LED display screen power supply box and LED display screen

Abstract

The embodiment of the invention provides an LED display screen power supply box and an LED display screen. The LED display screen power supply box comprises a power supply box body and a power supply box cover. An adapter plate is arranged in the power supply box body, and a power supply terminal, at least one first plug-in module, at least one first switch module and a receiving card are mounted on the adapter plate; the first plugging module comprises a first plugging piece and a second plugging piece; the power supply box cover is provided with at least one first voltage conversion module and at least one second plug-in module, and the second plug-in module comprises a third plug-in piece and a fourth plug-in piece; after the power supply box cover covers the power supply box body, the third plug connector is matched with the first plug connector in a plug-in mode, the fourth plug connector is matched with the second plug connector in a plug-in mode, the first switch module detects a level signal of a direct-current power supply, the first switch module is connected, an external power supply is connected with the receiving card, power is supplied to the LED display screen, the structure is simple, operation is convenient, and practicability is high. The cost is low.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of LED display screens, and in particular to an LED display screen power box and an LED display screen. Background Art

[0002] With the development of LED display technology, the requirements for the installation and simplicity of the structure of LED display are getting higher and higher. LED display is generally assembled from multiple LED display modules, and multiple LED display modules are powered by a power supply set in a power box.

[0003] In the existing LED display screen, the power supply in the power box is connected to the LED display module by a large number of wires. The connection through wires is inconvenient to install and disassemble due to the small space of the power box, and the types and quantities of wires are large, which is costly. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present application provides a power box for an LED display screen, which has a simple structure, is easy to operate and has low cost.

[0005] According to a first aspect of an embodiment of the present application, there is provided a power supply box for an LED display screen, comprising a power supply box body and a power supply box cover;

[0006] An adapter board is provided in the power box body, and a power terminal, at least one first plug-in module, at least one first switch module and a receiving card are installed on the adapter board; the first plug-in module includes a first plug-in component and a second plug-in component; the second plug-in component includes a plurality of groups of first pins, and the first switch module includes a plurality of groups of first terminals, an input terminal and an output terminal;

[0007] The first end of the power terminal is connected to the external power supply, the second end of the power terminal is connected to the input end of the first switch module, each group of first terminals of the first switch module is respectively connected to a group of first pins of the second connector, each group of first terminals of the first switch module is also connected to a DC power supply, and the output end of the first switch module is connected to the first connector; the second connector is connected to one end of the receiving card, and the other end of the receiving card is connected to the LED display screen;

[0008] At least one first voltage conversion module and at least one second plug-in module are installed on the power box cover, and the second plug-in module includes a third plug-in component and a fourth plug-in component; the input end of the first voltage conversion module is connected to the third plug-in component, and the output end of the first voltage conversion module is connected to the fourth plug-in component;

[0009] When the power box cover is closed on the power box body, the first switch module detects the level signal of the DC power supply through the third connector plugging into the first connector and the fourth connector plugging into the second connector, the first switch module is connected, the second end of the power terminal is connected to the first connector through the first switch module, and the external power supply is connected to the receiving card to power the LED display.

[0010] According to a second aspect of the embodiment of the present application, there is provided an LED display screen, comprising an LED box and a plurality of LED light panels, wherein the LED box comprises the above-mentioned LED display screen power supply box;

[0011] When several LED light panels are installed on the LED box, each LED light panel is connected to the receiving card in the LED display power box.

[0012] In the embodiment of the present application, when the power box cover is closed on the power box body, the first switch module detects the level signal of the DC power supply through the third plug-in connector and the first plug-in connector, and the fourth plug-in connector and the second plug-in connector. The first switch module is connected, the second end of the power terminal is connected to the first connector through the first switch module, and the strong voltage signal provided by the external power supply is input from the power terminal, and flows through the first connector, the third connector, the first voltage conversion module, the fourth connector, the second connector and the receiving card respectively, so as to realize the electrical connection between the external power supply and the receiving card, and power the LED display screen; when the power box cover is separated from the power box body, the first switch module cannot detect the level signal of the DC power supply, the first switch module is not connected, the strong voltage signal provided by the external power supply is input from the power terminal, the power terminal and the first connector are not conductive, the electrical connection between the external power supply and the receiving card is disconnected, and the LED display screen is not powered, which is convenient for operation, and no large amount of wire connection is required, thereby reducing costs. In addition, the power box body is independent of the power box cover and can be disassembled independently, which is convenient for subsequent maintenance.

[0013] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application.

[0014] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a LED display screen power box according to an embodiment of the present application;

[0016] Figure 2 This is a schematic diagram of the circuit structure of the first switch module in the LED display screen power box according to one embodiment of the present application;

[0017] Figure 3This is a schematic diagram of the structure of an LED display screen shown in one embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0019] It should be clear that the described embodiments are only the first part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0021] In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. The singular forms of "a", "said", and "the" used in the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. The words "if" / "if" used herein can be interpreted as "at the time of" or "when" or "in response to determination". In addition, in the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0022] The inventor discovered during the process of implementing the present application that in the existing LED display screen, the power supply in the power box and the LED display module are connected by a large number of wires. The connection by wires is inconvenient for installation and disassembly due to the small space of the power box, and the types and quantities of wires are large, resulting in high costs.

[0023] To this end, the present application sets the power supply in the power box and the power box body independently, and the two can be connected by a plug-in connector without the need for wire connection, which is convenient for operation and reduces costs. In addition, the power supply and the power box body can be disassembled independently, which is convenient for subsequent maintenance.

[0024] See also Figure 1, which is a schematic diagram of the structure of the LED display screen power supply box shown in the embodiment of the present application. The LED display screen power supply box provided in the embodiment of the present application includes a power supply box body 1 and a power supply box cover 2;

[0025] An adapter board is provided in the power box body 1, on which power terminals, at least one first plug-in module, at least one first switch module and a receiving card are installed; the first plug-in module includes a first plug-in component 11 and a second plug-in component 12; the second plug-in component 12 includes a plurality of groups of first pins, and the first switch module includes a plurality of groups of first terminals, an input terminal and an output terminal;

[0026] The first end of the power terminal is connected to the external power supply, the second end of the power terminal is connected to the input end of the first switch module, each group of first terminals of the first switch module is respectively connected to a group of first pins of the second connector 12, each group of first terminals of the first switch module is also connected to a DC power supply, and the output end of the first switch module is connected to the first connector 11; the second connector 12 is connected to one end of the receiving card, and the other end of the receiving card is connected to the LED display screen;

[0027] At least one first voltage conversion module and at least one second plug-in module are installed on the power box cover, and the second plug-in module includes a third plug-in component and a fourth plug-in component; the input end of the first voltage conversion module is connected to the third plug-in component, and the output end of the first voltage conversion module is connected to the fourth plug-in component;

[0028] When the power box cover is closed on the power box body 1, the third connector is plugged into the first connector 11, and the fourth connector is plugged into the second connector 12. The first switch module detects the level signal of the DC power supply, the first switch module is connected, and the second end of the power terminal is connected to the first connector 11 through the first switch module, connecting the external power supply to the receiving card to power the LED display.

[0029] Among them, the adapter board is a HUB board, which integrates multiple functions such as power supply, signal control, signal distribution, drive circuit, control and management. In the LED display screen, the HUB board is responsible for connecting and managing a large number of LED light boards to ensure that the entire display screen can work normally according to the predetermined display effect.

[0030] Among them, the power terminal is a splitter, which can be connected to various electronic devices, circuit modules, etc. installed on the adapter board.

[0031] The receiving card is used to drive each LED display module on the LED display screen to display data.

[0032] The external power supply is a main power supply, which is used to increase the voltage of the strong power signal. Specifically, the voltage of the strong power signal is 100V to 240V.

[0033] The number of the first plug-in modules may be one or more, and each first plug-in module includes a first plug-in component 11 and a second plug-in component 12. The number of the first switch modules may be one or more, and each first switch module includes a plurality of first connection terminals, input terminals, and output terminals. Each first plug-in module corresponds to a first switch module.

[0034] The first switch module is connected between the power terminal and the first connector 11 , and is used to control the conduction and disconnection between the power terminal and the first connector 11 .

[0035] Each group of first pins in the second connector 12 includes two first pins arranged opposite to each other, and each group of first terminals in the first switch module includes two first terminals arranged opposite to each other. The number of groups of first terminals is less than or equal to the number of groups of first pins. For example, the number of groups of first pins is 10, and the number of groups of first terminals is 2.

[0036] The first voltage conversion module is used to convert a strong voltage signal into a weak voltage signal. Specifically, the first voltage conversion module includes but is not limited to a transformer, a voltage stabilizer, and a resistor voltage divider circuit.

[0037] The number of the first voltage conversion modules may be one or more, and the number of the second plug-in modules may be one or more. Each second plug-in module includes a third plug-in component 21 and a fourth plug-in component 22. Each second plug-in module corresponds to a first voltage conversion module and a first plug-in module.

[0038] The first connector 11 is plugged with the third connector 21. Specifically, the first connector 11 can be a plug spring, and the third connector 21 can be a spring leaf. The first connector 11 can also be a spring leaf, and the third connector 21 can be a plug spring. Using the plug spring and the spring leaf as connectors has a simple structure and low cost.

[0039] The second connector 12 is plugged into the fourth connector 22. Specifically, the second connector 12 may be a female connector, and the third connector 21 may be a male connector. The second connector 12 may also be a male connector, and the fourth connector 22 may be a female connector. Using the male connector and the female connector as connectors can ensure good contact between the two, avoiding problems such as poor contact or interruption of signal / power transmission.

[0040] In the embodiment of the present application, the two first terminals opposite to each other in each group of first terminals in the first switch module are not connected, the DC power supply is connected to one of the first terminals, and the level signal of the DC power supply cannot reach the other first terminal. The two first terminals opposite to each other in each group of first terminals in the first switch module are respectively connected to the two first pins opposite to each other in the second connector 12. After the fourth connector 22 is plugged into the second connector 12, the two first pins opposite to each other in the second connector 12 are connected, so that the two first terminals opposite to each group of first terminals in the first switch module are connected. The first switch module detects the level signal of the DC power supply, the first switch module is connected, the second end of the power terminal is connected to the first connector 11 through the first switch module, and the strong voltage signal provided by the external power supply is input from the power terminal, and flows through the first connector 11, the third connector 21, the first voltage conversion module, the fourth connector 22, the second connector 12 and the receiving card, respectively, to realize the electrical connection between the external power supply and the receiving card, and to power the LED display.

[0041] By applying the embodiment of the present application, when the power box cover is closed on the power box body 1, the first switch module detects the level signal of the DC power supply through the third connector 21 and the first connector 11, and the fourth connector 22 and the second connector 12. The first switch module is connected, the second end of the power terminal is connected to the first connector through the first switch module, and the strong voltage signal provided by the external power supply is input from the power terminal, and flows through the first connector 11, the third connector 21, the first voltage conversion module, the fourth connector 22, the second connector 12 and the receiving card respectively, so as to realize the electrical connection between the external power supply and the receiving card, and power the LED display screen; when the power box cover is separated from the power box body 1, the first switch module cannot detect the level signal of the DC power supply, the first switch module is not connected, the strong voltage signal provided by the external power supply is input from the power terminal, the power terminal and the first connector are not conductive, the electrical connection between the external power supply and the receiving card is disconnected, and the LED display screen is not powered, which is convenient to operate, no longer requires a large number of wire connections, and reduces costs. Furthermore, the power box body 1 is independent of the power box cover 2 and can be disassembled independently to facilitate subsequent maintenance.

[0042] In an optional embodiment, during the process of closing the power box cover 2 on the power box body 1, when a preset number of groups of first pins in the second connector 12 are all connected to a corresponding group of pins in the fourth connector 22, the first switch module detects the level signal of the DC power supply, the first switch module is connected, and the second end of the power terminal is connected to the first connector 11 via the first switch module.

[0043] In the embodiment of the present application, it is considered that the user may touch the adapter board when closing the power box cover 2 on the power box body 1. If the adapter board is charged, the user may be in danger of electric shock. Therefore, it is necessary to ensure that the adapter board is not charged when the user closes the power box cover 2 on the power box body 1, and the adapter board is charged only after the power box cover 2 is completely closed on the power box body 1.

[0044] Specifically, when the power box cover 2 is closed on the power box body 1, if there are no preset number of groups of first pins in the second connector 12 that are plugged into a corresponding group of pins in the fourth connector 22, there are no preset number of groups of first terminals in the first switch module that are connected, the first switch module is not connected, the second end of the power terminal is not connected to the first connector 11, the external power supply is not electrically connected to the receiving card, so that the adapter board is not powered and the user has no risk of electric shock.

[0045] If there are a preset number of groups of first pins in the second connector 12, all of which are plugged into a corresponding group of pins in the fourth connector 22, there are a preset number of groups of first terminals in the first switch module that are connected, the first switch module is connected, the second end of the power terminal is connected to the first connector 11 via the first switch module, and the high-voltage signal provided by the external power supply is input from the power terminal, and flows through the first connector 11, the third connector 21, the first voltage conversion module, the fourth connector 22, the second connector 12 and the receiving card respectively, thereby realizing the electrical connection between the external power supply and the receiving card, so that the adapter board is energized. At this time, the power box cover 2 and the power box body 1 are already covered or nearly covered, and the user cannot touch the adapter board, thereby avoiding the risk of electric shock.

[0046] The first switch module detects whether each group of first pins in the second connector 12 is connected with a corresponding group of pins in the fourth connector 22 to switch between the disconnected state and the connected state. When a preset number of groups of pins are not connected between the second connector 12 and the fourth connector 22, the first switch module is in the disconnected state, the second end of the power terminal is not connected to the first connector 11, and the external power supply is not electrically connected to the receiving card, so that the adapter board is not powered, thereby preventing the user from being electrocuted.

[0047] In an optional embodiment, the power box body 1 and the power box cover 2 are connected by a hinge;

[0048] When the first pins of the target group in the second connector 12 are connected to a corresponding group of pins in the fourth connector 22, the first switch module detects the level signal of the DC power supply, the first switch module is connected, and the second end of the power terminal is connected to the first connector 11 via the first switch module; wherein, the first pins of the target group are the last group of first pins in the second connector 12 arranged in order away from the hinge.

[0049] The target group of first pins may be the last group of first pins in the second connector 12 that are sequentially arranged in the order of being away from the hinge.

[0050] In the embodiment of the present application, considering that when the power box cover 2 is closed on the power box body 1, the groups of first pins close to the hinge in the second connector 12 first contact with the corresponding group of pins in the fourth connector 22, and the groups of first pins away from the hinge contact with the corresponding group of pins in the fourth connector 22 later. Therefore, in order to ensure that the user avoids the risk of electric shock, when the target group of first pins in the second connector 12 is not connected with the corresponding group of pins in the fourth connector 22, the first switch module is not connected, the adapter board is not energized, and the user has no risk of electric shock.

[0051] When the first pin of the target group in the second connector 12 is plugged into the corresponding pin group in the fourth connector 22, the first switch module is connected and the adapter board is energized. At this time, the power box cover 2 and the power box body 1 are completely covered, and the user cannot touch the adapter board, thereby avoiding the risk of electric shock to the user.

[0052] The first switch module detects whether the first pin of the target group in the second connector 12 is plugged into a corresponding group of pins in the fourth connector 22 to switch between the disconnected state and the connected state. When the first pin of the target group in the second connector 12 is not plugged into the fourth connector 22, the first switch module is in the disconnected state, the second end of the power terminal is not connected to the first connector 11, and the external power supply is not electrically connected to the receiving card, so that the adapter board is not powered, thereby avoiding the risk of electric shock to the user.

[0053] Optionally, the first switch module may be in the on state when the first switch module detects that the first pins of the target group of first pins in the second connector 12 are plugged into a corresponding group of pins in the fourth connector 22. Alternatively, the first switch module may be in the on state when the first switch module detects that the first pins of the target group of first pins in the second connector 12 are plugged into the corresponding groups of pins in the fourth connector 22.

[0054] In an optional embodiment, the first connector 11 is disposed on a side of the adapter plate close to the hinge, and the second connector 12 is disposed on a side of the adapter plate away from the hinge.

[0055] The third connector 21 is opposite to the first connector 11 and is disposed on a side of the power box cover 2 close to the hinge. The fourth connector 22 is opposite to the second connector 12 and is disposed on a side of the power box cover 2 away from the hinge.

[0056] In the embodiment of the present application, the first connector 11 is located close to the hinge, while the second connector 12 is located far from the hinge. When the power box cover 2 is closed on the power box body 1, the first connector 11 is first connected to the third connector 21 to achieve the transmission of the strong voltage signal, and the second connector 12 is then connected to the fourth connector 22 to achieve the transmission of the weak voltage signal. When the power box cover 2 is separated from the power box body 1, the second connector 12 is first disconnected from the fourth connector 22 to disconnect the weak voltage signal, and the first connector 11 is then disconnected from the third connector 21 to disconnect the strong voltage signal.

[0057] The embodiment of the present application arranges the first connector 11 on the side of the adapter plate close to the hinge and the second connector 12 on the side of the adapter plate away from the hinge. This allows the strong current to be connected first and then the weak current to be connected when the cover and the power box cover 2 are closed. When the power box cover 2 is opened, the weak current is disconnected first and then the strong current. This improves the safety of the circuit and avoids the generation of electric sparks.

[0058] In an alternative embodiment, see Figure 2 , the first switch module includes a logic gate circuit 41, a delay circuit 42 and a detection switch 43;

[0059] The input end of the logic gate circuit 41 is the first connection terminal of each group of the first switch module, the first output end of the logic gate circuit 41 is connected to the first input end of the delay circuit 42, and the second output end of the logic gate circuit 41 is connected to the second input end of the delay circuit 42; the output end of the delay circuit 42 is connected to the first input end of the detection switch 43; the second input end of the detection switch 43 is the input end of the switch module, the third input end of the detection switch 43 is connected to the DC power supply, and the output end of the detection switch 43 is the output end of the switch module.

[0060] The logic gate circuit 41 is used to perform logic operations according to input signals, including but not limited to an AND gate, an OR gate, a NOT gate, and a NAND gate circuit.

[0061] The delay circuit 42 is used to delay the electrical signal, including but not limited to an RC delay circuit, an operational amplifier delay circuit and a transistor delay circuit.

[0062] The detection switch 43 is used to switch between disconnection and conduction according to an input signal.

[0063] In the embodiment of the present application, each group of first wiring terminals of the first switch module includes two first wiring terminals arranged opposite to each other, one of which is connected to the input terminal of the logic gate circuit 41, and the other is connected to the DC power supply. The two first wiring terminals arranged opposite to each other included in each group of first wiring terminals are not connected.

[0064] During the process of closing the power box cover 2 on the power box body 1, when a group of second pins in the first connector 11 is plugged into a corresponding group of pins in the third connector 21, two second pins in the group of second pins are connected, and two oppositely arranged first terminals included in a group of first terminals corresponding to the group of second pins are connected, and the DC power supply provides voltage for the logic gate circuit 41. By designing the specific structure of the logic gate circuit 41, the logic gate circuit 41 can output the corresponding logic operation result, and the logic operation result will reach the detection switch 43 through the delay circuit 42, thereby controlling the detection switch 43 to be in the on state and the off state.

[0065] In the embodiment of the present application, through the cooperation of the logic gate circuit 41, the delay circuit 42 and the detection switch 43, when at least one group of pins of the second connector 12 and the fourth connector 22 are not plugged in, the first switch module is in a disconnected state, the power terminal is not conductive with the first connector 11, and the external power supply is not electrically connected to the receiving card, so that the receiving card is not powered on, thereby preventing the user from being electrocuted.

[0066] In an optional embodiment, the logic gate circuit includes a first NAND gate and a second NAND gate;

[0067] The first input terminal, the second input terminal and the third input terminal of the first NAND gate are input terminals of the logic gate circuit, the output terminal of the first NAND gate is the first output terminal of the logic gate circuit, and is connected to the first input terminal, the second input terminal and the third input terminal of the second NAND gate, and the output terminal of the second NAND gate is the second output terminal of the logic gate circuit.

[0068] Among them, the logical operation of the NAND gate is that when one or more of the input terminals are at a low level, the output is a high level; only when all inputs are at a high level, the output is a low level.

[0069] In an embodiment of the present application, the first switch module includes three groups of first terminals, numbered as a first group of first terminals, a second group of first terminals, and a third group of first terminals. The first input terminal of the first NAND gate is connected to a first terminal of the first group of first terminals, and another first terminal of the first group of first terminals is connected to a DC power supply. The second input terminal of the first NAND gate is connected to a first terminal of the second group of first terminals, and another first terminal of the second group of first terminals is connected to a DC power supply. The third input terminal of the first NAND gate is connected to a first terminal of the third group of first terminals, and another first terminal of the third group of first terminals is connected to a DC power supply.

[0070] During the process of closing the power box cover 2 on the power box body 1, if the three groups of first pins in the second connector 12 respectively connected to the three groups of first terminals of the first switch module are plugged into the corresponding group of pins in the fourth connector 22, the two first terminals of each group of the three groups of first terminals of the first switch module are connected, the first input terminal, the second input terminal and the third input terminal of the first NAND gate are all connected to the DC power supply, the first input terminal, the second input terminal and the third input terminal of the first NAND gate are all high level 1, the output terminal of the first NAND gate is low level 0, the first input terminal, the second input terminal and the third input terminal of the second NAND gate are all low level 0, and the output terminal of the second NAND gate is high level 1, so that the detection switch is switched to the on state.

[0071] If a group of first pins in the second connector 12 that is connected to a group of first terminals among the three groups of first terminals of the first switch module is not connected to a corresponding group of pins in the fourth connector 22, two first terminals of a group of first terminals among the three groups of first terminals of the first switch module are not connected, one of the first input terminal, the second input terminal and the third input terminal of the first NAND gate is not connected to the DC power supply, the output terminal of the first NAND gate is a high level 1, the first input terminal, the second input terminal and the third input terminal of the second NAND gate are all high level 1, and the output terminal of the second NAND gate is a low level 0, thereby switching the detection switch to the disconnected state.

[0072] In the embodiment of the present application, through the cooperation of the first NAND gate and the second NAND gate, when at least one group of pins of the second connector 12 and the fourth connector 22 are not plugged in, the logic gate circuit outputs a low level, and the detection switch is switched to the disconnected state, so that the first switch module is in the disconnected state, the second end of the power terminal is not connected to the first connector 11, and the external power supply is not electrically connected to the receiving card, so that the receiving card is not powered on, which can prevent the user from being electrocuted.

[0073] In an optional embodiment, the delay circuit includes a first switch tube, a second switch tube and a capacitor;

[0074] The control end of the first switch tube is the first input end of the delay circuit, the input end of the first switch tube is the second input end of the delay circuit, and the output end of the first switch tube is grounded;

[0075] The control end of the second switch tube is connected to the input end of the first switch tube, the input end of the second switch tube is connected to the output end of the first switch tube, and the output end of the second switch tube is the output end of the delay circuit;

[0076] One end of the capacitor is connected to the control end of the second switch tube, and the second end of the capacitor is connected to the input end of the second switch tube.

[0077] The first switch tube includes but is not limited to a MOS tube and a triode, and the second switch tube includes but is not limited to a MOS tube and a triode.

[0078] In the embodiment of the present application, the first switch tube is a MOS tube, and the second switch tube is a triode. The gate of the MOS tube is connected to the output end of the second NAND gate, the drain of the MOS tube is connected to the output end of the first NAND gate, and the source of the MOS tube is grounded. The collector of the triode is connected to the first input end of the detection switch, the base of the triode is connected to the drain of the MOS tube, and the emitter of the triode is grounded. The on and off of the current is controlled by the MOS tube and the triode, and the capacitor is controlled to charge and discharge, thereby delaying the electrical signal.

[0079] Through the cooperation of the first switch tube, the second switch tube and the capacitor, the first switch tube and the second switch tube control the on and off of the current, so that the capacitor is charged and discharged. The charging and discharging of the capacitor requires a certain amount of time, which can achieve the delay of the electrical signal in the first switch module.

[0080] In an optional embodiment, a second voltage conversion module is also installed on the adapter board;

[0081] The input end of the second voltage conversion module is connected to the second end of the power supply terminal, and the output end of the second voltage conversion module is connected to each group of first terminals of the first switch module. The second voltage conversion module is used to convert the strong voltage signal provided by the external power supply into a weak voltage signal to provide a DC power supply for each group of first terminals of the first switch module.

[0082] The second voltage conversion module is used to convert a strong voltage signal into a weak voltage signal. Specifically, the second voltage conversion module includes but is not limited to a transformer, a voltage stabilizer, and a resistor voltage divider circuit.

[0083] In an embodiment of the present application, the strong voltage signal provided by the external power supply flows into the second voltage conversion module through the power supply terminal, and the second voltage conversion module converts the strong voltage signal into a weak voltage signal, and outputs the weak voltage signal to each group of first terminals of the first switch module.

[0084] Through the second voltage conversion module, the strong voltage signal provided by the external power supply can be converted into a weak voltage signal, and the weak voltage signal can be provided to each group of first connection terminals of the first switch module. There is no need to set up a fixed DC power supply, thereby simplifying the structure and reducing costs.

[0085] In one embodiment, see Figure 3 , the present application also provides an LED display screen, including an LED box 100 and a plurality of LED light panels 200, the LED box 100 including the above-mentioned LED display screen power box 110;

[0086] When a plurality of LED light panels 200 are installed on the LED box 100 , each LED light panel 200 is connected to a receiving card in the LED display screen power box 110 .

[0087] In the embodiment of the present application, the LED display screen is composed of a plurality of LED boxes 100, and each LED box 100 can be installed with a plurality of LED light panels 200 and an LED display screen power box 110. The receiving card of the LED display screen power box 110 includes a plug-in for external connection, which can be connected to the plug-in of the LED light panel 200 to realize the electrical connection between the receiving card and the LED light panel 200.

[0088] The LED display screen provided in the embodiment of the present application includes the above-mentioned LED display screen power box, so the LED display screen provided in the embodiment of the present application also has the same advantages as the LED display screen power box of the above-mentioned embodiment.

[0089] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0090] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A LED display power box, characterized in that: It includes a power box body and a power box cover; The power box body is provided with an adapter board, on which power terminals, at least one first plug-in module, at least one first switch module and a receiving card are installed; the first plug-in module includes a first connector and a second connector; the second connector includes a plurality of groups of first pins, and the first switch module includes a plurality of groups of first terminals, an input terminal and an output terminal; The first end of the power terminal is connected to an external power supply, the second end of the power terminal is connected to an input end of the first switch module, each group of the first terminal of the first switch module is respectively connected to a group of the first pins of the second connector, each group of the first terminal of the first switch module is also connected to a DC power supply, and the output end of the first switch module is connected to the first connector; the second connector is connected to one end of the receiving card, and the other end of the receiving card is connected to the LED display screen; At least one first voltage conversion module and at least one second plug-in module are installed on the power box cover, and the second plug-in module includes a third plug-in component and a fourth plug-in component; the input end of the first voltage conversion module is connected to the third plug-in component, and the output end of the first voltage conversion module is connected to the fourth plug-in component; When the power box cover is closed on the power box body, the first switch module detects the level signal of the DC power supply through the plug-in cooperation of the third connector and the plug-in cooperation of the fourth connector and the second connector, the first switch module is connected, the second end of the power terminal is connected to the first connector via the first switch module, the external power supply is connected to the receiving card, and power is supplied to the LED display.

2. The LED display power supply box according to claim 1, characterized in that: During the process of closing the power box cover on the power box body, when there are a preset number of groups of first pins in the second connector that are all plugged into a corresponding group of pins in the fourth connector, the first switch module detects the level signal of the DC power supply, the first switch module is connected, and the second end of the power terminal is connected to the first connector via the first switch module.

3. The LED display power supply box according to claim 2, characterized in that: The power box body and the power box cover are connected via a hinge; When a preset number of groups of first pins in the second connector are all plugged into a corresponding group of pins in the fourth connector, the first switch module detects a level signal of the DC power supply, the first switch module is connected, and the second end of the power terminal is connected to the first connector via the first switch module, including: When the first pins of the target group in the second connector are connected to a corresponding group of pins in the fourth connector, the first switch module detects the level signal of the DC power supply, the first switch module is connected, and the second end of the power terminal is connected to the first connector via the first switch module; wherein, the first pins of the target group are the last group of first pins in the second connector arranged in sequence away from the hinge.

4. The LED display screen power supply box according to claim 3, characterized in that: The first connector is arranged on a side of the adapter plate close to the hinge, and the second connector is arranged on a side of the adapter plate away from the hinge.

5. The LED display screen power supply box according to claim 2, characterized in that: The first switch module includes a logic gate circuit, a delay circuit and a detection switch; The input end of the logic gate circuit is each group of the first connection terminals of the first switch module, the first output end of the logic gate circuit is connected to the first input end of the delay circuit, and the second output end of the logic gate circuit is connected to the second input end of the delay circuit; the output end of the delay circuit is connected to the first input end of the detection switch; the second input end of the detection switch is the input end of the switch module, the third input end of the detection switch is connected to the DC power supply, and the output end of the detection switch is the output end of the switch module.

6. The LED display screen power supply box according to claim 5, characterized in that: The logic gate circuit includes a first NAND gate and a second NAND gate; The first input terminal, the second input terminal and the third input terminal of the first NAND gate are the input terminals of the logic gate circuit, the output terminal of the first NAND gate is the first output terminal of the logic gate circuit, which is connected to the first input terminal, the second input terminal and the third input terminal of the second NAND gate, and the output terminal of the second NAND gate is the second output terminal of the logic gate circuit.

7. The LED display screen power supply box according to claim 5, characterized in that: The delay circuit includes a first switch tube, a second switch tube and a capacitor; The control end of the first switch tube is the first input end of the delay circuit, the input end of the first switch tube is the second input end of the delay circuit, and the output end of the first switch tube is grounded; The control end of the second switch tube is connected to the input end of the first switch tube, the input end of the second switch tube is connected to the output end of the first switch tube, and the output end of the second switch tube is the output end of the delay circuit; One end of the capacitor is connected to the control end of the second switch tube, and the second end of the capacitor is connected to the input end of the second switch tube.

8. The LED display screen power supply box according to claim 2, characterized in that: A second voltage conversion module is also installed on the adapter board; The input end of the second voltage conversion module is connected to the second end of the power terminal, and the output end of the second voltage conversion module is connected to each group of the first terminals of the first switch module. The second voltage conversion module is used to convert the strong voltage signal provided by the external power supply into a weak voltage signal to provide the DC power supply for each group of the first terminals of the first switch module.

9. The LED display screen power supply box according to any one of claims 1 to 8, characterized in that: The first plug-in connector is a plug spring, and the third plug-in connector is a spring leaf.

10. The LED display screen power supply box according to any one of claims 1 to 8, characterized in that: The second connector is a female socket, and the fourth connector is a male socket.

11. An LED display screen, comprising an LED box and a plurality of LED light panels, wherein the LED box comprises the LED display screen power supply box according to any one of claims 1 to 10; When a plurality of the LED light panels are installed on the LED box, each of the LED light panels is connected to a receiving card in the LED display screen power box.

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