Voltage driving circuit for liquid crystal screen of rail transit control box

Abstract

The utility model discloses a voltage driving circuit used for a rail transit control box liquid crystal screen. The voltage driving circuit comprises an input voltage adjusting module, a boost conversion module, an output voltage adjusting module and a protection circuit module. The input voltage regulation module is used for filtering and regulating direct-current voltage provided by the rail transit equipment and providing stable input voltage; the boost conversion module converts the input voltage into a working voltage required by the liquid crystal screen and optimizes the working voltage; the output voltage adjusting module is used for accurately adjusting and distributing the working voltage; the protection circuit module has an overvoltage and overcurrent protection function, can cut off the circuit or limit the current under an abnormal condition, and guarantees the safety of the liquid crystal screen and the circuit. Through modular design, the power supply system is simple in structure, strong in adaptability, high in stability and reliability, and suitable for rail transit and power supply systems of industrial display liquid crystal screens.

Description

TECHNICAL FIELD

[0001] The utility model relates to rail transit vehicle equipment field, especially relate to a rail transit control box LCD screen voltage drive circuit. BACKGROUND

[0002] With the rapid development of rail transit industry, the intelligentization and integration degree of vehicle equipment are continuously improved, the resolution and response speed requirement of LCD screen as an important window of human-computer interaction is also increasingly improved. However, the normal operation of high-performance LCD screen often needs the support of multiple working voltages, including power supply voltage and opening and closing voltage, which puts forward higher requirements for circuit design.

[0003] The current market LCD screen voltage drive circuit usually adopts complex circuit structure, relies on multiple precision components, although it can meet the performance requirement, but it leads to the problems of higher design cost, poorer reliability, larger size and the like. In addition, the power consumption of such circuit is higher, which is difficult to meet the special requirements of low power consumption and high stability of rail transit equipment. In actual application, these problems may affect the comprehensive performance and maintenance cost of the equipment.

[0004] Therefore, it is urgent to design a LCD screen voltage drive circuit with simple structure, low cost, small power consumption and high stability, which can meet the efficient power supply and voltage drive requirements of rail transit control box LCD screen, and meet the trend of equipment miniaturization and high reliability in the industry. SUMMARY

[0005] To solve the above problems, the purpose of the utility model is to provide a LCD screen voltage drive circuit suitable for rail transit equipment, to solve the problems of complex design, higher cost, larger power consumption and lower reliability in the prior art. The utility model realizes the accurate driving of multiple working voltages of LCD screen through a simple and efficient stable circuit design, and meets the requirements of low power consumption, miniaturization and high reliability of rail transit equipment.

[0006] To achieve the above purpose, the technical scheme of the utility model is: a rail transit control box LCD screen voltage drive circuit, characterized by comprising: an input voltage adjusting module, a boost conversion module, an output voltage adjusting module and a protection circuit module.

[0007] The input voltage adjusting module is used for processing the direct current input voltage provided by the rail transit equipment, ensuring that the input voltage is filtered to meet the voltage fluctuation requirement of circuit operation, and providing stable input for the subsequent circuit module.

[0008] The boost conversion module is used for providing working voltage suitable for LCD screen and further optimizing the voltage.

[0009] The output voltage regulation module precisely regulates and distributes the working voltage generated by the boost converter module by utilizing the characteristic that the voltage across the capacitor does not change abruptly. It can adjust the output voltage in real time according to the working status of the LCD screen, effectively avoiding damage to the LCD screen caused by overvoltage or undervoltage.

[0010] The protection circuit module includes overvoltage protection and overcurrent protection functions, which can quickly cut off the circuit or limit the current in abnormal situations to protect the circuit and LCD screen from damage.

[0011] The beneficial effects of this invention are as follows: First, by employing a boost converter chip and efficient voltage regulation technology, this invention effectively improves the circuit's conversion efficiency, reduces power consumption, and meets the low-energy consumption requirements of rail transit equipment. The circuit design is simple and reliable, ensuring the normal operation of the LCD screen while reducing unnecessary energy loss. Second, this invention enhances circuit reliability by introducing overvoltage protection, overcurrent protection, short-circuit protection, and temperature protection functions, ensuring stable operation of the circuit and LCD screen in complex environments. These protective measures effectively improve equipment safety and extend its service life.

[0012] Finally, this invention simplifies the system structure and reduces production and maintenance costs through optimized circuit design, resulting in strong economic efficiency. Its modular design not only reduces circuit complexity but also improves adaptability and expandability, meeting the voltage driving requirements of different LCD screens and facilitating wide application in rail transit equipment. Attached Figure Description

[0013] Figure 1 This is a block diagram showing the module connection of this utility model;

[0014] Figure 2 This is the circuit diagram of this utility model;

[0015] Figure 3 A connection diagram is provided to illustrate the application environment of the embodiments of this utility model. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] like Figure 1 As shown, a voltage driving circuit for a rail transit control box LCD screen includes an input voltage regulation module, a boost converter module, an output voltage regulation module, and a protection circuit module. The voltage regulation module is connected to the boost converter module, the boost converter module is connected to the output voltage regulation module, and the output voltage regulation module is connected to the protection circuit module.

[0018] The input voltage regulating module is used for processing the DC input voltage provided by the rail transit equipment, ensuring that the input voltage is filtered to adapt to the voltage fluctuation of the circuit operation requirement, and providing stable input for the subsequent circuit modules.

[0019] The boost conversion module is based on a high-efficiency DC-DC conversion architecture, which can perform a boost operation on the input voltage to provide an operating voltage suitable for the liquid crystal screen and further optimize the voltage. The module uses an optimized topology to further reduce power consumption and improve conversion efficiency.

[0020] The output voltage regulating module precisely regulates and distributes the operating voltage generated by the boost conversion module using the characteristic that the voltage on both sides of the capacitor does not change abruptly, to meet the different driving requirements of the liquid crystal screen in different states (such as on, off and running state). The module has a dynamic adjustment function, which can adjust the output voltage in real time according to the working state of the liquid crystal screen, effectively avoiding the damage of overvoltage or undervoltage to the liquid crystal screen;

[0021] The protection circuit module includes overvoltage protection and overcurrent protection functions, which can quickly cut off the circuit or limit the current in abnormal conditions to protect the circuit and the liquid crystal screen from damage, significantly improving the reliability of the overall circuit.

[0022] For example, Figure 2As shown, the specific circuit connection of the utility model is: 5V voltage is connected to one end of input voltage adjusting module resistor R5, the other end of resistor R5 is connected to one end of capacitor C7, capacitor C8 and capacitor C9 respectively, and is connected to 3 pin, 6 pin, 7 pin of boost conversion module boost chip N1 and one end of inductor L1, the other end of capacitor C7, capacitor C8 and capacitor C9 is grounded;The 1 pin of boost conversion module boost chip N1 is connected to one end of capacitor C14 and resistor R7 respectively, the other end of resistor R7 is connected to one end of capacitor C16, the other end of capacitor C14 and capacitor C16 is grounded GND;The 4 pin of boost chip N1 is grounded GND;The 8 pin of boost chip N1 is connected to one end of capacitor C15, the other end of capacitor C15 is grounded GND;The 5 pin of boost chip N1 is connected to the other end of inductor L1 and the positive pole of rectifier diode VD6 respectively, and is connected to one end of output voltage adjusting module capacitor C5 and capacitor C1, the negative pole of rectifier diode VD6 is connected to one end of resistor R6, capacitor C10, capacitor C11, capacitor C12, capacitor C13 and 11V respectively, the other end of resistor R6 is connected to one end of resistor R8, the other end of resistor R8 is connected to the 2 pin of boost chip N1 and one end of resistor R9 respectively, the other end of resistor R9 is grounded GND, the other end of capacitor C10, capacitor C11, capacitor C12 and capacitor C13 is grounded GND;The other end of output voltage adjusting module capacitor C1 is connected to the 3 pin of high-speed switching diode VD1, the 1 pin of high-speed switching diode VD1 is connected to 11V, the 2 pin of high-speed switching diode VD1 is connected to one end of capacitor C2, and is connected to one end of protection circuit module resistor R1, the other end of capacitor C2 is grounded GND;The other end of capacitor C5 is connected to the 3 pin of high-speed switching diode VD4, the 1 pin of high-speed switching diode VD4 is connected to one end of capacitor C4, and is connected to one end of protection circuit module resistor R3, the other end of capacitor C4 and the 2 pin of high-speed diode VD4 are grounded GND;The other end of protection circuit module resistor R1 is connected to the negative pole of voltage stabilizing diode VD2, one end of capacitor C3 and resistor R2 and 20V respectively, the positive pole of voltage stabilizing diode VD2 is connected to the negative pole of voltage stabilizing diode VD3, the other end of voltage stabilizing diode VD3, capacitor C3 and resistor R2 is grounded GND;The other end of resistor R3 is connected to the positive pole of voltage stabilizing diode VD5, one end of capacitor C6 and resistor R4 and-6V8 respectively, the negative pole of voltage stabilizing diode VD5, capacitor C6 and the other end of resistor R4 are grounded GND.

[0023] The model of the above-mentioned boost chip N1 is FP6290, the model of inductor L1 is LQH5BPN4R7NT0, the model of voltage stabilizing diode VD2 and VD3 is BZT52C10, the model of voltage stabilizing diode VD5 is BZT52C6V8, and the model of high-speed switching diode VD1 and VD4 is BAV99.

[0024] The embodiment, as Figure 3The utility model discloses the application environment builds the connection block diagram of implementation: control box equipment is connected with liquid crystal screen through the utility model voltage drive circuit, combines Figure 2 , control box equipment provides 5V power supply voltage for voltage drive circuit power supply, and then voltage drive circuit through the effect of internal boost chip N1 will 5V voltage lift to 11V voltage for liquid crystal screen power supply, from voltage drive circuit boost chip rear end rectifier diode VD6 before leading out a way of unrectified output voltage through the effect of high -speed switch diode realizes liquid crystal screen opening and closing voltage drive, and specific working condition is, when the voltage before rectifier diode VD6 is 0V, the 11V of high -speed switch diode VD1's 1 foot charges the capacitor C1, when the voltage before rectifier diode VD6 is 11V, since the characteristic of capacitor, the voltage of both ends of capacitor C1 can not mutate, therefore, the voltage of left side of capacitor C1 is 11V, and the voltage of right side of capacitor C1 is 22V, and the voltage of the 2nd foot and the 3rd foot of high -speed switch diode VD1 is also 22V, and the voltage flows through the voltage clamping 20V of the back pole zener diode VD2 and VD3, and provides the opening voltage for liquid crystal screen, and similarly, when the voltage before rectifier diode VD6 is 9.6V, charges the capacitor C5, when the voltage before rectifier diode VD6 is 0V, since the characteristic of capacitor, the voltage of both ends of capacitor C1 can not mutate, therefore, the voltage of left side of capacitor C1 is 0V, and the voltage of right side of capacitor C1 is -11V, and the voltage of the 2nd foot and the 3rd foot of high -speed switch diode VD1 is also -11V, and the voltage flows through the voltage clamping -6.8V of the back pole zener diode VD5, and is used for providing the closing voltage for liquid crystal screen, and in this way, the voltage drive of liquid crystal screen can be realized, and it can be observed that liquid crystal screen can normally open and close state.

[0025] The utility model discloses the effect of boost chip FP6290, through adjusting 5V voltage to 11V to provide power supply voltage for liquid crystal screen, from rectifier diode before leading out a way of unrectified output voltage through the effect of high -speed switch diode realizes liquid crystal screen opening and closing voltage drive, and circuit design is simple, and the reliability is strong and low in cost, satisfies the need of development.

Claims

1. A rail transit control box liquid crystal screen voltage drive circuit, characterized in that, The utility model relates to a kind of voltage regulator module for rail transit equipment, including: input voltage regulating module, boost conversion module, output voltage regulating module and protection circuit module, the voltage regulating module is connected with the boost conversion module, the boost conversion module is connected with the output voltage regulating module, the output voltage regulating module is connected with the protection circuit module; The input voltage regulating module is used to process the DC input voltage provided by rail transit equipment, the boost conversion module is used to provide working voltage suitable for liquid crystal screen, the output voltage regulating module accurately adjusts and distributes the working voltage generated by boost conversion module, and the protection circuit module can quickly cut off the circuit or limit the current in abnormal conditions. ​ 2. The rail transit control box LCD screen voltage drive circuit according to claim 1, characterized in that, The specific circuit connection is that one end of 5V voltage is connected to one end of input voltage regulating module resistor R5, the other end of resistor R5 is connected to one end of capacitor C7, capacitor C8 and capacitor C9 respectively, and is connected to 3 pin, 6 pin and 7 pin of boost conversion module boost chip N1 and one end of inductor L1, the other end of capacitor C7, capacitor C8 and capacitor C9 is connected to ground; 1 pin of boost conversion module boost chip N1 is connected to one end of capacitor C14 and resistor R7 respectively, the other end of resistor R7 is connected to one end of capacitor C16, the other end of capacitor C14 and capacitor C16 is connected to ground GND; 4 pin of boost chip N1 is connected to ground GND; 8 pin of boost chip N1 is connected to one end of capacitor C15, the other end of capacitor C15 is connected to ground GND; 5 pin of boost chip N1 is connected to the other end of inductor L1 and positive electrode of rectifier diode VD6 respectively, and is connected to one end of output voltage regulating module capacitor C5 and capacitor C1, negative electrode of rectifier diode VD6 is connected to one end of resistor R6, capacitor C10, capacitor C11, capacitor C12, capacitor C13 and 11V respectively, the other end of resistor R6 is connected to one end of resistor R8, the other end of resistor R8 is connected to 2 pin of boost chip N1 and one end of resistor R9 respectively, the other end of resistor R9 is connected to ground GND, the other end of capacitor C10, capacitor C11, capacitor C12 and capacitor C13 is connected to ground GND; the other end of output voltage regulating module capacitor C1 is connected to 3 pin of high-speed switch diode VD1, 1 pin of high-speed switch diode VD1 is connected to 11V, 2 pin of high-speed switch diode VD1 is connected to one end of capacitor C2, and is connected to one end of protection circuit module resistor R1, the other end of capacitor C2 is connected to ground GND; the other end of capacitor C5 is connected to 3 pin of high-speed switch diode VD4, 1 pin of high-speed switch diode VD4 is connected to one end of capacitor C4, and is connected to one end of protection circuit module resistor R3, the other end of capacitor C4 and 2 pin of high-speed switch diode VD4 is connected to ground GND; the other end of protection circuit module resistor R1 is connected to negative electrode of voltage stabilizing diode VD2, one end of capacitor C3 and resistor R2 and 20V respectively, positive electrode of voltage stabilizing diode VD2 is connected to negative electrode of voltage stabilizing diode VD3, the other end of positive electrode of voltage stabilizing diode VD3, capacitor C3 and resistor R2 is connected to ground GND; the other end of resistor R3 is connected to positive electrode of voltage stabilizing diode VD5, one end of capacitor C6 and resistor R4 and -6V8 respectively, the other end of negative electrode of voltage stabilizing diode VD5, capacitor C6 and resistor R4 is connected to ground GND.

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