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Buck Converter efficiency

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eegchen

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buck converter efficiency

hi,

Buck converter example.
if we increase the frequency, delta I will decrease, so the delta V will.

But why the efficiency is decreasing?

best
gang
 

buck efficiency

thanks.

why is switch loss increasing in high frequency?
 

efficiency buck converter

Power elements will need more driving current since they need to be turned on faster (Q = I * t), since t goes down cause f goes up, I needs to increase, Q is a "constant" dependent on the power device.
 

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    eegchen

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buck converter efficiency

The power MOSFET gate charge is shuttled once a cycle,
ditto the loss-slug as the FET transitions through the
dissipative region (zero voltage, zero current schemes
are for this). More cycles per second, more joules per
second (i.e. loss watts).
 

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    eegchen

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