Novel BMS awakening and activating circuit and circuit protection board

Abstract

The utility model provides a novel BMS wake-up and activation circuit and a circuit protection board, and the circuit comprises a front-end chip AFE, a processor MCU and a charging and discharging MOS tube, and is also additionally provided with a wake-up and activation module. The wake-up activation module is connected with the processor MCU, and the wake-up activation module comprises a digital isolation module, a transceiver module, a signal optocoupler module and some auxiliary circuits. The digital isolation module is used for isolating the transceiver module from the processor MCU. The transceiver module is used for converting a serial port signal into RS-485 or a CAN (Controller Area Network) during transmission; and during receiving, the RS-485 or CAN is converted into a serial port signal. And the signal optocoupler module is used for isolating a communication wake-up or activation signal and then transmitting the signal to the processor MCU. According to the scheme, the differential signal is effectively prevented from being interfered, the waveform quality of a communication link is not influenced, the signal load is not increased, and high-interference-resistance communication wakeup and activation are realized.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery management systems, in particular to a novel BMS (battery management system) wake-up and activation circuit and a circuit protection board. BACKGROUND

[0002] In a lithium battery protection board (BMS) scheme, because of the requirement for communication quality, more and more differential signal communication, such as RS-485 and CAN, is used. In order to have fewer interface leads, these differential communication lines often also have wake-up and activation functions. After the communication signal reaches the local area, it is divided into two paths, one of which is input to the transceiver to perform normal communication functions, and the other of which is connected to the wake-up and activation circuit to realize the wake-up and activation functions. This scheme is mature and reliable, low in cost, and is applied to many products, such as portable energy storage, cleaning vehicles, electric motorcycles, E-BIKE, tool energy storage, home energy storage and the like.

[0003] The design of the communication line serving as the wake-up and activation function begins to show its shortcomings under the requirements of an increasingly accelerated communication rate and a low bit error rate. The functional circuit connected in parallel with the communication line inevitably increases the load and parasitic capacitance on the signal line, which will cause waveform distortion and timing delay when the communication rate is slightly fast, and in severe cases, the bit error rate increases and even the transceiver overloads and protection occurs, resulting in communication failure. CONTENT OF THE INVENTION

[0004] To solve the above technical problems, the application provides a novel BMS wake-up and activation circuit and a circuit protection board, a digital isolation module is additionally provided in the application, and the serial port output of the transceiver module is used to realize the wake-up and activation of the BMS.

[0005] In a first aspect, the application provides a novel BMS wake-up and activation circuit, which comprises a front-end chip AFE, a processor MCU and a charge-discharge MOS tube; and further comprises a wake-up and activation module; the wake-up and activation module is connected with the processor MCU, and the wake-up and activation module comprises a digital isolation module, a transceiver module and a signal optocoupler module.

[0006] The digital isolation module is used to isolate the transceiver module and the processor MCU. The transceiver module is used to convert the serial port signal into RS-485 or CAN when transmitting, and convert RS-485 or CAN into a serial port signal when receiving. The signal optocoupler module is used to transmit the communication wake-up or activation signal to the processor MCU after isolation.

[0007] Further, the digital isolation module comprises a digital isolation chip U1.

[0008] The digital isolation chip U1 includes a VDD1 port, a VDD2 port, a VIA port, a VIO port, a VOB port, a GND1 port, and a GND2 port.

[0009] Further, the digital isolation module includes that the VDD1 port, the VIA port, and the VOB port are connected to the processor; the VDD2 port is connected to a first power supply; the GND1 port is connected to a first ground end; and the GND2 port is connected to a second ground end.

[0010] The digital isolation module is used for isolating a serial port signal connected between the transceiver module and the processor MCU.

[0011] Further, the transceiver module includes a transceiver chip U2.

[0012] The transceiver chip U2 includes an R port, a D port, a VCC port, and a GND port.

[0013] Further, the transceiver module includes that the R port is connected to the VDD1 port through a resistor R1; the D port is connected to a VOA port; the VCC port is connected to the first power supply; and the GND port is connected to the second ground end.

[0014] The transceiver module is used for converting the serial port signal into RS-485 or CAN when transmitting, and converting RS-485 or CAN into the serial port signal when receiving.

[0015] Further, the optocoupler module includes an optocoupler OC1, a transistor Q1, a diode D1, and a diode D2.

[0016] Further, the optocoupler module includes that a base of the transistor Q1 is connected to the R port, a collector of the transistor Q1 is connected to the second ground end, and an emitter of the transistor Q1 is connected to a 2 port of the optocoupler OC1; a 1 port of the optocoupler OC1 is connected to the first power supply, a 4 port of the optocoupler OC1 is connected to a cathode of the diode D1 and a cathode of the diode D2, and a 3 port of the optocoupler OC1 is connected to the first ground end; and an anode of the diode D2 and an anode of the diode D1 are connected to the processor.

[0017] The signal optocoupler module is used for transmitting a communication wake-up or activation signal to the processor MCU after isolation.

[0018] Directly driving OC1 with a communication signal will bring an additional load to a communication line, and the present scheme uses a receiving pin R of the transceiver module, that is, a serial port receiving, to convert a remote communication signal into a serial port signal of the MCU, uses this pin to make a wake-up and activation signal, and can achieve the design purpose without affecting a communication link impedance.

[0019] In a second aspect, the application provides a circuit protection board, comprising the novel BMS wake-up and activation circuit of the first aspect and a circuit substrate, wherein the novel BMS wake-up and activation circuit is integrated on the circuit substrate.

[0020] In summary, the application provides a novel BMS wake-up and activation circuit and a circuit protection board, wherein the BMS wake-up and activation module comprises an AFE, a processor MCU and a charge-discharge MOS tube, and the BMS wake-up and activation module is additionally provided with a wake-up and activation module; the wake-up and activation module is connected with the processor MCU, and comprises a digital isolation module, a transceiver module, a signal optocoupler module and some auxiliary circuits. The digital isolation module is used to isolate the transceiver module and the processor MCU. The transceiver module is used to convert serial port signals into RS-485 or CAN when transmitting, and convert RS-485 or CAN into serial port signals when receiving. The signal optocoupler module is used to transmit the communication wake-up or activation signal to the processor MCU after isolation.

[0021] Compared with the prior art, the application has at least the following beneficial effects:

[0022] The scheme effectively avoids interference of the differential signal, does not affect the waveform quality of the communication link, does not increase the signal load, and realizes high anti-interference communication wake-up and activation. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A novel BMS wake-up and activation circuit system structure diagram shown in the embodiments of the present application.

[0024] Figure 2 A wake-up and activation module structure diagram shown in the embodiments of the present application. DETAILED DESCRIPTION

[0025] In order to enable personnel in the art to better understand the application scheme, the technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, and not all the embodiments of the application.

[0026] Based on the embodiments in the application, all other embodiments obtained by the person skilled in the art without creative labor shall fall within the scope of protection of the application.

[0027] The following will be described in detail.

[0028] The terms "first", "second", "third" and "fourth" in the specification and claims of the application and the drawings refer to the relative position of the elements, and do not

[0029] The terms "first", "second", "third", etc. are used to distinguish different objects, rather than to describe a particular order. In addition, the term "comprising" and any variation thereof is intended to cover non-exclusive inclusion. For example, a system including a series of modules and devices is not limited to the listed modules and devices, but can optionally include modules and devices not listed, or can optionally include other modules and devices inherent to the system.

[0030] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor does it necessarily refer to a separate or alternative embodiment in isolation or in combination with other embodiments. It is expressly understood that the embodiments described herein can be combined with each other. Embodiments

[0031] As shown in the accompanying Figure 1 The application provides a novel BMS wake-up and activation circuit, which comprises a front-end chip AFE, a processor MCU and a charge-discharge MOS tube; further comprises a wake-up activation module; the wake-up activation module is connected with the processor MCU, and the wake-up activation module comprises a digital isolation module, a transceiver module and a signal optocoupler module.

[0032] The digital isolation module is used for isolating the transceiver module and the processor MCU. The transceiver module is used for converting serial port signals into RS-485 or CAN when transmitting, and converting RS-485 or CAN into serial port signals when receiving. The signal optocoupler module is used for transmitting the communication wake-up or activation signal to the processor MCU after isolation.

[0033] As shown in the accompanying Figure 2 The wake-up activation module provided in the embodiment of the application, in the embodiment of the application, the digital isolation module comprises a digital isolation chip U1.

[0034] The digital isolation chip U1 comprises a VDD1 port, a VDD2 port, a VIA port, a VIO port, a VOB port, a GND1 port and a GND2 port.

[0035] In the embodiment of the application, the digital isolation module comprises the VDD1 port, the VIA port and the VOB port connected with the processor; the VDD2 port is connected with a first power supply MAIN3V3; the GND1 port is connected with a first ground end GND; and the GND2 port is connected with a second ground end MAIN_GND.

[0036] The digital isolation module is used for isolating the serial port signal connected with the processor MCU.

[0037] In the embodiment of the utility model, optionally, the model of the digital isolation chip is π121U31, it has eight pins, and the working voltage is 5.5V.

[0038] It should be noted that the digital isolation chip can also be other types of digital isolators.

[0039] In the embodiment of the utility model, optionally, the transceiver module includes: a transceiver chip U2.

[0040] The transceiver chip U2 includes: an R port, a D port, a VCC port and a GND port.

[0041] In the embodiment of the utility model, optionally, the transceiver module includes: the R port is connected with the VDD1 port through resistance R1;The D port is connected with the VOA port;The VCC port is connected with the first power supply MAIN3V3;The GND port is connected with the second ground end MAIN_GND.

[0042] The transceiver module is used for converting the serial port signal into RS-485 or CAN when transmitting;And converting RS-485 or CAN into serial port signal when receiving.

[0043] In the embodiment of the utility model, optionally, the transceiver chip is RS-485 transceiver, and it should be noted that it can also be CAN or other transceiver.

[0044] RS-485 transceiver is a kind of equipment for serial communication, and is widely used in industrial control, building automation and remote sensor fields.

[0045] RS-485 uses differential signal transmission, can effectively resist noise interference, improve the reliability of communication, and support connecting multiple devices on the same bus, usually 32 transceivers can be connected.

[0046] RS-485 can communicate within a maximum distance of 1200 meters, suitable for wide range of network applications, usually support up to 10 Mbps transmission rate. According to the design needs, half-duplex or full-duplex communication mode can be selected.

[0047] In the embodiment of the utility model, optionally, the optical coupling module includes: optical coupling OC1, triode Q1, diode D1 and diode D2.

[0048] In the embodiment of the utility model, optional, the light coupling module includes: the base of the triode Q1 connects the R port, the collector of the triode Q1 connects the second ground terminal MAIN GND, the emitter of the triode Q1 connects the 2 port of the photocoupler OC1;The 1 port of the photocoupler OC1 is connected with the first power supply MAIN 3V3, the 4 port of the photocoupler OC1 is connected with the cathode of the diode D1 and the cathode of the diode D2, and the 3 port of the photocoupler OC1 is connected with the first ground terminal GND;The anode of the diode D2 and the anode of the diode D1 are connected with the processor.

[0049] The signal light coupling module is used for transmitting the communication wake-up or activation signal to the processor MCU after isolation.

[0050] Directly driving OC1 with communication signal will bring additional load to communication line, and the receiving pin R of the transceiver module, i.e. serial port receiving, has converted the remote communication signal into serial port signal of MCU, so that the design purpose can be achieved without affecting the communication link impedance.

[0051] Optocoupler (opto-coupler) is an electronic component, mainly used for isolation and transmission of signals. It realizes electrical isolation between input and output through optical signals, and is widely used in power electronics, communication, control systems and other fields.

[0052] Optocoupler can effectively isolate the input and output parts, prevent high voltage or noise from affecting the control circuit, and improve the safety and reliability of the system. The input electrical signal is converted into an optical signal, and then converted back into an electrical signal through an optoelectronic element (such as a photodiode), ensuring the integrity of the signal during transmission. Optocoupler usually has fast switching speed, suitable for high-frequency signal transmission.

[0053] As shown in the accompanying Figure 2 In the embodiment of the utility model, optional, the transceiver module further includes a peripheral circuit, and the peripheral circuit includes: resistors R2, R3, R4, R5, R6, bidirectional voltage stabilizing diodes TV1, TV2, TV3 and a connector J1.

[0054] R2 is connected between the VCC port and the A / Y port, R3 is connected between the B / Z port and the GND port. The B / Z port is connected with the 1 port of J1 through R4. The A / Y port is connected with the 2 port of J1 through R5. R6 is connected between the 1 port and the 2 port of J1. TV3 is connected between the A / Y port and the B / Z port. One end of TV1 and TV2 is connected with R6, and the other end is connected with the second ground terminal MAIN GND.

[0055] The receiving pin R port of the transceiver chip, that is, the serial port receives, has converted the remote communication signal into the serial port signal of the MCU, and the pin is used to send the wake-up and activation signal, so that the design purpose is achieved, but the communication link impedance is not affected. The R port in the circuit is pulled up by R1, and is always kept at a high level. When there is a correct protocol waveform on the communication link, a high-low change level is generated on the R pin. When the R pin is at a low level, the PNP transistor Q1 is turned on, and then the optocoupler OC1 is turned on, so that a low level is obtained on the isolated 485_INT. The 485_INT is connected to the interrupt pin of the MCU, so that the MCU is woken up from the low-power state. Similarly, a low level appears on the M_WAK, and the M_WAK is connected to the activation circuit, so that the device in the power-off state is activated and started. Embodiments

[0056] The circuit protection board provided in the present application comprises the novel BMS wake-up and activation circuit and the circuit substrate in the first embodiment, and the novel BMS wake-up and activation circuit is integrated on the circuit substrate.

[0057] In summary, the present application provides a novel BMS wake-up and activation circuit and a circuit protection board. The BMS wake-up and activation module comprises an AFE, a processor MCU and a charge-discharge MOS tube, and the wake-up and activation module is additionally provided. The wake-up and activation module is connected to the processor MCU, and comprises a digital isolation module, a transceiver module, a signal optocoupler module and some auxiliary circuits. The digital isolation module is used to isolate the transceiver module and the processor MCU. The transceiver module is used to convert the serial port signal into RS-485 or CAN when transmitting, and convert RS-485 or CAN into a serial port signal when receiving. The signal optocoupler module is used to transmit the communication wake-up or activation signal to the processor MCU after isolation.

[0058] The present application effectively avoids the interference of the differential signal, does not affect the waveform quality of the communication link, does not increase the signal load, and realizes high anti-interference communication wake-up and activation.

[0059] In the several embodiments provided in the present application, it should be understood that each block in the flowchart or block diagram can represent a module, a program segment or a part of code, which contains one or more executable instructions for implementing a specified logic function. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur in different orders from those noted in the accompanying drawings. For example, two consecutive blocks can actually be executed in parallel, and sometimes they can be executed in reverse order, depending on the functions involved.

[0060] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the parts that contribute to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing an electronic device to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0061] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the protection scope of the present application. It is particularly pointed out that any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A novel BMS wake-up and activation circuit comprising: The front-end chip AFE and the processor MCU are characterized in further comprising: a wake-up activation module; the wake-up activation module is connected with the processor MCU, and the wake-up activation module comprises: a digital isolation module, a transceiver module and a signal optocoupler module.

2. The BMS wake-up and activation circuit of claim 1, wherein, The digital isolation module comprises: a digital isolation chip U1. The digital isolation chip U1 comprises: a VDD1 port, a VDD2 port, a VIA port, a VIO port, a VOB port, a GND1 port and a GND2 port.

3. The BMS wake-up and activation circuit of claim 2, wherein, The digital isolation module comprises: the VDD1 port, the VIA port and the VOB port are connected with the processor; the VDD2 port is connected with a first power supply; the GND1 port is connected with a first ground end; and the GND2 port is connected with a second ground end.

4. The BMS wake-up and activation circuit of claim 3, wherein, The transceiver module comprises: a transceiver chip U2. The transceiver chip U2 comprises: an R port, a D port, a VCC port and a GND port.

5. The BMS wake-up and activation circuit of claim 4, wherein, The transceiver module comprises: the R port is connected with the VDD1 port through a resistor R1; the D port is connected with a VOA port; the VCC port is connected with the first power supply; and the GND port is connected with the second ground end.

6. The BMS wake-up and activation circuit of claim 5, wherein, The optocoupler module comprises: an optocoupler OC1, a triode Q1, a diode D1 and a diode D2.

7. The BMS wake-up and activation circuit of claim 6, wherein, The optocoupler module comprises: a base of the triode Q1 is connected with the R port, a collector of the triode Q1 is connected with the second ground end, an emitter of the triode Q1 is connected with a 2 port of the optocoupler OC1; a 1 port of the optocoupler OC1 is connected with the first power supply, a 4 port of the optocoupler OC1 is connected with a cathode of the diode D1 and a cathode of the diode D2, a 3 port of the optocoupler OC1 is connected with a first ground end; an anode of the diode D2 and an anode of the diode D1 are connected with the processor.

8. A circuit protection board comprising: The novel BMS wake-up and activation circuit and the circuit substrate according to any one of claims 1-7, wherein the novel BMS wake-up and activation circuit is integrated on the circuit substrate.

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