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Two Average current mode Boost PFCs in parallel.?

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Flyback

Well-Known Member
Hi,
The attached (LTspice and jpeg) shows two Average current mode Boost PFC’s in parallel, and with all the “gubbins” that’s needed to facilitate this. (only 200W, because its purely a demo)

The secret is in the copying over of the Masters MOUT pin voltage over to the slave.

It also needs to use current sense transformers, and hence the duty cycle clamp cctry , which limits duty cycle to 0.9max, allowing the current sense transformers to always get reset.

Can you think of a lower component count way to do this?
 

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  • LT1248 Boost PFC plleld_DCclamp.asc
    34.4 KB · Views: 160
  • Two Boost PFCs in parallel.jpg
    Two Boost PFCs in parallel.jpg
    195.3 KB · Views: 159
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