中国电机工程学报2017，Vol.37Issue(6)：1808-1818,11.DOI:10.13334/j.0258-8013.pcsee.160256
基于有源钳位的高效单级开关功率放大器
High Efficiency Single Stage Switching Audio Amplifier Based on Active Clamp
钟曙 1许建平 1陈学健 2周翔1
作者信息
- 1. 磁浮技术与磁浮列车教育部重点实验室(西南交通大学电气工程学院),四川省成都市610031
- 2. 广东锐顸电力技术有限公司,广东省东莞市523808
- 折叠
摘要
Abstract
A single-stage switching amplifier (SSA) based on bipolar phase shift modulation (BPSM) is proposed in this paper.Freewheeling diodes,clamping capacitor and active clamping bridge (ACB) are inserted to the traditional half bridge high frequency link inverter as auxiliary commutating circuits,the proposed circuit is called as BPSM ACB-SSA.Flow path for the filter inductor current is provided by the freewheeling diodes during the commutation dead time of cycloconverter and the energy of filter inductor is absorbed by clamping capacitor.The energy stored in clamping capacitor is returned to the power supply through ACB circuit and the clamping capacitor voltage is balanced automatically.Zero voltage switching (ZVS) condition of cycloconverter switches are created by auxiliary commutating circuits and the secondary voltages of the transformer are clamped.By optimizing the parameters design,ZVS of the primary switches and ACB switches can be realized.BPSM ACB-SSA has much higher efficiency and smaller size compared with two stage class-D amplifier.The detail operation principle and commutation characteristics of BPSM ACB-SSA are analyzed and the soft switching condition of power switches is given in this paper.Finally,experimental results from a 120W prototype are presented to verify the analysis of the proposed circuit.关键词
高频链/单级逆变器/有源钳位/周波变换/开关功放/D类功放Key words
high frequency link/single stage inverter/active clamp/cycloconverter/switching amplifier/class-D amplifier分类
信息技术与安全科学引用本文复制引用
钟曙,许建平,陈学健,周翔..基于有源钳位的高效单级开关功率放大器[J].中国电机工程学报,2017,37(6):1808-1818,11.
