Control circuit for realizing master-slave communication of storage battery based on daisy chain
By adopting a daisy chain-based master-slave communication control circuit in high-voltage systems, the problem of long-wire harness and isolation devices required for communication between master and slave control is solved, and efficient master-to-slave control control is achieved, reducing hardware cost and structural complexity.
Patent Information
- Application Number
- CN202422092434.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-28
AI Technical Summary
In high voltage systems, communication between master and slave control requires a long communication harness and additional isolation devices, resulting in increased hardware cost and structural complexity.
A master-slave communication control circuit based on daisy chain is designed to realize the power-up and power-down of master-to-slave control through daisy chain communication, avoiding the addition of additional control wiring harness and isolation optocouplers.
It realizes efficient control of master and slave control without adding additional hardware, saving structural wiring harness and hardware costs, and reducing the complexity of software code.
Smart Images
Figure CN223039681U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium batteries, and particularly to a master-slave communication control circuit for a storage battery based on a daisy chain. Background Technique
[0002] With the innovation of technology and the demand for cost reduction, a new communication method, namely two-wire daisy chain communication, is used in AFE acquisition chips. It not only has high communication speed and stability, but also greatly reduces the communication wire harness and cost between the master and slave machines.
[0003] In the current high-voltage system, the communication between the master control (BCU) and the slave control (BMU) is basically replaced by daisy chain communication instead of the traditional CAN or RS485 communication. However, in the current solution, if the master control wants to control the power on and off of the slave control, a long communication wire harness is required in terms of structure, isolation devices such as optocouplers need to be added in terms of hardware, and the pin resources of the controller also need to be occupied. Summary of the Invention
[0004] The utility model aims to overcome the deficiencies of the prior art and provides a master-slave communication control circuit for a storage battery based on a daisy chain. On the basis of daisy chain communication, the power on and off of the slave control by the master control is realized without adding other control wire harnesses and isolation optocouplers, thereby further saving the structure wire harness and hardware cost.
[0005] To achieve the above object, a master-slave communication control circuit for a storage battery based on a daisy chain is designed, which includes a battery master controller and a battery slave controller. The feature is that the battery master controller is sequentially connected to a plurality of battery slave controllers by a daisy chain;
[0006] The battery master controller includes an MCU, a communication chip, and a first transformer. The SPI communication interface of the MCU is connected to the SPI communication interface of the communication chip, and the daisy chain interface of the communication chip is connected to the first transformer;
[0007] The battery slave controller includes a second transformer, an AFE acquisition chip, capacitors, resistors, MOS transistors, and TVS diodes. The first transformer is connected to the second transformer, and the second transformer is connected to the AFE acquisition chip through a daisy chain interface. The 5V power output of the AFE acquisition chip is connected to one end of the first resistor, and the other end of the first resistor is respectively connected to one end of the first capacitor, one end of the second resistor, and the gate of the first MOS transistor. The other ends of the first capacitor, the second resistor, and the source of the first MOS transistor are combined and grounded; the drain of the first MOS transistor is connected to one end of the third resistor, and the other end of the third resistor is respectively connected to one end of the fourth resistor and the gate of the second MOS transistor. The source of the second MOS transistor is connected to the BMU power supply terminal VDC, and the drain of the second MOS transistor is respectively connected to the other end of the fourth resistor, one end of the second capacitor, the cathode of the TVS diode, and the battery positive electrode. The anode of the TVS diode is grounded, the other end of the second capacitor is grounded, and the grounding point is connected to the battery negative electrode.
[0008] The MCU is an MCU with an SPI interface.
[0009] The model of the MCU is GD32F427ZGT6.
[0010] The communication chip is an SPI-to-daisy chain communication chip, and the communication chip is matched with the AFE acquisition chip.
[0011] The model of the communication chip is BQ79600.
[0012] The first transformer and the second transformer are special transformers for daisy chain.
[0013] The models of the first transformer and the second transformer are HM2103NLT.
[0014] The model of the AFE acquisition chip is BQ79616.
[0015] The first MOS transistor is an NMOS, and the second MOS transistor is a PMOS.
[0016] The model of the first MOS transistor is BSS123-7-F, and the model of the second MOS transistor is YJS05GP10A.
[0017] Compared with the prior art, the present invention provides a master-slave communication control circuit for a storage battery based on daisy chain. On the basis of daisy chain communication, other control wire harnesses and isolation optocouplers are not added to realize the power-on and power-off of the master control to the slave control, thereby further saving the structural wire harness and hardware cost; reducing the cost required for the communication wire harness and isolation devices between the master and the slave, making full use of the AFE peripheral function, and reducing the software code. Description of the Drawings
[0018] Figure 1 This is a schematic diagram of the connection of the frame structure of the present utility model.
[0019] Figure 2 This is the circuit diagram of the connection between the main battery controller and the slave battery controller of the present utility model. Specific embodiments
[0020] The following further describes the present utility model with reference to the accompanying drawings.
[0021] As Figure 1 shown, the main battery controller BCU is connected to a number of slave battery controllers BMU in sequence using a daisy chain.
[0022] Between the controller MCU of the main battery controller BCU and the communication chip is SPI communication. The communication chip communicates with the AFE acquisition chip U5 of the slave battery controller BMU through a daisy chain. The isolation method uses transformers, namely the first transformer U3 and the second transformer U4 for isolation. Through daisy chain communication, the main battery controller BCU can wake up the AFE acquisition chip U5 of the slave battery controller BMU, obtain data such as temperature and voltage collected by the AFE acquisition chip U5, and control battery balancing. It can also put the AFE acquisition chip U5 into sleep or stop it from working.
[0023] As Figure 2 shown, the main battery controller BCU includes an MCU, a communication chip U2, and a first transformer U3. The SPI communication interface of the MCU is connected to the SPI communication interface of the communication chip U2. The daisy chain interface of the communication chip U2 is connected to the first transformer U3. The slave battery controller BMU includes a second transformer U4, an AFE acquisition chip U5, capacitors, resistors, MOS transistors, and a TVS diode. The first transformer U3 is connected to the second transformer U4. The second transformer U4 is connected to the AFE acquisition chip U5 through a daisy chain interface. The 5V power output of the AFE acquisition chip U5 is connected to one end of the first resistor R3. The other end of the first resistor R3 is respectively connected to one end of the first capacitor C2, one end of the second resistor R4, and the gate of the first MOS transistor Q2. The other ends of the first capacitor C2, the second resistor R4, and the source of the first MOS transistor Q2 are combined and grounded. The drain of the first MOS transistor Q2 is connected to one end of the third resistor R2. The other end of the third resistor (R2) is respectively connected to one end of the fourth resistor R1 and the gate of the second MOS transistor Q1. The source of the second MOS transistor Q1 is connected to the BMU power supply terminal VDC. The drain of the second MOS transistor Q1 is respectively connected to the other end of the fourth resistor R1, one end of the second capacitor C1, the cathode of the TVS diode D1, and the battery positive terminal. The anode of the TVS diode D1 is grounded. The other end of the second capacitor C1 is grounded. These grounding points are connected to the battery negative terminal.
[0024] The MCU U1 of the battery master controller BCU communicates with the communication chip U2 through the SPI communication line. The communication between the communication chip U2 and the AFE acquisition chip U5 of the battery slave controller BMU is daisy-chain communication. When starting up, the AFE acquisition chip U5 of the battery slave controller BMU is woken up through the daisy chain. At this time, the AFE acquisition chip U5 outputs a 5V voltage, making the first MOS transistor Q2 conduct, and thus the second MOS transistor Q1 conducts. At this time, the battery VDC terminal = B+; when shutting down, the AFE acquisition chip U5 of the battery slave controller BMU is controlled to SHUTDOWN through the daisy chain. The AFE acquisition chip U5 stops outputting the 5V voltage, the first MOS transistor Q2 is turned off, and thus the second MOS transistor Q1 is also turned off. At this time, the battery VDC terminal = 0V.
[0025] The MCU is an MCU with an SPI interface, such as: GD32F427ZGT6.
[0026] The communication chip U2 is an SPI-to-daisy-chain communication chip, such as: BQ79600. The communication chip U2 is matched with the AFE acquisition chip U5.
[0027] The first transformer U3 and the second transformer U4 are daisy-chain dedicated transformers, such as: HM2103NLT.
[0028] The model of the AFE acquisition chip U5 is BQ79616.
[0029] The first MOS transistor Q2 is an NMOS, such as: BSS123-7-F, and the second MOS transistor Q1 is a PMOS, such as: YJS05GP10A.
[0030] This utility model utilizes the fact that after the AFE acquisition chip is woken up by daisy-chain communication, the AFE acquisition chip will have an analog power supply output (5V or 3.3V). When the AFE acquisition chip receives the sleep or SHUTDOWN command, this analog power supply will stop outputting. This characteristic can be used as a switch to control the power-on and power-off of the entire slave control board.
Claims
1. A master-slave communication control circuit for a battery based on a daisy chain, comprising a battery master controller and a battery slave controller, characterized in that: The battery master controller uses a daisy chain to connect several battery slave controllers in sequence; The battery main controller comprises an MCU (U1), a communication chip (U2), and a first transformer (U3); the SPI communication interface of the MCU (U1) is connected to the SPI communication interface of the communication chip (U2), and the daisy chain interface of the communication chip (U2) is connected to the first transformer (U3); The battery slave controller comprises a second transformer (U4), an AFE acquisition chip (U5), a capacitor, a resistor, a MOS tube, and a TVS tube. The first transformer (U3) is connected to the second transformer (U4), the second transformer (U4) is connected to the AFE acquisition chip (U5) through a daisy chain interface, the 5V power output port of the AFE acquisition chip (U5) is connected to one end of the first resistor (R3), the other end of the first resistor (R3) is respectively connected to one end of the first capacitor (C2), one end of the second resistor (R4), and the gate of the first MOS tube (Q2), the other end of the first capacitor (C2), the other end of the second resistor (R4), The source of the first MOS tube (Q2) is combined and grounded; the drain of the first MOS tube (Q2) is connected to one end of the third resistor (R2); the other end of the third resistor (R2) is respectively connected to one end of the fourth resistor (R1) and the gate of the second MOS tube (Q1); the source of the second MOS tube (Q1) is connected to the BMU power supply terminal VDC; the drain of the second MOS tube (Q1) is respectively connected to the other end of the fourth resistor (R1), one end of the second capacitor (C1), the cathode of the TVS tube (D1), and the positive electrode of the battery; the anode of the TVS tube (D1) is grounded; and the other end of the second capacitor (C1) is grounded; the grounding is connected to the negative electrode of the battery.
2. A daisy chain-based master-slave communication control circuit for batteries according to claim 1, characterized in that: The MCU (U1) is an MCU with an SPI interface.
3. The master-slave communication control circuit for realizing a battery based on a daisy chain according to claim 2, characterized in that: The model of the MCU is GD32F427ZGT6.
4. The master-slave communication control circuit for realizing a battery based on a daisy chain according to claim 1, characterized in that: The communication chip (U2) is a SPI to daisy chain communication chip, and the communication chip (U2) matches the AFE acquisition chip (U5).
5. The master-slave communication control circuit for realizing a battery based on a daisy chain according to claim 4, characterized in that: The model of the communication chip (U2) is BQ79600.
6. The master-slave communication control circuit for realizing a battery based on a daisy chain according to claim 1, characterized in that: The first transformer (U3) and the second transformer (U4) are dedicated daisy chain transformers.
7. The master-slave communication control circuit for realizing batteries based on daisy chain according to claim 6, characterized in that: The models of the first transformer (U3) and the second transformer (U4) are HM2103NLT.
8. The master-slave communication control circuit for realizing batteries based on daisy chain according to claim 1, characterized in that: The model of the AFE acquisition chip (U5) is BQ79616.
9. The master-slave communication control circuit for realizing batteries based on daisy chain according to claim 1, characterized in that: The first MOS tube (Q2) is an NMOS, and the second MOS tube (Q1) is a PMOS.
10. A daisy chain-based master-slave communication control circuit for batteries according to claim 9, characterized in that: The model of the first MOS tube (Q2) is BSS123-7-F, and the model of the second MOS tube (Q1) is YJS05GP10A.