Control circuit and control device

Abstract

The application provides a control circuit and a control device. The control circuit comprises: a current sampling module, which is connected to both ends of a shunt to collect a first voltage signal on the shunt; an amplification module, which is used for amplifying the first voltage signal to obtain a second voltage signal and transmitting the second voltage signal to a signal processing module; the signal processing module is used for generating a corresponding first target control signal or a second target control signal according to the second voltage signal and a first reference voltage signal or a second reference voltage signal, and outputting the first target control signal or the second target control signal to a driving module; the driving module is used for generating a driving signal according to the first target control signal or the second target control signal, and outputting the driving signal to an ignition device, wherein the driving signal is used for driving the ignition device to ignite an explosion device in an intelligent fuse. In this way, the control mode for the ignition device is increased, so that the intelligent fuse can adapt to complex environments.

Description

Technical Field

[0001] This application belongs to the field of intelligent fuse control technology, specifically relating to a control circuit and control device. Background Technology

[0002] Currently, with the rapid development of new energy vehicles, energy storage power stations, and high-voltage industrial equipment, the safety protection requirements for high-voltage, high-current circuit systems are becoming increasingly stringent. These systems must reliably disconnect the circuit within milliseconds in extreme fault scenarios such as short circuits, collisions, and thermal runaway to avoid serious consequences such as battery fires, equipment damage, and even personal injury. Traditional mechanical fuses rely on the thermal melting principle of the fusible element, resulting in response times of tens of milliseconds, and cannot adapt to dynamically changing fault scenarios. Ordinary electronic switches (such as IGBTs and power MOSFETs) are limited by conduction losses and arc-extinguishing capabilities, making it difficult to meet the rapid disconnection requirements under high-voltage, high-current conditions.

[0003] Against this backdrop, the PyroFuse, an intelligent fuse with an integrated ignition tube, emerged. Its core mechanism uses the ignition tube to trigger the combustion of pyrotechnic agents, generating high-pressure gas that drives a mechanical structure to rapidly cut off the main circuit. The response time can be compressed to 0.5-5ms, making it the last line of defense in high-voltage systems. The control performance of the ignition tube directly determines the cutting reliability, response speed, and safety redundancy of the intelligent fuse, making it one of the core technologies in intelligent fuse design. The existing ignition tube control scheme has initially achieved the basic function of "detection-trigger-execution", but the existing ignition tube control scheme cannot achieve ignition control under different current thresholds, which makes the smart fuse unable to adapt to complex environments. Summary of the Invention

[0004] This application provides a control circuit and control device to increase the control methods for ignition devices, enabling smart fuses to adapt to complex environments.

[0005] In a first aspect, this application provides a control circuit, characterized in that it is applied to a smart fuse and used to control the ignition device in the smart fuse based on the current value across the shunt in the smart fuse; the control circuit includes a current sampling module, an amplification module, a signal processing module, and a driving module: The current sampling module is used to connect to both ends of the shunt to collect the first voltage signal on the shunt; The amplification module is used to amplify the first voltage signal to obtain a second voltage signal, and transmit the second voltage signal to the signal processing module; The signal processing module is configured to generate a corresponding first target control signal based on the second voltage signal and the first reference voltage signal, and output the first target control signal to the driving module; or, generate a corresponding second target control signal based on the second voltage signal and the second reference voltage signal, and output the second target control signal to the driving module. The drive module is configured to generate a drive signal based on the first target control signal or the second target control signal, and output the drive signal to the ignition device. The drive signal is used to drive the ignition device to ignite the explosive device in the smart fuse.

[0006] In conjunction with the first aspect, in one possible embodiment, the amplification module includes a differential amplification unit and a first isolation transmission unit: the differential amplification unit is used to amplify the first voltage signal to obtain the second voltage signal, and then output the second voltage signal to the first isolation transmission unit; the first isolation transmission unit is used to isolate and transmit the second voltage signal to the signal processing module.

[0007] In conjunction with the first aspect, in one possible embodiment, the signal processing module includes a voltage comparison unit, a timing unit, and a control unit: the voltage comparison unit is configured to compare the second voltage signal with a first reference voltage signal and a second reference voltage signal; when the second voltage signal is greater than the first reference voltage signal, it outputs a timing signal to the timing unit; and when the second voltage signal is greater than the second reference voltage signal, it outputs a second start signal to the timing unit; the timing unit is configured to start timing upon receiving the timing signal and output a first start signal to the control unit when the timing reaches a preset threshold; the control unit is configured to generate a first target control signal based on the first start signal and output the first target control signal to the drive module; or, generate a second target control signal based on the second start signal and output the second target control signal to the drive module.

[0008] In conjunction with the first aspect, in one possible embodiment, the drive module includes a second isolation transmission unit and a drive unit: the second isolation transmission unit is used to transmit the target control signal to the drive unit in isolation; the drive unit is used to generate a drive signal according to the target control signal and output the drive signal to the ignition device.

[0009] In conjunction with the first aspect, in one possible embodiment, the differential amplification unit includes a differential amplifier, a first resistor, a second resistor, a first capacitor, and a second capacitor; the first isolation transmission unit includes a first isolation transmission chip, a third resistor, a fourth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a seventh capacitor; the first power supply terminal of the differential amplifier is connected to the first terminal of the first capacitor and is used to input a first power supply voltage; the first differential input terminal and the second differential input terminal of the differential amplifier are respectively connected to the two ends of the shunt and are used to input the first voltage value collected by the current sampling module; the output terminal of the differential amplifier is connected to the first terminal of the first resistor and the first terminal of the second capacitor, and the second terminal of the first resistor is connected to the first terminal of the second resistor and the first isolation input terminal of the first isolation transmission chip; the first reference pin of the differential amplifier, the second terminal of the first capacitor, and the second capacitor... The second terminal of the capacitor and the second terminal of the second resistor are both grounded; the second power supply terminal of the first isolated transmission chip is connected to the first terminal of the third capacitor and is used to access the first power supply voltage; the second terminal of the third capacitor is connected to the first terminal of the fourth capacitor, and the second terminal of the fourth capacitor and the second isolated input terminal of the first isolated transmission chip are grounded; the third power supply terminal of the first isolated transmission chip is connected to the first terminal of the fifth capacitor and is used to access the first power supply voltage; the second terminal of the fifth capacitor is connected to the first terminal of the sixth capacitor, and the second terminal of the sixth capacitor is grounded; the first output terminal of the first isolated transmission chip is connected to the first terminal of the third resistor, the first output terminal of the first isolated transmission chip is connected to the first terminal of the fourth resistor, the second terminals of the third resistor and the fourth resistor are both connected to the first terminal of the seventh capacitor and the signal processing module, and the second terminal of the seventh capacitor is grounded.

[0010] In conjunction with the first aspect, in one possible embodiment, the voltage comparison unit includes a voltage comparator, the timing unit includes a timer, and the control unit includes an AND gate and a fifth resistor; the fourth power supply terminal of the voltage comparator is used to connect to a first power supply voltage; the voltage comparator includes a first channel and a second channel; the first comparison input terminal of the first channel is used to connect to a first reference voltage signal; the second comparison input terminal of the first channel is connected to the output terminal of the amplification module and is used to input a second voltage signal output by the amplification module; the first comparison output terminal of the first channel is connected to the trigger terminal and the reset terminal of the timer; the third comparison input terminal of the second channel is used to input the second reference voltage signal, and the fourth comparison input terminal of the second channel is grounded; the second comparison output terminal of the second channel is connected to the second logic input terminal of the AND gate; the first logic output terminal of the AND gate is connected to the first terminal of the fifth resistor, and the second terminal of the fifth resistor is connected to the driving module; the fifth power supply terminal of the timer is used to connect to the first power supply voltage; and the timing output terminal of the timer is connected to the first logic input terminal of the AND gate.

[0011] In conjunction with the first aspect, in one possible embodiment, the second isolated transmission unit includes a second isolated transmission chip and a first isolated power supply chip, the driving unit includes a first transistor, the third isolated input terminal of the second isolated transmission chip is connected to the signal processing module, the first isolated output terminal of the second isolated transmission chip is connected to the first control terminal of the first transistor, the sixth power supply terminal of the second isolated transmission chip is connected to the first power supply output terminal of the first isolated power supply chip and the first conduction terminal of the first transistor, the second conduction terminal of the first transistor is connected to the ignition device; the seventh power supply terminal of the first isolated power supply chip is used to connect to the first power supply voltage.

[0012] In conjunction with the first aspect, in one possible embodiment, a power supply module is further included, which is used to convert the third power supply voltage into a first power supply voltage and output the first power supply voltage to the current sampling module, amplification module, signal processing module and driving module.

[0013] In conjunction with the first aspect, in one possible embodiment, the power supply module includes a second isolated power chip and a voltage regulator; the eighth power supply terminal of the second isolated power chip is connected to the second control terminal of the second isolated power chip and is used to receive a third power supply voltage; the second isolated power chip is used to convert the third power supply voltage into a fourth power supply voltage and output the third power supply voltage to the ninth power supply terminal of the voltage regulator through the second power supply output terminal; the third power supply output terminal of the voltage regulator is used to output a first power supply voltage obtained by converting the fourth power supply voltage to the current sampling module, the amplification module, the signal processing module, and the driving module.

[0014] Secondly, this application provides a control device, including the control circuit and substrate described in the first aspect, wherein the control circuit is disposed on the substrate.

[0015] As can be seen, in this application, the control circuit first includes: a current sampling module, used to connect to both ends of the shunt to collect a first voltage signal on the shunt; an amplification module, used to amplify the first voltage signal to obtain a second voltage signal, and transmit the second voltage signal to the signal processing module; a signal processing module, used to generate a corresponding first target control signal or second target control signal based on the second voltage signal and the first reference voltage signal or the second reference voltage signal, and output the first target control signal or the second target control signal to the drive module; and a drive module, used to generate a drive signal based on the first target control signal or the second target control signal, and output the drive signal to the ignition device, the drive signal being used to drive the ignition device to ignite the explosive device in the smart fuse. In this way, by adding a control method for the ignition device, the smart fuse can achieve different ignition device control for different current thresholds, thereby adapting to complex environments. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural block diagram of the first control circuit provided in the embodiments of this application; Figure 2 This is a structural block diagram of the second control circuit provided in the embodiments of this application; Figure 3 This is a structural block diagram of the third control circuit provided in the embodiments of this application; Figure 4 This is a structural block diagram of the fourth control circuit provided in the embodiments of this application; Figure 5 This is a structural block diagram of the fifth control circuit provided in the embodiments of this application; Figure 6 This is a circuit diagram of the control circuit provided in the embodiments of this application. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0019] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, systems, products, or apparatuses.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] Currently, existing ignition tube control schemes have initially achieved the basic functions of "detection-trigger-execution". However, the existing ignition tube control schemes cannot achieve ignition control under different current thresholds, which makes smart fuses unable to adapt to complex environments.

[0022] To address the aforementioned issues, this application provides a control circuit. This control circuit can be applied to scenarios involving the control of an ignition device in a smart fuse. Specifically, the control circuit includes: a current sampling module for connecting to both ends of a shunt to acquire a first voltage signal on the shunt; an amplification module for amplifying the first voltage signal to obtain a second voltage signal and transmitting the second voltage signal to a signal processing module; a signal processing module for generating a corresponding first target control signal or second target control signal based on the second voltage signal and a first or second reference voltage signal, and outputting the first or second target control signal to a drive module; and a drive module for generating a drive signal based on the first or second target control signal and outputting the drive signal to the ignition device, which drives the ignition device to ignite the explosive device in the smart fuse. This adds a control method for the ignition device, enabling the smart fuse to achieve different ignition device controls for different current thresholds, thus adapting to complex environments. This solution is applicable to various scenarios, including but not limited to the applications mentioned above.

[0023] The specific structure will be described in detail below.

[0024] Please see Figures 1 to 6 This application also provides a control circuit 100 applied to a smart fuse 200, used to control the ignition device 210 in the smart fuse 200 according to the current value across the shunt in the smart fuse 200; the control circuit 100 includes a current sampling module 110, an amplification module 120, a signal processing module 130, and a drive module 140: the current sampling module 110 is used to connect to the two ends of the shunt to collect a first voltage signal on the shunt; the amplification module 120 is used to amplify the first voltage signal to obtain a second voltage signal, and transmit the second voltage signal to the signal processing module 130. Two voltage signals; the signal processing module 130 is used to generate a corresponding first target control signal based on the second voltage signal and the first reference voltage signal, and output the first target control signal to the drive module 140; or, it generates a corresponding second target control signal based on the second voltage signal and the second reference voltage signal, and outputs the second target control signal to the drive module 140; the drive module 140 is used to generate a drive signal based on the first target control signal or the second target control signal, and outputs the drive signal to the ignition device 210, the drive signal being used to drive the ignition device 210 to ignite the explosive device 220 in the smart fuse 200.

[0025] For specific implementation details, please refer to [link / reference]. Figure 1The control circuit 100 is installed in the intelligent fuse 200. When the control circuit 100 is working, the current flows from the first end of the shunt RSHUNT through the second end. The control circuit 100 is connected to the two ends of the shunt RSHUNT respectively to collect the first voltage signal at the two ends of the shunt RSHUNT. After acquiring the first voltage signal, the control circuit 100 first amplifies the millivolt-level voltage signal (i.e., the first voltage signal) on both sides of the shunt RSHUNT through the amplification module 120 to obtain the second voltage signal. Then, the signal with positive and negative directions is shaped and filtered to obtain a single-direction signal. The second voltage signal is compared with the set voltage threshold (i.e., the first reference voltage signal and the second reference voltage signal) through the comparison module. Finally, the corresponding first target control signal or second target control signal is output according to the comparison result. The corresponding drive signal is generated according to the first target control signal or the second target control signal to realize the drive control of the ignition device 210, so as to control the ignition device 210 to ignite the gunpowder in the explosive device 220, thereby detonating the gunpowder inside the explosive device 220. This generates high-pressure gas, which pushes the breaking member downward to cut off the weak point on the shunt RSHUNT. It is understood that the ignition device 210 and the explosion device 220 can be connected separately, or they can be integrated into one device. There is no unique limitation here. This embodiment aims to introduce the principle and implementation of the control circuit 100.

[0026] Optionally, the signal processing module 130 is provided with at least two reference signals, such as a first reference voltage signal and a second reference voltage signal. The two signals are of different magnitudes, with the first reference voltage signal being smaller than the second reference voltage signal, corresponding to two control methods. When the second voltage signal is greater than the first reference voltage signal but less than the second reference voltage signal, the first control operation is executed, such as delayed trigger control, or continuous trigger control based on the signal. When the second voltage signal is less than the second reference voltage signal, the second control operation is executed, such as immediate trigger control of the ignition device 210.

[0027] As can be seen, in this embodiment, by setting at least two reference signals in the signal processing module 130 to compare with the acquired detection signal, and configuring different control methods according to the comparison results, the control methods for the ignition device 210 are increased, so that the smart fuse 200 can achieve different ignition device 210 control for different current thresholds, thereby adapting to complex environments.

[0028] In one possible embodiment, the current sampling module 110 includes a shunt, a sixth resistor R6, and an eighth capacitor C8. The first end of the sixth resistor R6 is connected to the first end of the shunt and the amplification module 120. The second end of the sixth resistor R6 is connected to the first end of the eighth capacitor C8. The second end of the eighth capacitor C8 is connected to the second end of the shunt and the amplification module 120.

[0029] In the specific implementation, the current sampling module 110 converts the large current in the main circuit into a measurable mV-level voltage signal through the shunt RSHUNT. At the same time, the sixth resistor R6 and the eighth capacitor C8 are set to form an RC filter circuit. The sampling signal at both ends of the shunt RSHUNT is filtered by the RC filter circuit to remove high-frequency noise and obtain the first voltage signal, which is then output to the amplification module 120.

[0030] As can be seen, in this embodiment, the sampling signals at both ends of the shunt are filtered by the RC filter circuit to remove high-frequency noise (such as switching interference and electromagnetic radiation) to avoid false triggering caused by sampling fluctuations.

[0031] In one possible embodiment, please refer to Figure 3 and Figure 6 The amplification module 120 includes a differential amplification unit 121 and a first isolation transmission unit 122: the differential amplification unit 121 is used to amplify the first voltage signal to obtain the second voltage signal, and then output the second voltage signal to the first isolation transmission unit 122; the first isolation transmission unit 122 is used to isolate and transmit the second voltage signal to the signal processing module 130.

[0032] In the specific implementation, since the acquisition module acquires the signals at both ends of the shunt, the acquired signal is a differential signal. Therefore, in this embodiment, a differential amplification unit 121 is set up. The acquired differential signal is connected through the differential amplification unit 121, and then the first voltage signal is amplified into a second voltage signal.

[0033] Optionally, the first voltage signal is a millivolt-level voltage. The differential amplification signal can generally amplify this millivolt-level voltage signal by 100 times to obtain a voltage close to the volt level, which is easier for subsequent circuits to identify and process, while improving the signal's anti-interference capability.

[0034] Furthermore, after signal amplification is completed, in this embodiment, the signal is transmitted to the signal processing module 130 through the first isolation transmission unit 122, and the amplified second voltage signal is isolated and transmitted from the "high voltage sampling side" to the "low voltage control side" with an isolation voltage of 2500Vrms. This blocks the high voltage noise of the main circuit from entering the control circuit 100, thereby achieving high and low voltage isolation and further reducing the interference of the high voltage side to the low voltage side.

[0035] For details, please refer to Figure 6 The differential amplifier unit 121 includes a differential amplifier U2, a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2; the first isolation transmission unit 122 includes a first isolation transmission chip U3, a third resistor R3, a fourth resistor R4, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, and a seventh capacitor C7; the first power supply terminal of the differential amplifier U2 is connected to the first terminal of the first capacitor C1 and is used to input a first power supply voltage; the first differential input terminal and the second differential input terminal of the differential amplifier U2 are respectively connected to the two ends of the shunt RSHUNT and are used to input the first voltage value collected by the current sampling module 110; the output terminal of the differential amplifier U2 is connected to the first terminal of the first resistor R1 and the first terminal of the second capacitor C2, and the second terminal of the first resistor R1 is connected to the first terminal of the second resistor R2 and the first isolation input terminal of the first isolation transmission chip U3; the first reference pin of the differential amplifier U2, the second terminal of the first capacitor C1, the third resistor R2, the fourth resistor R2, the fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7; The second terminals of capacitor C2 and resistor R2 are both grounded; the second power supply terminal of the first isolation transmission chip U3 is connected to the first terminal of the third capacitor C3 and is used to access the first power supply voltage; the second terminal of the third capacitor C3 is connected to the first terminal of the fourth capacitor C4, and the second terminal of the fourth capacitor C4 and the second isolation input terminal of the first isolation transmission chip U3 are grounded; the third power supply terminal of the first isolation transmission chip U3 is connected to the first terminal of the fifth capacitor C5 and is used to access the first power supply voltage; the second terminal of the fifth capacitor C5 is connected to the first terminal of the sixth capacitor C6, and the second terminal of the sixth capacitor C6 is grounded; the first output terminal of the first isolation transmission chip is connected to the first terminal of the third resistor R3, and the first output terminal of the first isolation transmission chip is connected to the first terminal of the fourth resistor R4; the second terminals of the third resistor R3 and the fourth resistor R4 are both connected to the first terminal of the seventh capacitor C7 and the signal processing module 130, and the second terminal of the seventh capacitor C7 is grounded.

[0036] In one possible embodiment, please refer to Figure 4 and Figure 6The signal processing module 130 includes a voltage comparison unit 132, a timing unit 131, and a control unit 133. The voltage comparison unit 132 is used to compare the second voltage signal with the first reference voltage signal and the second reference voltage signal. When the second voltage signal is greater than the first reference voltage signal, it outputs a timing signal to the timing unit 131. When the second voltage signal is greater than the second reference voltage signal, it outputs a second start signal to the timing unit 131. The timing unit 131 is used to start timing when it receives the timing signal and outputs a first start signal to the control unit 133 when the timing reaches a preset threshold. The control unit 133 is used to generate a first target control signal according to the first start signal and output the first target control signal to the drive module 140; or, it generates a second target control signal according to the second start signal and outputs the second target control signal to the drive module 140.

[0037] Specifically, the voltage comparison unit 132 includes a voltage comparator U5, the timing unit 131 includes a timer U4, and the control unit includes an AND gate U6 and a fifth resistor R5; the fourth power supply terminal of the voltage comparator U5 is used to connect to a first power supply voltage; the voltage comparator U5 includes a first channel and a second channel; the first comparison input terminal of the first channel (i.e., the non-inverting input terminal of the first channel) is used to connect to a first reference voltage signal; the second comparison input terminal of the first channel (i.e., the inverting input terminal of the first channel) is connected to the output terminal of the amplification module 120 and is used to input the second voltage signal output by the amplification module 120; the first comparison output of the first channel... The second channel's third comparison input (i.e., the non-inverting input) is used to input the second reference voltage signal, and the second comparison input (i.e., the inverting input) is grounded; the second comparison output is connected to the second logic input of the AND gate U6; the first logic output is connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is connected to the driver module 140; the fifth power supply terminal of the timer U4 is used to connect to the first power supply voltage; and the timing output is connected to the first logic input of the AND gate U6.

[0038] Specifically, the voltage comparison unit 132 further includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, and a twelfth capacitor C12; the first comparison input terminal of the first channel is connected to the first terminal of the seventh resistor R7, the first terminal of the eighth resistor R8, and the first terminal of the ninth capacitor C9; the second terminal of the seventh resistor R7 is used to connect to the first supply voltage; the second terminals of the eighth resistor R8 and the second terminals of the ninth capacitor C9 are both grounded; the first comparison output terminal of the first channel is connected to the first terminal of the ninth resistor R9. The first terminal of the tenth capacitor C10, the trigger terminal and the reset terminal of the timer U4; the third comparison input terminal of the second channel is connected to the first terminal of the tenth resistor R10 and the first terminal of the eleventh resistor R11; the second terminal of the tenth resistor R10 is connected to the fourth power supply terminal of the voltage comparator U5, one terminal of the eleventh capacitor C11 and the first terminal of the twelfth resistor R12, and is connected to the first power supply voltage; the second terminal of the twelfth resistor R12 is connected to the first terminal of the twelfth capacitor C12; the second terminals of the tenth capacitor C10, the eleventh capacitor C11, the eleventh resistor R11 and the twelfth capacitor C12 are all grounded.

[0039] In this embodiment, a first reference voltage signal is obtained by dividing the first supply voltage using the eighth resistor R8 and the ninth resistor R9. This signal is then input to the first comparison input terminal of the first channel and compared with the second voltage signal to obtain a first comparison result. The first comparison result is then output to the timer U4 via the first comparison output terminal. The ninth capacitor C9 filters the first reference voltage signal, removing high-frequency signals and improving its stability. Furthermore, a second reference voltage signal is obtained by dividing the first supply voltage using the tenth resistor R10 and the eleventh resistor R11. This signal is output to the third comparison input terminal of the second channel and compared with the second voltage signal to obtain a second comparison result (i.e., a second start signal). The second comparison result is then output to the second logic input terminal of the AND gate U6 in the control unit 133 via the second comparison output terminal.

[0040] Furthermore, the timing unit 131 also includes a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, and a first transistor Q1; the fifth power supply terminal of the timer U4 is connected to the first terminal of the thirteenth capacitor C13 and connected to a first power supply voltage; the discharge control terminal of the timer U4 is connected to the first terminal of the thirteenth resistor R13; the second terminal of the thirteenth resistor R13 is connected to the first terminal of the fourteenth capacitor C14 and the fifth comparison input terminal of the timer U4; and the timing output terminal of the timer U4 is connected to the fourteenth resistor R14. The first end of resistor R14 and the second end of the fourteenth resistor R14 are connected to the base of the first transistor Q1. The collector of the first transistor Q1 is connected to the first end of the fifteenth resistor R15 and the first logic input of the AND gate U6. The second end of the fifteenth resistor R15 is used to connect to the first power supply voltage. The voltage control pin of the timer U4 is connected to the first end of the fifteenth capacitor C15. The ground terminal of the timer U4, the emitter of the first transistor Q1, the second end of the thirteenth capacitor C13, the second end of the fourteenth capacitor, and the second end of the fifteenth capacitor C15 are all grounded.

[0041] In this embodiment, the first comparison output terminal of the first channel outputs the first comparison result to the trigger terminal and the reset terminal of the timer U4. When the first comparison result is at the first level, the timing function of the timer U4 is triggered and the timer U4 starts timing. If the first comparison result continues to maintain the first level, the timing continues until the preset threshold is reached. The timer U4 outputs the first control signal to the first transistor Q1 through the timing output terminal to turn on the first transistor Q1, and then outputs the first start signal to the logic AND gate U6.

[0042] Furthermore, the control unit 133 also includes a sixteenth capacitor C16. The eighth power supply terminal of the AND gate U6 is connected to the first terminal of the sixteenth capacitor C16 and connected to the first power supply voltage. The second terminal of the sixteenth capacitor C16 and the ground terminal of the AND gate U6 are both grounded.

[0043] In this embodiment, the first and second logic input terminals of the AND gate U6 are respectively input with a first start signal and a second start signal. An AND operation is performed on the first start signal and the second cut-off signal, and the result is output to the drive module 140. Specifically, the result includes a start control signal (such as a first target control signal and a second target control signal) and a stop control signal. The start control signal is generated when the current in the main circuit is continuously greater than a first current threshold exceeding a preset threshold or greater than a second current threshold. It is used to instruct the drive module 140 to output a drive signal to drive the ignition device 210 to ignite the explosive device 220 and thus cut off the circuit. The stop control signal is generated when the current in the main circuit is less than or equal to the first current threshold or when the current in the main circuit is less than the second current threshold and the duration of the current exceeding the first current threshold does not exceed a preset threshold. It is used to instruct the drive module 140 to output a stop signal so that the ignition device 210 is not triggered.

[0044] In its implementation, voltage comparator U5 includes a first channel and a second channel. The first channel (first current threshold, e.g., 3100A): the non-inverting input is connected to the output of an analog isolation amplifier, and the inverting input is connected to a 0.93V reference voltage obtained by a 5V voltage divider. When the sampled voltage > 0.93V (current > 3100A), OUTA outputs a low level, triggering the precision timer U4. The second channel (second current threshold, e.g., 10000A): the non-inverting input is connected to the output of an analog isolation amplifier, and the inverting input is connected to a 3.0V reference voltage obtained by a 5V voltage divider. When the sampled voltage > 3.0V (current > 10000A), OUTB outputs a low level, directly triggering the AND gate U6.

[0045] Timer U4 forms a monostable multivibrator, with its trigger terminal (TRIG) connected to voltage comparator U5OUTA. When OUTA outputs a low level, timer U4 is triggered, and its output terminal (OUT) outputs a high level for 10ms (the time constant is determined by the RC circuit, thus achieving 10ms timing). If the current drops below 3100A within 10ms (OUTA outputs a high level), timer U4 is reset, and the timing is cleared; if the current is still greater than 3100A after 10ms, the output of timer U4 remains high.

[0046] Select the dual-input AND gate U6. Input 1 is connected to timer U4OUT (10ms timing signal), and input 2 is connected to voltage comparator U5OUTA (3100A overcurrent signal). Voltage comparator U5OUTB (10000A overcurrent signal) is also connected as a redundant trigger. When "current > 3100A for 10ms" or "current > 10000A", the AND gate outputs a low level, triggering the subsequent isolated driver module 140.

[0047] As can be seen, in this embodiment, the signal processing module 130 serves as the "decision center" of the control circuit 100, realizing overcurrent threshold judgment, delay / immediate trigger logic integration, delay triggering when the current does not exceed the rated current by too much, immediate triggering when the current exceeds the rated current by a large amount, and protection against false triggering.

[0048] In one possible embodiment, please refer to Figure 5 and Figure 6 The drive module 140 includes a second isolation transmission unit 141 and a drive unit 142: the second isolation transmission unit 141 is used to isolate and transmit the target control signal to the drive unit 142; the drive unit 142 is used to generate a drive signal according to the target control signal and output the drive signal to the ignition device 210.

[0049] Specifically, the second isolated transmission unit 141 includes a second isolated transmission chip U7 and a first isolated power supply chip U8, the driving unit 142 includes a first transistor M1, the third isolated input terminal of the second isolated transmission chip U7 is connected to the signal processing module (specifically the second end of the fifth resistor R5), the first isolated output terminal of the second isolated transmission chip U7 is connected to the first control terminal of the first transistor M1, the sixth power supply terminal of the second isolated transmission chip U7 is connected to the first power supply output terminal of the first isolated power supply chip U8 and the first conducting terminal of the first transistor M1, and the second conducting terminal of the first transistor M1 is connected to the ignition device 210; the seventh power supply terminal of the first isolated power supply chip U8 is used to connect to the first power supply voltage.

[0050] Furthermore, the second isolation transmission unit 141 also includes a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20, and a sixteenth resistor R16; even further, the driving unit 142 also includes a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, and a twentieth resistor R20.

[0051] The first terminal of the seventeenth capacitor C17 is connected to the sixth power supply terminal of the second isolation transmission chip U7, and the second terminal of the seventeenth capacitor C17 and the ground terminal of the second isolation transmission chip U7 are both grounded; the first isolation output terminal of the second isolation transmission chip U7 is connected to the first terminal of the sixteenth resistor R16 and the first terminal of the eighteenth resistor R18; the sixteenth resistor R16 is connected to the seventh power supply terminal of the first isolation power chip U8 and the first terminal of the twentieth capacitor C20, and is connected to the first power supply voltage; the second terminal of the twentieth capacitor C20 and the ground terminal of the first isolation transmission chip U3 are both grounded; the first power supply output terminal of the first isolation power chip U8 is connected to the first terminal of the eighteenth capacitor C18 and the first terminal of the seventeenth resistor R17. The first conducting terminal (i.e., source) of the first transistor M1 and the sixth power supply terminal of the second isolation transmission unit 141 are connected. The second terminal of the seventeenth resistor R17 is connected to the second terminal of the eighteenth resistor R18 and the first control terminal of the first transistor M1. The second conducting terminal of the first transistor M1 is connected to the first terminal of the ignition device 210. The second terminal of the ignition device 210 is connected to the first terminal of the nineteenth resistor R19. The second terminal of the nineteenth resistor R19 is connected to the first terminal of the twentieth resistor R20. The second terminal of the eighteenth capacitor C18 is connected to the first terminal of the nineteenth capacitor C19. The second terminal of the nineteenth capacitor C19, the second terminal of the twentieth resistor R20 and the ground terminal of the first isolation power chip U8 are all grounded.

[0052] In its specific implementation, the drive module 140 is mainly used to convert the low-level trigger signal (i.e., the start control signal) output by the signal processing module 130 into a "1.75A / 1ms" high-current drive signal required by the ignition device 210. Specifically, the output of the AND gate U6 drives the input LED of the optocoupler (i.e., the second isolation output unit) through a current-limiting resistor. The optical signal is transmitted to the output side in isolation, and then to the drive unit 142, thereby achieving electrical isolation between the low-voltage control side and the high-voltage drive side.

[0053] In the specific implementation, the first transistor M1 can be a MOSFET, and the second isolation transmission chip U7 can be an optocoupler. When the output of the optocoupler is low, the gate of the P-channel MOSFET is driven by the gate resistor of the first transistor M1, causing the MOSFET to conduct (VGS=-5V). After the MOSFET is turned on, the 5V power supply output from the isolation power supply passes through the drain (D) of the MOSFET, the ignition transistor, the current limiting resistor, and the fuse FUSE to DGND. The ignition transistor receives a pulse current of 1.75A / 1ms, which triggers the internal propellant to explode and generate high-pressure gas, thereby driving the piston to cut off the main circuit.

[0054] As can be seen, in this embodiment, the low-level trigger signal output by the signal processing module 130 is converted into a strong current drive signal required by the ignition device 210 through the second isolation transmission unit 141, while realizing the isolation between the high and low voltage sides and improving the anti-interference capability of the control circuit 100.

[0055] In one possible embodiment, please refer to Figure 2 and Figure 6 The control circuit 100 further includes a power supply module 150, which is used to convert the third power supply voltage into a first power supply voltage and output the first power supply voltage to the current sampling module 110, the amplification module 120, the signal processing module 130 and the driving module 140.

[0056] In a specific implementation, the power supply module 150 converts the voltage of the external power supply into the first power supply voltage required by the various modules and units inside the control circuit 100.

[0057] Specifically, the power supply module 150 includes a second isolated power chip U1 and a voltage regulator LDO; the eighth power supply terminal of the second isolated power chip U1 is connected to the second control terminal of the second isolated power chip U1 and is used to access a third power supply voltage; the second isolated power chip U1 is used to convert the third power supply voltage into a fourth power supply voltage and output the fourth power supply voltage to the ninth power supply terminal of the voltage regulator LDO through the second power supply output terminal; the third power supply output terminal of the voltage regulator LDO is used to output the first power supply voltage obtained by converting the fourth power supply voltage to the current sampling module 110, the amplification module 120, the signal processing module 130, and the driving module 140.

[0058] Furthermore, the power supply module 150 also includes a fuse FUSE, an electrostatic discharge (ESD) protector D1, a 21st capacitor C21, a 22nd capacitor C22, a 23rd capacitor C23, and a 24th capacitor C24; the eighth power supply terminal of the second isolated power supply chip U1 is connected to the first terminal of the fuse FUSE, the first terminal of the ESD protector D1, and the second control terminal of the second isolated power supply chip U1; the second terminal of the fuse FUSE is used to connect to the positive terminal V+ of the target power supply; the second terminal of the ESD protector D1 is connected to the first terminal of the 21st capacitor C21; and the second terminal of the 21st capacitor C21 is connected to the... The first terminal of the 22nd capacitor C22 and the second terminal of the 22nd capacitor C22 are connected to the negative terminal V- of the target power supply and the ground terminal of the second isolation power chip U1. The second power supply output terminal of the second isolation power chip U1 is connected to the first terminal of the 23rd capacitor C23. The second terminal of the 23rd capacitor C23 is connected to the first terminal of the 24th capacitor C24. The second terminal of the 24th capacitor C24 is connected to the third power supply terminal of the voltage regulator LDO. The third power supply terminal of the voltage regulator LDO is connected to the current sampling module 110, the amplification module 120, the signal processing module 130 and the driving module 140 respectively.

[0059] In a specific implementation, the second isolation power chip U1 is connected to an external power supply voltage (i.e., the third power supply voltage), which is converted into a fourth power supply voltage (e.g., 12V). At the same time, the fourth power supply voltage is output to the voltage regulator LDO. Furthermore, the second isolation power chip U1 can be an isolated DC-DC module, which isolates the high-voltage side of the external power supply from the low-voltage side inside the control circuit 100, thereby improving the anti-interference capability of the control circuit 100.

[0060] Then, the voltage regulator LDO reduces and regulates the fourth supply voltage to the first supply voltage (e.g., 5V), thereby providing a stable power supply to all low-voltage chips (differential amplifier U2, first isolation transmission chip U3, voltage comparator U5, timer U4, logic AND gate U6, etc.).

[0061] Finally, the first power supply voltage output simultaneously supplies power to the input side of the first isolation power chip U8, and the first isolation power chip U8 outputs an isolated 5V to supply power to the drive side (PMOS transistor, optocoupler, etc.).

[0062] As can be seen, in this embodiment, the power supply module 150 provides a stable and reliable power supply to the control circuit 100, thereby improving the reliability of the control circuit 100.

[0063] This application also provides a control device, including the control circuit 100 of this application and a substrate, wherein the control circuit 100 is disposed on the substrate.

[0064] It is understood that the control device can be a circuit board, or a module, electronic device, or electronic device that includes a circuit board. Alternatively, the substrate can be used as a circuit board, and the control circuit 100 can be arranged on the substrate to form a circuit board, thus obtaining the known device.

[0065] While this application discloses the above information, it is not limited thereto. Any person skilled in the art can easily conceive of variations or substitutions without departing from the spirit and scope of this application, and can make various alterations and modifications, including combinations of the different functions and implementation steps described above, as well as software and hardware implementation methods, all of which are within the protection scope of this application.

Claims

1. A control circuit, characterized in that, This control circuit is applied to smart fuses and is used to control the ignition device in the smart fuse based on the current value across the shunt in the smart fuse. The control circuit includes a current sampling module, an amplification module, a signal processing module, and a drive module. The current sampling module is used to connect to both ends of the shunt to collect the first voltage signal on the shunt; The amplification module is used to amplify the first voltage signal to obtain a second voltage signal, and transmit the second voltage signal to the signal processing module; The signal processing module is used to generate a corresponding first target control signal based on the second voltage signal and the first reference voltage signal, and to output the first target control signal to the driving module. Alternatively, a corresponding second target control signal is generated based on the second voltage signal and the second reference voltage signal, and the second target control signal is output to the drive module. The drive module is configured to generate a drive signal based on the first target control signal or the second target control signal, and output the drive signal to the ignition device. The drive signal is used to drive the ignition device to ignite the explosive device in the smart fuse.

2. The control circuit according to claim 1, characterized in that, The amplification module includes a differential amplification unit and a first isolation transmission unit: The differential amplifier unit is used to amplify the first voltage signal to obtain the second voltage signal, and then output the second voltage signal to the first isolation transmission unit; The first isolation transmission unit is used to isolate and transmit the second voltage signal to the signal processing module.

3. The control circuit according to claim 1, characterized in that, The signal processing module includes a voltage comparison unit, a timing unit, and a control unit: The voltage comparison unit is used to compare the second voltage signal with the first reference voltage signal and the second reference voltage signal. When the second voltage signal is greater than the first reference voltage signal, it outputs a timing signal to the timing unit. When the second voltage signal is greater than the second reference voltage signal, it outputs a second start signal to the control unit. The timing unit is used to start timing when it receives a timing signal, and to output a first start signal to the control unit when the timing reaches a preset threshold. The control unit is configured to generate the first target control signal according to the first start signal and output the first target control signal to the drive module; or, generate the second target control signal according to the second start signal and output the second target control signal to the drive module.

4. The control circuit according to claim 1, characterized in that, The driving module includes a second isolated transmission unit and a driving unit: The second isolation transmission unit is used to isolate and transmit the target control signal to the drive unit; A drive unit is configured to generate a drive signal based on the target control signal and output the drive signal to the ignition device.

5. The control circuit according to claim 2, characterized in that, The differential amplification unit includes a differential amplifier, a first resistor, a second resistor, a first capacitor, and a second capacitor; the first isolation transmission unit includes a first isolation transmission chip, a third resistor, a fourth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a seventh capacitor. The first power supply terminal of the differential amplifier is connected to the first terminal of the first capacitor and is used to receive the first power supply voltage; the first differential input terminal and the second differential input terminal of the differential amplifier are respectively connected to the two ends of the shunt and are used to receive the first voltage value collected by the current sampling module. The output terminal of the differential amplifier is connected to the first terminal of the first resistor and the first terminal of the second capacitor. The second terminal of the first resistor is connected to the first terminal of the second resistor and the first isolation input terminal of the first isolation transmission chip. The first reference pin of the differential amplifier, the second terminal of the first capacitor, the second terminal of the second capacitor, and the second terminal of the second resistor are all grounded. The second power supply terminal of the first isolated transmission chip is connected to the first terminal of the third capacitor and is used to access the first power supply voltage; the second terminal of the third capacitor is connected to the first terminal of the fourth capacitor, and the second terminal of the fourth capacitor and the second isolated input terminal of the first isolated transmission chip are grounded; the third power supply terminal of the first isolated transmission chip is connected to the first terminal of the fifth capacitor and is used to access the first power supply voltage; the second terminal of the fifth capacitor is connected to the first terminal of the sixth capacitor, and the second terminal of the sixth capacitor is grounded; the first output terminal of the first isolated transmission chip is connected to the first terminal of the third resistor, the first output terminal of the first isolated transmission chip is connected to the first terminal of the fourth resistor, the second terminals of the third resistor and the fourth resistor are both connected to the first terminal of the seventh capacitor and the signal processing module, and the second terminal of the seventh capacitor is grounded.

6. The control circuit according to claim 3, characterized in that, The voltage comparison unit includes a voltage comparator, the timing unit includes a timer, and the control unit includes an AND gate and a fifth resistor; The fourth power supply terminal of the voltage comparator is used to connect to a first power supply voltage; the voltage comparator includes a first channel and a second channel; the first comparison input terminal of the first channel is used to connect to a first reference voltage signal; the second comparison input terminal of the first channel is connected to the output terminal of the amplification module and is used to input a second voltage signal output by the amplification module; the first comparison output terminal of the first channel is connected to the trigger terminal and the reset terminal of the timer; the third comparison input terminal of the second channel is used to input the second reference voltage signal, and the fourth comparison input terminal of the second channel is grounded; the second comparison output terminal of the second channel is connected to the second logic input terminal of the AND gate; the first logic output terminal of the AND gate is connected to the first terminal of the fifth resistor, and the second terminal of the fifth resistor is connected to the driving module; The fifth power supply terminal of the timer is used to connect to the first power supply voltage; the timing output terminal of the timer is connected to the first logic input terminal of the AND gate.

7. The control circuit according to claim 4, characterized in that, The second isolated transmission unit includes a second isolated transmission chip and a first isolated power supply chip, and the driving unit includes a first transistor. The third isolated input terminal of the second isolated transmission chip is connected to the signal processing module, the first isolated output terminal of the second isolated transmission chip is connected to the first control terminal of the first transistor, the sixth power supply terminal of the second isolated transmission chip is connected to the first power supply output terminal of the first isolated power chip and the first conduction terminal of the first transistor, and the second conduction terminal of the first transistor is connected to the ignition device. The seventh power supply terminal of the first isolation power supply chip is used to connect to the first power supply voltage.

8. The control circuit according to any one of claims 1-7, characterized in that, It also includes a power supply module for converting the third power supply voltage into a first power supply voltage and outputting the first power supply voltage to the current sampling module, amplification module, signal processing module and drive module.

9. The control circuit according to claim 8, characterized in that, The power supply module includes a second isolated power chip and a voltage regulator; the eighth power supply terminal of the second isolated power chip is connected to the second control terminal of the second isolated power chip and is used to receive a third power supply voltage. The second isolated power chip is used to convert the third power supply voltage into a fourth power supply voltage and output the fourth power supply voltage to the ninth power supply terminal of the voltage regulator through the second power supply output terminal. The third power supply output terminal of the voltage regulator is used to output a first power supply voltage obtained by converting the fourth power supply voltage to the current sampling module, the amplification module, the signal processing module, and the drive module.

10. A control device, characterized in that, It includes the control circuit and substrate as described in any one of claims 1-9, wherein the control circuit is disposed on the substrate.

Images