Proposal of a hysteresis control technique with almost constant frequency applied to the three phase boost converter

This paper presents a new control technique with low harmonic distortion for the input power factor correction in a three-phase boost converter. This control technique is similar to the hysteresis control, but the switching frequency is kept practically constant. This technique can be employed since that the converter output voltage is three times greater than the maximum phase neutral input voltage. This paper proposes a wide study on the hysteresis control with practically constant frequency applied to the three-phase boost converter, where simulation results show the current behavior in each phase and the frequency variation along a switching cycle. It is also shown that the switching frequency variation is negligible.