Abstract
In boost power factor correction (PFC) converters, a low-pass filter (LPF) is generally adopted to eliminate the influence of the double-line frequency output voltage ripple on the controlled input current, which, therefore, limits the outer-voltage loop bandwidth. Different from the existing alternative schemes to the LPF, which eliminate the influence of the output voltage ripple using output-feedback ways in the outer-voltage loop, this article proposes a current feedforward scheme in the inner-current loop to remove the LPF. In the proposed scheme, the harmonic distortion of the reference current is suppressed by using a current-harmonic feedforward compensation way in synchronous reference frame. Finally, a 225-W experimental prototype is built with digital implementation, and the experimental results show a more than 68% improvement of the dynamic response for the case with the proposed scheme as compared with the traditional LPF scheme, along with a high-quality controlled current.
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