Wireless Power Transfer (WPT)

Course 264

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This two day course presents the basics of magnetic coupling and applications to power and data transfer ( Near Field Communication - NFC ). Included topics are, coil and system design techniques, simulation and models, building and testing your prototypes, optimization, experimental characterization and commercial solutions.




Important and basic topics critical to design and/or optimize any WPT system: Why magnetic coupling is useful.- Examples of systems and products with magnetic coupling technology - Near vs far field in electromagnetic waves.- Low and high impedance circuits.- Resistance in DC and AC: skin effect.- Total and partial inductance.- Magnetic coupling and mutual inductance.- Resonance, quality factor and bandwidth.- Broadband versus narrowband applications.- Applying resonance to magnetic field coupling.- Coupling distance.- Voltage, current or power variables.

Applications of magnetic coupling

A very fast review of the wireless coupling applications: Typical diagrams for power and/or data transfer.- Wireless Power transfer (WPT) .- Induction heating . -RFID, Near Field Communications (NFC). Etc..

WPT system architecture

Topologies, block diagrams, and architectures oriented to WPT: WPT standards and global organizations: - Qi charging systems. - TX-RX system architectures and electronic blocks. - Modulation techniques.- Single ended vs differential designs. - The role of buck converter in a WPT system.

Elements for a wireless magnetic coupling system

Components and elements used in the design of any WPT system: Coils (wired and in PCB).- Components for resonance and matching. - Problems in high Q (narrowband loads).- Amplifiers: full bridge v/s half bridge inverters. - Advantages and disadvantages of one over the other.- Components for amplifiers: transistors (FETs) and gate drivers.- Control topics: fixed clock, PWM signal.- Filters and shielding: topologies, commom mode chokes, and ferrites.


Special techniques

Special components and techniques for a successful design: Thinking in efficiency. -Thinking in EMI/EMC.- EMI/EMC reduction techniques for low frequencies: 9KHz-1GHz.- Effect of duty cycle variation.- Effect of rise and fall times in driving signals.- Common mode currents: the effect of a common mode choke.- Mitigation of mismatch in differential designs.- Ferrites- Transient protection

Instrumentation and lab techniques

Tools and techniques to measure and optimize your WPT in the lab: Scopes and time domain . - Spectrum analyzer and frequency domain. - VSWR bridges and tracking generator. - Near field probes. - Escáners. - Tuning strategies.

Design techniques and example

General design process and an example with demos: Qi charging - system design.- Exercise/example: design an entire basic system. - Practical demonstrations.

Target Audience

Engineers interested in WPT and NFC.