Multi-output switching power source apparatus

A multi-output switching power source apparatus comprising:

• a DC power source;
• a transformer having a primary winding and at least one output winding;
• a main switching circuit for converting the voltage of said DC power source into an AC voltage by repeating ON/OFF operation and for inputting the voltage to said primary winding of said transformer;
• a first secondary switching circuit connected to said primary winding and turning ON/OFF complementarily with said main switching circuit in order to rectify an AC voltage induced across said primary winding;
• second to (n+1)th (n:
• a natural number) secondary switching circuits connected to said first to nth output windings of said output windings and turning ON/OFF complementarily with said main switching circuit in order to rectify AC voltages induced across said first to nth output windings;
• first to (n+1)th smoothing circuits for smoothing voltages rectified by said first to (n+1)th secondary switching circuits and for supplying first to (n+1)th DC output voltages to first to (n+1)th loads;
• and
• a control drive circuit for turning ON said first to (n+1)th secondary switching circuits after said main switching circuit is turned OFF, for turning ON said main switching circuit after said first to (n+1)th secondary switching circuits are turned OFF, for detecting one of said first to (n+1)th DC output voltages, and for adjusting the ON period of said main switching circuit and the ON periods of said first to (n+1)th secondary switching circuits to stabilize the DC output voltage.