The efficiency of filter is greatly improved, and the capacity and volume of filter capacitor are greatly reduced. For example, if the operating frequency of the switching power supply is 25 kHz, which is 500 times of the frequency of the linear regulated power supply (25000 / 50 Hz), the capacity of the filter capacitor can be reduced by 500 times correspondingly, which reduces the volume and weight of the components in the filter circuit, and also saves the cost.<br>
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