Linear power supply sector targeting full Energy Star compliance

Since the US and the EU adopted the Energy Star standard, China manufacturers of linear power supplies have been stepping up R&D for compliance. The guideline, which aims to reduce energy consumption and greenhouse gas emissions, requires both switching and linear types to have a standby power of not more than 0.5W.

Makers of the former, including major companies On Semi, Power Integration and Kuantech, have launched units conforming to the regulation.

It is more challenging, however, for makers of linear power supplies. Such products typically consist of a traditional transformer with a silicon steel sheet and copper wires. Maintaining a standby power of 0.3W entails more than just technology innovation and adoption of new materials.

Nevertheless, enterprises such as Shenzhen Wonengda Technology Co. Ltd are able to turn out compliant units. The manufacturer has developed the model MEC thick-film IC, which installs into a linear power supply and provides a standby consumption of 0.09W, lower than the Energy Star requirement.

The company adopted a special technology process for producing the chip, which then slashes the 3 to 250W typical input power range of linear variants. The component has passed relevant testing, including UL and China Ceprei Laboratory requirements.

Shenzhen Wonengda has started mass manufacture of the IC. Being the first in the world, the maker owns all propriety rights for it, according to chief engineer He Shuguang. Aside from power supplies, plans are under way to develop a series for air conditioners, A/V equipment, refrigerators and TVs.

Linear types make up 35 percent of the global power supply industry dominated by switching kinds. The former is adopted in high-end medical and A/V equipment, and some military and telecom products. The mainstream applications are home appliances, toys and security devices.