What does the filter section of a power supply do?

The filter section of a power supply plays a crucial role in the conversion process, specifically in smoothing out pulsating Direct Current (DC) after it has been rectified from Alternating Current (AC). When AC is converted to DC, the output doesn't provide a steady level of current; instead, it results in a ripple effect – a variation in voltage over time. The filter section removes or reduces this ripple, allowing for a more stable and consistent DC output. This is essential for most electronic devices and circuits, as they require a steady voltage without fluctuations to function properly.

By using components like capacitors and inductors, the filter effectively "smooths" the pulsating DC, resulting in a level of output that is more suitable for powering electronic devices. Thus, the filter section is vital for ensuring the reliability and performance of electronic systems that rely on a power supply.