PAPER SESSION 4: ERRORS AND DISTORTION
4-2 Harmonic Distortion Reduction with Output
Capacitance in PWM Inverters
Nacer Abouchi(1), Philippe Marguery(2).
(1) CPE Lyon, Lyon, France
(2) ST Microelectronics, Grenoble, France
An audio class D converter has nonlinear distortion provided
by power stage. In fact, the PWM inverter is influenced by the switching dead time introduced by the
power output control system. If output capacitance is
added, the audio quality is improved. In this paper the
interaction between the dead time effect and the output
stage capacitance is investigated. At first, each effect is
investigated separately. Then, the sum of the effects is
analyzed to predict the improvement of audio quality.
Finally, the calculated results are compared with low level
simulation in order to confirm the validity of the analysis.