| Summary: | 碩士 === 國立交通大學 === 電機與控制工程系所 === 93 === The objective of this thesis is to design a Class D audio amplifier based on Finite Receding Horizon Quadratic Optimal Control. Comparing to the traditional Class A or Class AB amplifiers, audio amplifiers based on Class D topology are more efficient in terms of energy conversion and have low cost. An important aspect of digital signal processing is the impact of quantization errors. In this thesis, we focus on the topic about quantization errors and define a cost function, which is utilized to minimize a measure of the quantization distortion by using finite receding horizon quadratic optimal control. We propose a Multi-Step Optimal Converter, which can be implemented as a feedback loop. It embeds Sigma-Delta Modulation in a more general setting and typically provides better performance. Class D amplifiers commonly rely on Pulse-Width Modulation to generate the output switching waveforms which gives rise to more serious problems in unwanted harmonics . On the other hand, using Multi-Step Optimal Converter, it is possible to design the loop filter so that the harmonic distortion is reduced. This thesis will analyze and implement a stable digital Multi-Step Optimal Converter, USB interfaces, and a switching power stage to complete a full digital audio amplifier.
|
|---|
