Sliding Mode Pulsewidth Modulation (SMPWM) for nine-switch converter

Nine-switch converter, which can provide two sets of three-phase outputs with independent amplitudes, phases and frequencies, has been proposed to replace two independent three-phase converters for cost- and size-reduced purposes. This paper proposes a hysteresis-modulation (HM) sliding-mode (SM) pulsewidth modulation (PWM) for the nine-switch converter. With the proposed HM-SMPWM, the phase currents of the two sets of outputs can track to their current references directly. To do this, decoupled sliding surfaces for the two sets of outputs are structured; based on the sliding surfaces, the proposed SMPWM are detailed explained; the operational range is also discussed; finally the experiments are carried out to confirm the effectiveness of analysis.