说明：  电源功率因数校正(PFC).PDF 电源设计一直是一个极富挑战性的工作。随着许多传统的难题得以解决，一些有关电源 效率的规范和要求的标准将再次展现新的挑战。 规范标准的第一个阶段其实已经开始，针对降低待机能耗（低负载状态）方面。下一个 阶段的任务将更艰巨，就是提高工作状态下电源的效率。在美国国家环保局“能源之星” (Energy Star) 计划以及中国中标认证中心 (CECP) 的推动下，世界各地正在公布有关电源 工作效率的新能效标准。
(Power Supply Power Factor Correction (PFC). PDF power supply design has always been a challenging task. With many of the traditional problem can be solved, some of the power efficiency of the specifications and requirements of the standard will display the new challenges. Standards in the first phase has already begun, for reducing standby power consumption (low load state) area. The next stage will be more difficult the task is to improve the efficiency of state power. In the United States Environmental Protection Agency " Energy Star" (Energy Star) plans, and China Standard Certification Center (CECP), driven all over the world to announce the power efficiency is the new energy efficiency standards.)