| 摘要 |
<p>A drive circuit (3) for a switching power supply comprises drive elements (11, 12) for generating a drive signal (SD), and a transformer (15) including a primary winding (15a) to receive the drive signal (SD) through a capacitive element (14) and a secondary winding (15b) to supply the drive signal (SD) to a main switching element (21). To protect the main switching element (21) against damage while expanding the range of switching control, the drive circuit (3) for a switching power supply includes an inductive element (16), which has an inductance value smaller than the excitation inductance of the primary winding (15a) and cooperates with the capacitive element (14) to form a series resonance circuit.</p> |
