LED power supply, control method and LED display device

Abstract

The present application provides an LED power supply, a control method and an LED display device, wherein the LED power supply comprises: an alternating current (AC) input port, an AC / DC module, a first port, a thyristor module and a display unit power supply output port, wherein the AC / DC module is connected to the AC input port and the first port respectively, and the thyristor module is connected to the AC input port, the display unit power supply output port and the first port respectively. The display unit and the sending card can be powered at the same time, and when the user wants to use the LED display screen, the LED power supply only needs to be plugged into a power socket, which is more convenient than the method of operating a distribution box and an equipment cabinet in the prior art.

Description

Technical Field

[0001] The present application relates to the field of display screens, and in particular to an LED power supply, a control method and an LED display device. Background Art

[0002] LED display screens have the advantages of high brightness, long life and wide viewing angle, and are widely used in outdoor advertising media, stage backgrounds and traffic guidance. LED display screens include many display units, and the LED display screen can present different images by controlling the lighting or closing of each display unit. The lighting or closing of each display unit is controlled by the sending card in the LED display screen.

[0003] In the prior art, the display unit and the sending card are powered independently. The display unit is powered by a distribution box, and the sending card is usually installed on an equipment cabinet and powered by the equipment cabinet.

[0004] The independent power supply method in the prior art has complicated wiring, causing inconvenience to users. Summary of the invention

[0005] The present application provides an LED power supply, a control method and an LED display device, which are used to solve the problem in the prior art that the display unit and the sending card are independently powered, causing inconvenience to the user.

[0006] In a first aspect, the present application provides an LED power supply, comprising: an alternating current (AC) input port, an AC / DC module, a first port, a thyristor module and a display unit power supply output port, wherein the AC / DC module is respectively connected to the AC input port and the first port, and the thyristor module is respectively connected to the AC input port, the display unit power supply output port and the first port; the AC / DC module is used to convert the alternating current inputted into the AC input port into direct current, and output the direct current to a sending card through the first port; the thyristor module is used to control whether to supply power to the display unit connected to the thyristor module through the display unit power supply output port according to a control signal inputted from the sending card through the first port.

[0007] Optionally, the thyristor module includes: a power supply control circuit, a drive circuit and a power supply circuit connected in sequence, the power supply control circuit is connected to the first port, and the power supply circuit is respectively connected to the AC input port and the display unit power supply output port.

[0008] Optionally, the driving circuit includes a first driving unit and a second driving unit, the power supply circuit includes a first power supply unit and a second power supply unit, the power supply control circuit, the first driving unit and the first power supply unit are connected in sequence, the power supply control circuit, the second driving unit and the second power supply unit are connected in sequence, the first power supply unit and the second power supply unit are both connected to the power supply output port of the display unit, and the first power supply unit and the second power supply unit are also connected to the AC input port.

[0009] Optionally, the power supply control circuit includes a first transistor, the base of the first transistor is connected to the first port, the emitter of the first transistor is grounded, the collector of the first transistor is connected to the second port, and the voltage input to the second port is a preset voltage.

[0010] Optionally, the thyristor module also includes a first resistor and a second resistor, the collector of the first transistor is connected to the second port through the first resistor, the second resistor, the first driving unit includes a first optocoupler, the light source of the first optocoupler is connected to both ends of the first resistor, the light receiver of the first optocoupler is connected to the first power supply unit, and the second driving unit includes a second optocoupler, the light source of the second optocoupler is connected to both ends of the second resistor, and the light receiver of the second optocoupler is connected to the second power supply unit.

[0011] Optionally, the anode of the first power supply unit is connected to the AC input port, and the cathode of the first power supply unit is connected to the power supply output port of the display unit; the cathode of the second power supply unit is connected to the AC input port, and the anode of the second power supply unit is connected to the power supply output port of the display unit.

[0012] In a second aspect, the present application provides a control method, which is applied to the LED power supply provided in the first aspect, including: the AC / DC module converts the alternating current input by the AC input port into direct current, and outputs the direct current to a sending card through the first port, so that the sending card works under the drive of the direct current; the thyristor module controls whether to supply power to the display unit connected to the thyristor module through the display unit power supply output port according to a control signal input by the sending card through the first port.

[0013] Optionally, the thyristor module controls whether to supply power to the display unit connected to the thyristor module through the display unit power supply output port according to a control signal input by the sending card through the first port, including: if the control signal is an on-signal, the thyristor module is turned on, so that the thyristor module can supply power to the display unit connected to the thyristor module through the display unit power supply output port; if the control signal is an off-signal, the thyristor module is turned off, so that the thyristor module cannot supply power to the display unit connected to the thyristor module through the display unit power supply output port.

[0014] Optionally, the thyristor module is turned on including: the power supply control circuit, the first drive unit, the second drive unit, the first power supply unit and the second power supply unit are turned on, so that when the AC voltage input to the AC input port enters the positive half cycle from the negative half cycle and the phase is exactly 0 degrees, the AC power input to the AC input port is transmitted to the display unit power supply output port through the first power supply unit, and when the AC voltage input to the AC input port enters the negative half cycle from the positive half cycle and the phase is exactly 180 degrees, the AC power input to the AC input port is transmitted to the display unit power supply output port through the second power supply unit.

[0015] In a third aspect, the present application provides an LED display device, comprising the LED power supply, sending card and display unit provided in the first aspect.

[0016] The present application provides an LED power supply, a control method and an LED display device. An AC / DC module is provided in the LED power supply. After the user plugs the LED power supply into a power socket, the AC power on the power socket is input into the AC / DC module and the thyristor module through the AC input port. The AC / DC module converts the AC power into DC power and outputs the DC power to the sending card. The sending card starts working under the drive of the DC power and inputs a control signal to the thyristor module through the first port. The thyristor module controls whether to supply power to the corresponding display unit through the display unit power supply output port according to the control signal sent by the sending card. It can be seen that the LED power supply provided by the present application can supply power to the display unit and the sending card at the same time. When the user wants to use the LED display screen, he only needs to plug the LED power supply into the power socket. Compared with the method of operating the distribution box and the equipment cabinet in the prior art, the operation is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a display unit provided for this application;

[0018] Figure 2 This is a schematic diagram of the structure of the first embodiment of the LED power supply provided in this application;

[0019] Figure 3 The LED power supply provided in this application includes a schematic diagram of the structure of multiple thyristor modules;

[0020] Figure 4 This is a schematic diagram of the structure of the second embodiment of the LED power supply provided in this application;

[0021] Figure 5 A schematic diagram of the structure of the thyristor module provided in this application;

[0022] Figure 6 This is a schematic diagram of the structure of the third embodiment of the LED power supply provided in this application.

[0023] Description of reference numerals:

[0024] 10: AC input port;

[0025] 11: AC / DC module;

[0026] 12: First port;

[0027] 13: Silicon controlled rectifier module;

[0028] 14: Display unit power supply output port;

[0029] 131: power supply control circuit;

[0030] 132: driving circuit;

[0031] 133: power supply circuit;

[0032] 1321: first driving unit;

[0033] 1322: second driving unit;

[0034] 1331: a first power supply unit;

[0035] 1332: a second power supply unit;

[0036] 15: Second port;

[0037] 134: first resistor;

[0038] 135: The second resistor. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. 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.

[0040] In the present application, it should be explained that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " is generally used to indicate that the objects associated with each other are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a alone, b alone, c alone, a combination of a and b, a combination of a and c, a combination of b and c, or a combination of a, b and c, where a, b, c can be single or multiple.

[0041] The LED display screen includes multiple display units. Figure 1 It is a schematic diagram of multiple display units. It can be understood that Figure 1 The number of display units and the arrangement of the display units are only examples, and the present application is not limited thereto. By controlling the lighting or shutting down of each display unit, the LED display screen can present different images, such as Figure 1 As shown, the display units numbered 2, 3, 6, 10, 11, 14, and 18 are lit, and the display units numbered 1, 4, 5, 7, 8, 9, 12, 13, 15, 16, 17, 19, and 20 are turned off, so that the LED display screen can present the letter F. The lighting or shutting down of each display unit is controlled by the sending card. In some embodiments, the display unit and the sending card are independently powered, and the display unit is powered by a distribution box. The sending card is usually installed on an equipment cabinet and powered by the equipment cabinet. When the user wants to turn on or off the display screen, he not only needs to operate the distribution box, but also the equipment cabinet, which causes inconvenience to the user.

[0042] The present application provides an LED power supply, in which an AC / DC module is arranged. After the user plugs the LED power supply into a power socket, on the one hand, the AC power provided by the power socket can power the display unit, and on the other hand, the AC / DC module can convert the AC power provided by the power socket into DC power, and output the DC power to the sending card, so that the sending card can work under the drive of the DC power. In this way, the display unit and the sending card are powered uniformly, and one power socket can solve the power supply problem of the two parts. Compared with the independent power supply method, the user operation is simpler and the user experience is improved.

[0043] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0044] Figure 2 This is a schematic diagram of the structure of the first embodiment of the LED power supply provided by this application. Figure 2 As shown, the LED power supply provided in this embodiment includes: an alternating current (AC) input port 10, an AC / DC module 11, a first port 12, a thyristor module 13 and a display unit power supply output port 14. The AC / DC module 11 is connected to the AC input port 10 and the first port 12 respectively, and the thyristor module 13 is connected to the AC input port 10, the display unit power supply output port 14 and the first port 12 respectively.

[0045] In a possible implementation, the LED power supply includes only one thyristor module 13 , and the thyristor module 13 is connected to all display units via the display unit power supply output port 14 .

[0046] In another possible implementation, the LED power supply includes a plurality of thyristor modules 13, and the display unit power supply output port 14 of each thyristor module 13 is connected to a plurality of display units.

[0047] In this embodiment, the AC / DC module 11 may adopt an existing design, which will not be described in detail in this application.

[0048] The following introduces Figure 2 The principle of LED power supply shown:

[0049] After the user plugs the LED power supply into the power socket, the AC power on the power socket is input to the AC / DC module 11 and the thyristor module 13 through the AC input port 10. The AC / DC module 11 converts the AC power input from the AC input port 10 into DC power, and outputs the DC power to the sending card through the first port 12. The sending card starts working under the drive of the DC power, and inputs a control signal to the thyristor module 13 through the first port 12. The thyristor module 13 controls whether to supply power to the corresponding display unit through the display unit power supply output port 14 according to the control signal. Specifically, if the control signal is a conduction signal, the thyristor module 13 is turned on, so that the thyristor module 13 can supply power to the corresponding display unit through the display unit power supply output port 14, and the corresponding display unit is lit; if the control signal is a shutdown signal, the thyristor module 13 is turned off, so that the thyristor module 13 cannot supply power to the corresponding display unit through the display unit power supply output port 14, and the corresponding display unit is turned off.

[0050] Here are some examples:

[0051] Combination Figure 1 The display unit shown, such as Figure 3 As shown, it is assumed that the LED power supply includes 12 thyristor modules 13, and the 12 thyristor modules 13 are all connected to the first port 12. In addition, the 12 thyristor modules 13 are also connected to the AC input port 10 ( Figure 3 Assume Figure 3 The first thyristor module 13 from top to bottom is connected to the display unit power supply output port 14 Figure 1 The display units with the numbers 1, 5, 9, 13, and 17 are connected to the thyristor modules 13 through the display unit power supply output ports 14. Figure 1 The display units with the numbers 2, 6, 10, 14, 18, 3, 7, 11, 15, 19, the 12th thyristor module 13 is connected through the display unit power supply output port 14 Figure 1Display units numbered 4, 8, 12, 16, and 20. After the user plugs the LED power supply into the power socket, the AC power on the power socket is input to the AC / DC module 11 and the 12 thyristor modules 13 through the AC input port 10. The AC / DC module 11 converts the AC power input from the AC input port 10 into DC power, and outputs the DC power to the sending card through the first port 12. The sending card starts working under the drive of the DC power, and inputs control signals to the 12 thyristor modules 13 through the first port 12. Assuming that the control signal input to the first thyristor module 13 is a shutdown signal, the control signals input to the second, third, fourth, fifth, sixth, seventh, and ninth thyristor modules 13 are lighting signals, and the control signals input to the eighth, tenth, eleventh, and twelfth thyristor modules 13 are shutdown signals, then the first thyristor module 13 is turned off, and the first thyristor module 13 cannot supply power to the thyristor modules numbered 1, 5, 9, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, The display units 17 are powered, and the display units labeled 1, 5, 9, 13, and 17 are turned off; the second, third, fourth, fifth, sixth, seventh, and ninth thyristor modules 13 are turned on, and the second, third, fourth, fifth, sixth, seventh, and ninth thyristor modules 13 can supply power to the display units labeled 2, 6, 10, 14, 18, 3, and 11 through the display unit power supply output port 14. The display units 18, 3, 11 are powered on; the 8th, 10th, 11th, and 12th thyristor modules 13 are turned off, and the 8th, 10th, 11th, and 12th thyristor modules 13 cannot supply power to the display units 7, 15, 19, 4, 8, 12, 16, and 20 through the display unit power supply output port 14. The display units 7, 15, 19, 4, 8, 12, 16, and 20 are turned off, so that the LED display screen appears Figure 1 The letter F.

[0052] The LED power supply provided in this embodiment is provided with an AC / DC module. After the user plugs the LED power supply into a power socket, the AC power on the power socket is input into the AC / DC module and the thyristor module through the AC input port. The AC / DC module converts the AC power into DC power and outputs the DC power to the sending card. The sending card starts working under the drive of the DC power and inputs a control signal to the thyristor module through the first port. The thyristor module controls whether to supply power to the corresponding display unit through the display unit power output port according to the control signal sent by the sending card. It can be seen that the LED power supply provided in this application can supply power to the display unit and the sending card at the same time. When the user wants to use the LED display screen, he only needs to plug the LED power supply into the power socket. Compared with the method of operating the distribution box and the equipment cabinet in the prior art, the operation is more convenient.

[0053] Figure 4 This is a schematic diagram of the structure of the second embodiment of the LED power supply provided by this application. This embodiment provides a possible design structure of the thyristor module 13. Figure 4 As shown, in the LED power supply provided in this embodiment, the thyristor module 13 includes: a power supply control circuit 131, a drive circuit 132 and a power supply circuit 133 connected in sequence, the power supply control circuit 131 is connected to the first port 12, and the power supply circuit 133 is respectively connected to the AC input port 10 and the display unit power supply output port 14.

[0054] It should be noted that: Figure 4 The LED power supply includes a thyristor module 13 as an example for description. Figure 3 As shown, if the LED power supply includes a plurality of thyristor modules 13, each thyristor module 13 is designed as Figure 4 The structure shown.

[0055] For a possible implementation, see Figure 5 As shown, in order to adapt to the AC characteristics of the alternating current input into the AC input port 10, the driving circuit 132 may include a first driving unit 1321 and a second driving unit 1322, the power supply circuit 133 may include a first power supply unit 1331 and a second power supply unit 1332, the power supply control circuit 131, the first driving unit 1321 and the first power supply unit 1331 are connected in sequence, the power supply control circuit 131, the second driving unit 1322 and the second power supply unit 1332 are connected in sequence, the first power supply unit 1331 and the second power supply unit 1332 are both connected to the display unit power supply output port 14, and the first power supply unit 1331 and the second power supply unit 1332 are also connected to the AC input port 10.

[0056] The following introduces Figure 5 The principle of the thyristor module 13 shown is:

[0057] After the user plugs the LED power supply into the power socket, the AC power on the power socket is input to the AC / DC module 11 and the thyristor module 13 through the AC input port 10. The AC / DC module 11 converts the AC power input from the AC input port 10 into DC power, and outputs the DC power to the sending card through the first port 12. The sending card starts working under the drive of the DC power, and inputs a control signal to the power supply control circuit 131 through the first port 12. If the control signal is a conduction signal, the power supply control circuit 131, the first drive unit 1321, the second drive unit 1322, and the first drive unit 1323 are turned on. The first power supply unit 1331 and the second power supply unit 1332 are turned on, so that when the AC voltage inputted into the AC input port 10 enters the positive half cycle from the negative half cycle and the phase is just 0 degrees, the AC inputted into the AC input port 10 is transmitted to the display unit power supply output port 14 through the first power supply unit 1331, and when the AC voltage inputted into the AC input port 10 enters the negative half cycle from the positive half cycle and the phase is just 180 degrees, the AC inputted into the AC input port 10 is transmitted to the display unit power supply output port 14 through the second power supply unit 1332, so that the corresponding display unit is lit. If the control signal is a shutdown signal, the power supply control circuit 131, the first driving unit 1321, the second driving unit 1322, the first power supply unit 1331 and the second power supply unit 1332 are turned off, and the thyristor module 13 cannot supply power to the display unit connected to the thyristor module 13 through the display unit power supply output port 14, so that the corresponding display unit is turned off.

[0058] It should be noted that: Figure 3 Any thyristor module 13 can use the above principle to control the lighting or closing of the corresponding display unit, and this application will not be used for Figure 3 The control principles of all thyristor modules 13 are not described in detail.

[0059] The LED power supply provided in this embodiment provides a possible design structure of a thyristor module. Specifically, the thyristor module includes: a power supply control circuit, a drive circuit and a power supply circuit connected in sequence. In order to adapt to the AC characteristics of the alternating current input to the AC input port, the drive circuit is designed as two units, namely a first drive unit and a second drive unit. The power supply circuit is correspondingly designed as two units, namely a first power supply unit and a second power supply unit. When the control signal is a conduction signal, no matter whether the voltage value of the alternating current input to the AC input port is positive or negative, the display unit power supply output port can supply power to the corresponding display unit.

[0060] Figure 6 This is a schematic diagram of the structure of the third embodiment of the LED power supply provided in this application. Figure 5Based on the embodiment shown in FIG. 1 , this embodiment provides a possible design structure of a power supply control circuit 131, a first driving unit 1321, a second driving unit 1322, a first power supply unit 1331, and a second power supply unit 1332. In this embodiment, the power supply control circuit 131 includes a first transistor, such as Figure 6 As shown, the base of the first transistor is connected to the first port 12, the emitter of the first transistor is grounded, the collector of the first transistor is connected to the second port 15, and the voltage input to the second port 15 is a preset voltage. Exemplarily, the preset voltage can be 12V.

[0061] Optional, see Figure 6 As shown, the thyristor module 13 also includes a first resistor 134 and a second resistor 135, the collector of the first transistor is connected to the second port 15 through the first resistor 134 and the second resistor 135, the first driving unit 1321 includes a first optical coupler, the light source of the first optical coupler is connected to both ends of the first resistor 134, the light receiver of the first optical coupler is connected to the first power supply unit 1331, and the second driving unit 1322 includes a second optical coupler, the light source of the second optical coupler is connected to both ends of the second resistor 135, the light receiver of the second optical coupler is connected to the second power supply unit 1332. In addition, the anode of the first power supply unit 1331 is connected to the AC input port 10, and the cathode of the first power supply unit 1331 is connected to the display unit power supply output port 14; the cathode of the second power supply unit 1332 is connected to the AC input port 10, and the anode of the second power supply unit 1332 is connected to the display unit power supply output port 14.

[0062] The following introduces Figure 6 The principle shown:

[0063] After the user plugs the LED power supply into the power socket, the AC power on the power socket is input to the AC / DC module 11 and the thyristor module 13 through the AC input port 10. The AC / DC module 11 converts the AC power input from the AC input port 10 into DC power, and outputs the DC power to the sending card through the first port 12. The sending card starts working under the drive of the DC power, and sends a control signal to the first transistor through the first port 12. When the control signal is a conduction signal, the first transistor is turned on, the power supply path between the second port 15 and the ground is turned on, and the current passes through the light source of the first optical coupler and the second optical coupler, and the first optical coupler and the second optical coupler start working. When the first optocoupler detects that the AC voltage input to the AC input port 10 enters the positive half cycle from the negative half cycle and the phase is exactly 0 degrees, the first optocoupler drives the first power supply unit 1331 to turn on, and the AC input to the AC input port 10 is transmitted to the display unit power supply output port 14 through the first power supply unit 1331. When the second optocoupler detects that the AC voltage input to the AC input port 10 enters the negative half cycle from the positive half cycle and the phase is exactly 180 degrees, the second optocoupler drives the second power supply unit 1332 to turn on, and the AC input to the AC input port 10 is transmitted to the display unit power supply output port 14 through the second power supply unit 1332, so that the corresponding display unit is lit. When the control signal is a shutdown signal, the first transistor is cut off, the power supply path between the second port 15 and the ground is disconnected, the first optocoupler and the second optocoupler cannot work, and since the first power supply unit 1331 does not receive the driving signal of the first optocoupler and the second power supply unit 1332 does not receive the driving signal of the second optocoupler, the first power supply unit 1331 and the second power supply unit 1332 are in the shutdown state, so that the thyristor module 13 cannot supply power to the display unit connected to the thyristor module 13 through the display unit power supply output port 14, so that the corresponding display unit is turned off.

[0064] It should be noted that: Figure 3 Any thyristor module 13 can use the above principle to control the lighting or closing of the corresponding display unit, and this application will not be used for Figure 3 The control principles of all thyristor modules 13 are not described in detail.

[0065] The LED power supply provided in this embodiment provides a possible design structure of a power supply control circuit, a first drive unit, a second drive unit, a first power supply unit and a second power supply unit. The LED power supply provided in this application can power the display unit and the sending card at the same time. When the user wants to use the LED display screen, he only needs to plug the LED power supply into the power socket. Compared with the method of operating the distribution box and the equipment cabinet in the prior art, the operation is more convenient.

[0066] The present application provides an LED display screen, comprising the LED power supply, the sending card and the corresponding display unit described in any of the above embodiments.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An LED power supply, characterized in that: include: An alternating current (AC) input port, an AC / DC module, a first port, a thyristor module and a display unit power supply output port, wherein the AC / DC module is connected to the AC input port and the first port respectively, and the thyristor module is connected to the AC input port, the display unit power supply output port and the first port respectively, and the thyristor module includes: a power supply control circuit, a drive circuit and a power supply circuit connected in sequence; The AC / DC module is used to convert the alternating current inputted from the AC input port into direct current, and output the direct current to the sending card through the first port; The thyristor module is used to control whether to supply power to the display unit connected to the thyristor module through the display unit power supply output port according to the control signal input by the sending card through the first port; The driving circuit includes a first driving unit and a second driving unit, the power supply circuit includes a first power supply unit and a second power supply unit, the power supply control circuit, the first driving unit and the first power supply unit are connected in sequence, the power supply control circuit, the second driving unit and the second power supply unit are connected in sequence, the first power supply unit and the second power supply unit are both connected to the power supply output port of the display unit, and the first power supply unit and the second power supply unit are also connected to the AC input port.

2. The LED power supply according to claim 1, characterized in that: The power supply control circuit is connected to the first port, and the power supply circuit is respectively connected to the AC input port and the display unit power supply output port.

3. The LED power supply according to claim 1, characterized in that: The power supply control circuit includes a first transistor, the base of the first transistor is connected to the first port, the emitter of the first transistor is grounded, the collector of the first transistor is connected to the second port, and the voltage input to the second port is a preset voltage.

4. The LED power supply according to claim 3, wherein, The thyristor module also includes a first resistor and a second resistor, the collector of the first transistor is connected to the second port through the first resistor and the second resistor, the first driving unit includes a first optocoupler, the light source of the first optocoupler is connected to both ends of the first resistor, the light receiver of the first optocoupler is connected to the first power supply unit, and the second driving unit includes a second optocoupler, the light source of the second optocoupler is connected to both ends of the second resistor, and the light receiver of the second optocoupler is connected to the second power supply unit.

5. The LED power supply according to claim 4, wherein, The anode of the first power supply unit is connected to the AC input port, and the cathode of the first power supply unit is connected to the display unit power output port; the cathode of the second power supply unit is connected to the AC input port, and the anode of the second power supply unit is connected to the display unit power output port.

6. A control method, applied to the LED power supply according to any one of claims 1-5, characterized in that, include: The AC / DC module converts the alternating current input from the AC input port into direct current, and outputs the direct current to the sending card through the first port, so that the sending card works under the drive of the direct current; The thyristor module controls whether to supply power to the display unit connected to the thyristor module through the display unit power supply output port according to the control signal input by the sending card through the first port.

7. The control method according to claim 6, characterized in that The thyristor module controls whether to supply power to the display unit connected to the thyristor module through the display unit power supply output port according to the control signal input by the sending card through the first port, including: If the control signal is a conduction signal, the thyristor module is turned on, so that the thyristor module can supply power to the display unit connected to the thyristor module through the display unit power supply output port; If the control signal is a shutdown signal, the thyristor module is shut down, so that the thyristor module cannot supply power to the display unit connected to the thyristor module through the display unit power supply output port.

8. The method according to claim 7, characterized in that The thyristor module conduction includes: The power supply control circuit, the first drive unit, the second drive unit, the first power supply unit and the second power supply unit are turned on, so that when the AC voltage input to the AC input port enters the positive half cycle from the negative half cycle and the phase is exactly 0 degrees, the AC input to the AC input port is transmitted to the display unit power supply output port through the first power supply unit, and when the AC voltage input to the AC input port enters the negative half cycle from the positive half cycle and the phase is exactly 180 degrees, the AC input to the AC input port is transmitted to the display unit power supply output port through the second power supply unit.

9. An LED display device, characterized in that: It comprises the LED power supply, the sending card and the display unit as described in any one of claims 1 to 5.

Images