Drive circuits, battery management systems, battery systems, electrical energy and electrical consumers

Abstract

This application provides a driving circuit, a battery management system, a battery system, an electrical energy device, and an electrical device, which are connected to a switching transistor module. The switching transistor module includes multiple switching transistors connected in parallel. The driving circuit includes a current mirror module; a first terminal of the current mirror module is used to receive a control signal, a second terminal of the current mirror module is connected to the control terminal of the switching transistor module, and a third terminal of the current mirror module is grounded. The current mirror module is used to conduct when the control signal is the turn-off signal of the switching transistor module, thereby discharging the parasitic capacitance of the switching transistor module. This application uses the current mirror module as a discharge circuit for the switching transistor module, quickly discharging the charge of the parasitic capacitance of the switching transistor module, accelerating the turn-off of the switching transistors, avoiding slow turn-off that could cause the switching transistors to burn out, and thus ensuring battery safety.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and in particular to a drive circuit, a battery management system, a battery system, an electrical power device, and an electrical appliance. Background Technology

[0002] High-power batteries need to carry a large current during charging and discharging, but the current capacity of a single MOSFET is limited and cannot meet the demand for high current.

[0003] Therefore, the current amplification effect is achieved by connecting multiple MOSFETs in parallel. However, connecting multiple MOSFETs in parallel will increase the parasitic capacitance of the MOSFET gate, making it more difficult to discharge charge when the MOSFET is turned off. Slow MOSFET turn-off will cause the MOSFET to burn out easily, and may even threaten battery safety. For example, when the battery has a short circuit fault, the MOSFET needs to be turned off in a very short time. Utility Model Content

[0004] This application provides a drive circuit, a battery management system, a battery system, an electrical energy device, and an electrical device to achieve the effect of quickly turning off the switching transistor module.

[0005] In a first aspect, embodiments of this application provide a driving circuit connected to a switching transistor module, wherein the switching transistor module includes multiple switching transistors connected in parallel, and the driving circuit includes: a mirror current source module;

[0006] The first terminal of the current mirror module is used to receive the control signal, the second terminal of the current mirror module is connected to the control terminal of the switching transistor module, and the third terminal of the current mirror module is grounded.

[0007] The mirror current source module is used to turn on when the control signal is the turn-off signal of the switching transistor module, in order to discharge the parasitic capacitance of the switching transistor module.

[0008] In one embodiment, the mirror current source module includes a first mirror branch and a second mirror branch;

[0009] The first end of the first mirror branch is the first end of the mirror current source module, the second end of the first mirror branch is grounded, and the third end of the first mirror branch is connected to the third end of the second mirror branch.

[0010] The first end of the second mirror branch is the second end of the mirror current source module, and the second end of the second mirror branch is grounded.

[0011] The first mirror branch is used to conduct when the control signal is off, generating a mirror current; the second mirror branch is used to discharge the parasitic capacitance of the switching transistor module through the mirror current.

[0012] In one embodiment, the mirror current source module includes: a switching submodule and a first power supply module;

[0013] The first terminal of the first power supply module is the first terminal of the mirror current source module. The first terminal of the first power supply module is connected to the first terminal of the switch submodule. The second terminal of the first power supply module is grounded.

[0014] The second terminal of the switch submodule is connected to the first terminal of the mirror current source module, and the third terminal of the switch submodule is used to receive the control signal; the switch submodule is used to turn on when the control signal is the off signal.

[0015] In one embodiment, the first mirror branch includes a first switching transistor and a first resistor, and the second mirror branch includes a second switching transistor;

[0016] The first end of the first resistor is the first end of the first mirror branch, and the second end of the first resistor is connected to the first end of the first switching transistor.

[0017] The second terminal of the first switching transistor is grounded, and the third terminal of the first switching transistor is connected to the third terminal of the second switching transistor.

[0018] The first terminal of the second switch is connected to the switch module, and the second terminal of the second switch is grounded.

[0019] In one embodiment, the first power supply module includes a first diode and a first capacitor, and the switching submodule includes a third switching transistor;

[0020] The anode of the first diode is connected to the first terminal of the first power supply module, the cathode of the first diode is connected to the first terminal of the first capacitor, and the second terminal of the first capacitor is grounded.

[0021] The first terminal of the third switch is connected to the first terminal of the first capacitor, the second terminal of the third switch is the second terminal of the switch submodule, and the third terminal of the third switch is the third terminal of the switch submodule.

[0022] In one embodiment, the mirror current source module further includes an anti-reverse current sub-module, the first end of which is connected to the first end of the first mirror branch, and the second end of which is connected to the second end of the second mirror branch.

[0023] In one embodiment, the drive circuit further includes a push-pull module;

[0024] The first end of the push-pull module is used to receive control signals; the second end of the push-pull module is connected to the first end of the mirror current source module and the switching transistor module; the third end of the push-pull module is connected to the first power supply; and the fourth end of the push-pull module is grounded.

[0025] In one embodiment, the push-pull module includes a fourth switch and a fifth switch;

[0026] The first terminal of the fourth switch is connected to the first power supply, the second terminal of the fourth switch is connected to the first terminal of the fifth switch, and the third terminal of the fourth switch is connected to the third terminal of the fifth switch.

[0027] The third terminal of the fourth switch is the first terminal of the push-pull module, and the second terminal of the fourth switch is the second terminal of the push-pull module; the second terminal of the fifth switch is grounded.

[0028] In one embodiment, the push-pull module further includes a current-limiting resistor and a second capacitor;

[0029] The first end of the current-limiting resistor is used to connect the control signal, and the second end of the current-limiting resistor is connected to the third end of the fourth switch and the third end of the fifth switch.

[0030] The second capacitor is connected in parallel across the current-limiting resistor.

[0031] Secondly, embodiments of this application provide a battery management system, including a switching transistor module, a control unit, and any of the aforementioned drive circuits.

[0032] Thirdly, embodiments of this application provide a battery system, including the battery management system described above.

[0033] Fourthly, embodiments of this application provide an electrical power device, including the battery system described above.

[0034] Fifthly, embodiments of this application provide an electrical device including the battery system described above.

[0035] This application provides a driving circuit, a battery management system, a battery system, an electrical energy device, and an electrical device, which are connected to a switching transistor module. The switching transistor module includes multiple switching transistors connected in parallel. The driving circuit includes a current mirror module; a first terminal of the current mirror module is used to receive a control signal, a second terminal of the current mirror module is connected to the control terminal of the switching transistor module, and a third terminal of the current mirror module is grounded. The current mirror module is used to conduct when the control signal is the turn-off signal of the switching transistor module, thereby discharging the parasitic capacitance of the switching transistor module. This application uses the current mirror module as a discharge circuit for the switching transistor module, quickly discharging the charge of the parasitic capacitance of the switching transistor module, accelerating the turn-off of the switching transistors, avoiding slow turn-off that could cause the switching transistors to burn out, and thus ensuring battery safety. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0037] Figure 1This is a schematic diagram of the structure of a battery management system provided in one embodiment of this application;

[0038] Figure 2 This is a schematic diagram of the structure of a driving circuit provided in an embodiment of this application;

[0039] Figure 3 This is a schematic diagram of the structure of a switching transistor module provided in an embodiment of this application;

[0040] Figure 4 This is a schematic diagram of the structure of a mirror current source module provided in an embodiment of this application;

[0041] Figure 5 This is a schematic diagram of the structure of a driving circuit provided in an embodiment of this application;

[0042] Figure 6 This is a schematic diagram of the direct drive circuit.

[0043] Figure 7 To adopt Figure 6 Waveform diagram of gate capacitor discharge in the circuit;

[0044] Figure 8 A schematic diagram of the circuit structure driven by a push-pull module;

[0045] Figure 9 To adopt Figure 8 Waveform diagram of gate capacitor discharge in the circuit;

[0046] Figure 10 The waveform diagram of gate capacitor discharge for using the driving circuit of this application.

[0047] Figure label:

[0048] 100, Control unit; 200, Drive circuit; 300, Switching transistor module; 210, Mirror current source module; Q1, First switching transistor; Q2, Second switching transistor; Q3, Third switching transistor; Q4, Fourth switching transistor; Q5, Fifth switching transistor; C1, First capacitor; C2, Second capacitor; C3, Third capacitor; R1, First resistor; R2, Second resistor; R3, Third resistor; R4, Fourth resistor; R5, Fifth resistor; R6, Sixth resistor; D1, First diode; D2, Second diode.

[0049] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0050] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0051] Current technology: High-power batteries need to carry large currents during charging and discharging. The current capacity of a single MOSFET is limited and cannot meet the high current requirements. Therefore, multiple MOSFETs are currently connected in parallel to achieve current amplification. However, connecting multiple MOSFETs in parallel increases the parasitic capacitance of the MOSFET gate, making it more difficult to discharge charge when the MOSFET is turned off. Slow MOSFET turn-off can easily lead to MOSFET burnout and even threaten battery safety, for example, when a battery short-circuit fault occurs, the MOSFET needs to be turned off in a very short time. In order to respond to the control logic, the MOSFET needs to be turned off quickly. Current technology usually uses diodes or PNP transistors to accelerate the turn-off of the MOSFET. However, in the case of multiple MOSFETs connected in parallel, the gate capacitance of the MOSFET is very large. When the capacitor discharges, the voltage drops, which in turn leads to a decrease in discharge current. The discharge current affects the discharge time of the gate capacitance.

[0052] Disadvantages: Existing solutions cannot quickly discharge the gate capacitance of the MOSFET to enable it to turn off quickly.

[0053] To overcome the shortcomings of existing technologies, the inventors of this solution, through creative research, designed a new approach. This solution provides a drive circuit to address the problem of insufficient fast turn-off when multiple switching transistors are connected in parallel. The specific application scenario for this application is handling high current and high power applications, such as battery management systems. Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a battery management system provided in one embodiment of this application. The battery management system includes a control unit 100, a drive circuit 200, and a switching transistor module 300. The control unit 100 is connected to the switching transistor module 300 through the drive circuit 200 and is used to control the switching transistor module 300 to turn on and off. It can also be applied to other high-current scenarios. This application will use the application in the battery management system as an example for explanation.

[0054] Based on the above scenarios, it can be seen that the existing technology has a technical problem where the MOSFET cannot be turned off quickly.

[0055] The driving circuit provided in this application uses a mirror current source module as a discharge circuit for the switching transistor module to quickly discharge the charge of the parasitic capacitance of the switching transistor module, accelerate the turn-off of the switching transistor, avoid the burning out of the switching transistor due to slow turn-off, and thus ensure battery safety.

[0056] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0057] like Figure 2 As shown, Figure 2 This is a schematic diagram of a driving circuit provided in an embodiment of this application. The driving circuit 200 is connected to a switching transistor module 300, wherein the switching transistor module 300 includes multiple switching transistors connected in parallel. The driving circuit 200 includes: a current mirror module 210; a first terminal of the current mirror module 210 is used to receive a control signal, a second terminal of the current mirror module 210 is connected to the control terminal of the switching transistor module 300, and a third terminal of the current mirror module 210 is grounded; the current mirror module 210 is used to conduct when the control signal is the turn-off signal of the switching transistor module 300, so as to discharge the parasitic capacitance of the switching transistor module 300.

[0058] Specifically, when the control signal is the turn-on signal of the switching module 300, the switching transistor in the switching module 300 is turned on, and at this time, the mirror current source module 210 is in the off state; when the control signal is the turn-off signal of the switching module 300, the mirror current source module 210 is turned on, and the control terminal of the switching module 300 and the mirror current source module 210 form a discharge circuit. The discharge time constant during the parasitic capacitor discharge process is used to describe this: τ = RC represents the time required for the capacitor to discharge to 63.2% of its termination voltage. If it is completely discharged, it usually takes 5τ time. The mirror current source module 210 used in this application can generate a constant current, which greatly shortens the discharge time of the parasitic capacitor and accelerates the turn-off of the switching transistor in the switching module 300. This application uses a mirror current source module 210 as the discharge circuit for the switching transistor module 300. The mirror current source module 210 keeps the discharge device current of the switching transistor module 300 constant, which greatly shortens the discharge time of the switching transistor. Therefore, it can quickly discharge the charge of the parasitic capacitance of the switching transistor module 300, accelerate the turn-off of the switching transistor, avoid the burning out of the switching transistor due to slow turn-off, and thus ensure battery safety. Secondly, the circuit structure of this application is simple, has no special requirements for device parameters, does not consume the static current of the switching transistor, and does not require changes to the control logic of the switching transistor.

[0059] In one embodiment, the switching transistor in the switching transistor module 300 can be one of MOSFET, bipolar junction transistor (BJT), insulated gate bipolar transistor (IGBT), silicon carbide MOSFET, and gallium nitride high electron mobility transistor (GaN HEMT). The type of switching transistor in the switching transistor module 300 can be determined according to the actual situation, and this application does not limit it.

[0060] This application uses an NMOS transistor as an example to illustrate the logic of the drive circuit 200. For example... Figure 3 As shown, Figure 3 This is a schematic diagram of a switching module 300 provided in one embodiment of this application. The gate, source, and drain of the MOS transistors in the switching module 300 are connected together to form a parallel circuit. This example illustrates a parallel connection of three NMOS transistors. A gate drive resistor is also connected to the gate of each NMOS transistor to prevent parasitic oscillations and provide damping. A pull-down resistor is also connected between the gate and drain of the MOS transistor to prevent mis-conduction of the MOS transistor when the driver IC is damaged and open-circuited. The number of NMOS transistors connected in parallel can be selected according to actual needs; this application does not limit this selection.

[0061] In one embodiment, the mirror current source module 210 includes a first mirror branch and a second mirror branch; the first end of the first mirror branch is the first end of the mirror current source module 210, the second end of the first mirror branch is grounded, and the third end of the first mirror branch is connected to the third end of the second mirror branch; the first end of the second mirror branch is the second end of the mirror current source module 210, and the second end of the second mirror branch is grounded; the first mirror branch is used to conduct when the control signal is a turn-off signal to generate a mirror current; the second mirror branch is used to discharge the parasitic capacitance of the switching transistor module 300 through the mirror current.

[0062] In one embodiment, such as Figure 4 As shown, Figure 4 This is a schematic diagram of a current mirror module provided in an embodiment of this application. The first mirror branch includes a first switch Q1 and a first resistor R1, and the second mirror branch includes a second switch Q2. The first end of the first resistor R1 is the first end of the first mirror branch, and the second end of the first resistor R1 is connected to the first end of the first switch Q1. The second end of the first switch Q1 is grounded, and the third end of the first switch Q1 is connected to the third end of the second switch Q2. The first end of the second switch Q2 is connected to the switch module 300, and the second end of the second switch Q2 is grounded.

[0063] Specifically, in this example, the first switch Q1 and the second switch Q2 are two NPN transistors with identical characteristics. In other examples, the first switch Q1 and the second switch Q2 can be other types of switches, which are not limited here. Because the U of the first switch Q1... CE1 =U BE1 This ensures that the first switch Q1 always operates in the amplification state and never reaches saturation. Therefore, the collector current I of the first switch Q1... C1 =β*I B1 Since the bases of the first switch Q1 and the second switch Q2 are connected, then U BE1 =U BE2 Therefore I B1 =I B2 Since the two transistors have the same β, then I C2 =β*I B2 =β*I B1 =I C1 As can be seen, due to the special structure of the circuit, I C2 =I C1 :

[0064]

[0065] Therefore, we can conclude that:

[0066]

[0067] When β >> 2:

[0068]

[0069] Due to the mirror principle, the final current flowing through the second switch Q2 is:

[0070]

[0071] It can be seen that the discharge current I C2 The discharge current of the current mirror module 210 is independent of the load and the power supply voltage at the load terminal (switching transistor module 300), and will not change due to a decrease in voltage across the capacitor. Secondly, the discharge process of the parasitic capacitor in the switching transistor module 300 is not limited by a time constant. By configuring different values ​​of the first resistor R1, the current magnitude of the current mirror module 210 can be changed, thereby controlling the turn-off time of the switching transistor module 300. The drive circuit 200 of this application is faster than conventional PNP transistor discharge circuits and push-pull drives, and has a smaller impact compared to negative voltage drives.

[0072] In one embodiment, such as Figure 5 As shown, Figure 5This is a schematic diagram of the drive circuit provided in an embodiment of this application. The mirror current source module 210 includes: a switch submodule and a first power supply module; the first terminal of the first power supply module is the first terminal of the mirror current source module 210, the first terminal of the first power supply module is connected to the first terminal of the switch submodule, and the second terminal of the first power supply module is grounded; the second terminal of the switch submodule is connected to the first terminal of the mirror current source module 210, and the third terminal of the switch submodule is used to receive a control signal; the switch submodule is used to turn on when the control signal is a turn-off signal.

[0073] In one embodiment, the first power supply module includes a first diode D1 and a first capacitor C1, and the switching submodule includes a third switch Q3; the anode of the first diode D1 is the first terminal of the first power supply module, the cathode of the first diode D1 is connected to the first terminal of the first capacitor C1, and the second terminal of the first capacitor C1 is grounded; the first terminal of the third switch Q3 is connected to the first terminal of the first capacitor C1, the second terminal of the third switch Q3 is the second terminal of the switching submodule, and the third terminal of the third switch Q3 is the third terminal of the switching submodule.

[0074] Specifically, when the control signal is the turn-on signal for the switching module 300, the switching module 300 is turned on, and the first power supply charges the first capacitor C1 through the first diode D1. At this time, the gate voltage of the third switching transistor Q3 is greater than or equal to the source voltage, and the third switching transistor Q3 is in the off state, so the current mirror module 210 generates no current. When the control signal is the turn-off signal for the switching module 300, the gate voltage of the third switching transistor Q3 begins to decrease, causing the third switching transistor Q3 to turn on. The first capacitor C1 supplies power to the current mirror module 210, and discharges through the first resistor R1 and the first switching transistor Q1. The current across the first resistor R1 is... Due to the circuit logic of the mirror current source module 210, the second switching transistor Q2 also generates a current of the same magnitude. This current can quickly discharge the charge of the parasitic capacitance on the switching transistor module 300, thereby achieving rapid turn-off of the switching transistor module 300. Figure 5 The third capacitor C3 is the equivalent capacitance of the parasitic capacitance on the switching transistor module 300.

[0075] In one embodiment, the drive circuit 200 further includes a push-pull module; the first end of the push-pull module is used to receive a control signal, the second end of the push-pull module is connected to the first end of the mirror current source module 210 and the switching transistor module 300; the third end of the push-pull module is connected to the first power supply, and the fourth end of the push-pull module is grounded.

[0076] In one embodiment, please refer to Figure 5The mirror current source module 210 also includes an anti-reverse current sub-module, the first end of which is connected to the first end of the first mirror branch, and the second end of which is connected to the second end of the second mirror branch.

[0077] Specifically, the anti-reverse current submodule can be the second diode D2, used to block the reverse loop of the gate voltage when the switching module 300 is turned off; secondly, the push-pull module can also control only the third switching transistor Q3, which can greatly improve the switching speed of the third switching transistor Q3.

[0078] In one embodiment, the push-pull module includes a fourth switch Q4 and a fifth switch Q5; the first end of the fourth switch Q4 is connected to a first power supply, the second end of the fourth switch Q4 is connected to the first end of the fifth switch Q5, and the third end of the fourth switch Q4 is connected to the third end of the fifth switch Q5; the third end of the fourth switch Q4 is the first end of the push-pull module, and the second end of the fourth switch Q4 is the second end of the push-pull module; the second end of the fifth switch Q5 is grounded.

[0079] In one embodiment, the push-pull module further includes a current-limiting resistor and a second capacitor C2; the first end of the current-limiting resistor is used to receive a control signal, and the second end of the current-limiting resistor is connected to the third end of the fourth switch Q4 and the third end of the fifth switch Q5; the second capacitor C2 is connected in parallel across the current-limiting resistor.

[0080] Specifically, please refer to Figure 5 The current-limiting resistor is the second resistor R2, and the fourth switch Q4 is a PMOS; the sixth resistor R6 is a pull-up resistor to ensure the correct gate voltage of the fourth switch Q4, and also to ensure that the push-pull module controls the output of the push-pull module to the correct level when there is no control signal; the fifth switch Q5 is an NPN transistor; the second resistor R2 is the base current-limiting resistor of the push-pull module; the second capacitor C2 is a capacitor used to accelerate the push-pull switching speed.

[0081] When the control signal is high, the fourth switch Q4 is turned on, the push-pull module outputs a high voltage, and the first power supply charges the third capacitor C3 of the switch module 300 through the fourth switch Q4, the second diode D2, and the third resistor R3. When the voltage across the third capacitor C3 is greater than the gate turn-on voltage of the switch module 300, the switch module 300 is turned on. At the same time, the first power supply charges the first capacitor C1 through the fourth switch Q4, the fifth resistor R5, and the first diode D1. At this time, the gate voltage of the third switch Q3 is greater than or equal to the source voltage, the third switch Q3 is in the off state, and the mirror current source module 210 does not work.

[0082] When the control signal is low, the fourth switch Q4 is off and the fifth switch Q5 is on. The push-pull module outputs a low voltage, and the gate voltage of the third switch Q3 begins to drop, causing the third switch Q3 to turn on. The first switch Q1 in the mirror current source module 210 obtains voltage from the first capacitor C1 and discharges through the first resistor R1 and the first switch Q1. Due to the working logic of the mirror current source module 210, the second switch Q2 generates a current of the same magnitude as the first resistor R1. Therefore, the gate of the switch module 300 forms a discharge circuit through the third resistor R3 and the second switch Q2, quickly discharging the charge on the third capacitor C3 and realizing the rapid turn-off of the switch module 300.

[0083] The third resistor R3 is the gate drive resistor, which prevents parasitic oscillations of each NMOS transistor and acts as a damper; the fourth resistor R4 is a pull-down resistor connected between the gate and drain of the MOS transistor, which can prevent the MOS transistor from being mis-turned on when the driver IC is damaged and open-circuited.

[0084] Figure 6 This is a schematic diagram of a direct drive circuit, where the gate capacitor is discharged through a pull-down resistor. Figure 7 To adopt Figure 6 The waveform diagram shows the gate capacitor discharge of the circuit. The third capacitor C3 is 220nF. The input capacitance of the MOSFET used is 13720pF = 13.720nF. When 16 MOSFETs are connected in parallel, the gate capacitance is 13.720 * 16 = 219.52nF, which is close to 220nF. The gate resistor is 10Ω, and the gate pull-down resistor is 1MΩ. The theoretically calculated capacitor discharge time constant is:

[0085] τ=RC=220*10 -9 F * 1000000Ω = 220 * 10 -3 S = 0.22(S)

[0086] If the capacitor is fully discharged, the time is typically: 5τ = 0.22 * 5 = 1.1 (s). Please refer to [link / reference]. Figure 7 The complete discharge time Δx = 1.1s, and the experimentally obtained complete discharge time is in agreement with the theoretical calculation result.

[0087] Figure 8 This is a schematic diagram of a circuit structure driven by a push-pull module. Under the action of the speed-up transistor, the gate-source loop impedance can be minimized for a short time, thereby shortening the discharge time. Figure 9 To adopt Figure 8 The waveform of the gate capacitor discharge in the circuit is shown. The parameters of the switching transistor module 300 are consistent. After adding a push-pull module to the direct drive circuit, the waveform of the third capacitor C3 discharging during the actual turn-off process is shown. Figure 9As shown, channel 1 is the MOS gate voltage, and channel 2 is the control signal for the push-pull circuit. It can be seen that the discharge time has been shortened to 332µs, a significant improvement compared to relying solely on pull-down resistors for discharge.

[0088] Figure 10 The waveform diagram of gate capacitor discharge is shown for using the driving circuit of this application. Figure 10 As shown, channel 1 represents the MOS gate voltage, and channel 2 represents the control signal for the push-pull circuit. It can be seen that discharging through the mirrored current source only requires 9.7µs. Speed ​​improvement:

[0089]

[0090] It is evident that the turn-off speed is increased by more than 100,000 times compared to the undriven circuit. Moreover, the waveform is free from distortion, overshoot, and oscillation; the discharge speed is increased by 34 times compared to the simple push-pull circuit, and the waveform is free from distortion, overshoot, and oscillation.

[0091] This application provides a battery management system; please refer to [link / reference]. Figure 1 The battery management system includes a switching transistor module 300, a control unit 100, and any of the aforementioned drive circuits 200. The control unit 100 is connected to the switching transistor module 300 via the drive circuit 200 and is used to control the switching transistor module 300 to turn on and off.

[0092] In one embodiment, the control unit 100 is a driver IC.

[0093] This application provides a battery system including the battery management system described above.

[0094] This application provides an electrical power device, including the battery system described above.

[0095] This application provides an electrical device including the battery system described above.

[0096] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0097] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0098] In addition, in the various embodiments of this utility model, each functional unit can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0099] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this utility model, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this utility model. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0100] Finally, it should be noted that other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A driving circuit connected to a switching transistor module (300), wherein, The switching transistor module (300) includes a plurality of switching transistors connected in parallel, characterized in that the driving circuit (200) includes: a mirror current source module (210); The first terminal of the current mirror module (210) is used to receive a control signal, the second terminal of the current mirror module (210) is connected to the control terminal of the switching transistor module (300), and the third terminal of the current mirror module (210) is grounded. The mirror current source module (210) is used to turn on when the control signal is the turn-off signal of the switching module (300) to discharge the parasitic capacitance of the switching module (300).

2. The circuit according to claim 1, characterized in that, The mirror current source module (210) includes a first mirror branch and a second mirror branch; The first end of the first mirror branch is the first end of the mirror current source module (210), the second end of the first mirror branch is grounded, and the third end of the first mirror branch is connected to the third end of the second mirror branch. The first end of the second mirror branch is the second end of the mirror current source module (210), and the second end of the second mirror branch is grounded; The first mirror branch is used to conduct when the control signal is a turn-off signal to generate a mirror current; the second mirror branch is used to discharge the parasitic capacitance of the switching transistor module (300) through the mirror current.

3. The circuit according to claim 2, characterized in that, The mirror current source module (210) includes: a switch submodule and a first power supply module; The first terminal of the first power supply module is the first terminal of the mirror current source module (210), the first terminal of the first power supply module is connected to the first terminal of the switch submodule, and the second terminal of the first power supply module is grounded. The second end of the switch submodule is connected to the first end of the mirror current source module (210), and the third end of the switch submodule is used to receive the control signal; the switch submodule is used to turn on when the control signal is a turn-off signal.

4. The circuit according to claim 2, characterized in that, The first mirror branch includes a first switch (Q1) and a first resistor (R1), and the second mirror branch includes a second switch (Q2); The first end of the first resistor (R1) is the first end of the first mirror branch, and the second end of the first resistor (R1) is connected to the first end of the first switch (Q1). The second terminal of the first switch (Q1) is grounded, and the third terminal of the first switch (Q1) is connected to the third terminal of the second switch (Q2). The first end of the second switch (Q2) is connected to the switch module (300), and the second end of the second switch (Q2) is grounded.

5. The circuit according to claim 3, characterized in that, The first power supply module includes a first diode (D1) and a first capacitor (C1), and the switching submodule includes a third switching transistor (Q3); The anode of the first diode (D1) is the first terminal of the first power supply module, the cathode of the first diode (D1) is connected to the first terminal of the first capacitor (C1), and the second terminal of the first capacitor (C1) is grounded. The first terminal of the third switch (Q3) is connected to the first terminal of the first capacitor (C1), the second terminal of the third switch (Q3) is the second terminal of the switch submodule, and the third terminal of the third switch (Q3) is the third terminal of the switch submodule.

6. The circuit according to claim 2, characterized in that, The mirror current source module (210) further includes an anti-reverse current sub-module, the first end of which is connected to the first end of the first mirror branch, and the second end of which is connected to the second end of the second mirror branch.

7. The circuit according to claim 1, characterized in that, The drive circuit (200) also includes a push-pull module; The first end of the push-pull module is used to receive control signals, the second end of the push-pull module is connected to the first end of the mirror current source module (210) and the switching transistor module (300); the third end of the push-pull module is connected to the first power supply, and the fourth end of the push-pull module is grounded.

8. The circuit according to claim 7, characterized in that, The push-pull module includes a fourth switch (Q4) and a fifth switch (Q5); The first terminal of the fourth switch (Q4) is connected to the first power supply, the second terminal of the fourth switch (Q4) is connected to the first terminal of the fifth switch (Q5), and the third terminal of the fourth switch (Q4) is connected to the third terminal of the fifth switch (Q5). The third terminal of the fourth switch (Q4) is the first terminal of the push-pull module, and the second terminal of the fourth switch (Q4) is the second terminal of the push-pull module; the second terminal of the fifth switch (Q5) is grounded.

9. The circuit according to claim 8, characterized in that, The push-pull module also includes a current-limiting resistor and a second capacitor (C2); The first end of the current-limiting resistor is used to receive the control signal, and the second end of the current-limiting resistor is connected to the third end of the fourth switch (Q4) and the third end of the fifth switch (Q5). The second capacitor (C2) is connected in parallel across the current-limiting resistor.

10. A battery management system, characterized in that, It includes a switching transistor module (300), a control unit (100), and a drive circuit (200) as described in any one of claims 1-9.

11. A battery system, characterized in that, Includes the battery management system as described in claim 10.

12. An electrical energy device, characterized in that, Includes the battery system as described in claim 11.

13. An electrical appliance, characterized in that, Includes the battery system as described in claim 11.

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