The concern of the global demand for green power adapter is growing, but it also added a new variable for the design of the power supply and power adapter. Designers not only to consistently consider the design specifications required by the destination terminal device, now also must take into account evolving overlap energy efficiency standards.

These evolving standards bring a variety of variables.

First, the standards themselves are constantly changed and diversified. Both government standards, such as the China Standard Certification Center (CSC); industry objectives and operating examples, such as being developed by the Green Grid (The Green Grid) data center energy efficiency metrics; brand and awareness of energy saving projects such as the U.S. "energy Star" (ENERGY STAR); and incentive items, such as the 80 PLUS. Therefore, the existing regulatory requirements, and voluntary projects; both government organizations, trade associations, but also affect the green design of third parties.

Secondly, these standards may or may not involve the energy efficiency of all three areas: standby power consumption, energy efficiency and power factor. Standby power consumption to a minimum, almost all charging equipment and a substantial part of time, the power plug is plugged in, but the goal and very much the work of other products. High power consumption and a long time in a fully working status product, energy efficiency targets are common. Such as "Energy Star" first focus will be generally 65% can be efficient upgrade to 80% can be efficiency benchmark; now, 50W power adapter can effect up to 85% of electricity has application; while 90% of the energy efficiency of products also in development such as the 150W desktop adapter . Power consumption is greater than 75W power adapter products in the common minimum power factor ratio requirement. In the power supply power factor correction (PFC) may promote the designers to consider that they did not use different topology.

Third, the variable is the market demand. Some of the power supply and power adapter customers specified according to standard energy efficiency rating. It will also require to be extended to support lower than the rated level of AC voltage level, in order to maintain the performance of end products in the input under voltage. The development of power and the power adapter must balance regulatory requirements and market demand, and commercial trade-offs, balanced input the number of production design and the greater the advantages of mass production.