Harmonics Cancellation of Boost Converters Based on Two-Phase Sliding Mode

This paper proposes a novel harmonics cancellation approach for DC-DC boost converters by using two-phase sliding mode (SM). On the concept of multiphase SM and hysteresis modulation (HM), the circuit topology of boost converter is extended into two parallel channels so that the two phase SM controllers can be applied for the direct ON/OFF control of converters. The trajectory of system state is analyzed in the neighbourhood of equilibrium state, and the influence relationship between the HM width and harmonics is determined. Finally three cases are considered and the cooperation strategy of the two SM controllers are deduced for the quantitative harmonics cancellation. Simulations validate the proposed approach.