High-reliability anti-interference metal panel capacitive touch switch module

Abstract

The utility model discloses a kind of high-reliability anti-interference metal panel capacitor touch switch module, including metal panel, capacitor touch module, non-metal fixed support, multicolor LED indicator light component and power supply and signal connection unit.Non-metal fixed support is located between metal panel and capacitor touch module, realize electrical isolation to resist interference;Capacitor touch module is pure electronic induction structure, life is super 100 million times;Multicolor LED indicator light component can emit multicolor and combination light;Power supply and signal connection unit contain the connector and protection circuit defined with Pin1-Pin7.This module solves the prior art electromagnetic interference, short life, LED indication single, power supply without protection, pin fuzzy, health dead angle and other problems, applicable to industry, smart home, medical and other scenes, with anti-interference strong, long life, state indication rich, power supply safety, installation clean and other beneficial effects.

Description

Technical Field

[0001] This utility model relates to the field of electronic touch switch technology, and in particular to a high-reliability anti-interference metal panel capacitive touch switch module. Background Technology

[0002] Metal panel capacitive touch switch modules are a type of electronic control device that integrates the durability of metal panels with capacitive touch technology. They are widely used in industrial automation, smart homes, medical equipment and other fields to achieve touch operation without mechanical wear. At the same time, the impact resistance and abrasion resistance of the metal panel can adapt to complex operating environments. The working status is reflected by the indicator light assembly, and the power supply and signal connection unit ensures the power supply and control signal transmission.

[0003] Existing metal panel capacitive touch switch modules have several shortcomings: First, the common structure of direct contact between the metal panel and the capacitive touch module makes them susceptible to electromagnetic interference, significantly reducing touch sensitivity. Second, some modules rely on mechanical structures to assist touch control, resulting in a lifespan far shorter than purely electronic sensing structures, making them unsuitable for high-frequency use. Third, LED indicators are mostly single-color, failing to accurately distinguish between multiple operating states of the device. Fourth, the power supply and signal connection units lack reverse polarity and short-circuit protection mechanisms, making the module highly susceptible to damage when the external power supply is reversed or a short circuit occurs. Fifth, connector pin definitions are ambiguous, easily leading to pin function mismatches when different manufacturers interface with each other. Sixth, gaps or protrusions on the surface after installation create hard-to-clean areas, making cleaning and maintenance difficult. These defects severely impact the module's reliability, practicality, and user experience, failing to meet the requirements for high reliability, interference resistance, long lifespan, and convenient maintenance. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model aims to solve the problems of metal panel capacitive touch switch modules being susceptible to electromagnetic interference, having short touch life, limited LED indication function, lack of power supply system protection, ambiguous connector pin definitions, and the existence of unsanitary corners on the surface.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a high-reliability, anti-interference metal panel capacitive touch switch module, comprising a metal panel, a capacitive touch module, a non-metallic fixing bracket, a multi-color LED indicator assembly, and a power supply and signal connection unit; the non-metallic fixing bracket is disposed between the metal panel and the capacitive touch module, the capacitive touch module is detachably connected to the metal panel through the non-metallic fixing bracket, and the non-metallic fixing bracket provides electrical isolation between the capacitive touch module and the metal panel to ensure capacitive touch sensitivity; the multi-color LED indicator assembly is integrated on one side or around the metal panel of the capacitive touch module, and the multi-color LED indicator assembly can emit red, blue, green light and combinations of the above colors or flashing light to provide indication of the module's working status; the power supply and signal connection unit includes a connector, a reverse polarity protection circuit, a short circuit protection circuit, and an output unit, the connector having seven pins from Pin 1 to Pin 7. The pins are arranged horizontally in sequence, and their functions are defined as follows: Pin 1 is the positive power supply pin, Pin 2 is the negative power supply pin, Pin 3 is the signal output pin, Pin 4 is the LED red control pin, Pin 5 is the LED green control pin, Pin 6 is the LED blue control pin, and Pin 7 is a reserved function pin. Pin 1 is connected to the positive terminal of an external 5-28VDC power supply, Pin 2 is connected to system ground, Pin 3 is connected to the signal output terminal of the capacitive touch module, and Pin 4, Pin 5, and Pin 6 are respectively connected to the red, green, and blue LED control terminals of the multi-color LED indicator assembly. The reverse polarity protection circuit and the short circuit protection circuit are connected in series between Pin 1 and the power supply input terminal of the capacitive touch module to prevent damage to the module from reverse power supply and power supply short circuit. The outer surface of the metal panel has a flat structure, and the capacitive touch module is installed in a hidden manner through the non-metallic fixing bracket, so that the overall surface of the module has no dead corners for hygiene and is resistant to wiping.

[0006] The non-metallic mounting bracket is made of Lexan Resin EXL9330 insulating material, and its thickness is 5.35-12.4mm to accommodate the installation requirements of capacitive touch modules of different sizes.

[0007] A 3M 468MP adhesive transfer tape is also provided between the non-metallic fixing bracket and the metal panel. The adhesive transfer tape is bonded to one side of the non-metallic fixing bracket and the inner side of the metal panel, respectively, to achieve rapid fixing of the non-metallic fixing bracket and the metal panel and improve the structural stability after installation.

[0008] In the multi-color LED indicator assembly, the forward voltage of the red LED is 2.1V and the nominal operating current is 20mA, the forward voltage of the green LED is 3.0V and the nominal operating current is 20mA, and the forward voltage of the blue LED is 3.1V and the nominal operating current is 20mA. The maximum PWM control frequency of the multi-color LED indicator assembly is 100Hz to achieve brightness adjustment and flashing mode control.

[0009] The output unit is one of an open current collector, an OptoMOS relay, or a MOSFET. When the output unit is an open current collector, its rated current is 30mA, the switching voltage is 70VAC / 100VDC, and the output resistance is >10MΩ in the open state and <0.15Ω in the closed state. When the output unit is an OptoMOS relay, its rated current is 100mA, the switching voltage is 42VAC / 60VDC, the output resistance is >10MΩ in the open state and <16Ω in the closed state. When the output unit is a MOSFET, its rated current is 2A, the switching voltage is 40VAC / 40VDC, and the output resistance is >1000MΩ in the open state and <10Ω in the closed state.

[0010] The module operates in a temperature range of -40°C to 85°C and is stored in a temperature range of -40°C to 85°C. The outer side of the metal panel may also be covered with a glass panel with a thickness not exceeding 2mm. The capacitive touch module maintains standard sensitivity for touch operations under the glass panel.

[0011] When the multi-color LED indicator assembly is not lit, the power consumption of the module meets the following requirements: <1mA when the output contact is open and <6mA when the output contact is closed; and the capacitive touch module is a pure electronic sensing structure without mechanical moving parts, and its touch activation life is >100 million times.

[0012] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages compared with the prior art:

[0013] A. Strong anti-interference capability: The non-metallic fixing bracket forms an electrical isolation between the metal panel and the capacitive touch module, effectively avoiding electromagnetic interference and ensuring stable touch sensitivity.

[0014] B. Long lifespan: The capacitive touch module is a pure electronic sensing structure with no mechanical moving parts, and the touch activation lifespan is >100 million times, which is far higher than that of traditional mechanical switches.

[0015] C. Abundant status indicators: The multi-color LED indicator assembly can emit red, blue, green, and combined lights or flashing lights, which can accurately distinguish the multiple working states of the equipment.

[0016] D. Power supply safety: Reverse polarity protection circuit and short circuit protection circuit can prevent reverse power supply and short circuit from damaging the module, improving the reliability of the power supply system.

[0017] E. Easy to connect: The functions of the connector pins 1-7 are clearly defined, avoiding pin function mismatch during connection and reducing the difficulty of connection.

[0018] F. Easy to clean: The metal panel has a smooth outer surface, and the capacitive touch module is hidden, eliminating hard-to-clean corners, making it easy to wipe clean and maintain daily.

[0019] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0020] Figure 1 This is a front view of the metal panel of a high-reliability anti-interference metal panel capacitive touch switch module according to this utility model;

[0021] Figure 2 This is a rear view of the metal panel of a high-reliability anti-interference metal panel capacitive touch switch module according to this utility model.

[0022] Figure 3 This is a top view of the connector for a high-reliability, anti-interference metal panel capacitive touch switch module according to this utility model.

[0023] Figure 4 This is a front view of the connector assembly state of a high-reliability anti-interference metal panel capacitive touch switch module according to this utility model;

[0024] Figure 5 This is a schematic diagram of the power distribution cable for a high-reliability, anti-interference metal panel capacitive touch switch module according to this utility model.

[0025] Figure 6 This is a circuit diagram (without lighting) showing the circuit connection scheme of the power supply and signal connection unit of a high-reliability anti-interference metal panel capacitive touch switch module according to this utility model.

[0026] Figure 7 This is a circuit diagram (with lighting) illustrating the power supply and signal connection unit of a high-reliability, anti-interference metal panel capacitive touch switch module according to this utility model.

[0027] As shown in the figure:

[0028] 1. Metal panel; 2. Capacitive touch module; 3. Non-metallic mounting bracket; 4. Connector. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] like Figure 1-7 As shown, a high-reliability anti-interference metal panel capacitive touch switch module includes a metal panel 1, a capacitive touch module 2, a non-metallic fixing bracket 3, a multi-color LED indicator assembly, and a power supply and signal connection unit.

[0033] Metal Panel 1: Made of 304 stainless steel, with a polished outer surface, featuring a smooth structure, no hard-to-clean corners, and wear resistance. Depending on the application, a glass panel no thicker than 2mm can be placed over it. The capacitive touch module 2 maintains standard sensitivity for touch operations under the glass panel.

[0034] Non-metallic mounting bracket 3: Made of Lexan Resin EXL9330 insulating material, with a thickness of 5.35-12.4mm, the thickness can be selected to match the size specifications of the capacitive touch module 2. This bracket is placed between the metal panel 1 and the capacitive touch module 2, providing electrical isolation between the two. It is also bonded to the inside of the metal panel 1 using 3M 468MP adhesive transfer tape, achieving quick fixation and structural stability.

[0035] Capacitive touch module 2: A purely electronic sensing structure with no mechanical moving parts, its touch activation life is >100 million times. It is detachably connected to the metal panel 1 via a non-metallic mounting bracket 3, enabling concealed installation.

[0036] Multicolor LED indicator assembly: integrated on the side of the capacitive touch module 2 facing the metal panel 1, comprising red, green, and blue LEDs. The red LED has a forward voltage of 2.1V and a nominal operating current of 20mA; the green LED has a forward voltage of 3.0V and a nominal operating current of 20mA; the blue LED has a forward voltage of 3.1V and a nominal operating current of 20mA. The maximum PWM control frequency is 100Hz, which can realize light brightness adjustment and flashing mode control, and is used to indicate the working state of the module.

[0037] Power supply and signal connection unit: including a connector 4, a reverse polarity protection circuit, a short-circuit protection circuit and an output unit. The connector 4 is provided with 7 pins from Pin1 to Pin7, where Pin1 is the power supply positive pin (connected to the positive terminal of an external 5-28VDC power supply), Pin2 is the power supply negative (ground) pin (connected to system ground), Pin3 is the signal output pin (connected to the signal output end of the capacitive touch module 2), Pin4 is the LED red control pin, Pin5 is the LED green control pin, Pin6 is the LED blue control pin, and Pin7 is a reserved function pin. The reverse polarity protection circuit and the short-circuit protection circuit are connected in series between Pin1 and the power supply input end of the capacitive touch module 2 to prevent damage caused by reverse power supply and short circuit. The output unit can be selected from an open collector (rated current 30mA, switching voltage 70VAC / 100VDC, off resistance >10MΩ, on resistance <0.15Ω), an OptoMOS relay (rated current 100mA, switching voltage 42VAC / 60VDC, off resistance >10MΩ, on resistance <16Ω) or a MOSFET (rated current 2A, switching voltage 40VAC / 40VDC, off resistance >1000MΩ, on resistance <10Ω).

[0038] The operating temperature range of this module is -40℃ to 85℃, and the storage temperature range is -40℃ to 85℃. When the multicolor LED indicator assembly is not lit, the power consumption is <1mA in the open state of the output contact, and the power consumption is <6mA in the closed state of the output contact.

[0039] During the use of this utility model, operation adjustments shall be made in combination with specific implementation conditions, with reference to the following:

[0040] Scenario 1: Control scenario of industrial automation production line

[0041] In the equipment control link of industrial automation production lines, traditional mechanical button switches have drawbacks such as fast mechanical wear, weak anti-electromagnetic interference capability, and easy dust accumulation in surface gaps after installation. The use state and linkage details of this utility model are as follows:

[0042] Metal panel 1 installation: The metal panel is made of 304 stainless steel and is customized according to the opening size of the production line control box. The outer surface is polished to ensure that it is flat and free of dead corners.

[0043] Assembly of non-metallic mounting bracket 3 and capacitive touch module 2: A non-metallic mounting bracket made of 8mm thick Lexan Resin EXL9330 insulating material is used to detachably fix the capacitive touch module 2 to the bracket with screws; then, 3M 468MP adhesive transfer tape is used to tightly bond the bracket to the inside of the metal panel 1, so as to achieve electrical isolation between the metal panel and the capacitive touch module, effectively avoiding the impact of electromagnetic interference generated by peripheral equipment (such as frequency converters and motors) on touch sensitivity.

[0044] Linkage between power supply and signal connection unit: Pin 1 of connector 4 is connected to the positive terminal of an external 5-28VDC industrial power supply via a brown BN wire; Pin 2 is connected to system ground via a black BK wire; Pin 3 is connected to the digital input module of the PLC (Programmable Logic Controller) via a white WT wire to transmit touch signals; Pin 4 (red RD wire), Pin 5 (green GN wire), and Pin 6 (blue BL wire) are respectively connected to the red, green, and blue control terminals of the multi-color LED indicator assembly.

[0045] The status of the multi-color LED indicator: the green LED is always on when the equipment is running normally, the red LED flashes when there is a fault, and the blue LED is always on when the equipment is in standby mode. Operators can intuitively judge the status of the equipment.

[0046] Compared with existing technologies: Traditional mechanical buttons require reserved space for mechanical travel, and the surface is prone to dust accumulation after installation and electromagnetic interference can easily lead to accidental touches; This device, through concealed installation and electrical isolation structure, has no dead corners for hygiene, is resistant to wiping, has strong anti-interference ability, and the capacitive touch module has no mechanical wear (lifespan > 100 million times), making it fully suitable for high-frequency and strong interference use environments in industry.

[0047] Scenario 2: Smart Home Kitchen Equipment Control Scenarios

[0048] In the control of smart home kitchen appliances (such as smart ovens and integrated cooktops), traditional touch switches suffer from problems such as easy oil stains on the panel, limited LED indicator functions, and touch sensitivity being affected by environmental interference. The usage and linkage details of this utility model are as follows:

[0049] Composite installation of metal panel and glass panel: The outer side of metal panel 1 is covered with tempered glass panel with a thickness of ≤2mm, and sealed and fixed to the edge of metal panel with glass glue; capacitive touch module 2 still maintains standard sensitivity for touch operation under glass panel coverage, which not only improves aesthetics but also makes it easy to clean oil stains.

[0050] Space adaptation of non-metallic mounting bracket: A non-metallic mounting bracket with a thickness of 5.35mm is selected to fit the compact space inside the kitchen appliance; after assembling the capacitive touch module 2 with the bracket, it is bonded to the inside of the metal panel 1 with 3M 468MP tape to achieve concealed installation.

[0051] Home-based power supply and signal integration: Pin 1 of connector 4 connects to the positive terminal of the home 12VDC power adapter, Pin 2 is grounded, and Pin 3 connects to the input interface of the smart home control host; Pins 4-6 control the multi-color LED indicator light respectively - the blue LED is always on in cooking mode, the green LED is always on in standby mode, and the red LED flashes when there is a fault.

[0052] Compared with existing technologies: Traditional kitchen touch switches are mostly made of plastic panels (easily corroded by oil stains) and have single LED indicators; This device uses a stain-resistant structure of metal and glass panels, multi-state differentiation of multi-color LEDs, and electromagnetic isolation of non-metallic brackets (avoiding interference from appliances such as microwave ovens). During installation, Pin1-Pin7 are clearly defined, allowing users to quickly connect and fully adapt to the usage scenario of "high oil stains and interference from multiple appliances" in the kitchen.

[0053] Scenario 3: Operation of medical equipment monitors

[0054] In the application of control panels for medical monitors, traditional touch-screen devices suffer from drawbacks such as weak anti-interference capabilities (susceptible to electromagnetic influences from medical equipment), difficulty in cleaning (dirt easily accumulates in surface crevices), and unclear indications. The usage and linkage details of this utility model are as follows:

[0055] Medical-grade adapter for metal panel: Metal panel 1 is made of medical-grade stainless steel with antibacterial treatment. It is embedded in the operating area of ​​the monitor during installation. The outer surface is flat and without protrusions, making it easy to wipe with disinfectants such as alcohol.

[0056] The isolation function of the non-metallic fixing bracket: A non-metallic fixing bracket with a thickness of 12.4mm is selected to electrically isolate the capacitive touch module 2 from the metal panel 1, so as to avoid the electromagnetic interference of the ECG module and power supply module inside the monitor from affecting the accuracy of touch control.

[0057] Medical-grade linkage of power supply and signal: Pin 1 of connector 4 is connected to the positive terminal of the 24VDC power supply inside the monitor, Pin 2 is grounded, and Pin 3 is connected to the main board of the monitor's control circuit; Pins 4-6 control the multi-color LED indicator light respectively - the green LED is always on when the patient's indicators are normal, the red LED flashes when the indicators are abnormal, and the blue LED is always on when the device is in standby mode.

[0058] Compared with existing technologies: Traditional medical touch controls are mostly direct contact types made of ordinary plastic or metal (which are susceptible to electromagnetic interference leading to misoperation, and surface gaps are prone to bacterial growth); This device resists interference through an electrical isolation structure, has a flat surface that is easy to disinfect, multi-color LEDs that clearly indicate the status, and capacitive touch control without mechanical contact (avoiding cross-infection). The reverse polarity protection circuit at the power supply end can prevent damage to medical equipment from reverse power connection, fully meeting the requirements of "high reliability and high hygiene standards" in medical scenarios.

[0059] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A high-reliability, anti-interference metal panel capacitive touch switch module, characterized in that, include: Metal panel (1), capacitive touch module (2), non-metallic mounting bracket (3), multi-color LED indicator assembly and power supply and signal connection unit; The non-metallic fixing bracket (3) is disposed between the metal panel (1) and the capacitive touch module (2). The capacitive touch module (2) is detachably connected to the metal panel (1) through the non-metallic fixing bracket (3). The non-metallic fixing bracket (3) provides electrical isolation between the capacitive touch module (2) and the metal panel (1) to ensure capacitive touch sensitivity. The multi-color LED indicator assembly is integrated on one side or around the metal panel (1) of the capacitive touch module (2), and the multi-color LED indicator assembly can emit red, blue, green light and a combination of the above colors or flashing light to provide module working status indication. The power supply and signal connection unit includes a connector (4), a reverse polarity protection circuit, a short circuit protection circuit, and an output unit. The connector (4) has 7 pins, from Pin1 to Pin7, arranged in a horizontal direction. The pin functions are defined as follows: Pin1 is the positive power supply pin, Pin2 is the negative power supply pin, Pin3 is the signal output pin, Pin4 is the LED red control pin, Pin5 is the LED green control pin, Pin6 is the LED blue control pin, and Pin7 is a reserved function pin. Pin1 is connected to the positive terminal of an external 5-28VDC power supply, Pin2 is connected to the system ground, Pin3 is connected to the signal output terminal of the capacitive touch module (2), and Pin4, Pin5, and Pin6 are respectively connected to the red, green, and blue LED control terminals of the multi-color LED indicator assembly. The reverse polarity protection circuit and the short circuit protection circuit are connected in series between the Pin1 and the power supply input terminal of the capacitive touch module (2) to prevent damage to the module from reverse power supply and power supply short circuit. The outer surface of the metal panel (1) is flat, and the capacitive touch module (2) is installed in a hidden manner through the non-metallic fixing bracket (3), so that the overall surface of the module has no dead corners and is resistant to wiping.

2. The high-reliability anti-interference metal panel capacitive touch switch module according to claim 1, characterized in that, The non-metallic mounting bracket (3) is made of Lexan Resin EXL9330 insulating material. The thickness of the non-metallic mounting bracket (3) is 5.35-12.4mm to adapt to the installation requirements of capacitive touch modules (2) of different sizes and specifications.

3. The high-reliability anti-interference metal panel capacitive touch switch module according to claim 1, characterized in that, A 3M468MP adhesive transfer tape is also provided between the non-metallic fixing bracket (3) and the metal panel (1). The adhesive transfer tape is bonded to one side of the non-metallic fixing bracket (3) and the inner side of the metal panel (1) respectively, so as to realize the rapid fixing of the non-metallic fixing bracket (3) and the metal panel (1) and improve the structural stability after installation.

4. The high-reliability anti-interference metal panel capacitive touch switch module according to claim 1, characterized in that, In the multi-color LED indicator assembly, the forward voltage of the red LED is 2.1V and the nominal operating current is 20mA, the forward voltage of the green LED is 3.0V and the nominal operating current is 20mA, and the forward voltage of the blue LED is 3.1V and the nominal operating current is 20mA. The maximum PWM control frequency of the multi-color LED indicator assembly is 100Hz to achieve brightness adjustment and flashing mode control.

5. The high-reliability anti-interference metal panel capacitive touch switch module according to claim 1, characterized in that, The output unit is one of an open current collector, an OptoMOS relay, or a MOSFET. When the output unit is an open current collector, its rated current is 30mA, the switching voltage is 70VAC / 100VDC, and the output resistance is >10MΩ in the open state and <0.15Ω in the closed state. When the output unit is an OptoMOS relay, its rated current is 100mA, the switching voltage is 42VAC / 60VDC, the output resistance is >10MΩ in the open state and <16Ω in the closed state. When the output unit is a MOSFET, its rated current is 2A, the switching voltage is 40VAC / 40VDC, and the output resistance is >1000MΩ in the open state and <10Ω in the closed state.

6. The high-reliability anti-interference metal panel capacitive touch switch module according to claim 1, characterized in that, The module operates in a temperature range of -40°C to 85°C and is stored in a temperature range of -40°C to 85°C. The outer side of the metal panel (1) may also be covered with a glass panel with a thickness not exceeding 2mm. The capacitive touch module (2) maintains standard sensitivity for touch operations under the glass panel.

7. The high-reliability anti-interference metal panel capacitive touch switch module according to claim 1, characterized in that, When the multi-color LED indicator assembly is not lit, the power consumption of the module meets the following requirements: <1mA when the output contact is open and <6mA when the output contact is closed; and the capacitive touch module (2) is a pure electronic sensing structure without mechanical moving parts, and its touch activation life is >100 million times.

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