Power adapter market trend analysis

Issue Time:2006-09-21
An important trend in the power adapter market is that customers need adapters with higher output power and smaller size, which involves the use of new topologies. The power adapter mainly reflects some important trends. First, energy efficiency and standby (no-load) energy requirements are higher.

For example, the US Environmental Protection Agency (EPA) ENERGY STAR project released version 2.0 of the specification for external power supplies in April 2008. The EPA version 2.0 specification for external power supplies will take effect on November 1, 2008.

Power adapters mainly include two categories:
One type is an internal AC/DC power converter that is built into the electronics and may have multiple output voltages, such as internal power supplies for desktop computers.

The other is an external single-output AC/DC or AC/AC power adapter with a single output voltage, often referred to simply as an external power supply (EPS), for printers, notebooks, LCD monitors and game consoles. And other applications.

For example, the EPA 4.0 specification for computer power supplies for notebooks and tablets using external power supplies is primarily reflected in standby power consumption (≤1.0 W) and sleep energy consumption (≤1.7 W); in comparison, Dell The requirements for this type of power supply are mainly reflected in the energy efficiency under different specific load conditions, namely 0.7 W (input power Pin < 1 W), 1.5 W (Pin < 2 W), 10.7 W (Pin < 12.6 W) and 17 W. Under the load condition of Pin < 20 W, the energy efficiency is higher than 70%, 75%, 85% and 85% respectively. It is worth mentioning that the relevant energy efficiency standards will continue to increase requirements and evolution in the future.

Taking the laptop AC-DC power adapter as an example, the current high level of energy consumption in the no-load mode is about 300 mW, and the energy consumption of 150 mW in the no-load mode may become a target. Moreover, the requirements for multi-output adapters may also be included in the standard. Using ON Semiconductor's NCP1605 Power Factor Correction (PFC) controller and NCP1396 resonant mode controller can be used to design a 200 W benchtop adapter or a 300 W adapter. From a notebook adapter, its power requirements have risen from 50 W to 70 W to over 100 W. In addition, power adapters for new ultra-portable notebooks such as the Apple MacBook Air and the Lenovo ThinkPad X300 are smaller and lighter.

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