APEC 2014 Session IS2-3-4

Jim Marinos EVP Payton Planar Magnetics ltd

Planar Structure Planar Structure

• Better Core Utilization • Lower DCR • Lower Leakage • Less Skin Effect • Less Proximity losses • Less EMI • Reduced Size and Weight

224 Watt Planar Transformer

224 Watt Toroid Transformer

• Does size matters?

• Does repeatability matters?

Designs for Conduction Cooling

Design Objectives

Size

Power Density

Efficiency – Highly Constant Parasitics

Value for Cost

There are two main elements in the design of a Planar Magnetic Structure

1) Control of Parasitics:

2) Optimum size and Frequency depends on the maximum environmental temperature

Conduction Cooling Methods

Thermal Management of Planar Magnetics for Automotive Applications

• Core Temperature Reduction

• Surface Interface Improvement

• 4 Sides Cooling

• Winding Cooling

Conclusions

• Economic Benefits

• Core Size Reduction

• High-tech Insulation Material Reduction

• Thermal Benefits

• High MTBF

Payton

America

Inc

jim@paytongroup.com www.paytongroup.com