I'm new to power electronics and I want to build a multiple input dc-dc converter. my problem is i don't know where to start, the specs that i have is that i have to output a 190VDC with an input ranging from 12-24V. for switching frequency of the switches i have to choose that spec for myself but i don't know how to. can someone refer me to some documents i can read to familiarize myself with the design of this converter