Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Pi Filter vs. RC filter. Difference and comparison

Status
Not open for further replies.

Jonesy

Junior Member level 1
Joined
Mar 17, 2011
Messages
19
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,423
What's the difference btw pi-filter(choke replaced as resistor) and an RC filter?

The pi-filter is used as a filter after a rectifier to a positive linear regulator 7805
(a 240Vac to 5V DC project)

Does the pi-filter increases the inrush current as the first cap charging current is not reduced by any resistor while a simple RC filter has the resistor before the cap?

Using a multisim simulation without the PI-filter, the inrush current is less. using just a RC capacitor input filter, I can use a lower VA transformer for rectification and same max load.
 

but the current consumed is much lesser right?
 

The peak current is much lower. You should start of with a design , say 12V at 1A with less then 10mV of ripple. Now compare the two circuit, because as I said one uses more current, the other more voltage. For virtually all applications people use just a big reservoir capacitor, or follow it with an IC regulator.
Frank
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top