《开关电源能效测试方法EPSupplyEffic_TestMethod_0804》.pdfVIP

Test Method for Calculating the Energy Efficiency of Single-Voltage External Ac-Dc and Ac-Ac Power Supplies Chris Calwell, Suzanne Foster, and Travis Reeder, Ecos Consulting Arshad Mansoor, Power Electronics Application Center (EPRI-PEAC) August 11, 2004 Funded by the Public Interest Energy Research (PIER) program California Energy Commission 1 1. Scope This document specifies a test method for calculating the energy efficiency of single- voltage external ac-dc and ac-ac power supplies, herein referred to collectively as “power supplies.” Power supplies are designed to convert line voltage ac into the low voltage output (either ac or dc) typically required by laptop computers, cordless and cellular phones, portable stereos, etc. External power supplies are contained in a separate housing from the product they are powering. These external power supplies are often referred to as “ac adapters.” A single voltage power supply provides one dc or ac output that is either at a fixed voltage or user selectable through a selector switch. Power supplies with multiple, simultaneous output voltages, whether internal or external, are beyond the scope of this document. Dc-dc voltage conversion equipment such as dc-dc converters are not included in the scope of this document, except to the extent that such circuitry may be found within a power supply. The purpose of this test procedure is to establish a standardized method that can be used worldwide to measure the efficiency of single voltage external ac-dc and ac-ac power supplies across a full range of load conditions. Its intent is not to replace IEC 62301, which focuses closely on the measurement of standby power, but to augment and extend it downward to the measurement of no load conditions and upward to the measurement of