Circuit board structure, LED display unit and LED display screen
By setting a temperature detection circuit and an anomaly handling module on the circuit board, and using a self-resetting fuse to detect local temperature anomalies and control the power shutdown, the problem of combustion caused by local short circuits or overheating of the circuit board is solved, thus improving the safety and reliability of the circuit board.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-24
- Publication Date
- 2026-03-31
AI Technical Summary
In the event of a partial short circuit or overheating, the fuses on existing circuit boards may fail to function in time, leading to safety hazards such as circuit board combustion or even equipment burnout.
A temperature detection circuit, including a series-connected resettable fuse, is installed on the circuit board to detect local temperature anomalies and control the power supply to shut down through a temperature anomaly handling module to prevent the circuit board temperature from continuing to rise.
By combining a self-resetting fuse and a temperature anomaly handling module, the power can be shut off in time to prevent the circuit board from burning, thus improving the safety and reliability of the circuit board.
Smart Images
Figure CN224068852U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of display, and particularly relates to a circuit board structure, an LED display unit and an LED display screen. BACKGROUND
[0002] The circuit board often catches fire due to heat generated by the circuit for various reasons when the circuit has a large power, which brings great security risks to the equipment and personal and property safety.
[0003] To solve the above problems, the most common method is to install a fuse at a certain circuit. However, for many circuits, such as the module of the LED display screen, the normal working current is already large, and a small short-circuit current in a local area of the module can cause local high temperature and thus ignite the nearby equipment, resulting in carbonization of the circuit board and further causing a larger current in the local area, which causes more severe burning. When the fuse starts to work, the equipment has been severely burned. CONTENT OF THE UTILITY MODEL
[0004] Embodiments of the application provide a circuit board structure, which aims to solve the problem that the existing circuit board cannot timely play a role when a fuse is installed at a certain place, resulting in burning of the circuit board and even burning of the equipment.
[0005] Embodiments of the application are implemented in the following manner, a circuit board structure is provided, which comprises:
[0006] a circuit board body;
[0007] a temperature detection circuit arranged on the circuit board body, the temperature detection circuit comprising a plurality of self-resetting fuses connected in series, any self-resetting fuse outputting a first signal when the temperature in the region where the self-resetting fuse is located is abnormal; and
[0008] a temperature abnormality processing module electrically connected to the temperature detection circuit, the temperature abnormality processing module being configured to output a first control signal when the first signal is received, the first control signal being configured to control the power supply of the circuit board body to be turned off.
[0009] Further, the self-resetting fuses are distributed in the heat-prone region of the circuit board body.
[0010] Further, the circuit board structure further comprises a delay module electrically connected to the temperature abnormality processing module, the delay module being configured to prolong the time for the temperature abnormality processing module to control the power supply to be turned off.
[0011] Further, the temperature abnormality processing module comprises a first resistor, a second resistor, a third resistor, a first switch tube and a second switch tube.
[0012] The first end of the first resistor is connected with the positive pole of the power supply, the second end of the first resistor is grounded through a plurality of self-resetting fuses connected in series, and the second end of the first resistor is also connected with the first end of the second resistor.
[0013] The second end of the second resistor is connected with the control end of the first switch tube through the third resistor, the first end of the first switch tube is grounded, the second end of the first switch tube is connected with the control end of the second switch tube, and the second switch tube is arranged on a line between the power supply and the circuit board body.
[0014] The first switch tube includes any one of a triode, a MOS tube and a relay, and the second switch tube includes any one of a triode, a MOS tube and a relay.
[0015] Further, the circuit board body has a load, one end of the load is connected with the positive pole of the power supply, and the other end of the load is connected with the negative pole of the power supply or grounded.
[0016] The second switch tube is arranged on a line between the positive pole of the power supply and the load, or on a line between the load and the negative pole of the power supply, or on a line where the load is grounded.
[0017] Further, the delay module includes a fourth resistor, a fifth resistor, a sixth resistor and a third switch tube.
[0018] The first end of the fourth resistor is connected with the positive pole of the power supply, the second end of the fourth resistor is connected with the control end of the third switch tube through the fifth resistor, and the second end of the fourth resistor is also connected with the second end of the first switch tube.
[0019] The first end of the third switch tube is connected with the positive pole of the power supply, and the second end of the third switch tube is connected with the second end of the second resistor through the sixth resistor.
[0020] Further, the third switch tube includes any one of a triode, a MOS tube and a relay.
[0021] In a second aspect, the application provides an LED display unit, which includes the circuit board structure as described above.
[0022] In a third aspect, the application provides an LED display screen, which includes the LED display unit as described above.
[0023] The beneficial effects of the present application: the circuit board structure provided by the present application comprises a circuit board body; a temperature detection circuit arranged on the circuit board body, the temperature detection circuit comprising a plurality of self-resetting fuses connected in series, any self-resetting fuse outputting a first signal when the temperature of the region where the self-resetting fuse is located is abnormal; and a temperature abnormality processing module electrically connected with the temperature detection circuit, the temperature abnormality processing module being configured to output a first control signal when the first signal is received, the first control signal being used to control the power supply of the circuit board body to be turned off. The plurality of self-resetting fuses are arranged on the circuit board body, and the self-resetting fuses are connected in series to form the temperature detection circuit, so that the temperature detection circuit outputs the first signal to the temperature abnormality processing module to turn off the power supply when any self-resetting fuse is abnormal in the region where the self-resetting fuse is located, so that the circuit board cannot reach the temperature of fire, thereby avoiding the occurrence of combustion. BRIEF DESCRIPTION OF DRAWINGS
[0024] Fig. 1 is a pipeline structure schematic diagram of one embodiment of the circuit board structure provided by the present application;
[0025] Fig. 2 is a structure schematic diagram of the pipeline provided with a leakage detection device of one embodiment of the circuit board structure provided by the present application.
[0026] BRIEF DESCRIPTION OF DRAWINGS: 100-circuit board body, 200-temperature detection circuit, 210-self-resetting fuse, 300-temperature abnormality processing module, 400-power supply, 500-delay module, RL-load, R1-first resistor, R4-second resistor, R6-third resistor, Q2-first switch tube, Q3-second switch tube, R2-fourth resistor, R3-fifth resistor, R5-sixth resistor, Q1-third switch tube. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application. In addition, it should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.
[0028] In the description of the application, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", and the like are intended to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the application.
[0029] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.
[0030] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.
[0031] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or the indirect contact of the first and second features through another feature between them. Moreover, the "upper", "above" and "above" of the first feature to the second feature include the vertical direction of the first feature above and oblique above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical direction of the first feature below and oblique below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0032] The disclosure below provides many different embodiments or examples for implementing different structures of the application. For the sake of brevity and clarity, descriptions of all possible combinations are not provided in the following description of various examples. Of course, it is noted that all combinations are possible and within the scope of the application. In addition, the application can refer to a number and / or letter of a reference in different examples. Such repetition is for the sake of a simpler and clearer discussion, and does not indicate a relationship between the various embodiments and / or arrangements discussed. In addition, the application provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the application of other processes and / or the use of other materials.
[0033] The circuit board structure provided by the application comprises a circuit board body; a temperature detection circuit arranged on the circuit board body, the temperature detection circuit comprising a plurality of self-resetting fuses connected in series, the temperature detection circuit outputting a first signal when any self-resetting fuse is abnormal in temperature in the region where it is located; and a temperature abnormality processing module electrically connected with the temperature detection circuit, the temperature abnormality processing module being configured to output a first control signal when the first signal is received, the first control signal being configured to control the power supply of the circuit board body to be turned off. The self-resetting fuses are arranged on the circuit board body, and the self-resetting fuses are connected in series to form the temperature detection circuit, so that the temperature detection circuit outputs the first signal to the temperature abnormality processing module to turn off the power supply when any self-resetting fuse is abnormal in temperature in the region where it is located, so that the circuit board cannot reach the temperature of fire, thereby avoiding the occurrence of combustion.
[0034] As shown in Figs. 1-2 One embodiment of the application provides a circuit board structure, comprising:
[0035] a circuit board body 100;
[0036] a temperature detection circuit 200 arranged on the circuit board body 100, the temperature detection circuit 200 comprising a plurality of self-resetting fuses 210 connected in series, the temperature detection circuit 200 outputting a first signal when any self-resetting fuse 210 is abnormal in temperature in the region where it is located; and
[0037] a temperature abnormality processing module 300 electrically connected with the temperature detection circuit 200, the temperature abnormality processing module 300 being configured to output a first control signal when the first signal is received, the first control signal being configured to control the power supply 400 of the circuit board body 100 to be turned off.
[0038] In implementation, the circuit board body 100 is a carrier for carrying electronic components, for example, the circuit board body 100 can be a PCB (Printed Circuit Board), without limitation.
[0039] In some embodiments, the circuit board body 100 is provided with lines connecting the power supply 400, the load RL and other components such as LEDs (light emitting diodes), resistors, capacitors or inductors, etc., and the power supply 400 supplies power to the load RL and other components to make the load RL and other components work normally and cooperatively to realize specific functions such as signal acquisition, signal amplification, signal reception and storage, etc., without limitation.
[0040] The circuit board body 100 provided in the application is provided with a temperature detection circuit 200 composed of a plurality of self-resetting fuses 210 in series. The self-resetting fuse 210 can be a PTC (Positive Temperature Coefficient Thermistor) fuse, which is an electronic protection component with a positive temperature coefficient effect and can protect the circuit by increasing the resistance value when the current is too large.
[0041] The self-resetting fuse 210 is arranged on the circuit board body 100 to detect the temperature at its location. When the temperature at the area where any self-resetting fuse 210 is located is abnormal, the temperature detection circuit 200 outputs a first signal. Generally, the resistance value of the self-resetting fuse 210 increases with the increase of temperature, so that the signal output by the temperature detection circuit 200 also changes. In the application, the signal output by the temperature detection circuit 200 when the temperature of the self-resetting fuse 210 reaches a certain threshold value is regarded as the first signal.
[0042] Optionally, the self-resetting fuses 210 are distributed in the easy-to-heat areas of the circuit board body 100. The easy-to-heat area refers to the area of the circuit board body 100 provided with power devices such as LEDs or IGBTs (Insulated Gate Bipolar Transistors), etc. These power devices generate a large amount of heat when working, which can easily cause the temperature of the local area to rise and even cause the circuit board to burn. The application can detect the temperature of the circuit board more accurately and safely by distributing the self-resetting fuses 210 in the easy-to-heat areas.
[0043] The temperature abnormality processing module 300 is electrically connected with the temperature detection circuit 200. When the temperature abnormality processing module 300 receives the first signal output by the temperature detection circuit 200, i.e. when the temperature of the area where one or more self-resetting fuses 210 is located is abnormally high, the temperature abnormality processing module 300 will output a first control signal to control the power supply 400 of the circuit board body 100 to be turned off through the first control signal.
[0044] It should be noted that the above certain threshold value can be set according to actual use scene and use requirement. Exemplarily, taking the abnormal temperature exceeding 200 DEG C as an example, the temperature of the circuit board when the circuit normally works can reach 50 DEG C to 80 DEG C, for example, 52 DEG C, 55 DEG C, 58 DEG C, 60 DEG C, 65 DEG C, 70 DEG C, 75 DEG C or any value in 50 DEG C to 80 DEG C, at this time, the self-resetting fuse 210 is in a low resistance state. When the temperature of a certain area where the self-resetting fuse 210 is located is abnormally high and reaches 200 DEG C or more, for example, the temperature reaches 210 DEG C, 220 DEG C, 230 DEG C, 250 DEG C, 280 DEG C or 300 DEG C, etc., the temperature of the self-resetting fuse 210 in the area also rises, and when the temperature exceeds the Curie temperature of the self-resetting fuse 210, the resistance of the self-resetting fuse 210 will increase sharply, blocking the current of the temperature detection circuit 200. At this time, the temperature detection circuit 200 can be regarded as outputting a first signal, and then the temperature abnormality processing module 300 executes the set program according to the first signal to shut down the power supply 400, avoiding the situation that the temperature of the local area continues to rise and causes the circuit board to burn.
[0045] The circuit board structure provided in the application comprises a circuit board body 100; a temperature detection circuit 200 arranged on the circuit board body 100, the temperature detection circuit 200 comprising a plurality of self-resetting fuses 210 connected in series, the temperature detection circuit 200 outputting a first signal when the temperature of any self-resetting fuse 210 in the area is abnormal; and a temperature abnormality processing module 300 electrically connected with the temperature detection circuit 200, the temperature abnormality processing module 300 being configured to output a first control signal when the first signal is received, the first control signal being configured to control the power supply 400 of the circuit board body 100 to be shut down. In the application, a plurality of self-resetting fuses 210 are arranged on the circuit board body 100, and the self-resetting fuses 210 are connected in series to form the temperature detection circuit 200, so that the temperature detection circuit 200 outputs the first signal to the temperature abnormality processing module 300 to shut down the power supply 400 when the temperature of any self-resetting fuse 210 in the area is abnormal, so that the circuit board cannot reach the temperature of fire, thereby avoiding the occurrence of burning.
[0046] In some embodiments, the circuit board structure provided in the application further comprises a delay module 500 electrically connected with the temperature abnormality processing module 300, the delay module 500 being configured to prolong the time for the temperature abnormality processing module 300 to control the power supply 400 to be shut down.
[0047] In implementation, the temperature abnormality processing module 300 comprises a first resistor R1, a second resistor R4, a third resistor R6, a first switch tube Q2 and a second switch tube Q3.
[0048] The first end of the first resistor R1 is connected with the positive pole of the power supply 400, the second end of the first resistor R1 is grounded through a plurality of self-resetting fuses 210 connected in series, and the second end of the first resistor R1 is also connected with the first end of the second resistor R4.
[0049] The second end of the second resistor R4 is connected with the control end of the first switch tube Q2 through the third resistor R6, the first end of the first switch tube Q2 is grounded, the second end of the first switch tube Q2 is connected with the control end of the second switch tube Q3, and the second switch tube Q3 is arranged on the line of the power supply 400 and the circuit board body 100.
[0050] In implementation, the first switch tube Q2 can be a triode, a MOS tube, a relay or other components with switching function, without limitation.
[0051] The pins of the switch tube correspond to the pins of the corresponding type of switch device one by one, for example, taking a triode as an example, the control end, the first end and the second end of the switch tube are the base, the emitter and the collector of the triode respectively; similarly, when the switch tube is a MOS tube, the control end, the first end and the second end of the switch tube are the gate, the source and the drain of the MOS tube respectively, without further description.
[0052] Optionally, the resistance values of the first resistor R1, the second resistor R4 and the third resistor R6 can be set according to actual use requirements, for example, the resistance value of the first resistor R1 ranges from 100 ohms to 500 ohms, the resistance value of the second resistor R4 ranges from 1000 ohms to 4000 ohms, and the resistance value of the third resistor R6 ranges from 50K ohms to 200K ohms. For example, the resistance value of the first resistor R1 ranges from any one of 110 ohms, 120 ohms, 150 ohms, 200 ohms, 300 ohms, 400 ohms or 100 ohms to 500 ohms; for example, the resistance value of the second resistor R4 ranges from any one of 1100 ohms, 1200 ohms, 1500 ohms, 2000 ohms, 3000 ohms, 3500 ohms or 1000 ohms to 4000 ohms; for example, the resistance value of the third resistor R6 ranges from any one of 60K ohms, 70K ohms, 80K ohms, 90K ohms, 100K ohms, 150K ohms or 50K ohms to 200K ohms, without limitation.
[0053] The self-resetting fuses 210 are taken as an example with 12 self-resetting fuses, which are PTC1, PTC2, PTC3, PTC4, PTC5, PTC6, PTC7, PTC8, PTC9, PTC10, PTC11 and PTC11 respectively, as shown in Fig. 2The 12 self-resetting fuses 210 are connected in series, one end of the series connection is connected to the ground, and the other end is connected to the positive pole of the power supply 400 through the first resistor R1, and the first resistor R1 is a current limiting resistor. Under normal circumstances, the temperature on the circuit board is below 80 degrees Celsius, and the self-resetting fuse 210 is in a low resistance state, at this time, a larger current passes through the series connected self-resetting fuses 210.
[0054] It should be noted that the above-mentioned self-resetting fuse 210 is provided with 12, which is an example of the embodiment of the application, not a specific limitation of the application, and in other embodiments, the number and position of the self-resetting fuse 210 can be specifically set according to actual use requirements, which will not be repeated here.
[0055] Further, the circuit board body 100 has a load RL, one end of the load RL is connected to the positive pole of the power supply 400, and the other end of the load RL is connected to the negative pole of the power supply 400 or grounded.
[0056] The second switch tube Q3 is arranged on the line between the positive pole of the power supply 400 and the load RL, or on the line between the load RL and the negative pole of the power supply 400, or on the line of the load RL grounded.
[0057] In implementation, the second switch tube Q3 can refer to the above-mentioned first switch tube Q2, which will not be repeated here.
[0058] The load RL can be an LED, a MOS tube, an IGBT or other power devices, which will not be repeated here.
[0059] Further, the delay module 500 includes a fourth resistor R2, a fifth resistor R3, a sixth resistor R5 and a third switch tube Q1.
[0060] The first end of the fourth resistor R2 is connected to the positive pole of the power supply 400, the second end of the fourth resistor R2 is connected to the control end of the third switch tube Q1 through the fifth resistor R3, and the second end of the fourth resistor R2 is also connected to the second end of the first switch tube Q2.
[0061] The first end of the third switch tube Q1 is connected to the positive pole of the power supply 400, and the second end of the third switch tube Q1 is connected to the second end of the second resistor R4 through the sixth resistor R5.
[0062] In implementation, the third switch tube Q1 can refer to the above-mentioned first switch tube Q2 and the second switch tube Q3, which will not be repeated here.
[0063] Optionally, the resistance values of the fourth resistor R2, the fifth resistor R3, and the sixth resistor R5 can be set according to actual usage requirements. For example, the resistance value of the fourth resistor R2 is in the range of 5K ohms to 20K ohms, the resistance value of the fifth resistor R3 is in the range of 50K ohms to 200K ohms, and the resistance value of the sixth resistor R5 is in the range of 5K ohms to 20K ohms. For example, the resistance value of the fourth resistor R2 can be any value from 5.5K ohms, 6K ohms, 8K ohms, 10K ohms, 12K ohms, 15K ohms, or 5K ohms to 20K ohms; the resistance value of the fifth resistor R3 can be any value from 60K ohms, 70K ohms, 80K ohms, 90K ohms, 100K ohms, 150K ohms, or 50K ohms to 200K ohms; the resistance value of the sixth resistor R5 can be any value from 5.5K ohms, 5.6K ohms, 5.7K ohms, 6K ohms, 7K ohms, 7.5K ohms, or 5K ohms to 20K ohms, without limitation.
[0064] Taking the resettable fuse 210 as an example (using a PTC), under normal circumstances, the temperature on the circuit board is below 80 degrees Celsius, and the PTC is in a low-resistance state, allowing a large current to flow through the series-connected PTC. If an abnormal heating occurs in the area where a PTC is located, exceeding 200 degrees Celsius, the temperature of nearby PTCs will also rise. When this temperature exceeds the Curie temperature of the PTC, its resistance will increase sharply, blocking the current in the PTC series circuit. At this point, the temperature anomaly handling module 300 will make a decision based on a set threshold and shut off the total current.
[0065] For example, with Fig. 2 Taking the circuit shown as an example, RL is the circuit load, the third switch Q1 and the first switch Q2 are transistors, the second switch Q3 is a MOSFET, and the power supply 400 is a +5V power input. The PTC sensors use 0603 self-resetting fuses, and 12 PTC sensors are arranged on the circuit board. At room temperature, the on-resistance of the PTC sensor is less than 1 ohm. When the temperature exceeds 100 degrees Celsius, the resistance of the PTC sensor reaches more than 100 ohms. These PTC sensors are powered through the first resistor R1. During normal operation, the voltage across the first resistor R1 is less than 0.3V, the first switch Q2 is off, and the second switch Q3 is on.
[0066] Once a PTC sensor detects a temperature exceeding a critical value, its resistance will increase sharply, causing the voltage across the first resistor R1 to exceed 0.7V. At this point, the first switch Q2 will turn on, the second switch Q3 will turn off, and the load RL will be de-energized.
[0067] The third switch Q1 starts to conduct at the same time when the second switch Q3 is off, which further ensures the continuous conduction of the first switch Q2. Even if the load RL is powered off, the resistance of the PTC slightly decreases due to slight cooling, but the first switch Q2 still keeps conducting under the help of the third switch Q1. Only when the PTC is close to completely cool down, the first switch Q2 will be off again. This is a hysteresis effect, which avoids the frequent oscillation between the conduction and the off of the first switch Q2 and the second switch Q3.
[0068] In some embodiments, the temperature abnormality processing module 300 can make a decision by collecting the voltage division value of the current limiting resistor and the PTC.
[0069] The switch (the second switch Q3) for turning off the total current can be placed at the positive pole of the power supply 400 or at the negative pole.
[0070] In order to avoid the situation that the PTC temperature decreases after the total current is turned off, and then the load RL is turned on again, so that the system repeatedly oscillates between the on and the off, a delay module 500 is added, that is, when the temperature of the PTC rises to a critical temperature T1, the temperature abnormality processing module 300 turns off the total current, and then waits for the PTC to cool down to another temperature value T2 which is much lower than T1, and then turns on the load RL circuit again. If the load RL circuit still generates a large amount of heat, it will be turned off again, and then cooled to the temperature value T2 again. In this way, the frequency of switching is greatly reduced, the heat generated by the fault circuit is reduced, and the circuit is also protected from overloading and damage.
[0071] In the second aspect, the present application provides an LED display unit comprising the circuit board structure as described above.
[0072] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the circuit structure and implementation principle of the LED display unit described above can refer to the corresponding structure and implementation principle in the foregoing embodiments, which will not be described here.
[0073] The circuit board structure provided by the application comprises a circuit board body 100, a temperature detection circuit 200 arranged on the circuit board body 100, the temperature detection circuit 200 comprising a plurality of self-resetting fuses 210 connected in series, the temperature detection circuit 200 outputting a first signal when the temperature of any self-resetting fuse 210 in the region is abnormal, and a temperature abnormality processing module 300 electrically connected with the temperature detection circuit 200, the temperature abnormality processing module 300 being configured to output a first control signal when the first signal is received, the first control signal being configured to control a power supply 400 of the circuit board body 100 to be turned off. The self-resetting fuses 210 are arranged on the circuit board body 100, the self-resetting fuses 210 are connected in series to form the temperature detection circuit 200, so that the temperature detection circuit 200 outputs the first signal to the temperature abnormality processing module 300 when the temperature of any self-resetting fuse 210 in the region is abnormal, to turn off the power supply 400, so that the circuit board cannot reach the temperature of fire, thereby avoiding the occurrence of combustion.
[0074] In a third aspect, the application provides an LED display screen, characterized in comprising a plurality of LED display units as described above.
[0075] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the circuit structure and implementation principle of the LED display screen described above can refer to the corresponding structure and implementation principle in the foregoing embodiments, which will not be described here.
[0076] The circuit board structure provided by the application comprises a circuit board body 100, a temperature detection circuit 200 arranged on the circuit board body 100, the temperature detection circuit 200 comprising a plurality of self-resetting fuses 210 connected in series, the temperature detection circuit 200 outputting a first signal when the temperature of any self-resetting fuse 210 in the region is abnormal, and a temperature abnormality processing module 300 electrically connected with the temperature detection circuit 200, the temperature abnormality processing module 300 being configured to output a first control signal when the first signal is received, the first control signal being configured to control a power supply 400 of the circuit board body 100 to be turned off. The self-resetting fuses 210 are arranged on the circuit board body 100, the self-resetting fuses 210 are connected in series to form the temperature detection circuit 200, so that the temperature detection circuit 200 outputs the first signal to the temperature abnormality processing module 300 when the temperature of any self-resetting fuse 210 in the region is abnormal, to turn off the power supply 400, so that the circuit board cannot reach the temperature of fire, thereby avoiding the occurrence of combustion.
[0077] The above is only a preferred embodiment of the application, and is not intended to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the application.
Claims
1. A circuit board structure, characterized by, The circuit board structure comprises: a circuit board body; a temperature detection circuit arranged on the circuit board body, the temperature detection circuit comprising a plurality of self-resetting fuses connected in series, and the temperature detection circuit outputting a first signal when any of the self-resetting fuses is abnormal in temperature in a region thereof; a temperature abnormality processing module electrically connected to the temperature detection circuit, the temperature abnormality processing module being configured to output a first control signal for controlling the power supply of the circuit board body to be turned off upon receiving the first signal. The self-resetting fuses are distributed in a region of the circuit board body that is prone to heat generation.
2. The circuit board structure of claim 1, wherein, The circuit board structure further comprises a delay module electrically connected to the temperature abnormality processing module, the delay module being configured to prolong the time for the temperature abnormality processing module to control the power supply to be turned off.
3. The circuit board structure of claim 1, wherein, The temperature abnormality processing module comprises a first resistor, a second resistor, a third resistor, a first switch tube and a second switch tube.
4. The circuit board structure of claim 3, wherein, A first end of the first resistor is connected to a positive pole of the power supply, a second end of the first resistor is grounded through a plurality of self-resetting fuses connected in series, and the second end of the first resistor is also connected to a first end of the second resistor. A second end of the second resistor is connected to a control end of the first switch tube through the third resistor, a first end of the first switch tube is grounded, a second end of the first switch tube is connected to a control end of the second switch tube, and the second switch tube is arranged on a line between the power supply and the circuit board body. The first switch tube comprises any one of a triode, a MOS tube and a relay, and the second switch tube comprises any one of a triode, a MOS tube and a relay.
5. The circuit board structure of claim 4, wherein, The circuit board body has a load, one end of the load is connected to the positive pole of the power supply, and the other end of the load is connected to a negative pole of the power supply or grounded.
6. The circuit board structure of claim 4, wherein, The second switch tube is arranged on a line between the positive pole of the power supply and the load, or on a line between the load and the negative pole of the power supply, or on a line where the load is grounded. The delay module comprises a fourth resistor, a fifth resistor, a sixth resistor and a third switch tube.
7. The circuit board structure according to any one of claims 4 to 6, wherein A first end of the fourth resistor is connected to the positive pole of the power supply, a second end of the fourth resistor is connected to a control end of the third switch tube through the fifth resistor, and the second end of the fourth resistor is also connected to the second end of the first switch tube. A first end of the third switch tube is connected to the positive pole of the power supply, and a second end of the third switch tube is connected to the second end of the second resistor through the sixth resistor. The third switch tube comprises any one of a triode, a MOS tube and a relay.
8. The circuit board structure of claim 7, wherein, The circuit board structure comprises any one of claims 1 to 8.
9. An LED display unit, characterized by The LED display unit comprises a plurality of the LED display units of claim 9.
10. An LED display screen, characterized by