Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras
Wireless Charging Unit Including Tunnelling Magnetoresistance Sensors
Categories for this Invention
Technology: Tunnelling Magneto Resistance (TMR) sensors for detecting type of charging pads.
Category: Wireless charging
Industry: Automotive
Application: Electric Vehicle
Market: The global market size of the electric vehicle (EV) market is projected to grow from $500.48 billion in 2023 to $1,579.10 billion in 2030 at a CAGR of 17.8% in forecast period, 2023-2030.
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Problem Statement
- Environmental concerns over fossil fuel-operated ICE vehicles have sparked interest in electric vehicle (EV)-based transportation infrastructure.
- EVs are environmentally sustainable due to their independence from carbon-based fuel, eliminating carbon by-product emissions.
- However, effective charging technologies are needed to address safety, operational costs, and driving range concerns.
- Inductive Power Transfer (IPT) has gained popularity due to its improved safety and convenience, but conventional wireless charging units struggle to identify charging pad types and differentiate between chargeable devices and non-chargeable metallic objects, leading to power wastage.
- A wireless charging unit is needed to address these issues.
Technology
- The Proposed wireless charging unit Tunnelling Magnetoresistance (TMR) sensors, a system that transmits wireless power to a secondary pad of a wireless chargeable device.
- The Unit consists of a
- Primary pad with coils,
- A sensor pad above it, and
- A plurality of TMR sensors positioned at different locations to identify the type of secondary pad by sensing changes in magnetic field.
- The Primary Pad can be a
- Bipolar Pad (BPP), Circular Pad (CP), or Double-D Pad (DDP).
- wherein the magnetic field is produced by the one or more primary coils of the primary pad.
- The wireless charging unit can detect the presence of a metallic object in front of the primary pad.
Key Features / Value Proposition
- Wireless Charging Unit for EV Applications.
- Automatically detects and identifies secondary pad in EVs.
- Switches charging pad mode based on secondary pad type.
- Detects metallic objects to prevent accidental activation.
- Utilizes frequency bifurcation and magnetic field change pattern for pad detection and identification.
- Requires no expensive components and can be easily integrated into BPP pads.
- Based on magnetic sensing, less affected by dust, snow, oil, and humidity.
- Can transfer power to a bipolar pad primary, circular pad, or double-D pad secondary.
- Prototype sensor system integrates TMR sensors for magnetic flux density change.
- Tested in detail to identify secondary pad type under various conditions.
Questions about this Technology?
Contact For Licensing
sm-marketing@imail.iitm.ac.in
ipoffice2@iitm.ac.in
Research Lab
Prof. Boby George
Department of Electrical Engineering
Intellectual Property
- IITM IDF Ref. 2196
- Patent No: IN 536149
Technology Readiness Level
TRL-4
Experimentally validated in Lab