Performance of a diode-clamped linear amplifier

被引：36
作者：
Fujita, Hideaki [1 ]
Yamashita, Naoya [1 ]
机构：
[1] Tokyo Inst Technol, Tokyo 1528552, Japan
来源：
IEEE TRANSACTIONS ON POWER ELECTRONICS | 2008年 / 23卷 / 02期
关键词：
class-B amplifier; class-D amplifier; diode-clamping circuit; EMI; linear amplifier; PWM inverter;
D O I：
10.1109/TPEL.2007.915042
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：
This paper proposes a new high-efficiency diode-clamped linear amplifier, and presents its theoretical and experimental performance. The main circuit of the proposed amplifier consists of series-connected MOSFETs, series-connected dc power supplies and clamping diodes. The circuit configuration is similar to a diode-clamped multi-level inverter, except for using complementary power semiconductor devices, n-channel and p-channel MOSFETs. A pair of complementary MOSFETs in each leg is operated in an active state, just like a conventional linear amplifier, whereas the other MOSFETs are operated in either on- or off-state like a diode-clamped multilevel inverter. As a results, a prototype 12-series diode-clamped amplifier shows an experimental efficiency as high as 90%, while a conventional linear amplifier has a theoretical efficiency of 78.5%. Experimental results demonstrate that the proposed amplifier has the capability of driving a three-phase induction motor rated at 2.2 kW.
引用
收藏
页码：824 / 831
页数：8
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