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Why does the capacitor or inductor get smaller in SMPS...?

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picotube

picotube

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I heard some people say if the switching frequency used in SMPS is higher, the capacitor or inductor used will be smaller also. Why? Can someone pls explain? Thanks.
 

Re: Why does the capacitor or inductor get smaller in SMPS..

Thr output smoothing capacitor is a reserve of charge. It supplies the load while the switcher output is below the required voltage. The shorter these times are (ie. the higher the frequency) the shorter the time that the capacitor needs to supply the load, hence it does not need to hold as much charge and can be a smaller value.

FoxyRick.
 

    picotube

    picotube

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Re: Why does the capacitor or inductor get smaller in SMPS..

The principle is simple,

if the switching frequency is increased,

for same power output, then the energy

delivered each cycle will be smaller,

so, capacitor and inductor can be smaller.


best regards



picotube said:
I heard some people say if the switching frequency used in SMPS is higher, the capacitor or inductor used will be smaller also. Why? Can someone pls explain? Thanks.
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