Industrial monitors need to resist external interference and avoid interfering with other equipments in the complex electromagnetic environment. Electromagnetic compatibility issues directly affect the stability and safety of equipment.
Core difficulties and response strategies
1.High-frequency signal radiation suppression
High-speed signal lines (such as LVDS, HDMI) inside the industrial display are prone to electromagnetic radiation. For example, a certain model of touch screen in the 30MHz band exceeded the standard by 12dB, resulting in peripheral PLC malfunction. The corresponding electromagnetic compatibility solution is to use more than four layers of PCB board structure, set up an independent grounding layer, the implementation of key signal lines snake wiring, measured radiation value reduced by 18dB.
2. External interference intrusion protection
The 20kHz high-frequency arc interference generated by the welding robot can penetrate the display case and cause display jitter. The double-layer shielding electromagnetic compatibility design, for example, the outer layer of 1mm galvanized steel + inner layer of 0.3mm copper foil, with EMI conductive foam sealing interface, interference suppression efficiency of 95%.
3. Power supply noise control
Inverter power supply environment, electromagnetic compatibility interference is obvious，the power supply side measured 2kV surge voltage, may burn the display module. Therefore, it is necessary to integrate TVS diodes and common mode chokes to increase the surge tolerance to 4kV and reduce the conducted nuisance by 30dBμV.
Conclusion
The electromagnetic compatibility design of industrial displays needs to be carried out throughout the entire life cycle of the product, from chip selection, circuit layout to the assembly of the entire machine to form a system-level protection. As verified by actual test data, a reasonable EMC program can reduce the equipment failure rate by more than 70% and provide reliable human-computer interaction for industrial automation systems.
Golden Margins –Entire Range of Touchscreen Products
We hope you found these touchscreen or panel PC fundamentals informative. Goldenmargins offers a broad selection of Industrial Touchscreen Monitors and Touch Panel PCs in various sizes and configurations, including medical touch screens, sunlight-readable touch screens, open-frame touch screens, and waterproof touch panels, as well as other unique touch screen or panel PC designs. You can learn more about our services HERE or by calling us at +86 755 23191996 or sales@goldenmargins.com
