| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a stable output current by reducing a ripple ratio in a switching power-supply circuit provided with at least two switching circuits including a switching element and a diode.SOLUTION: A switching power-supply circuit comprises: a switching circuit 3a having a reactor L1, a diode D1, and a switching element S1; a switching circuit 3b having a reactor L2 having a smaller inductance than the reactor L1, a diode D2, and a switching element S2; and a control section 5 controlling the switching operation of the switching element S1 and the switching element S2. When the switching frequency of the switching element S1 is f1 and the switching frequency of the switching element S2 is f2, the control section 5 controls the switching operation so that the switching frequency f2 is larger than the switching frequency f1.</p> |
