LC Filter for 2.69V 250Hz AC to Pure DC: Capacitor and Inductor Value Selection

A designer working with a 2.69 V, 250 Hz AC source has successfully rectified the AC input to pulsating DC but struggles to achieve a pure DC output using an LC filter. The discussion clarifies that rectification requires a diode and capacitor stage before filtering. It is recommended to place a smoothing capacitor immediately after the diode rectifier to reduce ripple significantly, followed by an LC or pi filter if further smoothing is needed. High ripple levels suggest the need for improved capacitor quality; using tantalum capacitors or paralleling different capacitor types can enhance high-frequency smoothing performance. Additionally, considerations for inrush current and surge protection at turn-on are important for capacitor and rectifier longevity. Implementing these suggestions resulted in successful ripple reduction and a more stable DC output.
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