inductor calculation help for buck convertor

Thread Starter


Joined Mar 8, 2011
hey guys i am going to design a battery charger using buck topology my input voltages are 385 volts dc and output would be 108-145 volts DC since ineed to charge a battery back of 10 batteries with atleast output current of 9AMPS will this topology work if not then should i go for isolated topology and i need help on the selection of inductor value vin-vout=L di/dt there is question mark on what value of vout should be kept and how to select dt


Joined Apr 5, 2008

Where does the 385 Volts DC come from?
Is it from the mains?
If so, use a transformer to lower the voltage.
Power supplies directly feeded from the mains CAN NOT be made safe.