Motherboard interface shielding cover, what are the design precautions of shielding cover + 15 years of manufacturer and you analysis

The hardware technicians responsible for the production of the motherboard interface shielding cover said that the shielding cover is an alloy metal cover, which is a vital component to reduce display radiation. Application in MID or VR products can effectively reduce the mutual interference between modules. As shown in the figure, it is common in the isolation between the main control function module and the power module and the Wifi module. Xiaoshuo takes everyone to see what issues should be paid attention to in the design of the motherboard shielding cover: Generally, there are products that use wireless communication, and usually a shielding frame is designed on the circuit board (to isolate electromagnetic interference (EMI), but the shielding frame should be used. Function, generally need to use two parts, one is the shielding frame made by SMT, and the other is the shielding cover, so more than two sets of press molds are required. The surface of the shielding frame is mostly hollowed out. It is directly welded with the main board. The shielding cover is buckled around and directly buckled on the shielding frame. This makes it easy to remove the shielding frame without removing the shielding frame when disassembling and repairing. In MID or VR products In PCB design, we often shield some modules. 1. Power module (PMU+DCDC+LDO) Usually the power module is used as a heat source and interference source to exist on the PCB, and a shielding cover is added to it to effectively reduce Its external radiation interference. 2. Core module (CPU+DDR+Flash[EMMC]) The core module is the core part of the PCB. Stable and undisturbed operation is an important part of the stability of the system, as it is vulnerable to external interference. The module usually also designs a shielding cover to shield it. 3. As the integration of the module continues to increase, the WiFi module also integrates many other functions, such as Bluetooth. The more integrated, the more it will naturally be Signal reception produces interference. Another main source of interference is the components on the PCB. The high-frequency circuits when they are working will produce strong interference. At this time, most brand manufacturers will use shielding to remove or weaken the antenna from the motherboard. Metal shields are a good choice because they can effectively shield the influence of electromagnetic waves on internal circuits. Of course, they also block the electromagnetic waves generated inside from radiating outward. Of course, the location of the antenna is also important. Generally, the side of the board is relatively clean. Demonstrated a Wifi Bluetooth module with shielding cover. Hardware, 15 years of focusing on motherboard interface shielding, 20000+ sets of customized stamping mold production experience, monthly processing capacity of 100+ sets of molds, hundreds of precision processing production equipment, daily The production capacity is 3 million times, the precision of silk-like stamping can reach 0.01mm, the raw materials are imported and the original national standard factory, and 16 quality inspections are strictly controlled.