Analysis and compensation of dead-time effect considering parasitic capacitance and ripple current

Abstract

Dead-time produces distorted voltage and current, which degrades the performance of inverters. To compensate for the dead-time effect, its influence on converter voltage should be modeled precisely first. However, the state-of-the-art models of dead-time effect do not consider either the parasitic capacitance of power devices or the ripple current of inductors. These non-ideal factors prove to be of significant impact on voltage deviation. Taking into account the non-ideal factors, this paper establishes an accurate model on dead-time effect. An analytical expression is derived, which can be used for dead-time compensation control in real time. The proposed solution features simple implementation and improved compensation performances. The theoretical analysis is verified experimentally through a 2kW prototype.