1·An analog signal is composed of four basic components: DC and AC magnitudes, frequency, and phase.
模拟信号由直流和交流分量、频率和相位四部分组成。
2·The control scheme and operating principle of a double closed-loop AC/DC power converter system are discussed by using physics.
从物理角度讨论了双闭环交/直流功率变换器系统的控制方案和工作原理。
3·The company manufactures power inverters necessary to convert the DC power generated by solar panels into the ac power required for most USES.
公司生产电力逆变器，把太阳能生成的直流电源转换为使用最多最需要的交流电源。
4·Some cutting-edge photovoltaic cells offer an even higher initial efficiency but fall behind when the DC power they produce is converted to grid-ready alternating current.
一些先进的光伏电池甚至可以提供更高的效率，但是由于要把直流电源转化为交流电，转换效率有所降低。
5·It would be far more efficient to power servers directly from a central DC supply.
而中央直流电源直接为服务器供能将大幅提高效率。