Short-circuit protection circuit and method for LED display screen

Abstract

The invention discloses an LED display screen short circuit protection circuit and method, and the circuit comprises a plurality of relays which are correspondingly connected between a plurality of screen body units and a power supply; the plurality of current detection modules are correspondingly connected between the plurality of screen body units and the relay; the relay control driving module is respectively connected with the plurality of relays so as to control the on-off of the corresponding relays; the sub-controller obtains the real-time current corresponding to each screen body unit detected by the current detection module, compares the real-time current with a preset current, controls the relay control driving module to disconnect the relay corresponding to the corresponding screen body unit when the real-time current is greater than the preset current, so as to cut off the power supply of the power supply to the corresponding screen body unit, and meanwhile, controls the relay control driving module to switch off the relay corresponding to the corresponding screen body unit when the real-time current is greater than the preset current. And sending the acquired current abnormal data to a main controller, so that the main controller sends the current abnormal data to an operation and maintenance end and triggers an alarm system of the operation and maintenance end.

Description

Technical Field

[0001] The present application relates to the technical field of LED display screens, and in particular to a short-circuit protection circuit and method for an LED display screen. Background Art

[0002] Compared with traditional display screens, LED display screens have the advantages of energy saving, environmental protection, long service life, and low management costs, and are increasingly widely used in large-screen display systems, urban lighting projects, etc. Due to possible reasons such as incorrect installation in the early stage, aging of the line, or damage by external forces, during operation, LED display screens are prone to short circuit problems, causing the light bar to burn out. The existing short-circuit protection scheme for LED display screens usually sets grounding protection in the power conversion part of the light bar. When the light bar is short-circuited, the voltage is directly lowered, thereby cutting off the voltage input of the display screen to prevent the light bar from burning out. However, this method may fail to pull down the voltage. Summary of the invention

[0003] The technical problem to be solved by the present application is to provide a short-circuit protection circuit and method for an LED display screen, which can effectively protect the LED display screen when a short circuit occurs and facilitate the operation and maintenance end to handle the short circuit situation.

[0004] In order to solve the above technical problems, this application adopts the technical solution described below.

[0005] On the one hand, the present application provides a short-circuit protection circuit for an LED display screen, wherein the LED display screen includes a plurality of display screens, a plurality of sub-controllers for controlling corresponding display screens, a plurality of power supplies for supplying power to corresponding display screens, and a main controller respectively connected to the plurality of sub-controllers, wherein the display screens are divided into a plurality of screen units, one output of the power supply is connected to a screen unit to supply power to the screen unit, and each display screen is provided with a short-circuit protection circuit for the LED display screen, wherein the short-circuit protection circuit for the LED display screen includes: a plurality of relays correspondingly connected between the plurality of screen units and the power supply; a plurality of current detection modules, Correspondingly connected between the plurality of the screen units and the relays; a relay control drive module, respectively connected to the plurality of the relays, to control the on and off of the corresponding relays; the sub-controller obtains the real-time current corresponding to each screen unit detected by the current detection module, and compares it with a preset current, and when the real-time current is greater than the preset current, controls the relay control drive module to disconnect the relay corresponding to the corresponding screen unit, so as to cut off the power supply to the corresponding screen unit, and at the same time, sends the acquired current abnormality data to the main controller, so that the main controller sends it to the operation and maintenance end and triggers the alarm system of the operation and maintenance end.

[0006] On the other hand, the present application provides a short-circuit protection method for an LED display screen, which includes: a. obtaining the real-time current of each screen unit of the LED display screen; b. comparing the obtained real-time current with a preset current. If the real-time current is greater than the preset current, disconnecting the relay connected between the corresponding screen unit and the power supply to cut off the power supply to the screen unit; c. sending the obtained current abnormality data to the operation and maintenance end, and triggering the alarm system of the operation and maintenance end.

[0007] The beneficial technical effect of the present application is that the disclosed LED display screen short-circuit detection circuit and method, when detecting that the current of the screen unit is abnormal, disconnects the relay arranged between the corresponding screen unit and the power supply, thereby cutting off the power supply of the screen unit with abnormal current, and can disconnect the power supply of the screen unit from the source, thereby reliably playing the role of overcurrent protection, avoiding excessive current and burning the light bar of the screen unit. At the same time, the detected current abnormality data is sent to the operation and maintenance end, and the alarm system of the operation and maintenance end is triggered, which is conducive to the operation and maintenance personnel to take corresponding processing measures in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is the block diagram of LED display.

[0009] Figure 2 It is a flow chart of the short-circuit protection method of the LED display.

[0010] Figure 3 is a flow chart of a method for determining a preset current value. DETAILED DESCRIPTION

[0011] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0012] It should be understood that, unless otherwise clearly specified and limited, in the description of this application, the term "plurality" means two or more; the term "connection" should be understood in a broad sense, which can be a direct connection or an indirect connection through an intermediate medium.

[0013] The present application embodiment discloses a short circuit protection circuit for an LED display screen. Figure 1The LED display screen to which the short-circuit protection circuit is applied comprises a plurality of display screens 10, a plurality of sub-controllers 20 for controlling the corresponding display screens 10, a plurality of power supplies 30 for supplying power to the corresponding display screens 10, and a main controller 40 respectively connected to the plurality of sub-controllers 20, wherein the display screen 10 is divided into a plurality of screen units 11, and one output of the power supply 30 is connected to a screen unit 11 to supply power to the corresponding screen unit 11. Generally, the display screen 10 is composed of a plurality of unit boards 110 spliced ​​together, and the plurality of unit boards 110 are divided into a screen unit 11, and the plurality of unit boards 110 are supplied with power by one output of the power supply 30.

[0014] See also Figure 1 Each display screen 10 is provided with an LED display screen short-circuit protection circuit 50, and the LED display screen short-circuit protection circuit 50 includes a plurality of relays 51, a plurality of current detection modules 52 and a relay control drive module 53, wherein the plurality of relays 51 are correspondingly connected between the plurality of screen units 11 and the power supply 30, and the plurality of current detection modules 52 are correspondingly connected between the plurality of screen units 11 and the relays 51, and the relay control drive module 53 is respectively connected with the plurality of relays 51 to respectively control the on and off of the relays 51, and the sub-controller 20 obtains the real-time current corresponding to each screen unit 11 detected by the current detection module 52, and compares it with a preset current, and when the real-time current is greater than the preset current, controls the relay control drive module 53 to disconnect the relay 51 corresponding to the corresponding screen unit 11, so as to cut off the power supply of the power supply 30 to the corresponding screen unit 11, and at the same time, sends the acquired current abnormality data to the main controller 40, so that the main controller 40 sends it to the operation and maintenance end 60 and triggers the alarm system of the operation and maintenance end 60. Such current abnormality data may include but are not limited to the time when the current abnormality occurs, the abnormal current value, etc.

[0015] The disclosed short-circuit detection circuit of the LED display screen can disconnect the power supply of the screen unit 11 with abnormal current by disconnecting the relay 51 arranged between each screen unit 11 and the power supply 30, thereby disconnecting the power supply of the screen unit 11 from the source, thereby reliably playing the role of overcurrent protection to avoid excessive current from burning out the light bar of the screen unit 11. At the same time, the detected current abnormality data is sent to the operation and maintenance end 60, and the alarm system of the operation and maintenance end 60 is triggered, which is beneficial for the operation and maintenance personnel to take corresponding processing measures in time, such as checking the circuit, replacing the light bar, etc.

[0016] Preferably, the current detection module 52 may use a precision resistor. Of course, in other embodiments, other types of current detection devices such as a Hall current sensor, a magnetoresistive current sensor, etc. may also be used.

[0017] The present application discloses a short circuit protection method for an LED display screen. Figure 2, to illustrate a preferred embodiment of the short-circuit protection method. Figure 1 The LED display screen short-circuit protection circuit shown is used as an actuator, however, it can be understood that the disclosed short-circuit protection method is not limited to being executed by the short-circuit protection circuit.

[0018] S100, obtaining the real-time current of each screen unit 11 of the LED display screen.

[0019] The current detection module 52 disposed between each screen unit 11 and the power source 30 detects the real-time current flowing through the corresponding screen unit 11 and transmits the real-time current to the sub-controller 20 .

[0020] S101 , comparing the acquired real-time current with a preset current, if the real-time current is greater than the preset current, disconnecting the relay 51 connected between the corresponding screen unit 11 and the power supply 30 to cut off the power supply of the power supply 30 to the screen unit 11 .

[0021] The sub-controller 20 obtains the real-time current flowing through the screen unit 11 detected by the current detection module 52, and compares the real-time current with a preset current. If the real-time current is greater than the preset current, it is considered that the corresponding screen unit 11 is short-circuited. At this time, the sub-controller 20 controls the relay control drive module 53 to disconnect the relay 51 corresponding to the corresponding screen unit 11, thereby cutting off the power supply of the power supply 30 to the corresponding screen unit 11, thereby protecting the screen unit 11 from damage due to overcurrent.

[0022] In some embodiments, in combination Figure 3 As shown, the preset current value can be determined by the following method.

[0023] S200 , testing the screen unit 11 to determine the maximum current value that the screen unit 11 can withstand for normal operation.

[0024] S201 , multiplying the maximum current value by a safety factor of 0.8 to determine the preset current value.

[0025] Of course, in other embodiments, the value range of the safety factor can also be determined according to the actual application environment, and the appropriate value range is between 0.7 and 0.9.

[0026] S102 : Send the acquired abnormal current data to the operation and maintenance end 60 , and trigger the alarm system of the operation and maintenance end 60 .

[0027] When a current anomaly is detected, the sub-controller 20 controls the relay control drive module 53 to disconnect the relay 51 corresponding to the corresponding screen unit 11, and at the same time sends the acquired current anomaly data (including the time of occurrence of the current anomaly, the abnormal current value, etc.) to the main controller 40, so that the main controller 40 sends it to the operation and maintenance end 60 and triggers the alarm system of the operation and maintenance end 60. In this way, the operation and maintenance personnel can be informed of the abnormal situation of the LED display screen in time and take corresponding treatment measures in time, such as checking the circuit, replacing the light bar, etc.

[0028] The disclosed LED display screen short-circuit detection method, when detecting that the current of the screen unit 11 is abnormal, disconnects the relay 51 arranged between the corresponding screen unit 11 and the power supply 30, thereby cutting off the power supply of the screen unit 11 with the abnormal current. The power supply of the screen unit 11 can be disconnected from the source, thereby reliably playing the role of overcurrent protection, avoiding excessive current and burning the light bar of the screen unit 11. At the same time, the detected current abnormality data is sent to the operation and maintenance end 60, and the alarm system of the operation and maintenance end 60 is triggered, which is conducive to the operation and maintenance personnel to take corresponding processing measures in time.

[0029] The above description is only a preferred embodiment of the present application, and does not limit the present application in any form. Those skilled in the art can make various equivalent changes and improvements based on the above embodiments, and all equivalent changes or modifications made within the scope of the claims should fall within the protection scope of the present application.

Claims

1. A short-circuit protection circuit for an LED display screen, wherein the LED display screen comprises a plurality of display screens, a plurality of sub-controllers for controlling the corresponding display screens, a plurality of power supplies for supplying power to the corresponding display screens, and a main controller respectively connected to the plurality of sub-controllers, wherein the display screens are divided into a plurality of screen units, and one output of the power supply is connected to one of the screen units to supply power to the screen units, characterized in that: Each display screen body is equipped with an LED display screen short-circuit protection circuit, and the LED display screen short-circuit protection circuit includes: A plurality of relays, correspondingly connected between the plurality of screen units and a power source; A plurality of current detection modules are connected between the plurality of screen units and the relays accordingly; a relay control driving module, connected to the plurality of relays respectively to control the on and off of the corresponding relays; The sub-controller obtains the real-time current corresponding to each screen unit detected by the current detection module, and compares it with a preset current. When the real-time current is greater than the preset current, the relay control drive module is controlled to disconnect the relay corresponding to the corresponding screen unit to cut off the power supply to the corresponding screen unit by the power supply. At the same time, the acquired current abnormality data is sent to the main controller, which is sent by the main controller to the operation and maintenance end and trigger the alarm system of the operation and maintenance end.

2. The LED display screen short circuit protection circuit as claimed in claim 1, characterized in that: The current detection module uses precision resistors.

3. A short circuit protection method for an LED display screen, characterized in that: The LED display screen short circuit protection method includes: a. Obtain the real-time current of each screen unit of the LED display; b. Compare the acquired real-time current with a preset current. If the real-time current is greater than the preset current, disconnect the relay connected between the corresponding screen unit and the power supply to cut off the power supply to the screen unit; c. Send the acquired abnormal current data to the operation and maintenance end and trigger the alarm system of the operation and maintenance end.

4. The LED display screen short circuit protection method according to claim 3, characterized in that: The preset current is determined by the following steps: a. Test the screen unit to determine the maximum current value it can withstand for normal operation; b. Multiply the maximum current value by a safety factor in the range of 0.7 to 0.9 to determine the preset current value.

5. The LED display screen short circuit protection method according to claim 4, characterized in that: The safety factor is set to 0.8.

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