Patent ID: 8294215
Filing Date: 2012-10-23
Classification: H01L,H02M

Abstract:
1. A low-voltage power supply, wherein said low-voltage power supply comprising: a semiconductor substrate of a first conductivity type; at least two semiconductor regions of a second conductivity type underneath a first main surface; a heavily doped semiconductor region of said first conductivity type between said two semiconductor regions of said second conductivity type being not directly contacted with said two semiconductor regions of said second conductivity type; when said two semiconductor regions of said second conductivity type have reverse-biased voltage with respect to said substrate, and the depletion region of said substrate reaches said heavily doped semiconductor region of said first conductivity type, said heavily doped semiconductor region of said first conductivity type has a neutral region, called as clamped region, to form a terminal of said low-voltage power supply; the potential of said clamped region is different from any neutral region in said two semiconductor regions of said second conductivity type, and also different from said neutral region of substrate; said any neutral region can form another terminal of said low-voltage power supply according to requirements; said semiconductor substrate of said first conductivity type is contacted or not contacted to a heavily doped semiconductor layer of said first conductivity type on a second main surface.