Maximizing Wireless Power Performance In Constrained Environments. Michael Gotlieb Vice President of Business Development

Transcription

1 Maximizing Wireless Power Performance In Constrained Environments Michael Gotlieb Vice President of Business Development

2 Wireless Power Since 2009: NuCurrent Standards Based and Proprietary Frequencies Qi & AirFuel Multimode Full Range of Standard & Custom Choices Qi / PMA Rx Frequency independent Complete Modules 11 x 4 mm Rx & Tx Multi Mode Single Mode Certifiable & Friendly versions Single Substrate Transmitters & Receivers Q Factor Up to 400 Tx & 200 Rx Small Form Single Mode Qi & AirFuel Vertical & Flat Charging

3 Agenda Wireless Power Markets Focus: Constrained Environments within Qi, Qi Friendly What Problem Are We Solving? Performance Defined Practical Ways to Maximize Performance Conclusion CONFIDENTIAL 3

4 Wireless Power Markets In Production or In Design Today; Broadening Landscape Discussion Focus Consumer Mobile Phones Wearable, Personal Devices Peripherals; Laptops Medical Hearing Aide Sanitized Rechargeable Portable Equipment Automotive In Car Embedded In Car Consumer Device Accessory / Sleeves Mil-Aero Airplane Trays/Seats Soldier Equipment Robotics Infrastructure Office Furniture Coffee Shops Hotels Industrial Wireless Sensor Networks Contact Replacements Power Tools

5 Wireless Power System Environments Highlights of In-Production or In-Design Today Consumer Mobile Phones 0.25mm 0.45mm thin (Coil + Ferrite ) Z gap 3mm Watts Wearable, Personal Devices 0.25mm 0.6 mm thin Z-gap 3 mm+ 1Watt + Flexible Hearing Aide Medical 10-12mm DIA 0.5mm thin Z gap 3 mm <1 Watt Why Portable Wireless Equipment Power Designers Go Thin and Small? +Add Other Product Features +Increase Battery Size +Industrial Design Forces Size +Cost +Retrofitting Existing Products Automotive In-Car Embedded Armrest/Console Pad size 1mm thickness Z gap >10mm (Qi Friendly) 5W 15Watts Accessory / Sleeves 0.3mm mm Z gap 3 mm 5 15 Watts

6 What is Performance? How does it relate to Wireless Charging? That Depends! Top Tier watch To the End User(Wireless Power Industry): Battery Life (Larger Battery, Thin Coil) Charge Time ( Higher Efficiency) Full Featured (Higher Power) In a Sleek Form Factor( Small Footprint Solution) Is Durable, Reliable, Easy Care(wireless power) 6

7 Improving Wireless Power Systems: Where to Focus? Interrelated Stages impact User Experience and Efficiency Wireless Power System DC AC Tx Antenna Rx Antenna AC - DC System Efficiency η System η DC-AC Typical: X η Antenna-to-Antenna X η AC-DC Typical Impactful Areas: 1) FET s / IC 2) Antenna (Design) 3) Rectifier / IC Qi Example 1)Equal Rectifier stage with Improperly Rx/Tx selected antenna makes the P/A work inefficiently thus heat & poor performance 2)Properly selected antena 1. η System (1) = 0.85 X 0.89 X 0.90 ~ 68% 2. η System (2) =0.90 X 0.97 X 0.90 ~ 79%

8 Types of Coil Technologies Standard Wire-wound Litz Wire-wound Standard PCB NuCurrent MLMT PCB Low Frequency No space constraints Low Frequency Tx No environment constraints Low Frequency No space / performance constraints 8 Low and High Frequency Small, Thin, Flexible, Integration possibilies

9 World s Thinnest Form Factors No Reduction in Performance 4.9x Thicker Thickness of 11uH Qi Receivers (mm) x Thicker 3.2x Thicker x Thicker Vishay TDK Wurth Laird NuCurrent *Based on datasheets from Mouser.com ** All coils deliver >70% efficiency for Qi

10 Antenna Performance: Q s and k s Loosely Coupled Need Very High Q Antennas Antenna Equations Equal Performance Considerations Variation of Efficiency with k and Q Keys to Optimal Systems FOM = κ 2 Q TX Q RX Eff = f (FOM) Antenna-to-Antenna Efficiency Q TX =90, Q RX =25 Q TX =300, Q RX =100 Design achieves higher coupling (k) Design + CoolSkin Technologies TM delivers higher Q Typical operating point of loosely coupled applications (e.g. Resonant, Qi Friendly ) Coupling Coefficient, k - Typical operating point of tightly coupled applications (e.g. inductive) NuCurrent Inc. 641 W. Lake St. Suite 304, Chicago

11 Need Thin? 3W Qi Solution Without Sacrifice Rx Coil Total thickness Size L (uh) ESR (ohm) Q Coupling Mutual inductance Efficiency (power) 3W Rx 0.80 mm 30mm % (3W), 79.4% (2W) PNC01-R126W mm 30mm % (3W), 78.7 % (2W) 030-0R45 Electrical parameters are measured at 100 khz PNC01-R126W R45 Nucurrent coil is 56 % thinner than initial 3W Rx coil Thickness = 2.00 mm L= 6.24 uh ESR= 0.11 ohm Q= 34 Size = 30 mm OD 3W Tx Coil Stack Up Ferrite Rx coil Spacer (1.5 mm) Tx coil Ferrite Strictly Confidential

12 What is Important to Your System? 15W Qi Solution Coil Total thickness Size L (uh) ESR (ohm) Q Coupling Mutual inductance (uh) Cs placed Power 15W 15 W Rx 0.6mm 40 x 50mm nf 15 W 86.1% 86.1% Coil PCB 0.35 mm 50 x 50mm nf 15 W 80.5% 82% Peak Efficiency Coil UltraThin 0.25 mm 50 x 50mm nf 15 W 78.8 % 79.7% Electrical parameters are measured at 100 khz Nucurrent is 58 % thinner Stack Up Ferrite Rx coil Spacer (3.4 mm) Tx coil Ferrite Tx coil : Medium power Rx Coil : PNC11-R90L01E R25 Strictly Confidential

13 Integrating full Solutions on the Same PCB Small Form Factor High Volume, Cost and Space Constrained Environment The electronics, antenna, is single-mode Qi. Could have NFC EXEMPLARY STANDARDS-FRIENDLY SYSTEM Dimensions: 17mmX48mmX0.7 mm (PCB + shield) Qi/PMA capable wireless charging module Target ~ 1 W, max capability > 3.5 W ALL PCB (no wires) Custom Tuning CONFIDENTIAL 13

14 Maximizing Performance Conclusion Knobs to Adjust Main Systems Design Knobs Coil FETs and IC Tx Rectification Rx Qi & Qi Friendly Systems Coupling OD/ID, Rx/Tx pairing Layout & FET Selection Integrated into the IC/ IC Selection 14