{"id":4856,"date":"2023-10-13T18:08:00","date_gmt":"2023-10-13T10:08:00","guid":{"rendered":"https:\/\/www.qhsmt.com\/?p=4856"},"modified":"2023-10-08T10:30:53","modified_gmt":"2023-10-08T02:30:53","slug":"pick-and-place-machine-how-to-optimize-pcb-design-for-emc-compliance","status":"publish","type":"post","link":"https:\/\/www.qhsmt.com\/zh\/2023\/10\/13\/pick-and-place-machine-how-to-optimize-pcb-design-for-emc-compliance\/","title":{"rendered":"How to Optimize PCB Design for EMC Compliance?"},"content":{"rendered":"

Avoid penalties for non-compliance–Designers need to follow regulations regarding electromagnetic compatibility (EMC) when designing PCBs because failing EMC testing could lead not only do fines but also to loss of customer trust which could cause irreparable damage even if those penalties eventually get waived.Today qihe smt pick and place machine sharing What circuit measures in PCB design can improve the electromagnetic compatibility performance of the product?<\/p>\n\n\n\n

When we design electronic circuits, we pay more attention to the actual performance of the product, and do not consider too much the electromagnetic compatibility characteristics, electromagnetic disturbance suppression and electromagnetic anti-interference characteristics of the product. In order to achieve the purpose of electromagnetic compatibility when using such a circuit schematic diagram for PCB layout, necessary circuit measures must be taken, that is, to add necessary additional circuits on the basis of its circuit schematic diagram to improve the electromagnetic compatibility performance of its products.<\/p>\n\n\n\n

\"How<\/figure>\n\n\n\n

The following circuit measures can be used in actual PCB design:<\/h3>\n\n\n\n

A resistor can be connected in series on the PCB trace to reduce the transition rate of the upper and lower edges of the control signal line.<\/p>\n\n\n\n

Try to provide some form of damping (high-frequency capacitors, reverse diodes, etc.) for relays, etc.<\/p>\n\n\n\n

The signal entering the printed board should be filtered, and the signal from the high-noise area to the low-noise area should also be filtered. At the same time, the method of connecting terminal resistors is used to reduce signal reflection.<\/p>\n\n\n\n

\"How<\/figure>\n\n\n\n

The useless end of the MCU should be connected to the power supply or ground through the corresponding matching resistor. Or defined as an output terminal, the terminals on the integrated circuit that should be connected to the power supply and ground must be connected, and should not be suspended.<\/p>\n\n\n\n

Do not leave the unused gate circuit input in the air, but connect it to the power supply or ground through the corresponding matching resistor. The positive input terminal of the unused op amp is connected to ground, and the negative input terminal is connected to the output terminal.<\/p>\n\n\n\n

\"How<\/figure>\n\n\n\n

Provide a high-frequency decoupling capacitor for each integrated circuit. A small high-frequency bypass capacitor must be added next to each electrolytic capacitor.<\/p>\n\n\n\n

Use large-capacity tantalum capacitors or polyester capacitors instead of electrolytic capacitors as charge and discharge energy storage capacitors on the circuit board. When using tubular capacitors, the case should be grounded.<\/p>\n\n\n\u9605\u8bfb\u66f4\u591a\uff1aHow to Optimize PCB Design for EMC Compliance?<\/span><\/a>\n\n\n

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