zvs full bridge converter

Thread Starter


Joined Apr 1, 2006
Hai every one.......

i want to build a 1kw float charger ..... i deside to use zvs variable frequency

control full bridge converter to convert 230 V AC to 48 V DC.i reffered some

application notes regarding the full bridge transformer design and the resonant

tank circuit (i want to know how to choose the resonant frequency for the resonant

tank circuit and the tank elements L & C) but still i am not sure about it........

Please give me your valuable suggestions for the transformer and resonant tank

element design, give me a design example i will be very much thankful to you,,.

Please let me know,,,,,,,

Thanks & Regards



Joined May 16, 2005
ISBN 0 8306 1665 9

Power Supplies, Switching Regulators, Inverters & Converters
by Irving M. Gottlieb

Although SMPS seems overkill for a float charger. Why not rectify, filter, and regulate the o/p of a 36vac transformer?


Joined Apr 4, 2006
Hi, I can give you the option of half bridge too, if you want it. I have an Internet group where I have uploaded some files explaining how I have designed and bench tested a version of a half-bridge ZVS circuit that can be done with not a whole lot of only common parts. It uses variable frequency and the LC tank on the secondary side. I have done the concept in LTspice.

One nice thing about ZVS is that the EMI is much lower. I have observed high efficiency as well. I have no plans of ever going back to hard switching for off-line SMPS. I had to throw in my $.02 since I like it so much. :)