CN113393807A - Device for preventing LED display screen spontaneous combustion - Google Patents
Device for preventing LED display screen spontaneous combustion Download PDFInfo
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- CN113393807A CN113393807A CN202110810165.5A CN202110810165A CN113393807A CN 113393807 A CN113393807 A CN 113393807A CN 202110810165 A CN202110810165 A CN 202110810165A CN 113393807 A CN113393807 A CN 113393807A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 27
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 39
- 238000005070 sampling Methods 0.000 claims abstract description 28
- 230000005669 field effect Effects 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 36
- 238000012545 processing Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 9
- 239000003381 stabilizer Substances 0.000 claims description 6
- 230000001131 transforming effect Effects 0.000 claims description 4
- 101100156949 Arabidopsis thaliana XRN4 gene Proteins 0.000 claims description 3
- 101100215777 Schizosaccharomyces pombe (strain 972 / ATCC 24843) ain1 gene Proteins 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/04—Display protection
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Abstract
The invention provides a device for preventing an LED display screen from spontaneous combustion, and relates to the technical field of LED display screen protection devices. The device comprises a control module, a power supply module, a program downloading module, a current detection module and a field effect transistor Q8, wherein the power supply module, the program downloading module, the current detection module and the field effect transistor Q8 are respectively connected with the control module; the current detection module comprises a detection circuit and a sampling resistor R6, and the sampling resistor R6 is connected with the control module through the detection circuit. The LED display screen protection device can protect each LED display screen more accurately, so that the problem of short circuit spontaneous combustion is avoided.
Description
Technical Field
The invention relates to the technical field of LED display screen protection devices, in particular to a device for preventing an LED display screen from spontaneous combustion.
Background
An LED display screen (LED DISPLAY) is a flat panel display, consisting of small LED module panels, used to display various information such as text, images, video, etc. Each display screen panel can be seen as a plurality of modules connected in parallel from the perspective of energy supply, and the working characteristics of the display screen panel show that the display screen panel is low in voltage and large in current. Generally, a switching power supply is arranged in each LED display screen, and an overcurrent protection device or a protection device for preventing over-high temperature exists in each LED display screen, so that the dc output can be automatically turned off after the total output current exceeds the maximum rated current, and a protection effect is achieved. However, the working circuit of a single module exceeds the normal working range, and the switching power supply cannot start a protection mechanism, that is, the working voltage or current of the single module cannot be detected in real time in the circuit of the existing LED display screen, so that even if the LED display screen of the single module is opened, short-circuited or otherwise abnormal, the LED display screen cannot be detected and maintained in time, and therefore the display screen is blacked or uncontrolled (locally or totally normally bright) in a unit of the module, and even a serious person is short-circuited and generates heat to cause a fire disaster.
Disclosure of Invention
The invention aims to provide a device for preventing LED display screens from spontaneous combustion, which can more accurately protect each LED display screen, thereby avoiding the problem of short circuit spontaneous combustion.
The embodiment of the invention is realized by the following steps:
the embodiment of the application provides a device for preventing an LED display screen from spontaneous combustion, which comprises a control module, a power module, a program downloading module, a current detection module and a field effect transistor Q8, wherein the power module, the program downloading module, the current detection module and the field effect transistor Q8 are respectively connected with the control module; the current detection module comprises a detection circuit and a sampling resistor R6, and the sampling resistor R6 is connected with the control module through the detection circuit.
In some embodiments of the present invention, the control module includes a transformation circuit and a processing circuit, the transformation circuit includes a voltage regulator U2, a capacitor C2, and a capacitor C3, an input end INT of the voltage regulator U2 is connected to the power module, and an output end OUT of the voltage regulator U2 is connected to the processing circuit; one end of the capacitor C2 is connected with the input end INT of the voltage stabilizer U2, and the other end of the capacitor C2 is grounded; one end of the capacitor C3 is connected to the output terminal OUT of the regulator U2, and the other end of the capacitor C3 is grounded.
In some embodiments of the present invention, the processing circuit includes a processor U3, a resistor R5, a capacitor C5, and a capacitor C7, a reset terminal NRET of the processor U3 is connected to one terminal of the resistor R5, and the other terminal of the resistor R5 is connected to an output terminal OUT of the regulator U2; one end of the capacitor C5 is connected with the reset terminal NRET of the processor U3, and the other end of the capacitor C5 is grounded; one end of the capacitor C7 is connected with a power input end VDD of the processor U3, and the other end of the capacitor C7 is grounded; the power supply input VDD of the processor U3 is connected to the output OUT of the voltage regulator U2.
In some embodiments of the present invention, the current detection module includes a resistor R3, a resistor R4, a resistor R7, and a resistor R8, one end of the resistor R4 is grounded, the other end of the resistor R4 is connected to one end of the sampling resistor R6 through a resistor R3, one end of the resistor R8 is grounded, and the other end of the resistor R8 is connected to the other end of the sampling resistor R6 through a resistor R3; a first differential input terminal AIN1 of the processor U3 is connected to a common terminal of the resistors R3 and R4, and a second differential input terminal AIN2 of the processor U3 is connected to a common terminal of the resistors R7 and R8.
In some embodiments of the present invention, the power module includes a first plug JP1, the first pin, the second pin, and the third pin of the first plug JP1 are respectively connected to the input INT of the voltage regulator U2, and the fourth pin, the fifth pin, and the sixth pin of the first plug JP1 are respectively connected to ground.
In some embodiments of the present invention, the program download module comprises a second plug J1, a first terminal of the second plug J1 is grounded, a second terminal of the second plug J1 is connected to the output terminal OUT of the regulator U2, a third terminal of the second plug J1 is connected to the data line connection SWDIO of the processor U3, and a fourth terminal of the second plug J1 is connected to the clock line connection SWCLK of the processor U3.
In some embodiments of the present invention, the serial communication module further comprises a third plug J2, the first terminal and the second terminal of the third plug J2 are grounded, and the third terminal of the third plug J2 is connected to the PD1 terminal of the processor U3.
In some embodiments of the present invention, the gate of the fet Q8 is connected to the PC3 terminal of the processor U3, and the source of the fet Q8 is connected to the first pin of the first connector JP 1.
In some embodiments of the invention, an alarm device is further included, and the alarm device is connected with the control module.
In some embodiments of the invention, the system further comprises a temperature sensor, and the temperature sensor is connected with the control module.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
a device for preventing LED display screen from spontaneous combustion comprises a control module, a power supply module, a program downloading module, a current detection module and a field effect transistor Q8, wherein the power supply module, the program downloading module, the current detection module and the field effect transistor Q8 are respectively connected with the control module; the current detection module comprises a detection circuit and a sampling resistor R6, and the sampling resistor R6 is connected with the control module through the detection circuit.
The problems that when an LED display screen of a single module is opened, short-circuited or abnormal, the LED display screen cannot be detected and maintained in time, and the LED display screen is black, uncontrolled (partially or totally normally bright) or spontaneous combustion and the like by taking the module as a unit are solved. The design is based on that the LED display screen module is supplied with low-voltage direct current, the voltage is generally between DC3.8V and DC5V, the working current changes along with the display content of the LED display screen, and when the LED display screen displays white color with maximum brightness, the current in the LED display screen module is maximum; the LED display screen is completely displayed in black, and the current is minimum (but not zero) at the moment. The device for preventing the LED display screen from spontaneously combusting is connected in series with the power supply circuit of each module, the current detection module in the device for preventing the LED display screen from spontaneously combusting detects the working current in the corresponding LED display screen module in real time, and the control module is utilized to judge whether the module works normally or not. The specific implementation mode is that the sampling resistor R6 is used as a precision sampling resistor, the detection circuit is used for detecting the voltage on the sampling resistor R6, the control module is used for calculating the real-time current, and then the field-effect tube Q8 is controlled to be switched on and off, so that the purpose of protecting the circuit is achieved, the problems that the LED display screen is black, uncontrolled (partially or totally normally bright) or spontaneous combustion and the like in a module unit are avoided, and the safety is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of an apparatus for preventing spontaneous combustion of an LED display screen according to the present invention;
FIG. 2 is a schematic circuit diagram of a voltage transformation circuit according to the present invention;
FIG. 3 is a circuit schematic of the processing circuit of the present invention;
FIG. 4 is a schematic circuit diagram of the current sensing module of the present invention;
FIG. 5 is a schematic circuit diagram of a power module of the present invention;
FIG. 6 is a schematic circuit diagram of a program download module according to the present invention;
FIG. 7 is a schematic circuit diagram of a serial communication module according to the present invention;
FIG. 8 is a schematic circuit diagram of a FET Q8 of the present invention;
fig. 9 is a flow chart of an apparatus for preventing spontaneous combustion of an LED display panel according to the present invention.
Icon: 1. a control module; 2. a power supply module; 3. a program downloading module; 4. a current detection module; 5. an alarm device; 6. a temperature sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "inside", "outside", etc. are used for indicating the orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention usually place when using, the present invention is only used for convenience of description and simplification of the description, but does not indicate or imply that the devices or elements indicated must have specific orientations, be constructed in specific orientations, and operate, and thus, the present invention should not be construed as being limited. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, "a plurality" represents at least 2.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Examples
Referring to fig. 1, fig. 1 shows a device for preventing spontaneous combustion of an LED display screen according to the present embodiment, which includes a control module 1, a power module 2, a program downloading module 3, a current detecting module 4, and a field effect transistor Q8, wherein the power module 2, the program downloading module 3, the current detecting module 4, and the field effect transistor Q8 are respectively connected to the control module 1; the current detection module 4 comprises a detection circuit and a sampling resistor R6, and the sampling resistor R6 is connected with the control module 1 through the detection circuit.
In some embodiments of the present invention, the problems of black screen, uncontrolled (local or total lighting) or spontaneous combustion of the LED display screen in a module unit are caused by the fact that the LED display screen cannot be detected and maintained in time when an open circuit, a short circuit or other abnormality occurs in the LED display screen of a single module. The design is based on that the LED display screen module is supplied with low-voltage direct current, the voltage is generally between DC3.8V and DC5V, the working current changes along with the display content of the LED display screen, and when the LED display screen displays white color with maximum brightness, the current in the LED display screen module is maximum; the LED display screen is completely displayed in black, and the current is minimum (but not zero) at the moment. The device for preventing the LED display screen from spontaneously combusting is connected in series with the power supply circuit of each module, the current detection module 4 in the device for preventing the LED display screen from spontaneously combusting detects the working current in the corresponding LED display screen module in real time, and the control module 1 is utilized to judge whether the module works normally. The specific implementation mode is that the sampling resistor R6 is used as a precision sampling resistor, the detection circuit is used for detecting the voltage on the sampling resistor R6, the control module 1 is used for calculating the real-time current, and then the field-effect tube Q8 is controlled to be switched on and off, so that the purpose of protecting the circuit is achieved, the problems that the LED display screen is black, uncontrolled (partially or totally normally bright) or spontaneous combustion and the like in a module unit are avoided, and the safety is improved.
Referring to fig. 2, in some embodiments of the present invention, the control module 1 includes a transforming circuit and a processing circuit, the transforming circuit includes a voltage regulator U2, a capacitor C2, and a capacitor C3, an input end INT of the voltage regulator U2 is connected to the power module 2, and an output end OUT of the voltage regulator U2 is connected to the processing circuit; one end of the capacitor C2 is connected with the input end INT of the voltage stabilizer U2, and the other end of the capacitor C2 is grounded; one end of the capacitor C3 is connected to the output terminal OUT of the regulator U2, and the other end of the capacitor C3 is grounded.
In some embodiments of the present invention, the control module 1, which is the core of the device for preventing LED display panel from spontaneous combustion, needs adaptive selection in power supply, wherein the voltage regulator U2, which is model number AMS1117, has the advantages that the AMS1117 series voltage regulator has adjustable version and various fixed voltage versions, and is designed to provide 1A output current and the working pressure difference can be as low as 1V. At maximum output current, the minimum voltage difference of the AMS1117 device is guaranteed not to exceed 1.3V and decreases gradually as the load current decreases. Thereby achieving the purpose of avoiding overcurrent damage caused by overlarge current.
Referring to fig. 3, in some embodiments of the invention, the processing circuit includes a processor U3, a resistor R5, a capacitor C5, and a capacitor C7, a reset terminal NRET of the processor U3 is connected to one terminal of the resistor R5, and the other terminal of the resistor R5 is connected to an output terminal OUT of the regulator U2; one end of the capacitor C5 is connected with the reset terminal NRET of the processor U3, and the other end of the capacitor C5 is grounded; one end of the capacitor C7 is connected with a power input end VDD of the processor U3, and the other end of the capacitor C7 is grounded; the power supply input VDD of the processor U3 is connected to the output OUT of the voltage regulator U2.
In some embodiments of the invention, the processor U3 employs HK32F030M, which has advantages of low cost, fully compatible family, high performance family, and ultra low power consumption. The kernel is M0 CPU, the main frequency supports 48MHZ,16KB-FLASH, over 10 ten thousand times of erasing, SRAM reaches 4K-BYTE, ESD can reach 6000V-8000V. The requirements of the design can be completely met. Therefore, under the condition of meeting the use requirement, the cost is saved, and the cost performance is improved.
Referring to fig. 8, the specific connection mode of the fet is that the gate of the fet Q8 is connected to the PC3 terminal of the processor U3, and the source of the fet Q8 is connected to the first pin of the first connector JP 1.
Referring to fig. 4, the present embodiment provides based on the technical solution of embodiment 1 that the current detection module 4 includes a resistor R3, a resistor R4, a resistor R7, and a resistor R8, one end of the resistor R4 is grounded, the other end of the resistor R4 is connected to one end of a sampling resistor R6 through a resistor R3, one end of the resistor R8 is grounded, and the other end of the resistor R8 is connected to the other end of the sampling resistor R6 through a resistor R3; a first differential input terminal AIN1 of the processor U3 is connected to a common terminal of the resistors R3 and R4, and a second differential input terminal AIN2 of the processor U3 is connected to a common terminal of the resistors R7 and R8.
In some embodiments of the present invention, the current detection module 4 adopts two branches to detect the potentials at the two ends of the sampling resistor R6, so as to determine the voltage by detecting the potential difference at the two ends, and the processor U3 determines whether the voltage is overvoltage, thereby controlling the field effect transistor to be turned on or off. In addition, the resistor R3, the resistor R4, the resistor R7 and the resistor R8 are arranged and used for performing voltage division protection on a circuit, and safety is improved.
Referring to fig. 5, in this embodiment, based on the technical solution of embodiment 1, a power module 2 includes a first plug JP1, a first pin, a second pin, and a third pin of the first plug JP1 are respectively connected to an input end INT of a voltage regulator U2, and a fourth pin, a fifth pin, and a sixth pin of the first plug JP1 are respectively grounded.
In some embodiments of the present invention, the first connector JP1 is of a type VH6-SMD-3.96, and it uses six connection pins, and uses the first pin, the second pin and the third pin of the first connector JP1 to supply power to the processor U3, and the fourth pin, the fifth pin and the sixth pin of the first connector JP1 are grounded, so that the circuit will not harm people even if leakage occurs, and the safety is improved.
Referring to fig. 6, in this embodiment, based on the technical solution of embodiment 1, the program downloading module 3 includes a second plug J1, a first terminal of the second plug J1 is grounded, a second terminal of the second plug J1 is connected to the output terminal OUT of the regulator U2, a third terminal of the second plug J1 is connected to the data line connection terminal SWDIO of the processor U3, and a fourth terminal of the second plug J1 is connected to the clock line connection terminal SWCLK of the processor U3.
In some embodiments of the present invention, since the specific voltage or current values of the control programs are different for different models and types of LED display screens, the program downloading module 3 is configured to import the corresponding programs into the processor U3, and the model standard adopted is H2.0MM 4P for the purpose of acute adaptation as much as possible.
Referring to fig. 7, the present embodiment is provided based on the technical solution of embodiment 1, and further includes a serial communication module, where the serial communication module includes a third plug J2, a first terminal and a second terminal of the third plug J2 are grounded, and a third terminal of the third plug J2 is connected to a PD1 terminal of the processor U3.
In some embodiments of the present invention, the device for preventing the LED display screen from spontaneous combustion may work alone or work in combination with the LED display screen control system in a communication manner, and its specific implementation is that the field effect transistor Q8 is in an off state by default, when the power is turned on, it detects whether the voltage is within a rated range, if not, it continues to turn off the field effect transistor Q8 to protect the LED display screen from being damaged, and transmits the judgment information of the control module 1 to the central control system of the display screen through the serial port communication module to report the fault. If the LED display screen is in the rated range, the field effect transistor Q8 is turned on, whether the current is in the rated range is detected, if the detection result is smaller than the working current, the open-circuit hidden danger exists in the LED display screen, the LED display screen is judged by the control module 1 and then transmitted to a central control system of the display screen through the serial port communication module, and the fault is reported. If the detection result is larger than the working current, the LED display screen has the hidden trouble of short circuit, the field effect transistor Q8 is closed by the control module 1 and is transmitted to a central control system of the display screen for fault reporting.
And meanwhile, during self-checking, the central control system controls the LED display screen to display fixed color contents such as full black, full white, full green and the like, and simultaneously obtains working currents under different colors, and if the working currents are all in a working range, the LED display screen is normal. If the current or the voltage at a certain position is not in the working range, the abnormal LED screen can be judged in advance, so that the damage probability of the LED display screen in the showing process is reduced.
Referring to fig. 9, this embodiment provides based on the technical solution of embodiment 1, and further includes an alarm device 5, where the alarm device 5 is connected to the control module 1.
In some embodiments of the present invention, the alarm device 5 is mainly configured to remind a worker of maintenance, and the specific implementation manner of the present invention is to configure a buzzer to attract the attention of the worker, and further configure an alarm lamp, so that the worker can quickly determine the maintenance position, and the maintenance efficiency is improved.
Referring to fig. 9, the present embodiment is provided based on the technical solution of embodiment 1, and further includes a temperature sensor 6, where the temperature sensor 6 is connected to the control module 1.
In some embodiments of the present invention, the temperature sensor 6 is provided to raise the internal temperature due to the short circuit of the LED display screen or other components, so as to cause spontaneous combustion, and therefore, the temperature sensor 6 is used to monitor, thereby giving an alarm in time, and improving the safety.
In summary, the embodiment of the present invention provides an apparatus for preventing LED display screen from spontaneous combustion, which includes a control module 1, a power module 2, a program downloading module 3, a current detecting module 4 and a field effect transistor Q8, wherein the power module 2, the program downloading module 3, the current detecting module 4 and the field effect transistor Q8 are respectively connected to the control module 1; the current detection module 4 comprises a detection circuit and a sampling resistor R6, and the sampling resistor R6 is connected with the control module 1 through the detection circuit.
The problems that when an LED display screen of a single module is opened, short-circuited or abnormal, the LED display screen cannot be detected and maintained in time, and the LED display screen is black, uncontrolled (partially or totally normally bright) or spontaneous combustion and the like by taking the module as a unit are solved. The design is based on that the LED display screen module is supplied with low-voltage direct current, the voltage is generally between DC3.8V and DC5V, the working current changes along with the display content of the LED display screen, and when the LED display screen displays white color with maximum brightness, the current in the LED display screen module is maximum; the LED display screen is completely displayed in black, and the current is minimum (but not zero) at the moment. The device for preventing the LED display screen from spontaneously combusting is connected in series with the power supply circuit of each module, the current detection module 4 in the device for preventing the LED display screen from spontaneously combusting detects the working current in the corresponding LED display screen module in real time, and the control module 1 is utilized to judge whether the module works normally. The specific implementation mode is that the sampling resistor R6 is used as a precision sampling resistor, the detection circuit is used for detecting the voltage on the sampling resistor R6, the control module 1 is used for calculating the real-time current, and then the field-effect tube Q8 is controlled to be switched on and off, so that the purpose of protecting the circuit is achieved, the problems that the LED display screen is black, uncontrolled (partially or totally normally bright) or spontaneous combustion and the like in a module unit are avoided, and the safety is improved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A device for preventing LED display screen from spontaneous combustion is characterized by comprising a control module, a power supply module, a program downloading module, a current detection module and a field effect transistor Q8, wherein the power supply module, the program downloading module, the current detection module and the field effect transistor Q8 are respectively connected with the control module; the current detection module comprises a detection circuit and a sampling resistor R6, and the sampling resistor R6 is connected with the control module through the detection circuit.
2. The device of claim 1, wherein the control module comprises a transforming circuit and a processing circuit, the transforming circuit comprises a voltage stabilizer U2, a capacitor C2 and a capacitor C3, the input end INT of the voltage stabilizer U2 is connected with the power supply module, and the output end OUT of the voltage stabilizer U2 is connected with the processing circuit; one end of the capacitor C2 is connected with the input end INT of the voltage stabilizer U2, and the other end of the capacitor C2 is grounded; one end of the capacitor C3 is connected to the output terminal OUT of the voltage regulator U2, and the other end of the capacitor C3 is grounded.
3. The device for preventing the spontaneous combustion of the LED display screen as claimed in claim 2, wherein the processing circuit comprises a processor U3, a resistor R5, a capacitor C5 and a capacitor C7, a reset terminal NRET of the processor U3 is connected with one end of a resistor R5, and the other end of the resistor R5 is connected with an output terminal OUT of the voltage regulator U2; one end of the capacitor C5 is connected to the reset NRET of the processor U3, and the other end of the capacitor C5 is grounded; one end of the capacitor C7 is connected with the power input end VDD of the processor U3, and the other end of the capacitor C7 is grounded; the power supply input terminal VDD of the processor U3 is connected with the output terminal OUT of the voltage regulator U2.
4. The device for preventing the LED display screen from spontaneously combusting as claimed in claim 3, wherein the current detection module comprises a resistor R3, a resistor R4, a resistor R7 and a resistor R8, one end of the resistor R4 is grounded, the other end of the resistor R4 is connected with one end of the sampling resistor R6 through the resistor R3, one end of the resistor R8 is grounded, and the other end of the resistor R8 is connected with the other end of the sampling resistor R6 through the resistor R3; the first differential input end AIN1 of the processor U3 is connected with the common end of the resistors R3 and R4, and the second differential input end AIN2 of the processor U3 is connected with the common end of the resistors R7 and R8.
5. The device of claim 3, wherein the power module comprises a first plug JP1, the first pin, the second pin and the third pin of the first plug JP1 are respectively connected to the input INT of the voltage regulator U2, and the fourth pin, the fifth pin and the sixth pin of the first plug JP1 are respectively connected to ground.
6. The apparatus of claim 3, wherein the program downloading module comprises a second plug J1, a first terminal of the second plug J1 is grounded, a second terminal of the second plug J1 is connected to the output OUT of the voltage regulator U2, a third terminal of the second plug J1 is connected to the data line connection SWDIO of the processor U3, and a fourth terminal of the second plug J1 is connected to the clock line connection SWCLK of the processor U3.
7. The device for preventing the spontaneous combustion of the LED display screen according to claim 3, further comprising a serial communication module, wherein the serial communication module comprises a third plug connector J2, the first terminal and the second terminal of the third plug connector J2 are grounded, and the third terminal of the third plug connector J2 is connected with the PD1 terminal of the processor U3.
8. The device for preventing the spontaneous combustion of the LED display screen according to claim 5, wherein the gate of the FET Q8 is connected to the PC3 terminal of the processor U3, and the source of the FET Q8 is connected to the first pin of the first connector JP 1.
9. The device for preventing the spontaneous combustion of the LED display screen according to claim 1, further comprising an alarm device, wherein the alarm device is connected with the control module.
10. The device of claim 1, further comprising a temperature sensor, wherein the temperature sensor is connected to the control module.
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| CN202110810165.5A CN113393807A (en) | 2021-07-18 | 2021-07-18 | Device for preventing LED display screen spontaneous combustion |
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| CN202110810165.5A CN113393807A (en) | 2021-07-18 | 2021-07-18 | Device for preventing LED display screen spontaneous combustion |
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| CN201781298U (en) * | 2009-12-30 | 2011-03-30 | 侯民 | Direct current time controller for large LED display screen |
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Application publication date: 20210914 |