Title :
A hybrid voltage amplifier for power calibrator with harmonics analysis capability
Author :
Lavric, Henrik ; Nastran, Janez
Author_Institution :
Fac. of Electr. Eng., Ljubljana Univ., Slovenia
Abstract :
The paper describes a voltage amplifier that is capable of accurate amplifying voltages up to 300 V rms within the frequency range from 40 Hz to 70 Hz with or without the presence of higher harmonics. Its sophisticated topology consists of a supreme linear amplifier 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 amplifier and an inverter. The later 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 exceeds 90%.
Keywords :
calibration; feedback; feedforward; harmonic analysis; invertors; power amplifiers; transformers; 300 V; 40 to 70 Hz; class AB amplifier; feedforward-feedback; filter; harmonics analysis; high efficiency; hybrid power amplifier; inverter; linear amplifier; load current; output transformer; power calibrator; power efficient system; self-oscillating system; voltage amplifier; waveform ripple; Frequency; Harmonic analysis; Inverters; Power amplifiers; Power harmonic filters; Power system harmonics; Testing; Topology; Voltage control; Watthour meters;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2003. APEC '03. Eighteenth Annual IEEE
Conference_Location :
Miami Beach, FL, USA
Print_ISBN :
0-7803-7768-0
DOI :
10.1109/APEC.2003.1179327
