Patent ID: 8102166
Filing Date: 2012-01-24
Classification: H02M

Abstract:
1. A power source device comprising: a switching section switching an input voltage supplied from a power source section to a load section; a smoothing inductor section smoothing and outputting an output current to be supplied to the load section in accordance with a switching operation performed by the switching section so as to stably output a specific output voltage to be supplied to the load section; a first inductor section decreasing an output inductance value of the smoothing inductor section in accordance with electromagnetic induction between the first inductor section and the smoothing inductor section; a second inductor section increasing the output inductance value of the smoothing inductor section in accordance with electromagnetic induction between the second inductor section and the smoothing inductor section; an electromagnetic induction activating section activating the electromagnetic induction between the smoothing inductor section and the first inductor section or the electromagnetic induction between the smoothing inductor section and the second inductor section; a load current fluctuation detecting section detecting a steeply increasing fluctuation or a steeply decreasing fluctuation in a load current on a side of the load section; and a control section controlling operations of the electromagnetic induction activating section so as to activate the electromagnetic induction between the smoothing inductor section and the first inductor section when the load current fluctuation detecting section has detected the steeply increasing fluctuation in the load current, and controlling operations of the electromagnetic induction activating section so as to activate the electromagnetic induction between the smoothing inductor section and the second inductor section when the load current fluctuation detecting section has detected the steeply decreasing fluctuation in the load current.