Low AC and DC Resistance Inductor Technology

1. Low AC and DC Resistance Inductor Technology • Weyman Lundquist – President and CEO • West Coast Magnetics • April 4, 2007 • International Patent #WO 2005/09630

2. Patented Inductor Technology • Very Low DCR, High Window Utilization • Foil winding • AND Low AC Resistance • AC loss reduction comparable to litz wire • SIGNIFICANTLY LOWER TOTAL LOSSES • Applies to: • Gapped core structures • Idc > 10 amps • Ripple > 5% • Inductors (Chokes)

3. West Coast Magnetics is: • A Manufacturing Driven Organization • Lean since 2005 • 100% on-time delivery • 100% defect free product • A Customer Driven Organization • Service • Engineering Support • A Technology Innovator

4. West Coast MagneticsCompany History • Founded in 1976 in Silicon Valley • Present Ownership 1993 • Open Stockton facility in 1996 • Acquired Mexico Facility in 1999 • New Inductor Technology 2003

5. Company Overview • Stockton, CA • Corporate Headquarters and Manufacturing Facility • Tecate, MX • Production Facility • Custom and Standard Products • Power Transformers: 50/60 Hz to 13.56 MHz • Power Transformers: 1 Watt to 15 kW • Power Inductors to 200 amps • Common Mode Chokes to 200 amps • Current Sense Transformers 60 Hz to 13.56 MHz • RF Inductors to 100 MHz

6. How Does it Work? By cutting away a section of the foil winding in the region of the core gap winding eddy currents are concentrated locally in the region of the cutaway.

7. Experiment: Is the New Technology Really Better? • Objective: A Conclusive Comparison of the New Technology to Conventional Windings • Step 1: Define the Inductor • Inductance 90 uH • Current 40 Adc • Ripple: Triangle wave at 50 kHz • Core: E70/33/32 Epcos N67 material • Gap: 2.64 mm (1.32 mm each center leg) • Turns: 15

8. Experiment: Is the New Technology Really Better? • Step 2: Wind Inductors with Conventional Windings Using Best Practices • Full window • Single layer • Step 3: Determine Winding Losses for each Inductor as a Function of Ripple Magnitude • Step 4: Compare Results to Temperature Rise Data Collected under Load.

9. 400/40 Litz 20/32 Litz Solid Wire Long Cut Prototype Cut Full Foil 20/32 Litz Solid Wire 50/40 Litz Winding Cross Sections

10. Method of Estimating Losses • DCR – Measure voltage drop under 5 Amp DC load. • Core Losses: Derived from Epcos loss curves. • AC resistance – Sweep from 10 kHz to 200 kHz with Agilent 4294A network analyzer • Use Fourier decomposition to translate sinusoidal sweep data to triangular waveform

11. Total Loss Comparison

12. 90 uH 20 uF 10 Ohms 2.5 Ohms 40 A Device Under Test Amplifier Output: 6A P-P Function Generator Temperature Rise Measurement – Test Set Up

13. Temperature Rise Measurement – Results at 15% Ripple

14. Global Market – High Growth Green Energy! • Distributed Power: Wind, Solar and FACTs • Estimated $4.3 Billion in Power Electronic Equipment in 2007 • 15% plus forecasted growth • Hybrid Vehicles • Est. 600,000 in 2007 • 50% plus forecasted growth • Uninterruptible Power Supplies • Estimated $4 Billion in Power Electronic Equipment > 1 kW in 2007 • 7% plus forecasted growth

15. Design Tools • Code for Winding Loss Simulation • Code for Translation of Winding Cross Section into 2D Foil Shape • Code for Prediction of H vs. L vs. Gap for any Inductor

16. Licensing Opportunity • Objective: The widest possible application of the technology. • Develop tools for design support. • Maintain license rate at a level which will lead to widespread use. • Contact: Weyman Lundquist wlundquist@wcmagnetics.com • 800-628-1123

17. Weyman Lundquist, President West Coast Magnetics 4848 Frontier Way, Ste 100 Stockton, CA 95215 www.wcmagnetics.com 800-628-1123 Thank you for your time