SMP releases EMC filters with high frequency stability

October 19, 2018

SMP releases EMC filters with high frequency stability

Two EMC filters and a three-phase choke module from SMP (Courtesy SMP Sintermetalle Prometheus GmbH & Co KG)


SMP Sintermetalle Prometheus GmbH & Co KG (SMP), Graben-Neudorf, Germany, a developer and manufacturer of inductive components, filter systems, magnetically soft materials, cores and mouldings, has released a new range of EMC filters with high frequency stability. These specifically developed materials are said to be effective for frequencies up to the gigaHertz range.

EMC filters reduce interference currents generated by parasitic effects and cyclic elements in power converter systems. The material plays an important part in achieving stable inductance over the entire frequency spectrum in order to maximise interference suppression. Compared with standard technologies, which use materials such as ferrite, electrical steel sheets and nanocrystalline metal sheets, interference levels with the new EMC filters from SMP can be as much as 40 dB[µV] (decibel microvolt) lower.

SMP’s new EMC filters are reported to be compact, up to 30% lighter, and noiseless, being made from magnetostriction-free materials. The overall efficiency of the system is improved due to very low losses through the materials, and moreover, fewer filter components are needed, so volume is reduced and the cost-effectiveness of the power electronic system as a whole is significantly increased. The filters can be manufactured with single or magnetically coupled chokes, and so offer a choice for reducing common mode and differential mode interference.

SMP specialises in the development and manufacture of customer-specific filter systems and inductive components. The company’s component portfolio is designed for currents of up to 2000 A, up to 3000 A for special applications, and for frequencies up to the gigaHertz range. The materials used in the new EMCs have been developed and manufactured by SMP specifically for this purpose, and have high saturation induction of up to 2 Tesla.

Individual EMC components can be produced with dimensions from 19–300 mm and weights of 0.05–130 kg, and the temperature class H (up to 180 °C) insulation system is UL certified. Depending on the application, protection ratings up to IP66 are available, and HL classes according to EN 45545 can be specified depending on the requirements.

SMP’s filter systems and inductive components are used in industrial applications in the power electronics, automation and signal processing sectors, in drive applications for railway engineering, electromobility and marine engineering, and in medical technology, renewable energies and power supply, and the aerospace industry.

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