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100% efficiency for SMPS? How?

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iVenki

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I came across this sentence which I couldn't understand at all. Help me

" Ideal switching elements (e.g., transistors operated outside of their active mode) have no resistance when "closed" and carry no current when "open", and so the converters can theoretically operate with 100% efficiency (i.e., all input power is delivered to the load; no power is wasted as dissipated heat)."


I also would like know the formula for efficiency.
Whether it is output power by input power or output voltage by input voltage?
Because I saw "output voltage by input voltage" in some books but I believe it is power. Which one is correct?
Thanks in advance.
 

An ideal switch will be characterized by infinitely fast switching from [on] to [off] and from [off] to [on], it also will have zero resistance when switched [on] and open circuit when switched [off] ..
No power is wasted to control an ideal switch ..

Real switch has internal resistance when on and leakage when off, transitions on-off and off-on take some time and here is certain amount of power lost in the control signal that drives a switch ..

So,
Efficiency = [ output power / input power ] * 100%

IanP
:wink:
 

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