A Describing Function for Resonantly Commutated H-Bridge Inverters

Abstract

Abstract-The paper presents the derivation of a describingfunction to model the dynamic behavior of a metal oxide semiconductor field effect transistor-based, capacitively commutated H-bridge, including a comprehensive explanation of the various stages in the switching cycle. Expressions to model the resulting input current, are also given. The derived model allows the inverter to be accurately modeled within a control system simulation over a number of utility input voltage cycles, without resorting to computationally intensive switching-cycle level, time-domain SPICE simulations. Experimental measurements from a prototype H-bridge inverter employed in an induction heating application, are used to demonstrate a high degree of prediction accuracy over a large variation of load conditions is possible using the simplified model. Index Terms-Metal oxide semiconductor field effect transistor (MOSFET)-based capacitively commutated H-bridge, switching cycle.

Modeling and Analysis of Induction Heating Converters

“…This is the reason why most of the electrical quantities from the load can be considered sinusoidal. That's why the describing function method can be introduced in a natural way for the analysis of the resonant converters (Sewell et al, 2004), (Kelemen & Kutasi, 2007b). Let us consider the inverter circuit from Fig.…”

Soft Switching Voltage Regulation for Inductorless Piezoelectric Transformers: A Cyclic-Mode Analysis

“…From ( 19) and (20), a new matrix K can be introduced to reset the existing 𝑣𝑣 𝐶𝐶in to 0 at each switching instant. Where 𝑣𝑣 𝐶𝐶in takes a new value, an additional vector xi, representing the discontinuity in vCin due to MOSFETs switching, sets the new value of 𝑣𝑣 𝐶𝐶in .…”

A Novel Three Phase Cascaded Multilevel Inverter

“…Traditional cascaded multilevel inverters called cascaded multilevel H-bridge, shown in Fig. 2, drawn much attention recently [2][3][4][5][6][7][8], can achieve high-quality output waveform with simple topological structure. It needn't any output transformers or dynamic equalizing circuits, has low switching frequency and small switching stress.…”