摘要 |
<p>An improved valley-mode switching (VMS) scheme and circuitry for implementing the improved VMS switching scheme in a switch-mode power converter are disclosed. For a given switching cycle, a desired switch turn-on time is determined based on a pulse width modulation, pulse frequency modulation, or other suitable power converter control scheme. Also, one or more times corresponding to local minimums (valleys) are predicted for the voltage across a power switch of the switching power converter. The power switch is turned on at a valley immediately subsequent or otherwise subsequent to the desired switch time determined according to the power converter control scheme. Thus, the improved VMS scheme enables low-voltage switch operation to reduce switching loss and EMI noise without restricting the control scheme of the power converter.</p> |
申请人 |
IWATT INC.;LI, YONG;BUI, HIEN, HUU;ZHENG, JUNJIE;KESTERSON, JOHN, WILLIAM |
发明人 |
LI, YONG;BUI, HIEN, HUU;ZHENG, JUNJIE;KESTERSON, JOHN, WILLIAM |