摘要
三相精密功率源在工频仪器仪表校验中得到广泛应用。本文对功率源采用线性功率放大器的功率损耗问题进行了分析，提出了采用脉宽调制式功率放大器的技术方案，并对该功率源的构成及工作原理进行了论述。测试结果表明，该功率源具有输出波形失真度小（≤０．８％）、输出电压（电流、功率）稳定度高（在１００秒内相对变化率≤０．０２％）、效率高、输出功率大和可靠性高等特点。
猅he threephase precise power source has been found with a widespread application in testing and calibrating the industrial frequency instrument and meter. The losses of linear power amplifier used in the power source is analysed in this paper. A power amplifier using the pulsewidth modulation scheme is given, and its construction and principle are described. The experiments and tests show that the power source under the proposed scheme offers a total harmonic distortion of 0.8% and relative variance ratio of 0.02% in 100 seconds of the output voltage(current) waveform and has high power efficiency, high power output and high reliability.
出处
《计量学报》
CSCD
北大核心
1998年第3期165-169,共5页
Acta Metrologica Sinica
关键词
功率源
功率放大器
脉宽调制
数字合成
Power source
Power amplifier
Digit synthesis
Pulsewidth modulation
