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Standby power consumption reduction scheme for power adapter

发表于2017-04-14

  1. From charging a tablet or smartphone cell to powering a laptop or home router, the power adapter has long been a necessary component of everyday life. For consumer electronics products to the power adapter and the collocation with original equipment manufacturer (OEM), need for two key driving factors, which ensure high efficiency levels and meet safety standards, but also need to provide a compact form factor. In recent years, due to the combination of government regulations and the United States "Energy Star", the European Union ecological design directive and the China Institute of Standardization (CNIS) and other energy efficiency projectsThe industry places great emphasis on reducing the overall energy level of the adapter by reducing the power used in the standby mode. This article will look at emerging technology trends that drive the latest requirements, including the need to reduce the number of external components used, and to make design more stylish and lightweight. Standby energy, sometimes referred to as "vampire energy consumption" or "virtual load", refers to the electrical energy consumed by an electronic device and an appliance when the power is switched off but still plugged into the power socket. For example, the standby energy consumption accounts for the average American household total energy consumption of about 10%. which is equivalent to a staggering 129 TWH (i.e. 129 billion KWH) of energy, or is the 36 400 megawatt power plant output power, resulting in annual emissions of 75 million tons of carbon dioxide.

     In the United States, July 1, 2008 entry into force of the current federal standard power of less than 250 W power supply no-load power consumption is less than 500 mW. recently, the U.S. Department of energy (DOE) put forward more and more strict battery charger and electronic products supply efficiency standards, and will take effect on July 1, 2013.According to the new standard, between the nameplate output power from 49 to 250 W (typical notebook video power in this range) of the AC - DC (AC-DC) maximum no-load power consumption of the external power supply must be less than 0.210 W.. However, these national standards generally lags behind other standards and market demands. In 1975 the United States energy policy and Energy Conservation Act (EPCA) provides that: the development of any new energy efficiency standards must be designed to provide maximum efficiency, not only technically feasible, but also have economic rationality. Therefore, these national standards usually do not represent "first-class" performance. Many power suppliers require that no-load energy consumption be limited to as low as possible, thus distinguishing their products from competing products.