CN220962765U - Power supply control circuit of LED display screen - Google Patents

Abstract

The utility model discloses a power supply control circuit of an LED display screen, which comprises: the control module is used for receiving control instructions of the upper computer and generating at least two relay control signals; the at least two relay modules are electrically connected with the control module and are used for receiving control signals of the control module; the at least two relay modules are respectively and electrically connected with the corresponding power supply control ends of the LED display screen and are used for respectively controlling the power supply of the corresponding controlled equipment according to the control signals. The technical scheme provided by the embodiment of the utility model realizes the remote control of at least two LED display screens, and reduces the manpower and labor capacity.

Description

Power supply control circuit of LED display screen

Technical Field

The utility model relates to the technical field of display screen control circuits, in particular to a power supply control circuit of an LED display screen.

Background

With the development of electrification, the outdoor LED display screen is increasingly widely applied.

At present, in the use scene of outdoor LED display screen, the distribution of LED display screen is scattered, when the LED display screen need turn on or turn off, generally need the manual work to carry out on-the-spot control, if the LED display screen quantity is great, need a large amount of manpower and materials, the management is difficult, extravagant a large amount of time.

Disclosure of utility model

The utility model provides a power supply control circuit of an LED display screen, which is used for realizing remote control of at least two LED display screens and reducing the labor amount.

According to an aspect of the present utility model, there is provided a power control circuit of an LED display screen,

Comprising the following steps:

At least two controlled LED display screens;

the control module is used for receiving control instructions of the upper computer and generating at least two relay control signals;

The at least two relay modules are electrically connected with the control module and are used for receiving relay control signals of the control module; the at least two relay modules are respectively and electrically connected with the corresponding power supply control ends of the LED display screen and are used for respectively controlling the power supply of the corresponding controlled equipment according to the control signals.

Optionally, the relay module includes:

The transistor switch unit is connected with the relay control signal and is turned on or turned off according to the relay control signal;

And a relay switching unit electrically connected to the transistor switching unit and having its contacts closed or opened in response to control of the transistor switching unit.

Optionally, the transistor switch unit includes:

The first end of the first resistor is connected with the relay control signal;

The first end of the second resistor is electrically connected with the second end of the first resistor, and the second end of the second resistor is grounded;

A first transistor, wherein a control electrode of the first transistor is electrically connected with a second end of the first resistor, a first electrode of the first transistor is grounded, and a second electrode of the first transistor is used as an output end of the transistor switch unit;

And/or, the relay switch unit includes:

The anode of the first diode is electrically connected with the output end of the transistor switch unit;

A third resistor, wherein a first end of the third resistor is electrically connected with the cathode of the first diode, and a second end of the third resistor is connected with a first power supply voltage;

The first end of the relay is electrically connected with the cathode of the first diode, the third end of the relay is electrically connected with the anode of the first diode, and the second end and the fourth end of the relay are used as output ends of the relay switch unit.

Optionally, the control module includes:

the singlechip chip comprises a debugging interface, a communication interface, a crystal oscillator interface, a power interface, a first indicator lamp control interface, at least two relay control interfaces and at least two second indicator lamp control interfaces; wherein, the signal of the said debug interface is outputted through the connector; the power interface is connected with a second power voltage;

The crystal oscillator comprises a crystal oscillator, a first capacitor and a second capacitor, wherein two ends of the crystal oscillator are respectively and electrically connected with corresponding interfaces of the crystal oscillator interface, a first end of the first capacitor is electrically connected with a first end of the crystal oscillator, and a second end of the first capacitor is grounded; the first end of the second capacitor is electrically connected with the first end of the crystal oscillator, and the second end of the second capacitor is grounded;

The first end of the third capacitor is connected to the second power supply voltage, and the second end of the third capacitor is grounded;

The fourth resistor and the first light emitting diode are connected in series between the second power supply voltage and the indicator lamp control interface.

Optionally, the power control circuit of the LED display screen further includes a power module, where the power module includes: the fuse, the voltage stabilizing chip and at least one fourth capacitor;

The fuse is connected in series between the power connector and the input end of the voltage stabilizing chip, and the at least one fourth capacitor is connected in parallel between the input end of the voltage stabilizing chip and the grounding end; the input end of the voltage stabilizing chip is a first power supply voltage, and the output end of the voltage stabilizing chip is a second power supply voltage.

Optionally, the power control circuit of the LED display screen further includes:

the first communication end of the communication module is connected with the control instruction of the upper computer through a connector; the communication module processes the control instruction, and the second communication end of the communication module is electrically connected with the communication interface of the singlechip chip.

Optionally, the communication interface includes an RS485 communication interface and a UART communication interface; the communication module includes:

The input end of the RS485 communication unit receives the upper instruction of the upper computer, the output end of the RS485 communication unit is electrically connected with the output end of the singlechip chip,

And the UART communication unit is electrically connected with the output end of the singlechip chip.

Optionally, the power control circuit of the LED display screen further includes: at least two relay indication modules;

The at least two relay indicating modules are electrically connected with the control module and are used for receiving control signals of the control module; the at least two relay indicating modules comprise LED indicating lamps, each relay indicating module corresponds to one relay module, and the LED indicating lamps with different colors respectively correspond to the opening and closing states of the relay modules.

Optionally, the control device includes: LED display screen control card, central control equipment or video processor; the control equipment is used for receiving the control instruction of the upper computer and forwarding the control instruction to the control module.

According to the power supply control circuit of the LED display screen, the control module, the relay modules and the LED display screen modules are arranged, at least two relay modules are electrically connected with the control module, and at least two relay modules are electrically connected with the power supply control ends of the corresponding LED display screen respectively. The power supply control circuit of the LED display screen achieves the effect that the upper computer sends out control commands to remotely control at least two LED screens. The upper computer sends a control instruction to the control equipment, the control instruction is forwarded to the control module by the control equipment, and control signals corresponding to the at least two relay modules are generated, so that the control of the at least two relay modules can be realized, the on-off control of the at least two LED display screens is realized, the on-site operation is not needed, the manpower and the time are saved, and the automatic control of the at least two LED display screens is realized.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the utility model or to delineate the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a power control circuit for an LED display screen according to the present utility model;

FIG. 2 is a circuit diagram of a control module provided in accordance with the present utility model;

fig. 3 is a circuit diagram of a relay module provided in accordance with the present utility model;

FIG. 4 is a circuit diagram of a power module according to the present utility model;

fig. 5 is a circuit diagram of a communication module provided in accordance with the present utility model;

fig. 6 is a circuit diagram of a relay indicating module provided by the utility model.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The embodiment of the invention provides a power supply control circuit of an LED display screen, which is suitable for various scenes such as an outdoor LED screen, a lamp post screen, a road sign and the like.

Fig. 1 is a schematic diagram of a power control circuit of an LED display screen according to the present utility model, referring to fig. 1, the power control circuit of the LED display screen includes: at least two controlled LED display screens 4, a control module 2 and at least two relay modules 3. The control module 2 is configured to receive a control instruction of the host computer 1, and generate at least two relay control signals, for example, a relay control signal SW1, a relay control signal SW2, a relay control signal SW3, and the like. At least two relay modules 3 are electrically connected with the control module 2 and are used for receiving relay control signals of the control module 2. The at least two relay modules 3 are respectively and electrically connected with the power supply control ends of the corresponding LED display screens 4 and are used for respectively controlling the power supply of the corresponding controlled equipment according to the control signals.

Specifically, the upper computer 1 is a computer that the system can directly issue a control command, and the upper computer 1 provides a user operation interaction interface and intuitively displays feedback data to a user. The upper computer 1 can also customize various control commands, such as a timing switch function.

The principle of the power supply control circuit of the LED display screen controlling the LED display screens is that the switching instruction sent by the host computer 1 is received by the control device 6, the control device 6 forwards the switching instruction to the relay master control module 23, the control module 2 of the relay master control module 23 receives the control signal, and the control module 2 interprets the control signal into corresponding time sequence signals according to the command to directly control n (n is greater than or equal to 2) relay modules 3, so as to realize the on and off of the corresponding relay modules 3. The control module 2 sends out relay control signals SW1 and SW2 … SWn, which are respectively received by the n relay modules 3, so as to control the on-off of the n relay modules 3. Each relay module 3 corresponds to one LED display screen 4 respectively, and n relay modules 3 correspond to n LED display screens 4. The relay module 3 is connected to the power supply circuit of the display module 54, and the relay module 3 controls the power supply of the LED display screen 4 by controlling the control end of the total electric ac contactor in the LED display screen power distribution cabinet 5. The relay control signals SW1 and SW2 … SWn sent by the control module 2 may be the same or different, that is, each LED screen may be turned on and off at the same time, and the control mode is flexible and may be controlled as required.

Therefore, according to the power supply control circuit of the LED display screen, provided by the embodiment of the utility model, the control module 2, the relay modules 3 and the LED display screen module 4 are arranged, at least two relay modules 3 are electrically connected with the control module 2, and at least two relay modules 3 are electrically connected with the power supply control ends of the corresponding LED display screen 4 respectively. The power supply control circuit of the LED display screen achieves the effect that the upper computer 1 sends out a control command to remotely control at least two LED screens. Specifically, the upper computer 1 sends a control instruction to the control device 6, the control instruction is forwarded to the control module 2 by the control device 6, and control signals corresponding to the at least two relay modules 3 are generated, so that the control of the at least two relay modules 3 can be realized, the control of opening and closing of the at least two LED display screens 4 is realized, on-site operation is not needed, manpower and time are saved, and automatic control of the at least two LED display screens is realized.

In the above embodiments, the arrangement modes of the modules are various, and the following is a specific description of the arrangement modes of the modules according to the embodiment of the present utility model.

Fig. 2 is a circuit diagram of a control module according to the present utility model, referring to fig. 2, and optionally, based on the above embodiments, the control module 2 includes a single chip 210, a crystal oscillator Y1, a first capacitor C5, a second capacitor C6, at least one third capacitor (illustratively, including capacitors C1, C2, C3 and C4), a fourth resistor R2 and a first light emitting diode RUN1 LED.

With continued reference to FIG. 2, the model of the single chip microcomputer chip 210 is STM32F105RBT6, which includes 64 pins. The system further comprises a debugging interface 2101, a communication interface 2102, a crystal oscillator interface 2103, a power interface 2104, a first indicator light control interface 2105, at least two relay control interfaces 2106 and at least two second indicator light control interfaces 2107; the signal of the debug interface 2101 is output through a connector, and the power interface 2104 is connected to a second power voltage.

The two ends of the crystal oscillator Y1 are respectively and electrically connected with corresponding interfaces of the crystal oscillator Y1 interface, the first end of the first capacitor C5 is electrically connected with the first end of the crystal oscillator Y1, the second end of the first capacitor C5 is grounded, the first end of the second capacitor C6 is electrically connected with the first end of the crystal oscillator Y1, and the second end of the second capacitor C6 is grounded. The first end of the third capacitor is connected to the second power voltage, and the second end of the third capacitor is grounded. The fourth resistor R2 and the first light emitting diode RUN1 LED are connected in series between the second power supply voltage and the control interface of the indicator lamp.

Specifically, the debug interface 2101 of the singlechip chip 210 is connected with an external plug-in to realize a debug function. The single chip microcomputer chip 210 sends communication signals TXD1, RXD1 and 485DIR through the pins 29, 30 and 39, and the communication interface 2102 receives the communication signals to realize line-to-line communication. The singlechip chip 210 sends a communication signal TXD0 and a communication signal RXD0 through the pins 51 and 52, and the communication interface 2102 receives the communication signals between lines. The singlechip chip 210 sends OUT a crystal oscillator signal OSC_IN and a crystal oscillator signal OSC_OUT through the pin 5 and the pin 6, and the crystal oscillator interface 2103 receives the crystal oscillator signal OSC_IN and the crystal oscillator signal OSC_OUT to realize communication with the crystal oscillator Y1. The power interface 2104VDD is connected to the second power supply voltage VDD via pin 1, pin 32, pin 48, pin 64, pin 19, and pin 13, thereby realizing power supply. The singlechip chip 210 sends a first indicator lamp control signal ILED through the pin 40, and the first indicator lamp control signal ILED is received by the first indicator lamp control interface 2105 to realize communication with the first indicator lamp. The single chip microcomputer chip 210 sends out relay control signals SW1 and SW2 … SW6 through the pin 14, the pin 16, the pin 20, the pin 33, the pin 35 and the pin 37, and the at least two relay control interfaces 2106 receive the signals to realize communication with the relay module 3. The singlechip chip 210 sends out second indicator lamp control signals L1 and L2 … L6 through the pins 22, 17, 21, 34, 36 and 38, and the second indicator lamp control interface 2107 receives the second indicator lamp control signals to realize communication with the second indicator lamp. Illustratively, the debug interface 2101 may be used for debugging the single chip microcomputer chip 210. The communication interface 2102 can be used for communication between the single chip microcomputer chip 210 and the upper computer 1, so that the single chip microcomputer chip 210 can timely receive a control instruction issued by the upper computer 1. The crystal oscillator interface 2103 can provide clock signals for the singlechip of the singlechip chip 210, so that the normal operation of the singlechip chip 210 is ensured. The power interface 2104 provides power for the operation of the single chip microcomputer chip 210. The first indicator light control interface 2105 is used for indicating the running state of the single chip microcomputer chip 210, and the lamp is turned on when running and turned off when being turned off. At least two relay control interfaces 2106 may be used to control the opening and closing of the relay module 3. At least two second indicator light control interfaces 2107 indicate the on-off state of the relay module 3 by indicator lights of different colors.

The control module 2 indirectly receives the control command sent by the upper computer 1, and distributes the control command sent by the upper computer 1 through an interface on the singlechip chip 210, so that the control of the relay module 3 is realized. Meanwhile, the second indicator lamp displays the on-off of the relay module 3 in real time through the indicator lamps with different colors, so that the relay is convenient and visual.

Fig. 3 is a circuit diagram of a relay module provided by the utility model. Referring to fig. 3, optionally, on the basis of the above embodiments, the relay module 3 includes: a transistor switching unit 310 and a relay switching unit 320, the transistor switching unit 310 being connected to the relay control signal SW1 and being turned on or off according to the relay control signal; the relay switching unit 320 is electrically connected to the transistor switching unit 310 and closes or opens contacts thereof in response to control of the transistor switching unit 310.

With continued reference to fig. 3, the transistor switch unit 310 may optionally include: the first resistor R18, the second resistor R21 and the first transistor Q1 are connected with the relay control signal SW1 at the first end of the first resistor R18; the first end of the second resistor R21 is electrically connected with the second end of the first resistor R18, and the second end of the second resistor R21 is grounded; the control electrode of the first transistor Q1 is electrically connected to the second end of the first resistor R18, the first electrode of the first transistor Q1 is grounded, and the second electrode of the first transistor Q1 serves as the output end of the transistor switching unit 310.

With continued reference to fig. 3, optionally, the relay switch unit 320 includes: the first diode D1, the third resistor R15 and the relay S1, the anode of the first diode D1 is electrically connected with the output terminal of the transistor switching unit 310; the first end of the third resistor R15 is electrically connected with the cathode of the first diode D1, and the second end of the third resistor R15 is connected with the first power supply voltage; the relay S1 includes 5 pins. The first terminal of the relay S1 is electrically connected to the cathode of the first diode D1, the third terminal of the relay S1 is electrically connected to the anode of the first diode D1, and the second and fourth terminals of the relay S1 serve as output terminals of the relay switching unit 320.

Specifically, the relay S1 is an electric switching device that controls switching of a circuit by electromagnetic force. The working principle of the relay S1 is mainly to control the switch of a circuit by utilizing the attractive force and the release force of an electromagnet. Illustratively, when a certain current is passed through the circuit of the relay module 3, the electromagnet will generate a magnetic field that attracts the contacts in the relay 3, causing their normally open contacts to close. In this closed state, the current in the circuit can flow through the contacts of the relay S1, thus realizing the corresponding control function. When the current in the circuit stops, the magnetic field of the electromagnet disappears, the normally open contact can be restored to the original open state, and the current in the circuit can be cut off.

The first resistor R18, the second resistor R21 and the third resistor R15 can play a role of current limiting so as to protect the relay module 3 and other electronic components from excessive current impact; in addition, the first resistor R18, the second resistor R21 and the third resistor R15 may also perform a voltage dividing function to divide the high-voltage electrical signal into the low-voltage electrical signal, so as to adapt to the operating voltage range of the relay S1. The first diode D1 has unidirectional conductivity and can be used for rectifying, stabilizing voltage and isolating reverse electricity. The relay control signal SW1 is transmitted to the control electrode of the first transistor Q1, and when the level is low, the first transistor Q1 is turned off, and the relay S1 is not operated. When the voltage is at the high level, the first transistor Q1 is turned on, the relay control signal SW1 is transmitted to the pin 3 of the relay S1, the relay S1 operates, the pin 4 of the relay S1 outputs a signal, and the pin 1 of the plug-in unit K1 receives a signal.

The relay module 3 has fast action response and quick response, can realize the opening and closing of the LED display screen 4, and in addition, the relay module 3 is arranged in such a way, and has simple structure, stability, reliability and easy realization.

Fig. 4 is a circuit diagram of a power module according to the present utility model, referring to fig. 4, and optionally, on the basis of the above embodiments, the power control circuit of the LED display screen 4 further includes a power module, where the power module includes: fuse F1, voltage regulator chip 410, and at least one fourth capacitor (illustratively, comprising capacitors CE1, C7, C8, and C9); the fuse F1 is connected in series between the power connector and the input end of the voltage stabilizing chip 410, and the at least one fourth capacitor is connected in parallel between the input end of the voltage stabilizing chip 410 and the ground end; the input end of the voltage stabilizing chip 410 is a first power voltage, and the output end of the voltage stabilizing chip 410 is a second power voltage.

Specifically, the fuse F1 is the front end protection of the power module, and can be fused immediately when the circuit breaks down, so that the failure is prevented from damaging the power control circuit of the LED display screen. The fourth capacitor is a voltage stabilizing capacitor, and the output voltage is smoothed by separating the direct current signal and filtering the alternating current signal. First, the regulated capacitor can absorb and store charge, releasing charge when needed to reduce voltage variations. Second, the capacitor can store energy, and can rapidly release electric energy to maintain the stability of the circuit when the power supply voltage instantaneously changes or flashes. The voltage stabilizing chip 410 can be AMS1117-3.3, and the capacitors C11 and C12 are connected between the voltage stabilizing chip and the ground terminal, wherein the AMS1117-3.3 comprises 4 pins, and is a forward low-voltage-drop voltage stabilizer capable of converting 5V input voltage into 3.3V output voltage, and can be used for power supply management. The power supply module supplies power to the power supply control circuit of the LED display screen, so that the safety and the power supply reliability of the power supply control circuit of the LED display screen are ensured, the voltage and the current are more stably input, and the long-term operation of the power supply control circuit of the LED display screen is ensured.

Fig. 5 is a circuit diagram of a communication module provided by the present utility model, referring to fig. 5, and on the basis of the foregoing embodiments, optionally, the power control circuit of the LED display screen further includes a communication module, where a first communication end of the communication module is connected to a control instruction of the host computer 1 through a connector. The second communication end of the communication module is electrically connected with the communication interface of the single chip microcomputer chip 210. The communication module can process the control command and transmit the control command with the single chip microcomputer chip 210. The communication interface comprises an RS485 communication interface and a UART communication interface. The communication module includes: an RS485 communication unit 510 and a UART communication unit 520. The RS485 communication unit 510 comprises 8 pins, the input end of the RS485 communication unit 510 receives an upper instruction of the upper computer 1, and the output end of the RS485 communication unit is electrically connected with the output end of the singlechip chip 210. The UART communication unit 520 includes 4 pins, and the UART communication unit 520 is electrically connected to an output end of the single chip microcomputer 210.

Specifically, the RS485 communication unit 510 is installed by plugging in a connector, the input end of the RS485 communication unit 510 is connected with the upper computer 1, the output end is connected with the single-chip microcomputer chip 210, the control instruction of the upper computer 1 can be transmitted into the single-chip microcomputer chip 210, and the UART communication unit 520 is directly connected with the single-chip microcomputer chip 210. The communication module may be an RS485 communication unit 510 or a UART communication unit 520. The transmission rate of the RS485 communication unit 510 can reach 10Mbit/s, the anti-interference capability is good, and the theoretical communication distance can reach 1200 meters. The UART communication unit 520 is a universal serial data bus for asynchronous communication. The bus is used for bidirectional communication, full duplex transmission and receiving can be realized, and the communication distance is relatively short, generally about 1 meter. The power control circuit of the LED display screen may select the RS485 communication unit 510 or the UART communication unit 520 according to the transmission distance.

The communication module realizes the data communication between the upper computer 1 and the singlechip chip 210, and realizes the indirect control of the upper computer 1 on the relay module 3, thereby realizing the control of the power supply of the LED display screen 4.

Fig. 6 is a circuit diagram of a relay indicating module provided by the present utility model, referring to fig. 6, and optionally, the power control circuit of the LED display screen 4 further includes at least two relay indicating modules 6 based on the above embodiments. The at least two relay indicating modules 6 are electrically connected with the control module 2 and are used for receiving a second indicating lamp control signal L1 of the control module 2; each relay indicating module 6 corresponds to one relay module 3, and n relay indicating modules 6 correspond to n relay modules 3. Each relay indicating module 6 comprises two LED indicating lamps, the two LED indicating lamps can be red lamps and green lamps respectively according to the opening and closing states of the relay module 3, the red lamps indicate that the relay module 3 is opened, and the green lamps indicate that the relay module 3 is closed.

Specifically, the control module 2 sends out the relay control signals SW1, SW2 … SWn and also sends out the second indicator lamp control signals L1, L2 … Ln to the relay indicating module 6, and the relay indicating module 6 displays the on-off state of the relay module 3 through the LED indicator lamps with different colors, for example, when the relay module 3 is turned off, the relay indicating module lights up a red light, and when the relay module 3 is turned on, the relay indicating module 6 lights up a green light. The real-time state of the relay module 3 can be more intuitively reflected by the relay indicating module 6.

Optionally, the control device provided by the embodiment of the present utility model includes: LED display screen control card, central control equipment or video processor; the control equipment is used for receiving the control instruction of the upper computer and forwarding the control instruction to the control module.

Specifically, the LED display screen control card, the central control device or the video processor are respectively applied to different places. The LED display screen control card is mainly used for places such as small-screen LED display screens, highway signs, lamp post screens and the like. The central control equipment is mainly used in meeting rooms, exhibition halls and other places, and can control equipment such as sound equipment, lamplight, microphones and the like while realizing control of the LED display screen. The video processor is mainly used for places such as large-screen LED display screens, large-scale meeting rooms, concerts and the like. The multi-scene can be controlled through different upper computers 1, and various expansion purposes of the LED display screen power supply control circuit are realized.

It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present utility model may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present utility model are achieved, and the present utility model is not limited herein.

The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.

Claims (9)

1. A power control circuit for an LED display screen, comprising:

At least two controlled LED display screens;

the control module is used for receiving control instructions of the upper computer and generating at least two relay control signals;

The at least two relay modules are electrically connected with the control module and are used for receiving relay control signals of the control module; the at least two relay modules are respectively and electrically connected with the corresponding power supply control ends of the LED display screen and are used for respectively controlling the power supply of the corresponding controlled equipment according to the control signals.

2. The power control circuit of an LED display of claim 1, wherein the relay module comprises:

The transistor switch unit is connected with the relay control signal and is turned on or turned off according to the relay control signal;

And a relay switching unit electrically connected to the transistor switching unit and having its contacts closed or opened in response to control of the transistor switching unit.

3. The power control circuit of an LED display of claim 2, wherein the transistor switching unit comprises:

The first end of the first resistor is connected with the relay control signal;

The first end of the second resistor is electrically connected with the second end of the first resistor, and the second end of the second resistor is grounded;

A first transistor, wherein a control electrode of the first transistor is electrically connected with a second end of the first resistor, a first electrode of the first transistor is grounded, and a second electrode of the first transistor is used as an output end of the transistor switch unit;

And/or, the relay switch unit includes:

The anode of the first diode is electrically connected with the output end of the transistor switch unit;

A third resistor, wherein a first end of the third resistor is electrically connected with the cathode of the first diode, and a second end of the third resistor is connected with a first power supply voltage;

The first end of the relay is electrically connected with the cathode of the first diode, the third end of the relay is electrically connected with the anode of the first diode, and the second end and the fourth end of the relay are used as output ends of the relay switch unit.

4. The power control circuit of an LED display of claim 1, wherein the control module comprises:

the singlechip chip comprises a debugging interface, a communication interface, a crystal oscillator interface, a power interface, a first indicator lamp control interface, at least two relay control interfaces and at least two second indicator lamp control interfaces; wherein, the signal of the said debug interface is outputted through the connector; the power interface is connected with a second power voltage;

The crystal oscillator comprises a crystal oscillator, a first capacitor and a second capacitor, wherein two ends of the crystal oscillator are respectively and electrically connected with corresponding interfaces of the crystal oscillator interface, a first end of the first capacitor is electrically connected with a first end of the crystal oscillator, and a second end of the first capacitor is grounded; the first end of the second capacitor is electrically connected with the first end of the crystal oscillator, and the second end of the second capacitor is grounded;

The first end of the third capacitor is connected to the second power supply voltage, and the second end of the third capacitor is grounded;

The fourth resistor and the first light emitting diode are connected in series between the second power supply voltage and the indicator lamp control interface.

5. The power control circuit of an LED display screen of claim 4, further comprising a power module comprising: the fuse, the voltage stabilizing chip and at least one fourth capacitor;

The fuse is connected in series between the power connector and the input end of the voltage stabilizing chip, and the at least one fourth capacitor is connected in parallel between the input end of the voltage stabilizing chip and the grounding end; the input end of the voltage stabilizing chip is a first power supply voltage, and the output end of the voltage stabilizing chip is a second power supply voltage.

6. The power control circuit of an LED display screen of claim 4, further comprising:

the first communication end of the communication module is connected with the control instruction of the upper computer through a connector; the communication module processes the control instruction, and the second communication end of the communication module is electrically connected with the communication interface of the singlechip chip.

7. The power control circuit of an LED display of claim 6, wherein said communication interface comprises an RS485 communication interface and a UART communication interface; the communication module includes:

The input end of the RS485 communication unit receives the upper instruction of the upper computer, the output end of the RS485 communication unit is electrically connected with the output end of the singlechip chip,

And the UART communication unit is electrically connected with the output end of the singlechip chip.

8. The power control circuit of an LED display screen of claim 4, further comprising: at least two relay indication modules;

The at least two relay indicating modules are electrically connected with the control module and are used for receiving control signals of the control module; the at least two relay indicating modules comprise LED indicating lamps, each relay indicating module corresponds to one relay module, and the LED indicating lamps with different colors respectively correspond to the opening and closing states of the relay modules.

9. The power control circuit of an LED display screen of claim 1, comprising a control device comprising: LED display screen control card, central control equipment or video processor; the control equipment is used for receiving the control instruction of the upper computer and forwarding the control instruction to the control module.