Fuse protector and soft start control method thereof

Abstract

The present application provides a fuse protector and a soft start control method thereof, wherein the fuse protector comprises a switch module, an acquisition module and a soft start control module; the process of controlling the soft start of the fuse protector is divided into a detection phase and a soft start phase, wherein the detection phase is first entered, and the monitoring voltage of the circuit where the fuse protector is located, which is acquired by the acquisition module, is compared with a preset circuit voltage lower limit threshold and a circuit voltage upper limit threshold, and when the monitoring voltage does not meet a first condition, the voltage of a driving signal used to drive the switch module is adjusted according to a preset rule until the monitoring voltage meets the first condition; after the monitoring voltage meets the first condition, the detection phase is exited, and the soft start phase is entered, and the voltage of the adjusted driving signal is generated and output as a soft start voltage, and the driving signal is output to turn on the switch module, thereby completing the soft start of the fuse protector, and realizing closed-loop precise control of the circuit current by adjusting the voltage of the driving signal.

Description

Technical Field

[0001] The present application relates to the technical field of fuse protectors, and in particular to a fuse protector and a soft start control method thereof. Background Art

[0002] In modern electronic devices and systems, circuit protection is a key measure to ensure stable operation of equipment and prevent fault propagation. Traditional fuses and circuit breakers have long been used for circuit protection, but as electronic devices become increasingly complex and sophisticated, the limitations of traditional protection devices have gradually emerged. Therefore, some more intelligent, efficient and controllable circuit protection electronic devices such as electronic fuses (Efuse) and high-side switches have emerged.

[0003] Electronic fuses and high-side switches both use semiconductor devices such as MOS tubes as switch tubes, and control the conduction and cutoff of the switch tubes by controlling the gate voltage to achieve circuit fuse protection, but their ability to resist surge current is not as strong as traditional mechanical fuses. For large surge currents below 1ms for mechanical fuses, especially slow-blow fuses, KA-level impacts may not cause the fuse to blow, while for electronic fuses, KA-level current duration, even at the 1us level, generally far exceeds the limit range of the safe operation curve (SOA curve) of the MOS tube, which is enough to cause damage to the MOS tube.

[0004] In the prior art, there are at least three solutions to solve the problem of surge current when electronic fuses and high-side switches are started:

[0005] The first is to achieve startup based on constant current, that is, an additional grounding capacitor is set at the gate of the switch tube, and the capacitor is charged by a constant small current, and the negative feedback effect of the circuit is used to achieve constant current control. However, the MOS tube works in the linear region, and the drain-source voltage (VDS voltage) is very large, which needs to meet the limit of the DC curve in the SOA curve. The DC curve in the SOA curve has the lowest limit among all curves, and the current value of the constant current startup is generally small. The entire soft start time will be relatively long. When the value of the output capacitor is relatively large, it may not meet the startup time requirements. In addition, the MOS tube is continuously in the linear region for a long time, the power consumption is very large, the heat is serious, and there is a risk of heat loss or thermal damage.

[0006] The second is to combine overcurrent protection and MOS tube overtemperature protection to realize the soft start of the MOS tube, that is, to detect the current flowing through the MOS tube in real time, turn off the MOS tube when its current is greater than the set value, and then turn on the MOS tube after waiting for a period of time. The MOS tube is turned on and off periodically to achieve the soft start of the MOS tube. However, overcurrent protection generally has a delay of us level, and the delay time cannot be completely consistent, so there are differences in its current limiting effect. It is also because the current changes too fast and the protection speed is accelerated, so it is generally chosen to combine overtemperature protection. That is, in practice, the MOS tube is turned off immediately after the overtemperature is detected, and the MOS tube is turned on again after the temperature drops to the set threshold. This solution is more suitable for electronic fuses and high-side switches with built-in MOS tubes. For electronic fuses with external MOS tubes, the overtemperature protection response speed may not keep up, and protection may not be timely.

[0007] The third method is to achieve soft start based on PWM drive signal, that is, to achieve soft start by setting a fixed PWM small pulse width and using the parasitic inductance of the wire to limit the rate of rise of the current to achieve current limitation. This method is an open-loop current limiting method, and its final current limiting value depends not only on the set PWM drive signal, but also on the parasitic inductance of the wire. These factors ultimately lead to the inaccuracy and variability of the controlled soft start starting current, and it cannot be more widely applied.

[0008] Therefore, it is very important to solve the problem of inrush current at startup of fuse protectors such as electronic fuses and high-side switches. Summary of the invention

[0009] The present application provides a fuse protector and a soft start control method thereof, which can solve the technical problem of poor surge current resistance capability of the existing fuse protector during startup.

[0010] In a first aspect, an embodiment of the present application provides a fuse protector, including a switch module, a collection module and a soft start control module;

[0011] The acquisition module is used to acquire the monitoring current representing the current of the circuit where the fuse protector is located, and convert the monitoring current into a monitoring voltage output after amplifying the monitoring current;

[0012] The soft start control module at least includes a threshold comparison unit, a logic control unit and a drive control unit;

[0013] The threshold comparison unit is used to obtain the monitoring voltage and output a comparison result of whether the monitoring voltage meets a first condition; the first condition is that the monitoring voltage is greater than or equal to a preset loop voltage lower limit threshold and less than or equal to a preset loop voltage upper limit threshold;

[0014] The logic control unit has two states: a detection phase and a soft start phase; in the detection phase, the logic control unit is used to obtain the comparison result, and when the monitoring voltage does not meet the first condition, adjust the voltage of the driving signal used to drive the switch module according to a preset rule until the monitoring voltage meets the first condition; when the monitoring voltage meets the first condition, exit the detection phase, enter the soft start phase, and output the adjusted voltage of the driving signal;

[0015] The drive control unit is used to obtain the voltage of the adjusted drive signal output by the logic control unit, use the voltage as the soft start voltage, output the drive signal, turn on the switch module, and complete the soft start of the fuse protector.

[0016] In some embodiments, when the monitoring voltage does not satisfy the first condition, the logic control unit is also used to generate and output a first adjustment signal when the monitoring voltage is less than the lower limit threshold of the loop voltage; and to generate and output a second adjustment signal when the monitoring voltage is greater than the upper limit threshold of the loop voltage.

[0017] In some embodiments, the logic control unit is also used to respond to the first adjustment signal, gradually increase the voltage of the drive signal with a preset first step voltage according to the cycle of the drive signal, until the acquired monitoring voltage is greater than or equal to the lower limit threshold of the loop voltage; and, respond to the second adjustment signal, gradually reduce the voltage of the drive signal with a preset second step voltage according to the cycle of the drive signal, until the acquired monitoring voltage is less than or equal to the upper limit threshold of the loop voltage.

[0018] In some embodiments, the logic control unit is further configured to exit the detection phase and automatically enter the soft start phase when the number of times the voltage of the driving signal is adjusted according to a preset rule reaches a threshold of the number of adjustments.

[0019] In some embodiments, the logic control unit is further used to exit the detection phase and automatically enter the soft start phase when the acquired monitoring voltage does not satisfy the first condition after adjusting the voltage of the driving signal according to a preset rule.

[0020] In some embodiments, after exiting the detection phase and automatically entering the soft start phase, the logic control unit is also used to determine the soft start voltage of the drive signal generated after entering the soft start phase based on the relationship between the monitoring voltage and the loop voltage lower limit threshold and the loop voltage upper limit threshold.

[0021] In some embodiments, the logic control unit determines the soft start voltage of the driving signal generated after entering the soft start phase according to the relationship between the monitoring voltage and the loop voltage lower limit threshold and the loop voltage upper limit threshold, including:

[0022] After adjusting the voltage of the driving signal for multiple times, when the acquired monitoring voltage is always less than the loop voltage lower limit threshold or greater than the loop voltage upper limit threshold, the voltage at which the monitoring voltage is less than the loop voltage lower limit threshold for the last time is used as the soft start voltage;

[0023] Or, after adjusting the voltage of the driving signal for multiple times, the acquired monitoring voltage is always less than the loop voltage lower limit threshold, and the adjusted voltage has reached the preset driving voltage threshold, and the last adjusted voltage is used as the soft start voltage.

[0024] In some embodiments, the driving control unit is further used to set the on-time and period of the driving signal.

[0025] In some embodiments, during the detection phase and the soft start phase, the on-time and the period of the driving signal are different.

[0026] In a second aspect, an embodiment of the present application provides a soft start control method for a fuse protector, wherein the soft start of the fuse protector includes a detection phase and a soft start phase; the method includes:

[0027] Obtaining a monitoring current of the circuit where the fuse protector is located, and converting the monitoring current into a monitoring voltage;

[0028] Comparing and determining whether the monitoring voltage satisfies a first condition; wherein the first condition is that the monitoring voltage is greater than or equal to a preset loop voltage lower limit threshold, and less than or equal to a preset loop voltage upper limit threshold;

[0029] In the detection phase, when the monitoring voltage does not satisfy the first condition, adjusting the voltage of the driving signal for driving the soft start of the fuse protector according to a preset rule until the monitoring voltage satisfies the first condition;

[0030] When the monitoring voltage satisfies the first condition, exiting the detection phase, entering the soft start phase, and outputting the adjusted voltage of the driving signal;

[0031] In the soft start phase, the adjusted voltage of the driving signal is used as the soft start voltage to drive the fuse protector to achieve soft start.

[0032] In a third aspect, an embodiment of the present application provides a computer-readable storage medium, in which computer execution instructions are stored. When the computer execution instructions are executed by a processor, they are used to implement the soft start control method of the fuse protector as described in any of the above embodiments.

[0033] In a fourth aspect, an embodiment of the present application provides a chip, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement a soft start control method for a fuse protector as described in any of the above embodiments.

[0034] In a fifth aspect, an embodiment of the present application provides a computer program product, which is stored in a storage medium and is executed by at least one processor to implement a soft start control method for a fuse protector as described in any of the above embodiments.

[0035] The embodiment of the present application provides a fuse protector and a soft start control method thereof, the fuse protector includes a switch module, an acquisition module and a soft start control module, the process of controlling the soft start of the fuse protector is divided into a detection phase and a soft start phase, first entering the detection phase, comparing the monitoring voltage of the circuit where the fuse protector is located collected by the acquisition module with the preset circuit voltage lower limit threshold and circuit voltage upper limit threshold, when the monitoring voltage does not meet the first condition, adjusting the voltage of the driving signal used to drive the switch module according to the preset rule until the monitoring voltage meets the first condition; after the monitoring voltage meets the first condition, exiting the detection phase, entering the soft start phase, generating and outputting the voltage of the adjusted driving signal as the soft start voltage, outputting the driving signal to turn on the switch module, and completing the soft start of the fuse protector. The present application realizes the closed-loop precise control of the circuit current by adjusting the voltage of the driving signal during the soft start process, thereby improving the surge current resistance capability of the fuse protector, and is independent of the structure and external environment of the fuse protector, and is more universal. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0037] Figure 1 A schematic diagram of the structure of a fuse protector provided in one embodiment of the present application.

[0038] Figure 2 A timing diagram for adjusting the driving signal voltage provided in one embodiment of the present application.

[0039] Figure 3 A timing diagram for adjusting the driving signal voltage provided in another embodiment of the present application.

[0040] Figure 4 A timing diagram for adjusting the driving signal voltage provided in yet another embodiment of the present application.

[0041] Figure 5 A timing diagram for adjusting the driving signal voltage provided in yet another embodiment of the present application.

[0042] Figure 6 A schematic diagram of the structure of a fuse protector provided in another embodiment of the present application.

[0043] Figure 7 A flowchart of a soft start control method for a fuse protector provided in one embodiment of the present application.

[0044] Figure 8 A flowchart of a soft start control method for a fuse protector provided in another embodiment of the present application.

[0045] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0046] The present application is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0047] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0048] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable when appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are usually a class, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated before and after are in an "or" relationship. The "connection" and "connection" mentioned in this application, unless otherwise specified, include direct and indirect connections (connections).

[0049] The soft start of the fuse protector refers to the process of applying a gradually increasing voltage or current to the load during the startup process of the load device connected to it, so that the load can smoothly reach the rated working state and avoid the current shock during startup. During the soft start process of the fuse protector, the control module of the fuse protector monitors the current and voltage changes of the circuit. When it is detected that the load starts to start, the control module gradually increases the output voltage or current until the load reaches the rated working state. In this process, the increase in current is smooth, avoiding the current shock in the traditional startup method. During the startup process, if the current exceeds the set value, the fuse protector will quickly blow, cut off the circuit, and protect the safety of the circuit and equipment. Parameters such as the current and time of the soft start can be adjusted according to the characteristics of the load to meet the startup requirements of different loads. As described in the background technology, the soft start method of the existing fuse protector has a strong dependence on the parasitic inductance of the wire, which may cause problems such as untimely protection and poor surge current resistance.

[0050] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0051] Figure 1 This is a schematic diagram of the structure of a fuse protector provided by an embodiment of the present application. Figure 1 As shown, the fuse protector provided in this embodiment is connected between the power input terminal and the load input terminal in the circuit. Generally, it is connected in series in the circuit to be protected or before the components to be protected. The fuse protector includes at least an acquisition module 110, a switch module 120 and a soft start control module 130 connected in sequence.

[0052] In this embodiment, the acquisition module 110 is used to acquire the monitoring current representing the current of the circuit where the fuse protector is located, and convert the monitoring current into a monitoring voltage after amplification, and output it in the form of a digital signal. In some embodiments, the acquisition module 110 includes an acquisition component, an amplification component, and an analog-to-digital conversion component, wherein the acquisition component is used to acquire the current value of the circuit where the fuse protector is located, the amplification component is used to amplify the acquired current value by a certain multiple to ensure the accuracy of subsequent data processing, and the analog-to-digital conversion component is used to convert the acquired analog signal representing the circuit current value into a voltage signal, and output it in the form of a digital signal for digital control.

[0053] The switch module 120 is used to disconnect the connection between the first end and the second end of the disconnector in response to a driving signal when an abnormal situation such as overvoltage or overcurrent occurs in the circuit, that is, by controlling the conduction and cutoff of the switch module 120, the circuit can be closed and disconnected, thereby achieving the purpose of controlling the operation of the electrical equipment, thereby preventing the electrical equipment from being damaged and ensuring the safe operation of the circuit and the electrical equipment. MOS tubes are often used as switching devices in fuse protectors. MOS tubes have the advantages of fast switching speed, low on-resistance, and low power consumption, and are very suitable for switch control of fuse protectors. When the current exceeds the set value, the MOS tube can quickly cut off the circuit, thereby protecting the cables, PCB traces and other components in the circuit from damage. In other embodiments, the switch module 120 may also use a relay, which is an electrical component that controls the on and off of the circuit through electromagnetic effects. In addition to MOS tubes and relays, some other types of switch devices can also be used for switch control of fuse protectors, such as thyristors, IGBTs, etc., which need to be selected according to specific needs.

[0054] The soft start control module 130 is used to obtain the monitoring voltage output by the acquisition module 110, obtain the driving voltage required by the switch module 120 through the scanning stage, and perform soft start with this driving voltage to achieve soft start. The fuse protector provided in this embodiment divides the soft start process into two stages, namely, the detection stage and the soft start stage. When the fuse protector starts working, that is, when current flows through the fuse protector, it automatically enters the detection stage.

[0055] In this embodiment, the soft start control module 130 at least includes a threshold comparison unit 1301 , a logic control unit 1302 and a drive control unit 1303 .

[0056] Among them, the threshold comparison unit 1301 is used to obtain the monitoring voltage output by the acquisition module 110, determine whether the monitoring voltage meets the preset first condition, and output the comparison result of whether the monitoring voltage meets the first condition. Specifically, the first condition is that the monitoring voltage is greater than or equal to the preset loop voltage lower limit threshold, and less than or equal to the preset loop voltage upper limit threshold. It can be understood that the loop voltage of the loop where the fuse protector is located should be within the range of its rated voltage to ensure that the fuse protector can work safely and effectively. The upper limit of the loop voltage of the fuse protector should not exceed its rated voltage, that is, the voltage that the fuse can withstand for a long time and is also the maximum voltage that the fuse can withstand after the fuse is disconnected. Generally, the highest voltage in the circuit where the fuse is located should not exceed the rated voltage of the fuse, otherwise continuous arcing and voltage breakdown may occur when the fuse is blown, thereby generating ignition of an explosive environment. After determining the load circuit, when selecting a fuse, ensure that its rated voltage is greater than or equal to the highest voltage of the circuit in which it is located. In practice, although there is no clear numerical requirement for the lower limit of the circuit voltage of the fuse protector, in order to ensure that the fuse can work properly, the circuit voltage should be high enough to maintain the normal current and temperature distribution inside the fuse. Generally speaking, as long as the circuit voltage does not exceed the rated voltage of the fuse and can ensure the normal current flow inside the fuse, it can be considered that the circuit voltage is above the lower limit.

[0057] In some embodiments, the threshold comparison unit 1301 includes at least a first comparator and a second comparator, wherein the first comparator is used to compare the monitoring voltage with the lower limit threshold of the loop voltage and output a first comparison result; the second comparator is used to compare the monitoring voltage with the upper limit threshold of the loop voltage and output a second comparison result. The first comparison result characterizes the relationship between the monitoring voltage and the lower limit threshold of the loop voltage, and the second comparison result characterizes the relationship between the monitoring voltage and the upper limit threshold of the loop voltage, that is, according to the first comparison result and the second comparison result output by the first comparator and the second comparator, the relationship between the monitoring voltage and the lower limit threshold of the loop voltage and the upper limit threshold of the loop voltage can be known, and it can be determined whether it meets the first condition, which provides a basis for the subsequent adjustment of the voltage of the drive signal.

[0058] In some embodiments, the threshold comparison unit 1301 can also be a logic chip or a single-chip microcomputer with a built-in comparator, which can compare the monitoring voltage with the loop voltage lower limit threshold and the loop voltage upper limit threshold, and output a comparison result of whether the monitoring voltage meets the first condition.

[0059] The logic control unit 1302 is used to obtain the comparison result (the first comparison result and the second comparison result) output by the threshold comparison unit 1301 during the detection phase, and when the monitoring voltage does not meet the first condition, adjust the voltage of the driving signal used to drive the switch module 120 according to a preset rule until the monitoring voltage meets the first condition; when the monitoring voltage meets the first condition, exit the detection phase, enter the soft start phase, and output the adjusted voltage of the driving signal.

[0060] The drive control unit 1303 is used to obtain the voltage of the adjusted drive signal output by the logic control unit, and use the voltage as the soft start voltage to output the drive signal, turn on the switch module 120, and complete the soft start of the fuse protector.

[0061] Based on the structure of the above-mentioned fuse protector, the invention point of the present application also lies in that after entering the detection stage, the logic control unit 1302 in the soft start control module 130 adjusts the voltage of the drive signal according to preset rules until the acquired monitoring voltage meets the first condition, determines the soft start voltage that meets the conditions, and outputs the adjusted drive signal through the drive control unit 1303 to realize the soft start of the fuse protector, so that the load can smoothly reach the rated working state and avoid current shock during startup.

[0062] The following describes the process of soft start control performed by the soft start control module 130 .

[0063] As described above, in some embodiments, in the detection stage, before the logic control unit 1302 adjusts the voltage of the driving signal for driving the switch module 120 according to the preset rule, it needs to determine how to adjust the voltage of the driving signal, specifically including: when the monitoring voltage is less than the lower limit threshold of the loop voltage, generating and outputting a first adjustment signal; when the monitoring voltage is greater than the upper limit threshold of the loop voltage, generating and outputting a second adjustment signal. In this way, the voltage of the driving signal can be adjusted according to different adjustment signals later.

[0064] In the detection phase, the logic control unit 1302 needs to adjust the voltage of the driving signal according to the preset rules until the acquired monitoring voltage meets the first condition and can enter the soft start phase. In the detection phase, the adjustment process can be divided into two cases, specifically:

[0065] The logic control unit 1302 responds to the first adjustment signal, that is, when the monitoring voltage is less than the loop voltage lower limit threshold, it gradually increases the voltage of the driving signal with a preset first step voltage according to the cycle of the driving signal until the acquired monitoring voltage is greater than or equal to the loop voltage lower limit threshold.

[0066] It can be understood that, under normal circumstances, the preset initial voltage of the drive signal is the minimum value for the drive control switch module 120 to turn on. At this time, the drive voltage is small, and the load current is limited by the drive voltage, resulting in the monitoring voltage being less than the set loop voltage lower limit. Therefore, it is necessary to gradually increase the initial voltage of the drive signal and adjust it to the monitoring voltage being greater than or equal to the loop voltage lower limit threshold. The adjusted voltage at this time is used as the soft start voltage of the drive signal, and the output drive signal controls the switch module 120 to turn on, completing the soft start process.

[0067] It should be noted that, in general, the initial voltage of the driving signal is close to or less than the conduction threshold voltage of the switch module 120. When setting the initial voltage of the driving signal, it can be set according to the conduction threshold voltage of the switch module 120. The initial voltage of the driving signal is set to be lower than the conduction threshold voltage, so that under the driving voltage, the switch module 120 is in a non-conducting state, or a slightly conducting state (the recommended current is less than 1A). For example, assuming that the rated conduction voltage of a switch module 120 is 2-4V Vth, the initial voltage of the driving signal can be set to 2.5V.

[0068] Figure 2 A timing diagram for adjusting the driving signal voltage provided by an embodiment of the present application. Figure 2 In the figure, each signal specifically represents the following: the red voltage line HSHT_THR represents the upper threshold of the loop voltage, the green voltage line SFST_HSHT_THR represents the lower threshold of the loop voltage, Vopt represents the monitoring voltage obtained in real time, Vgs_set represents the voltage value of the drive signal, Vgs_int represents the initial voltage value of the drive signal, and Vgs_step represents the first step voltage.

[0069] like Figure 2 As shown, at the beginning of soft start, the monitoring voltage Vopt is less than the loop voltage lower limit threshold SFST_HSHT_THR, the logic control unit 1302 obtains that the monitoring voltage Vopt does not meet the first condition, remains in the detection stage, and generates a first adjustment signal, the logic control unit 1302 responds to the first adjustment signal, according to the cycle of the drive signal Vgs_set, according to the first step voltage Vgs_step gradually increases, adjusts the initial voltage Vgs_int, until the monitoring voltage Vopt is greater than or equal to the loop voltage lower limit threshold SFST_HSHT_THR, at this time the adjusted Vgs_set is the soft start voltage, the drive control unit 1303 is controlled to output the drive signal with this voltage, controls the switch module 120 to turn on, and completes the soft start.

[0070] It should be noted that if Figure 2As shown, during the soft start phase, the voltage of the drive signal, i.e., the soft start voltage Vgs_set, remains unchanged. After the soft start ends, the voltage of the drive signal will return to the normal drive voltage (i.e., the preset threshold of the drive voltage). At the same time, during the soft start phase, as the soft start is gradually completed, the output voltage from the power supply to the load is gradually established, and the current and voltage of the fuse protector will gradually decrease.

[0071] Similarly, the logic control unit 1302 responds to the second adjustment signal, that is, when the monitoring voltage is greater than the loop voltage upper limit threshold, it gradually reduces the initial voltage with a preset second step voltage according to the cycle of the drive signal until the acquired monitoring voltage is less than or equal to the loop voltage upper limit threshold.

[0072] It can be understood that when the monitoring voltage is greater than the upper limit threshold of the loop voltage, if the voltage of the driving signal is too large at this time, the switch module 120 will be turned on according to the voltage, and the surge current will be too large. Therefore, it is necessary to reduce the driving voltage in time and adjust it to the monitoring voltage less than or equal to the upper limit threshold of the loop voltage. The adjusted voltage at this time is used as the soft start control voltage of the driving signal to control the switch module 120 to turn on and complete the soft start process.

[0073] It should be noted that, in general, the driving signal is a PWM signal. When adjusting, the initial voltage is gradually increased with a specific first step voltage or the initial voltage is gradually reduced with a second step voltage according to its signal cycle, so that the adjustment process is controllable.

[0074] In some embodiments, the driving control unit 1303 is also used to set the on-time and period of the driving signal. For the driving signal, the on-time and period in the detection phase and the soft start phase can be the same or different, and can be flexibly configured as needed.

[0075] It is understandable that in the detection phase, when the drive signal is adjusted according to the first adjustment signal or the second adjustment signal, it is based on the cycle of the drive signal, and the first step voltage or the second step voltage is increased or decreased. In order to ensure the accuracy of the detection adjustment and shorten the detection cycle, a smaller on-time and cycle can be set, for example, the on-time can be set to 5μs, and the cycle can be set to 50μs. After entering the soft start phase, the drive signal controls the conduction of the switch module 120, and its on-time (i.e., duty cycle) and cycle can be set to be greater than the on-time and cycle of the detection phase. If the on-time and cycle of the detection phase are continued to be used, the switch module 120 may overheat during the soft start process.

[0076] In some embodiments, during the detection phase, when adjusting the driving signal according to the first adjustment signal or the second adjustment signal, the first step voltage and the second step voltage may be equal or unequal, and may be set according to actual conditions. For example, the first step voltage and the second step voltage may be set to 25 mV.

[0077] Figure 3 This is a timing diagram for adjusting the driving signal voltage provided by another embodiment of the present application. Figure 3 As shown, during the process of increasing the driving voltage in the detection phase, the logic control unit 1302 obtains that the monitoring voltage Vopt exceeds the loop voltage upper limit threshold HSHT_THR. At this time, the logic control unit 1302 still remains in the detection phase and generates a second adjustment signal. The logic control unit 1302 responds to the second adjustment signal, and gradually increases according to the second step voltage Vgs_step according to the cycle of the driving signal Vgs_set, and adjusts the voltage of the driving signal Vgs_set until the monitoring voltage Vopt is less than or equal to the loop voltage upper limit threshold HSHT_THR and greater than or equal to the loop voltage lower limit threshold SFST_HSHT_THR, that is, the first condition is met. At this time, the adjusted Vgs_set is the soft start voltage, and the driving control unit 1303 is controlled to output the driving signal with this voltage, and the switch module 120 is controlled to be turned on to complete the soft start.

[0078] In some embodiments, it may happen that the logic control unit 1302 continuously adjusts the voltage of the driving signal according to the first adjustment signal and / or the second adjustment signal, but is unable to make the monitoring voltage meet the first condition. That is, after multiple adjustments, the monitoring voltage is always less than the lower limit threshold of the loop voltage or greater than the upper limit threshold of the loop voltage. In this case, it is necessary to set a threshold for the number of adjustments. When the number of times the voltage of the driving signal is adjusted according to the preset rules reaches the threshold for the number of adjustments, the logic control unit 1302 exits the detection phase and automatically enters the soft start phase.

[0079] In some embodiments, it may also happen that the logic control unit 1302 continuously adjusts the voltage of the driving signal according to the first adjustment signal, but is unable to make the monitoring voltage meet the first condition. That is, after multiple adjustments, the monitoring voltage is always less than the lower limit threshold of the loop voltage. At the same time, for the driving signal, after multiple adjustments, the voltage value of the driving signal has reached its preset driving voltage threshold (which may be the maximum voltage value of the driving switch module 120). In this case, it is necessary to interrupt the detection phase in time to save the soft start control cycle. At this time, the logic control unit 1302 exits the detection phase and automatically enters the soft start phase.

[0080] In the above scenario, that is, after the logic control unit 1302 exits the detection phase and automatically enters the soft start phase, the logic control unit 1302 is also used to determine the soft start voltage of the drive signal generated after entering the soft start phase based on the relationship between the monitoring voltage and the loop voltage lower limit threshold and the loop voltage upper limit threshold.

[0081] For scenario one, the logic control unit 1302 continuously adjusts the voltage of the driving signal according to the first adjustment signal and the second adjustment signal, but is unable to make the monitoring voltage meet the first condition. That is, after multiple adjustments, when the monitoring voltage is always less than the lower limit threshold of the loop voltage or greater than the upper limit threshold of the loop voltage, the logic control unit 1302 automatically enters the soft start stage, and uses the driving signal voltage when the last monitoring voltage is less than the lower limit threshold of the loop voltage as the soft start voltage, and controls the switch module 120 to conduct by outputting a driving signal of the corresponding voltage through the driving control unit 1303, thereby completing the soft start.

[0082] Figure 4 A timing diagram for adjusting the driving signal voltage provided by another embodiment of the present application. Figure 4 As shown, the logic control unit 1302 continuously adjusts the voltage of the drive signal Vgs_set according to the first adjustment signal and the second adjustment signal, but the monitoring voltage Vopt cannot always meet the first condition. The monitoring voltage Vopt is always less than the loop voltage lower limit threshold SFST_HSHT_THR or greater than the loop voltage upper limit HSHT_THR. At this time, the logic control unit 1302 will exit the detection mode and automatically enter the soft start stage, using the drive signal voltage when the last monitoring voltage Vopt is less than the loop voltage lower limit threshold SFST_HSHT_THR as the soft start voltage. Figure 4 As shown, in the process of adjusting the driving signal voltage for the last three times, the monitoring voltage Vopt is respectively greater than the loop voltage upper limit HSHT_THR, less than the loop voltage lower limit threshold SFST_HSHT_THR and greater than the loop voltage upper limit HSHT_THR. After exiting the detection mode, the voltage of Vgs_set corresponding to the second to last adjustment is used as the soft start voltage.

[0083] For scenario two, the logic control unit 1302 continuously adjusts the voltage of the driving signal according to the first adjustment signal, but is unable to make the monitoring voltage meet the first condition. That is to say, after multiple adjustments, the monitoring voltage is always less than the lower limit threshold of the loop voltage. At the same time, the voltage value of the driving signal has reached its preset driving voltage threshold. After the logic control unit 1302 automatically enters the soft start stage, it uses the last adjusted driving signal voltage as the soft start voltage, and controls the switch module 120 to conduct by outputting a driving signal of the corresponding voltage through the driving control unit 1303, thereby completing the soft start.

[0084] Figure 5 A timing diagram for adjusting the driving signal voltage provided by another embodiment of the present application. Figure 5 As shown, the logic control unit 1302 continuously adjusts the voltage of the drive signal Vgs_set according to the first adjustment signal, but the monitoring voltage Vopt cannot always meet the first condition. The monitoring voltage Vopt is always less than the loop voltage lower limit threshold SFST_HSHT_THR, and the drive voltage after multiple adjustments has reached its preset drive voltage threshold. At this time, the logic control unit 1302 will exit the detection mode and automatically enter the soft start stage, using the last adjusted drive signal voltage as the soft start voltage. Figure 5 As shown, in the process of adjusting the driving signal voltage multiple times, the monitoring voltage Vopt is always less than the loop voltage lower limit threshold SFST_HSHT_THR. After exiting the detection mode, the voltage of Vgs_set corresponding to the last adjustment is used as the soft start voltage.

[0085] To summarize, the fuse protector provided in this embodiment includes a switch module, an acquisition module and a soft start control module. The process of controlling the soft start of the fuse protector is divided into a detection stage and a soft start stage. First, the detection stage is entered, and the monitoring voltage of the circuit where the fuse protector is located, which is collected by the acquisition module, is compared with the preset circuit voltage lower limit threshold and circuit voltage upper limit threshold. When the monitoring voltage does not meet the first condition, the voltage of the driving signal used to drive the switch module is adjusted according to the preset rules until the monitoring voltage meets the first condition; after the monitoring voltage meets the first condition, the detection stage is exited and the soft start stage is entered, and the voltage of the adjusted driving signal is generated and output as the soft start voltage, and the output driving signal turns on the switch module to complete the soft start of the fuse protector.

[0086] That is, the present application realizes the closed-loop precise control of the loop current by adjusting the voltage of the driving signal during the soft start process, thereby improving the surge current resistance capability of the fuse protector, and is independent of the structure and external environment of the fuse protector, making it more universal.

[0087] Figure 6 This is a schematic diagram of the structure of a fuse protector provided in another embodiment of the present application. Figure 6 As shown, the fuse protector provided in this embodiment is connected between the power input terminal and the load input terminal in the circuit, and the fuse protector at least includes a collection module 610, a switch module 620 and a soft start control module 630 connected in sequence.

[0088] In this embodiment, the soft start control module 630 includes at least a processor and a memory that can implement the soft start control process of any of the above embodiments. The processor can be a microprocessor such as a single-chip microcomputer or an FPGA. The memory is used to store computer programs, and the processor is used to implement the soft start control process of any of the above embodiments when the computer program is executed.

[0089] Figure 7 This is a flow chart of a soft start control method for a fuse protector provided in one embodiment of the present application. Figure 7 As shown, the processor of the soft start control module 630 is used for each step of the soft start control method. The soft start control method of the fuse protector provided in this embodiment includes a detection phase and a soft start phase, which specifically includes the following steps:

[0090] Step S710: Obtain a monitoring current of the circuit where the fuse protector is located, and convert the monitoring current into a monitoring voltage.

[0091] Step S720, comparing and determining whether the monitoring voltage satisfies a first condition; wherein the first condition is that the monitoring voltage is greater than or equal to a preset loop voltage lower limit threshold, and less than or equal to a preset loop voltage upper limit threshold.

[0092] Step S730: During the detection phase, when the monitored voltage does not satisfy the first condition, the voltage of the driving signal for the soft start of the fuse protector is adjusted according to a preset rule until the monitored voltage satisfies the first condition.

[0093] Step S740: when the monitored voltage meets the first condition, exit the detection phase, enter the soft start phase, and output the voltage of the adjusted drive signal.

[0094] Step S750: In the soft start phase, the voltage of the adjusted driving signal is used as the soft start voltage to drive the fuse protector to achieve soft start.

[0095] That is, in this embodiment, the soft start control module divides the control process into a detection phase and a soft start phase according to the relationship between the acquired monitoring voltage and the preset loop voltage lower limit threshold and loop voltage upper limit threshold. Based on the working principle of the soft start of the fuse protector, that is, in the process of realizing the soft start, the power loop current or voltage is gradually increased to prevent the generation of large surge current and damage to the power device.

[0096] When the monitoring voltage does not meet the first condition, that is, when the monitoring voltage is less than the lower limit threshold of the loop voltage or greater than the upper limit threshold of the loop voltage, it is necessary to increase or decrease the voltage of the drive signal and keep it in the detection stage. In the detection stage, the voltage of the drive signal is adjusted according to the preset rules until the acquired monitoring voltage meets the first condition. When the monitoring voltage meets the first condition, that is, when the monitoring voltage is between the lower limit threshold of the loop voltage and the upper limit threshold of the loop voltage or equal to the boundary, it is considered that the current monitoring voltage is within the rated operating voltage range, and the soft start stage is entered at this time. The drive control unit 1303 uses the adjusted voltage as the driving signal of the soft start voltage to control the switch module to turn on and complete the soft start control process.

[0097] In some embodiments, in step S730, when the monitored voltage does not satisfy the first condition, the following steps are performed:

[0098] Step S7301: When the monitoring voltage is less than the loop voltage lower limit threshold, generate and output a first adjustment signal;

[0099] Step S7302: When the monitored voltage is greater than the loop voltage upper limit threshold, generate and output a second adjustment signal.

[0100] In some embodiments, in step S730, during the detection phase, when the monitored voltage does not satisfy the first condition, adjusting the voltage of the driving signal for soft starting of the fuse protector for driving according to a preset rule until the monitored voltage satisfies the first condition includes:

[0101] Step S7303, in response to the first adjustment signal, gradually increase the voltage of the drive signal with a preset first step voltage according to the cycle of the drive signal until the acquired monitoring voltage is greater than or equal to the lower limit threshold of the loop voltage; and, in response to the second adjustment signal, gradually reduce the voltage of the drive signal with a preset second step voltage according to the cycle of the drive signal until the acquired monitoring voltage is less than or equal to the upper limit threshold of the loop voltage.

[0102] Figure 8 This is a flow chart of a soft start control method for a fuse protector provided in another embodiment of the present application. Figure 8 As shown, the soft start control method of the fuse protector provided in this embodiment includes:

[0103] Step S810: Obtain a monitoring current of the circuit where the fuse protector is located, and convert the monitoring current into a monitoring voltage.

[0104] Step S820, comparing and determining whether the monitoring voltage satisfies a first condition; wherein the first condition is that the monitoring voltage is greater than or equal to a preset loop voltage lower limit threshold, and less than or equal to a preset loop voltage upper limit threshold.

[0105] Step S830: During the detection phase, when the monitored voltage does not satisfy the first condition, the voltage of the driving signal for the soft start of the fuse protector is adjusted according to a preset rule until the monitored voltage satisfies the first condition.

[0106] Step S840: When the number of times the voltage of the driving signal is adjusted according to the preset rule reaches a threshold of the number of adjustments, the detection phase is exited and the soft start phase is automatically entered.

[0107] In some embodiments, the soft start control method of the fuse protector further includes:

[0108] Step S850: After adjusting the voltage of the driving signal according to the preset rule, when the acquired monitoring voltage still does not meet the first condition, exit the detection phase and automatically enter the soft start phase.

[0109] It should be noted that step S840 and step S850 may be executed simultaneously or at different times, and the drawings of this embodiment do not make any specific limitation thereto.

[0110] Step S860: when the monitored voltage meets the first condition, exit the detection phase, enter the soft start phase, and output the voltage of the adjusted drive signal.

[0111] In some embodiments, after exiting the detection phase and automatically entering the soft start phase, the method further includes:

[0112] Step S870: Determine the soft start voltage of the driving signal generated after entering the soft start phase according to the relationship between the monitoring voltage and the loop voltage lower limit threshold and the loop voltage upper limit threshold.

[0113] Step S880: In the soft start phase, the voltage of the adjusted driving signal is used as the soft start voltage to drive the fuse protector to achieve soft start.

[0114] In some embodiments, step S870, determining the soft start voltage of the driving signal generated after entering the soft start phase according to the relationship between the monitoring voltage and the loop voltage lower limit threshold and the loop voltage upper limit threshold, specifically includes:

[0115] Step S8701: after adjusting the voltage of the driving signal for multiple times, if the acquired monitoring voltage is always less than the loop voltage lower limit threshold or greater than the loop voltage upper limit threshold, the voltage at which the last monitoring voltage is less than the loop voltage lower limit threshold is used as the soft start voltage;

[0116] Step S8702: After adjusting the voltage for multiple times, the acquired monitoring voltage is always less than the loop voltage lower limit threshold, and the adjusted voltage has reached the preset driving voltage threshold, and the last adjusted voltage is used as the soft start voltage.

[0117] It should be noted that step S8701 and step S8702 may be executed simultaneously or at different times, and the drawings of this embodiment do not provide any specific limitation thereto.

[0118] For any of the above embodiments, when the fuse protector implements the soft start control method, the explanation of the above product embodiments can be referred to, and the technical effects of any of the above embodiments are achieved. To avoid repetition, they will not be described here.

[0119] It should be noted that when the soft start control method is implemented by software, two auxiliary signals can be introduced, such as Figures 2 to 6 The HSHT signal and SFSTAR_REDY signal shown in the figure, wherein, when the monitoring voltage Vopt meets the first condition, the SFSTAR_REDY signal is set to a high level (the high level in the figure is the effective level, and the low level can also be defined as the effective level), and when the monitoring voltage Vopt is greater than the loop voltage upper limit threshold HSHT_THR, the HSHT signal is set to a high level (the high level in the figure is the effective level, and the low level can also be defined as the effective level).

[0120] The level status of the HSHT signal and the SFSTAR_REDY signal can be used to play an auxiliary role in determining the soft start voltage of the generated drive signal according to the relationship between the monitoring voltage and the loop voltage lower limit threshold and the loop voltage upper limit threshold after exiting the detection phase and automatically entering the soft start phase.

[0121] For example, according to the first adjustment signal and the second adjustment signal, the voltage of the driving signal is continuously adjusted, but the monitoring voltage cannot always meet the first condition. That is to say, after multiple adjustments, when the monitoring voltage is always less than the lower limit threshold of the loop voltage or greater than the upper limit threshold of the loop voltage, the processor automatically enters the soft start stage. At this time, the auxiliary signal is referred to, and the voltage value of the driving voltage corresponding to the last time HSHT=0 and SFSTAR_REDY=0 is used as the soft start voltage, that is, the driving signal voltage corresponding to the last time the monitoring voltage was less than the lower limit threshold of the loop voltage.

[0122] For another example, the voltage of the drive signal is continuously adjusted according to the first adjustment signal, but the monitoring voltage cannot always satisfy the first condition, that is, after multiple adjustments, the monitoring voltage is always less than the loop voltage lower limit threshold, and at the same time, the voltage of the drive signal has reached its preset drive voltage threshold, that is, the maximum value of the drive signal voltage. After the processor automatically enters the soft start stage, it can also refer to the auxiliary signal at this time, and use the voltage value of the drive voltage corresponding to the last HSHT=0 and SFSTAR_REDY=0 as the soft start voltage, that is, corresponding to the last adjusted drive signal voltage as the soft start voltage, that is, the maximum value of the drive signal voltage as the soft start voltage, to achieve the soft start function.

[0123] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of any embodiment of the soft start control method of the above-mentioned fuse protector are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0124] The processor may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0125] An embodiment of the present application also provides a chip, which includes a processor and a communication interface, wherein the communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the various processes of any embodiment of the soft start control method of the above-mentioned fuse protector, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0126] It can be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0127] Those skilled in the art will appreciate that all or part of the functions of the various methods in the above-mentioned embodiments can be implemented by hardware or by computer programs. When all or part of the functions in the above-mentioned embodiments are implemented by computer programs, the program can be stored in a computer-readable storage medium, and the storage medium can include: read-only memory, random access memory, disk, optical disk, hard disk, etc., and the program is executed by a computer to implement the above-mentioned functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the above-mentioned functions can be implemented. In addition, when all or part of the functions in the above-mentioned embodiments are implemented by computer programs, the program can also be stored in a storage medium such as a server, another computer, disk, optical disk, flash disk or mobile hard disk, and can be downloaded or copied and saved in the memory of the local device, or the system of the local device is updated, and when the program in the memory is executed by the processor, all or part of the functions in the above-mentioned embodiments can be implemented.

[0128] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the inspiration of the present application, ordinary technicians in the field can make several simple deductions, deformations or substitutions based on the ideas of the present application without departing from the scope of protection of the purpose of the present application and the claims. All of these are within the protection of the present application.

Claims

1. A fuse protector, wherein the soft start control of the fuse protector is divided into a detection stage and a soft start stage; characterized in that: The fuse protector includes a switch module, a collection module and a soft start control module; The acquisition module is used to acquire the monitoring current representing the current of the circuit where the fuse protector is located, and convert the monitoring current into a monitoring voltage output after amplifying the monitoring current; The soft start control module at least includes a threshold comparison unit, a logic control unit and a drive control unit; The threshold comparison unit is used to obtain the monitoring voltage and output a comparison result of whether the monitoring voltage meets a first condition; the first condition is that the monitoring voltage is greater than or equal to a preset loop voltage lower limit threshold and less than or equal to a preset loop voltage upper limit threshold; The logic control unit is used to obtain the comparison result in the detection phase, and when the monitoring voltage does not meet the first condition, adjust the voltage of the drive signal used to drive the switch module according to a preset rule until the monitoring voltage meets the first condition; when the monitoring voltage meets the first condition, exit the detection phase, enter the soft start phase, and output the adjusted voltage of the drive signal; wherein the preset rule includes gradually increasing the voltage of the drive signal with a preset first step voltage according to the cycle of the drive signal; or, gradually reducing the voltage of the drive signal with a preset second step voltage according to the cycle of the drive signal; The drive control unit is used to obtain the voltage of the adjusted drive signal output by the logic control unit, use the voltage as the soft start voltage, output the drive signal, turn on the switch module, and complete the soft start of the fuse protector.

2. The fuse protector according to claim 1, characterized in that: When the monitoring voltage does not meet the first condition, the logic control unit is also used to generate and output a first adjustment signal when the monitoring voltage is less than the lower limit threshold of the loop voltage; and to generate and output a second adjustment signal when the monitoring voltage is greater than the upper limit threshold of the loop voltage.

3. The fuse protector according to claim 2, characterized in that: The logic control unit is further used to respond to the first adjustment signal and gradually increase the voltage of the drive signal with a preset first step voltage according to the cycle of the drive signal until the acquired monitoring voltage is greater than or equal to the loop voltage lower limit threshold; And, in response to the second adjustment signal, the voltage of the drive signal is gradually reduced with a preset second step voltage according to the period of the drive signal until the acquired monitoring voltage is less than or equal to the loop voltage upper limit threshold.

4. The fuse protector according to claim 1, characterized in that: The logic control unit is also used to exit the detection phase and automatically enter the soft start phase when the number of times the voltage of the driving signal is adjusted according to a preset rule reaches a threshold of the number of adjustments.

5. The fuse protector according to claim 1, characterized in that: The logic control unit is also used to exit the detection phase and automatically enter the soft start phase when the acquired monitoring voltage does not satisfy the first condition after adjusting the voltage of the driving signal according to a preset rule.

6. The fuse protector according to claim 4 or 5, characterized in that: After exiting the detection phase and automatically entering the soft start phase, the logic control unit is also used to determine the soft start voltage of the drive signal generated after entering the soft start phase based on the relationship between the monitoring voltage and the loop voltage lower limit threshold and the loop voltage upper limit threshold.

7. The fuse protector according to claim 6, characterized in that: The logic control unit determines the soft start voltage of the driving signal generated after entering the soft start phase according to the relationship between the monitoring voltage and the loop voltage lower limit threshold and the loop voltage upper limit threshold, including: After adjusting the voltage of the driving signal for multiple times, when the acquired monitoring voltage is always less than the loop voltage lower limit threshold or greater than the loop voltage upper limit threshold, the voltage at which the monitoring voltage is less than the loop voltage lower limit threshold for the last time is used as the soft start voltage; Or, after adjusting the voltage of the driving signal for multiple times, the acquired monitoring voltage is always less than the loop voltage lower limit threshold, and the adjusted voltage has reached the preset driving voltage threshold, and the last adjusted voltage is used as the soft start voltage.

8. The fuse protector according to claim 1, characterized in that: The driving control unit is also used to set the on-time and period of the driving signal.

9. The fuse protector according to claim 8, characterized in that: In the detection phase and the soft start phase, the on time and the period of the driving signal are different.

10. A soft start control method for a fuse protector, characterized in that: The soft start of the fuse protector includes a detection phase and a soft start phase; the method includes: Obtaining a monitoring current of the circuit where the fuse protector is located, and converting the monitoring current into a monitoring voltage; Comparing and determining whether the monitoring voltage satisfies a first condition; wherein the first condition is that the monitoring voltage is greater than or equal to a preset loop voltage lower limit threshold, and less than or equal to a preset loop voltage upper limit threshold; In the detection stage, when the monitoring voltage does not meet the first condition, the voltage of the driving signal for driving the soft start of the fuse protector is adjusted according to a preset rule until the monitoring voltage meets the first condition; wherein the preset rule includes gradually increasing the voltage of the driving signal with a preset first step voltage according to the cycle of the driving signal; or, gradually reducing the voltage of the driving signal with a preset second step voltage according to the cycle of the driving signal; When the monitoring voltage satisfies the first condition, exiting the detection phase, entering the soft start phase, and outputting the adjusted voltage of the driving signal; In the soft start phase, the adjusted voltage of the driving signal is used as the soft start voltage to drive the fuse protector to achieve soft start.

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