| 摘要 |
<p>According to one embodiment, a switching power supply device includes a direct-current power supply (DC) and a switching operation conversion circuit (SC). The switching operation conversion circuit (SC) is connected to the direct-current power supply (DC), and includes an inductor (L1), a switching element (Q1), a diode (D1), a gate drive circuit (GD), an input end and an output end. The switching element (Q1) allows an increasing current to flow to the inductor (L1) from the direct-current power supply (DC) at an on time. The diode (D1) allows a decreasing current to flow to the inductor (L1) at an off time of the switching element (Q1). The gate drive circuit (GD) turns on the switching element (Q1) and when the increasing current reaches a saturated state, the gate drive circuit controls a gate voltage of the switching element (Q1) and turns off the switching element. The input end is connected to the direct-current power supply (DC) . The output end is connected with a load.</p> |
