Below is a boost converter with its inductor current waveform operating in DCM. The voltage conversion ratio of the converter is as follows:
M(D1,D2) = V/Vg= 1 + D1/D2
where V and Vg are output and input voltage respectively.
From the formula we see that there are two ways to increase the conversion ratio:
- Increase D1.
This makes sense because the longer the D1 the more energy is stored in the inductor in the time period.
- Decrease D2.
I couldn't explain it intuitively or physically how it is so. When D2 is decreased, how does it affect output voltage intuitively or physically?