A power-efficient transconductance amplifier for wide-band high current calibrations

被引：0
|
作者：
Lavric, H [1 ]
Voncina, D [1 ]
Zajec, P [1 ]
Nastran, J [1 ]
机构：
[1] Univ Ljubljana, Fac Elect Engn, SI-1000 Ljubljana, Slovenia
来源：
2003 IEEE INTERNATIONAL CONFERENCE ON INDUSTRIAL TECHNOLOGY, VOLS 1 AND 2, PROCEEDINGS | 2003年
关键词：
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In the paper a transconductance amplifier capable of accurate amplifying currents from 1 mA up to 60 A rms within the frequency range from 40 Hz to 70 Hz with or without the presence of higher harmonics components is presented. Its sophisticated topology consists of a supreme control loop and an inner hybrid power amplifier with an output transformer. The hybrid power amplifier, which acts as a self-oscillating system, is composed of a superior three-stage class AB linear power amplifier and an inverter. The latter provides a full load current while the former filters the waveform ripple. In this way a power efficient system is obtained whose efficiency at a full output power is some 90%.
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页码：631 / 635
页数：5
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