Boost converter is widely used in DC power supply system. Its input
voltage is often provided by AC power grid through an uncontrolled
rectifier bridge. Due to that, there is obvious double-line frequency
ripple especially in DC input voltage and inductor current. To solve
this problem, a PI regulator with DC input voltage prediction is
proposed in this letter. The reference duty cycle is calculated by a PI
regulator, and then it is modified by the prediction. To predict well,
the quadratic interpolation method with error correction is adopted. The
effectiveness of the proposed method on double-line frequency ripple
suppression is verified by experimental results.
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