應用於音訊放大器之可適應性補償機制單電感雙極性輸出直流-直流電源轉換器

Abstract

多媒體產品在現今的社會被廣泛應用於各種電子產品之中。由於環境保護的意識抬頭，省電、小尺寸且兼具優良音質的電子產品成為發展趨勢。因此，透過音源放大器與單電感雙極性輸出直流-直流電源轉換器的結合，能產製高效率且體積小的整合型音源晶片模組。將音源放大器與電源管理模組結合，足以提供最佳化的供應電壓給音源放大器使用，確保其輸出訊號有足夠的振幅與線性度。此外，藉由能量分配路徑之優先順序以及改變驅動主功率開關之閘極電位，能減少開關切換損失與提升整體系統的轉換效率。為了確保系統能在768kHz、1.536MHz、1.6MHz和3.072MHz等開關頻率的多變化範圍內達到穩定且不受次斜波震盪影響的情況下提供正確的輸出電壓，進而實現了自適應系統補償和斜率補償機制。最後，本論文所提出的方法將運用於電流模式直流-直流雙極性電壓轉換器上，並透過聯華電子點一五三微米製程，最終的模擬結果請參見於第4.7.1章節。

Nowadays, multimedia, including audio and visual products has become increasingly popular. Due to the increase of environmental awareness and protection, design a better electronics with power-saving, smaller size and good audio quality for consumer is a potential trend these years. Thus, in order to achieve a high-efficient and compact integrated audio module through the combination of single-inductor bipolar-output switching DC-DC converter and audio amplifier circuit, the combination of audio amplifier and power management unit can provide audio amplifier with optimal supply voltage and ensure its output voltage swing and linearity. Moreover, the purpose of using the priority of the energy distribution path is to reduce the switch switching loss while making the gate driving voltages of the power switches change is to enhance the power conversion efficiency in power management module. In order to make sure that the system is stable in wide variation of switching frequency, such as 768kHz, 1.536MHz, 1.6MHz and 3.072MHz, and avoid the sub-harmonic oscillation from happening. Hence, it is implemented an adaptive system compensation and slope compensation mechanism. Finally, this SIBO DC-DC converter is implemented by U153 with 10V-LDMOS process and the simulation results is shown in section 4.7.1.