| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a technique for connecting a floating capacitor Cf1 to a leakage inductance in parallel, by using the leakage inductance of a transformer for a reactor for current resonance, thereby attaining size reduction and cost reduction, in a resonant switching power unit. <P>SOLUTION: This resonance type switching power unit includes a transformer T1 which is equipped with switching elements QH and QL connected in series to an input DC power source Vin and secondary windings S1 and S2 and primary winding P1; a resonance circuit in which the primary winding P1 and a current resonating capacitor Cri are connected in series and which is connected to either of the switching elements; and a rectifier circuit (D1+D2+Co) which is connected to the secondary winding that obtains output voltage Vo. The transformer T1 is equipped with a primary winding P2 which is connected to the primary winding P1, and one terminal of the primary winding P2 is connected to either one terminal of the primary winding P1 or the other terminal thereof and the other terminal is opened. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
