Careful Selection Of Power Supply Ic Face The Challenge Of Stringent Energy Conservation Laws

Over the past decade, as rising energy costs and the rapid growth of electricity demand

, governmental and industry organizations unveiled a new energy efficiency standards for electronic equipment. California Energy Commission (CEC), Energy Star, Federal Energy Management Programme (FEMP) and the European, Japanese and Chinese laws and regulations set by similar institutions, are directed against a large number of common consumer products with external power supply and set in the standby mode power to set the highest power level. While many of these standards are non-mandatory standards, but some of the standards, such as the CEC made mandatory or "Energy Star" initiative have now been widely accepted by all manufacturers.

These new standards are encouraging system designers to re-evaluate its power system, and their design be modified to comply with these improved power efficiency standards. Not long before, consumer electronics designers to design more efficient external power is not much power. Cost considerations are often the driving factor in power supply design, if the costs are still low, then, many designers still choose those inefficient linear transformer-based devices. However, when faced with such as CEC and other mandatory standards were introduced and the linear frequency transformer main raw materials - copper and iron - the prices are rising, the designers began to shift to significantly improve the efficiency of switching power supply.

So far, the majority of laws and regulations were introduced for the very well-defined vertical applications. For example, government agencies or industry organizations have mobile phones, DVD players and computer defines the corresponding power standards, but when designers develop new products integrating many functions or creating new types of products, they often feel the rules will apply no start.

Level standards forthcoming

This would not return. In the rapidly changing electronics industry, new technologies are constantly redefining the market and vertical market is in view of this understanding, the Government and industry organizations have begun to develop a broader type of product for the new power standard, rather than then narrow the application of the product for control. Relevant institutions in the European Union under the leadership of the new "horizontal" legislation is expected to cover the broader product category, making the rules more clear, while all the system designer in power efficiency and standby power consumption design and create a fair competitive environment.

As more details of such laws and regulations specific, product developers can take this opportunity to re-evaluate their power supply design. In the past few years, most of the design team are beginning to give up the external power supply based on linear transformer, switch-based switching mode external power supply to more efficient use of its advantages. However, other factors in the power supply also play a key role in performance. When the developer to meet the requirements of these new regulations to upgrade their systems, they also must be considered: each particular switch IC to provide much needed power to meet the system requirements to run the standby mode. For example, some IC with on / off control scheme, you can not set conditions, with lower switching losses, while others are using a dedicated IC PWM cycle frequency hopping mode or burst mode to achieve no-load and low load regulations.

In the case of input power must have a higher output power switch IC, product development can provide greater design flexibility. To the two switches IC example: under a low load with 70% conversion efficiency, the other has a 50% conversion efficiency. As the regulations will enter standby mode power limit to only 1W, so use the first IC designers with the use of the second IC's competitors, its power budget per cent more 200mW. If the power budget is relatively big, the product design team can add a clock in the design, use of larger embedded memory, or run more MPU power and improve software performance. Ultimately, these additional features can make the final product in its competing products stand out, and thus gain market share.

Conclusion

Product developers are ready to formulate the regulations adopted by the certification body corresponding rules, is constantly increasing public awareness to energy conservation efforts, and consumers of energy saving ideas have begun to slowly improve. Developers will find that eco-efficiency has increasingly become a distinguishing factor in the market can not be ignored. Through careful assessment of its power IC selection, designers can take the opportunity to increase their power budget to maximize product functionality and marketability.

by: vovo

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