The primary role of filter capacitors in power supplies is to?

The primary role of filter capacitors in power supplies is to reduce noise. Filter capacitors are used in power supply circuits to smooth out variations in voltage and to minimize ripple, which is the alternating current (AC) voltage that rides on top of the direct current (DC) voltage. When power supplies convert AC to DC, there can be fluctuations in voltage due to the nature of the rectification process. Filter capacitors help to stabilize these voltage variations, allowing for a cleaner and more consistent DC output.

By storing and releasing charge, filter capacitors effectively filter out high-frequency noise and ripple, thus improving the overall performance and reliability of electronic circuits. This is particularly important in sensitive electronic equipment where noise could lead to malfunctions or degraded performance.

The other options do not accurately describe the primary function of filter capacitors. While they do not boost voltage, regulate current, or increase frequency, their main function is to enhance the quality of power supply outputs by reducing unwanted noise and ripple.