Driving circuit and electric device

Abstract

A driving circuit (10) and an electric device (100). The driving circuit (10) comprises a driving module (11) connected to a driving end of an active fuse (20) and used for providing a constant current and a constant voltage. The active fuse (20) melts under the driving of the constant current, and is connected under the driving of the constant voltage. The problem in the related art of switching devices (Q2, Q3) being prone to burn out or erroneous detection of the state of the active fuse (20) can be solved.

Description

Drive circuit and electrical device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202322393198.1, filed on September 4, 2023, entitled “Driving Circuit and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of active fuse control, and in particular to a drive circuit and an electrical device. Background Art

[0004] With the development of new energy technologies, new energy vehicles are gradually being commercialized in the market, and electric vehicles are the main force of new energy vehicles. Electric vehicles are being vigorously promoted and applied in the market.

[0005] In electric vehicles, active fuses are typically installed in the high-voltage circuit. These fuses are connected to the drive source via a switching device. In the event of an emergency, such as a collision with an electrical device, the switching device can be turned on, and the driving voltage provided by the drive source can be used to blow the active fuse.

[0006] However, there are problems in the related art that the switching device may be easily burned or the active fuse status may be misdetected.

[0007] Summary of the Invention

[0008] The present application provides a driving circuit and an electrical device, which can solve the problem in the related art that the switching device is easily burned out or the active fuse status is misdetected.

[0009] In a first aspect, the present application provides a driving circuit, including a driving module connected to a driving end of an active fuse, for providing a constant current and a constant voltage, wherein the constant current is used to blow the active fuse, and the constant voltage is used to drive the active fuse to conduct.

[0010] According to the driving circuit provided in the embodiment of the present application, since the driving module can be used to provide constant current and constant voltage, when it is necessary to blow the active fuse, the driving module can be used to provide a constant current to blow the active fuse. Since the current is constant, it can be avoided that the switching device connected to the driving end of the active fuse is burned due to excessive current; when it is necessary to detect the status of the active fuse, the driving module can be used to provide a constant voltage to drive the active fuse. Since the voltage is constant, the signal collected during the status detection is also relatively accurate, thereby improving the accuracy of the active fuse status detection.

[0011] In a possible implementation of the first aspect, the driving module includes a first driving submodule and a second driving submodule, and the active fuse circuit further includes a first switch module;

[0012] The first driving submodule is connected to the driving end of the active fuse and is used to provide a constant voltage;

[0013] The second driving submodule is connected to the first driving submodule through the first switch module and is connected to the driving end of the active fuse. When the first switch module is turned on, the second driving submodule is used to provide a constant current according to a constant voltage.

[0014] In a possible implementation of the first aspect, the driving circuit further includes: a current limiting module, and the constant voltage provided by the driving module is transmitted to the driving end of the active fuse through the current limiting module.

[0015] In a possible implementation of the first aspect, the driving circuit further includes: a control module connected to the first switch module and configured to control the on and off of the first switch module.

[0016] In a possible implementation of the first aspect, the control module is also connected to the first driving end and the second driving end of the active fuse. The control module is also used to collect the first voltage of the first driving end and the second voltage of the second driving end when the first switch module is turned off, and determine the state of the active fuse based on the first voltage and the second voltage.

[0017] In a possible implementation of the first aspect, a current limiting module is connected between the first driver submodule and the first driver end of the active fuse; the control module is used to determine the current flowing through the active fuse based on the voltage value of the constant voltage, the first voltage, and the resistance value of the current limiting module; determine the resistance value of the active fuse circuit based on the first voltage, the second voltage, and the current flowing through the active fuse; and determine the state of the active fuse based on the resistance value of the active fuse circuit.

[0018] In a possible implementation of the first aspect, the driving circuit further includes: a unidirectional conduction module connected between the driving module and the power supply.

[0019] In a possible implementation of the first aspect, the first switch module includes a first switch, a first end of the first switch is connected to the output end of the first driver submodule, a second end of the first switch is connected to the input end of the second driver submodule, and a control end of the first switch is connected to the control module.

[0020] In a possible implementation of the first aspect, the first driver submodule includes a first inductor, a first diode, a first capacitor, and a fourth switch;

[0021] A first end of the first inductor is connected to a power supply, and a second end of the first inductor is connected to a first end of the first switch and an anode of the first diode;

[0022] A second terminal of the fourth switch is grounded, and a control terminal of the fourth switch is connected to the first control signal;

[0023] The cathode of the first diode is connected to the first electrode of the first capacitor;

[0024] A first electrode of the first capacitor is connected to a driving end of the active fuse, and a second electrode of the first capacitor is grounded.

[0025] In a possible implementation of the first aspect, the second driving submodule includes a driving control submodule, a fifth switch, a second inductor, a second capacitor, and a sampling resistor;

[0026] The input end of the driving control submodule is connected to the output end of the first driving submodule through the first switch module;

[0027] A first end of the second inductor is connected to the first control end of the drive control submodule and the first end of the fifth switch, and a second end of the second inductor is connected to the first electrode of the second capacitor and the first end of the sampling resistor;

[0028] The second end of the fifth switch is grounded, and the control end of the fifth switch is connected to the second control signal;

[0029] The second electrode of the second capacitor is grounded;

[0030] A first end of the sampling resistor is connected to a first feedback signal end of the drive control submodule, and a second end of the sampling resistor is connected to a second feedback signal end of the drive control submodule and a drive end of the active fuse.

[0031] In a possible implementation of the first aspect, the current limiting module includes a first resistor.

[0032] In a possible implementation of the first aspect, the unidirectional conduction module includes a second diode, an anode of the second diode is connected to the power supply, and a cathode of the second diode is connected to the input end of the driving module.

[0033] Based on the same inventive concept, in a second aspect, an embodiment of the present application provides an electrical device, comprising an active fuse and a driving circuit as described in any embodiment of the first aspect.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0036] FIG1 is a schematic structural diagram of a driving circuit according to an embodiment of the present application;

[0037] FIG2 is a schematic structural diagram of a driving circuit according to another embodiment of the present application;

[0038] FIG3 is a schematic structural diagram of a driving circuit according to another embodiment of the present application;

[0039] FIG4 is a schematic structural diagram of a driving circuit according to another embodiment of the present application;

[0040] FIG5 is a schematic structural diagram of a driving circuit according to another embodiment of the present application;

[0041] FIG6 is a schematic structural diagram of a driving circuit according to another embodiment of the present application;

[0042] FIG7 is a schematic structural diagram of a driving circuit according to another embodiment of the present application;

[0043] FIG8 is a schematic structural diagram of a driving circuit according to another embodiment of the present application;

[0044] FIG9 is a schematic structural diagram of a driving circuit according to another embodiment of the present application;

[0045] FIG10 is a schematic structural diagram of a driving circuit according to another embodiment of the present application;

[0046] FIG11 is a schematic diagram of a module structure of an electric device according to an embodiment of the present application.

[0047] In the accompanying drawings, the drawings are not necessarily drawn to scale.

[0048] In the accompanying drawings: 10, driving circuit; 11, driving module; 111, first driving submodule; 112, second driving submodule; 1121, driving control submodule; 12, first switching module; 13, current limiting module; 14, control module; 15, unidirectional conduction module; 100, electrical device. DETAILED DESCRIPTION

[0049] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0050] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification and description of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the accompanying drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects, not to describe a specific order or a primary-secondary relationship.

[0051] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0052] As described in the background art, there are problems in the related art that may easily cause the switch device to be burned or the active fuse status to be misdetected.

[0053] The inventors have studied and analyzed the causes leading to the above technical problems, which are as follows:

[0054] Since the impedance of the active fuse is small, a large current will flow when the switch device connected to the active fuse is closed, which may cause the switch device to burn out and lead to the problem of being unable to drive the active fuse to melt.

[0055] Due to the instability of the driving source connected to the switching device, the voltage output by the driving source varies, and there is even a large voltage fluctuation range. For example, if the driving source is a KL30 power supply, the output voltage of the KL30 power supply may vary from 12V to 18V, 24V, etc., resulting in a greater risk of inaccurate detection of the active fuse status, and therefore there is a problem of false detection.

[0056] In order to solve the above technical problems, the embodiments of the present application provide a driving circuit and an electrical device. The driving circuit and the electrical device provided in the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0057] The following first introduces the driving circuit provided by the application embodiment.

[0058] FIG1 is a schematic diagram of a driving circuit according to an embodiment of the present application. As shown in FIG1 , the driving circuit 10 may include a driving module 11 .

[0059] The driving module 11 is connected to the driving end of the active fuse 20 and can be used to provide at least one of a constant current and a constant voltage. The constant current can be used to melt the active fuse 20 , and the constant voltage can be used to drive the active fuse 20 to conduct.

[0060] Figure 1 illustrates the case where the active fuse 20 is connected in series with the positive and negative electrodes of the high-voltage circuit. In other examples, the active fuse 20 can also be connected in series between battery cells in the battery pack to prevent self-short circuits in the battery pack when the active fuse 20 blows.

[0061] In some embodiments of the present application, an active fuse may utilize gunpowder as the power source for its mechanical structure. By applying a driving voltage or current to the two driving ends of the active fuse, a relatively large input current is generated at the driving ends of the active fuse, triggering the explosion of the gunpowder and thus actively opening the fuse. However, this embodiment does not impose any limitations on the actual structure of the active fuse 20; any fuse in the prior art that can be triggered by a relatively large input current may be used in this embodiment.

[0062] The active fuse 20 can be blown within a certain range of melting current. In the embodiment of the present application, the active fuse 20 can be blown when driven by a constant current provided by the driver module 11, and can be turned on when driven by a constant voltage provided by the driver module 11. It is understood that when the constant current provided by the driver module 11 is within the melting current range, and when the constant voltage provided by the driver module 11 drives the active fuse 20, the current in the active fuse 20 is less than the minimum current within the melting current range.

[0063] For example, the fusing current range of the active fuse 20 is [1.2 A, 1.75 A], and the constant current provided by the driver module 11 may be between [1.2 A, 1.75 A]. When the constant voltage provided by the driver module 11 drives the active fuse 20, the current in the active fuse 20 may be less than 1.2 A. For example, when the constant voltage provided by the driver module 11 drives the active fuse 20, the current in the active fuse 20 may be less than or equal to 100 mA.

[0064] For example, at least one driving end of the active fuse 20 may be connected to a switching device. When the switching device is turned on, the constant current or constant voltage provided by the driving module 11 may be transmitted to the active fuse 20 .

[0065] As an example, in Figure 1 , the first driving terminal of the active fuse 20 is connected to the second switching device Q2, and the second driving terminal of the active fuse 20 is connected to the third switching device Q3. The driving module 11 is connected to the first driving terminal of the active fuse 20 via the second switching device Q2. The second driving terminal of the active fuse 20 is grounded via the third switching device Q3. The control terminals of the second and third switching devices Q2 and Q3 can be connected to a control module (not shown in Figure 1 ).

[0066] It should be noted that while this embodiment includes two switching devices Q2 and Q3, other embodiments may include only one switching device, such as only the second switching device Q2 or only the third switching device Q3. This embodiment does not limit the number of switching devices, as long as they can control the continuity between the driver module 11, the active fuse 20, and the ground.

[0067] It is understandable that the active fuse needs to be blown in the event of an emergency, such as a vehicle collision, so it is particularly important to diagnose the status of the active fuse.

[0068] According to the driving circuit 10 provided in the embodiment of the present application, since the driving module 11 can be used to provide at least one of a constant current and a constant voltage, when the active fuse needs to be blown, the driving module 11 can be used to provide a constant current to blow the active fuse 20. Since the current is constant, it can be avoided that the switching device connected to the driving end of the active fuse 20 is burned due to excessive current; when the active fuse status needs to be detected, the driving module 11 can be used to provide a constant voltage to drive the active fuse 20. Since the voltage is constant, the signal collected during the status detection is also relatively accurate, thereby improving the accuracy of the active fuse status detection.

[0069] It should be noted that the driving module 11 can be used to provide at least one of a constant current and a constant voltage, and may include: the driving module 11 can be used to provide a constant current, the driving module 11 can be used to provide a constant voltage, and the driving module 11 can be used to provide a constant current and a constant voltage.

[0070] The following is a detailed description of the implementation details of the driving circuit of this embodiment. The following content is only provided for ease of understanding and is not necessary for implementing this solution.

[0071] In some optional embodiments, as shown in FIG. 2 , the driving module 11 includes a first driving submodule 111 and a second driving submodule 112 , and the driving circuit 10 may further include a first switch module 12 .

[0072] The first driver submodule 111 is connected to the driving end of the active fuse 20 to provide a constant voltage. The second driver submodule 112 is connected to the output end of the first driver submodule 111 via the first switch module 12 and is used to provide a constant current according to the constant voltage when the first switch module 12 is turned on.

[0073] In the event of an emergency, such as a vehicle collision, the active fuse needs to be blown. In most cases, the status of the active fuse needs to be monitored. For example, the status of the active fuse needs to be continuously monitored while the vehicle is in motion.

[0074] In the embodiment of the present application, when the first switch module 12 is on, the second driver submodule 112 is used to provide a constant current based on the constant voltage provided by the first driver submodule 111. That is, the second driver submodule 112 is only in an operating state when the first switch module 12 is on, and can be in a non-operating state when the first switch module 12 is off. In this way, when it is necessary to blow the active fuse, the first switch module 12 can be controlled to be on, so that the second driver submodule 112 is in an operating state. Therefore, in most cases, the second driver submodule 112 can be in a non-operating state, which helps reduce power consumption.

[0075] It is understood that because the second driver submodule 112 is connected to the output of the first driver submodule 111 via the first switch module 12, the second driver submodule 112 can use the constant voltage output by the first driver submodule 111 to generate a constant current. The constant voltage supplied to the second driver submodule 112 ensures the constancy of its output current. Furthermore, there is no need to introduce an additional power supply for the second driver submodule 112, which helps simplify the overall circuit structure of the driver circuit.

[0076] In some optional embodiments, as shown in FIG3 , the driving circuit 10 may further include a current limiting module 13. The constant voltage provided by the driving module 11 may be transmitted to the driving end of the active fuse 20 via the current limiting module 13. The constant current provided by the driving module 11 may not necessarily pass through the current limiting module 13 on its way to the active fuse 20.

[0077] For example, the driver module 11 includes a first driver submodule 111 for providing a constant voltage, and the current limiting module 13 can be connected between the output end of the first driver submodule 111 and the driving end of the active fuse 20. The current limiting module 13 does not need to be provided between the output end of the second driver submodule 112 and the driving end of the active fuse 20.

[0078] The current limiting module 13 can be used to limit the magnitude of the current flowing through the active fuse 20 . Driven by the constant voltage provided by the driving module 11 , the current flowing through the active fuse 20 can be limited to a smaller current value to avoid blowing the active fuse 20 .

[0079] In some optional embodiments, as shown in FIG. 4 , the driving circuit 10 may further include a control module 14 . The control module 14 is connected to the first switch module 12 and is configured to control the on / off switching of the first switch module 12 .

[0080] The on / off state of the first switch module 12 is used to control the operating state of the second driver submodule 112. When the control module 14 controls the first switch module 12 to be on, the second driver submodule 112 is in an operating state, generating a constant current and driving the active fuse 20 to melt. When the control module 14 controls the first switch module 12 to be off, the second driver submodule 112 is in an inoperative state, and the first driver submodule 111 generates a constant voltage and drives the active fuse 20.

[0081] For example, the control module 14 may be configured to receive a trigger signal or a monitoring signal. The trigger signal or monitoring signal may be a signal that controls the first switch module 12 to conduct under abnormal circumstances, thereby allowing the second driver submodule 112 to generate a constant current and drive the active fuse 20 to melt. Abnormal circumstances may include situations such as collisions with electrical devices.

[0082] Exemplarily, the control module 14 may be a chip or circuit that performs related actions according to characteristic instructions. For example, the control module 14 may be a microcontroller unit (MCU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. For another example, the control module 14 may include an external clock, random access memory (RAM), read-only memory (ROM), etc. The specific structure of the control module 14 is not limited in this application.

[0083] For example, as shown in FIG4 , the control module 14 may include a first control submodule Ctr1 connected to a control terminal of the first switch module 12 , and configured to output a signal for controlling the on / off of the first switch module 12 .

[0084] The control module 14 may further include a second control submodule Ctr2 and a third control submodule Ctr3. The second control submodule Ctr2 is connected to the control terminal of the second switching device Q2 and is configured to output a signal for controlling the on / off of the second switching device Q2. The third control submodule Ctr3 is connected to the control terminal of the third switching device Q3 and is configured to output a signal for controlling the on / off of the third switching device Q3.

[0085] In some optional embodiments, as shown in Figure 5, the control module 14 is also connected to the first driving end and the second driving end of the active fuse 20. The control module 14 is also used to collect the first voltage V1 of the first driving end and the second voltage V2 of the second driving end when the first switch module 12 is turned off, and determine the state of the active fuse 20 based on the first voltage V1 and the second voltage V2.

[0086] When the first switch module 12 is turned off, the active fuse 20 is driven by the constant voltage provided by the first driver submodule 111. Since the constant voltage is relatively stable, the collected values ​​of the first voltage V1 and the second voltage V2 are relatively accurate, and thus the determined state of the active fuse 20 is also relatively accurate.

[0087] For example, if the first voltage V1 is relatively close to the constant voltage provided by the first driver submodule 111, and the second voltage V2 is relatively close to the ground voltage, the active fuse 20 can be determined to be in a disconnected state (or open circuit state). If the first voltage V1 and the second voltage V2 are equal, the active fuse 20 can be determined to be in a short circuit state. If the difference between the first voltage V1 and the second voltage V2 is close to the voltage drop caused by the resistance of the active fuse 20 circuit, the active fuse 20 can be determined to be in a conductive state.

[0088] The above determination of the state of the active fuse 20 is merely an example and is not intended to limit the present application.

[0089] For example, the control module 14 may include a first signal acquisition submodule ADC1 and a second signal acquisition submodule ADC2. The first signal acquisition submodule ADC1 is connected to the first driving terminal of the active fuse 20 and is configured to acquire a first voltage V1 at the first driving terminal. The second signal acquisition submodule ADC2 is connected to the second driving terminal of the active fuse 20 and is configured to acquire a second voltage V2 at the second driving terminal.

[0090] As described in the above embodiment, the constant voltage provided by the driving module 11 can be transmitted to the driving end of the active fuse 20 through the current limiting module 13 .

[0091] In some optional embodiments, as shown in FIG6 , a current limiting module 13 is connected between the first driver submodule 111 and the first driver end of the active fuse 20. The control module 14 can be specifically configured to determine the current I flowing through the active fuse based on the constant voltage value Vout, the first voltage V1, and the resistance R1 of the current limiting module 13; determine the resistance R of the active fuse circuit based on the first voltage V1, the second voltage V2, and the current I flowing through the active fuse; and determine the state of the active fuse 20 based on the resistance R of the active fuse circuit.

[0092] The active fuse 20 has different resistance values ​​in its circuit under different states. The constant voltage Vout, the first voltage V1, the second voltage V2, and the resistance R1 of the current limiting module 13 provided by the first driver submodule 111 are known. The voltage difference ΔV between the first and second driver terminals of the active fuse 20 is V1-V2. The current flowing through the active fuse 20 is the same as the current flowing through the current limiting module 13, which is I=(Vout-V1) / R1. Consequently, the resistance of the active fuse 20 circuit is R=ΔV / I.

[0093] For example, when the resistance R of the active fuse 20 circuit is less than a first threshold, the active fuse 20 can be considered to be in a short-circuit state; when the resistance R of the active fuse 20 circuit is greater than a second threshold, the active fuse 20 can be considered to be in an open-circuit state; when the resistance R of the active fuse 20 circuit is greater than or equal to the first threshold and less than or equal to the second threshold, the active fuse 20 can be considered to be in a conducting state.

[0094] For example, the first threshold is 1.7Ω and the second threshold is 10Ω. Of course, this is only an example and is not intended to limit the present application. The first and second thresholds can be determined based on the specific structure of the active fuse 20 and the high-voltage circuit in which it is located.

[0095] In some optional embodiments, as shown in FIG. 7 , the driving circuit 10 may further include a unidirectional conduction module 15 , which may be connected between the driving module 11 and the power source KL30 .

[0096] It is understood that the unidirectional conduction module has a directional conduction characteristic. The unidirectional conduction module 15 can allow electrical signals to flow from the power supply KL30 to the driver module 11. The unidirectional conduction module 15 can be used to prevent the electrical signals from the driver module 11 from flowing back into the power supply KL30, thereby improving the stability of the power supply KL30. The electrical signal may include a voltage signal or a current signal.

[0097] For example, when the driving circuit 10 includes the first driving submodule 111 and the second driving submodule 112 , the unidirectional conducting module 15 may be connected between the input terminal of the first driving submodule 111 and the power source KL30 .

[0098] The power supply KL30 is a low-voltage power supply. For example, the power supply KL30 can be used to provide a voltage of about 12V.

[0099] In some optional embodiments, as shown in Figure 8, the first switch module 12 may include a first switch Q1, a first end of the first switch Q1 is connected to the output end of the first driver submodule 111, a second end of the first switch Q1 is connected to the input end of the second driver submodule 112, and a control end of the first switch Q1 is connected to the control module 14.

[0100] And / or, the first driver submodule 111 may include a first inductor L1, a first diode D1, a first capacitor C1, and a fourth switch Q4. A first end of the first inductor L1 is connected to a power source KL30, a second end of the first inductor L1 is connected to a first end of a fourth switch Q4 and an anode of the first diode D1; a second end of the fourth switch Q4 is grounded, and a control end of the fourth switch Q4 is connected to a first control signal; a cathode of the first diode D1 is connected to a first electrode of the first capacitor C1; a first electrode of the first capacitor C1 is connected to a first driving end of the active fuse 20, and a second electrode of the first capacitor C1 is grounded.

[0101] And / or, the second driver submodule 112 includes a driver control submodule 1121, a fifth switch Q5, a second inductor L2, a second capacitor C2, and a sampling resistor R2; an input terminal VIN of the driver control submodule 1121 is connected to the output terminal of the first driver submodule 111 via the first switch Q1; a first end of the second inductor L2 is connected to the first control terminal SW of the driver control submodule 1121 and the first end of the fifth switch Q5, and a second end of the second inductor L2 is connected to the first terminal of the second capacitor C2 and the first end of the sampling resistor R2; a second end of the fifth switch Q5 is grounded, and the control terminal of the fifth switch Q5 is connected to the second control signal; a second terminal of the second capacitor C2 is grounded; a first end of the sampling resistor R2 is connected to the first feedback signal terminal VSEN of the driver control submodule 1121, and a second end of the sampling resistor R2 is connected to the second feedback signal terminal ISEN1 of the driver control submodule 1121 and the driving end of the active fuse 20.

[0102] The first control signal received by the control terminal of the fourth switch Q4 may include a pulse width modulation (PWM) signal. For ease of distinction, the first control signal received by the control terminal of the fourth switch Q4 is denoted as PWM1. The fourth switch Q4 can be controlled to alternately turn on and off, thereby forming a BOOST circuit comprising the first inductor L1, the first diode D1, the first capacitor C1, and the fourth switch Q4.

[0103] The power supply KL30 is a DC power supply. The first end of the first inductor L1 is connected to the power supply KL30. DC power is fed to the first inductor L1. When the fourth switch Q4 is on, it acts as a wire, with current flowing through the first inductor L1, the fourth switch Q4, and then to ground. Because the input is DC power, the current in the first inductor L1 increases linearly at a certain rate. As the current in the first inductor L1 increases, some energy is stored in the first inductor L1. Therefore, when the fourth switch Q4 is on, the first inductor L1 is charged.

[0104] When the fourth switch Q4 is off, the current in the first inductor L1 continues to flow in the same direction due to the current-holding characteristics of the first inductor L1. Since the first switch Q1 is off, the current flows through the first diode D1 and reaches the first electrode of the first capacitor C1. The current in the first inductor L1 gradually increases during energy storage and gradually decreases during energy release. When the current in the first inductor L1 changes from increasing to decreasing, the polarity of the voltage across the first inductor L1 reverses, and the voltage across the first inductor L1 is superimposed on the voltage input from the power supply KL30, thereby completing the boost function.

[0105] For example, the duty cycle of the PWM1 signal can be adjusted to control the ratio between the on-time and off-time of the fourth switch Q4, thereby adjusting the boost factor of the voltage supplied to the power supply KL30. In other words, the output voltage can be adjusted to a constant voltage, thereby enabling the first driver submodule 111 to provide a constant voltage. Different duty cycles of the PWM1 signal can also be understood as different refresh frequencies of the PWM1 signal.

[0106] For example, a BOOST driver chip may be used to output a PWM1 signal to control the fourth switch Q4 to be turned on or off. The present application does not limit the specific structure of the BOOST driver chip.

[0107] The first control terminal SW in the second driver submodule 112 can be used to control the connection between the second inductor L2 and the input terminal VIN of the driver control submodule 1121. The input terminal VIN of the driver control submodule 1121 is connected to the constant voltage output by the first driver submodule 111. The second inductor L2, the fifth switch Q5, and the second capacitor C2 can form a buck circuit.

[0108] When a constant current is required to drive the active fuse 20, the first switch Q1 can be controlled to be turned on, the first control terminal SW controls the second inductor L2 to be conductive with the input terminal VIN of the drive control submodule 1121, and the fifth switch Q5 can be controlled to be turned off, so that the current flows directly to the second inductor L2, charging the second capacitor C2 and providing power to the active fuse 20. Because the current in the second inductor L2 cannot change suddenly, it will hinder the change of current. At this time, the polarity of the first end of the second inductor L2 is positive, and the polarity of the second end of the second inductor L2 is negative, and the current in the second inductor L2 gradually increases. When the voltage output by the Buck step-down circuit reaches a preset voltage threshold, which is less than the constant voltage provided by the first driver submodule 111, the first control terminal SW can control the second inductor L2 to be disconnected from the input terminal VIN of the driver control submodule 1121, and control the fifth switch Q5 to be turned on. At this time, the second inductor L2 induces an opposite voltage to prevent the disappearance of current, and the positive and negative polarities change. At this time, the second inductor L2 is the power supply in the Buck step-down circuit, supplying power to the active fuse 20 through the fifth switch Q5 to form a loop. When the polarity of the second inductor L2 changes, the second capacitor C2 can supply power to the active fuse 20.

[0109] For example, a switch may be connected between the second inductor L2 and the input terminal VIN of the drive control submodule 1121 , and the first control terminal SW may control the on-off of the switch. The first control terminal SW may control the on-off of the switch via a PWM2 signal.

[0110] In addition, the second driver submodule 112 implements feedback regulation through the sampling resistor R2. For example, the voltage across the sampling resistor R2 is collected and the current output by the second driver submodule 112 is calculated based on the voltage across the sampling resistor R2 and the resistance value of the sampling resistor R2. If the current output by the second driver submodule 112 decreases or increases, the duty cycle of the PWM2 signal at the first control terminal SW is adjusted to control the ratio of the on-time to the off-time between the second inductor L2 and the input terminal VIN of the driver control submodule 1121. This adjusts the output current to a constant current, thereby enabling the second driver submodule 112 to provide a constant current. Different duty cycles of the PWM2 signal can also be understood as different refresh frequencies of the PWM2 signal.

[0111] Exemplarily, the drive control submodule 1121 may be a chip or circuit that performs related actions according to characteristic instructions, wherein the chip or circuit may include an external clock, random access memory (RAM), read-only memory (ROM), etc. The specific structure of the drive control submodule 1121 is not limited in this application.

[0112] It should be noted that the specific circuit structures of the first driver submodule 111 and the second driver submodule 112 in the above examples are merely examples and are not intended to limit the present application. In other examples, the first driver submodule 111 and the second driver submodule 112 may also have other structures, as long as the first driver submodule 111 can provide a constant voltage and the second driver submodule 112 can provide a constant current.

[0113] In some optional embodiments, as shown in Figure 9, the current limiting module 13 may include a first resistor R1. It should be noted that the resistance of the first resistor R1 may be set according to the constant voltage provided by the driving module 11 and the current required to be limited.

[0114] It should be noted that all alternative solutions based on the current limiting module 13 including the first resistor R1 are within the protection scope of this application.

[0115] In some optional embodiments, as shown in FIG. 10 , the unidirectional conduction module 15 may include a second diode D2 , wherein the anode of the second diode D2 is connected to the power supply KL30 , and the cathode of the second diode D2 is connected to the input end of the driving module 11 .

[0116] The diode has a unidirectional conduction characteristic, and the second diode D2 is used to achieve unidirectional conduction between the power supply KL30 and the driving module 11, which has a simple structure and low cost. For example, the cathode of the second diode D2 can be connected to the first end of the first inductor L1.

[0117] It should be noted that all alternative solutions based on the unidirectional conducting module 15 including the second diode D2 are within the protection scope of this application.

[0118] Based on the same inventive concept, this application also provides an electrical device. As shown in Figure 11, the electrical device 100 includes an active fuse 20 and a drive circuit 10, wherein the drive circuit includes the drive circuit 10 of any of the above embodiments. It is understood that the electrical device has the beneficial effects of the drive circuit provided in the embodiments of this application. For details, please refer to the detailed description of the drive circuit in the above embodiments, and this embodiment will not be repeated here.

[0119] It should be noted that in the embodiments shown in the above figures, the resistor is represented as a single resistor, and the capacitor is represented as a single capacitor. In other embodiments, the resistor may be an integration of resistors connected in series, in parallel, or in a hybrid configuration, and the capacitor may be an integration of capacitors connected in series, in parallel, or in a hybrid configuration. The specific parameters of each device may be set according to actual needs, and this application does not limit this.

[0120] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0121] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A driving circuit, comprising: The driving module is connected to the driving end of the active fuse and is used to provide a constant current and a constant voltage, wherein the constant current is used to blow the active fuse, and the constant voltage is used to drive the active fuse to conduct.

2. The driving circuit according to claim 1, wherein: The driving module includes a first driving submodule and a second driving submodule, and the driving circuit also includes a first switch module; The first driving submodule is connected to the driving end of the active fuse and is used to provide a constant voltage; The second driving submodule is connected to the first driving submodule through the first switch module and is connected to the driving end of the active fuse, and is used to provide a constant current according to the constant voltage when the first switch module is turned on.

3. The driving circuit according to claim 1, wherein: The driving circuit further includes: A current limiting module, wherein the constant voltage provided by the driving module is transmitted to the driving end of the active fuse through the current limiting module.

4. The driving circuit according to claim 2, wherein: The driving circuit further includes: A control module is connected to the first switch module and is used to control the on and off of the first switch module.

5. The driving circuit according to claim 4, wherein: The control module is also connected to the first driving end and the second driving end of the active fuse. The control module is also used to collect the first voltage of the first driving end and the second voltage of the second driving end when the first switch module is turned off, and determine the state of the active fuse according to the first voltage and the second voltage.

6. The driving circuit according to claim 5, wherein: A current limiting module is connected between the first driving submodule and the first driving end of the active fuse; The control module is used to determine the current flowing through the active fuse according to the voltage value of the constant voltage, the first voltage, and the resistance value of the current limiting module; determine the resistance value of the active fuse circuit according to the first voltage, the second voltage, and the current flowing through the active fuse; and determine the state of the active fuse according to the resistance value of the active fuse circuit.

7. The driving circuit according to claim 2, wherein: The first switch module includes a first switch, a first end of the first switch is connected to the output end of the first driving submodule, a second end of the first switch is connected to the input end of the second driving submodule, and a control end of the first switch is connected to the control module.

8. The driving circuit according to claim 2, wherein: The first driving submodule includes a first inductor, a first diode, a first capacitor and a fourth switch; A first end of the first inductor is connected to a power supply, and a second end of the first inductor is connected to a first end of the first switch and an anode of the first diode; The second end of the fourth switch is grounded, and the control end of the fourth switch is connected to the first control signal; The cathode of the first diode is connected to the first electrode of the first capacitor; A first electrode of the first capacitor is connected to a driving end of the active fuse, and a second electrode of the first capacitor is grounded.

9. The driving circuit according to claim 2, wherein: The second driving submodule includes a driving control submodule, a fifth switch, a second inductor, a second capacitor and a sampling resistor; The input end of the driving control submodule is connected to the output end of the first driving submodule through the first switch module; The first end of the second inductor is connected to the first control end of the drive control submodule and the first end of the fifth switch, and the second end of the second inductor is connected to the first electrode of the second capacitor and the first end of the sampling resistor; The second end of the fifth switch is grounded, and the control end of the fifth switch is connected to the second control signal; The second electrode of the second capacitor is grounded; The first end of the sampling resistor is connected to the first feedback signal end of the drive control submodule, and the second end of the sampling resistor is connected to the second feedback signal end of the drive control submodule and the drive end of the active fuse.

10. The driving circuit according to claim 1, wherein: The driving circuit further includes: The unidirectional conducting module is connected between the driving module and the power supply.

11. An electrical device, comprising: Active fuse; And a driving circuit as described in any one of claims 1 to 10.

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