The front stage of the AC/DC converter is a power factor correction circuit, which can improve the power factor and reduce grid-side current harmonics. Its performance affects the utilization of grid energy and control effect of the rear-stage DC/DC converter. Current research on PFC circuits mainly focuses on Boost and its improved circuits.
With the continued development of the new energy vehicle industry, two-stage isolated AC/DC converters are widely used because of their simple topology and easy control characteristics. In this study, we investigate the front-stage Buck power factor correction (PFC) converter and rear-stage full-bridge converter.
The AC/DC converters run at fixed apparent power but the power factor will change, thus leading to PFC, inverter, capacitive and inductive behavior. Figure 34 depicts the four quadrants’ operating points of a three-phase inverter for a symmetrical system.
The converters will switch at different switching frequencies, but always with the aim to keep 130 W dissipated by the active components. The AC/DC converters run at fixed apparent power but the power factor will change, thus leading to PFC, inverter, capacitive and inductive behavior.
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