by a first voltage conversion circuit, a second supply current output by a second voltage conversion circuit, and at least one third supply current output by at least one voltage regulator circuit.

[0057] By using the above-mentioned technical means, current sampling and detection are performed on the output signals of one or more circuits in the power supply module to avoid damage to the power module caused by excessively high or low current values ​​of the output signals, thereby improving the safety of the power supply system.

[0058] In some embodiments, the first voltage conversion circuit is further configured to receive a wake-up signal, and control the first voltage conversion circuit to be in a disconnected state when the wake-up signal is at a low level; or, control the first voltage conversion circuit to be in a working state when the wake-up signal is at a high level.

[0059] By using the above-mentioned technical means, the first voltage conversion circuit is controlled by the wake-up signal, so that the power supply system can enter a low power consumption state as much as possible when it is not needed, thereby saving the power consumption of the power supply system.

[0060] In some embodiments, the power supply system further includes an enable circuit, which is connected to the enable terminal of the second voltage conversion circuit and the enable terminal of at least one voltage regulator circuit, wherein:

[0061] An enabling circuit is used to send a first enabling signal to the second voltage conversion circuit and control the power-on or power-off of the second voltage conversion circuit according to the first enabling signal.

[0062] The enabling circuit is also used to send a second enabling signal to at least one voltage regulator circuit, and control the power-on or power-off of at least one voltage regulator circuit according to the second enabling signal.

[0063] By employing the aforementioned technical means, the enable signal output by the enable circuit controls the power-on or power-off of the second voltage conversion circuit and at least one voltage regulator circuit, thereby reducing the power consumption of the power supply system and improving its flexibility.

[0064] In some embodiments, the first voltage conversion circuit and the second voltage conversion circuit are buck-boost DC-DC converter circuits.

[0065] By using the above-mentioned technical means, the first voltage conversion circuit and the second voltage conversion circuit are set as buck-boost DC-DC converter circuits to supply power to power modules that require DC voltage, thereby meeting the power supply needs of different power modules.

[0066] Thirdly, this utility model embodiment provides a battery management system, which includes at least one functional circuit and a power supply system as described in the first aspect.

[0067] The power supply system is used to provide the power required by at least one functional circuit.

[0068] Through the above-mentioned technical means, the power supply system provides power 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.

[0069] This utility model provides a power supply system and a battery management system. By using different voltage conversion combinations among a first voltage conversion circuit, a second voltage conversion circuit, and a voltage regulator circuit, the input voltage is converted into a first supply voltage, a second supply voltage, and at least one third supply voltage. In this way, not only can a discrete multi-stage power supply system replace the function of the SBC, providing multiple supply voltages and improving the stability and flexibility of the circuit, but it also saves on circuit design hardware costs and solves the problem of SBC supply risk. Attached Figure Description

[0070] Figure 1 This is a schematic diagram of the structure of an SBC chip.

[0071] Figure 2 A schematic diagram of the composition structure of a power supply system provided in this embodiment of the utility model. Figure 1 ;

[0072] Figure 3 A schematic diagram of the composition structure of a power supply system provided in this embodiment of the utility model. Figure 2 ;

[0073] Figure 4 A schematic diagram of the composition structure of a power supply system provided in this embodiment of the utility model. Figure 3 ;

[0074] Figure 5 A schematic diagram of the composition structure of a power supply system provided in this embodiment of the utility model. Figure 4 ;

[0075] Figure 6 A schematic diagram of the composition structure of a voltage sampling circuit provided in an embodiment of this utility model. Figure 1 ;

[0076] Figure 7 A schematic diagram of the composition structure of a voltage sampling circuit provided in an embodiment of this utility model. Figure 2 ;

[0077] Figure 8 A schematic diagram of the composition structure of a current sampling circuit provided in this embodiment of the present invention. Figure 1 ;

[0078] Figure 9 A schematic diagram of the composition structure of a current sampling circuit provided in this embodiment of the present invention. Figure 2 ;

[0079] Figure 10 A schematic diagram of the composition structure of a power supply system provided in this embodiment of the utility model. Figure 5 ;

[0080] Figure 11 This is a schematic diagram of the composition structure of a battery management system provided in an embodiment of the present invention. Detailed Implementation

[0081] To gain a more detailed understanding of the features and technical content of the embodiments of this utility model, the implementation of the embodiments of this utility model will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of this utility model.

[0082] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing embodiments of the invention only and is not intended to limit the invention.

[0083] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is 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.

[0084] It should also be noted that the terms "first, second, third" used in the embodiments of this utility model are only used to distinguish similar objects and do not represent a specific order of objects. It is understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this utility model described herein can be implemented in an order other than that illustrated or described herein.

[0085] In a Battery Management System (BMS), multiple power supplies with different voltages are required to power various modules. In related technologies, this function is implemented by an SBC chip, which is an integrated chip that includes functions such as wake-up, diagnostics, reset, and power output. SBC chips typically provide multiple external interfaces for outputting different voltages to different modules.

[0086] Figure 1 This is a schematic diagram of the structure of an SBC chip. Figure 1 As shown, the SBC chip 101 may include multiple modules for voltage conversion. Among them, the buck-boost module 1014, also known as a Buck / Boost module, is used to step down the input power supply voltage to power other modules in the BMS. For example, the input power supply may be a battery with a voltage range of 11~15V, and the voltage output by the buck-boost module 1014 may be 7V or 5V. The first voltage regulator module 1015, also known as an LDO_uC module, is used to regulate and step down the input power supply voltage to power the main chip in the BMS. The second voltage regulator module 1016, also known as an LDO_Com module, is used to regulate and step down the input power supply voltage to power the communication module in the BMS. The third voltage regulator module 1018, also known as an LDO_Ref module, is used to regulate and step down the input power supply voltage to power the amplifier module. It is understood that the output voltage of the first voltage regulator module 1015, the second voltage regulator module 1016, and the third voltage regulator module 1018 can be set according to the voltage requirements of the functional circuit, also referred to below as the power module. For example, it can be 5V or 7V.

[0087] In related technologies, the SBC chip 101 may also include a wake-up input module 1011, also known as a Wake Input module, for receiving external wake-up signals to start the SBC chip.

[0088] The SBC chip 101 may also include a diagnostic module 1012, also known as a Diagnosis module, used to determine if the SBC chip's operating status is abnormal.

[0089] SBC chip 101 may also include a reset module 1013, also known as a Watchdog / Reset module, used to restart or reset the SBC chip when an abnormality occurs in its operation.

[0090] SBC chip 101 may also include a tracking module 1017, also known as a Tracker module, for networking communication with other modules in the BMS.

[0091] Although the aforementioned SBC chip can be used in a BMS to power multiple power modules with different voltage requirements, the SBCs used in new energy vehicles are generally expensive. Furthermore, due to market supply and demand constraints, users may face high supply risks and high costs. Therefore, the design of a discrete multi-stage power supply system is particularly important.

[0092] Based on the above-mentioned technical problems, this utility model provides a battery management system that can convert the input voltage into a first supply voltage, a second supply voltage, and at least a third supply voltage through different voltage conversion combinations between a first voltage conversion circuit, a second voltage conversion circuit, and at least one voltage regulator 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 supply voltages, but it also reduces the hardware cost of the product and improves the stability and design flexibility of the circuit.

[0093] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0094] Figure 2 A schematic diagram of the composition structure of a power supply system provided in this embodiment of the utility model. Figure 1 .like Figure 2 As shown, the power supply system 20 may include:

[0095] Input power supply 201 is used to provide input voltage;

[0096] The 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 the first supply voltage.

[0097] The second voltage conversion circuit 203 is connected to the output terminal of the first voltage conversion circuit 202 and is used to convert the first power supply voltage to obtain the second power supply voltage.

[0098] At least one voltage regulator circuit 204 is connected to at least one of the output terminals of the input power supply 201, the output terminal of the first voltage conversion circuit 202, and the output terminal of the second voltage conversion circuit 203, respectively, for performing 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.

[0099] In this embodiment of the invention, the input power supply 201 can be a storage battery with a voltage range of 11V to 15V. The positive terminal of the storage battery, namely the KL30 terminal, can be connected to the input terminal of the first voltage conversion circuit 202 to provide an input voltage with a voltage range of 11V to 15V to the first voltage conversion circuit 202.

[0100] It is understandable that the voltage range of the battery that serves as the input power source 201 can also be other values, depending on the voltage requirements of the power-consuming modules in the BMS.

[0101] In this embodiment of the present invention, the first voltage conversion circuit 202 can convert the input voltage provided by the input power supply 201 to generate the first supply voltage.

[0102] The first voltage conversion circuit 202 can be a buck-boost converter, capable of stepping down or boosting the input voltage and outputting a stable voltage that is less than or greater than the input voltage as the first supply voltage. It can be 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 for stepping down the input voltage; or a boost converter, used only for boosting the input voltage.

[0103] In this embodiment of the invention, the input power supply 201 is a DC power supply. If the power-consuming module in the BMS also uses DC voltage, the first voltage conversion circuit 202 can be a DC-DC buck-boost converter. It can be understood that, depending on the voltage type of the input power supply 201 and the power-consuming module, the first voltage conversion circuit 202 can also be a DC-AC buck-boost converter, an AC-DC buck-boost converter, or an AC-AC buck-boost converter.

[0104] For example, when the input power supply 201 is a battery, the input voltage range provided to the first voltage conversion circuit 202 through the KL30 terminal can be 11V~15V. After the voltage is converted by the first voltage conversion circuit 202, the output first supply voltage can be 7.0V.

[0105] In this embodiment of the invention, the second voltage conversion circuit 203 can convert the first power supply voltage to obtain the second power supply voltage.

[0106] In this embodiment of the present invention, the second voltage conversion circuit 203 may be a buck-boost converter of the same type as the first voltage conversion circuit 202, or it may be a buck-boost converter of a different type than the first voltage conversion circuit 202, depending on the voltage conversion requirements.

[0107] After the first voltage conversion circuit 202 performs one conversion on the input voltage, the output first supply voltage may still not meet the voltage requirements of some power-consuming modules due to limitations in the voltage conversion amplitude. In this case, the first supply voltage can be converted again by the second voltage conversion circuit 203 to boost or buck the first supply voltage again and output the second supply voltage.

[0108] For example, if the first supply voltage output by the first voltage conversion circuit 202 is 7.0V, after being converted again by the second voltage conversion circuit 203, the output second supply voltage can be 3.3V.

[0109] In this embodiment of the present invention, at least one voltage regulator circuit 204 can be used to perform voltage transformation 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.

[0110] The voltage regulator circuit 204 can be a low dropout regulator (LDO), which is a DC or AC voltage regulator that can step down and regulate the input voltage.

[0111] like Figure 2 As shown, the voltage regulator circuit 204 can include multiple types, each connected to the output terminal of a different circuit, such as the first voltage regulator circuit 2041, the second voltage regulator circuit 2042, and the third voltage regulator circuit 2043. Each voltage regulator circuit 204 can further include multiple circuits that output different supply voltages. Below, we will use an example where each of the first voltage regulator circuit 2041, the second voltage regulator circuit 2042, and the third voltage regulator circuit 2043 is represented to illustrate the connection method of each voltage regulator circuit 204.

[0112] In this embodiment of the invention, a first voltage regulator circuit 2041 can be connected to the output terminal of the first voltage conversion circuit 202 to perform voltage conversion on the first supply voltage to obtain at least one third supply voltage. It is understood that the third supply voltage output by different voltage regulator circuits 204 can be different. For example, if the first supply voltage is 7.0V, after being stepped down and regulated by the voltage regulator circuit 204, the output third supply voltage can be 5.0V.

[0113] In this embodiment of the invention, a second voltage regulator circuit 2042 can 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 voltage output by different voltage regulator circuits 204 can be different. For example, if the second supply voltage is 3.3V, after being stepped down and regulated by the voltage regulator circuit 204, the output third supply voltage can be 1.2V.

[0114] In this embodiment of the invention, a third voltage regulator circuit 2043 can be provided and connected to the output terminal of the input power supply 201 to perform voltage transformation on the input voltage to obtain at least one third supply voltage. It is understood that different voltage regulator circuits 204 can output different third supply voltages. For example, when the input power supply 201 is a battery, its voltage range is 11V~15V. After being stepped down and regulated by the voltage regulator circuit 204, the output third supply voltage can be 5.0V.

[0115] It should be noted that the multiple third voltage regulator circuits 2043 in the voltage regulator circuit 204 can be connected to the output terminal of the input power supply 201, the multiple first voltage regulator circuits 2041 in the voltage regulator circuit 204 can be connected to the output terminal of the first voltage conversion circuit 202, and the multiple second voltage regulator circuits 2042 in the voltage regulator circuit 204 can be connected to the output terminal of the second voltage conversion circuit 203. The connection method and quantity are determined according to the needs of the power module, and will not be listed one by one in this embodiment of the present invention.

[0116] It is understood that the power module can be connected to one of the following according to voltage requirements: the output terminal of the input power supply 201, the output terminal of the first voltage conversion circuit 202, the output terminal of the second voltage conversion circuit 203, and the output terminal of the voltage regulator circuit 204, and can be connected to the input voltage, or the first power supply voltage, or the second power supply voltage, or the third power supply voltage provided by any of the above output terminals.

[0117] This utility model provides a power supply system that converts the input voltage through a first voltage conversion circuit, and then through a second voltage conversion circuit and at least one voltage regulator 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 power supply voltages to meet the power voltage requirements of different modules, but also improves the accuracy and stability of voltage regulation.

[0118] In another embodiment of this utility model, Figure 3 A schematic diagram of the composition structure of a power supply system provided in this embodiment of the utility model. Figure 2 .like Figure 3As shown, the at least one voltage regulator circuit 204 may include a first voltage regulator circuit 2041, wherein the first voltage regulator circuit 2041 is connected to the output terminal of the first voltage conversion circuit 202 and is used to convert the first supply voltage to obtain a third supply voltage.

[0119] As in the aforementioned embodiments, there can be multiple first voltage regulator circuits 2041, and the voltage values ​​of the output third supply voltage can be the same or different. For example, as... Figure 3 As shown, the first voltage regulator circuit 20411 can be called the LDO_uC module, which is used to output a third power supply voltage of 5.0V to the main chip; the first voltage regulator circuit 20412 can be called the LDO_communication module, which is used to output a third power supply voltage of 5.0V to the communication module; and the first voltage regulator circuit 20413 can be called the LDO_Analog module, which is used to output a third power supply voltage of 5.0V to the analog module.

[0120] It is understandable that, in order to achieve independent control over the power-on and power-off of each power-consuming module, the voltage values ​​of the third power supply voltage output by the first voltage regulator circuits 20411, 20412, and 20413 can be the same, and are respectively input to multiple power-consuming modules with the same voltage requirement. Alternatively, the voltage values ​​of the third power supply voltage output by the above circuits can be different, and are respectively 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 regulator circuit 2041.

[0121] In some embodiments, continue reading Figure 3 The aforementioned at least one voltage regulator circuit 204 may include a second voltage regulator circuit 2042, wherein the second voltage regulator circuit 2042 is connected to the output terminal of the second voltage conversion circuit 203 and is used to convert the second supply voltage to obtain a third supply voltage.

[0122] Multiple second voltage regulator circuits 2042 can be configured, such as... Figure 3 As shown, this embodiment of the present invention takes the second voltage regulator circuit 2042 as an example. After the input voltage provided by the input power supply 201 undergoes two voltage transformations through the first voltage conversion circuit 202 and the second voltage conversion circuit 203, the output second power supply voltage may still not meet the voltage requirements of some power-consuming modules due to voltage drop limitations. The second voltage regulator circuit 2042 can transform the second power supply voltage again to output a third power supply voltage to the power-consuming equipment.

[0123] For example, the second voltage regulator circuit 2042 may be an LDO_Core module for outputting a third supply voltage of 1.2V to the core power module.

[0124] In some embodiments, such as Figure 3 As shown, the at least one voltage regulator circuit package 204 includes a third voltage regulator circuit 2043, wherein the third voltage regulator circuit 2043 is connected to the output terminal of the input power supply 201 and is used to perform voltage conversion on the input voltage to obtain a third supply voltage.

[0125] Multiple third voltage regulator circuits 2043 can be configured, such as... Figure 3 As shown, this embodiment of the present invention takes the third voltage regulator circuit 2043 as an example. The third voltage regulator 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 module, the third voltage regulator circuit 2043 can directly convert the input voltage within the voltage drop range of the input voltage and output the third supply voltage.

[0126] For example, the third voltage regulator circuit 2043 may be an LDO_CAN module, used to output a third supply voltage of 5.0V to the Controller Area Network (CNA) communication module.

[0127] In addition, the third voltage regulator 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 regulator circuit 204 are powered off, the third voltage regulator circuit 2043 can output a third power supply voltage to the power consumption module to meet the load power supply requirements of the power supply system 20 during sleep.

[0128] In some embodiments, such as Figure 3 As shown, the at least one voltage regulator circuit 204 further includes a fourth voltage regulator circuit 2044, wherein the fourth voltage regulator circuit 2044 is connected to the output terminal of the third voltage regulator circuit 2043 and is used to perform voltage conversion on the third power supply voltage output by the third voltage regulator circuit 2043 to obtain a fourth power supply voltage.

[0129] Multiple fourth voltage regulator circuits 2044 can be configured, such as... Figure 3 As shown, this embodiment of the present invention takes the fourth voltage regulator circuit 2044 as an example. The fourth voltage regulator circuit 2044 can be connected to the output terminal of the third voltage regulator circuit 2043 to further step down the third power supply voltage and output a fourth power supply voltage to the electrical equipment.

[0130] For example, the fourth voltage regulator circuit 2044 may be an LDO_RTC module for providing a fourth supply voltage of 3.3V to the real time clock (RTC).

[0131] It should be noted that, Figure 3The number and output voltage range of the first voltage regulator circuit 2041, the second voltage regulator circuit 2042, the third voltage regulator circuit 2043, and the fourth voltage regulator circuit 2044 shown are only examples. The actual number and output voltage range can be determined according to the specific situation of the power module. Exemplarily, the output terminal of the above-mentioned voltage regulator circuit can also be connected to at least one voltage regulator circuit, which will not be listed here.

[0132] This utility model provides a power supply system including a first voltage regulator circuit, a second voltage regulator circuit, a third voltage regulator circuit, and a fourth voltage regulator circuit. The input voltage is transformed by the voltage of the multi-branch voltage regulator circuit to output multiple third power supply voltages, thereby meeting the voltage requirements of different power-consuming modules and improving the flexibility of the power supply system.

[0133] In another embodiment of this utility model, Figure 4 A schematic diagram of the composition structure of a power supply system provided in this embodiment of the utility model. Figure 3 .like Figure 4 As shown, the power supply system 20 also 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 used 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 regulator circuit 204.

[0134] The power supply system 20 may also be equipped with a detection circuit 206, also known as a Diagnosis module. By setting a detection point at the output terminal of any of the circuits in the first voltage conversion circuit 202, the second voltage conversion circuit 203, and at least one voltage regulator circuit 204, the current, voltage, temperature, or other output signals output by any of the above circuits are sampled, so that the detection circuit 206 can accurately determine the output current value, voltage value, and other information, and avoid abnormal output of the power supply system 20.

[0135] The detection circuit 206 can be a multimeter that can detect 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. These are not listed here.

[0136] It is understood that the detection circuit 206 can comprehensively detect the signals output by one, more, or all of the following circuits: the first voltage conversion circuit 202, the second voltage conversion circuit 203, and at least one voltage regulator circuit 204. Figure 4 The following explanation uses the detection circuit 206 to detect all the above circuits as an example. The actual connection is determined according to the specific detection requirements.

[0137] In some embodiments, Figure 5 A schematic diagram of the composition structure of a power supply system provided in this embodiment of the utility model. Figure 4 .like Figure 5 As shown, the detection circuit 206 includes at least one voltage sampling circuit 2061, wherein: the at least one voltage sampling circuit 2061 is connected to the output terminal of the power module 205 respectively, and is used 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.

[0138] Understandable. Figure 5 The diagram shows only one connection method between the voltage sampling circuit 2061 and the power module 205. The number of voltage sampling circuits 2061 can be set according to actual functional safety requirements. Alternatively, based on the voltage values ​​of the first, second, and third supply voltages in the output signal, a voltage sampling circuit 2061 can be set at the output terminal of each circuit in the power module 205 to perform voltage sampling detection on the output signal of each circuit and output at least one voltage sampling signal.

[0139] The voltage sampling circuit 2061 can be a voltage divider resistor sampling circuit, a battery sampling chip (analog front end, AFE) in a BMS that can acquire voltage signals, or other circuits that can acquire voltage signals.

[0140] In some embodiments, Figure 6 A schematic diagram of the composition structure of a voltage sampling circuit provided in an embodiment of this utility model. Figure 1 See also Figure 6 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 terminal of the first resistor 20611 is connected to the output terminal of the power module 205. The second terminal of the first resistor 20611 is connected to the first terminals of the second resistor 20612 and the third resistor 20613, respectively. The second terminal of the second resistor 20612 is grounded, and the second terminal of the first capacitor 20614 is grounded. The second terminal of the third resistor 20613 is connected to the first terminal of the first capacitor 20614 and is used to output a voltage sampling signal.

[0141] The voltage sampling circuit 2061 can use a voltage divider resistor for sampling. When the voltage sampling circuit 2061 is... Figure 6 When the connection method is as described above, a voltage sampling signal is generated by sampling the voltage across the second resistor 20612.

[0142] In some embodiments, Figure 7 A schematic diagram of the composition structure of a voltage sampling circuit provided in an embodiment of this utility model. Figure 2 .like Figure 7 As shown, another connection method for 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 connected to the first end of the second resistor 20612 and the first end of the first capacitor 20614 respectively, the second end of the second resistor 20612 is connected to the first end of the third resistor 20613 and the second end of the first capacitor 20614 respectively, 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.

[0143] Figure 7 The diagram shows another connection method for the voltage sampling circuit 2061 when sampling using a voltage divider resistor. In this connection method, a voltage sampling signal is generated by sampling the voltage across the second resistor 20612.

[0144] In this embodiment of the invention, the voltage sampling circuit 2061 may employ the above-described... Figure 6 or Figure 7 The voltage can be detected using any of the connection methods described above, or by employing other circuits. It is understood that for the output of the same circuit, the voltage sampling circuit 2061 can use... Figure 6 or Figure 7 With different connection methods, the resistance values ​​of the first resistor 20611, the second resistor 20612, and the third resistor 20613 may differ due to the different sampling methods. Furthermore, for current output terminals with different voltage values, the voltage sampling circuit 2061 uses... Figure 6 or Figure 7 In one of the connection methods, the resistance values ​​of the first resistor 20611, the second resistor 20612, and the third resistor 20613 may also be different due to different sampling voltages.

[0145] In another embodiment of this utility model, such as Figure 5 As shown, the detection circuit 206 may further include at least one current sampling circuit 2062, wherein: the at least one current sampling circuit 2062 is connected to the output terminal of the power module 205 respectively, and is used to perform current sampling detection on the output signal of the power module 205 to obtain at least one current sampling signal; wherein, the output signal of the power module 205 includes at least one of the following: a first supply current output by the first voltage conversion circuit 202, a second supply current output by the second voltage conversion circuit 203, and at least one third supply current output by at least one voltage regulator circuit 204.

[0146] In this embodiment of the utility model, Figure 5The diagram shows an example of a connection method in the current sampling circuit 2062. The current sampling circuit 2062 can also be set at the output terminal of one or more of the first voltage conversion circuit 202, the second voltage conversion circuit 203, and at least one voltage regulator circuit 204.

[0147] The current sampling circuit 2062 can be a circuit that includes a current sampling resistor, a circuit that includes a current sampling resistor and an operational amplifier, or other circuits that can detect current; no specific limitation is made here.

[0148] In some embodiments, Figure 8 A schematic diagram of the composition structure of a current sampling circuit provided in this embodiment of the present invention. Figure 1 .like Figure 8 As shown, taking the power module 205 as an example of a DC-DC voltage conversion chip, the aforementioned current sampling circuit 2062 can be a current sampling resistor. The current sampling resistor is connected to the output terminal VOUT of the DC-DC voltage conversion chip, with one end connected to the ISN port and the other end connected to the ISP port. Here, sampling is performed through the current sampling resistor to generate a current sampling signal. Additionally, as... Figure 8 As shown, VOUT' is the voltage signal obtained after passing through the current sampling resistor at the VOUT port of the DC-DC voltage conversion chip. Since the voltage drop across the current sampling resistor is small and negligible, the voltage at the VOUT port is approximately equal to the output voltage at VOUT'.

[0149] It is understandable that the resistance value of the current sampling resistor 20621 can be different depending on the different current values ​​output by the first power supply current, the second power supply current, and at least one third power supply current in the power supply module 205 connected to the current sampling circuit 2062.

[0150] In some embodiments, Figure 9 A schematic diagram of the composition structure of a current sampling circuit provided in this embodiment of the present invention. Figure 2 .like Figure 9 As shown, taking the power module 205 as an example of the first or second voltage conversion circuit, the current sampling circuit 2062 can also be a current transformer. The current transformer is connected to the output terminal VOUT of the DC-DC voltage conversion chip, with one end connected to the ISN port and the other end connected to the ISP port. Here, sampling is performed through the current transformer to generate a current sampling signal. Additionally, as... Figure 9As shown, VOUT' is the voltage signal obtained from the VOUT port of the DC-DC voltage converter chip through the current transformer. Since the voltage drop across the current transformer is small and negligible, the voltage at the VOUT port is approximately equal to the output voltage at VOUT'.

[0151] This utility model provides a power supply system. The detection circuit includes a current sampling circuit and a voltage sampling circuit, which detects the output signals of one or more circuits in the power module, preventing abnormal output signals from damaging the power module, protecting the power module, and improving the safety of the power supply system.

[0152] In another embodiment of this utility model, Figure 10 A schematic diagram of the composition structure of a power supply system provided in this embodiment of the utility model. Figure 5 .like Figure 10 As shown, the first voltage conversion circuit 202 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 202 to be in a disconnected state so as to power down 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 a working state so as to power up the power supply system 20.

[0153] The wake-up signal can be provided by the controller of the power supply system 20, which can be a microcontroller unit (MCU) in the BMS.

[0154] It can be understood that when the input wake-up signal is high, the first voltage conversion circuit 202 is powered on and starts, outputting a first supply voltage. The second voltage conversion circuit 203 and at least one voltage regulator circuit 204 connected to the first voltage conversion circuit 202 are also powered on and start, outputting a second supply voltage and at least one third supply voltage. When the input wake-up signal is low, the first voltage conversion circuit 202 is powered off, stopping the output of the first supply voltage. The second voltage conversion circuit 203 and at least one voltage regulator circuit 204 connected to the first voltage conversion circuit 202 are also powered off, stopping the output of the second supply voltage and at least one third supply voltage. Furthermore, as in the aforementioned embodiment, the wake-up signal is input to the third voltage regulator circuit 2043 and the fourth voltage regulator circuit 2044. Therefore, the third voltage regulator circuit 2043 and the fourth voltage regulator circuit 2044 can provide the third and fourth supply voltages to the power-consuming module after the first voltage conversion circuit 202 is powered off.

[0155] This utility model provides a power supply system that controls the first voltage conversion circuit by a wake-up signal, thereby controlling the power-on and power-off states of the power supply system. This allows the power supply system to enter a low-power state when it is not in use, thus saving power consumption.

[0156] In another embodiment of this utility model, such as Figure 10 As shown, the power supply system 20 may further include an enable circuit 207, which is connected to the enable terminal of the second voltage conversion circuit 203 and the enable terminal of at least one voltage regulator circuit 204, respectively. 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 power-off of the second voltage conversion circuit 203 according to the first enable signal.

[0157] In this embodiment of the present invention, the first enable signal output by the enable circuit 207 can be a signal that enables or disables the enable terminal of the second voltage conversion circuit 203, thereby causing the second voltage conversion circuit 203 to output or not output the second supply voltage.

[0158] The enabling circuit 207 is also used to send a second enabling signal to each of the at least one voltage regulator circuit 204, and control the power-on or power-off of the at least one voltage regulator circuit 204 according to the second enabling signal.

[0159] The first enable signal output by the enable circuit 207 can be a signal that enables or disables the enable terminal of at least one voltage regulator circuit 204, causing the voltage regulator circuit 204 to output or not output a third supply voltage.

[0160] Understandable. Figure 10 The diagram shows only one connection method for the enable circuit 207. Depending on the circuit control requirements in the power supply system 20, the enable module 207 can be connected to one or more of the second voltage conversion circuit 203 and at least one voltage regulator circuit 204, respectively, and send enable signals to control the corresponding second voltage conversion circuit 203 or voltage regulator circuit 204 to be powered on or off.

[0161] This utility model provides a power supply system including an enable circuit. The enable signal output by the enable circuit controls the power-on or power-off of a second voltage conversion circuit and at least one voltage regulator circuit, thereby reducing the power consumption of the power supply system and improving the flexibility of the power supply system.

[0162] In another embodiment of this utility model, the first voltage conversion circuit 202 and the second voltage conversion circuit 203 are buck-boost DC-DC converter circuits.

[0163] As in the aforementioned embodiments, both the first voltage conversion circuit 202 and the second voltage conversion circuit 203 can be buck-boost DC-DC converter circuits, used to boost or buck the DC input voltage input from the input power supply 201 and convert it into a first DC supply voltage, or boost or buck the first DC supply voltage and convert it into a second DC supply voltage.

[0164] This utility model embodiment provides a power supply system in which the first voltage conversion circuit and the second voltage conversion circuit are configured as buck-boost DC-DC converter circuits to supply power to power modules that require DC voltage, thereby meeting the power supply needs of different power modules.

[0165] In another embodiment of this utility model, Figure 11 This is a schematic diagram illustrating the structural composition of a battery management system 30 provided in an embodiment of the present invention. Figure 11 As shown, the battery management system 30 includes at least one functional circuit 301 and a power supply system 20 as shown in the foregoing embodiment; wherein the power supply system 20 is used to provide the power supply required by each of the at least one functional circuit 301.

[0166] The functional circuit 301 can be a power module in the BMS system described above, or a load. For example, it can be a communication module, a main chip, a CAN communication module, or other circuits.

[0167] Functional circuit 301 may include one or more, Figure 11 The diagram shows an example of the connection between the functional circuit 301, which includes the first functional circuit 3011, the second functional circuit 3012, and the third functional circuit 3013, and the power supply system 20. It can be understood that, depending on the actual situation, there may be multiple functional circuits 301, which are connected to the power supply system 20 according to their respective voltage requirements.

[0168] This utility model embodiment provides a battery management system in which a power supply system 20 provides power to at least one functional circuit according to its own needs, thereby meeting the voltage requirements of different functional circuits.

[0169] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.

[0170] This utility model embodiment also provides a computer program product containing instructions that, when run on a computer, causes the computer to execute the steps in the thermal control method provided in the above method embodiment.

[0171] It should be understood that the descriptions of the above storage medium and device embodiments are similar to the descriptions of the above method embodiments, and have similar beneficial effects. For technical details not disclosed in the embodiments of the storage medium, storage medium, and device of this utility model, please refer to the descriptions of the method embodiments of this utility model for understanding.

[0172] It should be understood that the phrases "one embodiment," "an embodiment," or "some embodiments" throughout the specification mean that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment," "in one embodiment," or "in some embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of the present invention, the sequence numbers of the above-described processes do not imply a sequential 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 invention. The sequence numbers of the above-described embodiments are merely for descriptive purposes and do not represent the superiority or inferiority of the embodiments. The descriptions of the various embodiments above tend to emphasize the differences between the various embodiments; their similarities or commonalities can be referred to mutually, and for the sake of brevity, they will not be repeated here.

[0173] It should also be noted that, in this invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0174] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0175] The methods disclosed in the several method embodiments provided by this utility model can be arbitrarily combined without conflict to obtain new method embodiments.

[0176] The features disclosed in the several product embodiments provided by this utility model can be arbitrarily combined without conflict to obtain new product embodiments.

[0177] The features disclosed in the several method or device embodiments provided by this utility model can be arbitrarily combined without conflict to obtain new method or device embodiments.

[0178] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

[0179] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A battery management system, characterized in that, The battery management system includes a separate power supply system, which includes: Input power supply, used to provide input voltage; A first voltage conversion circuit is connected to the output terminal of the input power supply and is used to convert the input voltage provided by the input power supply to generate a first supply voltage. A second voltage conversion circuit is connected to the output terminal of the first voltage conversion circuit, and is used to convert the first power supply voltage to obtain a second power supply voltage. At least one voltage regulator circuit is connected to at least one of the output terminals of the input power supply, the output terminal of the first voltage conversion circuit, and the output terminal of the second voltage conversion circuit, respectively, for performing 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; The first voltage conversion circuit is further configured to receive a wake-up signal, and when the wake-up signal is at a low level, the first voltage conversion circuit is in an off state; or, when the wake-up signal is at a high level, the first voltage conversion circuit is in an operating state.

2. The battery management system according to claim 1, characterized in that, The at least one voltage regulator circuit includes a first voltage regulator circuit, wherein: The first voltage regulator circuit is connected to the output terminal of the first voltage conversion circuit and is used to convert the first supply voltage to obtain the third supply voltage.

3. The battery management system according to claim 1, characterized in that, The at least one voltage regulator circuit includes a second voltage regulator circuit, wherein: The second voltage regulator circuit is connected to the output terminal of the second voltage conversion circuit and is used to convert the second power supply voltage to obtain the third power supply voltage.

4. The battery management system according to claim 1, characterized in that, The at least one voltage regulator circuit includes a third voltage regulator circuit, wherein: The third voltage regulator circuit is connected to the output terminal of the input power supply and is used to perform voltage transformation on the input voltage to obtain the third power supply voltage.

5. The battery management system according to claim 4, characterized in that, The at least one voltage regulator circuit further includes a fourth voltage regulator circuit, wherein: The fourth voltage regulator circuit is connected to the output terminal of the third voltage regulator circuit and is used to transform the third power supply voltage output by the third voltage regulator circuit to obtain the fourth power supply voltage.

6. The battery management system according to claim 1, characterized in that, The power supply system also includes a detection circuit, wherein: The detection circuit is connected to the output terminal 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 regulator circuit.

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

8. The battery management system according to claim 7, characterized in that, 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, 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 to output the voltage sampling signal.

9. The battery management system according to claim 6, characterized in that, The detection circuit includes at least one current sampling circuit, wherein: The at least one current sampling circuit is connected to the output terminal 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 supply current output by the first voltage conversion circuit, a second supply current output by the second voltage conversion circuit, and at least one third supply current output by the at least one voltage regulator circuit.

10. The battery management system according to claim 1, characterized in that, The power supply system further includes an enable circuit, which is connected to the enable terminal of the second voltage conversion circuit and the enable terminal of the at least one voltage regulator circuit, respectively, wherein: The enabling circuit is used to send a first enabling signal to the second voltage conversion circuit, and control the power-on or power-off of the second voltage conversion circuit according to the first enabling signal. The enabling circuit is further configured to send a second enabling signal to each of the at least one voltage regulator circuit, and control the power-on or power-off of the at least one voltage regulator circuit according to the second enabling signal.

11. The battery management system according to any one of claims 1 to 10, characterized in that, The first voltage conversion circuit and the second voltage conversion circuit are buck-boost DC-DC converter circuits.

12. The battery management system according to any one of claims 1 to 10, characterized in that, The battery management system also includes at least one functional circuit; The power supply system is used to provide the power required by each of the at least one functional circuit.

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