Patent ID: 10050544

Abstract:
A ultra-high power ZVS+ZCS integrated soft switching DC/DC converter is disclosed, which adopts a phase shifted full bridge ZVS (zero voltage switching) DC/DC converter circuit. A saturation inductance Lk=Lk1+Lk2 controlled by a load current is series connected to a primary side of a high permeability ring transformer. A RCD buffer circuit for ZCS (zero voltage switching) current zero-crossing switching off is connected to a secondary side of the transformer. When a lead arm commutates, a refringence of a load current is blocked; the ZVS (zero voltage switching) is ensured; exciting current disappears; a lag arm realizes ZCS zero current commutating. The controlled inductance LK assists to establish a corresponding load refringenced current and the exiting current and recovers electromagnetic induction; The RCD buffer circuit softens the reverse current of bridge rectifier and oscillations caused by the leakage inductance on secondary side of the transformer and the buffer capacitor are attenuated.