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In the design of a power supply, the designer must be careful of resonance effects because the ripple voltage could build up to a high value. The components that must be carefully selected are:
first choke and first capacitor
In an LC filter, the first choke and first capacitor can form a series resonant circuit at some frequency. If this resonant frequency is near a harmonic of the ripple, large ripple voltages or currents can occur.
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