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.
In summary, Cf = 100μF. The two-stage AC/DC converter control strategy is illustrated in ( Fig 6 ). Fig 6. Control strategy of two-stage AC/DC converter. The front-stage PFC circuit adopts a PI double-closed-loop control strategy [ 23 ]. The output voltage, input voltage, and input current were collected as the control variables.
Competing interests: The authors have declared that no competing interests exist. With the development of power electronics technology, high efficiency, high power density, and wide voltage range of AC/DC converter using two-stage circuit structure have become the industry research hotspot.
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