A novel carrier-based PWM without narrow pulses applying to high-frequency link matrix converter

In order to eliminate narrow pulses completely, this paper presents a novel carrier-based pulse width modulation (CBPWM) strategy applying to high-frequency link matrix converter (HFL-MC). Following the De-Re-couple idea, a single-phase to three-phase MC is equivalent to two full-bridge inverters according to the polarity of input voltage. The voltage of switches in two full-bridge inverters is analyzed and derived the duty cycles of switches according to the relationship between the state and the voltage of the switch. The duty cycles of three phases in the two inverters are integrated into a unified expression to generate the final modulation waves. A dual modulation strategy is proposed to compare modulation waves and a triangular carrier, which can achieve almost constant duty cycle of gating signals regardless of output voltage change. Therefore, the narrow pulses are eliminated fundamentally. Finally, the experimental results are given to show the advantages and the effectiveness of the proposed modulation strategy.