Bus station connecting screen power supply control system and communication mainboard

Abstract

The utility model relates to the technical field of bus station connecting screens, in particular to a bus station connecting screen power supply control system and communication mainboard, which comprises an RS232 circuit, an RS485 circuit and an LED circuit, the RS232 circuit, the RS485 circuit and the LED circuit are mutually connected in parallel and are electrically connected with a DC5V power supply circuit, the DC5V power supply circuit is electrically connected with an external power supply P3 through a 24V power supply circuit, and the external power supply P3 is electrically connected with the communication mainboard through a 24V power supply circuit. Meanwhile, the RS232 circuit is electrically connected with a port P2, and the RS485 circuit is electrically connected with a port P1. The bus station screen connection power supply control system converts an external power supply through the DC5V power supply circuit and the 24V power supply circuit, and supplies power to subsequent functional modules, thereby reducing unstable or short circuit conditions in the operation process through providing stable power supply voltage, and improving the safety of the bus station screen connection power supply control system. Therefore, the situation that most of the elements are damaged due to the fact that original complex connecting elements are not beneficial to circuit control can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of bus station screen connection, in particular to a bus station screen connection power supply control system and a communication mainboard. Background Art

[0002] With the rapid development of electronic products, more requirements are put forward for control devices. For example, the display content of the screen at the bus stop is no longer a simple display of a few lines of text, but a graphic display method with richer pictures, more friendly interfaces and more powerful functions. Among them, the Chinese utility model patent with publication number CN207250105U discloses an advertising machine with dual control motherboards and dual screens, which has solved the problem that due to the lack of necessary information interaction units, the content displayed on the two screens is isolated and the interactive sharing of dual-screen information cannot be realized. On the other hand, using a simple control unit, power supply unit, and screen design circuit, and simply superimposing the circuit to design a dual-screen or even multi-screen advertising machine will cause many disadvantages of idleness of other equipment resources in the device.

[0003] The Chinese utility model patent with the publication number CN213818031U discloses a set-top box display screen and control mainboard connection structure that is resistant to electromagnetic interference. Through the specific technical structure setting, it effectively solves the problem that information is generally displayed through an LCD screen. The LCD screen is connected to the mainboard inside the set-top box through a cable. During the operation of the set-top box, a large amount of electromagnetic waves will be generated. The cable connecting the mainboard and the LCD screen will be interfered by the electromagnetic waves, resulting in the display screen eventually displaying blurred graphics and other technical drawbacks. However, in actual use, the power control and communication mainboard of the station-connected screen with a similar structure still has many defects, such as: due to the frequent occurrence of voltage instability during use, the chips and accessories are burned, and it is found that the original design is too complicated and causes waste of resources. Therefore, there is an urgent need for a power control and communication mainboard for the station-connected screen to solve these problems. Utility Model Content

[0004] The purpose of the utility model is to provide a bus station screen power supply control system and a communication mainboard to solve the problems raised in the above-mentioned background technology.

[0005] The technical solution of the utility model is: a bus stop screen power supply control system, including an RS232 circuit, an RS485 circuit and an LED circuit, the RS232 circuit, RS485 circuit and LED circuit are connected in parallel with each other and electrically connected to a DC5V power supply circuit, and the DC5V power supply circuit is electrically connected to an external power supply P3 through a 24V power supply circuit, while the RS232 circuit is electrically connected to port P2, and the RS485 circuit is electrically connected to port P1.

[0006] Furthermore, the 24V power supply circuit includes a chip U1, the BOOT port of the chip U1 is electrically connected to the capacitor C4, the capacitor C4 is electrically connected to the SW port of the chip U1 and the inductor L1, the inductor L1 is electrically connected to the resistor R6, the capacitor C5, the capacitor C6, the capacitor C7, the cathode of the diode D5, the cathode of the diode D6 and the DC5V power supply circuit, and the resistor R6 is electrically connected to the resistor R5 and the VOUT / FB port of the chip U1, and the resistor R5 is electrically connected to the PGND port of the chip U1, the capacitor C5, the capacitor C6, the capacitor C7, the anode of the diode D5 and the anode of the diode D6;

[0007] The VIN port of the chip U1 is electrically connected to the resistor R4, the capacitor C2, the capacitor C8, the capacitor C9, the cathode of the diode D3, the cathode of the diode D4 and the external power supply P3, the resistor R4 is electrically connected to the EN / CLKIN port of the chip U1 and the resistor R2, the VCC port of the chip U1 is electrically connected to the capacitor C3, and the capacitor C3 is electrically connected to the resistor R2, the capacitor C2, the capacitor C8, the capacitor C9, the anode of the diode D3 and the anode of the diode D4.

[0008] Furthermore, the DC5V power supply circuit includes a chip U5, a VIN port of the chip U5 is electrically connected to a 24V power supply circuit, a resistor R35, a capacitor C30, a capacitor C31 and a cathode of a diode D10, an EN port of the chip U5 is electrically connected to resistors R35 and R37, a COMP port of the chip U5 is electrically connected to capacitors C34 and R39, and resistor R39 is electrically connected to capacitor C35, and an SS port of the chip U5 is electrically connected to capacitor C36;

[0009] The BOOT port of the chip U5 is electrically connected to capacitor C29, and the capacitor C29 is electrically connected to the cathode of the diode D7. The PH port of the chip U5 is electrically connected to the inductor L3. At the same time, the inductor L3 is electrically connected to the cathode of the diode D7 and the resistor R36, capacitor C15, capacitor C16, capacitor C17, the cathode of the diode D9, the RS232 circuit, the RS485 circuit and the LED circuit. The capacitor C15, capacitor C16, capacitor C17 and diode D9 are connected in parallel to each other and electrically connected to the 5V power supply port. At the same time, the resistor R36 is electrically connected to the resistor R38, and the resistor R38 is electrically connected to the resistor R40 and the VSENSE port of the chip U5.

[0010] Furthermore, the RS232 circuit includes a chip U2, the C1+ port of the chip U2 is electrically connected to the C1- port of the chip U2 through a capacitor C1, the C2+ port of the chip U2 is electrically connected to the C2- port of the chip U2 through a capacitor C10, the V+ port of the chip U2 is electrically connected to the V- port of the chip U2 through a capacitor C11 and a capacitor C12, the VCC port of the chip U2 is electrically connected to an inductor L3 and a capacitor C13, the T1OUT port of the chip U2 is electrically connected to a T1OUT signal output port, the R1IN port of the chip U2 is electrically connected to a R1IN signal input port, the R1OUT port of the chip U2 is electrically connected to a R1OUT signal output port through a resistor R3, the T1IN port of the chip U2 is electrically connected to a T1IN signal input port through a resistor R7, and the GND port of the chip U2 and capacitors C11, C12, and C13 are all grounded.

[0011] Furthermore, the RS485 circuit includes a chip U3, the RE port of the chip U3 is electrically connected to a resistor R27, a collector of a transistor Q2 and a DE port of the chip U3, the base of the transistor Q2 is electrically connected to a resistor R25 and a resistor R26, the resistor R25 and a DI port of the chip U3 are electrically connected to an R1OUT signal output port, the resistor R26 is electrically connected to an emitter of the transistor Q2, and the RO port of the chip U3 is electrically connected to a T1IN signal input port;

[0012] The VCC port of the chip U3 is electrically connected to the capacitor C14. A The port is electrically connected to resistor R12 and resistor R13, wherein the resistor R12 is electrically connected to resistor R11, COM-A3 communication port and port 2 of rectifier bridge D8, and the resistor R13 is electrically connected to resistor R14 and B of chip U3. B Port, the resistor R14 is electrically connected to the resistor R15 and port 1 of the rectifier bridge D8;

[0013] The VCC port of the chip U3, the resistor R11, and the resistor R27 are electrically connected to the inductor L3, and the emitter of the transistor Q2, the resistor R15, the resistor R26, the capacitor C14, the 3-port of the rectifier bridge D8, and the GND port of the chip U3 are all grounded.

[0014] Furthermore, the LED circuit includes a light emitting diode D11, a cathode of the light emitting diode D11 is grounded, and an anode of the light emitting diode D11 is electrically connected to the inductor L3 via a resistor R8.

[0015] A bus stop screen communication mainboard includes a circuit board body that executes the bus stop screen power control system, a mounting plate is provided at the lower end of the circuit board body, a lithium ion battery and a protective component are provided at the upper end of the circuit board body, the protective component is provided at the upper end of the lithium ion battery, and the protective component is fixed to the upper end of the mounting plate through a side plate, the lithium ion battery is electrically connected with a bent terminal, and the bent terminal is provided on the upper side of the circuit board body.

[0016] Furthermore, the protective component includes a protective cover and a spring, the circuit board body is arranged at the lower end of the protective cover, a fixing block is arranged at the upper end of the protective cover, the fixing block passes through the lower end of the protective cover and is connected to the circuit board body, and the spring is arranged at the lower end of the circuit board body.

[0017] Furthermore, both ends of the circuit board body are fixed to the upper end of the mounting plate through a support seat and a screw rod, the support seat is arranged at the lower end of the screw rod, and the screw rod is fixedly connected to the support seat through a nut, and an insulating gasket is sleeved on the outer side of the screw rod;

[0018] The spring is arranged on the side of the support seat, and a support plate is arranged on the upper end of the spring, a sponge pad is arranged on the upper end of the support plate, and the sponge pad is arranged on the lower end of the circuit board body, and the lower end of the circuit board body and the upper end of the sponge pad are in contact with each other.

[0019] Furthermore, a ventilation groove is provided at the lower end of one side of the fixed block, and the ventilation groove is provided in the middle of the upper end of the protective cover. At the same time, a dustproof net is provided inside the ventilation groove, and a cooling fan and a temperature control diode are provided at the upper end of the dustproof net. The temperature control diode is provided at the lower end of the cooling fan, and the cooling fan is fixed to the inside of the ventilation groove by screws.

[0020] The utility model provides a bus station screen power supply control system and a communication mainboard through improvement, which has the following improvements and advantages compared with the prior art:

[0021] Firstly, the bus station screen power supply control system of the utility model converts the external power supply through the DC5V power supply circuit and the 24V power supply circuit, and supplies power to the subsequent functional modules, thereby providing a stable power supply voltage to reduce the instability or short circuit during operation, thereby avoiding the original complex connection components from being damaged due to the disadvantage of the control circuit;

[0022] Secondly: The bus stop screen communication mainboard of the utility model is equipped with various components of the bus stop screen power control system, a bent terminal block and a lithium-ion battery on the circuit board body, so that the switch of the circuit board body can be controlled by the switching transistor, and the voltage is passed through the power inductor to work. When the voltage value changes greatly, the inductor will resist the change of current, thereby playing a role of current limiting. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model is further explained below in conjunction with the accompanying drawings and embodiments:

[0024] Figure 1 This is the system block diagram of the utility model bus station screen power supply control system;

[0025] Figure 2 It is a circuit diagram of the 24V power supply circuit of the utility model;

[0026] Figure 3 This is the circuit diagram of the DC5V power supply circuit of the utility model;

[0027] Figure 4 It is a circuit diagram of the RS232 circuit of the utility model;

[0028] Figure 5 It is a circuit diagram of the RS485 circuit of the utility model;

[0029] Figure 6 It is a circuit diagram of the LED circuit of the utility model;

[0030] Figure 7 It is a top view of the cross-sectional view of the communication main board of the bus station connection screen of the utility model;

[0031] Figure 8 It is a side cross-sectional view of the communication main board of the bus station screen connection of the utility model;

[0032] Fig. 9 It is a partial side cross-sectional view of the fixing block of the utility model;

[0033] Fig.10 It is a front view of the protective cover of the utility model;

[0034] Fig.11 It is a partial top view of the mounting plate of the utility model;

[0035] Description of reference numerals:

[0036] 1. Mounting plate; 101. Circuit board body; 102. Lithium-ion battery; 103. Bent terminal; 2. Protection assembly; 201. Side panel; 202. Protection cover; 203. Support seat; 204. Screw; 205. Insulating gasket; 206. Nut; 207. Spring; 208. Support plate; 209. Sponge pad; 3. Fixing block; 301. Ventilation slot; 302. Cooling fan; 303. Screw; 304. Dust net; 305. Temperature control diode. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0039] Furthermore, it should be understood that for the sake of ease of description, the sizes of the various components shown in the drawings are not drawn according to actual proportions. For example, the thickness or width of certain layers may be exaggerated relative to other layers.

[0040] It should be noted that like reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined or described in one drawing, it will not require further detailed discussion and description in the description of the subsequent drawings.

[0041] Example 1

[0042] refer to Figure 1-Figure 6This embodiment provides a bus station screen power supply control system, which includes an RS232 circuit, an RS485 circuit and an LED circuit. The RS232 circuit, the RS485 circuit and the LED circuit are connected in parallel with each other, and the parallel circuit between the three is electrically connected to an external power supply P3 through a DC5V power supply circuit and a 24V power supply circuit, wherein the DC5V power supply circuit is electrically connected to the 24V power supply circuit, and the 24V power supply circuit is electrically connected to an external power supply P3. Specifically, the RS232 circuit and the RS485 circuit are connected to each other and exchange information, and at the same time, the RS232 circuit is electrically connected to port P2, and the RS485 circuit is electrically connected to port P1.

[0043] In this embodiment, the 24V power supply circuit includes a chip U1, the BOOT port of the chip U1 is electrically connected to the capacitor C4, the capacitor C4 is electrically connected to the SW port of the chip U1 and the inductor L1, the inductor L1 is electrically connected to the resistor R6, the capacitor C5, the capacitor C6, the capacitor C7, the cathode of the diode D5, the cathode of the diode D6 and the DC5V power supply circuit, and the resistor R6 is electrically connected to the resistor R5 and the VOUT / FB port of the chip U1, and the resistor R5 is electrically connected to the PGND port of the chip U1, the capacitor C5, the capacitor C6, the capacitor C7, the anode of the diode D5 and the anode of the diode D6. The VIN port of chip U1 is electrically connected to resistor R4, capacitor C2, capacitor C8, capacitor C9, the cathode of diode D3, the cathode of diode D4 and the external power supply P3, resistor R4 is electrically connected to the EN / CLKIN port of chip U1 and resistor R2, the VCC port of chip U1 is electrically connected to capacitor C3, and capacitor C3 is electrically connected to resistor R2, capacitor C2, capacitor C8, capacitor C9, the anode of diode D3 and the anode of diode D4.

[0044] In this embodiment, the DC5V power supply circuit includes a chip U5, the VIN port of the chip U5 is electrically connected to the 24V power supply circuit, the resistor R35, the capacitor C30, the capacitor C31 and the cathode of the diode D10, the EN port of the chip U5 is electrically connected to the resistor R35 and the resistor R37, the COMP port of the chip U5 is electrically connected to the capacitor C34 and the resistor R39, and the resistor R39 is electrically connected to the capacitor C35, and the SS port of the chip U5 is electrically connected to the capacitor C36. The BOOT port of chip U5 is electrically connected to capacitor C29, and capacitor C29 is electrically connected to the cathode of diode D7. The PH port of chip U5 is electrically connected to inductor L3. At the same time, inductor L3 is electrically connected to the cathode of diode D7 and resistor R36, capacitor C15, capacitor C16, capacitor C17, the cathode of diode D9, RS232 circuit, RS485 circuit and LED circuit. Capacitor C15, capacitor C16, capacitor C17 and diode D9 are connected in parallel to each other and electrically connected to the 5V power supply port. At the same time, resistor R36 is electrically connected to resistor R38, and resistor R38 is electrically connected to resistor R40 and the VSENSE port of chip U5.

[0045] In this embodiment, the RS232 circuit includes a chip U2, a C1+ port of the chip U2 is electrically connected to a C1- port of the chip U2 through a capacitor C1, a C2+ port of the chip U2 is electrically connected to a C2- port of the chip U2 through a capacitor C10, a V+ port of the chip U2 is electrically connected to a V- port of the chip U2 through a capacitor C11 and a capacitor C12, a VCC port of the chip U2 is electrically connected to an inductor L3 and a capacitor C13, a T1OUT port of the chip U2 is electrically connected to a T1OUT signal output port, a R1IN port of the chip U2 is electrically connected to a R1IN signal input port, a R1OUT port of the chip U2 is electrically connected to a R1OUT signal output port through a resistor R3, a T1IN port of the chip U2 is electrically connected to a T1IN signal input port through a resistor R7, and a GND port of the chip U2 and capacitors C11, C12, and C13 are all grounded.

[0046] In this embodiment, the RS485 circuit includes a chip U3. The port is electrically connected to resistor R27, the collector of transistor Q2 and the DE port of chip U3. The base of transistor Q2 is electrically connected to resistor R25 and resistor R26. Resistor R25 and the DI port of chip U3 are both electrically connected to the R1OUT signal output port. Resistor R26 is electrically connected to the emitter of transistor Q2. The RO port of chip U3 is electrically connected to the T1IN signal input port. The VCC port of chip U3 is electrically connected to capacitor C14. The A port of chip U3 is electrically connected to the capacitor C14. AThe port is electrically connected to resistor R12 and resistor R13, resistor R12 is electrically connected to resistor R11, COM-A3 communication port and port 2 of rectifier bridge D8, resistor R13 is electrically connected to resistor R14 and chip U3 B B Port, resistor R14 is electrically connected to resistor R15 and port 1 of rectifier bridge D8. VCC port of chip U3, resistor R11, resistor R27 are electrically connected to inductor L3, and the emitter of transistor Q2, resistor R15, resistor R26, capacitor C14, port 3 of rectifier bridge D8 and GND port of chip U3 are all grounded.

[0047] In this embodiment, the LED circuit includes a light emitting diode D11 , a cathode of the light emitting diode D11 is grounded, and an anode of the light emitting diode D11 is electrically connected to the inductor L3 via a resistor R8 .

[0048] Specifically, the DC5V power supply circuit and the 24V power supply circuit realize the conversion of the system power supply from 24v->5v voltage and supply power to each functional unit. The RS485 circuit is connected to the TTL interface in the RS232 circuit, so that the communication level conversion function between the RS485 circuit and the RS232 circuit can be realized. At the same time, the LED circuit has a power indication function. When power is on, the LED indicator can be used to observe whether the mainboard power supply is normal.

[0049] Example 2

[0050] refer to Figure 7-Figure 11 , this embodiment provides a bus station screen communication motherboard, which includes a circuit board body 101 that executes the bus station screen power control system in the above-mentioned embodiment 1. In this embodiment, a lithium-ion battery 102, a bent terminal 103 and a protective component 2 are arranged at the upper end of the circuit board body 101. The protective component 2 is arranged at the upper end of the lithium-ion battery 102, and the protective component 2 is fixed to the upper end of the mounting plate 1 through the side plate 201. The lithium-ion battery 102 is electrically connected to the bent terminal 103, and the bent terminal 103 is arranged on the upper side of the circuit board body 101. Specifically, the lithium-ion battery 102 is electrically connected between the bent terminal 103 and the resettable fuse, so as to play a protective role. That is to say, the protected positive electricity is transmitted to the VCC port of the power output port through the bent terminal 103, and the other end of the lithium-ion battery 102 is connected in parallel to the negative pole of the bent terminal 103, so that the power supply can be better filtered and stabilized, thereby ensuring the stable operation of the subsequent module.

[0051] In this embodiment, the protective assembly 2 includes a protective cover 202 and a spring 207. The circuit board body 101 is arranged at the lower end of the protective cover 202, and a fixing block 3 is arranged at the upper end of the protective cover 202, and the fixing block 3 passes through the lower end of the protective cover 202 and is connected to the circuit board body 101, and the spring 207 is arranged at the lower end of the circuit board body 101. Further, both ends of the circuit board body 101 are fixed to the upper end of the mounting plate 1 through a support seat 203 and a screw rod 204, the support seat 203 is arranged at the lower end of the screw rod 204, and the screw rod 204 is fixedly connected to the support seat 203 through a nut 206, and an insulating gasket 205 is sleeved on the outer side of the screw rod 204. The spring 207 is arranged on the side of the support seat 203, and a support plate 208 is arranged on the upper end of the spring 207. A sponge pad 209 is arranged on the upper end of the support plate 208. The sponge pad 209 is arranged on the lower end of the circuit board body 101, and the lower end of the circuit board body 101 and the upper end of the sponge pad 209 are in contact. Specifically, the setting of the insulating gasket 205 can prevent the metal conductivity of the nut 206 from affecting the normal operation of the circuit. The elastic force of the spring 207 acts on the support plate 208, so that the support plate 208 can provide shock-absorbing support for the circuit board body 101, thereby preventing the circuit board body 101 from being damaged due to large vibrations during the driving of the bus.

[0052] Specifically, the four openings of the circuit board body 101 are passed through the screw rod 204 and installed on the top of the support seat 203, and then the insulating gasket 205 is sleeved on the outside of the screw rod 204 and located on the top of the circuit board body 101, and then the nut 206 is rotated and installed on the top of the screw rod 204, so that the circuit board body 101 can be fixedly installed on the top of the support seat 203. After that, the protective cover 202 is rotated between the side plates 201, so that the protective cover 202 covers the top of the circuit board body 101, so that it protects the circuit board body 101, thereby improving the overall protection of the device.

[0053] Further, a ventilation slot 301 is provided at the lower end of one side of the fixed block 3, and the ventilation slot 301 is provided at the middle of the upper end of the protective cover 202. At the same time, a dustproof net 304 is provided inside the ventilation slot 301, and a cooling fan 302 and a temperature control diode 305 are provided at the upper end of the dustproof net 304. The temperature control diode 305 is provided at the lower end of the cooling fan 302, and the cooling fan 302 is fixed inside the ventilation slot 301 by screws 303. Specifically, the cooling fan 302 is fixedly installed inside the fixed block 3 by screws 303, so that the cooling fan 302 can dissipate heat for the circuit board body 101, thereby avoiding the circuit board body 101 from short circuit due to overheating. At the same time, the circuit board body 101 can be dissipated through the ventilation slot 301, and the inside of the protective cover 202 can be dustproofed through the dustproof net 304, that is, on the one hand, dust accumulation is avoided, and on the other hand, the heat dissipation effect of the electronic components on the surface of the circuit board body 101 is also guaranteed. At the same time, the temperature control diode 305 can sense that the temperature of the mounting plate 1 is high, and control the cooling fan 302 to perform heat dissipation on the mounting plate 1, thereby avoiding the situation where the circuit board body 101 is short-circuited due to the over-high operating temperature of the mounting plate 1. It is worth noting that the information exchange between the cooling fan 302 and the temperature control diode 305 is a conventional information exchange means in the prior art, so it will not be repeated in this embodiment.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bus station screen power supply control system, characterized in that: It includes an RS232 circuit, an RS485 circuit and an LED circuit. The RS232 circuit, RS485 circuit and LED circuit are connected in parallel and electrically connected to a DC5V power supply circuit. The DC5V power supply circuit is electrically connected to an external power supply P3 through a 24V power supply circuit. At the same time, the RS232 circuit is electrically connected to a port P2, and the RS485 circuit is electrically connected to a port P1.

2. A bus station screen power supply control system according to claim 1, characterized in that: The 24V power supply circuit includes a chip U1, a BOOT port of the chip U1 is electrically connected to a capacitor C4, the capacitor C4 is electrically connected to a SW port of the chip U1 and an inductor L1, the inductor L1 is electrically connected to a resistor R6, a capacitor C5, a capacitor C6, a capacitor C7, a cathode of a diode D5, a cathode of a diode D6 and a DC5V power supply circuit, and the resistor R6 is electrically connected to a resistor R5 and a VOUT / FB port of the chip U1, and the resistor R5 is electrically connected to a PGND port of the chip U1, a capacitor C5, a capacitor C6, a capacitor C7, an anode of a diode D5 and an anode of a diode D6; The VIN port of the chip U1 is electrically connected to the resistor R4, the capacitor C2, the capacitor C8, the capacitor C9, the cathode of the diode D3, the cathode of the diode D4 and the external power supply P3, the resistor R4 is electrically connected to the EN / CLKIN port of the chip U1 and the resistor R2, the VCC port of the chip U1 is electrically connected to the capacitor C3, and the capacitor C3 is electrically connected to the resistor R2, the capacitor C2, the capacitor C8, the capacitor C9, the anode of the diode D3 and the anode of the diode D4.

3. A bus station screen power supply control system according to claim 1 or 2, characterized in that: The DC5V power supply circuit includes a chip U5, a VIN port of the chip U5 is electrically connected to a 24V power supply circuit, a resistor R35, a capacitor C30, a capacitor C31 and a cathode of a diode D10, an EN port of the chip U5 is electrically connected to resistors R35 and R37, a COMP port of the chip U5 is electrically connected to capacitors C34 and R39, and resistor R39 is electrically connected to capacitor C35, and an SS port of the chip U5 is electrically connected to capacitor C36; The BOOT port of the chip U5 is electrically connected to capacitor C29, and the capacitor C29 is electrically connected to the cathode of the diode D7. The PH port of the chip U5 is electrically connected to the inductor L3. At the same time, the inductor L3 is electrically connected to the cathode of the diode D7 and the resistor R36, capacitor C15, capacitor C16, capacitor C17, the cathode of the diode D9, the RS232 circuit, the RS485 circuit and the LED circuit. The capacitor C15, capacitor C16, capacitor C17 and diode D9 are connected in parallel to each other and electrically connected to the 5V power supply port. At the same time, the resistor R36 is electrically connected to the resistor R38, and the resistor R38 is electrically connected to the resistor R40 and the VSENSE port of the chip U5.

4. A bus station screen power supply control system according to claim 3, characterized in that: The RS232 circuit includes a chip U2, wherein the C1+ port of the chip U2 is electrically connected to the C1- port of the chip U2 through a capacitor C1, the C2+ port of the chip U2 is electrically connected to the C2- port of the chip U2 through a capacitor C10, the V+ port of the chip U2 is electrically connected to the V- port of the chip U2 through a capacitor C11 and a capacitor C12, the VCC port of the chip U2 is electrically connected to an inductor L3 and a capacitor C13, the T1OUT port of the chip U2 is electrically connected to a T1OUT signal output port, the R1IN port of the chip U2 is electrically connected to a R1IN signal input port, the R1OUT port of the chip U2 is electrically connected to a R1OUT signal output port through a resistor R3, the T1IN port of the chip U2 is electrically connected to a T1IN signal input port through a resistor R7, and the GND port of the chip U2 and capacitors C11, C12, and C13 are all grounded.

5. A bus station screen power supply control system according to claim 3, characterized in that: The RS485 circuit includes a chip U3, wherein the RE port of the chip U3 is electrically connected to a resistor R27, a collector of a transistor Q2 and a DE port of the chip U3, the base of the transistor Q2 is electrically connected to a resistor R25 and a resistor R26, the resistor R25 and a DI port of the chip U3 are electrically connected to an R1OUT signal output port, the resistor R26 is electrically connected to an emitter of the transistor Q2, and the RO port of the chip U3 is electrically connected to a T1IN signal input port; The VCC port of the chip U3 is electrically connected to the capacitor C14. A The port is electrically connected to resistor R12 and resistor R13, wherein the resistor R12 is electrically connected to resistor R11, COM-A3 communication port and port 2 of rectifier bridge D8, and the resistor R13 is electrically connected to resistor R14 and B of chip U3. B Port, the resistor R14 is electrically connected to the resistor R15 and port 1 of the rectifier bridge D8; The VCC port of the chip U3, the resistor R11, and the resistor R27 are electrically connected to the inductor L3, and the emitter of the transistor Q2, the resistor R15, the resistor R26, the capacitor C14, the 3-port of the rectifier bridge D8, and the GND port of the chip U3 are all grounded.

6. A bus station screen power supply control system according to claim 3, characterized in that: The LED circuit includes a light emitting diode D11 , a cathode of the light emitting diode D11 is grounded, and an anode of the light emitting diode D11 is electrically connected to an inductor L3 via a resistor R8 .

7. A bus station screen communication motherboard, characterized in that: The invention comprises a circuit board body (101) for executing the bus stop screen power control system as described in any one of claims 1 to 6, wherein a mounting plate (1) is arranged at the lower end of the circuit board body (101), and a lithium-ion battery (102) and a protective component (2) are arranged at the upper end of the circuit board body (101), wherein the protective component (2) is arranged at the upper end of the lithium-ion battery (102), and the protective component (2) is fixed to the upper end of the mounting plate (1) through a side plate (201), and the lithium-ion battery (102) is electrically connected to a bent terminal (103), and the bent terminal (103) is arranged on the upper side of the circuit board body (101).

8. A bus station screen communication mainboard according to claim 7, characterized in that: The protective component (2) comprises a protective cover (202) and a spring (207); the circuit board body (101) is arranged at the lower end of the protective cover (202); a fixing block (3) is arranged at the upper end of the protective cover (202); the fixing block (3) passes through the lower end of the protective cover (202) and is connected to the circuit board body (101); and the spring (207) is arranged at the lower end of the circuit board body (101).

9. A bus station screen communication mainboard according to claim 8, characterized in that: Both ends of the circuit board body (101) are fixed to the upper end of the mounting plate (1) via a support seat (203) and a screw rod (204); the support seat (203) is arranged at the lower end of the screw rod (204), and the screw rod (204) is fixedly connected to the support seat (203) via a nut (206); and an insulating gasket (205) is sleeved on the outer side of the screw rod (204); The spring (207) is arranged on the side of the support seat (203), and a support plate (208) is arranged at the upper end of the spring (207), a sponge pad (209) is arranged at the upper end of the support plate (208), and the sponge pad (209) is arranged at the lower end of the circuit board body (101), and the lower end of the circuit board body (101) and the upper end of the sponge pad (209) are in contact with each other.

10. A bus station screen communication mainboard according to claim 8, characterized in that: A ventilation slot (301) is provided at the lower end of one side of the fixing block (3), the ventilation slot (301) being provided at the middle of the upper end of the protective cover (202), and a dustproof net (304) is provided inside the ventilation slot (301), a cooling fan (302) and a temperature control diode (305) are provided at the upper end of the dustproof net (304), the temperature control diode (305) is provided at the lower end of the cooling fan (302), and the cooling fan (302) is fixed inside the ventilation slot (301) by means of screws (303).

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