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Why boost typology is good for PFC design?

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pfc boost

Hi
I'm a beginner in PFC design.

As I've seen some articles,
almost PFC uses boost topology.
Why?

why boost topology is good at PFC design?

Thanks
regards.
 

boost pfc design

Hello,

typically PFC frontend supplies a DC voltage bus, as it would be supplied by bridge rectifier in non-PFC design. Although a DC voltage bus isn't the only DC/DC converter topology possible, it has many advantages. While the bus voltage equals AC input peak voltage in non-PFC design, it is increased by some amount with PFC, but could be thought equal to peak voltage for simplification.

The bridge rectifier from non-PFC is also present in PFC. Cause the rectified AC input voltage is always below DC bus voltage, only a buck converter can establish an energy flow from AC input to DC bus. As additional condition for a PFC, a sinusoidal current form is tried to achieve.

Regards,
Frank
 

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