The product of the effective values of the voltage and current with the cosine of the phase Angle between current and voltage in an alternating-current circuit.

伏特量交流电路中电压与电流的有效值以及电流与电压之间相位角的余弦之乘积。

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This paper introduces a kind of electric circuit which mainly consists of a peak detector and a pulse-width discriminator for protecting the three-phase alternating-current supply with loses a phase.

介绍了一个主要由峰值检波器和脉冲宽度鉴别器构成的三相交流电源缺相保护电路。

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A power converter circuit (3) drives a switching device by the pulse-width modulated wave for converting a direct current into the three phase alternating current.

电力变换器主电路部（3），其根据该脉冲宽度调制波对 开关元件进行驱动，将直流电压转换为三相交流电压；

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