LED display screen, power supply module for LED display screen and HUB board

Abstract

The embodiment of the utility model provides an LED display screen, a power supply module for the LED display screen and a HUB board, and relates to the technical field of display. According to the LED display screen, the problem of blank screen generation in the use process can be avoided. The LED display screen comprises a plurality of box bodies, a power line, a first network cable and a second network cable, each box body comprises a power supply module and a display module, and the power supply output end of the power supply module is electrically connected with the power supply end of the display module; the power line is connected with the main power ends of the plurality of power modules, and the power line is configured to be used for connecting the box body with alternating current; the first network cable is in cascade connection with the display control cards respectively configured in the plurality of box bodies and is used for transmitting data signals and control signals to the display modules in the plurality of box bodies; and the second network cable is cascaded with the standby power supply ends of the plurality of power supply modules.

Description

Technical Field

[0001] The utility model relates to the technical field of display, in particular to an LED display screen, a power module and a HUB board used for the LED display screen. Background Art

[0002] With the development of display technology, its application areas are becoming more and more extensive. At the same time, the development trend of the display industry is simpler structure and more convenient installation and maintenance.

[0003] At present, the LED display screens used in some large venues are composed of many independent boxes. When the power supply in one of the boxes is damaged and has no output, the corresponding box will stop supplying power and a black screen will appear. In order to solve the above problems, the prior art usually sets two power supplies in one box. When one power supply is damaged, the other power supply can still work to ensure normal display. However, each box needs to place an extra power module, which will increase the cost, and the box occupies a large area, which is not conducive to further promotion; at the same time, when both power supplies in the same box are damaged, there will still be a situation where power cannot be supplied and a black screen occurs. Utility Model Content

[0004] The embodiment of the utility model provides an LED display screen, a power module and a HUB board used for the LED display screen, and the LED display screen can avoid the problem of a black screen during use.

[0005] In a first aspect, some embodiments of the present application provide an LED display screen, which includes: a plurality of boxes, a power cord, a first network cable, and a second network cable; each of the boxes includes a power module and a display module, and the power output end of the power module is electrically connected to the power end of the display module; the power cord is connected to the main power end of the plurality of power modules, and the power cord is configured to connect the box to alternating current; the first network cable cascades the display control cards respectively configured in the plurality of boxes, and is used to transmit data signals and control signals for the display modules in the plurality of boxes; the second network cable cascades the backup power ends of the plurality of power modules;

[0006] The power module is configured to receive the alternating current through the main power supply end, generate a first direct current based on the alternating current, and output the first direct current to the display module through the power output end; and / or generate a second direct current based on the alternating current, and transmit the second direct current to the second network cable through the backup power supply end; or, the power module is configured to receive the second direct current transmitted by the second network cable through the backup power supply end, convert the second direct current into a third direct current, and transmit the third direct current to the display module through the power output end; wherein, the first direct current and the third direct current are direct currents that can drive the box to work.

[0007] Based on the above scheme, some embodiments of the present application provide an LED display screen, which provides data signals and control signals to the display module through a first network cable, and transmits a second DC current equalization power supply through a second network cable, so that the LED display screen can operate normally regardless of whether there is a power module failure, so that the LED display screen can display normally.

[0008] In some embodiments, the power supply module includes: a main power supply circuit, a backup power supply circuit and a switching circuit; the main power supply circuit includes an input end, a first output end and a second output end; the input end of the main power supply circuit is connected to the main power supply end of the power supply module, the input end of the main power supply circuit is configured to receive the alternating current, the first output end of the main power supply circuit is configured to output the first direct current, and the second output end of the main power supply circuit is configured to output the second direct current.

[0009] The backup power supply circuit includes a first input end, a second input end, a first output end, and a second output end: the first input end of the backup power supply circuit is connected to the second output end of the main power supply circuit, the first output end of the backup power supply circuit is connected to the backup power supply end of the power supply module, and the second input end of the backup power supply circuit is connected to the backup power supply end of the power supply module; the first input end of the backup power supply circuit is configured to receive the second direct current, the first output end of the backup power supply circuit is configured to output the second direct current, the second input end of the backup power supply circuit is configured to receive the second direct current transmitted by the second network cable, and the second output end of the backup power supply circuit is configured to output the third direct current.

[0010] The switching circuit includes a first input terminal, a second input terminal and an output terminal, the first input terminal of the switching circuit is connected to the first output terminal of the main power supply circuit, the second input terminal of the switching circuit is connected to the second output terminal of the backup power supply circuit, and the output terminal of the switching circuit is electrically connected to the power output terminal of the power supply module; the switching circuit is configured to transmit the first direct current to the output terminal in response to the first direct current received at the first input terminal, or to transmit the third direct current to the output terminal in response to the third direct current received at the second input terminal.

[0011] In some embodiments, the main power supply circuit includes: a first transistor, a second transistor, a transformer, a first diode, a second diode, a third diode and a fourth diode; the control end of the first transistor is electrically connected to the first pulse voltage, the first end of the first transistor is electrically connected to the first power supply end, the second end of the first transistor is electrically connected to the first end of the second transistor, and is also electrically connected to the first input end of the transformer; the control end of the second transistor is electrically connected to the first pulse voltage, the second end of the second transistor is electrically connected to the first ground end, and is also electrically connected to the second input end of the transformer; the positive end of the first diode is electrically connected to the first output end of the transformer, and the negative end of the first diode is electrically connected to the first output end of the main power supply circuit; the positive end of the second diode is electrically connected to the second output end of the transformer, and the negative end of the second diode is electrically connected to the first output end of the main power supply circuit; the positive end of the third diode is electrically connected to the third output end of the transformer, and the negative end of the third diode is electrically connected to the second output end of the main power supply circuit; the positive end of the fourth diode is electrically connected to the fourth output end of the transformer, and the negative end of the fourth diode is electrically connected to the second output end of the main power supply circuit.

[0012] In some embodiments, the main power supply circuit also includes: a first capacitor, a second capacitor and a third capacitor; the first end of the first capacitor is electrically connected to the second output end of the main power supply circuit, and the second end of the first capacitor is electrically connected to the second ground end; the first end of the second capacitor is electrically connected to the first output end of the main power supply circuit, and the second end of the second capacitor is electrically connected to the second ground end; the first end of the third capacitor is electrically connected to the second input end of the transformer, and the second end of the third capacitor is electrically connected to the first ground end.

[0013] In some embodiments, the backup power supply circuit includes: a conversion circuit; the input end of the conversion circuit is electrically connected to the second input end of the backup power supply circuit, and the output end of the conversion circuit is electrically connected to the second output end of the backup power supply circuit; the conversion circuit is configured to convert the second direct current into the third direct current; the first input end of the backup power supply circuit is connected to the first output end.

[0014] In some embodiments, the conversion circuit includes: a control chip, a charging circuit, an inductor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a fourth capacitor, and a fifth capacitor; the first control terminal of the control chip is electrically connected to the second end of the first resistor and is also electrically connected to the first end of the second resistor; the power supply terminal of the control chip is electrically connected to the first end of the fourth capacitor; the second end of the fourth capacitor is electrically connected to the second end of the second resistor and is also electrically connected to the ground terminal; the first end of the first resistor is electrically connected to the input terminal of the conversion circuit; the second control terminal of the control chip is electrically connected to the first end of the charging circuit; the output terminal of the control chip is electrically connected to the first end of the inductor, and the second end of the charging circuit is electrically connected to the output terminal of the control chip; the second end of the inductor is electrically connected to the output terminal of the conversion circuit; the feedback terminal of the control chip is electrically connected to the second end of the third resistor, the first end of the fourth resistor, the first end of the fifth resistor and the second end of the fifth capacitor; the first end of the third resistor is electrically connected to the first end of the fifth capacitor and is also electrically connected to the output terminal of the conversion circuit; the second end of the fourth resistor and the second end of the fifth resistor are electrically connected to the ground terminal.

[0015] In some embodiments, the switching circuit includes: a first switching circuit and a second switching circuit; the input end of the first switching circuit is electrically connected to the first input end of the switching circuit, and the output end of the first switching circuit is electrically connected to the power supply end of the display module; the input end of the second switching circuit is electrically connected to the second input end of the switching circuit, and the output end of the second switching circuit is electrically connected to the power supply end of the display module; the first switching circuit is configured to, in response to the first direct current received at the input end of the first switching circuit, be turned on to transmit the first direct current to the output end of the first switching circuit; the second switching circuit is configured to, in response to the third direct current received at the input end of the second switching circuit, be turned on to transmit the third direct current to the output end of the second switching circuit.

[0016] In some embodiments, the first switching circuit includes: a third transistor, a fourth transistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a fifth diode, a sixth diode, a sixth capacitor, a seventh capacitor and an eighth capacitor.

[0017] The control end of the third transistor is electrically connected to the second end of the sixth capacitor, the second end of the seventh capacitor, the second end of the eighth resistor, the first end of the seventh resistor and the negative terminal of the fifth diode; the first end of the third transistor is electrically connected to the first input end of the switching circuit, the first end of the sixth resistor and the first end of the sixth capacitor; the second end of the third transistor is electrically connected to the first end of the seventh capacitor, the first end of the eighth resistor and the power supply end of the display module.

[0018] The control end of the fourth transistor is electrically connected to the second end of the ninth resistor, the first end of the tenth resistor and the first end of the eighth capacitor; the first end of the fourth transistor is electrically connected to the negative end of the sixth diode; the second end of the fourth transistor is electrically connected to the second end of the eighth capacitor, the second end of the tenth resistor, and the ground end. The positive end of the sixth diode is electrically connected to the second end of the sixth resistor, the second end of the seventh resistor and the positive end of the fifth diode.

[0019] The second switching circuit includes: a fifth transistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a seventh diode, a ninth capacitor and a tenth capacitor. The control end of the fifth transistor is electrically connected to the second end of the twelfth resistor, the first end of the thirteenth resistor, the negative end of the seventh diode, the first end of the ninth capacitor and the first end of the tenth capacitor; the first end of the fifth transistor is electrically connected to the second input end of the switching circuit, the second end of the eleventh resistor and the second end of the ninth capacitor; the second end of the fifth transistor is electrically connected to the second end of the tenth capacitor, the second end of the thirteenth resistor and the power supply end of the display module; the positive end of the seventh diode is electrically connected to the first end of the eleventh resistor and the first end of the twelfth resistor.

[0020] In some embodiments, the power module further includes an electromagnetic compatibility circuit; an input end of the electromagnetic compatibility circuit is electrically connected to a backup power end of the power module, and an output end of the electromagnetic compatibility circuit is electrically connected to an input end of the main power circuit.

[0021] In a second aspect, some embodiments of the present application provide a power module for an LED display screen, the power module for an LED display screen comprising: a plurality of boxes. The boxes comprise the power modules and display modules connected to each other, the power modules are used to connect the boxes to an external circuit, and the external circuit is used to provide power to the boxes; the power module for an LED display screen comprises: a main power circuit, a backup power circuit and a switching circuit.

[0022] The main power supply circuit includes an input end, a first output end and a second output end. The input end of the main power supply circuit is connected to a power line, and the power line is configured to connect the box to alternating current. The main power supply circuit is configured to receive the alternating current and generate a first direct current according to the alternating current, and output the first direct current from the first output end, and / or generate the second direct current according to the alternating current, and output the second direct current from the second output end; wherein the first direct current is direct current that can drive the box to work, and the box includes a display control card for providing data signals and control signals to the display module, and the display control cards of each of the boxes are cascaded via a first network cable.

[0023] The backup power supply circuit includes a first input end, a second input end, a first output end, and a second output end. The first input end of the backup power supply circuit is connected to the second output end of the main power supply circuit. The first output end of the backup power supply circuit is used to connect to the second input end of the backup power supply circuit of the power supply module of other boxes in the LED display screen through a second network cable; the second input end of the backup power supply circuit is used to connect to the two output ends of the backup power supply circuit of the power supply module of other boxes in the LED display screen through the second network cable; the backup power supply circuit is configured to receive the second direct current and transmit the second direct current to the second network cable, or receive the second direct current transmitted by the second network cable, convert the second direct current transmitted by the second network cable into a third direct current and output it from the second output end, wherein the third direct current is direct current that can drive the box to work.

[0024] The switching circuit includes a first input terminal, a second input terminal and an output terminal, the first input terminal of the switching circuit is connected to the first output terminal of the main power supply circuit, the second input terminal of the switching circuit is connected to the second output terminal of the backup power supply circuit, and the output terminal of the switching circuit is electrically connected to the display module; the switching circuit is configured to, in response to a first direct current received at the first input terminal, transmit the first direct current to the output terminal to power the display module, or, in response to a third direct current received at the second input terminal, transmit the third direct current to the output terminal to power the display module.

[0025] The beneficial effects of the power module for the LED display are the same as the beneficial effects of the LED display described above, and will not be described in detail here.

[0026] In some embodiments, the main power supply circuit includes a first transistor, a second transistor, a transformer, a first diode, a second diode, a third diode, a fourth diode, a first capacitor, a second capacitor and a third capacitor; the control end of the first transistor is electrically connected to the first pulse voltage, the first end of the first transistor is electrically connected to the first power supply end, the second end of the first transistor is electrically connected to the first end of the second transistor, and is also electrically connected to the first input end of the transformer.

[0027] The control end of the second transistor is electrically connected to the first pulse voltage, the second end of the second transistor is electrically connected to the first ground end, and is also electrically connected to the second input end of the transformer; the positive end of the first diode is electrically connected to the first output end of the transformer, and the negative end of the first diode is electrically connected to the first output end of the main power supply circuit; the positive end of the second diode is electrically connected to the second output end of the transformer, and the negative end of the second diode is electrically connected to the first output end of the main power supply circuit; the positive end of the third diode is electrically connected to the third output end of the transformer, and the negative end of the third diode is electrically connected to the second output end of the main power supply circuit; the positive end of the fourth diode is electrically connected to the fourth output end of the transformer, and the negative end of the fourth diode is electrically connected to the second output end of the main power supply circuit.

[0028] The first end of the first capacitor is electrically connected to the second output end of the main power supply circuit, and the second end of the first capacitor is electrically connected to the second ground end; the first end of the second capacitor is electrically connected to the first output end of the main power supply circuit, and the second end of the second capacitor is electrically connected to the second ground end; the first end of the third capacitor is electrically connected to the second input end of the transformer, and the second end of the third capacitor is electrically connected to the first ground end.

[0029] In some embodiments, the backup power supply circuit includes a conversion circuit; the conversion circuit includes: a control chip, a charging circuit, an inductor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a fourth capacitor, and a fifth capacitor; the first control end of the control chip is electrically connected to the second end of the first resistor, and is also electrically connected to the first end of the second resistor; the power supply end of the control chip is electrically connected to the first end of the fourth capacitor; the second end of the fourth capacitor is electrically connected to the second end of the second resistor, and is also electrically connected to the ground end; the first end of the first resistor is electrically connected to the input end of the conversion circuit.

[0030] The second control end of the control chip is electrically connected to the first end of the charging circuit; the output end of the control chip is electrically connected to the first end of the inductor, and the second end of the charging circuit is electrically connected to the output end of the control chip; the second end of the inductor is electrically connected to the output end of the conversion circuit; the feedback end of the control chip is electrically connected to the second end of the third resistor, the first end of the fourth resistor, the first end of the fifth resistor and the second end of the fifth capacitor; the first end of the third resistor is electrically connected to the first end of the fifth capacitor, and is also electrically connected to the output end of the conversion circuit; the second end of the fourth resistor and the second end of the fifth resistor are electrically connected to the ground end.

[0031] In some embodiments, the switching circuit includes: a third transistor, a fourth transistor, a fifth transistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fifth diode, a sixth diode, a seventh diode, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor and a tenth capacitor.

[0032] The control end of the third transistor is electrically connected to the second end of the sixth capacitor, the second end of the seventh capacitor, the second end of the eighth resistor, the first end of the seventh resistor and the negative terminal of the fifth diode; the first end of the third transistor is electrically connected to the first input end of the switching circuit, the first end of the sixth resistor and the first end of the sixth capacitor; the second end of the third transistor is electrically connected to the first end of the seventh capacitor, the first end of the eighth resistor and the power supply end of the display module.

[0033] The control end of the fourth transistor is electrically connected to the second end of the ninth resistor, the first end of the tenth resistor and the first end of the eighth capacitor; the first end of the fourth transistor is electrically connected to the negative terminal of the sixth diode; the second end of the fourth transistor is electrically connected to the second end of the eighth capacitor, the second end of the tenth resistor, and the ground terminal.

[0034] The positive terminal of the sixth diode is electrically connected to the second end of the sixth resistor, the second end of the seventh resistor and the positive terminal of the fifth diode; the control terminal of the fifth transistor is electrically connected to the second end of the twelfth resistor, the first end of the thirteenth resistor, the negative terminal of the seventh diode, the first end of the ninth capacitor and the first end of the tenth capacitor; the first end of the fifth transistor is electrically connected to the second input terminal of the switching circuit, the second end of the eleventh resistor and the second end of the ninth capacitor; the second end of the fifth transistor is electrically connected to the second end of the tenth capacitor, the second end of the thirteenth resistor and the power supply terminal of the display module; the positive terminal of the seventh diode is electrically connected to the first end of the eleventh resistor and the first end of the twelfth resistor.

[0035] In a third aspect, some embodiments of the present application provide a HUB board for an LED display screen, wherein the HUB board is used for a box in the LED display screen, wherein the box includes a display module, and the HUB board includes: the above-mentioned power module; and a display control card, which is used to provide data signals and control signals to the display module, and the display control cards of each box are cascaded via a first network cable.

[0036] The beneficial effects of the HUB board used for the LED display are the same as the beneficial effects of the LED display board described above, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0038] Figure 1 A schematic diagram of an existing LED display screen provided in an embodiment of the present application;

[0039] Figure 2 A circuit block diagram of an LED display screen provided in an embodiment of the present application;

[0040] Figure 3 A structural block diagram of a power module provided in an embodiment of the present application;

[0041] Figure 4 A structural block diagram of another power supply module provided in an embodiment of the present application;

[0042] Figure 5 A structural block diagram of another power supply module provided in an embodiment of the present application;

[0043] Figure 6 A structural block diagram of another power supply module provided in an embodiment of the present application;

[0044] Figure 7 A circuit diagram of a main power supply circuit provided in an embodiment of the present application;

[0045] Figure 8 A circuit diagram of a conversion circuit provided in an embodiment of the present application;

[0046] Fig. 9 A circuit diagram of a switching circuit provided in an embodiment of the present application;

[0047] Fig.10 A structural block diagram of a HUB board provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0049] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0050] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0051] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, when describing the pipeline, the "connected" and "connection" used in the present utility model have the meaning of conduction. The specific meaning needs to be understood in conjunction with the context.

[0052] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0053] With the development of display technology, its application areas are becoming more and more extensive. At the same time, the development trend of the display industry is simpler structure and more convenient installation and maintenance.

[0054] At present, the LED display screens used in some large venues are composed of many independent boxes. When the power supply in one of the boxes is damaged and has no output, the corresponding box will stop supplying power and a black screen will appear. In order to solve the above problem, two power supplies are usually set in one box in the prior art. When one power supply is damaged, the other power supply can work to ensure normal display.

[0055] For example, refer to Figure 1 Box A includes two power supplies, each of which can supply power to the display module, so that the LED display can work normally. Both power supplies can convert the 220V voltage output by the power cord into a 4.2V voltage to supply power to the display module. If one power supply fails, the other power supply will supply power to the display module, so that there will be no black screen; however, in this way, each box needs to place an extra power supply, which will increase the cost and make the box occupy a large area, which is not conducive to further promotion; at the same time, when both power supplies in the same box fail, there will still be a black screen due to power failure.

[0056] Based on this, some embodiments of the present application provide an LED display screen, such as Figure 2 As shown, the LED display screen 100 includes: a plurality of boxes 1, a power line 2, a first network cable 3 and a second network cable 4.

[0057] Each box 1 includes a power module 11 and a display module 12 .

[0058] The power module 11 includes a main power terminal 101 , a power output terminal 102 and a backup power terminal 103 .

[0059] The display module 12 includes a power supply terminal 121 .

[0060] The power output terminal 102 of the power module 11 is electrically connected to the power terminal 121 of the display module 12 ; the power line 2 is connected to the main power terminals 101 of the plurality of power modules 11 .

[0061] The power cord 2 is configured to connect the box 1 to AC power; the first network cable 3 cascades the display control cards 13 configured for each of the multiple boxes 1, and is used to transmit data signals and control signals for the display modules 12 in the multiple boxes 1; the second network cable 4 cascades the backup power supply terminals 103 of the multiple power modules 11.

[0062] The power module 11 is configured to receive alternating current through the main power terminal 101, generate a first direct current based on the alternating current, and output the first direct current to the display module 12 through the power output terminal 102; and / or generate a second direct current based on the alternating current, and transmit the second direct current to the second network cable 4 through the backup power terminal 103; or, the power module 11 is configured to receive the second direct current transmitted by the second network cable 4 through the backup power terminal 103, convert the second direct current into a third direct current, and transmit the third direct current to the display module 12 through the power output terminal 102.

[0063] The first direct current and the third direct current are direct currents that can drive the box to work.

[0064] That is to say, the power module 11 has three functions:

[0065] The first function is that the power module 11 directly converts the alternating current transmitted via the power line 2 into a first direct current, and transmits it to the display module 12 to supply power to the display module 12 .

[0066] The second function is that the power module 11 converts the AC power transmitted via the power line 2 into a first DC power, and transmits it to the display module 12 to power the display module 12. At the same time, the power module 11 also converts the AC power transmitted by the power line 2 into a second DC power, and transmits it to the second network cable 4 through the backup power supply terminal 103.

[0067] The third function is that the power module 11 receives the second direct current transmitted by the second network cable 4 through the backup power terminal 103 , converts the second direct current into a third direct current, and transmits the third direct current to the display module 12 through the power output terminal 102 .

[0068] For example, when all boxes are operating normally, the power module 11 directly converts the 220V AC power transmitted via the power line 2 into the first DC power of 4.2V, and transmits it to the display module 12 to supply power to the display module 12 .

[0069] When a fault occurs in a non-box body, the power module 11 first converts the 220V AC power into the first DC power of 4.2V, and transmits it to the display module 12 to power the display module 12. At the same time, the power module 11 also converts the 220V AC power into the second DC power of 36V, and transmits the 36V DC power to the second network cable 4 through the backup power supply terminal 103.

[0070] When a fault occurs in this box, the power module 11 receives the 36V second DC power transmitted by the second network cable 4 through the backup power supply terminal 103, converts the 36V second DC power into a 4.2V third DC power, and transmits the third DC power 4.2V to the display module 12 through the power output terminal 102.

[0071] It should be noted that the above 4.2V is the power supply voltage required by the display module. When the cabinet fails, the non-faulty cabinet supplies power to the faulty cabinet. The total input power is certain. When the cabinet fails, the total input power decreases, but the total power required by the display module that needs to be powered remains unchanged. Therefore, the 36V second DC power transmitted through the second network cable and the converted 4.2V third DC power do not meet the required 36V and 4.2V. The brightness of the display module can be reduced to reduce the power demand of the display module to ensure normal display.

[0072] The following description is based on 220V AC power, 4.2V first DC power, 36V second DC power and 4.2V third DC power as examples.

[0073] Based on the above scheme, some embodiments of the present application provide an LED display screen, which provides data signals and control signals to the display module through a first network cable, and transmits a second DC current equalization power supply through a second network cable, so that the LED display screen can operate normally regardless of whether there is a power module failure, so that the LED display screen can display normally.

[0074] like Figure 3 As shown, the power module 11 includes: a main power circuit 14 , a backup power circuit 15 and a switching circuit 16 .

[0075] The main power circuit 14 includes an input terminal 141 , a first output terminal 142 , and a second output terminal 143 .

[0076] The backup power supply circuit 15 includes a first input terminal 151 , a second input terminal 152 , a first output terminal 153 and a second output terminal 154 .

[0077] The switching circuit 16 includes a first input terminal 161 , a second input terminal 162 , and an output terminal 163 .

[0078] The input terminal 141 of the main power circuit 14 is connected to the main power terminal 101 of the power module 11 .

[0079] The input terminal 141 of the main power circuit 14 is configured to receive AC power, the first output terminal 142 of the main power circuit 14 is configured to output a first DC power, and the second output terminal 143 of the main power circuit 14 is configured to output a second DC power.

[0080] The first input terminal 151 of the backup power supply circuit 15 is connected to the second output terminal 143 of the main power supply circuit 14, the first output terminal 153 of the backup power supply circuit 15 is connected to the backup power supply terminal 103 of the power module 11, and the second input terminal 152 of the backup power supply circuit 15 is connected to the backup power supply terminal of the power module.

[0081] The first input terminal 151 of the backup power supply circuit 15 is configured to receive the second direct current, the first output terminal 153 of the backup power supply circuit 15 is configured to output the second direct current, the second input terminal 152 of the backup power supply circuit 15 is configured to receive the second direct current transmitted by the second network cable 4, and the second output terminal 154 of the backup power supply circuit 15 is configured to output the third direct current.

[0082] The first input terminal 161 of the switching circuit 16 is connected to the first output terminal 142 of the main power circuit 14, the second input terminal 162 of the switching circuit 16 is connected to the second output terminal 154 of the backup power circuit 15, and the output terminal 163 of the switching circuit 16 is electrically connected to the power output terminal 102 of the power module 11.

[0083] The switching circuit 16 is configured to transmit the first direct current to the output terminal 163 in response to the first direct current received at the first input terminal 161 , or to transmit the third direct current to the output terminal 163 in response to the third direct current received at the second input terminal 162 .

[0084] That is to say, the switching circuit has two working modes: the first is to receive the first DC power from the main power circuit 14 and transmit the first DC power to the display module 12; the second is to receive the third DC power from the backup power circuit 15 and transmit the third DC power to the display module 12.

[0085] In some embodiments, the power module 11 further includes an electromagnetic compatibility circuit 17 .

[0086] An input terminal 171 of the electromagnetic compatibility circuit 17 is electrically connected to the main power terminal 101 of the power module 11 , and an output terminal 172 of the electromagnetic compatibility circuit 17 is electrically connected to the input terminal 141 of the main power circuit 14 .

[0087] The electromagnetic compatibility circuit 17 is configured to filter, so that the electromagnetic compatibility capability of the power module 11 meets the safety requirements.

[0088] For example, when all boxes are working normally, the operation status is as follows: Figure 4 Each box is operating normally, and each box is powered by a corresponding power module 11. Since the boxes are operating normally, there is no need for a second network cable to provide current sharing. The main power circuit directly converts the AC power transmitted via the power cable 2 into the first DC power, and transmits it to the display module 12 to power the display module 12.

[0089] Among them, the dotted line in the figure represents that the circuit is not used.

[0090] When a fault occurs in a non-box, refer to Figure 5 . Figure 5The power module and display module in the box belong to this box. The power module 11 first converts the 220V AC power into the first DC power of 4.2V, and transmits it to the display module 12 to power the display module 12. At the same time, the power module 11 also converts the 220V AC power into the second DC power of 36V, and transmits the 36V DC power to the second network cable 4 through the backup power supply terminal 103.

[0091] When this box fails, refer to the operating conditions Figure 6 . Figure 6 The power module and display module in the box belong to this box. The power module 11 receives the second 36V DC power transmitted by the second network cable 4 through the backup power supply terminal 103, converts the 36V second DC power into the third 4.2V DC power, and transmits the third DC power 4.2V to the display module 12 through the power output terminal 102.

[0092] In this way, regardless of whether the cabinet fails or not, the display module of the LED display can meet the power supply needs and can work normally.

[0093] In some embodiments, Figure 7 As shown, Figure 7 This is a circuit diagram of a portion of the main power supply circuit.

[0094] The main power circuit 14 includes a first transistor Q1, a second transistor Q2, a transformer T1, a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4.

[0095] The control end of the first transistor Q1 is electrically connected to the first pulse voltage, the first end of the first transistor Q1 is electrically connected to the first power supply end, the second end of the first transistor Q1 is electrically connected to the first end of the second transistor Q2, and is also electrically connected to the first input end of the transformer T1.

[0096] The control end of the second transistor Q2 is electrically connected to the first pulse voltage, the second end of the second transistor Q2 is electrically connected to the first ground end SGND, and is also electrically connected to the second input end of the transformer T1.

[0097] An anode terminal of the first diode D1 is electrically connected to the first output terminal of the transformer T1 , and a cathode terminal of the first diode D1 is electrically connected to the first output terminal 142 of the main power circuit 14 .

[0098] The positive terminal of the second diode D2 is electrically connected to the second output terminal of the transformer T1, and the negative terminal of the second diode D2 is electrically connected to the first output terminal 142 of the main power supply circuit 14; the positive terminal of the third diode D3 is electrically connected to the third output terminal of the transformer T1, and the negative terminal of the third diode D3 is electrically connected to the second output terminal 143 of the main power supply circuit 14; the positive terminal of the fourth diode D4 is electrically connected to the fourth output terminal of the transformer T1, and the negative terminal of the fourth diode D4 is electrically connected to the second output terminal 143 of the main power supply circuit 14.

[0099] In some embodiments, the first transistor Q1 and the second transistor Q2 are both MOS transistors, the control end is the gate G of the MOS transistor, the first end is the drain D of the MOS transistor, and the second end is the source S of the MOS transistor.

[0100] Among them, PWM-H and PWM-L are control signals of the first transistor Q1 and the second transistor Q2, which can control the switching of the first transistor Q1 and the second transistor Q2.

[0101] V_BUCK is the high-voltage DC power that flows into the rectifier bridge or after PFC filtering; for example, it can be 220V DC power.

[0102] In some embodiments, the main power supply circuit 14 also includes: a first capacitor C1, a second capacitor C2 and a third capacitor C3; the first end of the first capacitor C1 is electrically connected to the first output terminal 142 of the main power supply circuit 14, and the second end of the first capacitor C1 is electrically connected to the second ground terminal GND; the first end of the second capacitor C2 is electrically connected to the second output terminal 143 of the main power supply circuit 14, and the second end of the second capacitor C2 is electrically connected to the second ground terminal GND; the first end of the third capacitor C3 is electrically connected to the second input terminal of the transformer, and the second end of the third capacitor C3 is electrically connected to the first ground terminal SGND.

[0103] In some embodiments, the first capacitor C1 and the second capacitor C2 are electrolytic capacitors, which play a filtering role. The first end of the first capacitor C1 and the second capacitor C2 is a positive electrode, and the second end of the first capacitor C1 and the second capacitor C2 is a negative electrode.

[0104] That is to say, the main power circuit can convert the voltage of 220V into the first direct current of 4.2V through the upper output part of the transformer, and the lower output part of the transformer can convert the voltage of 220V into the second direct current of 36V.

[0105] It should be noted that SGND (signal ground) has higher requirements because the signal is generally weak and easily interfered with; GND (power ground) is not very clean, so the requirements are not that high. The currents flowing through are different: the current flowing through SGND (signal ground) is smaller, and the current flowing through GND (power ground) is larger. The lines are different: SGND (signal ground) corresponds to the line through which the communication signal return between two chips or modules flows; the power ground corresponds to the line of the power loop current. SGND (signal ground) is usually the ground of the sensor. Usually SGND (signal ground) and GND (power ground) cannot be shared, because the large current flowing through GND will produce a voltage difference, causing interference, which will cause the signal to be misjudged and the high level will be judged as a low level. In the subsequent description, all ground terminals that are not specially specified are GND.

[0106] like Figure 3 to Figure 6 As shown, the backup power supply circuit 15 includes: a conversion circuit 18.

[0107] The input terminal 181 of the conversion circuit 18 is electrically connected to the second input terminal 152 of the backup power circuit 15 , and the output terminal 182 of the conversion circuit 18 is electrically connected to the second output terminal 154 of the backup power circuit 15 .

[0108] The conversion circuit 18 is configured to convert the second direct current into a third direct current; the first input terminal 151 of the backup power supply circuit is connected to the first output terminal 153 .

[0109] like Figure 8 As shown, in some embodiments, the conversion circuit 18 includes: a control chip 19, a charging circuit 20, an inductor L, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a fourth capacitor C4, and a fifth capacitor C5.

[0110] The first control terminal EN of the control chip 19 is electrically connected to the second end of the first resistor R1 , and is also electrically connected to the first end of the second resistor R2 .

[0111] The power supply terminal VCC of the control chip 19 is electrically connected to the first end of the fourth capacitor C4; the second end of the fourth capacitor C4 is electrically connected to the second end of the second resistor R2 and also to the ground terminal; the first end of the first resistor R1 is electrically connected to the input terminal 181 of the conversion circuit 18.

[0112] The second control terminal BS of the control chip 19 is electrically connected to the first terminal of the charging circuit 20; the output terminal of the control chip 19 is electrically connected to the first terminal of the inductor L, and the second terminal of the charging circuit 20 is electrically connected to the output terminal LX of the control chip 19. The second terminal of the inductor L is electrically connected to the output terminal 182 of the conversion circuit 18.

[0113] The feedback terminal FB of the control chip 19 is electrically connected to the second end of the third resistor R3, the first end of the fourth resistor R4, the first end of the fifth resistor R5 and the second end of the fifth capacitor C5; the first end of the third resistor R3 is electrically connected to the first end of the fifth capacitor C5, and is also electrically connected to the output end of the conversion circuit; the second end of the fourth resistor R4 and the second end of the fifth resistor R5 are electrically connected to the ground end.

[0114] The charging circuit 20 includes: a fourteenth resistor R14 and an eleventh capacitor C11, the first end of the fourteenth resistor R14 is electrically connected to the first end of the charging circuit 20, the second end of the fourteenth resistor R14 is electrically connected to the first end of the eleventh capacitor C11, and the second end of the eleventh capacitor C11 is electrically connected to the output end LX of the control chip 19.

[0115] In some embodiments, the power input terminal VIN of the control chip 19 is electrically connected to the second end of the fifteenth resistor R15 , and the first end of the fifteenth resistor R15 is electrically connected to the input terminal 181 of the conversion circuit 18 .

[0116] In some embodiments, the conversion circuit 18 further includes: a twelfth capacitor C12, a first end of the twelfth capacitor C12 is electrically connected to the output end 182 of the conversion circuit 18, and a second end of the twelfth capacitor C12 is electrically connected to the ground end GND. The twelfth capacitor C12 is an electrolytic capacitor, which plays a filtering role.

[0117] The function of the conversion circuit 18 is equivalent to a DC-DC circuit, which is used to convert a larger DC voltage into a smaller DC voltage.

[0118] like Figure 3 and Fig. 9 As shown, in some embodiments, the switching circuit 16 includes: a first switching circuit 21 and a second switching circuit 22 .

[0119] An input end of the first switching circuit 21 is electrically connected to a first input end 161 of the switching circuit 16 , and an output end of the first switching circuit 21 is electrically connected to a power end 121 of the display module 12 .

[0120] An input end of the second switching circuit 22 is electrically connected to the second input end 162 of the switching circuit 16 , and an output end of the second switching circuit 22 is electrically connected to the power end 121 of the display module 12 .

[0121] The first switching circuit 21 is configured to, in response to the first direct current received at the input end of the first switching circuit 21 , turn on the first switching circuit 21 to transmit the first direct current to the output end of the first switching circuit 21 .

[0122] The second switching circuit 22 is configured to, in response to the third direct current received at the input end of the second switching circuit 22 , turn on the second switching circuit 22 to transmit the third direct current to the output end of the second switching circuit 22 .

[0123] like Fig. 9 As shown, in some embodiments, the first switching circuit 21 includes: a third transistor Q3, a fourth transistor Q4, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a fifth diode D5, a sixth diode D6, a sixth capacitor C6, a seventh capacitor C7 and an eighth capacitor C8.

[0124] The control end of the third transistor Q3 is electrically connected to the second end of the sixth capacitor C6, the second end of the seventh capacitor C7, the second end of the eighth resistor R8, the first end of the seventh resistor R7 and the negative terminal of the fifth diode D5; the first end of the third transistor Q3 is electrically connected to the first input end 161 of the switching circuit 16, the first end of the sixth resistor R6 and the first end of the sixth capacitor C6; the second end of the third transistor Q3 is electrically connected to the first end of the seventh capacitor C7, the first end of the eighth resistor R8 and the power supply end of the display module.

[0125] The control end of the fourth transistor Q4 is electrically connected to the second end of the ninth resistor R9, the first end of the tenth resistor R10 and the first end of the eighth capacitor C8; the first end of the fourth transistor Q4 is electrically connected to the negative end of the sixth diode D6; the second end of the fourth transistor Q4 is electrically connected to the second end of the eighth capacitor C8, the second end of the tenth resistor R10, and the ground end. The positive end of the sixth diode D6 is electrically connected to the second end of the sixth resistor R6, the second end of the seventh resistor R7 and the positive end of the fifth diode D5.

[0126] The second switching circuit 22 includes a fifth transistor Q5 , an eleventh resistor R11 , a twelfth resistor R12 , a thirteenth resistor R13 , a seventh diode D7 , a ninth capacitor C9 and a tenth capacitor C10 .

[0127] The control end of the fifth transistor Q5 is electrically connected to the second end of the twelfth resistor R12, the first end of the thirteenth resistor R13, the negative end of the seventh diode D7, the first end of the ninth capacitor C9, and the first end of the tenth capacitor C10; the first end of the fifth transistor Q5 is electrically connected to the second input end 162 of the switching circuit 16, the second end of the eleventh resistor R11 and the second end of the ninth capacitor C9; the second end of the fifth transistor Q5 is electrically connected to the second end of the tenth capacitor C10, the second end of the thirteenth resistor R13 and the power supply end 121 of the display module 12; the positive end of the seventh diode D7 is electrically connected to the first end of the eleventh resistor R11 and the first end of the twelfth resistor R12.

[0128] In some embodiments, the third transistor Q3 , the fourth transistor Q4 , and the fifth transistor Q5 are all MOS transistors.

[0129] The control end of the third transistor Q3 is the gate G of the MOS tube, the second end of the third transistor Q3 is the drain D of the MOS tube, and the first end of the third transistor Q3 is the source S of the MOS tube.

[0130] The control end of the fourth transistor Q4 is the gate G of the MOS tube, the first end of the fourth transistor Q4 is the drain D of the MOS tube, and the second end of the fourth transistor Q4 is the source S of the MOS tube.

[0131] The control end of the fifth transistor Q5 is the gate G of the MOS tube, the second end of the fifth transistor Q5 is the drain D of the MOS tube, and the first end of the fifth transistor Q5 is the source S of the MOS tube.

[0132] That is to say, when the third transistor Q3 and the fourth transistor Q4 are turned on and the fifth transistor Q5 is turned off, the first switching circuit is turned on, and the main power supply circuit 14 supplies power to the display module 12; when the third transistor Q3 and the fourth transistor Q4 are turned off and the fifth transistor Q5 is turned on, the second switching circuit is turned on, and the backup power supply circuit 15 supplies power to the display module 12.

[0133] like Figure 2 to Figure 6 As shown, some embodiments of the present application provide a power module for an LED display screen, and the LED display screen includes: a plurality of boxes 1. The box 1 includes a power module 11 and a display module 12 connected to each other, and the power module is used to connect the box 1 to an external circuit, and the external circuit is used to provide power to the box 1.

[0134] The power module for the LED display screen includes: a main power circuit 14 , a backup power circuit 15 and a switching circuit 16 .

[0135] The main power circuit 14 includes an input terminal 141, a first output terminal 142 and a second output terminal 143. The input terminal 141 of the main power circuit 14 is connected to the power line 2, and the power line 2 is configured to connect the box 1 to AC power.

[0136] The main power supply circuit 14 is configured to receive alternating current, generate a first direct current based on the alternating current, and output the first direct current from a first output terminal, and / or generate a second direct current based on the alternating current, and output the second direct current from a second output terminal; wherein the first direct current is direct current that can drive the box 1 to work, and the box 1 includes a display control card 13 for providing data signals and control signals to the display module 12, and the display control cards 13 of each box 1 are cascaded through a first network cable 3.

[0137] The backup power supply circuit 15 includes a first input terminal 151 , a second input terminal 152 , a first output terminal 153 and a second output terminal 154 .

[0138] The first input end 151 of the backup power supply circuit 15 is connected to the second output end 143 of the main power supply circuit 14, and the first output end 153 of the backup power supply circuit 15 is used to be connected to the second input end 152 of the backup power supply circuit 15 of the power module 11 of other boxes 1 in the LED display screen through a second network cable; the second input end 152 of the backup power supply circuit 15 is used to be connected to the second output end 154 of the backup power supply circuit 15 of the power module 11 of other boxes 1 in the LED display screen through a second network cable.

[0139] The backup power supply circuit 15 is configured to receive the second direct current and transmit the second direct current to the second network cable, or to receive the second direct current transmitted by the second network cable, convert the second direct current transmitted by the second network cable into a third direct current and output it from the second output end, wherein the third direct current is direct current that can drive the box 1 to work.

[0140] The switching circuit 16 includes a first input terminal 161, a second input terminal 162 and an output terminal 163. The first input terminal 161 of the switching circuit 16 is connected to the first output terminal 142 of the main power circuit 14, the second input terminal 162 of the switching circuit 16 is connected to the second output terminal 154 of the backup power circuit 15, and the output terminal 163 of the switching circuit 16 is electrically connected to the display module 12.

[0141] The switching circuit 16 is configured to, in response to the first direct current received at the first input terminal, transmit the first direct current to the output terminal to power the display module 12, or, in response to the third direct current received at the second input terminal, transmit the third direct current to the output terminal to power the display module 12.

[0142] In summary, some embodiments of the present application provide a power module for an LED display screen, which converts voltage into a first direct current and a second direct current through a main power circuit 14, outputs the second direct current or receives the second direct current through a backup power circuit 15, and conducts the main power circuit 14 with the display module 12, or conducts the backup power circuit 15 with the display module 12, through a switching circuit 16. Thus, the LED display screen can always work normally.

[0143] like Figure 2 and Fig.10 As shown, some embodiments of the present application also provide a HUB board for an LED display screen. Fig.10 The HUB board 200 is used for the box 1 in the LED display screen, and the box 1 includes a display module 12.

[0144] The HUB board 200 includes: the power module 11 mentioned above; and a display control card 13 .

[0145] The display control card 13 is used to provide data signals and control signals to the display module. The display control cards 13 of each cabinet 1 are cascaded via the first network cable 3 .

[0146] The beneficial effects of the HUB board used for the LED display are the same as the beneficial effects of the LED display board described above, and will not be described in detail here.

[0147] It should be noted that the HUB board refers to a hub. A hub is a network device that is mainly used to connect multiple Ethernet twisted pair cables or optical fiber collections to the same physical medium to achieve connections between multiple computers or network devices. It works at the physical layer of the OSI model. Its main function is to regenerate, shape and amplify the received signal to expand the transmission distance of the network and concentrate all nodes on the node centered on it. The hub itself does not have intelligent memory and learning capabilities. When sending data, it uses broadcasting instead of directly sending data to the destination node. In addition, hubs can be divided into passive HUBs, active HUBs, and intelligent HUBs. The application scenarios of hubs include connecting multiple computers or network devices in a network using a star topology. Its existence ensures that when a line in the network fails, it will not affect the work of other lines.

[0148] The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An LED display screen, characterized in that: include: A plurality of boxes, each of which comprises a power module and a display module, and a power output terminal of the power module is electrically connected to a power terminal of the display module; A power cord, the power cord is connected to the main power supply terminals of the plurality of power modules, and the power cord is configured to connect the box to an alternating current; A first network cable, cascading the display control cards respectively configured in the plurality of boxes, is used to transmit data signals and control signals for the display modules in the plurality of boxes; A second network cable, cascading the backup power supply ends of the multiple power modules; The power module is configured to receive the alternating current through the main power terminal, generate a first direct current according to the alternating current, and output the first direct current to the display module through the power output terminal; and / or, generating a second direct current according to the alternating current, and transmitting the second direct current to the second network cable through the backup power supply end; Alternatively, the power module is configured to receive the second direct current transmitted by the second network cable through the backup power supply end, convert the second direct current into a third direct current, and transmit the third direct current to the display module through the power output end; The first direct current and the third direct current are direct currents capable of driving the box to work.

2. The LED display screen according to claim 1, characterized in that: The power module comprises: a main power circuit, comprising an input terminal, a first output terminal, and a second output terminal; the input terminal of the main power circuit is connected to the main power terminal of the power module, the input terminal of the main power circuit is configured to receive the alternating current, the first output terminal of the main power circuit is configured to output the first direct current, and the second output terminal of the main power circuit is configured to output the second direct current; a backup power supply circuit, comprising a first input terminal, a second input terminal, a first output terminal, and a second output terminal: the first input terminal of the backup power supply circuit is connected to the second output terminal of the main power supply circuit, the first output terminal of the backup power supply circuit is connected to the backup power supply terminal of the power supply module, and the second input terminal of the backup power supply circuit is connected to the backup power supply terminal of the power supply module; the first input terminal of the backup power supply circuit is configured to receive the second direct current, the first output terminal of the backup power supply circuit is configured to output the second direct current, the second input terminal of the backup power supply circuit is configured to receive the second direct current transmitted by the second network cable, and the second output terminal of the backup power supply circuit is configured to output the third direct current; and A switching circuit comprises a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the switching circuit is connected to the first output terminal of the main power supply circuit, the second input terminal of the switching circuit is connected to the second output terminal of the backup power supply circuit, and the output terminal of the switching circuit is electrically connected to the power output terminal of the power supply module; the switching circuit is configured to transmit the first direct current to the output terminal in response to the first direct current received at the first input terminal, or to transmit the third direct current to the output terminal in response to the third direct current received at the second input terminal.

3. The LED display screen according to claim 2, characterized in that: The main power supply circuit includes: a first transistor, a second transistor, a transformer, a first diode, a second diode, a third diode and a fourth diode; The control terminal of the first transistor is electrically connected to the first pulse voltage, the first terminal of the first transistor is electrically connected to the first power supply terminal, the second terminal of the first transistor is electrically connected to the first terminal of the second transistor, and is also electrically connected to the first input terminal of the transformer; The control terminal of the second transistor is electrically connected to the first pulse voltage, the second terminal of the second transistor is electrically connected to the first ground terminal, and is also electrically connected to the second input terminal of the transformer; The positive terminal of the first diode is electrically connected to the first output terminal of the transformer, and the negative terminal of the first diode is electrically connected to the first output terminal of the main power circuit; the positive terminal of the second diode is electrically connected to the second output terminal of the transformer, and the negative terminal of the second diode is electrically connected to the first output terminal of the main power circuit; The positive terminal of the third diode is electrically connected to the third output terminal of the transformer, and the negative terminal of the third diode is electrically connected to the second output terminal of the main power supply circuit; the positive terminal of the fourth diode is electrically connected to the fourth output terminal of the transformer, and the negative terminal of the fourth diode is electrically connected to the second output terminal of the main power supply circuit.

4. The LED display screen according to claim 3, characterized in that: The main power supply circuit also includes: a first capacitor, a second capacitor and a third capacitor; A first end of the first capacitor is electrically connected to a first output end of the main power supply circuit, and a second end of the first capacitor is electrically connected to a second ground end; A first end of the second capacitor is electrically connected to a second output end of the main power supply circuit, and a second end of the second capacitor is electrically connected to a second ground end; A first end of the third capacitor is electrically connected to the second input end of the transformer, and a second end of the third capacitor is electrically connected to the first ground end.

5. The LED display screen according to any one of claims 2 to 4, characterized in that: The backup power supply circuit comprises: a conversion circuit; The input end of the conversion circuit is electrically connected to the second input end of the backup power supply circuit, and the output end of the conversion circuit is electrically connected to the second output end of the backup power supply circuit; the conversion circuit is configured to convert the second direct current into the third direct current; The first input end of the backup power supply circuit is connected to the first output end.

6. The LED display screen according to claim 5, characterized in that: The conversion circuit includes: a control chip, a charging circuit, an inductor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a fourth capacitor, and a fifth capacitor; The first control terminal of the control chip is electrically connected to the second end of the first resistor, and is also electrically connected to the first end of the second resistor; the power supply terminal of the control chip is electrically connected to the first end of the fourth capacitor; the second end of the fourth capacitor is electrically connected to the second end of the second resistor, and is also electrically connected to the ground terminal; the first end of the first resistor is electrically connected to the input end of the conversion circuit; The second control terminal of the control chip is electrically connected to the first terminal of the charging circuit; the output terminal of the control chip is electrically connected to the first terminal of the inductor, the second terminal of the charging circuit is electrically connected to the output terminal of the control chip; the second terminal of the inductor is electrically connected to the output terminal of the conversion circuit; The feedback end of the control chip is electrically connected to the second end of the third resistor, the first end of the fourth resistor, the first end of the fifth resistor and the second end of the fifth capacitor; the first end of the third resistor is electrically connected to the first end of the fifth capacitor, and is also electrically connected to the output end of the conversion circuit; the second end of the fourth resistor and the second end of the fifth resistor are electrically connected to the ground end.

7. The LED display screen according to claim 5, characterized in that: The switching circuit comprises: a first switching circuit and a second switching circuit; The input end of the first switching circuit is electrically connected to the first input end of the switching circuit, and the output end of the first switching circuit is electrically connected to the power end of the display module; The input end of the second switching circuit is electrically connected to the second input end of the switching circuit, and the output end of the second switching circuit is electrically connected to the power end of the display module; The first switching circuit is configured to, in response to a first direct current received at an input end of the first switching circuit, be turned on to transmit the first direct current to an output end of the first switching circuit; the second switching circuit is configured to, in response to a third direct current received at an input end of the second switching circuit, be turned on to transmit the third direct current to an output end of the second switching circuit.

8. The LED display screen according to claim 7, characterized in that: The first switching circuit includes: a third transistor, a fourth transistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a fifth diode, a sixth diode, a sixth capacitor, a seventh capacitor and an eighth capacitor; The control end of the third transistor is electrically connected to the second end of the sixth capacitor, the second end of the seventh capacitor, the second end of the eighth resistor, the first end of the seventh resistor and the negative end of the fifth diode; the first end of the third transistor is electrically connected to the first input end of the switching circuit, the first end of the sixth resistor and the first end of the sixth capacitor; the second end of the third transistor is electrically connected to the first end of the seventh capacitor, the first end of the eighth resistor and the power supply end of the display module; The control end of the fourth transistor is electrically connected to the second end of the ninth resistor, the first end of the tenth resistor and the first end of the eighth capacitor; the first end of the fourth transistor is electrically connected to the negative terminal of the sixth diode; the second end of the fourth transistor is electrically connected to the second end of the eighth capacitor, the second end of the tenth resistor, and the ground terminal; The positive terminal of the sixth diode is electrically connected to the second end of the sixth resistor, the second end of the seventh resistor and the positive terminal of the fifth diode; The second switching circuit includes: a fifth transistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a seventh diode, a ninth capacitor and a tenth capacitor; The control end of the fifth transistor is electrically connected to the second end of the twelfth resistor, the first end of the thirteenth resistor, the negative terminal of the seventh diode, the first end of the ninth capacitor, and the first end of the tenth capacitor; The first end of the fifth transistor is electrically connected to the second input end of the switching circuit, the second end of the eleventh resistor and the second end of the ninth capacitor; The second end of the fifth transistor is electrically connected to the second end of the tenth capacitor, the second end of the thirteenth resistor and the power supply end of the display module; An anode terminal of the seventh diode is electrically connected to a first end of the eleventh resistor and a first end of the twelfth resistor.

9. The LED display screen according to claim 2, characterized in that: The power module also includes an electromagnetic compatibility circuit; The input end of the electromagnetic compatibility circuit is electrically connected to the main power end of the power module, and the output end of the electromagnetic compatibility circuit is electrically connected to the input end of the main power circuit.

10. A power module for an LED display screen, characterized in that: The LED display screen comprises: A plurality of boxes, each box comprising the power supply module and the display module connected to each other, the power supply module being used to connect the box to an external circuit, and the external circuit being used to provide power to the box; the power supply module for the LED display screen comprises: A main power supply circuit, comprising an input end, a first output end, and a second output end, wherein the input end of the main power supply circuit is connected to a power line, wherein the power line is configured to connect the box to an alternating current, and the main power supply circuit is configured to receive the alternating current, generate a first direct current according to the alternating current, and output the first direct current from the first output end, and / or generate a second direct current according to the alternating current, and output the second direct current from the second output end; wherein the first direct current is direct current capable of driving the box to work, and the box comprises a display control card for providing a data signal and a control signal to a display module, and the display control cards of each box are cascaded via a first network cable; A backup power supply circuit, comprising a first input end, a second input end, a first output end, and a second output end, wherein the first input end of the backup power supply circuit is connected to the second output end of the main power supply circuit, and the first output end of the backup power supply circuit is used to connect to the second input end of the backup power supply circuit of the power supply module of the other boxes in the LED display screen through the second network cable; the second input end of the backup power supply circuit is used to connect to the second output end of the backup power supply circuit of the power supply module of the other boxes in the LED display screen through the second network cable; the backup power supply circuit is configured to receive the second direct current and transmit the second direct current to the second network cable, or receive the second direct current transmitted by the second network cable, convert the second direct current transmitted by the second network cable into a third direct current and output it from the second output end, wherein the third direct current is a direct current capable of driving the box to work; A switching circuit comprises a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the switching circuit is connected to the first output terminal of the main power supply circuit, the second input terminal of the switching circuit is connected to the second output terminal of the backup power supply circuit, and the output terminal of the switching circuit is electrically connected to the display module; the switching circuit is configured to, in response to a first direct current received at the first input terminal, transmit the first direct current to the output terminal to power the display module, or, in response to a third direct current received at the second input terminal, transmit the third direct current to the output terminal to power the display module.

11. The power module for LED display screen according to claim 10, characterized in that: The main power supply circuit includes a first transistor, a second transistor, a transformer, a first diode, a second diode, a third diode, a fourth diode, a first capacitor, a second capacitor and a third capacitor; The control terminal of the first transistor is electrically connected to the first pulse voltage, the first terminal of the first transistor is electrically connected to the first power supply terminal, the second terminal of the first transistor is electrically connected to the first terminal of the second transistor, and is also electrically connected to the first input terminal of the transformer; The control terminal of the second transistor is electrically connected to the first pulse voltage, the second terminal of the second transistor is electrically connected to the first ground terminal, and is also electrically connected to the second input terminal of the transformer; The positive terminal of the first diode is electrically connected to the first output terminal of the transformer, and the negative terminal of the first diode is electrically connected to the first output terminal of the main power circuit; the positive terminal of the second diode is electrically connected to the second output terminal of the transformer, and the negative terminal of the second diode is electrically connected to the first output terminal of the main power circuit; The positive terminal of the third diode is electrically connected to the third output terminal of the transformer, and the negative terminal of the third diode is electrically connected to the second output terminal of the main power circuit; the positive terminal of the fourth diode is electrically connected to the fourth output terminal of the transformer, and the negative terminal of the fourth diode is electrically connected to the second output terminal of the main power circuit; A first end of the first capacitor is electrically connected to a second output end of the main power supply circuit, and a second end of the first capacitor is electrically connected to a second ground end; A first end of the second capacitor is electrically connected to the first output end of the main power supply circuit, and a second end of the second capacitor is electrically connected to the second ground end; A first end of the third capacitor is electrically connected to the second input end of the transformer, and a second end of the third capacitor is electrically connected to the first ground end.

12. The power module for LED display screen according to claim 10, characterized in that: The backup power supply circuit includes a conversion circuit; The conversion circuit includes: a control chip, a charging circuit, an inductor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a fourth capacitor, and a fifth capacitor; The first control terminal of the control chip is electrically connected to the second end of the first resistor, and is also electrically connected to the first end of the second resistor; the power supply terminal of the control chip is electrically connected to the first end of the fourth capacitor; the second end of the fourth capacitor is electrically connected to the second end of the second resistor, and is also electrically connected to the ground terminal; the first end of the first resistor is electrically connected to the input end of the conversion circuit; The second control terminal of the control chip is electrically connected to the first terminal of the charging circuit; the output terminal of the control chip is electrically connected to the first terminal of the inductor, the second terminal of the charging circuit is electrically connected to the output terminal of the control chip; the second terminal of the inductor is electrically connected to the output terminal of the conversion circuit; The feedback end of the control chip is electrically connected to the second end of the third resistor, the first end of the fourth resistor, the first end of the fifth resistor and the second end of the fifth capacitor; the first end of the third resistor is electrically connected to the first end of the fifth capacitor, and is also electrically connected to the output end of the conversion circuit; the second end of the fourth resistor and the second end of the fifth resistor are electrically connected to the ground end.

13. The power module for LED display screen according to claim 10, characterized in that: The switching circuit includes: a third transistor, a fourth transistor, a fifth transistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fifth diode, a sixth diode, a seventh diode, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor and a tenth capacitor; The control end of the third transistor is electrically connected to the second end of the sixth capacitor, the second end of the seventh capacitor, the second end of the eighth resistor, the first end of the seventh resistor and the negative end of the fifth diode; the first end of the third transistor is electrically connected to the first input end of the switching circuit, the first end of the sixth resistor and the first end of the sixth capacitor; the second end of the third transistor is electrically connected to the first end of the seventh capacitor, the first end of the eighth resistor and the power supply end of the display module; The control end of the fourth transistor is electrically connected to the second end of the ninth resistor, the first end of the tenth resistor and the first end of the eighth capacitor; the first end of the fourth transistor is electrically connected to the negative terminal of the sixth diode; the second end of the fourth transistor is electrically connected to the second end of the eighth capacitor, the second end of the tenth resistor, and the ground terminal; The positive terminal of the sixth diode is electrically connected to the second end of the sixth resistor, the second end of the seventh resistor and the positive terminal of the fifth diode; The control end of the fifth transistor is electrically connected to the second end of the twelfth resistor, the first end of the thirteenth resistor, the negative terminal of the seventh diode, the first end of the ninth capacitor, and the first end of the tenth capacitor; The first end of the fifth transistor is electrically connected to the second input end of the switching circuit, the second end of the eleventh resistor and the second end of the ninth capacitor; The second end of the fifth transistor is electrically connected to the second end of the tenth capacitor, the second end of the thirteenth resistor and the power supply end of the display module; An anode terminal of the seventh diode is electrically connected to a first end of the eleventh resistor and a first end of the twelfth resistor.

14. A HUB board for an LED display screen, characterized in that: The box used in the LED display screen includes a display module, and the HUB board includes: The power module according to any one of claims 10 to 13; and A display control card is used to provide data signals and control signals to the display module. The display control cards of each box are cascaded via a first network cable.

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