- It is assumed
that the design will use some kind of "Soft
Switching", and/or "Low Losses/Non
Dissipative Snubbers". Today, for a new,
competitive design, just using "Hard
Switching" is no longer an option.
- We believe that
choosing the switching frequency must be done
at the beginning of a new design, taking in
consideration: power level, cooling method,
application specifics.
- Power levels 0-50W:
any switching frequency between 100kHz and 1MHz
may be a good choice, depending of application.
- Power levels 50W-500W:
best choice would be between 200kHz and 500kHz.
Use 200kHz for a higher efficiency and 500kHz for
a higher density and easier filtering.
- Power levels 500W-5kW:
best choice would be between 100kHz and 200kHz.
Use 100kHz for a higher efficiency; otherwise 200kHz
is the best choice.
Choosing a much
different switching frequency than those suggested above,
may work for a while, but soon you will discover that
your competitor has a product with a higher power
density, or better efficiency. Do not find out too late.
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