1. Geoff Bennett Miles Hancock Drew Jennings

2.  Problem Description Novel Current Sensor Transmission Line Application Design Specifications Coreless Isolated Detection  Deliverables AC Current Sensor Sensor Designs Testing Data

3. Current Technologies Rogowski CoilHall Effect Sensor

5.  Emerging Technology Used in Hard Drives Recently Commercially Available Proven in other applications  So How Does it work?

6. Electron Spin direction changes in the direction of the applied magnetic field

7. http://mrsec.wisc.edu/Edetc/IPSE/educators/activities/gmr.html

8. R1(GMR)

9.  EMI Shielding  Physical layout of GMR’s  GMR biasing with current trace

10. 1 2 3 4 5 6 7 8 a1 a2 a3 a4 b1 b2 b3 b4 GMR 1 2 3 4 5 6 7 8 a1 a2 a3 a4 b1 b2 b3 b4 GMR 1 2 3 4 5 6 7 8 a1 a2 a3 a4 b1 b2 b3 b4 GMR Flux Collector Current Bias Conductor runs on top of GMR's. This is designated by the doted lines. GMR

11.  True RMS calculation  Real-time digital filtering  Hysteresis calibration Digital Signal Processing

12. http://www.ifw-dresden.de/institutes/imw/sections/26/magnetic-films-folder/hard-magnetic-films/nd-fe-b-films

15. Rogowski Coil Hall Effect MEMS Bill of Materials Part Ordering GMR Faraday Effect Radical Ideas Timeline Physical Design Filter Design Noise Correct Magnetometers Signal Analysis Idea Matrix Miles Hancock Geoff Bennett Drew Jennings

16. Purchase Order List #DeviceDigikey Part #ManufacturerUnit CostQuantityCost 1EMI Casing377-1604-NDBud Industries$51.801 2Blackfin Ezlite Kit (DSP) ADZS-BF518F-EZLITE-NDAnalog Devices$538.311 3Power Chip296-22673-5-NDTexas Instruments$9.501 4GMR sensor391-1002-NDNVE$6.0815$91.13 5Prototyping Board438-1025-NDTwin Industries$13.783$41.34 6Voltage referenceLM285Z-1.2NS-NDNational Semiconductor$1.051 7Instrumentation AmpINA118P-NDTexas Instruments$9.601 8Capacitor (470 pF)399-4241-NDKemet$0.2820$5.60 9Capacitor (0.1 µF)P925-NDPanasonic$0.0920$1.82 10Resistor (7.5 kΩ)7.5KADCT-NDYageo$0.6220$12.38 11Resistor (100 kΩ)100KADCT-NDYageo$0.6220$12.38 12Power Transistor IRFU3303PBF-ND International Rectifier$1.054$4.20 13Soldering Iron TipsPTS7-NDCooper Industries$3.303$9.90 Total:$789.01

18.  Why is it a good design? Cost, Safety, Size, Installation, Accuracy  Additional Functionality Power Calculation Very High Current Systems

19. GMR Applied Field

21. 1 2 3 4 5 6 7 8 a1 a2 a3 a4 b1 b2 b3 b4 GMR 1 2 3 4 5 6 7 8 a1 a2 a3 a4 b1 b2 b3 b4 GMR 1 2 3 4 5 6 7 8 a1 a2 a3 a4 b1 b2 b3 b4 GMR Flux Collector Current Bias Conductor runs on top of GMR's. This is designated by the doted lines. GMR

22. 1 2 3 4 5 6 7 8 a1 a2 a3 a4 b1 b2 b3 b4 GMR 1 2 3 4 5 6 7 8 a1 a2 a3 a4 b1 b2 b3 b4 GMR 1 2 3 4 5 6 7 8 a1 a2 a3 a4 b1 b2 b3 b4 GMR Flux Collector Current Bias Conductor runs on top of GMR's. This is designated by the doted lines. GMR