Analytical Modeling of the Effect of Nonlinear Switching Transition Curves on Harmonic Distortion in Class D Audio Amplifiers

作者：Koeslag Francois^*; Mouton Hendrik D; Beukes Johan

来源：IEEE Transactions on Power Electronics, 2013, 28(1): 380-389.

DOI：10.1109/TPEL.2012.2200264

• Class D audio amplifier
• double fourier series
• nonlinear switching transition curves
• pulse timing errors
• total harmonic distortion

Practical switching transition times typically occupy less than one percent of the switching period in class D audio amplifiers. These transitions, however, are a very nonlinear function of current, which give rise to significant levels of distortion. This paper presents a method for determining the effect of nonlinear switching transition curves on harmonic distortion with in half-bridge and full-bridge topologies, taking into account the interaction between the various dominant pulse-timing errors. An accurate analytical model, based on the well-established double Fourier series method of analysis, for determining the effect on harmonic distortion is introduced. The analytical model is accompanied by an equivalent simulation model using an existing strategy, and the results are verified experimentally.

• 出版日期2013-1