No abstract

No abstract

A new multi-frequency small-signal control model for high-bandwidth DC buck regulator is proposed. Describing function approach is taken to model the duty-cycle modulator, incorporating the effects of not only the modulating frequency fm, the switching frequency fs, and the two sideband frequencies fs-fm and fs+fm. This model is significantly more accurate than the conventional average model and the recently proposed two-frequency model for applications with high control bandwidth-to-switching frequency ratio and high input-to-output voltage step down ratio, such as the v-core voltage regulators. The model is verified by simulations and experiments.

This paper proposes a compensation strategy for parallel inverters to achieve weighting current distribution. In addition to the conventional current weighting distribution control (CWDC), the reference current of each inverter is fed back as a compensation signal to improve weighting current distribution. With the proposed compensation strategy, the output current of each inverter module can precisely track weighting current command. Experimental and simulated results from a three-inverter system with equal or different power ratings and with different kinds of loads have demonstrated the feasibility of the proposed strategy. I. IAS2005 954 0-7803-9208-6/05/$20.00 © 2005 IEEE IAS 2005 956 0-7803-9208-6/05/$20.00