Question
Which of the following components are used in a power supply filter network?
Answer Options
- A) Diodes
- B) Transformers and transducers
- C) Capacitors and inductors
- D) All these choices are correct
Correct Answer: C
Explanation
In a linear power supply, the filter network follows the rectifier stage and is responsible for smoothing out the pulsating DC voltage (ripple) into a steady DC voltage. An effective filter network requires components that oppose high-frequency variations while permitting steady DC flow.
The components used are capacitors and inductors. Capacitors are placed in parallel to shunt AC ripple to ground, while inductors are placed in series to block the flow of AC ripple. When used together (forming a Pi or T-network), they provide highly effective filtering, greatly reducing the ripple component and cleaning up the DC output.
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