Learn the physics. Ship the design.
A curated path through the basics, the eight-topology workflow and deeper research notes. Built for engineers new to WPT and for practitioners tuning production coils.
Start with first principles.
Your first coil pair
Set up two coaxial loops, run the solver and read the coupling.
Helmholtz vs DTC
Why the eight topologies look the way they do — uniformity at the centre versus high-coupling at distance.
Coupling factor, k
The single number every WPT design lives or dies on. What it means, how it scales with spacing, and why ½ is hard.
Reference articles.
The Learn hub answers one engineering question per article, with worked numbers and plain-language guidance.
Wireless power coil design guide
Designing a coil pair end to end: topology, size, turns, gap, k, Q, compensation, frequency, exposure limits and fabrication, with worked numbers.
CircuitWPT compensation topologies: SS, SP, PS, PP, LCC
When to use each resonant network, and what frequency splitting means in practice.
CircuitWPT efficiency and the kQ figure of merit
Why Q matters as much as k, skin depth and litz wire.
StandardsWireless charging standards and exposure limits
Qi, SAE J2954 and AirFuel Resonant frequencies and power classes, and the ICNIRP and IEEE C95.1 exposure limits.
Run a real simulation.
Your first simulation in 90 s
Pick a topology. Set geometry. Run. Export. End-to-end on the web app, no setup.
Sweep spacing across 50 frames
Use the parameter-sweep API to render a k-vs-h curve and pin the operating point.
From sim to fab
Walk through the four export targets — PDF, KiCad, DXF, SPICE — and what to drop into your toolchain first.
Inside the solver.
Inside the genetic optimiser
BLX-α crossover, tournament selection, NSGA-II Pareto. How to read the convergence curve and when to restart.
Volumetric field rendering
How the same H-tensor drives 2d_plane, vector_field and 3d_volume modes — and what LOD 0/1/2 actually means.
How results are validated
How the solver is checked against published reference cases, and where the model stops.
Worked examples by application.
EV pads at 85 kHz
SAE J2954 alignment, gap and misalignment trade-offs. Worked example from a square-DTC ground assembly.
6.78 MHz ISM implants
Sub-mm coil design for medical implants — Q targets, coupling under tissue load, regulatory hooks.
Battery-free IoT sensors
Designing the receive coil when budget is microwatts. Rectifier choice, matching network sizing.