一体式计算机电源参考设计-onsemiconductor.pdf

一体式计算机电源参考设计 All-in-One PC Power Supply Reference Design 议程Agenda • EPA能效要求EPA efficiency requirements • 参考设计目标Reference design goals • 拓扑结构选择Topology selection • PFC段设计PFC stage design • LLC段设计LLC stage design • 同步整流(SR)设计SR design • 待机管理及协调Standby management and handshaking • 参考设计性能Reference design performance • 后续工作Future work • 总结Summary 2 规范机构的能效目标Energy Efficiency: Regulatory Agencies Targets • 降低待机(空载)能耗Standby (no load) Power Reduction • 通过电源的总电能中约有25%是在待机模式下消耗的~25% of total energy passing through power supplies is in standby mode[13] • 世界各地的规范机构纷纷瞄准降低待机能耗Concerted effort by worldwide regulatory agencies • 提升工作能效Active Mode Efficiency Improvement • 通过电源的总电能中约有75%是在工作模式下消耗的~75% of total energy passing through power supplies is in active mode[13] • 功率因数校正(PFC)(或谐波减少) Power Factor Correction (or Harmonic Reduction) • 遵从IEC61000-3-2规范(欧盟、日本) Applicable with IEC61000-3-2[11] (Europe, Japan) • 某些能效规范也要求功率因数(PF)0.9 Some efficiency specifications also require 0.9 PF. 例如：“能源之星”4.0版计算机规范example: computers (ENERGY STAR® rev. 4[12]) Korea e-Standby program[8] China CSC[6] Japan Top Runner[9] Japan Eco Mark[10] Australia AGO[7] California CEC[5] Europe ENERGY (ex-CECP), program program COC[4] STAR®[3] 3 高能效规范必威体育精装版进展-计算机 Update on Energy Efficiency Regulations - Computing 计算机Computing •台式机Desktops: •“能源之星”5.0版规范，2009年7月1 日生效 ENERGY STAR® 5.0 effective