SWITCHING POWER SUPPLY DEVICE

摘要

In conventional multi-output switching power supply device, since power is supplied from an output terminal on a relatively high voltage side to an output terminal on a relatively low voltage side through a dropper circuit, which generates a relatively large power loss, so as to improve the voltage accuracy of the non-stabilizing output terminal, power supply efficiency is low and heat generated from the dropper circuit is high.  One direct current power supply among a plurality of direct current power supplies on the secondary side is a stabilizing output terminal (24V output terminal (TM3)) having a voltage stabilizing means which stabilizes the output voltage by feeding back the output voltage to a primary side control circuit (4), and the rest of the direct current power supplies are non-stabilizing output terminals (12V output terminals (TM4)) not having a voltage stabilizing means which feeds back the output voltage to the primary side.  An up/down converter is provided between the output terminal of the non-stabilized output and the output terminal of the stabilized output and power is applied/received between the output terminals corresponding to the non-stabilized output voltage, thus, the voltage accuracy of the non-stabilizing output terminal is improved.