| 摘要 |
PURPOSE:To stabilize output voltage easily by generating two sets of AC voltages through switching of DC voltage, individually rectifying and smoothing the AC voltages through chokes having a common core, and controlling the switching operation based on the outputs from both rectifying circuits. CONSTITUTION:A DC power supply 1 is switched through a transistor Tr 3 and the current flowing through the primary winding 5a of a transformer 5 is turned ON/OFF thus generating predetermined high frequency voltages in the secondary windings 5b, 5c. Thus generated voltages are then rectified, respectively, through rectifiers 7, 9 and 15, 17 followed by smoothing 25, 27 through chokes 11, 19 and capacitors 13, 21 and fed to a load. The chokes 11, 19 are formed by winding coils around a common core and the outputs from the smoothing circuits 25, 27 are fed to a control circuit 23 in order to turn the Tr 3 ON/OFF. Voltage fluctuation of the smoothing circuit 25 is transmitted through the choke coils 11, 19 to the smoothing circuit 27. Consequently, output voltage of the smoothing circuit 25 is stabilized easily. |
