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Old 4th July 2008, 05:27 PM   #1
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Default 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
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Old 4th July 2008, 06:04 PM   #2
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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.
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Old 5th July 2008, 04:13 AM   #3
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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.
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Old 5th July 2008, 05:18 AM   #4
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L1 is a boost inductor with auxiliary bias winding.
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Old 7th July 2008, 05:43 PM   #5
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....which is used to power the PFC chip after initial startup............
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