公开(公告)号：EP0720277A4

公开(公告)日：1996-04-01

申请号：EP93921060

申请日：1993-09-22

申请人： TOSHIBA KK

发明人： SATOH MORIO ,  MOMOSE KENICHIRO ,  SAITO TADAO ,  KUSAKA TAKAO

IPC分类号： H02M1/34 ,  H02M3/335 ,  H02M3/338 ,  H03K17/0814 ,  H03K17/082 ,  H02M3/28 ,  H01F27/24

CPC分类号： H02M1/34 ,  H02M3/335 ,  H02M3/338 ,  H02M2001/348 ,  H03K17/08142 ,  H03K17/0822

摘要： A snubber circuit has a saturable inductor formed out of amorphous alloy and others connected in series to the driver of a switching element. A switching power-supply is either of a flyback self-excited type or of a separately excited type, and is provided with a saturable inductor connected in series between a switching element connected in series to the primary coil of a transformer and a driving circuit which operates this switching element. This saturable inductor enhances the efficiency and suppresses noises, and is used for the above-mentioned snubber circuit and switching power-supply. The exciting current Iex is less than 3(A), and the magnetic flux Ζ (Wb/m2) is within 2 to 20 % of the product of the operation cycle T(sec) by the circuit voltage E(V).