BMS protection system with high-power MOS acceleration circuit

Abstract

The utility model discloses a BMS protection system with a large power MOS acceleration circuit, comprising a voltage stabilization power supply circuit, a driving circuit and an acceleration circuit, the voltage stabilization power supply circuit is used for connecting an external power supply and outputting a stable direct current to the driving circuit, the driving circuit is connected with an internal power supply pin of a driving control chip, and the acceleration circuit is connected with the driving control chip. The control circuit is also connected to the input end of the acceleration circuit. According to the embodiment of the invention, the accurate, efficient and rapid control of the charging and discharging process of the battery is realized, the safety and reliability of the battery system are improved, the overall energy consumption and cost of the system are reduced, and powerful support is provided for the development of the fields of new energy automobiles, energy storage systems and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to BMS protection technical field, concretely relates to a BMS protection system with high -power MOS acceleration circuit. BACKGROUND

[0002] As the core of the battery management system, BMS is mainly responsible for intelligent management and maintenance of each battery unit, preventing overcharge and overdischarge of the battery, prolonging the service life of the battery, and monitoring the state of the battery. With the continuous improvement of the performance requirements of electric vehicles, energy storage systems and various precision equipment on the battery, the function and performance of BMS also face greater challenges. Especially in high-power application scenarios, such as high-speed driving of electric vehicles, rapid charge and discharge of energy storage systems, higher requirements are put forward for the protection system of BMS.

[0003] In high-power applications, MOS (metal oxide semiconductor field effect transistor) as a key switching element, its switching speed directly affects the response speed and efficiency of the system. Because the driving current of high-power MOS is relatively large, relying only on the internal power supply of the protection chip cannot work normally. The traditional MOS switching circuit may be limited in switching speed and even produce surge voltage due to the influence of factors such as gate resistance, wire stray inductance, etc. when switching at high speed, which causes damage to the system. Therefore, introducing a high-power MOS acceleration circuit, optimizing the gate drive circuit and improving the switching speed of MOS are of great significance to improve the performance of the BMS protection system. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a BMS protection system with high-power MOS acceleration circuit, which can realize rapid voltage release.

[0005] The purpose of the utility model is realized by the following technical scheme:

[0006] The utility model provides a BMS protection system with high-power MOS acceleration circuit, including voltage stabilizing power supply circuit, drive circuit and acceleration circuit, voltage stabilizing power supply circuit is used for connecting external power supply and exports stable direct current to drive circuit, drive circuit connects the internal power supply pin of drive control chip, still connects to the input end of acceleration circuit.

[0007] In the utility model, as an optional embodiment, the acceleration circuit includes diode D11, voltage stabilizing tube ZD6, triode Q16, triode Q17, resistance R33, resistance R59, resistance R60, resistance R61, resistance R62 and MOS tube U2, the drain electrode of MOS tube U2 is connected with the overvoltage protection pin of drive control chip, the source electrode of MOS tube U2 is connected with the anode of voltage stabilizing tube ZD6, one end of resistance R61, one end of resistance R62, the emitter of triode Q17, one end of resistance R60 and the battery pack of outside respectively, one end of resistance R33 is connected with the gate electrode of MOS tube U2, the other end of resistance R33, the negative pole of voltage stabilizing tube ZD6 and the other end of resistance R61 are all connected with one end of resistance R59, the other end of resistance R59 and the negative pole of diode D11 are all connected with the emitter of triode Q16, the collector of triode Q16 and the other end of resistance R62 are all connected with the base of triode Q17, the anode of diode D11, the base of triode Q16, the collector of triode Q17 and the other end of resistance R60 are all connected with drive circuit.

[0008] In the utility model, as an optional embodiment, the drive circuit includes resistance R55, resistance R56, resistance R57, resistance R58, voltage stabilizing tube ZD5, diode D9, diode D10, MOS tube Q15, triode Q14, one end of resistance R56 is connected with the internal power supply pin of drive control chip, the other end of resistance R56, one end of resistance R58 and the negative pole of voltage stabilizing tube ZD5 are all connected with the gate electrode of MOS tube Q15, the other end of resistance R58 and the positive pole of voltage stabilizing tube ZD5 are all connected with the source electrode of MOS tube Q15, the drain electrode of MOS tube Q15 is connected with the negative pole of diode D9, one end of resistance R57 is connected with the positive pole of diode D9, the other end of resistance R57 and the base of triode Q14 are all connected with one end of resistance R55, the other end of resistance R55 and the emitter of triode Q14 are all connected with voltage stabilizing power supply circuit, the collector of triode Q14 is connected with the positive pole of diode D10, and the negative pole of diode D10 is connected with the positive pole of diode D11.

[0009] In the utility model, as an optional embodiment, the voltage stabilizing power supply circuit includes diode D47, resistance R40, resistance R41, triode Q37 and voltage stabilizing tube ZD16, the positive pole of diode D47 is connected with external power supply, the negative pole of diode D47 is connected with one end of resistance R41 through resistance R40, one end of resistance R41 is also connected with the collector of triode Q37, the emitter of triode Q37 outputs direct current, the other end of resistance R41 and the base of triode Q37 are all connected with the negative pole of voltage stabilizing tube ZD16, and the positive pole of voltage stabilizing tube ZD16 is grounded.

[0010] In the utility model, as an optional embodiment, the voltage of direct current is 12V.

[0011] In the utility model, as an optional embodiment, the model of the drive control chip is AMG8803.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] The voltage stabilizing power supply circuit is responsible for receiving raw electric energy from an external power supply and converting it into stable and low-noise direct current through an internal conversion mechanism, which not only ensures the stable operation of subsequent circuits but also reduces the influence of power fluctuations on system performance, improves the reliability and service life of the system; the drive circuit receives control signals of the BMS main controller, thereby driving the switching state of the high-power MOS tube, so as to realize accurate control over the battery charging and discharging process; the acceleration circuit is the core circuit of the embodiment and is used for accelerating the switching process of the MOS tube under the control of the drive signal; the acceleration circuit improves the overall efficiency and response speed of the system by optimizing the gate drive waveform of the MOS tube, reducing switching time and reducing switching loss; the embodiment realizes accurate, efficient and fast control over the battery charging and discharging process, improves the safety and reliability of the battery system, reduces the overall energy consumption and cost of the system, and provides strong support for the development of new energy vehicles, energy storage systems and other fields. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 FIG. 1 is a module structure schematic diagram of a BMS protection system with a high-power MOS acceleration circuit according to an embodiment of the utility model;

[0015] Figure 2 FIG. 2 is a circuit structure schematic diagram of a drive circuit and an acceleration circuit according to an embodiment of the utility model;

[0016] Figure 3 FIG. 3 is a circuit structure schematic diagram of a voltage stabilizing power supply circuit according to an embodiment of the utility model. DETAILED DESCRIPTION

[0017] In the following, the utility model is further described in combination with the drawings and the specific implementation manner, and it should be noted that, under the premise of no conflict, the following described embodiments or technical features can be combined to form new embodiments. Except for the special description, the materials and equipment used in the embodiment can be purchased from the market. The examples of the embodiment are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the application and cannot be understood as a limitation on the application.

[0018] In the description of the application, it needs to be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise specifically specified and limited.

[0019] In the description of the application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "connected", "communicated", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0020] The terms "first", "second", and the like in the specification and claims of the application and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0021] The embodiment of the application provides a BMS protection system with a high-power MOS acceleration circuit, as shown in the figure, which comprises a voltage stabilizing power supply circuit, a driving circuit and an acceleration circuit. Figure 1 The voltage stabilizing power supply circuit is used for connecting an external power supply and outputting stable direct current to the driving circuit, the driving circuit is connected to the internal power supply pin of the driving control chip, and is also connected to the input end of the acceleration circuit.

[0022] In the above embodiment, the voltage stabilizing power supply circuit is responsible for receiving raw power from an external power source and converting it into stable and low-noise direct current through an internal conversion mechanism, which not only ensures the stable operation of subsequent circuits but also reduces the impact of power fluctuations on system performance, improving the reliability and lifespan of the system; the drive circuit receives control signals from the BMS main controller, thereby driving the switching state of the high-power MOS tube, thereby achieving precise control over the battery charging and discharging process; the acceleration circuit is the core circuit of the embodiment and is used to accelerate the switching process of the MOS tube under the control of the drive signal. The acceleration circuit improves the overall efficiency and response speed of the system by optimizing the gate drive waveform of the MOS tube, reducing switching time, and reducing switching loss; the embodiment achieves precise, efficient, and fast control over the battery charging and discharging process, which not only improves the safety and reliability of the battery system but also reduces the overall energy consumption and cost of the system, providing strong support for the development of new energy vehicles, energy storage systems, and other fields.

[0023] Please refer to Figure 2 In the BMS protection system provided by the embodiment, the core acceleration circuit includes diode D11, voltage stabilizing tube ZD6, triode Q16, triode Q17, resistor R33, resistor R59, resistor R60, resistor R61, resistor R62, and MOS tube U2. The drain of the MOS tube U2 is connected to the overvoltage protection pin of the drive control chip. The source of the MOS tube U2 is connected to the anode of the voltage stabilizing tube ZD6, one end of the resistor R61, one end of the resistor R62, the emitter of the triode Q17, one end of the resistor R60, and an external battery pack. The gate of the MOS tube U2 is connected to one end of the resistor R33. The other end of the resistor R33, the negative electrode of the voltage stabilizing tube ZD6, and the other end of the resistor R61 are all connected to one end of the resistor R59. The other end of the resistor R59 and the negative electrode of the diode D11 are both connected to the emitter of the triode Q16. The collector of the triode Q16 and the other end of the resistor R62 are both connected to the base of the triode Q17. The anode of the diode D11, the base of the triode Q16, the collector of the triode Q17, and the other end of the resistor R60 are all connected to the drive circuit. In the embodiment, the model of the drive control chip is AMG8803. AMG8803 is a high-reliability and high-performance SOC-level lithium battery pack main control chip with all-in-one function designed for 5 to 8 lithium battery packs.

[0024] The MOS tube U2 is the key element of the circuit, and its drain is connected to the over-voltage protection pin of the drive control chip. This means that when the battery system appears over-current, over-voltage and other abnormal conditions, the drive control chip can quickly control the switching state of the MOS tube U2 through this pin to protect the battery pack from damage. The gate of the MOS tube U2 is connected to the core part of the acceleration circuit through the resistor R33. The resistor R33 is used to limit the gate current and protect the MOS tube U2 from damage by transient voltages such as electrostatic discharge. The other end of the resistor R33 is connected to one end of the resistor R59 together with the negative electrode of the Zener tube ZD6 and the other end of the resistor R61. The Zener tube ZD6 here plays the role of stabilizing the gate voltage, preventing damage to the MOS tube U2 due to excessively high gate voltage. Diode D11 as a protection element, to prevent reverse voltage damage to the circuit. Triode Q16 and Q17 constitute an amplification circuit for amplifying the control signal from the drive circuit and driving the gate of the MOS tube U2 to achieve acceleration. Resistors R61, R62 and R60 play the role of voltage division and feedback in the circuit. They are connected to the source and gate of the MOS tube U2, and affect the gate voltage through the voltage division ratio, thereby controlling the switching state of the MOS tube U2.

[0025] Further, the drive circuit includes resistor R55, resistor R56, resistor R57, resistor R58, Zener tube ZD5, diode D9, diode D10, MOS tube Q15, triode Q14, one end of the resistor R56 is connected to the internal power supply pin of the drive control chip, the other end of the resistor R56, one end of the resistor R58 and the negative electrode of the Zener tube ZD5 are all connected to the gate of the MOS tube Q15, the other end of the resistor R58 and the positive electrode of the Zener tube ZD5 are all connected to the source of the MOS tube Q15, the drain of the MOS tube Q15 is connected to the negative electrode of the diode D9, the positive electrode of the diode D9 is connected to one end of the resistor R57, the other end of the resistor R57 and the base of the triode Q14 are all connected to one end of the resistor R55, the other end of the resistor R55 and the emitter of the triode Q14 are all connected to the stable power supply circuit, the collector of the triode Q14 is connected to the positive electrode of the diode D10, and the negative electrode of the diode D10 is connected to the positive electrode of the diode D11.

[0026] The resistor R58 and the voltage stabilizing tube ZD5 constitute a simple voltage stabilizing circuit for protecting the gate of the MOS tube Q15 from excessive voltage. When the gate voltage exceeds the voltage stabilizing value of the voltage stabilizing tube ZD5, the voltage stabilizing tube will be turned on, and the excess voltage will be shunted to the ground, thereby protecting the MOS tube. The source of the MOS tube Q15 is directly connected to the voltage stabilizing power supply circuit to provide a stable power supply voltage for it. The voltage level of the gate of the MOS tube Q15 is determined by the voltage division of the resistors R56 and R58 and the voltage stabilizing effect of the voltage stabilizing tube ZD5. This design not only ensures the stability of the gate voltage, but also prevents damage to the MOS tube due to excessive voltage. The drain of the MOS tube Q15 is connected to the negative electrode of the diode D9, which serves as a protective element to prevent reverse voltage from damaging the MOS tube Q15 or subsequent circuits. When the drive control chip sends a control signal, the gate voltage of the MOS tube Q15 is adjusted through the voltage division of the resistors R56 and R58 and the voltage stabilizing effect of the voltage stabilizing tube ZD5, thereby controlling the conduction degree of the MOS tube Q15.

[0027] As shown in Figure 3 The voltage stabilizing power supply circuit includes a diode D47, a resistor R40, a resistor R41, a triode Q37, and a voltage stabilizing tube ZD16. The positive electrode of the diode D47 is connected to an external power supply, the negative electrode of the diode D47 is connected to one end of the resistor R40, one end of the resistor R41 is also connected to the collector of the triode Q37, the emitter of the triode Q37 outputs direct current, the other end of the resistor R41 and the base of the triode Q37 are both connected to the negative electrode of the voltage stabilizing tube ZD16, and the positive electrode of the voltage stabilizing tube ZD16 is grounded. The voltage stabilizing power supply circuit is protected by the diode D47, the voltage is divided and the current is limited by the resistors R40 and R41, the output voltage is stabilized by the voltage stabilizing tube ZD16, and the stability of the output voltage is further improved by the amplification effect of the triode Q37. Among them, the voltage of the direct current is 12V.

[0028] MOS tube Q15 and triode Q14 as switch control MOS drive voltage, when the internal power supply pin has high level, MOS tube Q15 and triode Q14 conduction, direct current V12 through diode D10, diode D11 to MOS tube U2 gate power supply, the circuit works normally. When the internal power supply pin output low level, MOS tube Q15 cut-off work, triode Q14 also stop working, because direct current V12 can not normal power supply, then C01 from high level to low level, when CO potential than CO1 potential is about 0.5V, triode Q16 conduction, CO point level through triode Q17 parasitic diode down pull voltage to source, make CO voltage point potential release quickly. When triode Q16 conduction, triode Q17 drain voltage from low potential to high level, therefore triode Q17 also conduction, quickly CO1 voltage release quickly, reach the effect of acceleration. When MOS tube U2 from normal work to close, need to close MOS tube time control in the extremely short range, in which triode Q16 and triode Q17 is used as acceleration, can synchronous pull down CO and CO1 potential, can play the role of protection MOS tube, prevent the power off when working and cause MOS tube breakdown phenomenon.

[0029] Although only some parts and embodiments of the present application have been illustrated and described, many modifications and changes can be made by those skilled in the art without departing from the scope and spirit of the claims, for example: changes in the size, dimension, structure, shape and proportion of each element, mounting arrangement, material use, color, orientation, etc.

[0030] The above-mentioned embodiments are only preferred embodiment modes of the embodiments of the present application, and cannot be used to limit the scope of protection of the embodiments of the present application. Any non-essential changes and substitutions made by those skilled in the art on the basis of the embodiments of the present application are within the scope of protection of the embodiments of the present application.

Claims

1. A BMS protection system with high power MOS acceleration circuit, characterized in that, The voltage stabilizing power supply circuit is used for connecting an external power supply and outputting stable direct current to the driving circuit, the driving circuit is connected to an internal power supply pin of the driving control chip and also connected to an input end of the accelerating circuit.

2. The BMS protection system of claim 1, wherein, The accelerating circuit comprises a diode D11, a voltage stabilizing tube ZD6, a triode Q16, a triode Q17, a resistor R33, a resistor R59, a resistor R60, a resistor R61, a resistor R62 and a MOS tube U2, a drain of the MOS tube U2 is connected to an overvoltage protection pin of the driving control chip, a source of the MOS tube U2 is respectively connected to a positive pole of the voltage stabilizing tube ZD6, one end of the resistor R61, one end of the resistor R62, an emitter of the triode Q17, one end of the resistor R60 and an external battery pack, a gate of the MOS tube U2 is connected to one end of the resistor R33, the other end of the resistor R33, a negative pole of the voltage stabilizing tube ZD6 and the other end of the resistor R61 are all connected to one end of the resistor R59, the other end of the resistor R59 and a negative pole of the diode D11 are all connected to an emitter of the triode Q16, a collector of the triode Q16 and the other end of the resistor R62 are all connected to a base of the triode Q17, a positive pole of the diode D11, a base of the triode Q16, a collector of the triode Q17 and the other end of the resistor R60 are all connected to the driving circuit.

3. The BMS protection system of claim 2, wherein, The driving circuit comprises a resistor R55, a resistor R56, a resistor R57, a resistor R58, a voltage stabilizing tube ZD5, a diode D9, a diode D10, a MOS tube Q15 and a triode Q14, one end of the resistor R56 is connected to an internal power supply pin of the driving control chip, the other end of the resistor R56, one end of the resistor R58 and a negative pole of the voltage stabilizing tube ZD5 are all connected to a gate of the MOS tube Q15, the other end of the resistor R58 and a positive pole of the voltage stabilizing tube ZD5 are all connected to a source of the MOS tube Q15, a drain of the MOS tube Q15 is connected to a negative pole of the diode D9, a positive pole of the diode D9 is connected to one end of the resistor R57, the other end of the resistor R57 and a base of the triode Q14 are all connected to one end of the resistor R55, the other end of the resistor R55 and an emitter of the triode Q14 are all connected to the voltage stabilizing power supply circuit, a collector of the triode Q14 is connected to a positive pole of the diode D10, a negative pole of the diode D10 is connected to a positive pole of the diode D11.

4. The BMS protection system of claim 3, wherein, The voltage stabilizing power supply circuit comprises a diode D47, a resistor R40, a resistor R41, a triode Q37 and a voltage stabilizing tube ZD16, a positive pole of the diode D47 is connected to an external power supply, a negative pole of the diode D47 is connected to one end of the resistor R41 through the resistor R40, one end of the resistor R41 is also connected to a collector of the triode Q37, an emitter of the triode Q37 outputs direct current, the other end of the resistor R41 and a base of the triode Q37 are all connected to a negative pole of the voltage stabilizing tube ZD16, a positive pole of the voltage stabilizing tube ZD16 is grounded.

5. The BMS protection system of claim 4, wherein, The voltage of the direct current is 12V.

6. The BMS protection system of claim 1, wherein, The model of the driving control chip is AMG8803.

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