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Power Magnetics
Power magnetics are used throughout modern power conversion, from isolated DC/DC and offline AC/DC supplies to gate drive, current sensing, and power factor correction. Although the applications vary, selecting the right magnetic component usually comes down to balancing electrical and mechanical requirements such as insulation, leakage inductance, thermal performance, EMI behavior, package size, and cost. Würth Elektronik offers transformer and choke families for these applications, giving designers a range of options to match the requirements of their design.
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Transformers for
DC/DC Converters -
Transformers for
Push Pull Converters -
Transformers for
AC/DC Converters -
Gate Drive
Transformers -
Current Sense
Transformers -
Power Factor
Correction Chokes
Transformers for DC/DC Converters
DC/DC transformers provide galvanic isolation while transferring power across an isolation barrier. They are widely used in applications ranging from PoE-powered equipment and isolated interface supplies to industrial auxiliary rails and controller-specific converter designs.
Typical applications include:
- PoE and PoE+ powered devices
- Telecom, industrial, and medical power supplies
- Housekeeping and auxiliary rails
- Isolated communication and interface power
- Motor control, automation, PLC, metering, and protection systems
Depending on the product family, designers can select features such as:
- Small SMT footprints and low-profile construction
- Low leakage inductance
- Multiple outputs and output voltage options
- Functional or reinforced insulation
- Controller-specific compatibility
- Simplified implementations with fewer external components
These transformer families give designers flexibility to match the magnetic component to the converter topology, insulation requirements, available board space, and overall system objectives.
Transformers for Push-Pull Converters
Push-pull converters are commonly used to generate compact isolated power for interface, control, and driver circuits. Würth Elektronik push-pull transformers support these applications with product families optimized for different insulation requirements, package sizes, and operating conditions. Würth Elektronik has worked closely with IC manufacturers to develop transformers for many reference designs, including Texas Instruments SN6501 and SN6505, Analog Devices MAX25xx, Nexperia NXF65xx, and more.
Typical applications include:
- Isolated interface power for CAN, RS-485, RS-422, RS-232, SPI, I²C, and lower-power LAN
- PLC analog and digital I/O modules
- Industrial automation and process control
- Isolated gate driver power supplies
- AC motor drives, UPS, and solar inverters
- Polyphase energy meters, protection relays, and IEDs
Available options include:
- Compact SMT packages
- Low-profile construction
- Functional or reinforced insulation
- Wide operating temperature capability
- Compatibility with common push-pull controller families
These transformer families provide designers with practical options for integrating isolated power into interface, control, and gate-driver circuitry while meeting electrical and mechanical design requirements.
Transformers for AC/DC Converters
Offline AC/DC power supplies present a unique set of challenges, including reinforced insulation, universal input operation, leakage inductance, EMI performance, and compliance with electrical safety requirements. Würth Elektronik AC/DC transformers are designed for these applications, from compact auxiliary supplies to flyback converters used in mains-powered equipment.
Typical applications include:
- Offline flyback converters
- Auxiliary power supplies
- Industrial and consumer SMPS
- LED lighting
- White goods and home appliances
- USB chargers and smart adapters
- Metering, security, and control electronics
Available product families include options for:
- Compact SMT and low-profile construction
- Reinforced insulation and high hipot capability
- Controlled leakage inductance
- Multiple output configurations
- Compatibility with common offline controller ICs
The range allows designers to select transformers that best fit the electrical, mechanical, and safety requirements of their offline power supply.
Gate Drive Transformers
Gate drive transformers provide isolated signal and power transfer for high-efficiency switching systems using SiC, GaN, and IGBT devices. Fast switching speeds, insulation performance, and low interwinding capacitance all influence gate drive performance, making transformer selection an important part of the design.
Applications include:
- Isolated gate drive stages in high-voltage systems
- Fast-switching converter topologies
- Compact SMT gate drive circuits
- Flyback, LLC, half-bridge, and full-bridge converters
- Motor drives, synchronous rectification, battery charging, solar, UPS, telecom, and industrial power systems
Product options include:
- One or two secondary windings
- Multiple package styles
- Basic or reinforced insulation
- Operating temperatures up to +130 °C
- Wide input and control voltage ranges
The product range supports a variety of switching architectures while giving designers options to balance isolation, package size, switching performance, and system reliability.
Current Sense Transformers
Current sense transformers provide isolated AC current measurement for monitoring, protection, and control circuits. They are commonly used where reliable current feedback is needed without adding significant size or complexity to the design.
Applications include:
- AC current detection
- Overload sensing and load-drop detection
- High-frequency current sensing in switch mode power supplies
- Metering and load measurement
- Compact SMD current sensing designs
Available products support applications such as:
- Switch mode power supplies
- Metering
- Load measurement
- Protection and fault detection circuits
With compact low-profile construction, SMD assembly options, operating frequencies up to 1 MHz, and primary current ratings up to 40 A, these transformers provide practical current sensing solutions for space-constrained designs.
PFC Chokes
Active power factor correction stages require magnetic components that balance efficiency, thermal performance, EMC behavior, and mechanical constraints. Würth Elektronik PFC chokes are available for different operating modes, power levels, and package requirements.
Applications include:
- Mains-connected power supplies
- Lighting
- Industrial and medical AC/DC
- Telecom power supplies
- Solar inverters
- Fixed EV chargers
Available product families include:
- Compact low-profile designs
- Low DCR constructions for reduced losses
- Options optimized for thermal performance
- Support for both DCM and Boost CCM PFC topologies
These chokes allow designers to select magnetic components matched to the converter topology, power level, thermal requirements, and available mechanical envelope.
