AdvancedA-004-002-001
Filter chokes are rated according to:
C
Answer
Measurements and troubleshooting
Type
A
power loss
B
breakdown voltage
C
inductance and current-handling capacity
D
reactance at 1000 Hz
Answer Notes
A filter choke is an inductor used primarily in power supply filter circuits to smooth out the ripple current from a rectifier. To be effective, the choke must provide a specific amount of opposition to alternating current ripple, which is determined by its inductance (typically measured in Henrys).
Additionally, because the entire DC output current of the power supply flows through the choke's windings, it must be constructed with wire thick enough to handle that current without overheating. High current can also cause the magnetic core to saturate, which drastically reduces its effective inductance.
Therefore, filter chokes must be rated by both their inductance and their maximum current-handling capacity. Ratings like breakdown voltage apply primarily to capacitors, while reactance at 1000 Hz is relevant for audio frequency chokes rather than power supply mains filtering.
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Which of the following circuits gives the best regulation, under similar load conditions?