In AC-DC and DC-DC converters, the output voltage ripple is one of its many important technical indicators. The output voltage ripple contains both the input power frequency component and the switching frequency component of the converter. For some applications requiring a very low output voltage ripple (VP-P ≤ 10mV), if a general LC low-pass filter design is used, the required large component parameters will result in a large filter size that cannot be satisfied. The requirements for miniaturization of the converter. This paper introduces a ripple suppressor that combines active and passive filters in a reasonable way. It can effectively suppress the ripple and noise in the power supply from a lower frequency (50Hz), and also help to reduce The volume of the converter reduces the weight of the converter.
Ripple suppressor circuit schematic
Active low-pass filter circuit schematic
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