| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power supply unit capable of improving power failure retention time without need for upsizing the unit. <P>SOLUTION: The power supply unit (10), having a step-up type power-factor improvement circuit (30), includes a control section (60) for controlling circuit constants (3601, 3602) of a feedback control system or a reference voltage system provided in the power supply unit to increase an output voltage (E<SB POS="POST">O</SB>) of the power-factor improvement circuit (30) when a load of the power supply unit increases. <P>COPYRIGHT: (C)2013,JPO&INPIT |
