Common mode choke as boost inductor

jegandren · 4th July 2008, 05:27 PM

Hi all,

Can i use a common mode choke 1mH as a boost inductor for my power factor controller.

Many Thanks

Eva · 4th July 2008, 06:04 PM

Consider that 1mH is the common mode inductance, and that it will saturate at a very low current. The leakage inductance (differential mode) is much lower, like 5uH to 50uH only, and it's air based so it won't saturate but it will produce an undesirably strong leakage flux. You need a dedicated boost inductor.

jegandren · 5th July 2008, 04:13 AM

Just to confirm, actually im not very sure the L1 in the circuit attached is a common mode choke or a boost inductor. please advise.

wrenchone · 5th July 2008, 05:18 AM

L1 is a boost inductor with auxiliary bias winding.

N-Channel · 7th July 2008, 05:43 PM

....which is used to power the PFC chip after initial startup............

4th July 2008, 05:27 PM	#1
jegandren diyAudio Member Join Date: Feb 2008	Common mode choke as boost inductor Hi all, Can i use a common mode choke 1mH as a boost inductor for my power factor controller. Many Thanks

4th July 2008, 06:04 PM	#2
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Consider that 1mH is the common mode inductance, and that it will saturate at a very low current. The leakage inductance (differential mode) is much lower, like 5uH to 50uH only, and it's air based so it won't saturate but it will produce an undesirably strong leakage flux. You need a dedicated boost inductor. __________________ I use to feel like the small child in The Emperor's New Clothes tale

7th July 2008, 05:43 PM	#5
N-Channel diyAudio Member Join Date: Mar 2003 Location: Sol System	....which is used to power the PFC chip after initial startup............ __________________ -. ---.. -..- ---

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5th July 2008, 05:18 AM	#4
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	L1 is a boost inductor with auxiliary bias winding.

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