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There are many things in our lives that, after being used for a long time, gradually lose their performance and need to be replaced. For example, in a remote control, the battery’s charge gradually decreases over time as a result of prolonged use, and it needs to be replaced after a certain period. The same is true for frequency conversion power supplies: some of the components inside them need to be replaced after being used for an extended period. For instance, the filter capacitors inside such devices see their performance decline over time, and they also need to be replaced. The technicians at Zhonggang Yangsheng can explain why the filter capacitors in frequency conversion power supplies need to be replaced regularly. What are filter capacitors? A filtering capacitor is a storage component connected in parallel at the output of the rectified power supply circuit, used to reduce the AC ripple coefficient and smooth the DC output. Filter capacitors are used in the rectification circuit of variable-frequency power supplies to remove AC components and make the output DC voltage smoother. Moreover, for precision circuits, a combination of parallel capacitor circuits is often used at this time to improve the performance of the filtering capacitors. Why do the filter capacitors of variable-frequency power supplies need to be replaced regularly? How often should they be replaced? After long periods of use, as the variable-frequency power supply operates, the electrolyte inside the filter capacitors gradually decreases. The normal service life of the filtering capacitor is five years. Meanwhile, frequency conversion power supplies generate a lot of heat during operation, which causes the electrolyte to dry out more quickly; this in turn affects the proper functioning of the frequency conversion power supply. Therefore, in order to avoid any impact on the proper operation of the variable-frequency power supply, it is recommended to conduct a regular inspection once a year. The power supply should be replaced when its capacity decreases by more than 20%, as this helps to ensure its proper functioning.