Switching Mode Power Supply... my new frontier...

Ever since I started playing with electronics, I have never ventured into switching mode power supply (SMPS) arena... Linear regulators have served me fine since my projects are low power and low voltage.

For my new project, still in development, I needed to charge a large capacitor bank to 400V. More over, it needed to be portable thus ruling out the use of mains transformer. So, with it, I have to learn all the complexity of SMPS. Below is my test board... so far working but require significant fine tuning to improve efficiency and charging speed.