New Ac-Dc power converters with power factor correction

主要由于信息时代的需求，公用电网供电的电气设备的使用量正在急剧上升，并将继续这样做。必须采取行动满足随之而来的能源需求，以避免可怕的经济后果，但人们不愿建设昂贵的水力发电项目或污染严重的燃煤电厂，因为它们会导致全球变暖，在风能等“绿色”能源普及之前，还需要进行更多的研究。安大略的“熄灯”活动和“地球一小时”等全球性活动都强调了节约能源和更有效地利用能源的必要性。

The use of electrical equipment powered from the utility grid is rising dramatically and will continue to do so, mainly due to the demands of an information age. Action must be taken to meet the accompanying demand for energy to avoid dire economic consequences, but there is little desire to build expensive hydro-electric projects or polluting coal plants that contribute to global warning, and more research is needed before "green" sources like wind become common. Campaigns such as "FLICK-OFF" in Ontario and global events such as Earth Hour have stressed the need to conserve energy and to process it more efficiently.