The larger the filter capacitor, the better the filtering effect? |Focus on mid-to-high-end brand capacitor manufacturers

First, clearly tell you that this statement is not correct! In theory, it seems that the larger the filter capacitor, the better the effect, but this is not the case in practical applications. Because when the filter capacitor reaches a certain threshold, its improvement effect is hardly any improvement. The more serious problem is that if the filter capacitor is too large, the power on and off time will be prolonged, which may cause other digital devices such as MCU power-on reset failure. This kind of failure is more common in single-chip microcomputers and liquid crystal displays. After the filter capacitor is enlarged, the output voltage will also become higher, and the instantaneous charging current at startup will become larger, but after low-frequency AC rectification, a larger capacitor is required to filter cleanly, so the size of the filter capacitor still depends on the choice Your demand for load ripple, therefore, the filter capacitor should still be selected based on the principle of just enough and just enough.

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