source:Industry News release time:2021-12-18 Article author:sznbone Popular:pcb
1. Like the flyback power circuit, the PCB circuit has a very important impact on EMC. If it is too large, the radiation will be poor.
2. The effect of filter wiring. The filter is used to filter out interference, but poor PCB wiring may lose the filter's due effect.
3. In the structural part, the incorrect grounding of the radiator design will affect the grounding of the shielded version.
4. The sensitive part is too close to the interference source, such as the EMI circuit, and the switch is too close. This inevitably leads to poor EMC and requires a clear isolation zone.
5. RC absorption circuit wiring.
6. The Y capacitor is grounded and routed, and the location of the Y capacitor is also very important.
PCB design safety regulations consider other factors
1. Know what certifications your product has and what product type it belongs to. For example, medical treatment, telecommunications, electricity, television, etc., although they are different, they also have many similarities.
2. Understand the nature of insulation in safety regulations that are close to PCB layout. Some places are basic insulation, and some places are reinforced insulation. Different standard insulation distances are different.
3. Pay attention to the safety devices of the product, such as the magnetic force of the transformer and the relationship between the primary and secondary sides.
4. The distance between the radiator and the surrounding area is different. The grounding method of the radiator is different. The insulation is different. The ground is still cold, and the insulation of hot ground is the same.
5. Pay special attention to the strictest insurance distance. The distance before and after the fuse is the same.
6. The relationship between Y capacitance, leakage current and contact current.
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