Advantages of the IWAS coil
The IWAS receiver coil is
constructed based on the patented IHLP technology. It utilizes a
magnetic wire coil placed on top of a composite material core/shield.
This provides the IWAS receiver coil with certain advantages over
Shield Material Characteristics
- High permeability shielding for wireless charging receiving coils
1. Permeability: to 24
2. Resistivity: > 10 MΩ at 100 V
3. Core loss: 4000 mW/cc at 500 gauss, 250 kHz
4. Magnetic saturation: 50 % at 4000 gauss (to 350 Oe)
- High saturation powered iron - not affected by permanent locating magnets
- Durable construction
- Elimination of charging interface connectors that can corrode or leak when cleaning/disinfecting
- A single charging location for multiple devices regardless of manufacturer
- The ability to make custom sizes and shapes to fit almost any WPC compliant device.
- Compliant to RoHS Directive 2002/95/EC
IWAS-4832FF-50 - 1€ WAS-3827EC-50
IWAS style receiver coil is manufactured starting with a very thin,
pressed powdered iron wafer. A special, flat, magnet wire coil designed
to minimize copper losses and maximize flux transfer is assembled onto
the wafer. Leads from the coil are stripped and tinned for easy
connection into the customer’s circuit. The completed IWAS receiver coil
is then integrated into the back cover of a portable medical electronic
device and connected to the communication/charging circuitry. The
device is now ready to be placed on any Qi compliant charging station.
Wirelessly charged medical devices will
require independent laboratory verification for electromagnetic
compatibility. Some of the standards that are applicable are:
- FFC parts 15 and 18
- IC ICES-001
- IC Radio Standards Specification (RSS)
- EU EMC Directive
- R&TTE Directive
There are numerous independent labs available to perform these tests.
charging is no longer at our doorstep, it has a foot in the door. It
started with smaller devices, like cell phones, and is now expanding to
medical and other portable devices – even electric vehicles. The IWAS
receiver coil will open the door to efficient and reliable charging of
your mobile medical devices.
About the author
Schade is Senior Product/Process Engineer at Vishay Intertechnology,
Inc., Inductors Division. He can be reached at Nick.Schade@Vishay.com.