Subway passenger guide display control drive device

Abstract

The invention relates to the technical field of a subway station display terminal, and in particular to a subway guide display control driving device. The driving device comprises: a PCB board, a power input port (power input socket) arranged on the PCB board, a power protection module, a first rectifier, a first PWM controller, a transformer, a second rectifier, a first filter, a second PWM controller, an energy storage inductor, a second filter, and a power output port. The power input port is used to access a 110V power supply, and the power output port is connected to the input end of the power protection module; the output end of the power protection module is connected to the input end of the first rectifier. The invention has the advantages of integrating a power supply (DC / DC power supply module) and an LCD power supply board onto a PCB board, optimizing components on the power supply (DC / DC power supply module) and components on the LCD power supply board, so as to enhance the anti-interference and anti-vibration performance of the DC / DC power supply module, so as to ensure the normal operation of the LCD.

Description

Technical Field

[0001] The invention relates to the technical field of subway station display terminals, and in particular to a subway passenger guide display control drive device. Background Art

[0002] When the A board sends the startup signal to the B board, the differential signal connected with the VGA line has the disadvantage of weak anti-interference.

[0003] The power supply (DC / DC power supply module) has two to three outputs, which can be connected to the load equipment to power the load equipment. The existing power supply in the subway is connected to the LCD power supply board through a wire lead (cable). During use, the power supply in the subway and the LCD power supply board often have problems such as poor contact, unstable power supply, and high failure rate. The above problems are mainly due to the lead connection. There are problems such as lead aging, easy heating, weak anti-interference, and excessive power consumption; especially in the operating environment of the subway, due to vibration, the wire lead joints are easily loose, poor contact, and unstable power supply, resulting in a high failure rate, which seriously affects the service life of the product. Summary of the invention

[0004] The object of the present invention is to provide a power supply device for a subway passenger guide display terminal, which is used to integrate an LCD power supply board of a load device into a DC / DC power supply board to solve the above-mentioned deficiencies of the prior art.

[0005] The technical method of the present invention is implemented as follows: the power supply device includes: a PCB board (printed circuit board), a power input port (power input socket) arranged on the PCB board, a power protection module, a first rectifier, a first PWM controller, a transformer, a second rectifier, a first filter, a second PWM controller, an energy storage inductor, a second filter, and a power output port (power output socket), wherein:

[0006] The power input port is used to connect to a 110V power supply, and the power output port is connected to the input end of the power protection module; the output end of the power protection module is connected to the input end of the first rectifier, and the protection circuit is used to protect the components at the rear end of the power input port from being damaged under the conditions of overvoltage, overcurrent, surge, electromagnetic interference, etc.; the output end of the first rectifier is connected to the input end of the first PWM controller, and the first rectifier is used to convert the AC power input by the power protection module into DC power and output it to the first PWM controller; the output end of the first PWM controller is connected to the input end of the transformer, and the first PWM controller is used to receive the output voltage feedback of the transformer and the current feedback of the primary coil of the transformer, control the on and off of the primary coil, realize the output voltage adjustment, and convert the DC power into AC power; the output end of the transformer is connected to the output end of the second rectifier, and the transformer is used to step down the AC power output by the first PWM controller and output it to the second rectifier; the output end of the second rectifier is connected to the input end of the first filter, and the second rectifier is used to convert the low-voltage AC power output by the transformer into low-voltage DC power and output it to the first filter; The output end of the first filter is connected to the input and output of the second PWM controller, and the first filter is used to filter the current output by the second rectifier to achieve stable output of the current;

[0007] The output end of the second PWM controller is connected to the input end of the energy storage inductor, and the second PWM controller is used to receive the current feedback signal output by the energy storage inductor, adjust the output duty cycle, and control the charge and discharge time of the energy storage inductor to adjust the output voltage and current; The output end of the energy storage inductor is connected to the input end of the second filter, and the energy storage inductor is used to boost the voltage output by the second PWM controller;

[0008] The output end of the second filter is connected to the power output port (power output socket) on the PCB board;

[0009] The output end of the second filter is connected to a power output port (power output socket) on the PCB board.

[0010] Preferably, the power protection module includes: a fuse, a Schottky diode, a general diode, a CBB capacitor, a thermistor, and a photoresistor. One end of the fuse is connected to the positive electrode of the power supply, and the other end of the fuse is connected to the anode of the Schottky diode. The cathode of the Schottky diode is respectively connected to the anode of the general diode, one end of the CBB capacitor, one end of the thermistor, and one end of the photoresistor. The cathode of the general diode, the other end of the CBB capacitor, the other end of the thermistor, and one end of the photoresistor are respectively connected to the cathode of the power supply.

[0011] The advantages and positive effects of the present invention are:

[0012] 1. The present invention integrates a power supply (DC / DC power supply module) and an LCD power supply board into a PCB board, optimizes the components on the power supply (DC / DC power supply module) and the components on the LCD power supply board, so as to enhance the anti-interference and anti-vibration performance of the DC / DC power supply module to ensure the normal operation of the LCD.

[0013] 2. The present invention integrates the power supply (DC / DC power supply module) and the LCD power supply board into one PCB board, so that the present invention can directly power the LCD. Compared with the previous power supply (DC / DC power supply module) and the LCD power supply board used separately, it is more convenient to install and safer to use. In addition, it also improves production efficiency and reduces overall production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the overall structural circuit diagram of the present invention.

[0015] Figure 2 It is a circuit diagram of the power supply structure of the present invention.

[0016] Figure 3 It is a circuit diagram of a second PWM controller of the present invention.

[0017] Figure 4 It is a circuit diagram of the power protection module of the present invention.

[0018] Figure numerals: power input port 1, power protection module 2, first rectifier 3, first PWM controller 4, transformer 5, second rectifier 6, first filter 7, second PWM controller 8, energy storage inductor 9, second filter 10, power output port 11, fuse 21, Schottky diode 22, general diode 23, CBB capacitor 24, thermistor 25, photoresistor 26. DETAILED DESCRIPTION

[0019] See also Figure 1-4 The present invention includes: a printed circuit board, a power input port 1 (power input socket) arranged on the printed circuit board, a power protection module 2, a first rectifier 3, a first PWM controller 4, a transformer 5, a second rectifier 6, a first filter 7, a second PWM controller 8, an energy storage inductor 9, a second filter 10, and a power output port 11 (power output socket), wherein:

[0020] The power input port 1 is used to connect to a 110V power supply, and the power output port 1 is connected to the input end of the power protection module 2; the output end of the power protection module 2 is connected to the input end of the first rectifier 3, and the protection circuit is used to protect the first rectifier 3, the first PWM controller 4, the transformer 5, the second rectifier 6, the first filter 7, the second PWM controller 8, the energy storage inductor 9, the second filter 10, and the power output port 11 at the rear end of the power input port from being damaged under overvoltage, overcurrent, surge, electromagnetic interference, etc.; the output end of the first rectifier 3 is connected to the input end of the first PWM controller 4, and the first rectifier 3 is used to convert the alternating current input by the power protection module 2 into direct current and output it to the first PWM controller 4; the output end of the first PWM controller 4 is connected to the input end of the transformer 5, and the first PWM controller 4 is used to receive the output voltage feedback of the transformer 5 and the current feedback of the primary coil of the transformer 5, control the on and off of the primary coil, realize output voltage adjustment, and convert direct current into alternating current; The output end of the transformer 5 is connected to the output end of the second rectifier 6, and the transformer 5 is used to step down the AC power output by the first PWM controller 4 and output it to the second rectifier 6; the output end of the second rectifier 6 is connected to the input end of the first filter 7, and the second rectifier 6 is used to convert the low-voltage AC power output by the transformer 5 into low-voltage DC power and output it to the first filter 7; the output end of the first filter 7 is connected to the input and output of the second PWM controller, and the first filter 7 is used to filter the current output by the second rectifier 6 to achieve stable output of the current;

[0021] The output end of the second PWM controller 8 is connected to the input end of the energy storage inductor, and the second PWM controller 8 is used to receive the current feedback signal output by the energy storage inductor, adjust the output duty cycle, and control the charge and discharge time of the energy storage inductor 9 to adjust the output voltage and current; The output end of the energy storage inductor 9 is connected to the input end of the second filter 10, and the energy storage inductor 9 is used to boost the voltage output by the second PWM controller 8;

[0022] The output end of the second filter 10 is connected to a power output port 11 (power output socket) on the PCB board.

[0023] See also Figure 4The power protection module 2 of the present invention includes: a fuse 21, a Schottky diode 22, a general diode 23, a CBB capacitor 24, a thermistor 25, and a photoresistor 26. One end of the fuse 21 is connected to the positive electrode of the power supply, and the other end of the fuse 21 is connected to the anode of the Schottky diode 22. The cathode of the Schottky diode 22 is respectively connected to the anode of the general diode 23, one end of the CBB capacitor 24, one end of the thermistor 25, and one end of the photoresistor 26. The cathode of the general diode 23, the other end of the CBB capacitor 24, the other end of the thermistor 25, and one end of the photoresistor 26 are respectively connected to the cathode of the power supply.

Claims

1. A subway guide display control drive device, The invention is characterized in that it comprises: a PCB board, a power input port arranged on the PCB board, a power protection module, a first rectifier, a first PWM controller, a transformer, a second rectifier, a first filter, a second PWM controller, an energy storage inductor, a second filter, and a power output port, wherein: The power input port is used to connect to a 110V power supply, and the power output port is connected to the input of the power protection module. The output end of the power protection module is connected to the input end of the first rectifier; the output end of the first rectifier is connected to the input end of the first rectifier The output end is connected to the input end of the first PWM controller, and the first rectifier is used to convert the input of the power protection module The alternating current is converted into direct current and output to the first PWM controller; the output end of the first PWM controller is connected to the input end of the transformer; the output end of the transformer is connected to the output end of the second rectifier, and the transformer is used to step down the alternating current output by the first PWM controller and output it to the second rectifier; the output end of the second rectifier is connected to the input end of the first filter, and the second rectifier is used to convert the low-voltage alternating current output by the transformer into low-voltage direct current and output it to the first filter; the output end of the first filter is connected to the output end of the second PWM controller, and the first filter is used to filter the current output by the second rectifier; The output end of the second PWM controller is connected to the input end of the energy storage inductor; the output end of the energy storage inductor is connected to the input end of the second PWM controller; The input end of the second filter is connected, and the energy storage inductor is used to boost the voltage output by the second PWM controller; the output end of the second filter is connected to the power output port on the PCB board; The power protection module includes: a fuse, a Schottky diode, a general diode, a CBB capacitor, a thermistor, and a photoresistor. One end of the fuse is connected to the positive electrode of the power supply, and the other end of the fuse is connected to the anode of the Schottky diode. The cathode of the Schottky diode is respectively connected to the anode of the general diode, one end of the CBB capacitor, one end of the thermistor, and one end of the photoresistor. The cathode of the general diode, the other end of the CBB capacitor, the other end of the thermistor, and one end of the photoresistor are respectively connected to the cathode of the power supply.

Images