Wireless Power Transfer And Charging

One area of wireless power transfer in Automotive for application in seats, doors, electric vehicles, self-driving cars and other applications is getting more prominence.

Microchip Electronics has developed a great solution that can be integrated into transmitter and receiver to create a high power wireless power transfer module with 92%+ efficiency – Typical dsPIC^TM based implementation.

Please contact Microchip or write to designhmi@gmail.com for more information.

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Wireless power involves the transmission of energy from a transmitter to a receiver via an oscillating magnetic field. Direct Current (DC) supplied by a power source, is converted into high frequency Alternating Current (AC) by specially designed electronics built into the transmitter.

The alternating current energizes a copper wire coil in the transmitter, which generates a magnetic field.  Once a second (receiver) coil is placed within proximity of the magnetic field, the field can induce an alternating current in the receiving coil.

Electronics in the receiving device then converts the alternating current back into direct current, which becomes usable power.

Courtesy https://powerbyproxi.com/wireless-power/

The three main technologies that apply to HMI Devices are:

1. Inductive coupling through wire coils used in applications like electric tooth brush and razor battery charging, induction stovetops and industrial heaters.
2. Resonant inductive coupling through tuned wire coils, lumped element resonators used in applications like charging portable devices (Qi), biomedical implants, electric vehicles, powering busses, trains, MAGLEV, RFID, smartcards.
3. Capacitive coupling with metal plate electrodes used for charging portable devices, power routing in large-scale integrated circuits, Smartcards.

Courtesy https://en.wikipedia.org/wiki/Wireless_power_transfer

Wireless charging is now what I would call a mature industry with multiple suppliers. The basic feature is identical with two basic differences:

• Directly coupled where the iPhone must be in line with coil.
• Indirectly coupled which allows for certain degree of misalignment.
• Efficiencies as I understand are now above 90%.

http://www.kington-ch.com/index.php/en has developed multiple wireless charging designs as shown above.

However, need to take those designs to create a distinction that meets customer expectations going forward in 2019.

There are two parallel development paths – directed towards imbedded automotive for potential integration in 2021 MY vehicles and validation of the technology in aftermarket product planned for 2018. One area automakers are considering is wireless power transfer between in car sub-systems like seats.

Next steps as below:

1. Identify features for wireless charging module to create a distinction.
2. Create design with industrial design rendering.
3. Start PUSH through Design HMI WEB and other email resources.
4. Complete concept prototype.
5. Push through digital and other sources to get production orders.
6. If all goes well get first production orders.
7. Start getting enquiries from OE’s for in vehicle application based on work done.

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For further information Click Power by Proxi

Miniaturizing loosely coupled wireless power for integrating in constrained CE devices – 3D transmitter providing freedom of charging in X,Y and Z axis (360⁰) maximizing the customer experience.

Harmonization Control™ delivers industry application features:

1. Loosely Coupled, real world coupling for flexibility in 3D orientation (x, y, z), stationary or rotating
2. 1 : 1 or 1 : Ability to charge one to multiple devices simultaneously
3. Effective heat management & industry leading true efficiency exceed many cable based power supplies
4. Foreign object detection
5. Scalable architecture – miniaturized ICs and watts to kw’s.
6. Proxi-Ring™ – frictionless and contact free slip ring, supplies power to rotating, highly mobile industrial equipment.
7. Proxi-Loom™ – power multiple devices from a single track without physical contact, complex wiring loom replacement. 
8. Proxi-Com™ – ‘invisible wire’ technology for wireless communication (control and data) and supports common industrial digital and analogue protocols.

 

 

 

Proxi-Module platform is a modular wireless power and data system enabling anyone to adapt and integrate wireless power effortlessly into their products.  The modular system design achieves end to end efficiency of 91%.

The Proxi-Module is CE and RoHS certified and FCC compliant, enabling customers to quickly implement wireless power into their products without the uncertainty and cost of achieving compliance themselves.

The Proxi-Com directly integrates with the Proxi-Module platform to provide seamless conversion of wired data to wireless. The first release supports: CAN bus, Ethernet & GPIO.  Support for Serial (RS232/422/485), 4-20mA, 0-10V & IO-Link planned.

Please click https://powerbyproxi.com/products/proxi-module/ for more information.

12W Wireless Power Connector: Potential applications are for power transmission for harsh, moving and wet environments, true zero insertion force power connector and power and data transfer through glass and plastic to maintain hermetic seals.

For best efficiency transmission distance is recommended at around 12mm.

1. 12 Watt wireless power connector (0.5A @ 24Vdc) from 0-7mm transmission distance.
2. Plug and play modular system to replace wired power 4pin/12pin connectors.
3. Transfer power through any nonmetallic material including liquids and solids.
4. Highly corrosion and water proof – immersion rating of IP67.
5. Integrated wireless data – Unidirectional GPIO (2 or 8) (Rx to Tx) mode or Bi-directional IO-Link mode

Proxi-Module™ 100W: The Proxi-Module™ modular design allows engineers to tightly integrate Wireless Power into more products with design freedom.   No upfront development (NRE) fees and delivery risk. Key electrical specifications:

• Transmitter Input: 24V, <6A.
• Receiver Output: 24V, 100W (max).
• IPT Frequency:
• Operating Efficiency: >90% @ 100W
• Operating Temperature: -40 to 70C

Power transfer efficiency is around 90% at distance of around 12mm. It seamlessly integrates with the Proxi-Module to convert standard wired interfaces to wireless with dynamic pairing.

• The transparent conversion of wired data interface to wireless allows you to eliminate the need for all cables including power that restrict your design, to provide true mechanical separation.
• It can pair with any matching receiver when the Proxi-Module power coils are placed within their transmission distance enabling instant power and data connectivity.

Wireless Charging design on German Luxury car OE from www.kington-ch.com  with 3 coils 5W power and designed to Qi standards.