Soft Switching od step-down converter- help needed

[gilbertomaldito]

Soft Switching

Please help, I need soft switching for my (dc-dc)step down/buck converter. but I would like to retain my original buck converter which has one power NMOS and one Power Diode.

Usually from soft switching I have seen so far are composed of 2 MOS's. But I need to retain my Diode and Mos.

Please help.

 

[dick_freebird]

You already have (sort of) what a soft-switching converter
would do. Soft switching refers to letting the output travel low
using the inductor's current, rather than hard-banging it with
the low side FET (in a synchronous-rectified scheme).
That happens for free, in a diode-low-side-switch buck.

 

[gilbertomaldito]

Hi ****_free****,

Can you help me how to improve this Soft Switching, my professor told me to add soft switching in my current mode-Buck converter.
Is there anything I need to put/attached devices in my circuit? Can you give me a good idea, or just a basic SS circuit to attached to my buck.

When you mentioned that I have SS already in my buck converter because I have a 1 MOS and 1 ultra-fast diode, you mean, I dont need to add more devices to improve my SS?

Do you have papers, or books?

SOrry, my response is quite long and I asked too much question...
Please help.

 

[skowe26]

Hi,

Try reading about Zero voltage switching buck converters.

Hope this helps.

Regards.

 

[gilbertomaldito]

I did that already, but they just discussed about 2 MOS switches (for basic buck converters).

Mine is 1 Mos and 1 diode current mode buck... Do you have any idea about this? I was asked to implement SS for this kind of buck structure. But I just dont know how. any papers you recommend?