Help understanding the quadratic boost converter -single switch

Thread Starter

Santa klaus

Joined Nov 16, 2014
I am familiar with the operations of a boost converter. However, i came across this circuit called a quadratic boost converter and i haven't really understood it.
When the Switch is ON (Mode), diode 3 is reverse biased because its anode is at at ground potential, while its cathode is below ground.
But i don't see why diode 1 is reverse biased too.
Similarly, when the Switch is OFF (Mode 2) , diode 2 is reverse biased and i don't understand why.
upload_2016-11-16_20-9-31.png upload_2016-11-16_20-9-50.pngupload_2016-11-16_20-10-8.png