Isolated power supply and battery management system

Abstract

This application discloses an isolated power supply and a battery management system. The isolated power supply is applied to the battery management system and includes a drive module and a transformer. The input terminal of the drive module is connected to a first voltage source output by the battery management system. One end of the transformer is electrically connected to the output terminal of the drive module, and the other end of the transformer is electrically connected to the power supply terminal of the high-voltage device. This enables the battery management system to provide isolated power to the high-voltage device, ensuring the normal operation of the high-voltage device on the high-voltage side.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an isolated power supply and battery management system. Background Technology

[0002] With the rapid development of new energy vehicles, the functional requirements for battery management systems (BMS) are becoming increasingly stringent, leading to a growing demand for BMS to control the high-voltage side. However, with these increased functionalities, the specifications for automotive-grade high-voltage power supplies are also becoming more stringent. Therefore, ensuring the normal operation of high-voltage devices on the high-voltage side using a BMS is a pressing technical problem that needs to be solved. Utility Model Content

[0003] This application provides an isolated power supply and battery management system, which enables the use of a battery management system to provide isolated power to high-voltage devices, ensuring the normal operation of high-voltage devices on the high-voltage side.

[0004] In a first aspect, this application provides an isolated power supply applied to a battery management system, the isolated power supply comprising:

[0005] The driver module has its input terminal connected to the first voltage source output by the battery management system.

[0006] The transformer has one end electrically connected to the output terminal of the drive module and the other end electrically connected to the power supply terminal of the high-voltage device.

[0007] Furthermore, the isolated power supply provided in this application also includes a voltage regulator module;

[0008] One end of the voltage regulator module is electrically connected to the other end of the transformer, and the other end of the voltage regulator module is electrically connected to the power supply terminal of the high-voltage device.

[0009] Furthermore, the isolated power supply provided in this application also includes a rectifier module;

[0010] One end of the rectifier module is electrically connected to the other end of the transformer, and the other end of the rectifier module is electrically connected to the other end of the voltage regulator module.

[0011] Furthermore, in the isolated power supply provided in this application, the voltage regulator module includes a voltage-adjustable voltage regulator module.

[0012] Furthermore, in the isolated power supply provided in this application, the adjustable voltage regulator module includes:

[0013] A voltage regulator has its input terminal electrically connected to the other end of a transformer, and its output terminal electrically connected to the power supply terminal of a high-voltage device.

[0014] An adjustable resistor is provided, with one end electrically connected to the voltage regulation terminal of the voltage regulator and the other end grounded.

[0015] Furthermore, in the isolated power supply provided in this application, the drive module includes a push-pull drive module.

[0016] Furthermore, in the isolated power supply provided in this application, the voltage of the second voltage source connected to the power supply terminal of the high-voltage device is greater than the voltage of the first voltage source.

[0017] Furthermore, in the isolated power supply provided in this application, the high-voltage device includes a smart fuse.

[0018] Secondly, this application also provides a battery management system that includes at least one isolated power source provided in the first aspect.

[0019] Furthermore, in the battery management system provided in this application, the battery management system also includes a system base chip, which outputs a first voltage source, and multiple isolated power supplies are connected to the first voltage source.

[0020] The isolated power supply provided in this application is applied to a battery management system. The isolated power supply includes a drive module and a transformer. The input terminal of the drive module is connected to the first voltage source output by the battery management system. One end of the transformer is electrically connected to the output terminal of the drive module, and the other end of the transformer is electrically connected to the power supply terminal of the high-voltage device. This enables the battery management system to provide isolated power to the high-voltage device, ensuring the normal operation of the high-voltage device on the high-voltage side. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic block diagram of a battery management system provided in an embodiment of this application;

[0023] Figure 2 The circuit diagram is provided for the voltage adjustable regulator module in the embodiments of this application.

[0024] Figure label:

[0025] 10. Battery Management System; 100. Isolated Power Supply; 110. Drive Module; 120. Transformer; 130. Voltage Regulator Module; 140. Rectifier Module; 200. System Base Chip; 20. High Voltage Components. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0028] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0029] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0030] Furthermore, in this application, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific implementation.

[0031] Please see Figure 1 , Figure 1 This is a schematic block diagram of the battery management system 10 provided in an embodiment of this application.

[0032] like Figure 1 As shown, this application provides an isolated power supply 100, which is applied to a battery management system 10. The isolated power supply 100 includes:

[0033] The input terminal of the drive module 110 is connected to the first voltage source output by the battery management system 10.

[0034] Transformer 120, one end of which is electrically connected to the output terminal of drive module 110, and the other end of which is electrically connected to the power supply terminal of high voltage device 20.

[0035] Specifically, this application can achieve electrical isolation through transformer 120, and isolate the first voltage source output by the battery management system 10 from the power supply terminal of the high-voltage device 20, preventing the high voltage of the high-voltage device 20 from affecting the battery management system 10 in reverse, thus ensuring system safety. Simultaneously, the drive module 110 can process the input first voltage source and, through the transformation ratio of transformer 120, convert the voltage into a voltage value suitable for supplying the high-voltage device 20, meeting the power supply requirements of different high-voltage devices 20.

[0036] In this application, the drive module 110 can receive the first voltage source output by the battery management system 10, amplify and shape it, and generate a drive signal suitable for driving the primary winding of the transformer 120. The drive signal has a pulse signal with a certain frequency and duty cycle, which is used to control the on and off of the primary winding of the transformer 120, thereby realizing the transfer of energy.

[0037] Meanwhile, transformer 120 is the core component of isolation power supply 100. The primary winding of transformer 120 is connected to drive module 110, and the secondary winding of transformer 120 is connected to the power supply terminal of high-voltage device 20. When the pulse signal output by drive module 110 passes through the primary winding, it generates an alternating magnetic field in the core of transformer 120. The alternating magnetic field induces a corresponding voltage in the secondary winding, thereby converting the input voltage into the required output voltage and achieving electrical isolation.

[0038] In addition, the voltage induced by the secondary winding of the transformer 120, after rectification and filtering, can provide a stable power supply for the high-voltage device 20. The power supply is electrically isolated from the voltage source output by the battery management system 10, thereby ensuring the safety and reliability between the high-voltage device 20 and the battery management system 10.

[0039] In this embodiment, the high-voltage device 20 can be understood as a device responsible for controlling high voltage in the energy storage system where the battery management system 10 is located. It can be understood as a device on the battery side, such as a fuse in the battery pack or a fuse, relay and circuit breaker in the high-voltage box on the battery pack side.

[0040] The isolation power supply 100 provided in this application is applied to the battery management system 10. The isolation power supply 100 includes a drive module 110 and a transformer 120. The input terminal of the drive module 110 is connected to the first voltage source output by the battery management system 10. One end of the transformer 120 is electrically connected to the output terminal of the drive module 110, and the other end of the transformer 120 is electrically connected to the power supply terminal of the high-voltage device 20. Thus, the battery management system 10 can be used to provide isolated power to the high-voltage device 20, ensuring the normal operation of the high-voltage device 20 on the high-voltage side.

[0041] In some embodiments, such as Figure 1 As shown, the isolation power supply 100 also includes a voltage regulator module 130; wherein, one end of the voltage regulator module 130 is electrically connected to the other end of the transformer 120, and the other end of the voltage regulator module 130 is electrically connected to the power supply terminal of the high-voltage device 20.

[0042] In this application, by setting a voltage stabilizing module 130 between the transformer 120 and the high-voltage device 20, the performance and reliability of the isolated power supply 100 can be further improved.

[0043] Specifically, the output voltage of transformer 120 may be affected by factors such as input voltage fluctuations and load changes. This application uses a voltage regulator module 130 to regulate the output voltage of transformer 120, ensuring that the voltage output to high-voltage device 20 is always kept within a stable range.

[0044] For example, when the first voltage source output by the battery management system 10 fluctuates, the voltage regulator module 130 can automatically adjust to keep the power supply voltage of the high-voltage device 20 stable, thereby ensuring the normal operation of the high-voltage device 20.

[0045] Meanwhile, the voltage regulator module 130 can prevent damage to the high-voltage device 20 due to excessively high or low output voltage from the transformer 120. By setting an appropriate voltage regulation range, this application can effectively suppress abnormal voltage fluctuations and provide reliable power supply protection for the high-voltage device 20.

[0046] In addition, the voltage regulator module 130 can reduce ripple and noise in the output voltage of the transformer 120 and improve the output quality of the power supply. This is especially important for the high-voltage device 20, which has high requirements for power quality, thereby improving the overall performance and stability of the system.

[0047] In some embodiments, such as Figure 1 As shown, the isolation power supply 100 also includes a rectifier module 140; wherein, one end of the rectifier module 140 is electrically connected to the other end of the transformer 120, and the other end of the rectifier module 140 is electrically connected to the other end of the voltage regulator module 130.

[0048] In this application, the secondary winding of transformer 120 can output AC voltage. To convert the AC voltage output from the secondary winding of transformer 120 into DC voltage for powering high-voltage device 20, this application can provide a rectifier module 140 between transformer 120 and high-voltage device 20, thereby ensuring that high-voltage device 20 receives a stable and reliable DC power supply. The rectifier module 140 can perform full-bridge rectification.

[0049] Specifically, the core of the rectifier module 140 is the rectifier circuit, which commonly includes half-wave rectification, full-wave rectification, and bridge rectification. This application can perform full-bridge rectification using the rectifier module 140, specifically utilizing the entire cycle of the AC voltage for rectification, thereby achieving a higher output voltage and higher efficiency. The transformer 120 can be a center-tapped transformer 120.

[0050] Meanwhile, the rectified voltage typically contains high ripple, so this application can smooth it by setting up a filter circuit. The filter circuit can be capacitor filtering, inductor filtering, or π-type filtering, etc. Capacitor filtering reduces ripple in the output voltage through the charging and discharging of the capacitor, and is suitable for applications with low load current. Inductor filtering reduces ripple in the output voltage through the energy storage of the inductor, and is suitable for applications with high load current. π-type filtering combines the filtering effects of capacitors and inductors, and can more effectively reduce ripple in the output voltage, making it suitable for applications with high power quality requirements.

[0051] In addition, to further stabilize the output voltage, a voltage regulator circuit can be set between the rectifier module 140 and the high-voltage device 20, which can adjust the rectified DC voltage and ensure that the output voltage is always kept within a stable range.

[0052] In some embodiments, the voltage regulator module 130 includes a voltage-adjustable voltage regulator module.

[0053] Specifically, this application sets an adjustable voltage regulator module at the power supply terminal of the high-voltage device 20, thereby dynamically adjusting the output voltage according to different application scenarios and the needs of the high-voltage device 20, so that the isolation power supply 100 can adapt to a variety of different load requirements and improve the versatility and flexibility of the isolation power supply 100.

[0054] In addition, the voltage adjustable regulator module mentioned in this application can further optimize the quality of the isolated power supply 100, reduce ripple and noise in the output voltage, and thus improve the stability and reliability of the isolated power supply 100.

[0055] In some embodiments, such as Figure 2As shown, the voltage adjustable regulator module includes: a voltage regulator U1, the input terminal of which is electrically connected to the other end of the transformer 120, and the output terminal of which is electrically connected to the power supply terminal of the high-voltage device 20; and an adjustable resistor R1, one end of which is electrically connected to the voltage adjustment terminal of the voltage regulator U1, and the other end of which is grounded.

[0056] In this application, voltage regulator U1 is the core component of the adjustable voltage regulator module. Voltage regulator U1 typically contains sampling, feedback, and regulation circuits, capable of automatically adjusting the output voltage to ensure its stability. The input terminal of voltage regulator U1 is connected to the secondary winding of transformer 120, and the output terminal is connected to the power supply terminal of high-voltage device 20. Voltage regulator U1 can receive the input voltage from the secondary winding of transformer 120 and stabilize it within a set output voltage range. The voltage regulator U1 can be an LM317.

[0057] One end of the adjustable resistor R1 is connected to the voltage adjustment terminal of the voltage regulator U1, and the other end is grounded. This application allows the output voltage of the voltage regulator U1 to be changed by adjusting the resistance value of the adjustable resistor R1. By changing its resistance, the adjustable resistor R1 affects the voltage at the voltage adjustment terminal of the voltage regulator U1, thereby changing the output voltage of the voltage regulator U1. Specifically, the adjustable resistor R1 and the internal feedback circuit of the voltage regulator U1 form a voltage divider network. By adjusting the resistance value of the adjustable resistor R1, the feedback voltage can be changed, and thus the output voltage can be adjusted.

[0058] For example, if the high-voltage device 20 includes a first smart fuse and a second smart fuse, the first smart fuse is supplied with a power supply voltage of 24V and the second smart fuse is supplied with a power supply voltage of 12V. The voltage adjustable regulator module supplies power to the first smart fuse. If the voltage adjustable regulator module is required to supply power to the second smart fuse, the adjustable resistor R1 needs to be adjusted so that the voltage adjustable regulator module outputs 12V voltage. This can enable the power supply to various high-voltage devices 20, thereby greatly reducing the customization cost of the isolation power supply 100.

[0059] Specifically, while the input terminal Vin of voltage regulator U1 is electrically connected to the secondary winding of transformer 120, the input terminal Vin of voltage regulator U1 can be grounded to GND through capacitor C1. The input terminal Vin of voltage regulator U1 is also electrically connected to the negative terminal of diode D1. The positive terminal of diode D1 is electrically connected to the output terminal Vout of voltage regulator U1. The output terminal Vout of voltage regulator U1 is electrically connected to the power supply terminal of high-voltage device 20. At the same time, the output terminal Vout of voltage regulator U1 is electrically connected to one end of resistor R2, the negative terminal of diode D2, and one end of capacitor C3. The other end of resistor R2 is electrically connected to the voltage adjustment terminal of voltage regulator U1, one end of adjustable resistor R1, one end of capacitor C2, and the positive terminal of diode D2. The other ends of capacitor C2 and capacitor C3 are grounded to GND.

[0060] In some embodiments, the drive module 110 includes a push-pull drive module.

[0061] In this application, the drive module 110 can be a push-pull drive module, which can effectively improve drive efficiency, reduce energy loss, and provide a larger drive current. Additionally, it can reduce the magnetic bias of the transformer 120, thereby improving the service life and performance of the transformer 120. The push-pull drive module can be of model SN6507.

[0062] Specifically, the push-pull drive module includes two switching transistors, such as MOSFETs or BJTs, which can alternately turn on and off, forming complementary drive signals. Simultaneously, the sources or emitters of the two switching transistors are electrically connected, forming a common terminal, which can be understood as the push-pull point. This push-pull point can be connected to a first voltage source through the primary winding of transformer 120, and the two ends of the primary winding of transformer 120 are respectively connected to the drains or collectors of the two switching transistors. Furthermore, the push-pull drive module requires control signals to drive the two switching transistors. These control signals can be two complementary pulse signals, controlling the on and off states of the two switching transistors respectively. This application can adjust the current in the primary winding of transformer 120 by controlling the frequency and duty cycle of the control signals, thereby controlling the energy transfer of transformer 120.

[0063] In some embodiments, the voltage of the second voltage source connected to the power supply terminal of the high-voltage device 20 is greater than the voltage of the first voltage source.

[0064] In this application, the isolation power supply 100 has a boost function, which can convert the first voltage source into a second voltage source while maintaining electrical isolation, ensuring that the high voltage of the high-voltage device 20 does not reversely affect the battery management system 10. Simultaneously, the output voltage of the isolation power supply 100 is stable and has overvoltage protection, overcurrent protection, and other functions, thereby ensuring the safe and reliable operation of the system. The first voltage source can be 5.8V, and the second voltage source can be 24V.

[0065] In some embodiments, the high-voltage device 20 includes a smart fuse.

[0066] In this application, the smart fuse can be understood as a Pyro fuse. The smart fuse can be installed in the high-voltage box or battery pack, and can automatically disconnect the circuit when an abnormal current or voltage is detected when a short circuit occurs in the energy storage system, so as to protect the devices in the energy storage system from damage.

[0067] Specifically, this application, through the combined design of a push-pull drive module, a transformer 120, a rectifier module 140, and a voltage-adjustable regulator module, can achieve the conversion from a lower first voltage source to a higher second voltage source, while providing stable power supply and communication support for the smart fuse. It is suitable for various application scenarios that require high voltage power supply and circuit protection, such as electric vehicles and energy storage systems, and can effectively improve the performance and reliability of the system.

[0068] It should be noted that the isolated power supply 100 mentioned in this application may also be equipped with a digital isolation chip, CAN isolation, etc., which can be selected according to the actual application, and this application does not make specific limitations.

[0069] In some embodiments, such as Figure 1 As shown, this application also provides a battery management system 10, which includes at least one isolated power supply 100 provided in this application.

[0070] Specifically, the Battery Management System (BMS) is a critical system for managing the battery pack. It monitors battery parameters such as voltage, current, and temperature in real time, ensuring consistent voltage or charge levels across all battery cells to extend battery life. It also prevents overcharging, over-discharging, overcurrent, and overheating, ensuring battery safety. Furthermore, the BMS can communicate with vehicle control systems or other devices to transmit battery status information in real time.

[0071] In this application, the battery management system 10 is equipped with an isolation power supply 100. The isolation power supply 100 can be applied to the 400V battery management system 10. It can not only electrically isolate the battery management system 10 from the high voltage device 20 to prevent the high voltage of the high voltage device 20 from affecting the battery management system 10 in reverse, but also convert the lower voltage output by the battery management system 10 into the higher voltage required by the high voltage device 20. At the same time, it can also ensure that the high voltage device 20 obtains a stable power supply voltage, even under the condition of input voltage fluctuation or load change.

[0072] In some embodiments, such as Figure 1As shown, the battery management system 10 also includes a system base chip 200, which outputs a first voltage source, and multiple isolated power supplies 100 are connected to the first voltage source.

[0073] Specifically, in the battery management system 10, the system base chip 200 (SBC) provides basic power management functions, including voltage regulation, current monitoring, and temperature monitoring. The system base chip 200 can also integrate functions such as an LDO (Low Dropout Voltage Regulator), watchdog timer, and fault diagnosis.

[0074] In addition, the first voltage source output by the system base chip 200 can be used as the input of multiple isolated power supplies 100 to provide independent power to different high-voltage devices 20, thereby improving the modularity and reliability of the system and simplifying power management.

[0075] In this application, multiple isolated power supplies 100 can be connected in parallel, such as three isolated power supplies 100 connected in parallel, thereby enabling programmable output voltage. Each isolated power supply 100 module is responsible for converting the first voltage source output by the system base chip 200 into a second voltage source suitable for a specific high-voltage device 20. At the same time, each isolated power supply 100 module can work independently, thereby ensuring that each high-voltage device 20 receives a stable power supply, and also providing electrical isolation and protection functions for each high-voltage device 20.

[0076] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An isolated power supply (100) characterized by, Applied to a battery management system (10), the isolated power supply (100) includes: A drive module (110) is connected to the first voltage source output by the battery management system (10) at its input terminal. A transformer (120) is provided, one end of which is electrically connected to the output terminal of the drive module (110), and the other end of which is electrically connected to the power supply terminal of the high-voltage device (20).

2. The isolated power supply (100) of claim 1, characterized in that, The isolation power supply (100) also includes a voltage regulator module (130); One end of the voltage regulator module (130) is electrically connected to the other end of the transformer (120), and the other end of the voltage regulator module (130) is electrically connected to the power supply terminal of the high-voltage device (20).

3. The isolated power supply (100) of claim 2, characterized in that, The isolation power supply (100) also includes a rectifier module (140); One end of the rectifier module (140) is electrically connected to the other end of the transformer (120), and the other end of the rectifier module (140) is electrically connected to the other end of the voltage regulator module (130).

4. The isolated power supply (100) of claim 2, characterized in that, The voltage regulator module (130) includes an adjustable voltage regulator module.

5. The isolated power supply (100) of claim 4, characterized in that, The adjustable voltage regulator module includes: A voltage regulator (U1) is provided, with its input terminal electrically connected to the other end of the transformer (120) and its output terminal electrically connected to the power supply terminal of the high-voltage device (20). An adjustable resistor (R1) is provided, one end of which is electrically connected to the voltage adjustment terminal of the voltage regulator (U1), and the other end of which is grounded.

6. An isolated power supply (100) according to any one of claims 1-5, characterized in that, The drive module (110) includes a push-pull drive module.

7. An isolated power supply (100) according to any one of claims 1-5, characterized in that, The voltage of the second voltage source connected to the power supply terminal of the high-voltage device (20) is greater than the voltage of the first voltage source.

8. The isolated power supply (100) according to any one of claims 1-5, characterized by, The high-voltage device (20) includes a smart fuse.

9. A battery management system (10), characterized by, Includes at least one isolated power supply (100) according to any one of claims 1-8.

10. The battery management system (10) according to claim 9, characterized in that, The battery management system (10) also includes a system base chip (200), which outputs the first voltage source, and multiple isolated power supplies (100) are connected to the first voltage source.

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