Switching-based topologies for high-efficiency audio amplifiers

被引：4
|
作者：
Saponara, S [1 ]
Terreni, P [1 ]
机构：
[1] Univ Pisa, Dept Informat Engn, Pisa, Italy
来源：
ISSCS 2005: INTERNATIONAL SYMPOSIUM ON SIGNALS, CIRCUITS AND SYSTEMS, VOLS 1 AND 2, PROCEEDINGS | 2005年
关键词：
D O I：
10.1109/ISSCS.2005.1509909
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The paper describes the PCB-realization of two high-efficiency amplifiers for consumer audio applications. A 35 Wrms output power delivered to an 8 11 speaker is referred as case study. The first architecture implements a switching amplifier with 3-state Pulse Width Modulation (PWM) while the second solution is an hybrid topology: a linear amplifier is assisted by a switching (buck) converter to increase efficiency for output power higher than 2 Wrms. Compared to conventional linear and class D amplifiers the proposed schemes allow for good performances in terms of harmonic distortion and power efficiency with different trade-offs: the hybrid topology achieves a 0.11 % distortion for a 77 % power efficiency while the 3-state PWM switching amplifier features a 91 % efficiency and a 0.23 % distortion.
引用
收藏
页码：283 / 286
页数：4
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