| 摘要 |
PURPOSE: To increase the capacity by connecting an inductance and the control winding of power factor improving transformer in series between a full-wave rectifier and a smoothing capacitor and connecting the primary winding of power factor improving transformer in parallel with the primary winding of main transformer thereby dividing the transformer. CONSTITUTION: When a switch element 34 is turned on, a current 11 flows through the control winding 31 and primary winding 28 of a power factor improving transformer 27' into the switch element 34 and the energy of an AC commercial power supply 20 is stored in an inductor 26. Furthermore, a current 12 from a smoothing capacitor 32 flows through the primary winding A1 of a main transformer A into the switch element 34 while storing energy in the primary winding A1. When the switch element 34 is turned off, energy stored in the main transformer A is fed through a rectifying/smoothing circuit 45 to a load and a current flows from the inductor 26 into the smoothing capacitor 32 through the control winding 31 of a power factor improving transformer 27'. |
