A BMS low-power control circuit

Abstract

The utility model provides a kind of innovative BMS low-power control circuit, including buck circuit, switching device, working circuit and CAN communication circuit;The voltage input end of buck circuit is connected voltage source, and the voltage output end of buck circuit is connected the first connecting end of switching device;The second connecting end of switching device is connected the power supply input end of working circuit;The first power supply input end of CAN communication circuit is connected the voltage input end of buck circuit, and the second power supply input end of CAN communication circuit is connected the second connecting end of switching device;The third connecting end of switching device is connected the switch control output end of CAN communication circuit;CAN communication circuit is also connected with working circuit communication;Working circuit connects battery sampling module, and battery sampling module connects battery module.BMS is reduced in standby state Energy consumption, reduce the power consumption of battery pack.

Description

Technical Field

[0001] This utility model relates to the field of product structure of BMS battery management technology, and in particular to a low-power control circuit for BMS. Background Technology

[0002] In recent years, with increasing global attention to environmental protection, the electrification trend in the shipping industry has become increasingly apparent. Especially against the backdrop of increasingly stringent environmental regulations, such as the sulfur caps and carbon emission requirements implemented by the International Maritime Organization (IMO), these regulations have prompted the shipping industry to actively seek cleaner and more efficient alternative energy sources. In this environment, the demand for pure electric and hybrid-powered ships has risen significantly. Lithium-ion batteries, as the current mainstream energy storage solution, have been widely used in this field due to their high energy density and relatively mature technology.

[0003] However, for ocean-going vessels, long-duration continuous voyages are the norm, which means they require a highly reliable and durable Battery Management System (BMS). An effective BMS can not only monitor battery status, such as voltage and temperature, but also predict battery health, and arrange reasonable maintenance plans by analyzing changes in internal resistance and capacity degradation trends, thereby preventing failures and reducing unnecessary downtime. Furthermore, real-time data sharing capabilities can coordinate the operation of the entire power system, ensuring efficient resource utilization.

[0004] Due to the unique operating environment of ocean-going vessels, the battery energy they carry is extremely precious. Each charging cycle directly affects the vessel's range, therefore, how to efficiently manage every unit of electricity becomes a critical issue.

[0005] Therefore, reducing the energy consumption of the BMS in standby mode is particularly important for large ships equipped with battery packs in the megawatt-hour (MWh) range. Utility Model Content

[0006] To address the aforementioned challenges, this invention proposes a low-power control circuit design for a BMS, aiming to reduce the energy consumption of the BMS in standby mode and decrease the power consumption of the battery module.

[0007] A low-power control circuit for a BMS includes a step-down circuit, switching devices, a working circuit, and a CAN communication circuit.

[0008] The voltage input terminal of the step-down circuit is connected to the power input terminal, and the voltage output terminal of the step-down circuit is connected to the first connection terminal of the switching device.

[0009] The second connection terminal of the switching device is connected to the power supply input terminal of the working circuit;

[0010] The first power supply input terminal of the CAN communication circuit is connected to the voltage input terminal of the step-down circuit, and the second power supply input terminal of the CAN communication circuit is connected to the second connection terminal of the switching device.

[0011] The switch control output terminal of the CAN communication circuit is connected to the third connection terminal of the switching device;

[0012] The CAN communication circuit is also connected to the working circuit.

[0013] The working circuit is connected to the battery sampling module, and the battery sampling module is connected to the battery module.

[0014] Furthermore, the low-power control circuit also includes a filter circuit, which is connected between the voltage input terminal of the buck circuit and the voltage source.

[0015] Furthermore, the step-down circuit uses a DC-DC converter chip.

[0016] Furthermore, the CAN communication circuit uses a CAN communication chip.

[0017] Furthermore, the battery sampling circuit includes a temperature sampling circuit.

[0018] Furthermore, the battery sampling circuit includes a voltage sampling circuit.

[0019] Furthermore, the low-power control circuit also includes a crystal oscillator circuit;

[0020] The crystal oscillator circuit and the working circuit are connected.

[0021] Furthermore, the low-power control circuit also includes input / output circuits;

[0022] The input / output circuits and the working circuit are connected.

[0023] Furthermore, the step-down circuit is used to convert the 24V voltage into a 5V DC voltage.

[0024] Furthermore, the working circuit is a microcontroller.

[0025] The beneficial technical effects of this utility model are as follows: When working, the CAN communication circuit conduction device switch is activated, and the step-down circuit reduces the voltage to supply power to the CAN communication circuit, working circuit, etc. When not working, the switching device is deactivated, and the CAN communication circuit receives power and enters sleep mode, thus reducing energy consumption. Attached Figure Description

[0026] Figure 1 This utility model provides a schematic diagram of a low-power BMS control circuit.

[0027] Figure 2 This utility model provides a schematic diagram of a filter circuit for a low-power control circuit of a BMS.

[0028] Figure 3 A schematic diagram of a step-down circuit for a BMS low-power control circuit is provided for this utility model.

[0029] Figure 4 This utility model provides a schematic diagram of the CAN communication circuit of a BMS low-power control circuit. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0033] See Figure 1 This utility model provides a low-power control circuit for a BMS, including a step-down circuit 1, a switching device 2, a working circuit 4, and a CAN communication circuit 3.

[0034] The voltage input terminal of the step-down circuit 1 is connected to the power input terminal, and the voltage output terminal of the step-down circuit 1 is connected to the first connection terminal of the switching device 2.

[0035] The second connection terminal of the switching device 2 is connected to the power supply input terminal of the working circuit 4;

[0036] The first power supply input terminal of the CAN communication circuit 3 is connected to the voltage input terminal of the step-down circuit 1, and the second power supply input terminal of the CAN communication circuit 3 is connected to the second connection terminal of the switching device 2.

[0037] The switch control output terminal of CAN communication circuit 3 is connected to the third connection terminal of switch device 2;

[0038] CAN communication circuit 3 is also connected to the working circuit 4.

[0039] Working circuit 4 is connected to battery sampling module 5, and battery sampling module 5 is connected to battery module.

[0040] CAN communication circuit 3 includes a CAN chip that can switch between normal operation and sleep modes, and outputs high and low level drive signals. The CAN (Controller Area Network) communication circuit communicates with the host computer.

[0041] When in operation, the CAN communication circuit turns on the switch, and the step-down circuit steps down the voltage to supply power to the CAN communication circuit, the working circuit, etc. When not in operation, the switch turns off, and the CAN communication circuit receives power and enters sleep mode, thus reducing energy consumption.

[0042] Furthermore, the low-power control circuit also includes a filter circuit 8, which is connected between the voltage input terminal of the step-down circuit 1 and the voltage source.

[0043] See Figure 2 The specific circuit structure of the filter circuit is shown below. The power input filter circuit 8 consists of a power inductor L1, an electrolytic capacitor, a ceramic capacitor, and a common-mode inductor L2. The power inductor L1, electrolytic capacitor C1, and ceramic capacitor C2 form a π-type filter and energy storage structure to suppress differential-mode noise at the power input and provide energy buffering. The initially processed current passes through the common-mode inductor L2 to suppress common-mode noise interference. Finally, the current passes through a combined capacitor structure consisting of ceramic capacitors C3 and C4 connected in parallel with different capacitance values. After high-frequency noise processing, the current supplies power to the next stage of the circuit.

[0044] Furthermore, the step-down circuit 1 uses a DC-DC converter chip.

[0045] Furthermore, step-down circuit 1 is used to convert 24V voltage into 5V DC voltage.

[0046] like Figure 3 The diagram shown is a detailed circuit structure of the step-down circuit. The 5V step-down circuit is built using a DC-DC converter chip. The IN pin serves as the power input terminal of the chip and is connected to a 24V voltage source. A ceramic capacitor C needs to be introduced between the IN pin and the GND pin. IN Decoupling; connect a ceramic capacitor C between the BS pin and the LX pin. BS This capacitor provides the drive voltage for the internal MOSFET. The FB pin is the voltage output feedback pin, which requires a voltage divider network of resistors R1 and R2 to set the output voltage. A ceramic capacitor C is connected in parallel with R1. FF This can accelerate the transient response of the load. The LX pin is an inductor pin and needs to be connected to the output inductor L3, with a 5V voltage output terminal V. OUT A ceramic capacitor C needs to be introduced between the ground and the ground. OUT Decoupling: The EN pin is the start-up control pin for the DC-DC chip. The high and low levels ON / OFF control whether the chip is working.

[0047] Furthermore, the CAN communication circuit 3 uses a CAN communication chip.

[0048] like Figure 4 The diagram shows the specific structure of the CAN communication circuit. This CAN communication circuit is built using a CAN communication chip and has output control signals. VBAT is the 24V power input terminal for battery power, i.e., VBAT is the first power input terminal for the CAN communication circuit. VCC is the 5V bus power supply, connected to the output power of the 5V step-down circuit, i.e., VCC is the second power input terminal for the CAN communication circuit. TXD and RXD pins are the communication interfaces between the CAN chip and the internal microcontroller. ST is the standby signal input port; after receiving the standby command from the microcontroller, the CAN communication chip enters sleep mode. CANH and CANL pins are the external communication ports of the CAN communication chip, i.e., the communication interface with the working circuit. Matching resistors are required to ensure normal communication. Common-mode inductors and ESD protection devices need to be added at the ports to filter common-mode interference and add ESD protection. IO is the switch control output pin; when the CAN chip receives the MCU standby signal, the IO pin outputs a high level, controlling the switch to turn off. The WAKE pin is the local wake-up input, used to receive the wake-up signal from the host computer and re-enable the CAN communication circuit to normal operation.

[0049] Furthermore, the battery sampling circuit 5 includes a temperature sampling circuit 51.

[0050] Furthermore, the battery sampling circuit 5 includes a voltage sampling circuit 52.

[0051] Furthermore, the low-power control circuit also includes a crystal oscillator circuit 6;

[0052] The crystal oscillator circuit 6 and the working circuit 4 are connected.

[0053] Furthermore, the low-power control circuit also includes input / output circuit 7;

[0054] The input / output circuit 7 and the working circuit 4 are connected.

[0055] Furthermore, the working circuit 4 is a microcontroller (MCU).

[0056] The normal operating circuit includes a filter circuit 8, a step-down circuit 1, a switching device 2, a CAN communication circuit 3, a working circuit 4, a crystal oscillator circuit 6, an input / output circuit 7 (i.e., an I / O circuit), a temperature sampling circuit 51, and a voltage sampling circuit 52.

[0057] The low-power operating circuit includes a filter circuit 8, a step-down circuit 1, a switching device 2, and a CAN communication circuit 3.

[0058] In normal operation, the external 24V power supply is converted into 5V power supply after passing through the filter circuit 8 and entering the 5V step-down circuit 1. The power supply is then supplied to the CAN communication circuit 3, the working circuit 4, the crystal oscillator circuit 6, and the input / output circuit 7 through the switching device 2 which is in the on state. The temperature sampling circuit 51 and the voltage sampling circuit 52 are powered by the battery pack.

[0059] The low-power operating circuit uses the CAN communication circuit 3 to send a control signal to control the switching device 2, causing it to be in an open circuit state. The operating circuit 4, crystal oscillator circuit 6, and input / output circuit 7 stop working because the switching device 2 is powered off. The temperature sampling circuit 51 and voltage sampling circuit 52 cannot receive the instructions from the operating circuit 4 and are in a shutdown state. The CAN communication circuit 3 switches to 24V power supply and is in working state. The CAN chip enters sleep mode.

[0060] The low-power operating circuit starts under the set application scenario. After testing, the operating power consumption is about one-tenth of that of the normal operating circuit.

[0061] When switching from low-power operation to normal operation, the external host computer needs to send specific frame data to the CAN chip to wake up the CAN chip and enter normal operation mode. The output control signal controls the switching device 2 to conduct, and the CAN communication circuit 3, the working circuit 4, the crystal oscillator circuit 6, and the input / output circuit 7 are reconnected to the 5V power supply, and the system starts normal operation mode.

[0062] The protected object of this utility model is the structure of the hardware device. The functions such as "control logic" and "configuration" mentioned in the specification are conventional or existing technical means used by those skilled in the art to realize the functions of the hardware device, and are not the innovation of this utility model. The innovation of this utility model lies in the novel arrangement and combination of the hardware structure.

[0063] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low-power control circuit for a BMS, characterized in that, Includes step-down circuit, switching devices, operating circuit, and CAN communication circuit; The voltage input terminal of the step-down circuit is connected to the power input terminal, and the voltage output terminal of the step-down circuit is connected to the first connection terminal of the switching device. The second connection terminal of the switching device is connected to the power supply input terminal of the working circuit; The first power supply input terminal of the CAN communication circuit is connected to the voltage input terminal of the step-down circuit, and the second power supply input terminal of the CAN communication circuit is connected to the second connection terminal of the switching device. The switch control output terminal of the CAN communication circuit is connected to the third connection terminal of the switching device. The CAN communication circuit is also communicatively connected to the working circuit. The working circuit is connected to the battery sampling module, and the battery sampling module is connected to the battery module.

2. The BMS low-power control circuit as described in claim 1, characterized in that, The low-power control circuit also includes a filter circuit, which is connected between the voltage input terminal of the buck circuit and the voltage source.

3. The BMS low-power control circuit as described in claim 1, characterized in that, The step-down circuit uses a DC-DC converter chip.

4. The BMS low-power control circuit as described in claim 1, characterized in that, The CAN communication circuit uses a CAN communication chip.

5. The BMS low-power control circuit as described in claim 1, characterized in that, The battery sampling module includes a temperature sampling circuit.

6. The BMS low-power control circuit as described in claim 1, characterized in that, The battery sampling module includes a voltage sampling circuit.

7. The BMS low-power control circuit as described in claim 1, characterized in that, The low-power control circuit also includes a crystal oscillator circuit; The crystal oscillator circuit and the working circuit are connected.

8. The BMS low-power control circuit as described in claim 1, characterized in that, The low-power control circuit also includes input / output circuits; The input / output circuit and the working circuit are connected.

9. A BMS low-power control circuit as described in claim 1, characterized in that, The step-down circuit is used to convert 24V voltage into 5V DC voltage.

10. A BMS low-power control circuit as described in claim 1, characterized in that, The operating circuit is a microcontroller.

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