| 摘要 |
A high-frequency isolation alternating current (AC)-direct current (DC) conversion circuit and control method thereof. The conversion circuit comprises: an AC source (V1), a DC source (V2), a DC-side synchronous switch (400), high-frequency isolation transformers (TRA, TRB), DC-side high-frequency inverter bridges (100, 200), resonant inductors (L2, L3, Lr), resonant capacitors (C3, Cr), a high-voltage energy storage filter capacitor (C), an AC-side inverter bridge, and an output filter (C2). Using a preset DC-side voltage as baseline, a circuit is switched between two operating modes of rectification and inversion according to an external voltage reference and by different open operating modes of the inverter bridge, and achieving soft switching by a resonant mode of a high-frequency inverter bridge topology, thereby reducing switching loss, facilitating an increase of operating frequency or an increase in efficiency of an inverter circuit, thus increasing power density and reducing volume. DC voltage inversion in a wide range is achieved by open timing control of the high-frequency inverter bridge, thus obtaining high efficiency in applications with wide voltage variation ranges such as batteries, etc. |
