| 摘要 |
A resonant converter comprises a resonant circuit and a main transformer (T1). An output end of the resonant circuit is coupled to a primary winding of the main transformer. The resonant circuit comprises double winding inductance units (Lr) serially connected separately at two ends of the primary winding of the main transformer. A DC/DC converter using the resonant converter, and a switch power supply. A conventional single resonant inductor is replaced by an integrated inductor formed by two windings which have a same quantity of coils, are connected in reserve phases and act on a closed magnetic circuit. Due to the magnetic coupling function of the two reverse phase windings in the double winding inductors, the effect of parasitic electricity parameters of the main transformer on the charge and discharge of a parallel capacitor (C1, C2, C3, C4) of an electronic switch (Q1, Q2, Q3, Q4) is isolated. In a closed period of the electronic switch, residual energy (Io) of the main transformer and the resonant inductor is equally released to left and right half-bridge arm capacitors by means of the double winding inductance units, and left and right half-bridge arms are simultaneously turned on at a zero voltage. |
