Overcurrent protection circuit and circuit board
By designing an overcurrent protection circuit including a control module and a voltage divider module, the problem of overheating near the overcurrent protection point in the prior art is solved, and more efficient overcurrent detection and protection are achieved, and the stability of the circuit is improved.
Patent Information
- Application Number
- CN202421785452.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-07-25
AI Technical Summary
The overcurrent protection points in existing overcurrent protection circuits are prone to overheating, affecting the operation of circuit components and bringing bad experience to users.
An overcurrent protection circuit including a control module, a first voltage adjustment module, a first voltage divider module, a first switching module, a second voltage divider module, a voltage output module and a first load module are designed. When the control module detects the overcurrent detection condition, the first voltage adjustment module increases the voltage value of the first voltage divider module, switches the first switching module to the on state, and the second voltage divider module is connected in parallel with the first load module to amplify the current value for overcurrent protection.
The sensitivity and response speed of overcurrent detection are improved, the accuracy of overcurrent protection is enhanced, the overheating problem caused by the constant amplification of the overcurrent protection point current is avoided, and the operating stability of the circuit is improved.
Smart Images
Figure CN223039631U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of protection circuits, and in particular, to an overcurrent protection circuit and a circuit board. Background Art
[0002] An overcurrent protection point is provided in the overcurrent protection circuit. The control module samples the current value of the overcurrent protection point and detects whether the current of the overcurrent protection point exceeds a preset current value. When it is detected that the current of the overcurrent protection point exceeds the preset current value, it is determined that an overcurrent situation occurs in the overcurrent protection circuit, and overcurrent protection is performed on the overcurrent protection circuit to prevent components in the circuit from being damaged due to overload.
[0003] However, there are some problems in the above overcurrent protection circuit. For example, it is easy to overheat near the overcurrent protection point, which affects the operation of components in the circuit and brings a bad experience to users. Summary of the Utility Model
[0004] An embodiment of this application provides an overcurrent protection circuit and a circuit board, which can perform overcurrent protection on the circuit. The technical solution is as follows:
[0005] In a first aspect, an embodiment of this application provides an overcurrent protection circuit, and the circuit includes:
[0006] A control module, a first voltage adjustment module, a first voltage division module, a first switch module, a second voltage division module, a voltage output module, and a first load module;
[0007] The first output end of the control module is electrically connected to the input end of the first voltage adjustment module. The output end of the first voltage adjustment module is respectively electrically connected to the first input end of the first switch module and the input end of the first voltage division module. The output end of the first voltage division module is electrically connected to the second input end of the first switch module. The output end of the first switch module is electrically connected to the input end of the second voltage division module. The output end of the second voltage division module is electrically connected to the input end of the first load module. The input end of the first load module is respectively electrically connected to the detection end of the control module and the first output end of the voltage output module;
[0008] When the control module detects a first overcurrent detection condition, it adjusts the voltage value of the first voltage division module to exceed a first voltage threshold through the first voltage adjustment module, so that both the first switch module and the second voltage division module are switched to the working state. At this time, the second voltage division module is connected in parallel with the first load module. When the control module detects that the current value at the input end of the first load module exceeds a first current threshold, it performs overcurrent protection on the first load module.
[0009] In a second aspect, an embodiment of the present application provides a circuit board, and the circuit board includes the overcurrent protection circuit described in the first aspect.
[0010] The beneficial effects brought by the technical solutions provided in some embodiments of the present application at least include:
[0011] The overcurrent protection circuit provided by the present application includes a control module, a first voltage adjustment module, a first voltage division module, a first switch module, a second voltage division module, a voltage output module, and a first load module. The overcurrent protection point of the overcurrent protection circuit is the input end of the first load module. When the control module detects a first overcurrent detection condition and energizes the first voltage adjustment module to increase the voltage value corresponding to the first voltage division module until it exceeds the first voltage threshold, the first switch module switches from the off state to the on state. Based on the first switch module switched to the on state, the second voltage division module is connected in parallel with the first load module to amplify the current value at the input end of the first load module. The control module detects whether the amplified current value corresponding to the overcurrent protection point exceeds the first current threshold, thereby performing overcurrent protection on the first load module. In the present application, on the one hand, when detecting an overcurrent detection condition such as circuit startup, the current value at the overcurrent protection point is amplified, which can improve the sensitivity of overcurrent detection, accelerate the response speed of overcurrent protection, and improve the overcurrent protection accuracy; on the other hand, when overcurrent detection is not required, that is, when the overcurrent detection condition is not met, the amplification of the current value at the overcurrent protection point is stopped, so that the first load module receives the working voltage output by the voltage output module to work, avoiding the problem that the first load module overheats or cannot carry a heavy load due to continuously amplifying the current value at the overcurrent protection point, and the working stability of the overcurrent protection circuit is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0013] Figure 1 is a schematic structural diagram of an overcurrent protection circuit provided by an embodiment of the present application;
[0014] Figure 2 is a schematic structural diagram of an overcurrent protection circuit provided by an embodiment of the present application;
[0015] Figure 3 is a schematic structural diagram of an overcurrent protection circuit provided by an embodiment of the present application;
[0016] Figure 4It is a schematic structural diagram of an overcurrent protection circuit provided by an embodiment of the present application;
[0017] Figure 5 It is a schematic structural diagram of an overcurrent protection circuit provided by an embodiment of the present application. Detailed implementation manners
[0018] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.
[0019] In the description of the present application, it should be understood that terms such as "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In the description of the present application, it should be noted that unless otherwise clearly specified and limited, "including" and "having", and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood in specific situations. In addition, in the description of the present application, unless otherwise stated, "a plurality" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.
[0020] The present application will be described in detail below in conjunction with specific embodiments.
[0021] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data for analysis, stored data, displayed data, etc.), and signals involved in the embodiments of this specification are all authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions. For example, the object characteristics, interaction behavior characteristics, and user information involved in this specification are all obtained under full authorization.
[0022] In one embodiment, as Figure 1As shown in the figure, it is a schematic structural diagram of an overcurrent protection circuit provided by an embodiment of the present application. The overcurrent protection circuit includes: a control module 101, a first voltage adjustment module 102, a first voltage division module 103, a first switch module 104, a second voltage division module 105, a voltage output module 106, and a first load module 107.
[0023] The input end of the first load module 107 is electrically connected to the first output end of the voltage output module 106, and the first load module 107 receives the working voltage output by the voltage output module 106 to work. The first load module 107 can be any load. For example, the first load module 107 is a charger, which performs voltage conversion and filtering based on the working voltage output by the voltage output module 106, so that the terminal device can be connected to the charger for charging. The voltage output module 106 is used to provide the working voltage.
[0024] The first output end of the control module 101 is electrically connected to the input end of the first voltage adjustment module 102. When the control module 101 detects that the first overcurrent detection condition is met, it energizes the first voltage adjustment module 102. The first voltage adjustment module 102 is in an off state when not energized and in a conducting state during the energization process, so that the first voltage division module 103 receives the control voltage provided by the control module 101.
[0025] The first overcurrent detection condition can be any set condition. For example, the first overcurrent detection condition is the start of the first load module 107. When it is detected that the first load module 107 starts and enters the working state, the control module 101 determines that the first overcurrent detection condition is met and energizes the first voltage adjustment module 102 to start detecting the current value at the input end of the first load module 107. Another example is that the first overcurrent detection condition is that the voltage output module 106 starts to output the working voltage. When it is detected that the voltage output module 106 starts to output the working voltage, the control module 101 determines that the first overcurrent detection condition is met and energizes the first voltage adjustment module 102. Another example is that the first overcurrent detection condition is detecting an overcurrent detection instruction input by the user. When the control module 101 receives this overcurrent detection instruction, it determines that the first overcurrent detection condition is met and energizes the first voltage adjustment module 102.
[0026] The output end of the first voltage adjustment module 102 is respectively electrically connected to the first input end of the first switch module 104 and the input end of the first voltage division module 103. The output end of the first voltage division module 103 is electrically connected to the second input end of the first switch module 104. During the energization process of the first voltage adjustment module 102, when the voltage value corresponding to the first voltage division module 103 gradually rises until it exceeds the first voltage threshold, the first switch module 104 switches from the off state to the conducting state.
[0027] Specifically, during the charging process of the first voltage adjustment module 102, the first voltage dividing module 103 receives the control voltage provided by the control module 101, and the voltage value corresponding to the first voltage dividing module 103 gradually increases until it reaches the first voltage threshold required for the first switching module 104 to switch from the off state to the on state. When the first switching module 104 detects that the voltage value corresponding to the first voltage dividing module 103 exceeds the first voltage threshold based on the second input terminal, it switches from the off state to the on state.
[0028] The output terminal of the first switching module 104 is electrically connected to the input terminal of the second voltage dividing module 105, and the input terminal of the first load module 107 is also electrically connected to the output terminal of the second voltage dividing module 105. The second voltage dividing module 105 is connected in parallel with the first load module 107 based on the first switching module 101 in the on state to amplify the current value at the input terminal of the first load module 107.
[0029] Specifically, when the first switching module 104 is in the off state, the working voltage V0 output by the voltage output module 106, the equivalent resistance R0 of the first load module 107, and the current I0 at the input terminal of the first load module 107 = V0 / R0. When the first switching module 104 switches from the off state to the on state, the second voltage dividing module 105 is connected in parallel with the first load module 107. The resistance of the second voltage dividing module 105 is R2. Therefore, the equivalent resistance after the first load module 107 and the second voltage dividing module 105 are connected in parallel is 1 / R0 + 1 / R2, and this equivalent resistance is less than the equivalent resistance R0 of the first load module 107. Therefore, the current value at the input terminal of the first load module 107 is amplified.
[0030] The detection terminal of the control module 101 is electrically connected to the input terminal of the first load module 107. The control module 101 detects whether the current value at the input terminal of the first load module 107 exceeds the first current threshold, and performs overcurrent protection on the first load module 107 when it detects that the current value at the input terminal of the first load module 107 exceeds the first current threshold.
[0031] The control module 101 detects whether the current value at the input terminal of the amplified first load module 107 exceeds the first current threshold. As described above, the amplification degree of the current value at the input terminal of the first load module 107 is related to the resistance value of the second voltage dividing module 105. The amplification effect of the current value at the input terminal of the first load module 107 can be set by setting the resistance value of the second voltage dividing module 105. When it detects that the current value at the input terminal of the amplified first load module 107 exceeds the first current threshold, it is determined that an overcurrent phenomenon occurs in the overcurrent protection circuit, and overcurrent protection is performed on the first load module 107 by measures such as stopping the first load module 107 or stopping the voltage output module 106.
[0032] Based onFigure 1 The overcurrent protection circuit shown, such as Figure 2 Figure 1 shows a schematic structural diagram of the overcurrent protection circuit implemented in this application. The first switch module 104 includes: a first MOS transistor Q1. The gate of the first MOS transistor Q1 is connected to the output terminal of the first voltage adjustment module 102, the drain of the first MOS transistor Q1 is connected to the input terminal of the second voltage division module 105, and the source of the first MOS transistor Q1 is connected to the output terminal of the first voltage division module 103.
[0033] During the process of the control module 101 charging the first voltage adjustment module 102, the voltage value corresponding to the first voltage division module 103 gradually increases. When the gate voltage of the first MOS transistor Q1 rises to the first voltage threshold, the first MOS transistor Q1 turns on, and the second voltage division module 105 is connected in parallel with the first load module 107 to amplify the current value at the input terminal of the first load module 107. The control module 101 detects whether the amplified current value at the input terminal of the first load module 107 exceeds the first current threshold to perform overcurrent protection on the first load module 107.
[0034] The overcurrent protection circuit provided in this application includes a control module, a first voltage adjustment module, a first voltage division module, a first switch module, a second voltage division module, a voltage output module, and a first load module. The overcurrent protection point of this overcurrent protection circuit is the input terminal of the first load module. When the control module detects the first overcurrent detection condition and charges the first voltage adjustment module to increase the voltage value corresponding to the first voltage division module until it exceeds the first voltage threshold, the first switch module switches from the off state to the on state. Based on the first switch module switched to the on state, the second voltage division module is connected in parallel with the first load module to amplify the current value at the input terminal of the first load module. The control module detects whether the amplified current value corresponding to the overcurrent protection point exceeds the first current threshold, thereby performing overcurrent protection on the first load module. In this application, on the one hand, when detecting overcurrent detection conditions such as circuit startup, the current value at the overcurrent protection point is amplified, which can improve the sensitivity of overcurrent detection, accelerate the response speed of overcurrent protection, and improve the overcurrent protection accuracy; on the other hand, when overcurrent detection is not required, that is, when the overcurrent detection conditions are not met, the amplification of the current value at the overcurrent protection point is stopped, so that the first load module receives the working voltage output by the voltage output module to work, avoiding the problem that the first load module overheats or cannot carry heavy loads due to continuously amplifying the current value at the overcurrent protection point, and the working stability of the overcurrent protection circuit is relatively high.
[0035] In one embodiment, such as Figure 3As shown in the figure, it is a schematic structural diagram of an overcurrent protection circuit provided by an embodiment of the present application. The overcurrent protection circuit includes: a control module 201, a first voltage adjustment module 202, a first voltage division module 203, a first switch module 204, a second voltage division module 205, a voltage output module 206, and a first load module 207. Among them, for the connection manner and functions between the above modules, please refer to the above Figure 1 , which will not be elaborated here.
[0036] In this embodiment, the first voltage adjustment module 202 includes: a first capacitor C1. The first end of the first capacitor C1 is connected to the first output end of the control module 201, and the second end of the first capacitor C1 is respectively connected to the input end of the first voltage division module 203 and the first input end of the first switch module 204.
[0037] The first voltage division module 204 includes: a first resistor R1. The first end of the first resistor R1 is connected to the output end of the first voltage adjustment module 202, and the second end of the first resistor R1 is connected to the second input end of the first switch module 204.
[0038] The second voltage division module 205 includes: a second resistor R2. The first end of the second resistor R2 is connected to the output end of the first switch module 204, and the second end of the second resistor R2 is connected to the input end of the first load module 207.
[0039] In this embodiment, the first switch module 204 includes: a first MOS transistor Q1. The gate of the first MOS transistor Q1 is connected to the output end of the first voltage adjustment module 202, the drain of the first MOS transistor Q1 is connected to the input end of the second voltage division module 205, and the source of the first MOS transistor Q1 is connected to the output end of the first voltage division module 203.
[0040] Based on the overcurrent protection circuit provided by this embodiment, when the control module 101 detects that the first overcurrent detection condition is met, it sends a control voltage to the first capacitor C1 to charge the first capacitor C1. During the charging process of the first capacitor C1, the voltage value of the first resistor R1 gradually rises to exceed the conduction voltage value of the first MOS transistor Q1. The first MOS transistor Q1 switches from the off state to the on state, and the second resistor R2 is connected in parallel with the first load module 207 to amplify the current value at the input end of the first load module 207. The control module 101 detects whether the current value at the input end of the first load module 207 exceeds the first current threshold to perform overcurrent protection on the first load module 207.
[0041] When the charging of the first capacitor C1 ends, the first capacitor C1 switches to the off state, the first MOS transistor Q1 switches from the on state to the off state, and the second resistor R2 is no longer connected in parallel with the first load module 207 to end the amplification of the current value at the input end of the first load module 207.
[0042] The overcurrent protection circuit provided by this application includes a control module, a first voltage adjustment module, a first voltage division module, a first switch module, a second voltage division module, a voltage output module, and a first load module. The overcurrent protection point of this overcurrent protection circuit is the input end of the first load module. When the control module detects a first overcurrent detection condition, it energizes the first voltage adjustment module to increase the voltage value corresponding to the first voltage division module until it exceeds the first voltage threshold, and the first switch module switches from the off state to the on state. Based on the first switch module that is switched to the on state, the second voltage division module is connected in parallel with the first load module to amplify the current value at the input end of the first load module. The control module detects whether the amplified current value corresponding to the overcurrent protection point exceeds the first current threshold, thereby performing overcurrent protection on the first load module. In this application, on the one hand, when detecting an overcurrent detection condition such as circuit startup, the current value at the overcurrent protection point is amplified, which can improve the sensitivity of overcurrent detection, speed up the response speed of overcurrent protection, and improve the overcurrent protection accuracy; on the other hand, when overcurrent detection is not required, that is, when the overcurrent detection condition is not met, the amplification of the current value at the overcurrent protection point is stopped, so that the first load module receives the working voltage output by the voltage output module to work, avoiding the problem that the first load module overheats or cannot carry heavy loads due to continuous amplification of the current value at the overcurrent protection point, and the working stability of the overcurrent protection circuit is relatively high.
[0043] In one embodiment, as Figure 4 shown, it is a schematic structural diagram of an overcurrent protection circuit provided by an embodiment of this application. This overcurrent protection circuit includes: a control module 301, a first voltage adjustment module 302, a first voltage division module 303, a first switch module 304, a second voltage division module 305, a voltage output module 306, and a first load module 307. This overcurrent protection circuit further includes: a second voltage adjustment module 308, a second switch module 309, a third voltage division module 310, a fourth voltage division module 311, and a second load module 312. For the connection structure and working principle of the control module 301, the first voltage adjustment module 302, the first voltage division module 303, the first switch module 304, the second voltage division module 305, the voltage output module 306, and the first load module 307, refer to Figure 1 shown, which will not be elaborated here.
[0044] In this embodiment, the input end of the second load module 312 is electrically connected to the first output end of the voltage output module 306, and the second load module 312 receives the working voltage to work.
[0045] The second output terminal of the control module 301 is electrically connected to the input terminal of the second voltage adjustment module 308. When the control module 301 detects that the second overcurrent detection condition is satisfied, it energizes the second voltage adjustment module 305. The second overcurrent detection condition can be any set condition. For example, when it is detected that the second load module 312 is connected to the overcurrent protection circuit, the control module 301 determines that the second overcurrent detection condition is satisfied and energizes the second voltage adjustment module 308 to start detecting the current value at the input terminal of the second load module 312.
[0046] The output terminal of the second voltage adjustment module 308 is electrically connected to the first input terminal of the second switch module 309 and the input terminal of the third voltage division module 310 respectively. The output terminal of the third voltage division module 309 is electrically connected to the second input terminal of the second switch module 310. During the energization process of the second voltage adjustment module 308, when the voltage value corresponding to the third voltage division module 309 gradually increases until it exceeds the second voltage threshold, the second switch module 310 switches from the off state to the on state.
[0047] The output terminal of the second switch module 310 is electrically connected to the input terminal of the fourth voltage division module 311. The input terminal of the second load module 312 is also electrically connected to the output terminal of the fourth voltage division module 311. The fourth voltage division module 311 is connected in parallel with the second load module based on the second switch module in the on state to amplify the current value at the input terminal of the second load module 312.
[0048] The detection terminal of the control module 301 is electrically connected to the input terminal of the second load module 312. The control module 301 detects whether the current value at the input terminal of the second load module 312 exceeds the second current threshold, and performs overcurrent protection on the second load module 312 when it is detected that the current value at the input terminal of the second load module 312 exceeds the second current threshold.
[0049] In this embodiment, the overcurrent protection circuit is provided with an overcurrent protection point corresponding to the input end of the first load module 307, and an overcurrent protection point corresponding to the input end of the second load module 312. For different overcurrent protection points, the specific contents corresponding to the first overcurrent detection condition and the second overcurrent detection condition are different. For example, the first overcurrent detection condition is that the first load module 307 starts. When it is detected that the first load module 307 starts and enters the working state, the control module 301 determines that the first overcurrent detection condition is satisfied, amplifies the current value at the input end of the first load module 307 serving as the overcurrent protection point, and performs acquisition and detection. The second overcurrent detection condition is that the second load module 312 starts. When it is detected that the second load module 312 starts and enters the working state, the control module 301 determines that the second overcurrent detection condition is satisfied, amplifies the current value at the input end of the second load module 312 serving as the overcurrent protection point, and performs acquisition and detection. For another example, the first overcurrent detection condition is that the voltage output module 306 starts to output the working voltage, and the second overcurrent detection condition is that an overcurrent detection instruction for performing overcurrent detection on the input end of the second load module 312 is received.
[0050] In this embodiment, multiple overcurrent protection points can be set in the overcurrent protection circuit, and for the overcurrent detection conditions for triggering each overcurrent protection point and amplifying the current value of the overcurrent protection point, different specific contents can be set, thereby improving the practicability of the overcurrent protection circuit and the accuracy of overcurrent protection.
[0051] In this embodiment, the resistance values corresponding to the second voltage division module and the fourth voltage division module can also be set, and different amplification degrees for the current value are set for different overcurrent protection points to meet complex usage requirements.
[0052] In another embodiment, when the first voltage adjustment module 303 finishes charging, it switches to the off state, so that the voltage value of the first voltage division module 303 is lower than the first voltage threshold, causing the first switch module 304 to switch from the on state to the off state. When the second voltage adjustment module 310 finishes charging, it switches to the off state, so that the voltage value of the third voltage division module 309 is lower than the second voltage threshold, causing the second switch module 310 to switch from the on state to the off state. Among them, the electric energy required for the first voltage adjustment module 302 to finish charging is different from the electric energy required for the second voltage adjustment module 308 to finish charging.
[0053] Specifically, when the charging of the first voltage adjustment module 303 ends, the first voltage adjustment module 303 switches to the off state, and the first switch module 304 switches from the on state to the off state. The second voltage division module 305 is no longer in parallel with the first load module 307 to end the amplification of the current value at the input end of the first load module 307.
[0054] When the charging of the second voltage adjustment module 308 ends, the second voltage adjustment module 308 switches to the off state, the second switch module 310 switches from the on state to the off state, and the second voltage dividing module 305 is no longer in parallel with the second load module 312, so as to end the amplification of the current value at the input end of the second load module 312.
[0055] Therefore, different amounts of electrical energy required for charging are set for the first voltage adjustment module 302 and the second voltage adjustment module 308 respectively. In other words, different times required for the charging of the first voltage adjustment module 302 and the second voltage adjustment module 308 to end are set respectively, so as to control the time for amplifying the current values at different overcurrent protection points. The duration for which the first voltage adjustment module 302 exceeds the first voltage threshold is different from the duration for which the second voltage adjustment module 308 exceeds the second voltage threshold, so that the duration for which the second voltage dividing module 305 is in parallel with the first load module is different from the duration for which the fourth voltage dividing module 311 is in parallel with the second load module.
[0056] For example, the time required for charging the first voltage adjustment module 302 is longer than the time required for charging the second voltage adjustment module 308, and the time for amplifying the current value at the input end of the first load module 307 is longer than the time for amplifying the current value at the input end of the second load module 312.
[0057] The overcurrent circuit provided in this embodiment sets different amplification times for different overcurrent protection points to meet complex usage requirements.
[0058] The overcurrent protection circuit provided by the present application includes a control module, a first voltage adjustment module, a first voltage division module, a first switch module, a second voltage division module, a voltage output module, and a first load module. The overcurrent protection point of the overcurrent protection circuit is the input end of the first load module. When the control module detects a first overcurrent detection condition and energizes the first voltage adjustment module to increase the voltage value corresponding to the first voltage division module until it exceeds the first voltage threshold, the first switch module switches from the off state to the on state. Based on the first switch module that switches to the on state, the second voltage division module is connected in parallel with the first load module to amplify the current value at the input end of the first load module. The control module detects whether the amplified current value corresponding to the overcurrent protection point exceeds the first current threshold, thereby performing overcurrent protection on the first load module. In the present application, on the one hand, when detecting an overcurrent detection condition such as circuit startup, the current value at the overcurrent protection point is amplified, which can improve the sensitivity of overcurrent detection, accelerate the response speed of overcurrent protection, and improve the overcurrent protection accuracy; on the other hand, when overcurrent detection is not required, that is, when the overcurrent detection condition is not met, the amplification of the current value at the overcurrent protection point is stopped, so that the first load module receives the working voltage output by the voltage output module to work, avoiding the problem that the first load module overheats or cannot carry a heavy load due to continuous amplification of the current value at the overcurrent protection point, and the working stability of the overcurrent protection circuit is relatively high.
[0059] In one embodiment, as Figure 5 shown, it is a schematic structural diagram of an overcurrent protection circuit provided by an embodiment of the present application. The overcurrent protection circuit includes: a control module 401, a first voltage adjustment module 402, a first voltage division module 403, a first switch module 404, a second voltage division module 405, a voltage output module 406, and a first load module 407. The overcurrent protection circuit further includes: a second voltage adjustment module 408, a second switch module 409, a third voltage division module 310, a fourth voltage division module 311, and a second load module 312.
[0060] The first voltage adjustment module 402 includes: a first capacitor C1. The first end of the first capacitor C1 is connected to the first output end of the control module 401, and the second end of the first capacitor C1 is respectively connected to the input end of the first voltage division module 403 and the first input end of the first switch module 404.
[0061] The first voltage division module 404 includes: a first resistor R1. The first end of the first resistor R1 is connected to the output end of the first voltage adjustment module 402, and the second end of the first resistor R1 is connected to the second input end of the first switch module 404.
[0062] The second voltage division module 405 includes: a second resistor R2. The first end of the second resistor R2 is connected to the output end of the first switch module 404, and the second end of the second resistor R2 is connected to the input end of the first load module 407.
[0063] The second voltage adjustment module 308 includes: a second capacitor C2. The first end of the second capacitor C2 is connected to the second output end of the control module 401, and the second end of the second capacitor C2 is respectively connected to the input end of the third voltage division module 409 and the first input end of the second switch module 410.
[0064] The third voltage division module 309 includes: a third resistor R3. The first end of the third resistor R3 is connected to the output end of the second voltage adjustment module 408, and the second end of the third resistor R3 is connected to the second input end of the second switch module 410.
[0065] The second switch module 310 includes: a second MOS transistor Q2. The gate of the second MOS transistor Q2 is connected to the output end of the second voltage adjustment module 408, the source of the second MOS transistor Q2 is connected to the output end of the third voltage division module 409, and the drain of the second MOS transistor Q2 is connected to the input end of the fourth voltage division module 411.
[0066] The fourth voltage division module 311 includes: a fourth resistor R4. The first end of the fourth resistor R4 is connected to the output end of the second switch module 410, and the second end of the fourth resistor R4 is connected to the input end of the second load module 412.
[0067] The overcurrent protection circuit provided by this application includes a control module, a first voltage adjustment module, a first voltage division module, a first switch module, a second voltage division module, a voltage output module, and a first load module. The overcurrent protection point of the overcurrent protection circuit is the input end of the first load module. When the control module detects the first overcurrent detection condition and energizes the first voltage adjustment module to increase the voltage value corresponding to the first voltage division module until it exceeds the first voltage threshold, the first switch module switches from the off state to the on state. Based on the first switch module switched to the on state, the second voltage division module is connected in parallel with the first load module to amplify the current value at the input end of the first load module. The control module detects whether the amplified current value corresponding to the overcurrent protection point exceeds the first current threshold, thereby performing overcurrent protection on the first load module. In this application, on the one hand, when detecting overcurrent detection conditions such as circuit startup, the current value at the overcurrent protection point is amplified, which can improve the sensitivity of overcurrent detection, accelerate the response speed of overcurrent protection, and improve the overcurrent protection accuracy; on the other hand, when overcurrent detection is not required, that is, when the overcurrent detection condition is not met, the amplification of the current value at the overcurrent protection point is stopped, so that the first load module receives the working voltage output by the voltage output module to work, avoiding the problem that the first load module overheats or cannot carry heavy loads due to continuously amplifying the current value at the overcurrent protection point, and the working stability of the overcurrent protection circuit is relatively high.
[0068] The embodiment of this application also provides a circuit board, which includes as Figures 1 to 5Any overcurrent protection circuit.
[0069] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only memory, or a random access memory, etc.
[0070] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.
[0071] The above-disclosed are only the preferred embodiments of the present application. Of course, the scope of the rights of the present application cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.
Claims
1. An overcurrent protection circuit, characterized in that: The overcurrent protection circuit comprises: A control module, a first voltage adjustment module, a first voltage dividing module, a first switch module, a second voltage dividing module, a voltage output module and a first load module; The first output end of the control module is electrically connected to the input end of the first voltage adjustment module, the output end of the first voltage adjustment module is electrically connected to the first input end of the first switch module and the input end of the first voltage divider module, the output end of the first voltage divider module is electrically connected to the second input end of the first switch module, the output end of the first switch module is electrically connected to the input end of the second voltage divider module, the output end of the second voltage divider module is electrically connected to the input end of the first load module, and the input end of the first load module is electrically connected to the detection end of the control module and the first output end of the voltage output module respectively; When the control module detects a first overcurrent detection condition, the control module adjusts the voltage value of the first voltage divider module to exceed a first voltage threshold through the first voltage adjustment module, so that the first switch module and the second voltage divider module are both switched to a working state. At this time, the second voltage divider module is connected in parallel with the first load module. When the control module detects that the current value at the input end of the first load module exceeds the first current threshold, the first load module is protected from overcurrent.
2. The overcurrent protection circuit according to claim 1, characterized in that: The first switch module includes: a first MOS tube; The gate of the first MOS tube is connected to the output end of the first voltage adjustment module, the drain of the first MOS tube is connected to the input end of the second voltage divider module, and the source of the first MOS tube is connected to the output end of the first voltage divider module.
3. The overcurrent protection circuit according to claim 1, characterized in that: The first voltage adjustment module includes: a first capacitor; The first end of the first capacitor is connected to the first output end of the control module, and the second end of the first capacitor is connected to the input end of the first voltage divider module and the first input end of the first switch module respectively.
4. The overcurrent protection circuit according to claim 1, characterized in that: The first voltage dividing module includes: a first resistor; The first end of the first resistor is connected to the output end of the first voltage adjustment module, and the second end of the first resistor is connected to the second input end of the first switch module.
5. The overcurrent protection circuit according to claim 1, characterized in that: The second voltage dividing module includes: a second resistor; A first end of the second resistor is connected to an output end of the first switch module, and a second end of the second resistor is connected to an input end of the first load module.
6. The overcurrent protection circuit according to claim 1, characterized in that: The overcurrent protection circuit further includes: a second voltage adjustment module, a second switch module, a third voltage dividing module, a fourth voltage dividing module and a second load module; The input end of the second load module is electrically connected to the first output end of the voltage output module, the second output end of the control module is electrically connected to the input end of the second voltage adjustment module, the output end of the second voltage adjustment module is electrically connected to the first input end of the second switch module and the input end of the third voltage divider module respectively, the output end of the third voltage divider module is electrically connected to the second input end of the second switch module, the output end of the second switch module is electrically connected to the input end of the fourth voltage divider module, and the input end of the second load module is also electrically connected to the output end of the fourth voltage divider module; When the control module detects the second overcurrent detection condition, the control module adjusts the voltage value of the second voltage divider module to exceed the second voltage threshold through the second voltage adjustment module, so that the first switch module and the second voltage divider module are both switched to the working state. At this time, the second voltage divider module is connected in parallel with the second load module. When the control module detects that the current value at the input end of the second load module exceeds the second current threshold, the second load module is protected from overcurrent.
7. The overcurrent protection circuit according to claim 6, characterized in that: The first over-current detection condition and the second over-current detection condition respectively correspond to different specific contents.
8. The overcurrent protection circuit according to claim 7, characterized in that: The second voltage adjustment module includes: a second capacitor; The first end of the second capacitor is connected to the second output end of the control module, and the second end of the second capacitor is respectively connected to the input end of the third voltage divider module and the first input end of the second switch module.
9. The overcurrent protection circuit according to claim 6, characterized in that: The second switch module includes: a second MOS tube; The gate of the second MOS tube is connected to the output end of the second voltage adjustment module, the source of the second MOS tube is connected to the output end of the third voltage divider module, and the drain of the second MOS tube is connected to the input end of the fourth voltage divider module.
10. A circuit board, characterized in that: Comprising the overcurrent protection circuit as described in any one of claims 1-9.