An explosion-proof touch system for use in hazardous areas in hydrogen environments

Abstract

The invention discloses an explosion-proof touch system applied to a hazardous area in a hydrogen environment, which includes a flameproof box and a switching power supply, multiple safety gates, an image controller, an optical coupler isolation, and a TTL to LVDS adapter board located in the flameproof box; a touch circuit, an LVDS to TTL adapter board, a digital isolation, an audio circuit, and a liquid crystal screen are arranged on the outside of the flameproof box; the image controller, the optical coupler isolation, the TTL to LVDS adapter board, the LVDS to TTL adapter board, the digital isolation, and the liquid crystal screen are connected in sequence, and the touch circuit is connected to the TTL to LVDS adapter board; the switching power supply is connected to the TTL to LVDS adapter board, the liquid crystal screen, and the audio circuit through independent safety gates, respectively, and the safety gate connected to the TTL to LVDS adapter board is also connected to the LVDS to TTL adapter board. The explosion-proof touch system applied to a hazardous area in a hydrogen environment has high safety performance and can be widely used in the field of explosion-proof products for hydrogen, CNG, and LNG.

Description

Technical Field

[0001] The present invention relates to the field of explosion-proof technology, and in particular to an explosion-proof touch system applied to hazardous areas in a hydrogen environment. Background Art

[0002] Since the design starting point of hydrogen energy products is high and difficult, all hydrogen refueling machines have very single functions and cannot provide users with more abundant functions. They are increasingly unable to meet customer service needs. Currently on the market, there is no explosion-proof touch screen that can be used in a hydrogen environment and in hazardous zone 1. Therefore, the present invention will be committed to designing an explosion-proof touch screen technology to realize multimedia functions, which will be widely used in the field of explosion-proof products for hydrogen, CNG, and LNG.

[0003] At present, LCD screens that can be used in hydrogen environments and in hazardous zone 1 are basically explosion-proof. The so-called explosion-proof means that the fire source is completely placed in a explosion-proof box with explosion-proof glass on the front. People can only see the display interface through the explosion-proof glass. Summary of the invention

[0004] The purpose of the present invention is to provide an explosion-proof touch system for use in hazardous areas in a hydrogen environment to solve the above-mentioned problems.

[0005] In order to solve the above technical problems, the present invention provides an explosion-proof touch system for use in hazardous areas in a hydrogen environment, which includes a flameproof box and a switching power supply, multiple safety barriers, an image controller, an optocoupler isolation, and a TTL to LVDS adapter board located in the flameproof box; a touch circuit, an LVDS to TTL adapter board, a digital isolation, an audio circuit, and a liquid crystal screen are arranged on the outside of the flameproof box.

[0006] The image controller, optocoupler isolation, TTL to LVDS adapter board, LVDS to TTL adapter board, digital isolation and LCD screen are connected in sequence, and the touch circuit is connected to the TTL to LVDS adapter board; the switching power supply is connected to the TTL to LVDS adapter board, the LCD screen and the audio circuit through independent safety barriers, and the safety barrier connected to the TTL to LVDS adapter board is also connected to the LVDS to TTL adapter board.

[0007] Furthermore, the explosion-proof touch system used in hazardous areas in a hydrogen environment also includes a backlight LED that provides a light source for the liquid crystal screen.

[0008] Furthermore, there are 8 safety gates, among which safety gate 1 is respectively connected to the TTL to LVDS adapter board and the LVDS to TTL adapter board, and is used to power the TTL to LVDS adapter board and the LVDS to TTL adapter board; safety gate 7 is connected to the backlight LED, safety gate 8 is connected to the audio circuit, and safety gates 2 to 6 are all connected to the LCD screen.

[0009] Furthermore, a DC transformer is connected between the safety gate and the switching power supply, and the DC transformer outputs a 12V DC voltage to the safety gate.

[0010] Furthermore, the touch control circuit is connected to a touch panel.

[0011] Furthermore, the safety barrier is an intrinsically safe safety barrier.

[0012] Further, the output of the safety barrier 2 is connected to the AVDD interface, the output of the safety barrier 3 is connected to the VGL interface, the output of the safety barrier 4 is connected to the VGH interface, the output of the safety barrier 5 is connected to the DVDD interface, and the output of the safety barrier 6 is connected to the VCOM interface.

[0013] The beneficial effects of the present invention are as follows: the explosion-proof touch system used in hazardous areas in hydrogen environments has high safety performance and can be widely used in the fields of explosion-proof products for hydrogen, CNG, and LNG. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The structural diagram of the explosion-proof touch system used in hazardous areas in hydrogen environments is schematically given. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0017] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] The following is a detailed description with reference to the embodiments, and for the sake of simplicity, the following content omits the technical common sense known to those skilled in the art.

[0019] like Figure 1 As shown, the explosion-proof touch system used in hazardous areas in hydrogen environments includes an explosion-proof box and a switching power supply, multiple safety barriers, an image controller, an optical coupler isolation, and a TTL to LVDS adapter board located inside the explosion-proof box. A touch circuit, an LVDS to TTL adapter board, digital isolation, an audio circuit, and an LCD screen are arranged outside the explosion-proof box.

[0020] Among them, the image controller, optocoupler isolation, TTL to LVDS adapter board, LVDS to TTL adapter board, digital isolation and LCD screen are connected in sequence, and the touch circuit is connected to the TTL to LVDS adapter board. The image controller, optocoupler isolation, TTL to LVDS adapter board, LVDS to TTL adapter board, digital isolation and touch screen serve as the transmission flow channel of image data, and the signal delay is 2000ns.

[0021] The switching power supply of the explosion-proof touch system applied to hazardous areas in a hydrogen environment is connected to a TTL to LVDS adapter board, a liquid crystal screen and an audio circuit through independent safety barriers, and the safety barrier connected to the TTL to LVDS adapter board is also connected to the LVDS to TTL adapter board.

[0022] In the specific implementation, each safety barrier, image controller, optocoupler isolation, TTL to LVDS adapter board, and switching power supply, which can be selected as a 24V power supply, are placed in the explosion-proof box. The LVDS to TTL adapter board, digital isolation, LCD screen, touch circuit, and audio circuit are all outside the explosion-proof box. The components with lower safety factors are placed in the explosion-proof box, and the independent safety barrier design can place the components with higher safety factors behind the safety barrier outside the explosion-proof box, which is convenient for realizing and expanding subsequent multimedia functions.

[0023] The purpose of designing each safety barrier is to limit energy so that the components and circuits connected to the subsequent stage cannot generate ignition sources. And the subsequent stage of each safety barrier can strictly limit the energy storage components and the layout of the circuit.

[0024] In actual operation, the principle of optimizing the safety barrier design is: if the corresponding maximum output voltage of the safety barrier is Uo, which can be determined according to the maximum value of the Zener diode, then the maximum output current Io=Uo / R, R is the current limiting device, according to GB3836 or IEC60079 standards, Uo and Io must meet the A.1 short-circuit curve, at the same time, the subsequent energy storage element Co=0.7 times the allowable capacitance value, and the energy storage inductor satisfies 1 / 2×Io²×L=40uJ.

[0025] The explosion-proof touch system used in hazardous areas in hydrogen environments also includes a backlight LED that provides light for the LCD screen. At the same time, in actual applications, the safety barriers can be designed to be 8, among which the safety barrier 1 is connected to the TTL to LVDS adapter board and the LVDS to TTL adapter board respectively, and is used to power the TTL to LVDS adapter board and the LVDS to TTL adapter board; the safety barrier 7 is connected to the backlight LED, the safety barrier 8 is connected to the audio circuit, and the safety barriers 2 to 6 are all connected to the LCD screen.

[0026] Among them, the safety barrier can be preferably selected as an intrinsically safe safety barrier, with the output of safety barrier 2 connected to the AVDD interface, the output of safety barrier 3 connected to the VGL interface, the output of safety barrier 4 connected to the VGH interface, the output of safety barrier 5 connected to the DVDD interface, and the output of safety barrier 6 connected to the VCOM interface, which has strong versatility.

[0027] The touch control circuit can also be connected to a touch panel, which is a resistive touch panel and can be regarded as a component. The settings of optocoupler isolation and digital isolation can reduce the energy storage elements of the intrinsically safe safety barrier. Of course, a DC transformer can also be connected between the safety barrier and the switching power supply, and the DC transformer is used for voltage conversion output, so that the DC transformer outputs 12V DC voltage to the safety barrier.

[0028] In actual operation, the DC transformer, safety barrier 1 to safety barrier 8, and TTL to LVDS adapter board are all integrated on a main board, and the main board is located in an explosion-proof box. Safety barrier 1 is set near the TTL to LVDS adapter board and connected to it, so that the total capacitance of this intrinsically safe part is 12.3uF, and the output voltage of safety barrier 1 is 5V. The touch interface and LVDS interface are integrated on the TTL to LVDS adapter board, and the touch interface on the TTL to LVDS adapter board is connected to the touch circuit through the serial port.

[0029] The LVDS interface on the TTL to LVDS adapter board is connected to the LVDS interface on the LVDS to TTL adapter board through an LVDS cable, and the LVDS to TTL adapter board is connected to the LCD screen through a data bus. Among them, the LVDS to TTL adapter board, digital isolation and touch circuit can be integrated on a circuit board, and the circuit board is located outside the explosion-proof box. The safety barrier 2 to the safety barrier 6 can be connected to the intrinsically safe power interface on the circuit board, and the LCD screen is connected through the intrinsically safe power interface, so that the total capacitance value of the intrinsically safe part of this part is 0.26uF.

[0030] Among them, the output voltage of safety barrier 2 is set to 10.4V, the output voltage of safety barrier 3 is set to 7V, the output voltage of safety barrier 4 is set to 16V, the output voltage of safety barrier 5 is set to 5V, and the output voltage of safety barrier 6 is set to 4.1V. Safety barrier 7 is directly connected to the backlight power interface, the output voltage of safety barrier 7 is 9.1V, and safety barrier 8 is directly connected to the loudspeaker of the audio circuit, so that the intrinsic safety part capacitance value of safety barrier 8 is set to 5.65uF, and the output voltage of safety barrier 8 is set to 5V.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An explosion-proof touch system for use in hazardous areas in a hydrogen environment, characterized by: It includes a flameproof box and a switching power supply, a safety barrier 1, a safety barrier 2, a safety barrier 3, a safety barrier 4, a safety barrier 5, a safety barrier 6, a safety barrier 7, a safety barrier 8, an image controller, an optical coupler isolation and a TTL to LVDS adapter board located in the flameproof box; A touch circuit, an LVDS to TTL adapter board, a digital isolation, an audio circuit and a liquid crystal screen are arranged outside the flameproof box, wherein the LVDS to TTL adapter board, the digital isolation and the touch circuit are integrated on a circuit board, and the circuit board is located outside the flameproof box; The image controller, optical coupler isolation, TTL to LVDS adapter board, LVDS to TTL adapter board, digital isolation and LCD screen are connected in sequence, and the touch control circuit is connected to the TTL to LVDS adapter board. The switching power supply is connected to the TTL to LVDS adapter board through the safety barrier 1. The switching power supply is connected to the liquid crystal screen through the safety gate 2, the safety gate 3, the safety gate 4, the safety gate 5 and the safety gate 6; The switching power supply is connected to the audio circuit via the safety barrier 8; The explosion-proof touch system used in hazardous areas in a hydrogen environment also includes a backlight LED that provides a light source for the liquid crystal screen; The safety gate 1 is connected to the TTL to LVDS adapter board and the LVDS to TTL adapter board respectively, and is used to supply power to the TTL to LVDS adapter board and the LVDS to TTL adapter board; The safety barrier 2, the safety barrier 3, the safety barrier 4, the safety barrier 5 and the safety barrier 6 are all connected to the liquid crystal screen; The safety barrier 7 is connected to the backlight LED; The safety barrier 8 is connected to the loudspeaker of the audio circuit.

2. The explosion-proof touch system for use in hazardous areas in a hydrogen environment according to claim 1, characterized in that: The touch control circuit is connected to a touch panel.

3. The explosion-proof touch system for use in hazardous areas in a hydrogen environment according to claim 1, characterized in that: The safety barrier 1 , the safety barrier 2 , the safety barrier 3 , the safety barrier 4 , the safety barrier 5 , the safety barrier 6 , the safety barrier 7 and the safety barrier 8 are intrinsically safe safety barriers.

4. The explosion-proof touch system for use in hazardous areas in a hydrogen environment according to claim 1, characterized in that: The output of the safety barrier 2 is connected to the AVDD interface, the output of the safety barrier 3 is connected to the VGL interface, the output of the safety barrier 4 is connected to the VGH interface, the output of the safety barrier 5 is connected to the DVDD interface, and the output of the safety barrier 6 is connected to the VCOM interface.

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