Do you know if friends who often deal with transformers and EMI have noticed the relationship between EMI and leakage? Because the relationship between leakage inductance and EMI is very subtle in practical design applications, studying the relationship between the two may open up new ideas for product EMI design. In this article, Xiaobian will analyze the relationship between EMI and transformer leakage inductance, and interested friends can take a look.
I believe that everyone must have encountered such a situation when designing, the leakage sensation is small, the EMI is qualified, the EMI is unqualified when the leakage inductance is too large, or the leakage inductance is too large, but the EMI is qualified, the leakage inductance is small, but the EMI is unqualified. The situation alternates, so what is the relationship between EMI and transformer leakage inductance in the circuit?
The leakage inductance and distributed capacitance of the transformer are all factors that affect EMI. When the leakage inductance of the transformer is large, the peak current of the output of the switch tube is large, which makes EMI difficult to pass. When the transformer has large distributed capacitance, large capacitance and many noises. Generally, problems occur in the middle and rear stages of the EMI curve, and it is also difficult to pass.
The value of the leakage inductance and the distributed capacitance is determined by the performance in the actual circuit. But even if there is no calculation, if the order of the windings is changed from the transformer, it is necessary to debug. However, considering the process, the general R&D engineers will not start from this point. Such a transformer is not conducive to fabrication.
It can be seen that there is a real relationship between EMI and leakage inductance, but there is no clear linear proportional relationship between the two. And the transformer has a lot of influence factors on EMI, so the relationship between transformer and EMI cannot be completely confirmed. So it seems that once EMI is involved, it will definitely become very complicated, which requires everyone to accumulate more knowledge to deal with.
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