Capacitor-input or choke-input filter?

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Capacitor-input filters are typically used in power supplies to smooth out voltage and reduce ripple, while choke-input filters are more effective at handling higher current loads and providing better regulation. For AC mains connected switching power supplies, a combination of chokes and capacitors is often utilized to minimize switching noise and comply with FCC emissions standards. The choice between these filters depends on the specific power source and the need to address potential feed-forward stability issues caused by input noise. Proper filtering is crucial for maintaining performance and regulatory compliance in power supply designs. Understanding the differences and applications of each filter type is essential for effective power supply design.
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Capacitor-input or choke-input filter for power supplies?

Whats the difference and when to use them?
 
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Pagedown said:
Capacitor-input or choke-input filter for power supplies?

Whats the difference and when to use them?

Can you give some examples?

For AC Mains connected switching power supplies, you will generally have a line filter that has both chokes and caps in it. One of the main tasks of the line filter is to keep the switching noise of the power supply out of the AC Mains, in order to meet conducted emissions limits set by the FCC and other governmental agencies.

Depeding on the power source, you may put filtering between the power source and the input to a switching power supply, to help prevent feed-forward stability issues that could be caused by the input noise.
 
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