What is the reason that the duty cycle for Boost Converter should be around 50%?

Dear All,

Thank you so much for your kind suggestions on the design.

Now I have decided to boost 48V to 180V Maximum only. I have selected
150kHz operating frequency for Boost Converter, with inductor 25uA,
3A. And the rated power is supposed to be 250W. My question are:

1. Is the operating frequency and inductor value selected practical?
2. What are the important things to consider for sizing components in
this design?

regards

On Dec 13, 6:34=A0am, Myauk <aungkokot...@gmail.com> wrote:
> Dear All,
>
> Thank you so much for your kind suggestions on the design.
>
> Now I have decided to boost 48V to 180V Maximum only. I have selected
> 150kHz operating frequency for Boost Converter, with inductor 25uA,
> 3A. And the rated power is supposed to be 250W. My question are:
>
> 1. Is the operating frequency and inductor value selected practical?
> 2. What are the important things to consider for sizing components in
> this design?
>
> regards

1, Depends on core losses, switch losses and diode trr
2, Heat

 Most PFC's boost 0 to 141Vdc to 375Vdc with PW>80% for part of the
input AC cycle. The trick is; BW<12Hz to control the dreaded RHPZ.

 Regards,
 Harry