CN215185985U - Intelligent charge and discharge control system for solar LED screen - Google Patents

Intelligent charge and discharge control system for solar LED screen Download PDF

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CN215185985U
CN215185985U CN202121441708.2U CN202121441708U CN215185985U CN 215185985 U CN215185985 U CN 215185985U CN 202121441708 U CN202121441708 U CN 202121441708U CN 215185985 U CN215185985 U CN 215185985U
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storage battery
control switch
bat
diode
mos
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欧阳小芳
王路
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Shangqiu Normal University
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

The utility model provides an intelligent charge-discharge control system of solar energy LED screen for solve the battery because of last constant voltage charge-discharge lead to its life-span shorten and LED screen system in the group battery because of the technical problem such as panel polarization, energy loss that long-time discharge produced. The utility model comprises a solar cell panel, an LED display screen and at least two groups of storage batteries, wherein the two groups of storage batteries are a first storage battery and a second storage battery respectively, and the first storage battery and the second storage battery are connected in parallel; the first storage battery and the second storage battery are connected with the solar cell panel through the charging control switch and connected with the LED display screen through the discharging control switch; the charging control switch and the discharging control switch are both connected with a control module. The utility model discloses a parallelly connected storage battery of "1 + 1" replaces singly organizing the battery with the capacity, improves the reliability and the stability of the maximum utilization ratio of solar cell square matrix and photovoltaic system equipment, reduces energy loss, extension battery life, reduce cost.

Description

Intelligent charge and discharge control system for solar LED screen
Technical Field
The utility model relates to a battery charge-discharge control technical field, concretely relates to intelligent charge-discharge control system of solar energy LED screen.
Background
Photovoltaic power generation has been rapidly developed as an important distributed power technology, and the number of independent or grid-connected photovoltaic power stations and the capacity of the independent or grid-connected photovoltaic power stations are increasing. A photovoltaic power generation system is generally composed of components such as a solar cell, a storage battery, a controller, and an electrical load. The solar cell absorbs the radiation energy of sunshine, converts the solar energy into electric energy and provides a power supply for the system. At present, most of photovoltaic systems are charged by adopting single-group storage battery constant-voltage charging control, the control circuit is simple in structure, low in price and wide in application at home and abroad, but the storage battery plate is polarized due to long-time charging, so that the storage battery is serious in energy loss and short in service life, and some storage batteries are scrapped for only one or two years. The conventional LED controller does not consider the fluctuation of the LED current caused by the large change of the voltage of the storage battery, so that the overcurrent of the LED is easily caused, and the service life of the LED is shortened; the conventional constant current controller also performs voltage stabilization and constant current control on the load LED all the time, so that the capacity of the storage battery is quickly lost when the voltage of the storage battery is lower, and the service life of the storage battery is shortened.
SUMMERY OF THE UTILITY MODEL
To not enough among the above-mentioned background art, the utility model provides an intelligent charge-discharge control system of solar energy LED screen adopts "1 + 1" parallelly connected storage battery to replace singly organizing the battery with capacity to utilize intelligent complementary control circuit that charges to carry out the alternate charging to storage battery, solved the battery because of last constant voltage charge-discharge lead to its life-span shorten and LED screen system in the battery because of the panel polarization, the energy loss problem that long-time discharge produced.
In order to solve the technical problem, the utility model discloses a following technical scheme: an intelligent charge and discharge control system for a solar LED screen comprises a solar cell panel, an LED display screen and at least two groups of storage batteries, wherein the two groups of storage batteries are a first storage battery and a second storage battery respectively, and the first storage battery and the second storage battery are connected in parallel; the first storage battery and the second storage battery are connected with the solar cell panel through the charging control switch, and the first storage battery and the second storage battery are connected with the LED display screen through the discharging control switch; and the charging control switch and the discharging control switch are connected with the control module.
The charging control switch comprises a first control switch and a second control switch, the first control switch is respectively connected with the solar panel, the first storage battery and the control module, and the second control switch is respectively connected with the solar panel, the second storage battery and the control module; the discharge control switch comprises a third control switch and a fourth control switch, the third control switch is respectively connected with the LED display screen, the first storage battery and the control module, and the fourth control switch is respectively connected with the LED display screen, the second storage battery and the control module.
The first control switch is a first MOS tube, a source electrode of the first MOS tube is connected with the solar cell panel through a first diode, a drain electrode of the first MOS tube is connected with a negative electrode of the first storage battery, and a grid electrode of the first MOS tube is connected with the control module.
The second control switch is a second MOS tube, the source electrode of the second MOS tube is connected with the solar cell panel through a fourth diode, the drain electrode of the second MOS tube is connected with the negative electrode of the second storage battery, and the grid electrode of the second MOS tube is connected with the control module.
The third control switch is a third MOS tube, the source electrode of the third MOS tube is connected with the negative electrode of the first storage battery, the drain electrode of the third MOS tube is connected with the LED display screen, and the grid electrode of the third MOS tube is connected with the control module.
The fourth control switch is a fourth MOS tube, the source electrode of the fourth MOS tube is connected with the negative electrode of the second storage battery, the drain electrode of the fourth MOS tube is connected with the LED display screen, and the grid electrode of the fourth MOS tube is connected with the control module.
The LED display screen is characterized in that a first voltage detection module is connected between the first MOS tube and the first diode in series, a second voltage detection module is connected between the second MOS tube and the fourth diode in series, a third voltage detection module is connected between the third MOS tube and the LED display screen in series, and a fourth voltage detection module is connected between the fourth MOS tube and the LED display screen in series.
A first relay is connected between the grid of the first MOS tube and the control module in series, and a normally open contact of the first relay is connected between the first diode and the solar panel in series; a second relay is connected between the grid of the second MOS tube and the control module in series, and a normally open contact of the second relay is connected between the fourth diode and the solar panel in series; a third relay is connected between the grid of the third MOS tube and the control module in series, and a normally open contact of the third relay is connected between the third voltage detection module and the LED display screen in series; and a fourth relay is connected between the grid of the fourth MOS tube and the control module in series, and a normally open contact of the fourth relay is connected between the fourth voltage detection module and the LED display screen in series.
A second diode is connected in parallel between the source electrode and the drain electrode of the first MOS tube, and two ends of the second diode are respectively connected with the first voltage detection module and the first storage battery; a fifth diode is connected in parallel between the source and the drain of the second MOS transistor, and two ends of the fifth diode are respectively connected with the second voltage detection module and the second storage battery; a third diode is connected in parallel between the source and the drain of the third MOS transistor, and two ends of the third diode are respectively connected with the third voltage detection module and the first storage battery; and a sixth diode is connected in parallel between the source and the drain of the fourth MOS transistor, and two ends of the sixth diode are respectively connected with the fourth voltage detection module and the second storage battery.
The utility model adopts the 1+1 parallel storage battery to replace the single group storage battery with the same capacity, and utilizes the intelligent charging complementary control circuit to detect the working state of the terminal voltage of the storage battery to automatically close and open, and the storage battery adopts the constant voltage pulse mode to carry out alternate charging, thereby not only eliminating the problem that the service life of the storage battery is short due to the continuous constant voltage charging and discharging, but also eliminating the problems of polarization of the battery panel, energy loss and the like caused by long-time discharging of the single group battery in the LED screen system; the maximum utilization rate of the solar cell array is improved, the reliability and the stability of the photovoltaic system equipment are improved, meanwhile, the energy loss can be reduced, the service life of a storage battery is prolonged, and the cost of the photovoltaic system is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a control schematic diagram of the present invention;
FIG. 2 is a circuit diagram of the present invention;
fig. 3 shows the change of the state of charge of the storage battery according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.
The utility model provides an intelligent charge-discharge control system of solar energy LED screen, including solar cell panel, LED display screen and at least two sets of batteries, two sets of batteries are first battery BAT1 and second battery BAT2 respectively, first battery BAT1 and second battery BAT2 parallel connection. Specifically, the anodes of the first storage battery BAT1 and the second storage battery BAT2 are connected with the LED display screen and are all grounded, the first storage battery BAT1 and the second storage battery BAT2 are connected with the solar cell panel through the charging control switch, the first storage battery BAT1 and the second storage battery BAT2 are connected with the LED display screen through the discharging control switch, namely, when the charging control switch is turned on, the solar cell panel charges the storage battery, and when the discharging control switch is turned on, the storage battery discharges the LED display screen. The charging control switch and the discharging control switch are both connected with the control module, and the control module is grounded. In the embodiment, the conventional constant-current control module is optimized to realize the constant-current control of the load LED display screen when the voltage of the storage battery is enough, and realize the non-constant-current control when the voltage of the storage battery is lower.
The specific control principle block diagram is shown in figure 1, the controlled object MOSFET corresponds to a charge control switch or a discharge control switch, and is according to the magnitude of the storage battery voltage Ui and U' -K in figure 11Curve adjusting the integral coefficient K appropriately1The voltage U at two ends of the load LED can be changed by reasonably setting the output duty ratio y0To be equal to the given value U' to achieve the desired effect. Namely, when the storage battery voltage Ui is lower, the non-constant current control is realized for the load. By applying the integral coefficient K according to the curve law shown in FIG. 11The attenuation is gradually reduced to 0, so that smooth transition from no-difference control to poor control can be well realized, and non-constant current control on the load is realized.
The charging control switch comprises a first control switch and a second control switch, the first control switch is respectively connected with the solar cell panel, the first storage battery BAT1 and the control module, and the second control switch is respectively connected with the solar cell panel, the second storage battery BAT2 and the control module. The control module can realize that the solar panel charges the first storage battery BAT1 or the second storage battery BAT2 by controlling the first control switch or the second control switch to be switched on. The discharging control switch comprises a third control switch and a fourth control switch, the third control switch is respectively connected with the LED display screen, the first storage battery BAT1 and the control module, and the fourth control switch is respectively connected with the LED display screen, the second storage battery BAT2 and the control module. Similarly, the control module can realize that the first storage battery BAT1 or the second storage battery BAT2 discharges to the LED display screen by controlling the third control switch or the fourth control switch to be turned on.
As shown in fig. 2, the first control switch is a first MOS transistor T1, a source of the first MOS transistor T1 is connected to the solar cell panel through a first diode D1, an anode of the first diode D1 is connected to a source of the first MOS transistor T1, and a cathode of the first diode D1 is connected to the solar cell panel. The drain of the first MOS transistor T1 is connected to the negative electrode of the first battery BAT1, and the gate of the first MOS transistor T1 is connected to the control module. The third control switch is a third MOS transistor T3, the source of the third MOS transistor T3 is connected to the negative electrode of the first battery BAT1, the drain of the third MOS transistor T3 is connected to the LED display screen, and the gate of the third MOS transistor T3 is connected to the control module. The structure realizes that when the first MOS transistor T1 is switched on and the third MOS transistor T3 is switched off, the solar panel charges the first storage battery BAT 1; when the first MOS transistor T1 is turned off and the third MOS transistor T3 is turned on, the first battery BAT1 discharges to the LED display screen. The second control switch is a second MOS transistor T2, the source of the second MOS transistor T2 is connected to the solar panel through a fourth diode D4, the anode of the fourth diode D4 is connected to the source of the second MOS transistor T2, and the cathode of the fourth diode D4 is connected to the solar panel. The drain electrode of the second MOS tube T2 is connected with the negative electrode of the second storage battery BAT2, and the grid electrode of the second MOS tube T2 is connected with the control module; the fourth control switch is a fourth MOS transistor T4, the source of the fourth MOS transistor T4 is connected to the negative electrode of the second battery BAT2, the drain of the fourth MOS transistor T4 is connected to the LED display screen, and the gate of the fourth MOS transistor T4 is connected to the control module. The structure realizes that when the second MOS transistor T2 is switched on and the fourth MOS transistor T4 is switched off, the solar panel charges the second storage battery BAT 2; when the second MOS transistor T2 is turned off and the fourth MOS transistor T4 is turned on, the second battery BAT2 discharges to the LED display screen. The corresponding charge-discharge duty cycle is shown in table 1:
Figure DEST_PATH_IMAGE002
therefore, in a charging and discharging period, a complementary control system is formed by controlling the charging of one group of storage batteries and the discharging of the other group of storage batteries, and the constant current control of the LED display screen is realized by stabilizing the voltage of the load by utilizing the PWM technology. If the storage battery is under-voltage in a continuous rainy day, the control module detects the storage battery, in order to guarantee uninterrupted power supply of the load equipment and avoid damage of over-discharge of the storage battery, the control module controls the solar battery to charge only one group of storage batteries, the voltage of the single group of storage batteries can be increased as soon as possible, and output power supply of the load is guaranteed. In this embodiment, the control module adopts a single chip microcomputer of a PIC16F716 model, and the PIC16F716 single chip microcomputer adopts a PIC16F71 single chip microcomputer produced by Microchip company as a core control device. Through the detection and judgment of terminal voltage, environment temperature and other parameters of the first storage battery BAT1 and the second storage battery BAT2 which are arranged in parallel, the electronic switches Tl, T2, T3 and T4 are controlled to be switched on and off, and various control and protection functions are achieved, so that an equipment control system is more intelligent and integrated, the system loss is reduced, the efficiency is improved, the equipment volume is reduced, and the reliability and the stability are better.
Further, a first voltage detection module is connected in series between the first MOS transistor T1 and the first diode D1, a second voltage detection module is connected in series between the second MOS transistor T2 and the fourth diode D4, a third voltage detection module is connected in series between the third MOS transistor T3 and the LED display screen, and a fourth voltage detection module is connected in series between the fourth MOS transistor T4 and the LED display screen. In this embodiment, first voltage detection module, second voltage detection module, third voltage detection module and fourth voltage detection module all can adopt the singlechip of STM32F103ZET6 model, and singlechip I is the terminal voltage that detects first battery BAT1, when having arrived float charging voltage, then by the constant current charge to the float stage of charging. The singlechip II detects the terminal voltage of the second storage battery BAT2, and when the floating charging voltage is reached, the floating charging stage is reached by constant current. The singlechip III detects the terminal voltage of the first storage battery BAT1, and when the voltage is recovered, the constant current is charged to trickle discharge. The singlechip IV detects the terminal voltage of the second storage battery BAT2, and when the voltage is recovered, the constant current is charged to trickle discharge.
In this embodiment, a first relay KM1 is connected in series between the gate of the first MOS transistor T1 and the control module, and a normally open contact k1 of the first relay KM1 is connected in series between the first diode D1 and the solar panel. When the singlechip I detects that the voltage of the first storage battery BAT1 is low, the first relay KM1 is electrified, the normally open contact k1 is closed, the grid electrode of the first MOS transistor T1 outputs high level, the first MOS transistor T1 is conducted, and the solar panel starts to charge the first storage battery BAT 1; after charging for a period of time, when the single chip microcomputer I detects that the voltage of the first storage battery BAT1 is sufficient, the controller controls the first relay KM1 to be powered off, the normally open contact k1 is disconnected, the grid electrode of the first MOS transistor T1 outputs a low level, the first MOS transistor T1 is cut off, and charging is finished to prevent the storage battery from being overcharged. The first diode D1 plays a role of unidirectional charging, preventing the first battery BAT1 from reversely charging the solar cell panel. A third relay KM3 is connected between the grid of the third MOS transistor T3 and the control module in series, and a normally open contact k3 of the third relay KM3 is connected between the third voltage detection module and the LED display screen in series. When third relay KM3 got the electricity, normally open contact k3 was closed, third MOS pipe T3's grid output high level, third MOS pipe T3 switches on, first battery BAT1 discharges to the LED display screen, when singlechip III detected first battery BAT1 voltage lower, the controller will control third relay KM3 outage, normally open contact k3 disconnection, third MOS pipe T3's grid output low level, third MOS pipe T3 ends, first battery BAT1 stops discharging, in order to prevent the battery overdischarge.
A second relay KM2 is connected between the grid of the second MOS transistor T2 and the control module in series, and a normally open contact k2 of the second relay KM2 is connected between the fourth diode D4 and the solar panel in series. When the singlechip II detects that the voltage of the second storage battery BAT2 is low, the second relay KM2 is electrified, the normally open contact k2 is closed, the second MOS tube T2 is conducted, and the solar panel starts to charge the second storage battery BAT 2; after the second battery BAT2 is fully charged, the second relay KM2 is powered off, the normally open contact k2 is disconnected, the second MOS transistor T2 is cut off, and charging is stopped. The fourth diode D4 also functions as a unidirectional charge, preventing the second battery BAT2 from reversely charging the solar cell panel. A fourth relay KM4 is connected between the grid of the fourth MOS transistor T4 and the control module in series, and a normally open contact k4 of the fourth relay KM4 is connected between the fourth voltage detection module and the LED display screen in series. When the fourth relay KM4 is electrified, the normally open contact k4 is closed, the fourth MOS tube T4 is conducted, and the second storage battery BAT2 discharges the LED display screen; after the fourth relay KM4 is powered off, the normally open contact k4 is disconnected, the fourth MOS transistor T4 is cut off, and the second storage battery BAT2 stops discharging.
Further, a second diode D2 is connected in parallel between the source and the drain of the first MOS transistor T1, and two ends of the second diode D2 are respectively connected to the first voltage detection module and the first battery BAT 1; a fifth diode D5 is connected in parallel between the source and the drain of the second MOS transistor T2, and two ends of the fifth diode D5 are connected to the second voltage detection module and the second battery BAT2, respectively; a third diode D3 is connected in parallel between the source and the drain of the third MOS transistor T3, and two ends of the third diode D3 are connected to the third voltage detection module and the first battery BAT1, respectively; a sixth diode D6 is connected in parallel between the source and the drain of the fourth MOS transistor T4, and both ends of the sixth diode D6 are connected to the fourth voltage detection module and the second battery BAT2, respectively. The second diode D2, the fifth diode D5, the third diode D3 and the sixth diode D6 arranged in the structure all play a role in stabilizing voltage and prevent MOS tubes from being broken down by high voltage.
In this embodiment, each group of 3 LED strings of the LED display screen includes 1 current limiting resistor (R =1502), and a total of 80 groups of branches are provided. And each set of current is limited to 20mA, so that the working current of the LED display screen is about 1600mA, and the working voltage is 12V. The display screen is required to work for 24h a day, the backup power supply has 24h of power supply capacity, and the capacity of the storage battery is calculated according to the discharge rate of 80 percent, wherein Q = Tb multiplied by I =24 multiplied by 1.6 divided by 80% =48Ah, Q is the storage battery capacity, Tb is the discharge time of the storage battery, and I is the working current of the LED display screen. Therefore, the system should be connected with two lead-acid maintenance-free storage batteries of 12V/25Ah in parallel. The storage battery of 50 A.H and the storage batteries of two 25 A.H are selected, the initial charge capacities SOC of the three storage batteries are all set to be 85%, and 10 charge-discharge cycles are respectively carried out by adopting two charge-discharge modes. In order to accurately compare the charge capacities of the two control systems, the same discharge condition is adopted for all the storage batteries in the experiment. Fig. 3 is a graph of the change in SOC of a battery, in which curve I represents the discharge capacity of a 50 A.H battery using a conventional control system, and curve II represents the average discharge capacity of two parallel-connected 25 A.H batteries using the optimal control system of the present system. From fig. 3, it can be seen that the discharge capacity of the storage battery in the optimized control system is greatly improved, and therefore, the charging capacity of the storage battery is improved by adopting the method, and the utilization efficiency of the photovoltaic system is also improved. The optimization control system continuously detects the voltage and the current at two ends of the storage load LED, and experimental results show that when the voltage of the storage battery fluctuates within the range of 12-14V, the PWM controller can stabilize the voltage of the LED display screen to be about 12V, and the current of the load also approximately changes within the range specified by 1200 mA-1600 mA.
In the embodiment, only voltages at two ends of two storage batteries connected in parallel are detected, so that the algorithm is simple, the system runs stably, the utilization efficiency of photovoltaic power generation is improved to the maximum extent, the polarization phenomenon of a storage battery plate generated by long-time discharge of a single group of storage batteries is relieved, and the conversion efficiency of the storage batteries is improved; the PWM constant current control can obtain satisfactory voltage stabilization and constant current effects, the service life and the reliability of the LED are improved, the cost of a photovoltaic system is saved, the manual maintenance frequency is reduced, and the reliability and the stability of photovoltaic system equipment are improved.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides an intelligent charge-discharge control system of solar energy LED screen which characterized in that: the solar energy storage battery pack comprises a solar panel, an LED display screen and at least two groups of storage batteries, wherein the two groups of storage batteries are a first storage battery (BAT 1) and a second storage battery (BAT 2) respectively, and the first storage battery (BAT 1) and the second storage battery (BAT 2) are connected in parallel; the first storage battery (BAT 1) and the second storage battery (BAT 2) are connected with the solar panel through a charging control switch, and the first storage battery (BAT 1) and the second storage battery (BAT 2) are connected with the LED display screen through a discharging control switch; and the charging control switch and the discharging control switch are connected with the control module.
2. The intelligent charge and discharge control system for the solar LED screen according to claim 1, characterized in that: the charging control switch comprises a first control switch and a second control switch, the first control switch is respectively connected with the solar panel, the first storage battery (BAT 1) and the control module, and the second control switch is respectively connected with the solar panel, the second storage battery (BAT 2) and the control module; the discharging control switch comprises a third control switch and a fourth control switch, the third control switch is respectively connected with the LED display screen, the first storage battery (BAT 1) and the control module, and the fourth control switch is respectively connected with the LED display screen, the second storage battery (BAT 2) and the control module.
3. The intelligent charge and discharge control system for the solar LED screen according to claim 2, characterized in that: the first control switch is a first MOS transistor (T1), the source electrode of the first MOS transistor (T1) is connected with the solar panel through a first diode (D1), the drain electrode of the first MOS transistor (T1) is connected with the negative electrode of the first storage battery (BAT 1), and the grid electrode of the first MOS transistor (T1) is connected with the control module.
4. The intelligent charge and discharge control system of the solar LED screen according to claim 3, characterized in that: the second control switch is a second MOS (T2), the source of the second MOS (T2) is connected with the solar panel through a fourth diode (D4), the drain of the second MOS (T2) is connected with the cathode of a second storage battery (BAT 2), and the gate of the second MOS (T2) is connected with the control module.
5. The intelligent charge and discharge control system of the solar LED screen according to claim 4, characterized in that: the third control switch is a third MOS tube (T3), the source electrode of the third MOS tube (T3) is connected with the negative electrode of the first storage battery (BAT 1), the drain electrode of the third MOS tube (T3) is connected with the LED display screen, and the grid electrode of the third MOS tube (T3) is connected with the control module.
6. The intelligent charge and discharge control system of the solar LED screen according to claim 5, characterized in that: the fourth control switch is a fourth MOS (T4), the source electrode of the fourth MOS (T4) is connected with the negative electrode of the second storage battery (BAT 2), the drain electrode of the fourth MOS (T4) is connected with the LED display screen, and the grid electrode of the fourth MOS (T4) is connected with the control module.
7. The intelligent charge and discharge control system of the solar LED screen according to claim 6, characterized in that: a first voltage detection module is connected between the first MOS tube (T1) and the first diode (D1) in series, a second voltage detection module is connected between the second MOS tube (T2) and the fourth diode (D4) in series, a third voltage detection module is connected between the third MOS tube (T3) and the LED display screen in series, and a fourth voltage detection module is connected between the fourth MOS tube (T4) and the LED display screen in series.
8. The intelligent charge and discharge control system for the solar LED screen according to claim 6 or 7, characterized in that: a first relay (KM 1) is connected between the grid of the first MOS transistor (T1) and the control module in series, and a normally open contact (k 1) of the first relay (KM 1) is connected between the first diode (D1) and the solar panel in series; a second relay (KM 2) is connected between the grid of the second MOS transistor (T2) and the control module in series, and a normally open contact (k 2) of the second relay (KM 2) is connected between the fourth diode (D4) and the solar panel in series; a third relay (KM 3) is connected between the grid of the third MOS transistor (T3) and the control module in series, and a normally open contact (k 3) of the third relay (KM 3) is connected between the third voltage detection module and the LED display screen in series; a fourth relay (KM 4) is connected between the grid of the fourth MOS transistor (T4) and the control module in series, and a normally open contact (k 4) of the fourth relay (KM 4) is connected between the fourth voltage detection module and the LED display screen in series.
9. The intelligent charge and discharge control system of the solar LED screen according to claim 8, characterized in that: a second diode (D2) is connected in parallel between the source and the drain of the first MOS transistor (T1), and two ends of the second diode (D2) are respectively connected with the first voltage detection module and the first storage battery (BAT 1); a fifth diode (D5) is connected in parallel between the source and the drain of the second MOS transistor (T2), and two ends of the fifth diode (D5) are respectively connected with the second voltage detection module and the second storage battery (BAT 2); a third diode (D3) is connected in parallel between the source and the drain of the third MOS transistor (T3), and two ends of the third diode (D3) are respectively connected with the third voltage detection module and the first storage battery (BAT 1); a sixth diode (D6) is connected in parallel between the source and the drain of the fourth MOS transistor (T4), and two ends of the sixth diode (D6) are respectively connected with the fourth voltage detection module and the second storage battery (BAT 2).
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