A spliced LED display system

Abstract

The present application relates to a spliced LED display screen system, which includes a plurality of display boxes and a plurality of power supply units electrically connected to the display boxes; the power supply unit includes a power supply part connected to a three-phase line, a grounding part connected to a ground wire, and a switching part that obtains three-phase power through electrical connection and selects one of the three-phase lines for the power supply part; each power supply unit forms a power supply module in series through the switching part, and the power supply module alternately selects one of the three-phase lines to supply power to the display boxes, forming a three-phase cyclic power supply transmission path. When a user distributes power supply to the LED display screen system, the display boxes can be directly connected to the power supply parts of the power supply units in sequence, so that the display boxes are alternately connected to one of the three-phase lines in sequence, achieving the effect of evenly distributing the load, simplifying the wiring method, and reducing the risk of wiring errors by operators. The present application has the effect of reducing labor costs or later maintenance costs.

Description

Technical Field

[0001] This application relates to the field of large LED displays, and in particular to a tiled LED display system. Background Art

[0002] In the field of large display technologies, the videos to be displayed are often larger than the hardware size of individual LED displays to create a large stage, theater, or immersive experience. Specific applications include exhibition halls, complex screens, and sky screens, where the overall display size can start from hundreds of screens and reach thousands or even tens of thousands of screens.

[0003] The large display is composed of multiple display boxes. As the overall size of the large display increases, the number of display boxes also increases and their distribution becomes more complex. The large display is usually powered by alternating current. Due to the large number of display boxes, if single-phase AC wires are used for power supply, the load on the cable power supply may be too large, increasing the risk of damaging electronic components.

[0004] Refer to Figure 1 , in the related art, three-phase AC cables are also used to supply power to the display box 1 of the large display to achieve the effect of evenly distributing the load. However, the display box 1 needs to be alternately connected to the three-phase lines, and the wiring process is relatively cumbersome. Moreover, as the number of spliced boxes increases, the difficulty of this cable power supply during wiring is greater, increasing the risk of wiring errors by operators and increasing the labor cost and post-maintenance cost. Summary of the Invention

[0005] To reduce the wiring difficulty, this application provides a tiled LED display system.

[0006] The tiled LED display system provided by this application adopts the following technical solution:

[0007] A tiled LED display system includes a plurality of display boxes and a plurality of power supply units electrically connected to the display boxes;

[0008] The power supply unit includes a power supply part connected to the three-phase line, a grounding part connected to the ground wire, and a switching part that obtains three-phase power through electrical connection and selects one of the three-phase lines for the power supply part;

[0009] Each of the power supply units forms a power supply module by being connected in series through the switching part. The power supply module alternately selects one of the three-phase lines to supply power to the display boxes, forming a three-phase cyclic power supply transmission path.

[0010] By adopting the above technical solution, the power supply module uses the switching unit to connect adjacent power supply units to different live wires in the three-phase line, and each power supply unit is connected to the ground wire through the grounding unit, establishing a mode in which each power supply unit is alternately connected to the three-phase line in the power supply module, forming a power supply transmission path of three-phase line alternating cycle. When the user distributes power to the LED display system, each display cabinet can be directly connected to the power supply part of each power supply unit in sequence, so that each display cabinet is alternately connected to one of the three-phase lines in sequence, achieving the effect of evenly distributing the load while simplifying the wiring method, reducing the risk of wiring errors of operators, and thus reducing the labor cost or the later maintenance cost.

[0011] Preferably, the power supply part includes a first-order position that connects one of the three-phase lines and supplies power to the display cabinet, and waiting positions that are respectively connected to the remaining two phases in the three-phase line. The waiting positions include a second-order position and a last-order position;

[0012] The three power supply units connected in sequence along the power supply direction are the first unit, the second unit, and the third unit;

[0013] Wherein the first-order position of the first unit, the second-order position of the second unit, and the last-order position of the third unit are sequentially connected through the first live wire;

[0014] The second-order position of the first unit, the last-order position of the second unit, and the first-order position of the third unit are sequentially connected through the second live wire;

[0015] The last-order position of the first unit, the first-order position of the second unit, and the last-order position of the third unit are sequentially connected through the third live wire.

[0016] By adopting the above technical solution, the live wire passing through the first-order position of the first unit passes through the second-order position of the second unit and the last-order position of the third unit in sequence, and then returns to the first-order position of another first unit (the fourth unit), forming a cycle that sequentially passes through three positions; similarly, the live wire passing through the second-order position passes through the last-order position and the first-order position in sequence, and then returns to the second-order position; similarly, the live wire passing through the last-order position passes through the first-order position and the second-order position in sequence, and then returns to the last-order position. In this way, any one of the three-phase lines is sequentially replaced among the first-order position, the second-order position, and the last-order position, and returns to the original position after being replaced twice, forming an alternating cycle of the three-phase line.

[0017] Preferably, the switching unit at the input end of the power supply unit includes an a access port, a b access port, and a c access port; the switching unit at the output end of the power supply unit includes an a output port, a b output port, and a c output port;

[0018] The live wire corresponding to the first-order position connects the a access port and the b output port;

[0019] The phase line corresponding to the said order bit connects the b inlet and the c outlet;

[0020] The phase line corresponding to the said last order bit connects the c inlet and the a outlet.

[0021] By adopting the above technical solution, after the user connects the a inlet, b inlet and c inlet of the power supply unit to the a outlet, b outlet and c outlet in sequence, the phase line connecting the first order bit in the power supply unit connects the order bit of the next power supply unit, the phase line connecting the order bit in the power supply unit connects the last order bit of the next power supply unit, and the phase line connecting the last order bit in the power supply unit connects the first order bit of the next power supply unit, thus completing the alternating connection of the three-phase lines. This way enables the position exchange of the three-phase lines inside the power supply unit, reduces the difficulty of external wiring for the user, and is more convenient and direct.

[0022] Preferably, the power supply unit is provided with a rigid signal plug and a rigid signal socket that is plugged and matched with the rigid signal plug;

[0023] The a inlet, the b inlet and the c inlet are integrated in the rigid signal plug;

[0024] The a outlet, the b outlet and the c outlet are integrated in the rigid signal socket.

[0025] By adopting the above technical solution, the user can plug and match the rigid signal plug with the rigid signal socket to connect the a inlet with the a outlet, the b inlet with the b outlet, and the c inlet with the c outlet.

[0026] Preferably, it further includes a host for driving each display box body to work. The power supply unit is provided with a bus network port for communicating and connecting with the adjacent power supply unit. The starting end and the ending end of the power supply module are respectively in communication connection with the host through the bus network port; the communication network port includes an access network port integrated in the rigid signal plug and an output network port integrated in the rigid signal socket.

[0027] By adopting the above technical solution, the user can plug and match the rigid signal plug with the rigid signal socket to connect each power supply unit to the host through the access network port and the output network port, thereby connecting the power supply module to the host.

[0028] Preferably, the power supply unit is provided with a total power supply output port for supplying power to the display box body. The power supply output port is connected to the phase line in the first order bit; the display box body is provided with a power supply input port for connecting the power supply output port.

[0029] By adopting the above technical solution, the display box body is connected to the total power supply output port of the power supply unit through the power supply input port, so that each display box body can be connected to the phase wire corresponding to the first sequence position.

[0030] Preferably, the power supply unit is provided with a communication network port for driving the display box body to work, and the communication network port is connected to the access network port; the display box body is provided with a signal input port for connecting the communication network port.

[0031] By adopting the above technical solution, the display box body is connected to the communication network port through the signal input port, so as to communicate with the host, and the user can drive the display box body to work through the host.

[0032] Preferably, each of the display box bodies forms an m×n matrix, where m is the number of rows and n is the number of columns. Each of the display box bodies located in the same column is connected in parallel along the column direction and connected to the corresponding power supply unit.

[0033] By adopting the above technical solution, multiple display box bodies form an m×n display screen matrix. Each of the display box bodies located in the same column is connected in parallel, so that the voltages of the display box bodies located in the same column are equal. The user can add multiple display box bodies in parallel along the column direction transmission path, which is convenient for the user to layout or adjust the display box bodies.

[0034] Preferably, the power supply unit is provided with a total signal output head integrating the total power supply output port and the communication network port. The display box body is provided with a signal receiving head for plugging and matching with the total signal plug, and a secondary signal output head for connecting the signal receiving heads of adjacent power supply units;

[0035] The power supply input port and the signal input port are integrated in the signal receiving head; the secondary power supply output port for connecting to the power supply input port and the signal output port for connecting to the signal input port are integrated in the secondary signal output head.

[0036] By adopting the above technical solution, the power supply unit is connected to the signal receiving head of the display box body through the total signal output head, so that the communication network port is connected to the signal input port and the total power supply output port is connected to the power supply input port; adjacent power supply units are connected through the secondary signal output head and the signal receiving head, so that the signal output port is connected to the signal input port and the secondary power supply output port is connected to the power supply input port, and further each of the display box bodies located in the same column is connected to the corresponding power supply unit. Description of the Drawings

[0037] Figure 1 It is a three-phase power supply schematic diagram of an LED display screen system in the related art.

[0038] Figure 2It is a schematic diagram of three-phase power supply for the spliced LED display screen system in the embodiment of the present application.

[0039] Figure 3 It is a schematic diagram of the structure of the power supply unit in the embodiment of the present application.

[0040] Figure 4 It is a schematic diagram of the connection of the power supply unit, the display box body, and the power supply host in the embodiment of the present application.

[0041] Figure 5 It is a schematic diagram of the arrangement of adjacent power supply units in the embodiment of the present application.

[0042] Explanation of reference numerals: 1. Display box body; 11. Power module; 12. Control card; 13. Signal receiving head; 131. Power supply input port; 132. Signal input port; 14. Secondary signal output head; 141. Secondary power supply output port; 142. Signal output port; 2. Power supply host; 21. Host socket; 3. Power supply unit; 301. First unit; 302. Second unit; 303. Third unit; 304. Fourth unit; 31. Hard signal plug; 311. Access network port; 32. Hard signal socket; 321. Output network port; 33. Total signal output head; 331. Total power supply output port; 332. Communication network port; 4. Power supply department; 41. First order position; 42. Second order position; 43. Last order position; 5. Grounding department; 51. Grounding position; 511. Grounding inlet; 512. Grounding outlet; 6. Switching department; 61. a inlet; 62. b inlet; 63. c inlet; 64. a outlet; 65. b outlet; 66. c outlet. Detailed implementation manners

[0043] The following will further describe the present application in detail with reference to the attached Figures 1-5 drawings.

[0044] The embodiment of the present application discloses a spliced LED display screen system. Refer to Figure 2 , the LED display screen system includes a plurality of display box bodies 1 that are spliced to form an LED display screen, a power supply host 2 that outputs three-phase power and drives the LED display screen to work, and a plurality of power supply units 3 that are sequentially connected in series to the power supply host 2 and supply three-phase power to each display box body 1; in this embodiment, the number of display box bodies 1 and the number of power supply units 3 are both greater than four.

[0045] Refer to Figure 2 and Figure 3, the power supply unit 3 includes a power supply part 4 for connecting three-phase lines (i.e., three live wires), a grounding part 5 for connecting the ground wire, and a switching part 6 for enabling each power supply unit 3 to obtain three-phase electricity. The power supply part 4 includes a first-order position 41 and a waiting position; one of the phase lines in the three-phase lines is connected to the first-order position 41, and the remaining two phase lines are respectively connected to the waiting position. The waiting position includes a sequential position 42 and a last-order position 43, so that the three-phase lines are distributed at different positions; the grounding part 5 includes a grounding position 51, and the grounding position 51 is connected to the ground wire. In this embodiment, the phase line corresponding to the first-order position 41 is connected to the corresponding display box body 1 for power supply.

[0046] Refer to Figure 3 , the switching part 6 can be connected to the output end of the power supply unit 3 and the input end of the adjacent power supply unit 3, so that each power supply unit 3 is connected in series in turn to form a power supply module. The switching part 6 located at the input end of the power supply unit 3 includes an a access port 61, a b access port 62, and a c access port 63; the a output port 64, b output port 65, and c output port 66 located at the output end of the power supply unit 3. The power supply unit 3 can be connected to the a output port 64 of the adjacent power supply unit 3 through the a access port 61; the power supply unit 3 can be connected to the b output port 65 of the adjacent power supply unit 3 through the b access port 62; the power supply unit 3 can be connected to the c output port 66 of the adjacent power supply unit 3 through the c access port 63; the grounding position 51 is connected with a ground access port 511 and a ground output port 512 through the ground wire, and the power supply unit 3 can be connected to the ground output port 512 of the adjacent power supply unit 3 through the ground access port 511.

[0047] Refer to Figure 3 and Figure 4 , in each power supply unit 3, the first phase line corresponding to the first-order position 41 is connected to the a access port 61 and the b output port 65, the second phase line corresponding to the sequential position 42 is connected to the b access port 62 and the c output port 66, and the third phase line corresponding to the last-order position 43 is connected to the c access port 63 and the a output port 64; when adjacent power supply units 3 are connected, the first phase line originally corresponding to the first-order position 41 can be switched to the sequential position 42 or the last-order position 43 in the two adjacent power supply units 3; the second phase line originally corresponding to the sequential position 42 can be switched to the last-order position 43 or the first-order position 41 in the two adjacent power supply units 3; the third phase line originally corresponding to the last-order position 43 can be switched to the first-order position 41 or the sequential position 42 in the two adjacent power supply units 3, so as to realize the transformation of the distribution of the three-phase lines.

[0048] Refer to Figure 5, in the power supply module, four power supply units 3 distributed along the power supply direction form a first unit 301, a second unit 302, a third unit 303, and a fourth unit 304 (the cycle of the first unit 301). When the first unit 301, the second unit 302, the third unit 303, and the fourth unit 304 are connected in sequence, the first-order bit 41 of the first unit 301, the second-order bit 42 of the second unit 302, the last-order bit 43 of the third unit 303, and the first-order bit 41 of the fourth unit 304 are connected in sequence through the same first-phase line, that is, the phase line corresponding to the first-order bit 41 is connected to the second-order bit 42 and the last-order bit 43 in sequence along the power supply direction, and then connected back to the first-order bit 41, forming a transformation of the same phase line at the positions of each power supply unit 3.

[0049] Similarly, the second-order bit 42 of the first unit 301, the last-order bit 43 of the second unit 302, the first-order bit 41 of the third unit 303, and the second-order bit 42 of the fourth unit 304 are connected in sequence through the same second-phase line, that is, the phase line corresponding to the second-order bit 42 is connected to the last-order bit 43 and the first-order bit 41 in sequence along the power supply direction, and then connected back to the second-order bit 42, forming a transformation of the same phase line at the positions of each power supply unit 3.

[0050] Similarly, the last-order bit 43 of the first unit 301, the first-order bit 41 of the second unit 302, the second-order bit 42 of the third unit 303, and the last-order bit 43 of the fourth unit 304 are connected in sequence through the same third-phase line, that is, the phase line corresponding to the last-order bit 43 is connected to the first-order bit 41 and the second-order bit 42 in sequence along the power supply direction, and then connected back to the last-order bit 43, forming a transformation of the same phase line at the positions of each power supply unit 3.

[0051] Refer to Figure 5 , in the connection of the three-phase lines in the first unit 301, the second unit 302, the third unit 303, and the fourth unit 304, a cycle is formed in which all three phase lines can pass through the first-order bit 41, the second-order bit 42, and the last-order bit 43 in sequence and return to the original position, so that all three phase lines can pass through the first-order bit 41 in different power supply units 3. Since any four continuously connected power supply units 3 in the power supply module can form a combination of the first unit 301, the second unit 302, the third unit 303, and the fourth unit 304, and the power supply module supplies power to the display box 1 through the phase lines corresponding to the first-order bit 41 respectively, the power supply module can alternately select one of the three-phase lines to supply power to the corresponding display box 1, forming a three-phase cyclic power supply transmission path.

[0052] Refer to Figure 4, a rigid signal plug 31 is connected to the input end of the power supply unit 3, and the a inlet 61, b inlet 62, and c inlet 63 are all integrated in the rigid signal plug 31. The output end of the power supply unit 3 is connected to a rigid signal socket 32, and the a output port 64, b output port 65, and c output port 66 are all integrated in the rigid signal socket 32. The rigid signal plug 31 and the rigid signal socket 32 can form a signal connection structure through plugging, so that adjacent power supply units 3 are electrically connected. The rigid plug or the rigid socket has a high transmission rate, good stability, and is convenient for users to install and disassemble. In this embodiment, the power supply host 2 is provided with a host socket 21 having a signal connection structure that forms a plug-in fit with the rigid signal plug 31. The power supply unit 3 at the starting end of the power supply module is connected to the socket of the power supply host 2 through the rigid signal plug 31, realizing the electrical connection between the power supply module and the power supply host 2.

[0053] Refer to Figure 4 , the power supply unit 3 is provided with a bus network port for establishing a communication connection with the power supply host 2. The bus network port includes an access network port 311 provided at the input end of the power supply unit 3 and an output network port 321 provided at the output end of the power supply unit 3. The access network port 311 and the output network port 321 are electrically connected through a signal line. The access network port 311 of the power supply unit 3 can be connected to the output network port 321 of an adjacent power supply unit 3; among them, the access network port 311 is integrated in the rigid signal plug 31, and the output network port 321 is integrated in the rigid signal socket 32. After the rigid signal plug 31 of the power supply unit 3 is connected to the rigid signal socket 32 of an adjacent power supply unit 3, a communication connection is established within the power supply module. Among them, the power supply unit 3 at the starting end of the power supply module is connected to the host socket 21 of the power supply host 2 through the rigid signal plug 31 to establish communication with the power supply host 2.

[0054] Refer to Figure 4 , a total signal output head 33 is provided on one side of the power supply unit 3. A total power supply output port 331 and a communication network port 332 are integrated in the total signal output head 33. Among them, the total power supply output port 331 is electrically connected to the first phase line corresponding to the first sequence position 41 and the fourth phase line corresponding to the ground position 51 respectively, and the communication network port 332 is electrically connected to the access network port 311 through a signal line.

[0055] Refer to Figure 4 , a power supply module 11 and a control card 12 are built in the display box body 1, and the power supply module 11 is electrically connected to the control card 12. A signal receiving head 13 for connecting to the total signal output head 33 is provided on one side of the display box body 1. A power supply input port 131 and a signal input port 132 are integrated in the signal receiving head 13. Among them, the power supply input port 131 is electrically connected to the power supply module 11, and the signal input port 132 is electrically connected to the control card 12. In this embodiment, the signal receiving head 13 can be plugged into the total signal output head 33 to form a signal connection structure.

[0056] Referring to Figure 2 and Figure 4 In this embodiment, each display box body 1 forms an m×n display screen matrix, where m is the number of rows and n is the number of columns. Each display box body 1 located in the same column establishes a signal connection relationship with one power supply unit 3 in the power supply module.

[0057] Referring to Figure 2 and Figure 4 On one side of the display box body 1, a secondary signal output head 14 for outputting electrical signals to the adjacent display box body 1 in the column direction is provided. The secondary signal output head 14 integrates a secondary power supply output port 141 and a signal output port 142. The secondary power supply output port 141 is electrically connected to the power supply module 11, and the signal output port 142 is electrically connected to the control card 12. In this embodiment, when two adjacent display box bodies 1 in the column direction are connected, the secondary signal output head 14 of one display box body 1 and the signal receiving head 13 of the adjacent display box body 1 form a signal connection structure through plugging, so that each display box body 1 located in the same column is electrically connected to the corresponding power supply unit 3. In this embodiment, each display box body 1 located in the same column is connected in parallel in the column direction, and the input voltages of each display box body 1 located in the same column are the same. The user can add multiple display box bodies 1 in parallel along the transmission path in the column direction, which is convenient for the user to layout or adjust the display box body 1.

[0058] The implementation principle of a splicing type LED display screen system in an embodiment of the present application is as follows: The connection methods of each internal connection interface in each power supply unit 3 are the same, and the user can use the same wiring method to connect each interface in the power supply unit 3. When the user assembles the LED display screen system, each display box body 1 corresponding to each column can be connected through the secondary signal output head 14 and the signal receiving head 13, and the display box body 1 at the starting end of the same column is connected to the power supply unit 3 through the signal receiving head 13. Each power supply unit 3 can be electrically connected to form a power supply module through the cooperation of a hard signal plug 31 and a hard signal socket 32. After the power supply module at the starting end of the power supply module is connected to the power supply host 2 through the hard signal plug 31, the power supply module can obtain three-phase electricity through the power supply host 2. Since the power supply module has the effect of alternately selecting one of the three-phase lines to supply power to the corresponding display box body 1, the power supply unit 3 and each power supply unit 3 in the adjacent column can be connected to different phase lines, establishing a cyclic mode in which each display box body 1 in each column of the LED display system alternately selects one of the three-phase lines for connection, achieving the effect of evenly distributing the load while simplifying the wiring method and reducing the risk of wiring errors by operators, thereby reducing the labor cost or the later maintenance cost.

[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A spliced LED display system, characterized in that: It includes several display boxes (1) and several power supply units (3) electrically connected to the display boxes (1). The power supply unit (3) includes a power supply part (4) connected to three-phase lines, a grounding part (5) connected to a ground wire, and a switching part (6) that obtains three-phase power through electrical connection and selects one of the three-phase lines for the power supply part (4). Each of the power supply units (3) forms a power supply module by being connected in series through the switching part (6). The power supply module alternately selects one of the three-phase lines to supply power to the display box (1), forming a three-phase cyclic power supply transmission path. The power supply part (4) includes a first-order position (41) connected to one of the three-phase lines and supplying power to the display box (1), and waiting positions respectively connected to the remaining two phases of the three-phase lines. The waiting positions include a second-order position (42) and a last-order position (43). Three power supply units (3) connected in sequence along the power supply direction are a first unit (301), a second unit (302), and a third unit (303). Among them, the first-order position (41) of the first unit (301), the second-order position (42) of the second unit (302), and the last-order position (43) of the third unit (303) are sequentially connected through a first-phase line. The second-order position (42) of the first unit (301), the last-order position (43) of the second unit (302), and the first-order position (41) of the third unit (303) are sequentially connected through a second-phase line. The last-order position (43) of the first unit (301), the first-order position (41) of the second unit (302), and the last-order position (43) of the third unit (303) are sequentially connected through a third-phase line.

2. The spliced LED display system according to claim 1, wherein: The switching part (6) at the input end of the power supply unit (3) includes an a inlet (61), a b inlet (62), and a c inlet (63); the switching part (6) at the output end of the power supply unit (3) includes an a outlet (64), a b outlet (65), and a c outlet (66). The phase line corresponding to the first-order position (41) connects the a inlet (61) and the b outlet (65). The phase line corresponding to the second-order position (42) connects the b inlet (62) and the c outlet (66). The phase line corresponding to the last-order position (43) connects the c inlet (63) and the a outlet (64).

3. The spliced LED display screen system according to claim 2, characterized in that: The power supply unit (3) is provided with a rigid signal plug (31) and a rigid signal socket (32) that is inserted and matched with the rigid signal plug (31). The a inlet (61), the b inlet (62), and the c inlet (63) are integrated in the rigid signal plug (31). The a outlet (64), the b outlet (65), and the c outlet (66) are integrated in the rigid signal socket (32).

4. The spliced LED display system according to claim 3, wherein: It further includes a host for driving each of the display boxes (1) to work. The power supply unit (3) is provided with a bus network port for communicating and connecting with an adjacent power supply unit (3). The start end and the end end of the power supply module are respectively communicated and connected with the host through the bus network port. The bus network port includes an access network port (311) integrated in the rigid signal plug (31) and an output network port (321) integrated in the rigid signal socket (32).

5. The spliced LED display system according to claim 4, wherein: The power supply unit (3) is provided with a total power supply output port (331) for supplying power to the display box (1). The power supply output port is connected to the phase line in the first order position (41). The display box (1) is provided with a power supply input port (131) for connecting the power supply output port.

6. The spliced LED display system according to claim 5, wherein: The power supply unit (3) is provided with a communication network port (332) for driving the display box (1) to work. The communication network port (332) is connected to the access network port (311). The display box (1) is provided with a signal input port (132) for connecting the communication network port (332).

7. The spliced LED display screen system according to claim 6, characterized in that: Each of the display boxes (1) forms an m×n display screen matrix, where m is the number of rows and n is the number of columns. The display boxes (1) in the same column are connected in parallel along the column direction and are connected to the corresponding power supply unit (3).

8. The spliced LED display screen system according to claim 7, wherein: The power supply unit (3) is provided with a total signal output head (33) integrating the total power supply output port (331) and the communication network port (332). The display box (1) is provided with a signal receiving head (13) for plugging and mating with the total signal output head (33), and a secondary signal output head (14) for connecting the signal receiving heads (13) of adjacent power supply units (3). The power supply input port (131) and the signal input port (132) are integrated in the signal receiving head (13). The secondary signal output head (14) is integrated with a secondary power supply output port (141) for connecting to the power supply input port (131) and a signal output port (142) for connecting to the signal input port (132).

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