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how to increase boost converter efficiency

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ahmed osama

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Dear all

how to increase boost converter efficiency???

what thinks i should i check ??

i need some good books / sites about the boost converter

thanks alot
bye
 

Efficiency is mainly the switches (including rectifiers) and
ESR of filter caps.

Particularly the period where you charge the inductor
with a short to ground, wants to have a nice low impedance
including the ground current return path. The forward
phase wants to not have a diode Vf imposed at high
current, wants to have no reverse recovery charge
slug, and wants the cap it's charging and the cap
it's drawing from, to not be dissipative (the inductor as
well).

It may help you to think in terms of -inefficiency-, whose
component terms are easy to figure and compare against
one another so you get an idea of what matters most.
Efficiency is the end game but not very instructive
tactically.
 

There are quite a few factors depending on how much current, voltage boosting to, switching frequency, and at what point in the loading profile for a given power capability.

Usually, switching device is #1, followed by coil losses. A passive rectifier has between 0.4v and 1.1 vdc drop so whatever your output voltage is, the boost is effectively producing a diode drop above this output. You can do an active syncronous rectifier to reduce this loss. For lower voltage the syncronous rectifier makes more sense since a passive rectifier voltage drop is a higher percentage of output voltage.

Switching frequency decision is complicated mix of factors. The faster you switch a MOSFET, the more driver power is consumed so low end efficiency will suffer. There are methods to mediate this.

A good online presentation is at:

**broken link removed**
 

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