Improved Accuracy for Online AC Inductor Loss Tool

Würth Elektronik has recently announced the addition of dc ripple bias modelling to its RedExpert on-line power analysis tool. This new feature aims to address a little understood phenomenon where ac core losses increase when the ac ripple is dc biased. While it may seem counterintuitive, this effect can lead to unexpected temperature rise if not properly accounted for.

One common scenario where this situation arises is in buck regulators. The company explains that the minor BH loop from the ac ripple follows along the general form of the major BH loop. The permeability and inductance are proportional to the slope of the curves. As the minor loop moves closer towards saturation, the slope decreases, resulting in increased ripple current. This decrease in slope elongates the BH loop, leading to more losses. Therefore, as dc bias is increased, the inductance will eventually start to decrease as it moves towards saturation, increasing both the ripple and the ac losses.

RedExpert, which is available in both on-line and downloadable versions, requires registration. It is also offered in six languages. The tool provides a comprehensive power analysis solution and can be a valuable resource for engineers working in the field. To learn more about RedExpert and its capabilities, you can watch the introductory video provided by Würth Elektronik.

By incorporating dc ripple bias modelling into RedExpert, Würth Elektronik aims to enhance the accuracy and reliability of power analysis. This new feature will enable engineers to better understand and account for the effects of dc bias on ac core losses. By doing so, they can prevent unexpected temperature rise and ensure the optimal performance of their power systems.

With the addition of this new capability, RedExpert continues to solidify its position as a leading power analysis tool in the industry. Engineers can now benefit from a more comprehensive and accurate analysis of their power systems, ultimately leading to improved design and performance.