Boundary control of DC-AC inverters using ripple-derived switching surface

Boundary control has the advantages of fast dynamical response and accurate steady-state regulation when applied to power converters. However, it has the drawback of wide variation in switching frequency and the situation becomes more severe when it is applied to DC-AC inverters. This paper provides a thorough study into this problem and proposes an enhanced boundary control method to restrict the switching frequency variation. Boundary control with ripple-derived switching surface is proposed and implemented in a DC-AC inverter. Experimental results show that the proposed method is capable of limiting the switching frequency variation while maintaining the characteristics of fast dynamical response and accurate steady-state regulation.