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EMC filters defend against noise in culinary systems


By Holger Urban, Product Marketing Manager, Schaffner Group

Modern cooking appliance manufacturers continue to design more powerful, efficient and innovative products, especially in response to consumers demanding more healthy, high-quality food yet at faster cooking times.

In the modern kitchen, there is a multitude of different appliances used side by side, with little regard for electromagnetic compatibility (EMC). To avoid unintended disturbances and malfunctions, each appliance must completely comply with the mandated EMC value limits – and this is where EMC filters come into the equation.

EMC filter functions

EMC is the ability of electrical equipment and systems to function acceptably in their electromagnetic environment. Several electronic devices running simultaneously may cause unwanted electromagnetic interference and even influence their functionality – particularly true in products with microprocessors. To counteract such effects, protection requirements regulated by law must be satisfied, and using EMC filters defends the electronic environment against such dysfunctionalities.

Scrægg simplifies cooking

Schaffner’s EMC filters are routinely used in many different domestic appliances, be it a coffee machine, food processor or a new appliance for cooking scrambled eggs, as recently developed by the innovative start-up Scrægg from Wiesloch and Heidelberg in southwestern Germany. With its unusual and very fast method of preparing a scrambled egg, just one year after development, Scrægg’s device has sold very well, leading to a strong growth for the company, who proceeded to expand its production capacity and team. The idea behind the flagship product is as simple as it is ingenious: a steam nozzle prepares a delicious scrambled egg in just 15 seconds, without any fat.

Efficient and functional

In its system, Scrægg has installed Power Entry Module (PEM) filters of the Schaffner FN9280/90 series. Even just during the product development phase, the deployment of Schaffner’s IEC inlet filters greatly reduced both design time and effort. With measurements made with the Schaffner PEM filter, fitted, fast and functional solutions could be worked out directly to any noise problem.

The very space-saving design of the installed PEM combines a 2-pole isolating rocker switch and dual fuse holder in one unit, and, with a height of only 46mm, it is ideal for the innovative Scrægg system. Additionally, the PEM filters provide maximal flexibility with various mounting options.

Covering all EMC needs

When considering the power requirements of cooking and larger domestic or commercial appliances, a 10A maximum filter solution might not be able to cover the system’s needs. Due to limitations of the IEC 60320 standards, the maximum current for IEC C14 inlets in Europe is limited to 10A. If the nominal current of the customer’s system exceeds this 10A, other approaches must be considered, e.g. C20 inlet filter that can be used up to 16A (20A for the US), or with a chassis-mount version.

In order not to limit customer applications to a specific fuse holder or switch, the C20 versions of Schaffner inlet filters are reduced to the essential components, and do not feature a fuse holder or integrated switch. Chassis-mount filters with different types of connecting terminals, and in current ranges beyond 16A, are available to cover any needs in terms of ampacity and EMI/EMC performance.

One of the main benefits in using a combination of standard parts is the pre-existing safety certification that allows any designer to easily integrate standard filters in a system without certifying them again. Products are certified to EMI filter standards – IEC 60939-3, UL 60939, CQC and CSA, typically the basis for any other local/application-specific standard.

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