Power Electronics

Data Points

Library Promises More Accurate Power IC Models

EMA Design Automation, a full-service provider of electronic design automation (EDA) solutions, and AEi Systems, a company specializing in power electronics modeling and analysis, have released the Power IC Model Library. This PSpice library incorporates more than 150 time-domain simulation models for power electronic designs and gives designers capabilities previously unavailable for these popular parts — the ability to plug in a model, representative of the actual IC, and simulate the switching performance under actual operating conditions.

“Many EDA vendors only have access to information in the data sheets, which is not sufficient when modeling a controller or regulator,” says Charles Hymowitz, managing director of AEi Systems. “The data sheets simply do not have the level of detail required, and companies who rely solely on data sheet input produce substandard and inaccurate models.”

“AEi Systems has proprietary relationships with nearly all of the top analog IC manufacturers. Those relationships give AEi access to the part characteristics needed to produce models with the accuracy our customers expect,” says Manny Marcano, president of EMA Design Automation. “Because AEi Systems is the sole developer of many Power IC models, this library contains parts that are not available from any other EDA company. At $995 per user, the library is a tremendous value, since single models can cost from $2000 to $15,000 each to develop.”

Today's switched-mode power-supply designs require increases in power IC functionality, switching frequency and system interaction. According to the vendors, state space-based models simply do not reveal many important nonlinear factors that influence these performance characteristics. The models in this new model library enable designers to perform high-speed, cycle-by-cycle simulations to show true large-signal performance, simulate current-mode control using the latest accurate modeling techniques, run CCM and DCM converter simulations, generate line and load step responses, and measure power stage loss and stress analysis for all major components.

The models in the Power IC Model Library are compared and verified with bench data under startup, steady-state, line and load transient conditions. Nonlinear characteristics such as propagation delay, switching speed, drive capability, maximum duty cycle/current limits and startup phenomena are all accurately modeled. Designers can directly compare the performance of components from various vendors and analyze the effects of different implementations, such as peak-current mode control, hysteric current control, low voltage and low operating current, to name just a few.

More details are available at www.ema-eda.com/products/other/powericlib.aspx, including a list of the components and documentation detailing the models' accuracy and performance.

Slow Growth Forecast For Communications Power

According to a report recently released by the Darnell Group, the total worldwide dollar market for both wireline and wireless power systems is projected to be $4.29 billion in 2005, growing to $4.42 billion in 2010, a compound annual growth rate of just 0.6%. These and other findings appear in the 8th edition of Darnell's report “Global Communications Power: Market Forecasts, Business Trends and Competitive Analysis.”

According to this study, companies are seeking to expand the power system market and augment their revenue by offering engineering and installation services (E&I). Although these services have existed on a broader equipment-installation level, power-system makers are focusing their services specifically on power and achieving positive results. Darnell estimates that the worldwide E&I market for wireless/wireline power systems will grow 6.2% between 2005 and 2010, from $1.06 billion to $1.42 billion. Compared with the growth of the power-system market, the growth of the E&I market has proven more attractive to companies over the past few years.

Although the worldwide communications power-system market has experienced declines over the past few years, the report indicates there are signs that this market is starting to turn around. This improvement is likely to translate into flat sales as opposed to declining sales.

The report also finds that in certain markets, such as wireless, the actual number of base stations is expected to increase slightly, although price pressures will keep revenue flat. Meanwhile, broadband access is expected to be a key driver of equipment spending in the worldwide communications power market. The introduction of IP networks, along with the rollout of 3G and Wi-Fi services, also will boost equipment sales. For more information, see www.darnell.com.

Power Organizations Unite to Advance Power-Supply Development

The Power Sources Manufacturers Association (PSMA) and the Power Electronic Industry of Ireland (PEIG) announced that they have entered into a cross-membership agreement intended to foster collaboration and information exchange between the two organizations. The collaboration, as outlined in the mutual letters of invitation, provides each organization the opportunity to participate in the other's activities and committees. PEIG represents members throughout Ireland while PSMA brings the international perspective with members in the United States, Europe and Asia. As part of the alliance, reciprocal affiliate membership will be afforded to each organization.

“PSMA believes it is very important to work with other organizations such as PEIG to the benefit of our industry,” says Arnold Alderman, board chairperson for PSMA. “We hope this agreement will nurture a better understanding and a higher degree of cooperation between our members. All members of PEIG and PSMA are urged to participate fully in the opportunities afforded by this important cross-membership agreement.”

According to Gary Duffy, chairman for PEIG, “PEIG is pleased to be forming this alliance with PSMA. We already have many corporate members active in both organizations, and this alliance will encourage greater participation and cooperation as our industry strives to address the demands of the 21st century.”

PEIG was established in 2004 to represent the interests of enterprises involved in power electronics in Ireland. Among the objectives of PEIG are to promote the strategic development and international reputation for excellence of the power electronics industry in Ireland and to strengthen relationships between all stakeholders in the industry, including industrial members, universities and research institutes.

PSMA is an active organization consisting of power-supply manufacturers, users, power-component suppliers, academics and consultants interested in furthering the cause of the power-supply industry. Started in 1984, it is a nonprofit, democratic and participative organization whose main and common goal is to enhance the stature of the power-supply industry, and to provide education and information about this unique industry through published reports, educational seminars, technical workshops and conference exhibits.

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