A high-efficiency switching power supply control method and LED display screen

Abstract

The present invention provides a high-efficiency switching power supply control method, comprising the steps of: acquiring an input video, wherein the input video is powered by at least one group of switching power supplies; parsing the input video to obtain current information required for displaying the input video; dynamically controlling the switching power supply corresponding to the input video according to the current information; since the load of the switching power supply is determined by the driving current of the LED screen, and the driving current of the LED screen is determined by the video image input by the LED screen, the present invention acquires the driving current required by the LED screen by real-time acquisition and analysis of the video image input by the LED screen, thereby dynamically controlling the start-up and shutdown of the switching power supply according to the driving current, thereby improving the power supply load rate and reducing power consumption.

Description

Technical Field

[0001] The invention relates to the field of power supply control, and in particular to a high-efficiency switching power supply control method and an LED display screen. Background Art

[0002] The super-large-size TV with direct LED display (displaying directly through the light of LED chips) is a high-performance product developed on the basis of the commercial full-color large-screen LED. With the development of LED display packaging technology, the spacing between LED chips has become smaller, but it still uses the power supply method of the commercial full-color large-screen LED. The super-large-size TV cabinet with direct LED display has seamless splicing technology, so each cabinet unit is powered by an independent switching power supply that converts high-voltage AC power into low-voltage DC power. Among them, each splicing unit cabinet is powered by a switching power supply that converts AC AC power to DC power at the same time, which has the following disadvantages: each cabinet uses a power supply to power it at the same time, and the actual power load rate is about 10% to 15% when playing videos. When the power supply works under 10% to 15% load, the conversion efficiency is very low, resulting in a very large overall energy consumption.

[0003] In addition, the power consumption changes of traditional TV sets have little to do with the video source, but LED direct display TVs are different from traditional TVs. The power consumption of LED direct display TVs depends on the video source. The power consumption of LED direct display TVs is the highest when the picture is particularly white or bright, and the power consumption of LED direct display TVs is very low when the picture displays colors other than white or darker colors. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a high-efficiency switching power supply control method and an LED display screen, thereby improving the power supply load rate and reducing power consumption.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A high-efficiency switching power supply control method comprises the following steps:

[0007] Acquire an input video, wherein the input video is powered by at least one set of switching power supplies;

[0008] Parsing the input video to obtain current information required for displaying the input video;

[0009] The switch power supply corresponding to the input video is dynamically controlled according to the current information.

[0010] In order to solve the above technical problems, another technical solution adopted by the present invention is:

[0011] An LED display screen includes a switching power supply, wherein the switching power supply adopts the high-efficiency switching power supply control method.

[0012] The beneficial effect of the present invention is that since the size of the load of the switching power supply is determined by the driving current of the LED screen, and the driving current of the LED screen is determined by the video image input by the LED screen, the present invention obtains the driving current required by the LED screen by real-time acquisition and analysis of the video image input by the LED screen, thereby dynamically controlling the startup and shutdown of the switching power supply according to the size of the driving current, thereby improving the power supply load rate and reducing power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A flowchart of a high-efficiency switching power supply control method provided by an embodiment of the present invention;

[0014] Figure 2 A program flow chart of a high-efficiency switching power supply control method provided by an embodiment of the present invention;

[0015] Figure 3 A circuit structure diagram of a high-efficiency switching power supply control method provided by an embodiment of the present invention;

[0016] Figure 4 It is a structural diagram of the switch power supply control circuit of the LED display screen described in the background technology;

[0017] Figure 5 A structural diagram of a switching power supply control circuit of an LED display screen provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0019] Please refer to Figure 1 The embodiment of the present invention provides a high-efficiency switching power supply control method, comprising the steps of:

[0020] Acquire an input video, wherein the input video is powered by at least one set of switching power supplies;

[0021] Parsing the input video to obtain current information required for displaying the input video;

[0022] The switch power supply corresponding to the input video is dynamically controlled according to the current information.

[0023] From the above description, it can be seen that the beneficial effect of the present invention is that: since the size of the switching power supply load is determined by the driving current of the LED screen, and the driving current of the LED screen is determined by the video image input by the LED screen, the present invention obtains the driving current required by the LED screen by real-time acquisition and analysis of the video input by the LED screen, thereby dynamically controlling the startup and shutdown of the switching power supply according to the size of the driving current, thereby improving the power supply load rate and reducing power consumption.

[0024] Further, the parsing of the input video to obtain the current information required for displaying the input video includes:

[0025] Obtain pixel coordinates of the input video, and normalize the pixel coordinates according to the RGB three channels of the image to obtain first image data;

[0026] Performing a nonlinear transformation on the first image data to obtain second image data;

[0027] Normalizing the brightness of the second image data to obtain third image data;

[0028] The third image data is converted into electrical data to obtain current information required for displaying the input video.

[0029] From the above description, it can be seen that each input video screen is broken down into individual pixels, and the current data ultimately required for the group of input video screens is calculated based on the data of the individual pixels. This method of breaking down the current data into individual pixels has higher data accuracy and ensures the accuracy of the switching power supply control.

[0030] Furthermore, the nonlinear transformation of the first image data to obtain the second image data is specifically:

[0031] Determine whether the first image data meets the preset condition. If so, the second image data is:

[0032]

[0033] If not, the second image data is:

[0034]

[0035] Among them, the X 1 is the first image data, the X 2 is the second image data, and (x, y) is the pixel coordinate.

[0036] From the above description, it can be seen that the RGB three-channel electrical signals contained in the pixels in the LED display screen are not in a linear relationship with the actual displayed brightness signal. Therefore, when the input video is displayed, the LED screen needs to be linearly adjusted so that the relationship between the image signal of the input video and its current size is linear, which is convenient for obtaining the current relationship of the input video.

[0037] Furthermore, the brightness of the second image data is normalized to obtain the third image data as follows:

[0038] Calculating the total number of pixels of the input video according to the pixel coordinates of the input video;

[0039] The second image data of the input video is brightness normalized according to the total number of pixels to obtain third image data of the input video.

[0040] Furthermore, the brightness of the second image data of the input video is normalized according to the total number of pixels to obtain the third image data of the input video:

[0041]

[0042]

[0043]

[0044] Among them, the L R , L G , L B are respectively the red channel value, green channel value and blue channel value of the third image data; the SUM(X 2(1,1) .R:X 2(x,y) .R) represents the sum of the red channel values ​​of all the second image data in the input video, and the SUM(X 2(1,1) .G:X 2(x,y) .G) represents the sum of the green channel values ​​of all the second image data in the input video, SUM(X 2(1,1) .B:X 2(x,y) .B) represents the sum of the blue channel values ​​of all the second image data in the input video, where (x, y) represents the pixel coordinates and T represents the total number of pixels.

[0045] From the above description, it can be seen that each pixel point includes the values ​​of three color channels, namely red, green and blue. Therefore, the image data of each input video screen can be classified into the sum of the red channel, the sum of the green channel and the sum of the blue channel. Different channels require different current information. The current information of the same channel is combined and calculated to simplify the calculation process and obtain more accurate data.

[0046] Furthermore, the converting of the third image data into electrical data to obtain the current information required for displaying the input video is specifically:

[0047]

[0048] Wherein, A represents the current information, and L R , L G , L B represents the third image data, the A R Indicates the load current when the input video is in single red state, the A G Indicates the load current when the input video is in single green state, the A B Indicates the load current when the input video is in a single blue state.

[0049] From the above description, it can be seen that the actual current information required by each color channel in each input video is added together to obtain the actual current information required by the entire input video, and the load condition of the power supply is calculated based on the actual current information, so as to dynamically control the startup and shutdown of the switching power supply.

[0050] Further, each group of switching power supplies includes a first switching power supply and a second switching power supply;

[0051] The method of dynamically controlling the switch power supply corresponding to the input video according to the current information is specifically:

[0052] The first switch power supply is started, and current information of the first switch power supply is obtained, and it is determined whether the current information of the first switch power supply reaches a preset threshold value. If so, a signal is sent to start the second switch power supply.

[0053] From the above description, it can be seen that, unlike the LED display screen, each light board is powered by a switching power supply, and all the switching power supplies are started at the same time, so the actual power load rate of each switching power supply is lower; the present invention adopts multiple switching power supplies and analyzes the current information of each switching power supply in real time. After the current information of one switching power supply reaches a threshold, another switching power supply is started, and so on, until all the switching power supplies are started, to ensure the load rate of each switching power supply, thereby improving the overall load rate of the LED display screen; and when the load rate does not reach the threshold, other switching power supplies will not be started, thereby reducing power consumption.

[0054] Furthermore, the step of obtaining the input video, wherein the input video is powered by at least one set of switching power supplies, is as follows:

[0055] Obtaining an input video and a screen structure of an LED display screen corresponding to the input video;

[0056] Grouping the input video images according to the screen structure to obtain multiple groups of input video images;

[0057] Each set of input video images is powered by a set of switching power supplies.

[0058] From the above description, it can be seen that by grouping the input video for power supply, the electrical data required for calculating the input video can be more accurate, and the control effect of the switching power supply is good, and it is not easy to make errors and cause confusion in the display effect.

[0059] Furthermore, the screen structure of the LED display screen includes multiple light panels and multiple switching power supplies;

[0060] Each group of input video images is powered by a group of switching power supplies:

[0061] Each set of input video images is displayed by a preset number of light panels;

[0062] Each of the light panels is connected to each switching power supply in the group of switching power supplies.

[0063] From the above description, it can be seen that each switching power supply is connected to a preset number of light boards, that is, each switching power supply supplies power to the preset number of light boards, so the switching power supplies in each group of input video screens can be dynamically controlled. When the load rate is low, only one switching power supply is turned on to power all the light boards in the input video screen. After the current information of the switching power supply reaches the threshold, another switching power supply is started to synchronously power all the light boards in the input video screen, and so on, until all the switching power supplies are started to ensure the load rate of each switching power supply, thereby improving the overall load rate of the LED display screen; and when the load rate does not reach the threshold, other switching power supplies will not be started, thereby reducing power consumption.

[0064] Another embodiment of the present invention provides an LED display screen, including a switching power supply, wherein the switching power supply adopts the high-efficiency switching power supply control method.

[0065] From the above description, it can be seen that the beneficial effect of the present invention is that: since the size of the switching power supply load is determined by the driving current of the LED screen, and the driving current of the LED screen is determined by the video image input by the LED screen, the present invention obtains the driving current required by the LED screen by real-time acquisition and analysis of the video input by the LED screen, thereby dynamically controlling the startup and shutdown of the switching power supply according to the size of the driving current, thereby improving the power supply load rate and reducing power consumption.

[0066] The embodiments of the present invention provide a high-efficiency switching power supply control method and an LED display screen, which can be applied to electronic devices with ultra-large LED direct display to improve the power supply load rate and reduce power consumption. The following is an explanation through specific embodiments:

[0067] Please refer to Figure 1 to Figure 2 , Embodiment 1 of the present invention is:

[0068] A high-efficiency switching power supply control method comprises the following steps:

[0069] S1, obtaining an input video, wherein the input video is powered by at least one set of switching power supplies;

[0070] S2, parsing the input video to obtain current information required for displaying the input video;

[0071] S3. Dynamically control the switch power supply corresponding to the input video according to the current information.

[0072] The S1 is specifically:

[0073] S11, obtaining an input video and a screen structure of an LED display screen corresponding to the input video;

[0074] S12, grouping the input video images according to the screen structure to obtain multiple groups of input video images; each group of input video images is powered by a group of switching power supplies.

[0075] Wherein, the screen structure of the LED display screen includes multiple light panels and multiple switching power supplies.

[0076] It should be noted that a switching power supply is correspondingly arranged under each light board, and the LED display screen is composed of multiple light boards in an array structure.

[0077] Each group of input video images is powered by a group of switching power supplies:

[0078] Each set of input video images is displayed by a preset number of light panels;

[0079] Each of the light panels is connected to each switching power supply in the group of switching power supplies.

[0080] Each group of input video images is powered by at least one switching power supply.

[0081] Specifically, S2 includes:

[0082] S21, obtaining pixel coordinates of the input video, and normalizing the pixel coordinates according to the RGB three channels of the image to obtain first image data;

[0083] S22, performing nonlinear transformation on the first image data to obtain second image data;

[0084] The S22 is specifically:

[0085] Determine whether the first image data meets the preset condition. If so, the second image data is:

[0086]

[0087] If not, the second image data is:

[0088]

[0089] Among them, the X 1 is the first image data, the X 2 is the second image data.

[0090] S23, normalizing the brightness of the second image data to obtain third image data;

[0091] The S23 is specifically:

[0092] S231, calculating the total number of pixels of the input video according to the pixel coordinates of the input video;

[0093] S232. Normalize the brightness of the second image data of the input video according to the total number of pixels to obtain third image data of the input video.

[0094] The S232 is specifically:

[0095]

[0096]

[0097]

[0098] Among them, the L R , L G , L B are respectively the red channel value, green channel value and blue channel value of the third image data; the SUM(X 2 (1,1).R:X 2 (x, y).R) represents the sum of the red channel values ​​of all the second image data in the input video, and SUM(X 2 (1,1).G:X 2 (x, y). G) represents the sum of the green channel values ​​of all the second image data in the input video, SUM(X 2 (1,1).B:X 2(x, y).B) represents the sum of the blue channel values ​​of all second image data in the input video, where (x, y) represents the pixel coordinates, and T represents the total number of pixels.

[0099] S24, converting the third image data into electrical data to obtain current information required for displaying the input video.

[0100] The S24 is specifically:

[0101]

[0102] Wherein, A represents the current information, and L R , L G , L B represents the third image data, the A R Indicates the load current when the input video is in single red state, the A G Indicates the load current when the input video is in single green state, the A B Indicates the load current when the input video is in a single blue state.

[0103] Wherein, each group of switching power supplies includes a first switching power supply and a second switching power supply;

[0104] The method of dynamically controlling the switch power supply corresponding to the input video according to the current information is specifically:

[0105] The first switch power supply is started, and current information of the first switch power supply is obtained, and it is determined whether the current information of the first switch power supply reaches a preset threshold value. If so, a signal is sent to start the second switch power supply.

[0106] It should be noted that the first switching power supply and the second switching power supply only represent the order of starting up in each group of switching power supplies, and do not limit the number of switching power supplies. Due to differences in product models, box sizes, switching power supply power and load performance, the specific number of switching power supplies required as a group needs to be determined based on the actual product.

[0107] Please refer to Figures 3 to 5 , Embodiment 2 of the present invention is:

[0108] A high-efficiency switching power supply control method is applied to an LED display screen with a resolution of 1920×1080, comprising the steps of:

[0109] D1. Obtain an input video and a screen structure of an LED display screen corresponding to the input video.

[0110] It should be noted that the input video is composed of images input one by one at a certain frequency.

[0111] In this embodiment, the screen structure includes 16 light boards and 16 switch power supplies, and each light board is provided with a switch power supply. Figure 3 and Figure 5 The screen structure is divided into 4 groups vertically, and each switching power supply is connected to all the light boards in its corresponding group.

[0112] In an optional implementation, the screen structure array is divided into 4 groups.

[0113] D2. According to the screen structure, the image is divided into four groups vertically, corresponding to the power supply groups of the above screen structure one by one, and each group of input video is powered by at least one switching power supply.

[0114] It should be noted that the LED display screen and the image are composed of single pixels. After image segmentation, the pixel coordinates of each group of images on the LED display screen are: 1 ~x 480 ,y 0 ~y 1080 ), the second set of images (x 481 ~x 960 ,y 0 ~y 1080 ), the third set of images (x 961 ~x 1440 ,y 0 ~y 1080 ), the fourth group of images (x 1441 ~x 1920 ,y 0 ~y 1080 )

[0115] D3. Obtain pixel coordinates of four groups of images, and normalize the pixel coordinates according to the RGB three channels of the images to obtain first image data.

[0116] Each pixel is composed of the three primary colors of RGB. In the image composition, the three channels are represented by R(0~255), G(0~255), and B(0~255). Among them, RGB(0,0,0) means that the pixel is the blackest, RGB(255,255,255) means that the pixel is the whitest, RGB(255,0,0) means that the pixel is the reddest, RGB(0,255,0) means that the pixel is the greenest, and RGB(0,0,255) means that the pixel is the bluest.

[0117] Taking the pixel coordinates of the first group of images as an example, before normalization, the pixel coordinates of the first group of images are expressed using RGB three channels as follows:

[0118]

[0119] Among them, (x, y) represents the pixel coordinates, R (x,y) , G (x,y) , B (x,y) Respectively represent the red channel value, green channel value and blue channel value of the pixel;

[0120] After normalizing the above data, the first image data of the first group of images is:

[0121]

[0122] The other three groups of images are normalized in the same way.

[0123] D4. Perform nonlinear transformation on the first image data of the four groups of images to obtain corresponding second image data.

[0124] In this embodiment, the nonlinear transformation adopts the GAMMA conversion method; the LED display screen is calibrated according to the ITU-R BT.709 standard, and then judging whether the first image data meets the preset condition is specifically: judging whether the first image data is less than 0.81; therefore,

[0125] When X 1(x,y) <0.81, the second image data

[0126] When X 1(x,y) ≧0.81, the second image data

[0127] The other three groups of images are transformed nonlinearly in the same way.

[0128] D5. Normalize the brightness of the second image data of the four groups of images to obtain corresponding third image data.

[0129] The second image data is independent pixel data, which is linearly related to the brightness data of the corresponding pixel. In this embodiment, four power supplies form a group, and the pixels in the same group belong to a unified entity. Therefore, the brightness data of each pixel in the same group should be normalized. Specifically, there are 1028×480=493440 pixels in the first group of images, and the brightness normalization process is as follows:

[0130]

[0131]

[0132]

[0133] Among them, the L R , L G , L B are respectively the red channel value, green channel value and blue channel value of the third image data; the SUM(X 2(1,1) .R:X 2(x,y) .R) represents the sum of the red channel values ​​of all the second image data in the input video, and the SUM(X 2(1,1) .G:X 2(x,y) .G) represents the sum of the green channel values ​​of all the second image data in the input video, SUM(X 2(1,1) .B:X 2(x,y) .B) represents the sum of the blue channel values ​​of all the second image data in the input video, where (x, y) represents the pixel coordinates and T represents the total number of pixels.

[0134] The brightness normalization process of the other three groups of images is performed in the same way.

[0135] D6. Convert the third image data of the four groups of images into electrical data to obtain the current information required for displaying the image:

[0136]

[0137] Wherein, A represents the current information, and L R , L G , L B represents the third image data, the A R Indicates the load current when the input video is in single red state, the A G Indicates the load current when the input video is in single green state, the A B Indicates the load current when the input video is in a single blue state.

[0138] D7. Dynamically control the switch power supply corresponding to each group of images according to the current information corresponding to the image.

[0139] It should be noted that the reliability of a general switching power supply is best when the load rate is below 80%. Therefore, in this embodiment, the preset threshold is 80%. max , where A max The maximum load current of a switching power supply for LED;

[0140] When video is input, the first switching power supply is started to supply power:

[0141] If A<80%A max When the first switch power supply is on, the other switch power supplies are turned off;

[0142] If 80% Amax ≦A<2×80%A max , then start the second switching power supply to supply power;

[0143] If 2×80%A max ≦A<3×80%A max , then start the third switch power supply to supply power;

[0144] If 3×80%A max ≦A<4×80%A max , then start the fourth switching power supply to supply power.

[0145] The remaining three groups of switching power supplies are dynamically controlled in the same way.

[0146] In this embodiment, with the data information of the dynamic control of the switching power supply, the data information needs to be sent to the power supply control end. The sending end and the receiving end use a consistent communication protocol. The control data to be transmitted includes 4 signal states, which can be represented by 8-bit data. Each signal state occupies 2 data bits. The signal states are:

[0147] 00: One power supply is working;

[0148] 01: Both power supplies are working;

[0149] 10: Three power supplies are working;

[0150] 11: Four power supplies are working.

[0151] Reference Figure 3 After the MCU control chip directly decodes the received data, it drives and controls the working status of the four groups of switching power supplies respectively, thereby achieving the purpose of dynamically controlling the switching power supplies.

[0152] Please refer to Figure 4 and Figure 5 , Embodiment 3 of the present invention is:

[0153] An LED display screen includes a switching power supply, wherein the switching power supply adopts a high-efficiency switching power supply control method described in the first and second embodiments.

[0154] Reference Figure 4 In the existing technical solution, all switching power supply inputs are linked, and each switching power supply supplies power to each light board separately. When the equipment is started, all switching power supplies work at the same time, and the average load rate of each power supply is about 10% to 15%, which is relatively low in efficiency;

[0155] Reference Figure 5In this embodiment, the switching power supply adopts a high-efficiency switching power supply control method described in Example 2. Every 4 switching power supplies are divided into a group, one of which is started when the device is turned on, and the other three switching power supplies are dynamically turned on according to the collected image information. Each switching power supply supplies power to all light boards, thereby achieving a power load rate of between 40% and 60%, with high efficiency, and saving about 8% to 10% of the overall power consumption.

[0156] In summary, the present invention provides a high-efficiency switch power supply control method and LED display screen. Since the load of the switch power supply is determined by the driving current of the LED screen, and the driving current of the LED screen is determined by the video image input by the LED screen, the present invention acquires the driving current required by the LED screen by real-time acquisition and analysis of the video input by the LED screen, thereby dynamically controlling the start and shut down of the switch power supply according to the size of the driving current, thereby improving the power load rate and reducing power consumption. Different from the prior art LED display screen, each light board is powered by a switch power supply, and when the video is input, all the switch power supplies are started at the same time for display, so that the actual power load rate of each switch power supply is low, and the power efficiency is low; the present invention adopts multiple switch power supplies to supply power together, and analyzes the current information of each switch power supply in real time. After the current information of one switch power supply reaches the threshold, another switch power supply is started, and so on, until all the switch power supplies are started, to ensure the load rate of each switch power supply, thereby improving the overall load rate of the LED display screen; when the power load rate does not reach the threshold, other switch power supplies will not be started, thereby reducing the overall power consumption of the LED display screen.

[0157] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A high-efficiency switching power supply control method, characterized in that: Includes steps: Acquire an input video, wherein the input video is powered by at least one set of switching power supplies; Parsing the input video to obtain current information required for displaying the input video; Dynamically controlling a switch power supply corresponding to the input video according to the current information; The parsing of the input video to obtain the current information required for displaying the input video includes: Obtain pixel coordinates of the input video, and normalize the pixel coordinates according to the RGB three channels of the image to obtain first image data; Performing a nonlinear transformation on the first image data to obtain second image data; Normalizing the brightness of the second image data to obtain third image data; Converting the third image data into electrical data to obtain current information required for displaying the input video; The nonlinear transformation of the first image data to obtain the second image data is specifically: Determine whether the first image data is less than a standard threshold. If so, the second image data is: ； If not, the second image data is: ； Among them, the X 1 is the first image data, X 2 is the second image data, the ( x,y ) is the pixel coordinate; The brightness normalization of the second image data to obtain the third image data is specifically: Calculating the total number of pixels of the input video according to the pixel coordinates of the input video; Normalizing the brightness of the second image data of the input video according to the total number of pixels to obtain third image data of the input video; Normalizing the brightness of the second image data of the input video according to the total number of pixels to obtain the third image data of the input video is specifically: ； ； ; Among them, the L R 、L G 、L B are respectively the red channel value, the green channel value and the blue channel value of the third image data; SUM(X 2（1,1） .R:X 2（x,y） .R） represents the sum of the red channel values ​​of all the second image data in the input video, SUM(X 2（1,1） .G:X 2（x,y） .G） represents the sum of the green channel values ​​of all second image data in the input video, SUM （X 2（1,1） .B:X 2（x,y） .B） represents the sum of the blue channel values ​​of all the second image data in the input video, where ( x,y ) represents the pixel coordinates, and T represents the total number of pixels; The converting of the third image data into electrical data to obtain the current information required for displaying the input video is specifically: Among them, the A represents the current information, the L R 、L G 、L B are respectively the red channel value, the green channel value and the blue channel value of the third image data, A R Indicates the load current when the input video is in a single red state, A G Indicates the load current when the input video is in single green state, A B Indicates the load current when the input video is in a single blue state; Each set of switching power supplies includes a first switching power supply and a second switching power supply; The method of dynamically controlling the switch power supply corresponding to the input video according to the current information is specifically: The first switch power supply is started, and current information of the first switch power supply is obtained, and it is determined whether the current information of the first switch power supply reaches a preset threshold value. If so, a signal is sent to start the second switch power supply.

2. A high-efficiency switching power supply control method according to claim 1, characterized in that: The acquiring of the input video, wherein the input video is powered by at least one set of switching power supplies, is specifically: Obtaining an input video and a screen structure of an LED display screen corresponding to the input video; Grouping the input video images according to the screen structure to obtain multiple groups of input video images; Each set of input video images is powered by a set of switching power supplies.

3. A high-efficiency switching power supply control method according to claim 2, characterized in that: The screen structure of the LED display screen includes multiple light panels and multiple switching power supplies; Each group of input video images is powered by a group of switching power supplies: Each set of input video images is displayed by a preset number of light panels; Each of the lamp panels is connected to each switching power supply in the group of switching power supplies.

4. An LED display screen, characterized in that: It comprises a switching power supply, and the switching power supply adopts a high-efficiency switching power supply control method as described in any one of claims 1 to 3.

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