A Numerical Method for Calculating the Output Spectrum of an H-Bridge Inverter with Dead-time Based on Switching Mode Analysis

Abstract

published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User

Exploring the Boundaries and Effects of the Discontinuous Conduction Mode in H-Bridge Inverter with Dead-time

“…3, the switching cycle can be divided into three modes depending on the inductor current waveform: soft-switching continuous conduction mode (SSCCM), discontinuous conduction mode (DCM) and hard-switching continuous conduction mode (HSCCM). SSCCM and HSCCM have been investigated into in [14] and they are not the focus in this paper. While for DCM, it can be further classified into four different switching modes, as shown in Fig.…”

“…where t c (n) is the clamping time during which the inductor current is clamped to zero. In previous research [14], i L (n) is assumed to be i L (n) * . However, a current error introduced by the voltage error during the dead-time is introduced.…”

“…7 and a zoom-in of the waveforms in DCM is shown in Fig. 8, where u e , u e , u e,1 and u e,2 are the simulated voltage error, the moving average value of the simulated voltage error, calculated moving average value of voltage error based on the method in [14] and in this paper respectively. As can be seen, both the voltage error magnitude and the boundaries of DCM estimated by this paper shows an improved accuracy compared to the previous one.…”

“…Furthermore, discontinuous conduction mode (DCM) of the inductor current might be present in some switching cycles, which causes a variable voltage error to the switch-node voltage [13]. In [14], a mathematical expression was given to describe the values of the switch-node voltage under different conditions of the inductor current in a fundamental period. The expression was derived based on the assumption that the moving average value of the inductor current is equal to the reference output current.…”

“…The clamping time during which inductor current is clamped to zero during the time is calculated. Moreover, an accuracy-improved model of the voltage error in DCM compared to [14] is proposed by taking the deviation of inductor current from the ideal current into consideration. The boundaries of the DCM are determined with a numerical method.…”