High-order LCLCL direct-current converter based on harmonic optimization and parameter design method

The invention discloses a high-order LCLCL direct-current converter based on harmonic optimization and a parameter design method, and belongs to the field of power supply power converters. The invention aims to solve the problem that the LLC resonant converter needs to be subjected to frequency conversion control to realize stable voltage output, and the efficiency is reduced. The converter comprises a band-stop filter inductor and a band-stop filter capacitor which are connected in parallel to form a band-stop filter. The drain electrode of the switch tube S1 is connected with the positive electrode of the power supply, the source electrode of the switch tube S1 is connected with the drain electrode of the switch tube S2, and the source electrode of the switch tube S2 is connected with the negative electrode of the power supply. The resonant capacitor, the resonant inductor, the primary side of the transformer and the band elimination filter are sequentially connected in series between the drain electrode an