| 摘要 |
PROBLEM TO BE SOLVED: To provide a switching power supply capable of lowering the operating point of an output smoothing choke coil more than the conventional types. SOLUTION: In a rectifying-smoothing circuit 4, a rectifying diode 41 is disposed between one ends (connection point P41) of a secondary winding 321 and a choke coil Lch1 and one end (connection point P44) of an output-smoothing capacitor Cout; while a rectifying diode 42 is disposed between one ends (connection point P42) of a secondary winding 322 and a choke coil Lch2 and the one end (connection point P44) of the output-smoothing capacitor Cout. The other ends (center tap CT) of the secondary windings 321, 322 are connected to one end of a choke coil Lch0, and the other ends (connection point P43) of the three choke coils Lch0-Lch2 are connected to the other ends (connection point P43) of the output-smoothing capacitor Cout. Thus, the amount of electric current controlled by the individual choke coils is reduced. COPYRIGHT: (C)2011,JPO&INPIT |
