IS NEW TECHNOLOGY ? half bridge soft switch power work in P

[alphi]

at present,most half bridge soft switch power work in PFM,not PWM,and must have some load. such as MC34066¡¢UC1864 etc,
now I want to design one soft switch power(ZVC or ZVS) work in PWM,and output current can modulate from 0A to full load.but I can not find any smps IC or example circuit working in PWM/0-load.

who can send me some reference for it.
thank you very much!

 

[alphi]

who can help me?

 

[riz_aj]

Alphi,

It has been sometime since I left power supply design.

To get started I think you can visit Unitrode(now part of TI) website. They have excellent papers on this ZVS and ZCS.

**broken link removed**

Hope this helps.

 

[alphi]

hi,friend ,thank you .

but IT web also have not PWM soft switch in half bridge, that only have PFM zvs and ZCS