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The main three reasons for generating power supply noise and their impacts

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.04.11
Power supply noise refers to the fluctuation of voltage or current caused by various factors in the power circuit. This fluctuation not only has a negative impact on the stability and performance of electronic devices, but may also pose a threat to the safety of the devices. The generation of power supply noise can be mainly attributed to the following three aspects:



1. Quality issues with the power supply itself

The design and manufacturing quality of the power supply itself is an important factor in the generation of power supply noise. For example, if the filtering circuit inside the power supply is not designed properly or the quality of the components is not up to standard, it may lead to high-frequency harmonic components in the output voltage or current of the power supply, resulting in noise. In addition, the mismatch between the rated power and load of the power supply may also lead to the generation of noise. When the load of the power supply changes significantly, the output voltage and current of the power supply will also change accordingly, resulting in noise.

2. The impact of external environment

External environmental factors are also an important cause of power supply noise. For example, electromagnetic interference (EMI) and radio frequency interference (RFI) can have adverse effects on power supplies. When there are high-frequency devices or strong electromagnetic fields near the power supply, the power supply may be interfered with, resulting in noise. In addition, environmental factors such as temperature and humidity changes may also have an impact on the working status of the power supply, leading to the generation of noise.

3. Improper power management strategy

The selection and implementation of power management strategies are also important factors affecting power noise. For example, during the power switching process, if the switching speed is too fast or the switching method is improper, it may cause a sudden change in the output voltage or current of the power supply, resulting in noise. In addition, if the protection measures of the power supply are not set properly, it may also lead to noise generated by the power supply in abnormal situations. For example, the setting of protective measures such as overcurrent protection and overvoltage protection should be reasonably configured according to the actual situation of the equipment, otherwise it may lead to misoperation or failure, and thus cause noise.

To reduce the impact of power supply noise, we can take the following measures:

Improve the design and manufacturing quality of power supplies, optimize the selection of filtering circuits and components, to reduce the noise level of the power supply itself.

Strengthen the electromagnetic compatibility design of the equipment and reduce the impact of external electromagnetic interference on the power supply.

Reasonably select and implement power management strategies to avoid noise caused by excessively fast or slow power switching speeds and improper protective measures.

In summary, the generation of power supply noise is mainly influenced by the quality of the power supply itself, external environment, and power management strategies. In order to reduce the impact of power supply noise, we need to start from these three aspects and take corresponding measures to optimize and improve.
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