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EMI EMC problems of electronic transformerswhat are the causes and how to deal with

In modern electronic equipment and systems, electronic transformers play a vital role and are used in key applications such as energy conversion, isolation, inversion, etc. However, with the continuous development of high-frequency and high-speed electronic technology, the problems of electromagnetic interference (EMI) and electromagnetic compatibility (EMC) caused by electronic transformers have become increasingly prominent. This article will delve into the EMI/EMC problems of electronic transformers, as well as strategies and methods to deal with these issues.

Table of Contents

EMI/EMC problems of electronic transformers

EMI refers to electromagnetic interference, which is a phenomenon in which electromagnetic fields generated by current and voltage changes in electronic equipment and systems leak into the surrounding environment. This interference can affect the normal operation of other devices and even destroy other electronic components.


EMC refers to electromagnetic compatibility, which is the ability to ensure the coexistence of different devices in the same electromagnetic environment. As an important part of the electronic system, the electronic transformer’s work may cause interference and is also susceptible to interference from other components, thus affecting the overall EMC performance of the system.

EMI vs EMC What's the Difference

Factors causing EMI/EMC problems

1. High-frequency operation: High-frequency electronic transformers usually operate in the frequency range from tens of kHz to hundreds of MHz, which makes the electromagnetic fields they generate more easily diffuse into the surrounding environment.

2. Current and voltage changes: The current and voltage changes in the transformer will cause electromagnetic radiation, resulting in EMI.

3. Magnetic materials: Magnetic materials used in transformers, such as ferrite, may also become a source of EMI because they will be magnetized and demagnetized during operation, resulting in changes in the magnetic field.

4. Switching frequency: High-frequency electronic transformers usually involve switching frequency, and rapid changes in switching frequency may cause high-frequency harmonic interference.

Methods to deal with EMI/EMC problems

EMI EMC Problems
EMI EMC Problems

1. Design and layout: During the design process of electronic transformers, EMI/EMC factors should be considered, and appropriate circuit layout and wiring harness wiring methods should be adopted to reduce electromagnetic radiation and induction. For example, reduce the radiation interference by reducing the loop area and shortening the length of the wire.

2. Shielding and Isolation: Use appropriate shielding materials and techniques to limit electromagnetic radiation and induction. Shielding can confine electromagnetic fields within the device and prevent them from spreading to the surrounding environment.

3. Filter: Adding appropriate filters to the input and output circuits can effectively reduce the spread of high-frequency interference. Filters can prevent unwanted harmonics and high-frequency signals from entering the power line or output line.

4. Grounding and connection: Reasonable grounding and connection methods can reduce common mode noise and ground return flow, and help improve the EMC performance of the system.

5. EMC testing and certification: EMC testing should begin at the early stages of product development to identify and resolve potential interference issues. At the same time, ensure that the product complies with relevant EMC certification standards to ensure that it is sold compliantly in the market.

6. Electromagnetic compatibility training: Training engineers and designers to understand EMI/EMC issues, standards and solutions will help to better handle related issues during the design stage.


As a key component of modern electronic systems, electronic transformers must seriously deal with EMI/EMC problems when working in high-frequency environments. Proper design, layout, shielding, filtering, and compliance testing and certification are key steps in solving EMI/EMC problems. Through scientific methods and strategies, the interference caused by electronic transformers can be effectively reduced and the stability, reliability and electromagnetic compatibility of the system can be ensured. At the same time, the field of electronic transformers also requires continuous research and innovation to meet the needs of the evolving high-frequency electronic technology.

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