ROTIMA AG - Magnetic Components

High-Frequency/SMPS Transformers

Rotima's high-frequency transformers transfer energy in switching power supplies and provide electrical isolation between circuits. We develop topology-specific solutions for flyback, forward, push-pull, and bridge circuits, tailored to power, frequency, voltages, isolation, losses, and installation space.

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Design suited to the converter topology

Galvanically Isolated Power Transmission

One or more output windings

Standard and Custom

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High-Frequency/SMPS Transformers from ROTIMA AG

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Custom Engineering

From the Circuit Design Concept to a Production-Ready Transformer

A robust magnetic design is developed based on the schematic diagram, operating data, and insulation requirements. Rotima provides support throughout the entire process—from core and material selection, winding design, mechanical design, and prototype production to electrical verification—all the way through to reproducible series production.

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Clarify topology, voltages, currents, frequency, and duty cycle

Design the core, gear ratio, windings, and insulation

Produce prototypes and verify electrical and thermal specifications

Transition to documented mass production

Applications

Magnetics for Isolated Power Supplies and Power Converters

High-frequency and SMPS transformers are used wherever electrical energy needs to be transmitted in a compact, efficient, and electrically isolated manner.

Flyback Converter

Power transmission and galvanic isolation in compact power supplies and auxiliary power supplies.

Isolated DC/DC Converters

Voltage regulation and isolation in industrial electronics, communications technology, and distributed power systems.

Gate Driver Power Supplies

Isolated auxiliary voltages for IGBT, MOSFET, and other power semiconductor drivers.

Half-bridge and full-bridge converters

Transformers for direct-transfer topologies with application-specific core and winding designs.

Half-bridge and full-bridge converters

High-frequency transformers for higher power ratings and symmetrically driven magnetic circuits.

Power and Industrial Electronics

Auxiliary power supplies for inverters, chargers, automation systems, measuring instruments, and telecommunications systems.

Reliable Specifications

Quality and Technical Verification

The magnetic and electrical design is verified based on defined test conditions. Depending on the model, magnetizing inductance, leakage inductance, winding resistances, turns ratio, and dielectric strength are tested. Refer to the respective data sheet for product-specific limit values and operating conditions.

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Inductance Measurement at a Defined Frequency and Measurement Voltage

Checking Stray Inductance and Winding Resistances

Testing the insulation between windings and the core

Mechanical drawing and clear winding and connection diagram

Please send us your requirements

A schematic diagram, topology, input and output data, switching frequency, duty cycle, insulation requirements, and available installation space are sufficient as a starting point. Our experts review the requirements and recommend a suitable design or develop a custom high-frequency transformer.

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Custom Inductors Directly from the Manufacturer

Products

We design and manufacture custom transformers, chokes, and coils, drawing on our many years of experience and precisely tailoring them to your requirements for performance, size, and electrical safety.

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Development and Manufacturing

We develop and manufacture custom inductors tailored to your requirements for performance, quality, and compliance with standards. We rely on state-of-the-art simulation technologies right from the design phase.

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Certifications & Standards

Our products are synonymous with high quality and proven safety. They meet strict European and international norms and standards, ensuring reliable performance in demanding applications.

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What can we do for you?

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Tobias Nuffer

Managing Director & Key Accounting DE

What can we do for you?

Contact our product experts

Roland Jungen

Managing Director & Key Accounting DE

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High-Frequency/SMPS Transformers

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What are the advantages of using DC voltage transformers compared to AC voltage transformers?

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More information about our high-frequency/SMPS transformers

What is an SMPS transformer?

An SMPS transformer is a high-frequency transformer used in switching power supplies and power electronic converters. It transfers energy between switched circuits, adjusts voltages, and provides galvanic isolation. Its design is directly dependent on the topology and switching frequency.

How is it different from a 50/60-Hz transformer?

SMPS transformers operate at significantly higher frequencies and can therefore be designed to be much more compact. However, they are more sensitive to winding geometry, core losses, switching edges, leakage inductance, and parasitic capacitance. A power line transformer cannot be used as a high-frequency transformer without being redesigned.

What is a flyback transformer?

A flyback transformer, also known as a switch-mode transformer or flyback converter, stores energy in the magnetic circuit during the turn-on phase and transfers it to the secondary side during the turn-off phase. The magnetic circuit often has a defined air gap for this purpose. Its design differs fundamentally from direct-transfer topologies.

Why is stray inductance important?

Leakage inductance describes the portion of the magnetic flux that does not pass through all coupled windings. It can affect voltage spikes, switching losses, and EMC performance. The winding configuration, insulation, and coupling must therefore be optimized together.

What role does parasitic inductance play?

Capacitive coupling between windings can transmit high-frequency common-mode currents and radiated emissions. However, reducing the capacitance can affect magnetic coupling and stray inductance. The correct balance depends on the circuit, isolation, and EMC objectives.

Are multiple output voltages possible?

Yes. A high-frequency transformer can contain multiple secondary and auxiliary windings. For each winding, the voltage, current, control reference, insulation, and phase angle must be clearly specified.

What information is needed for the design?

The following information is required: topology, input voltage range, output voltages and currents, power, switching frequency, duty cycle, control method, desired inductance, allowable losses, temperature range, insulation, installation space, and connection technology. A complete schematic makes it easier to ensure a safe design.

Can existing SMPS transformers be replaced or redesigned?

Yes. An existing data sheet, drawing, schematic, or prototype can serve as a starting point. The electrical function, insulation, thermal load, and mechanical integration are verified and translated into a documented, production-ready design.

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