Hello All,
I'm looking for guidance. I'm not having any background in power electronics.
I am trying to design an isolated dc-dc converter that will give me a fixed output of 200W at either 48V or12V from a PV panel. My design constraint are the efficiency is about 97% even at minimum power from the PV, for a temperature rise of 20 Kelvin.
Here are my thoughts on working:
Based on various search, I find the resonant circuit to be ideal in conjunction with ZVS and ZCS. I am using the piccolo to control the PWM for the drivers. I'm also setting a switch for selecting 48 V or 12 V output.
Since it is a PV panel, my input will typically vary between 16V - 30V 9V to 18V. One other thing I forgot was the piccolo and other components are also powered from the PV module.
For the 48V side, a boost module will suffice.
7/15: When it comes to 12 V, I was planning to use the 48V boost converter followed by the buck converter. I'm afraid I'll lose out on the efficiency due to the chain of conversion. Is there a better way to do the two output voltages without compromising the efficiency constraints?
Because of the MOSFET devices, my second concern is with rise in temp, even after having the heatsink, when the efficiency will fall below 96%. How do I maintain the minimum efficiency?
7/15: At this time, I have been informed that the end product should be of smaller form factor.
Appreciate your help.
Thank you,
Alex
