| 摘要 |
PROBLEM TO BE SOLVED: To obtain the optimum zero-voltage switching by selecting the values of the equivalent inductances of positive- and negative-side routes, connecting the first connecting point between main switch elements and the second connecting point between smoothing capacitors, so that the voltage of a discharge-side resonance capacitor can become zero or negative at the time of commutation. SOLUTION: The values of equivalent inductances of positive- and negative- inductances Lf' connecting points P1 and P2 are selected so that the voltage of a discharge-side resonance capacitor can become zero or negative at the time of commutation. The inductances Lc in smoothing capacitors CD1 and CD2 and inductances around main switch elements S1 and S2 are not able to change freely, even when they exist, and the values of the equivalent inductances Lf' are decided within such a range that the optimum values of the positive- and negative-side equivalent inductances Lf are large than (Lc+Ls). More specifically, a conductor having the inductance value of [Lf-(Lc+Ls)] is used. |
