| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for starting up a DC-DC conversion circuit by which an output voltage V<SB>0</SB>can be prevented from overshooting and body diodes of switching elements can be prevented from reverse recovery. SOLUTION: In the start-up method, phases of gate signals of third and fourth switching elements are gradually shifted with respect to the gate signals of first and second switching elements. With an increase of the phase shift, a voltage vt1 on a primary side of a transformer 9 also increased, and an output voltage V<SB>0</SB>also increases. COPYRIGHT: (C)2011,JPO&INPIT |
