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-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.