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3b : Boost Converter
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BOOST CONVERTER OR STEP-UP CONVERTER

Boost converter steps up the voltage. That is, Vo > Vin. The circuit diagram is shown below:

When S1 turned ON, current in the inductor increases, storing energy into it.

Vd*ton/L=∆i

(Vd-Vl)*toff/L=∆i                 i is the current flowing through the inductor 

 

This can be rearranged as

and for a lossless circuit the power balance ensures

The above relationship between input and output voltages is valid only on an average basis. The typical waveforms for boost converter are shown below:

The ripple in the output voltage will be decreased if the filter capacitor value can be increased.

 

 

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