Geoff Bennett Miles Hancock Drew Jennings.  Problem Description Novel Current Sensor Transmission Line Application Design Specifications Coreless Isolated.

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Presentation transcript:

Geoff Bennett Miles Hancock Drew Jennings

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

Current Technologies Rogowski CoilHall Effect Sensor

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

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

R1(GMR)

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

a1 a2 a3 a4 b1 b2 b3 b4 GMR a1 a2 a3 a4 b1 b2 b3 b4 GMR 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

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

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

Purchase Order List #DeviceDigikey Part #ManufacturerUnit CostQuantityCost 1EMI Casing NDBud Industries$ Blackfin Ezlite Kit (DSP) ADZS-BF518F-EZLITE-NDAnalog Devices$ Power Chip NDTexas Instruments$ GMR sensor NDNVE$6.0815$ Prototyping Board NDTwin Industries$13.783$ Voltage referenceLM285Z-1.2NS-NDNational Semiconductor$ Instrumentation AmpINA118P-NDTexas Instruments$ Capacitor (470 pF) NDKemet$0.2820$5.60 9Capacitor (0.1 µF)P925-NDPanasonic$0.0920$ Resistor (7.5 kΩ)7.5KADCT-NDYageo$0.6220$ Resistor (100 kΩ)100KADCT-NDYageo$0.6220$ Power Transistor IRFU3303PBF-ND International Rectifier$1.054$ Soldering Iron TipsPTS7-NDCooper Industries$3.303$9.90 Total:$789.01

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

GMR Applied Field

a1 a2 a3 a4 b1 b2 b3 b4 GMR a1 a2 a3 a4 b1 b2 b3 b4 GMR 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

a1 a2 a3 a4 b1 b2 b3 b4 GMR a1 a2 a3 a4 b1 b2 b3 b4 GMR 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