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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。
Three-phase precision power supply in the power frequency instrument calibration has been widely used. In this paper, the problem of power loss of linear power amplifier using power source is analyzed. The technical scheme of using pulse-width modulated power amplifier is proposed, and the structure and working principle of the power source are discussed. The test results show that the power source has the advantages of small output waveform distortion (≤0.8%), high stability of output voltage (current and power) (relative change rate ≤0.02% in 100 seconds), high efficiency, High power and high reliability.