Display module, display device and display system

Abstract

The application provides a display module, a display device and a display system. The display module comprises an isolation voltage reduction module and a display assembly. The input end of the isolation voltage reduction module in all display modules is used for connecting the output pin of a three-phase power supply circuit to receive a first direct current signal, and the first direct current signal is subjected to voltage reduction processing to output a power supply signal to supply power to the display assembly. The three-phase power supply circuit is used for converting a three-phase input signal into the first direct current signal, and the first direct current signal is greater than a preset voltage value. The display module of the application is suitable for a direct current high-voltage bus power distribution system.

Description

Technical Field

[0001] This application relates to the field of display power supply technology, and in particular to a display module, display device, and display system. Background Technology

[0002] The current mainstream and mature technology for power supply systems of outdoor LED (Light Emitting Diode) displays is a single-module independent distributed power supply architecture. However, existing single-module power supplies cannot be adapted to 400V DC high-voltage bus distribution systems. Summary of the Invention

[0003] This application provides a display module, display device, and display system adapted to a DC high-voltage bus power distribution system.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: to provide a display module, the display module including: an isolation step-down module and a display component; The input terminal of the isolation step-down module is used to connect to the output pin of the three-phase power supply circuit to receive the first DC signal, and to step down the first DC signal to output a power supply signal to power the display component; wherein, the three-phase power supply circuit is used to convert the three-phase input signal into the first DC signal, and the first DC signal is greater than a preset voltage value.

[0005] In one embodiment, the isolation step-down module includes: The input filtering unit is used to connect to the output pin of the three-phase power supply circuit and to filter the first DC signal. An isolation step-down unit, connected to an input filter unit, is used to step down the first DC signal to obtain a power supply signal; The output filtering unit, connected to the isolation step-down unit, is used to filter the power supply signal and output it.

[0006] In one embodiment, the isolation step-down module further includes: The sampling feedback unit, connected to the output filtering unit, is used to sample the power supply signal to obtain the first sampled signal. The control unit connects the sampling feedback unit and the isolation step-down unit, and is used to control the output power supply signal of the isolation step-down unit based on the first sampling signal.

[0007] In one embodiment, the isolation step-down unit includes at least one of: a DC-DC isolation step-down unit and an LLC isolation step-down unit; The LLC isolated step-down unit includes: The resonant unit is connected to the input filter unit; An isolation transformer connects the resonant unit and the output filter unit, and is used to step down the first DC signal to obtain the power supply signal.

[0008] In one embodiment, the isolation step-down module further includes: Optical coupler connects the sampling feedback unit and the control unit.

[0009] In one embodiment, the isolation step-down module further includes: The communication control unit, connected to the control unit, is used to receive external adjustment signals and transmit them to the control unit so that the control unit can control the isolation step-down unit to output power supply signals.

[0010] In one embodiment, the communication control unit includes: a communication interface, a communication circuit, and an output control circuit; The communication interface is used to receive external adjustment signals; the communication circuit connects the communication interface and the output control circuit, and is used to transmit the external adjustment signals to the output control circuit; the output control circuit connects to the control unit, and is used to generate adjustment commands based on the external adjustment signals, so that the control unit controls the isolation step-down unit to output power supply signals based on the adjustment commands.

[0011] In one embodiment, all the isolated step-down modules are connected via a communication bus and are also connected to the host system via the communication bus.

[0012] In one embodiment, the first DC signal is 320V~420V; the power supply signal is 3.0V~5.0V.

[0013] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide a display device, including: a plurality of display modules, the plurality of display modules being arranged in an array, and the display modules including any of the display modules described above.

[0014] In one embodiment, all the isolated buck modules in the display modules are connected via a communication bus and are connected to the host system via the communication bus.

[0015] To solve the above-mentioned technical problems, another technical solution adopted in this application is: to provide a display system, comprising: The three-phase power supply circuit includes a three-phase power module and a busbar module. The three-phase power module includes multiple three-phase power units, whose input terminals are connected in parallel and connected to a power receiver to receive three-phase input signals. The three-phase power units are used to process the three-phase input signals and output a first DC signal. The busbar module includes multiple input pins and multiple output pins, with each input pin corresponding to the output terminal of a three-phase power unit. The display device includes a plurality of display modules; the display modules include any of the display modules described above. The input terminals of the isolated step-down modules in all display modules are connected to an output pin to receive a first DC signal, which is used to step down the first DC signal and output a power supply signal to power the display components.

[0016] The beneficial effects of this application are as follows: Unlike existing technologies, the display module provided in this application includes an isolated step-down module and a display component. The input terminal of the isolated step-down module is connected to the output pin of a three-phase power supply circuit to receive a first DC signal, which is then stepped down to output a power supply signal to power the display component. The three-phase power supply circuit converts the three-phase input signal into a first DC signal, and this first DC signal is greater than a preset voltage value. The display module of this application is compatible with DC high-voltage busbar power distribution systems. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the first embodiment of the display module provided in this application; Figure 2 This is a schematic diagram of the structure of a first embodiment of the isolation step-down module in the display module of this application; Figure 3 for Figure 2 A schematic diagram of an embodiment of the input filtering unit in the isolation step-down module shown; Figure 4 for Figure 2 A schematic diagram of an embodiment of the output filtering unit in the isolation buck module shown; Figure 5 This is a schematic diagram of the structure of a second embodiment of the isolation step-down module in the display module of this application; Figure 6 This is a schematic diagram of the structure of a third embodiment of the isolation step-down module in the display module of this application; Figure 7 for Figure 6 A schematic diagram of an embodiment of the isolation step-down unit in the isolation step-down module shown; Figure 8 This is a schematic diagram of the fourth embodiment of the isolation step-down module in the display module of this application; Figure 9 for Figure 8 A schematic diagram of an embodiment of the sampling feedback unit, optocoupler, and control unit; Figure 10 This is a structural schematic diagram of the fifth embodiment of the isolation step-down module in the display module of this application; Figure 11 A schematic diagram of the structure of a first embodiment of the display device provided in this application; Figure 12 A schematic diagram of the structure of a second embodiment of the display device provided in this application; Figure 13 This is a schematic diagram of the structure of an embodiment of the display system provided in this application. Specific Implementation The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0020] In the following description, specific details such as particular system architectures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.

[0021] In this article, the term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, "more" in this article means two or more objects.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0023] Before providing a further detailed description of the embodiments of this application, the nouns and terms involved in the embodiments of this application will be explained, and the nouns and terms involved in the embodiments of this application shall be interpreted as follows.

[0024] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Please see Figure 1 , Figure 1This is a schematic diagram of the structure of a display module according to an embodiment of this application. Specifically, the display module 30 includes an isolation step-down module 31 and a display component 32. The input terminal of the isolation step-down module 31 is connected to the output pin Pc of the three-phase power supply circuit 10 to receive a first DC signal Vdc1. The isolation step-down module 31 is used to step down the first DC signal Vdc1, thereby outputting a power supply signal VG to power the display component 32; wherein, the three-phase power supply circuit 10 is used to convert the three-phase input signal into the first DC signal Vdc1. The first DC signal Vdc1 is greater than a preset voltage value. The three-phase input signal Vac is the effective value of the line voltage of the three-phase AC power.

[0026] It should be noted that the isolation step-down module 31 in module 30 of this application is used to convert the high-voltage first DC signal Vdc1 into a low-voltage power supply signal VG. In one embodiment, the first DC signal Vdc1 is 320V~420V. Specifically, the first DC signal Vdc1 can be 320V, 380V, 400V, 420V, etc., and is not limited thereto. The power supply signal VG is 3.0V~5.0V. It is understood that the preset voltage value is 220V AC mains voltage, or, in other embodiments, the preset voltage value is greater than 220V AC mains voltage.

[0027] The display module 30 of this application is equipped with an isolation step-down module 31, which can convert the 320V~420V first DC signal Vdc1 provided by the three-phase power supply circuit 10 into a 3.0V~5.0V power supply signal VG, thereby powering the display component 32. This allows the display module 30 of this application to be compatible with DC high-voltage bus distribution systems. Simultaneously, because the isolation step-down module 31 has an isolation function, it can electrically disconnect the 320V~420V high-voltage side from the 3.0V~5.0V low-voltage side, eliminating the DC path. In the event of high-voltage leakage, breakdown, or short circuit, the high voltage will not flow back to the low-voltage circuit, ensuring reliability.

[0028] Specifically, the three-phase power supply circuit 10 is located in the distribution cabinet. The distribution cabinet is an outdoor waterproof primary distribution cabinet, located at the front end of the overall power supply, and serves as the centralized power distribution hub for the large screen's power system. The distribution cabinet has several output pins Pc that can output the first DC signal Vdc1. The display module 30 is connected to a corresponding output pin Pc via a power distribution cable, thereby receiving the first DC signal Vdc1.

[0029] In one embodiment, combined with Figure 2The isolation step-down module 31 of this application includes: an input filter unit 311, an isolation step-down unit 312, and an output filter unit 313. The input filter unit 311 is used to connect to the output pin Pc of the three-phase power supply circuit 10, receive the first DC signal Vdc1, and filter the first DC signal Vdc1 to filter out the common-mode and differential-mode interference signals of the first DC signal Vdc1.

[0030] Specifically, the input filter unit 311 can filter out low-frequency pulsations and high-frequency ripples in high-voltage DC, suppress voltage spikes and power disturbances, and provide a clean and stable high-voltage DC signal for the subsequent power conversion circuit.

[0031] In one embodiment, combined with Figure 3 , Figure 3 This is a schematic diagram of an embodiment of the input filtering unit 311 of this application. The input filtering unit 311 includes a pre-stage input filtering unit 3111, a common-mode inductor L2, and a post-stage input filtering unit 3112. The pre-stage input filtering unit 3111 includes a varistor RV1, an X differential-mode capacitor CX2, a Y common-mode capacitor CY1, a Y common-mode capacitor CY4, and bleeder resistors (R6, R7, R10, R11, R15, R16). The varistor RV1 and the X differential-mode capacitor CX2 are connected in parallel between pins P1 and P2. One end of the Y common-mode capacitor CY1 is connected to the main line of pin P1, and the other end is connected to protective ground; one end of the Y common-mode capacitor CY4 is connected to the main line of pin P2, and the other end is connected to protective ground. Bleeder resistors R6, R10, and R15 are connected in series to form a first bleeder branch, and bleeder resistors R7, R11, and R16 are connected in series to form a second bleeder branch. The first and second bleeder branches are connected in parallel between pins P1 and P2. The input filter unit 3112 includes an X-type differential capacitor CX1 and multiple electrolytic capacitors (EC1, EC2, EC3) connected in parallel. The X-type differential capacitor CX1 and the electrolytic capacitors EC1, EC2, EC3 are connected in parallel between the Q1 pin and the Q2 pin.

[0032] The isolation step-down unit 312 is connected to the input filter unit 311 and is used to step down the first DC signal Vdc1 to obtain the power supply signal VG.

[0033] The output filtering unit 313 is connected to the isolation step-down unit 312 and is used to filter and output the power supply signal VG. Specifically, the output filtering unit 313 is used to filter out low-voltage DC ripple and switching spikes, suppress voltage disturbances caused by load dynamic fluctuations, and provide a low-ripple, high-stability low-voltage DC power supply signal for the display component 32.

[0034] Combination Figure 4The output filter unit 313 includes multiple electrolytic capacitors (EC4, EC5, EC6, EC7, EC8) connected in parallel between pins N1 and N2. The output filter unit 313 also includes a bleed resistor R13, with its first end connected to the main line of pin N1 and its second end grounded. The first end of the Y common-mode capacitor CY2 is connected to the main line of pin N1, and its second end is connected to protective ground. The first end of the Y common-mode capacitor CY3 is connected to protective ground, and its second end is connected to the main line of pin N2.

[0035] In one embodiment, combined with Figure 5 The isolation step-down module 31 further includes a sampling feedback unit 314 and a control unit 315. The sampling feedback unit 314 is connected to the output filter unit 313 and is used to sample the power supply signal VG to obtain a first sampling signal. The control unit 315 is connected to the sampling feedback unit 314 and the isolation step-down unit 312 and is used to control the output of the power supply signal VG of the isolation step-down unit 312 based on the first sampling signal. In this embodiment, the sampling feedback unit 314 and the control unit 315 are set to form a closed-loop negative feedback path. The sampling feedback unit 314 collects the real voltage of the power supply signal VG in real time, and the control unit 315 compares the sampling signal with the internal reference voltage to form a closed-loop adjustment. When the load changes, such as the brightness of the display component 32 or the refresh rate, the power supply signal VG can be adjusted in real time according to the load change, ensuring that the power supply signal VG always maintains a rated stable value regardless of fluctuations in the input high-voltage bus or changes in the weight of the downstream load, thereby improving the display effect.

[0036] In one embodiment, the isolation buck unit 312 includes at least one of a DC-DC isolation buck unit and an LLC isolation buck unit.

[0037] In one specific embodiment, combined with Figure 6 When the isolation step-down unit 312 is an LLC isolation step-down unit, the isolation step-down unit 312 includes a resonant unit 3121 and an isolation transformer 3122. The resonant unit 3121 is connected to the input filter unit 311. The isolation transformer 3122 is connected to the resonant unit 3121 and the output filter unit 313, and is used to step down the first DC signal Vdc1 to obtain the power supply signal VG.

[0038] In one embodiment, combined with Figure 7The resonant unit 3121 includes a resonant inductor L3 and a resonant capacitor C1. The isolation transformer 3122 includes a transformer T1, which includes a primary winding B1, a first secondary winding B2, and a second secondary winding B3. The first terminal of the resonant inductor L3 is connected to the second terminal of the switch M3, the second terminal of the resonant inductor L3 is connected to the first terminal of the primary winding B1, the first terminal of the resonant capacitor C1 is connected to the second terminal of the primary winding B1, and the second terminal of the resonant capacitor C1 is grounded.

[0039] Specifically, the isolation step-down unit 312 also includes a primary-side half-bridge driver unit 3123 and a secondary-side rectifier output unit 3124. The primary-side half-bridge driver unit 3123 includes switches M3 and M5. The first path terminal of switch M3 is connected to the voltage input terminal VPFC and the Q1 pin. The control terminal of switch M3 receives the control signal Drv_A through resistor R5. The second path terminal of switch M3 is connected to the control terminal of switch M3 through resistor R12, and is also connected to the first path terminal of switch M5 and the first terminal of resonant inductor L3. The control terminal of switch M5 receives the control signal Drv_B through resistor R14. The second path terminal of switch M5 is connected to the control terminal of switch M5 through resistor R19, and is also connected to the second terminal of resonant capacitor C1 and grounded. The second path terminal of switch M5 is also connected to the Q2 pin. The secondary-side rectifier output unit 3124 includes switches M1, M2, M4, M6, M7, and M8. Switch M1's first path terminal is connected to the first terminal of the first secondary winding B2, and its second path terminal is connected to the N2 pin. The control terminal of switch M1 is connected to its second path terminal via resistor R1, and receives the control signal SR_G1 via resistor R2. Switch M2's first path terminal is connected to the first terminal of the first secondary winding B2, and its second path terminal is connected to the N2 pin. The control terminal of switch M2 is connected to its second path terminal via resistor R3, and receives the control signal SR_G1 via resistor R4. Switch M4's first path terminal is connected to the first terminal of the first secondary winding B2, and its second path terminal is connected to the N2 pin. The control terminal of switch M4 is connected to its second path terminal via resistor R9, and receives the control signal SR_G1 via resistor R8. Switch M6's first-path terminal is connected to the second terminal of the second secondary winding B3. Switch M6's second-path terminal is connected to pin N2. Switch M6's control terminal is connected to its second-path terminal via resistor R17, and receives the control signal SR_G2 via resistor R18. Switch M7's first-path terminal is connected to the second terminal of the second secondary winding B3. Switch M7's second-path terminal is connected to pin N2. Switch M7's control terminal is connected to its second-path terminal via resistor R21, and receives the control signal SR_G2 via resistor R20. Switch M8's first-path terminal is connected to the second terminal of the second secondary winding B3. Switch M8's second-path terminal is connected to pin N2. Switch M8's control terminal is connected to its second-path terminal via resistor R22, and receives the control signal SR_G2 via resistor R24. It should be noted that the second terminal of the first secondary winding B2 is connected to the first terminal of the second secondary winding B3 and is also connected to pin N1.

[0040] In one embodiment, such as Figure 8As shown, the isolation step-down module 31 also includes an optocoupler 316, which connects the sampling feedback unit 314 and the control unit 315. It should be noted that the isolation transformer 3122 only isolates the main power circuit formed by the primary and secondary sides. However, the sampling feedback unit 314 is directly connected to the control unit 315, which may break down the insulation and connect the high-voltage side and the low-voltage side, thus losing its isolation protection purpose. Therefore, this embodiment sets up an optocoupler 316 between the sampling feedback unit 314 and the control unit 315. The internal light-emitting diode (low voltage on the secondary side) and the phototransistor (high voltage on the primary side) of the optocoupler 316 have no electrical conductor connection. Information is transmitted through optical signals, blocking the high and low voltage DC paths, thereby achieving electrical insulation between the high-voltage primary side control and the low-voltage secondary side sampling feedback unit. This ensures the safety of personnel and the display screen load, meets safety regulations for isolation withstand voltage, and achieves mutual isolation between high and low voltage faults. Low-voltage load short circuits and high-voltage side surge faults will not be mutually propagated, improving the overall reliability of the module and the back-end display screen.

[0041] Combination Figure 9 The sampling feedback unit 314 includes resistors R31, R32, R33, R34, and R35, capacitors C7, C8, and C9, and an error amplifier D. The first terminal of resistor R31 is connected to the anode of the LED in optocoupler 316, and the second terminal of resistor R31 is connected to the output filter unit 313. The first terminal of resistor R32 is connected to the output filter unit 313 to sample the power supply signal VG; the first terminal of resistor R33 is connected to the second terminal of resistor R32, and the second terminal of resistor R33 is grounded. The first terminal of resistor R34 is connected to the first terminal of resistor R32 through capacitor C7; the second terminal of resistor R34 is connected to the second terminal of resistor R32 and the first terminal of resistor R33. The first terminal of resistor R35 is connected to the cathode of the LED in optocoupler 316 through capacitor C9; the second terminal of resistor R35 is connected to the second terminal of resistor R34 and the first terminal of error amplifier D. The first terminal of capacitor C8 is connected to the cathode of the LED of optocoupler 316, the second terminal of capacitor C8 is connected to the first terminal of error amplifier D, the second terminal of error amplifier D is connected to the cathode of the LED of optocoupler 316, and the second terminal of error amplifier D is grounded.

[0042] In one embodiment, such as Figure 10 As shown, the isolation step-down module 31 of this application also includes a communication control unit 317. The communication control unit 317 is connected to the control unit 315 and transmits external adjustment signals to the control unit 315 so that the control unit 315 controls the isolation step-down unit 312 to output a power supply signal VG.

[0043] Specifically, the communication control unit 317 includes a communication interface 51, a communication circuit 52, and an output control circuit 53. The communication interface 51 receives external adjustment signals; the communication circuit 52 connects the communication interface 51 and the output control circuit 53, transmitting the external adjustment signals to the output control circuit 53; the output control circuit 53 connects to the control unit 315, generating adjustment commands based on the external adjustment signals, so that the control unit 315 controls the isolation step-down unit 312 to output power signals based on the adjustment commands.

[0044] Specifically, the communication interface 51 is, for example, a CAN bus interface, used to connect to a host system. The client can send external adjustment signals through the host system to adjust the power supply signal. The communication circuit 52 is used for level conversion, transmit / receive logic control, signal transmission, electrical isolation, and surge and electrostatic protection. Specifically, it converts the external adjustment signals received by the communication interface 51 into recognizable and processable signals and transmits them to the output control circuit 53. The output control circuit 53 adjusts the commands so that the control unit 315 controls the isolation step-down unit 312 to output the power supply signal based on the adjustment commands.

[0045] In one specific embodiment, taking the isolation step-down unit 312 as an LLC isolation step-down unit as an example, the external operation and maintenance backend sends an external adjustment signal through the communication interface 51. The external adjustment signal is transmitted to the output control circuit 53 through the communication circuit 52. The output control circuit 53 outputs a frequency adjustment signal to the resonant unit 3121 of the LLC isolation step-down unit 312 to change the operating frequency of the resonant unit 3121, so that the output voltage of the power supply signal VG can be continuously adjusted in the range of 3.0V to 5.0V. In one embodiment of this application, the display component includes a housing, an isolation step-down module 31 is disposed inside the housing, and a heat dissipation component is disposed inside the housing to adapt to the installation space of the display component housing.

[0046] The display module of this application uses a DC-DC isolated buck converter or an LLC isolated buck converter to convert high-voltage DC power, such as 400V, to low-voltage DC power, such as 3.0~5.0V, without the need for a two-stage buck converter. In the LLC isolated buck converter, the switching transistor achieves zero-voltage turn-on and zero-current turn-off under all operating conditions. Compared with forward and flyback hard-switching topologies, switching losses are significantly reduced. High conversion efficiency is maintained regardless of whether the screen is under high brightness and full load or under low brightness and light load at night, resulting in significant energy savings over long-term operation. Furthermore, the LLC isolated buck converter features smooth voltage and current switching during soft switching, and conducted and radiated EMI noise is much lower than that of hard-switching solutions. This can significantly reduce the amount of input and output filter capacitors and inductors, reduce the overall size of the module, lower material costs, and eliminate LED screen horizontal lines and flickering caused by electromagnetic interference.

[0047] By utilizing an LLC isolated step-down unit and matching the resonant network parameters with the isolation transformer turns ratio, a single-stage conversion can stably output a continuously adjustable low voltage of 3.0V~5.0V, specifically adapted to the driving requirements of outdoor LED display modules. No additional post-conversion circuitry is required, reducing fault points and power loss. The front-end input filter unit is optimized for 400V bus surges and common-mode interference. Optical isolation sampling achieves complete isolation between strong and weak currents. The LLC controller incorporates wide-temperature control logic, adaptable to outdoor high and low temperature environments (-40℃~70℃) and condensation environments.

[0048] Because of the addition of a communication control unit, it supports remote partition voltage adjustment in the background, and can dynamically match the output power according to the picture and lighting, further optimizing the energy-saving effect of the whole machine and adapting to the intelligent operation and maintenance screen.

[0049] See Figure 11 , Figure 11 This is a schematic diagram of the structure of an embodiment of the display device provided in this application. The display device 20 includes a plurality of display modules 30, which are arranged in an array and spliced ​​together to form a large-size display device. In this embodiment, the display module 30 includes the display module of any of the above embodiments.

[0050] In this embodiment, the isolation step-down module 31 of each display module 30 is connected to an output pin Pc of the three-phase power supply circuit 10 to receive the first DC signal Vdc1 through the output pin Pc.

[0051] In one embodiment, such as Figure 12 As shown, all the isolation step-down modules 31 are connected via the communication bus 120 and are also connected to the host system via the communication bus 120. The host system can simultaneously adjust the power supply signal VG of all display components 32 via the communication bus 120, or it can adjust only the power supply signal VG of some display components 32 to achieve independent brightness control of different areas.

[0052] See Figure 13 , Figure 13 A schematic diagram of an embodiment of the display system provided in this application includes: the display system of this application includes a three-phase power supply circuit 10 and a display device 20.

[0053] Specifically, the three-phase power supply circuit 10 is located in the distribution cabinet. The distribution cabinet is an outdoor waterproof primary distribution cabinet, located at the front end of the overall power supply, and serves as the centralized power distribution hub for the mains power connection to the large screen power system. The distribution cabinet has several output pins Pc that can output the first DC signal Vdc1.

[0054] The three-phase power supply circuit 10 includes a three-phase power module 11 and a busbar module 12. The three-phase power module 11 includes multiple three-phase power units 111. Figure 13It includes n three-phase power units (referred to as three-phase power units 1 to n). The input terminals of multiple three-phase power units 111 are connected in parallel and connected to the power receiving terminal to receive the three-phase input signal Vac. It should be noted that the three-phase input signal Vac is the effective value of the line voltage of the three-phase AC power.

[0055] The three-phase power unit 111 processes the three-phase input signal Vac and outputs a first DC signal Vdc1. The bus module 12 includes multiple input pins Pr and multiple output pins Pc. Each input pin Pr is connected to the output terminal of a three-phase power unit 111, and each output pin Pc is connected to a display module to power the display module using the first DC signal Vdc1.

[0056] The three-phase power supply circuit provided in this application embodiment is configured with a three-phase power unit 111 to convert the three-phase input signal Vac into a first DC signal Vdc and collect it in the busbar module 12. During subsequent power supply, the unified DC signal collected on the busbar module 12 is used to power the display module, which can ensure that the input of the display module is the unified DC signal on the busbar module 12, so as to solve the three-phase imbalance problem that occurs when the display device is connected to a three-phase AC power grid.

[0057] Specifically, bus module 12 is a busbar, with multiple input pins Pr connected in parallel inside the busbar, and multiple output pins Pc each independent. It should be noted that the busbar is a strip-shaped conductive conductor, serving as the common main conductive channel of the power distribution system. It is used to collect multiple electrical energy sources and distribute them uniformly to multiple branch loads, replacing the parallel wiring of multiple cables.

[0058] For the display device including multiple display modules in the embodiments of this application, each display module can draw power from the bus module 12 through the output pin Pc, so that the input of the display module is unified as the output of the bus module 12, and the three-phase imbalance problem is solved from the source in three-phase power supply.

[0059] In one embodiment, the three-phase power unit 111 is a three-phase PFC (Power Factor Correction) module, which is mainly used to perform sinusoidal correction, low-frequency harmonic suppression, three-phase current equalization and voltage regulation, and AC to high-voltage DC conversion on the three-phase input signal Vac.

[0060] In one embodiment, the display system further includes a communication component 40 connecting the three-phase power unit 111 and the isolated step-down module 31. The communication component 40 is used to communicate with the three-phase power unit 111 and the isolated step-down module 31.

[0061] In one embodiment, the communication component 40 includes a first communication circuit 41 and a second communication circuit 42. The first communication circuit 41 is connected to a first communication bus 110, and the second communication circuit 42 is connected to a second communication bus 120. The first communication circuit 41 and the second communication circuit 42 are respectively connected to a host system, and the host system communicates with the isolation step-down module 31 and the three-phase power unit 111 through the first communication circuit 41 and the second communication circuit 42.

[0062] The display system of this application includes an isolation step-down module in the display device, which is adapted to the power supply architecture of a three-phase power supply circuit. The isolation step-down module is used to step down the 400V high-voltage first DC signal output by the three-phase power supply circuit to obtain a low-voltage power supply signal of 3.0~5.0V to power the display components. This architecture can reduce long-distance transmission loss.

[0063] The above are merely embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A display module, characterized in that, The display module includes: an isolation step-down module and a display component; The input terminal of the isolation step-down module is used to connect to the output pin of the three-phase power supply circuit to receive a first DC signal, and to step down the first DC signal to output a power supply signal to power the display component; wherein, the three-phase power supply circuit is used to convert the three-phase input signal into the first DC signal, and the first DC signal is greater than a preset voltage value.

2. The display module according to claim 1, characterized in that, The isolation step-down module includes: An input filtering unit is used to connect to the output pin of the three-phase power supply circuit and to filter the first DC signal. An isolation step-down unit, connected to the input filter unit, is used to step down the first DC signal to obtain a power supply signal; An output filtering unit, connected to the isolation step-down unit, is used to filter the power supply signal and output it.

3. The display module according to claim 2, characterized in that, The isolation step-down module also includes: A sampling feedback unit, connected to the output filtering unit, is used to sample the power supply signal to obtain a first sampling signal; The control unit is connected to the sampling feedback unit and the isolation step-down unit, and is used to control the isolation step-down unit to output the power supply signal based on the first sampling signal.

4. The display module according to claim 3, characterized in that, The isolation step-down unit includes at least one of: a DC-DC isolation step-down unit and an LLC isolation step-down unit; The LLC isolated buck unit includes: The resonant unit is connected to the input filter unit; An isolation transformer, connecting the resonant unit and the output filter unit, is used to step down the first DC signal to obtain the power supply signal.

5. The display module according to claim 3, characterized in that, The isolation step-down module also includes: An optocoupler connects the sampling feedback unit and the control unit.

6. The display module according to claim 3, characterized in that, The isolation step-down module also includes: A communication control unit, connected to the control unit, is used to receive external adjustment signals and transmit the external adjustment signals to the control unit so that the control unit controls the isolation step-down unit to output the power supply signal.

7. The display module according to claim 6, characterized in that, The communication control unit includes: a communication interface, a communication circuit, and an output control circuit; The communication interface is used to receive the external adjustment signal; the communication circuit connects the communication interface and the output control circuit, and is used to transmit the external adjustment signal to the output control circuit; the output control circuit is connected to the control unit, and is used to generate an adjustment command based on the external adjustment signal, so that the control unit controls the isolation step-down unit to output the power supply signal based on the adjustment command.

8. The display module according to claim 1, characterized in that, The first DC signal is 320V~420V; the power supply signal is 3.0V~5.0V.

9. A display device, characterized in that, include: Multiple display modules are arranged in an array, and the display modules include the display modules described in any one of claims 1 to 8.

10. The display device according to claim 9, characterized in that, All the isolated step-down modules in the display modules are connected via a communication bus and are connected to the host system via the communication bus.

11. A display system, characterized in that, include: The three-phase power supply circuit includes a three-phase power module and a busbar module. The three-phase power module includes multiple three-phase power units, the input terminals of which are connected in parallel and connected to a power receiving terminal to receive three-phase input signals. The three-phase power units are used to process the three-phase input signals and output a first DC signal. The busbar module includes multiple input pins and multiple output pins, and each input pin is connected to the output terminal of one of the three-phase power units. The display device includes a plurality of display modules; the display modules include the display modules described in any one of claims 1 to 8. The input terminals of the isolation step-down modules in all the display modules are respectively connected to one of the output pins to receive the first DC signal, and to step down the first DC signal so as to output a power supply signal to power the display components.

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