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Common methods to avoid interference sources in high-power DC power supplies

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.04.02
The stability and reliability of high-power DC power supplies are crucial in electronic devices and systems. However, interference sources that may exist in the power supply, such as electromagnetic interference (EMI) and radio frequency interference (RFI), can cause damage to the circuit, reduce performance, and even lead to system failures. To avoid these issues, we need to take a series of effective measures to eliminate interference sources. The following are several common methods:



1. Good grounding

Grounding is an important means of eliminating electrical interference. Proper grounding not only provides the required reference potential for the device, but also provides a low impedance path for the charge to flow back to the power source. In the design of high-power DC power supplies, it is usually necessary to connect the metal casing of the equipment, the grounding wire of the circuit board, and the grounding wire of the power cord to the same grounding point to ensure the grounding continuity of the entire system.

2. Use of filters

Filters are key components for eliminating electrical interference. By installing filters on the power line, high-frequency noise and interference signals can be effectively filtered out. Filters are usually composed of components such as inductors, capacitors, and resistors, which can form low-pass, high pass, or bandpass circuits. Choose the appropriate filter type according to actual needs.

3. Electromagnetic shielding

Electromagnetic shielding is an effective method to prevent electromagnetic interference. By setting a metal shielding layer around the power supply, the electromagnetic field can be confined to a small space to prevent it from spreading outward. At the same time, the metal shielding layer can also absorb and reflect electromagnetic waves, thereby reducing its interference with the surrounding environment.

4. Layout and wiring optimization

Reasonable layout and wiring are important means to reduce electromagnetic interference. When designing power supplies, efforts should be made to minimize mutual interference between components, such as avoiding close proximity between high-frequency and low-frequency components. In addition, when wiring, the length of the power cord should be shortened as much as possible to reduce the propagation path of electromagnetic interference. At the same time, the power cord should avoid running parallel to other signal lines to reduce coupling between them.

5. Use isolation transformers

Isolation transformers are another effective method to eliminate electrical interference. By isolating transformers, the electrical connection between the power supply and the load can be isolated, thereby eliminating common mode interference. In addition, isolation transformers can also reduce the ripple noise of the power supply, improve the stability and reliability of the power supply.

In summary, eliminating interference sources in high-power DC power supplies requires the comprehensive use of multiple methods. By means of good grounding, the use of filters, electromagnetic shielding, layout and wiring optimization, and the use of isolation transformers, we can effectively reduce the impact of electrical interference on system performance, improve the stability and reliability of the power supply.
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