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Why can LC low-pass filter filter square waves into sawtooth waves? How is the ripple generated?
According to the change of Fourier, it is easier to understand. I haven't reviewed Fourier for many years. I remember it should be like this:

Square wave spectrum components are very rich, and the expanded frequency band is very wide; After LC, some high frequencies are filtered out, and the remaining waveforms are more in line with the spectrum components of sawtooth waves; If this is done, the resonant frequency of LC should be required.