Double-Line Frequency Ripple Suppression for Boost Converters in Laser Drivers with Input Voltage Prediction

The laser driver is an important part of the laser system, most of which use Boost converter to charge the energy storage capacitor. The input voltage of Boost converter is usually provided by the AC network through 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 paper. 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.