Design of high fidelity pulse width modulation inverter

Pulse-width modulation (PWM) is well established in power electronics as a basis for inverters with sinusoidal output voltages. It provides two crucial advantages: high power delivery efficiency and easy digital-to-analog demodulation. Thus PWM can be applied in audio signal processing chain as a switching function for a bridge inverter, and a low-pass filter extracts the audio. Meanwhile, this process is nonlinear. So it has often been assumed that implementation of PWM in audio benefited us with its efficiency improvement at the price of distortion. This work explored how PWM can be applied to provide high fidelity audio signal processing with nonlinearity compensation. The distortion effects are analyzed in depth. Noise-shaping processes that reduce quantization errors in the process are described. An inverter is presented that processes information directly in digital form PWM sequence with accurate correction added in the front end noise shaping module. The signal processing chain from digital input to the inverter gate drives is entirely digital. Simulation results confirm that a PWM inverter with efficient nonlinearity compensation can achieve high fidelity in practice.

Name thesis:degree_name

Master of Science in Engineering.

Level thesis:degree_level

Masters

Discipline thesis:degree_discipline

Electrical and Computer Engineering

Grantor

University of Texas at Austin

Year dc:date.issued

2004

Author dc:creator

• Jiang, Gang

Advisor dc:contributor.advisor

• Davis, John H.

• Signal chain
• Pulse-width modulation
• Noise shaping

Statement dc:rights

• Copyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.

Language dc:language.iso

eng

Identifier URI

http://dx.doi.org/10.26153/tsw/5455

OAI identifier oai:identifier

oai:repositories.lib.utexas.edu:2152/78368