Planar Transformer

A Planar Transformer is a compact high-frequency transformer designed for efficient power conversion, voltage transformation, and electrical isolation in modern power electronic systems. Unlike conventional wire-wound transformers, it uses a low-profile magnetic core with flat copper windings formed by PCB conductors or thin copper foil, enabling a thinner and more compact construction.

The planar structure provides close magnetic coupling, low leakage inductance, high power density, and efficient thermal management. Its compact form factor makes it well suited for high-frequency switching power supplies and other applications where space, efficiency, thermal performance, and reliable electrical isolation are important.

A Planar Transformer operates through electromagnetic induction between primary and secondary windings. When an alternating or high-frequency switching voltage is applied to the primary winding, it generates a changing magnetic flux in the planar magnetic core. This changing magnetic flux induces a voltage in the secondary winding, enabling voltage conversion and galvanic isolation between the input and output circuits.

The flat winding structure allows the primary and secondary conductors to be positioned closely and precisely around the magnetic core, improving magnetic coupling and helping reduce leakage inductance. The high-frequency design also supports compact power conversion, while the planar construction provides a short thermal path for effective heat dissipation.

• Low-Profile and Compact Design – Reduces transformer height and saves valuable PCB space in compact electronic systems.
• High Power Density – Delivers efficient power conversion within a small physical footprint.
• Low Leakage Inductance – Close coupling between windings helps reduce unwanted leakage energy and supports efficient high-frequency operation.
• Excellent Thermal Performance – Flat windings and a compact core structure facilitate heat dissipation and help maintain stable operating temperatures.
• High-Frequency Operation – Designed for modern switching power supplies and high-frequency power conversion applications.
• Flexible Custom Design – Winding configuration, turns ratio, core dimensions, electrical ratings, and mechanical profile can be tailored to specific application requirements.

• Servers and communication power supplies
• High-frequency switching power supplies
• AC-DC and DC-DC converters
• Electric vehicle (EV) chargers and onboard power systems
• Battery management and energy storage systems
• Industrial power supplies, UPS systems, and medical equipment
• Laptops, LED drivers, and portable power devices

Planar Transformers are widely used where compact size, high power density, efficient power conversion, thermal performance, and electrical isolation are required in advanced power electronic systems.
 

• Space-Saving Construction

The low-profile planar structure helps reduce overall system size and enables more efficient PCB utilization.

• Efficient Power Transfer

Optimized magnetic coupling and low leakage inductance support efficient high-frequency energy transfer.

• High Power Density

Compact construction allows more power to be handled within a smaller package, making it suitable for space-constrained designs.

• Effective Thermal Management

The flat winding structure provides efficient heat dissipation and supports stable operation under demanding power conditions.

• Design Flexibility

Electrical and mechanical parameters can be customized according to voltage, current, power, frequency, isolation, and available installation space.

• Suitable for Advanced Power Electronics

Well suited for high-frequency switching architectures where efficiency, miniaturization, and reliable isolation are essential.

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