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9 wireless powertransfer projectsPDF1AccelerateyourInnovationinnovation 2017 PhilipsServices. All rights reserved.

9 wireless power transfer projects PDFExploring possible applications of wireless power transmissionTo give you a taste what’s possible in wireless power transferapplications, we’d like to share some examples of this technology incombination with others, such as actuation, communication andsensing. The power levels we have worked with range from μWattto hundreds of kWatt. During the past decade, we have applied thiswireless power transmission technology to projects aimed at solvingvarious problems such as: Sending power to sensor nodes which are not reachable. Charging sealed batteries that work in harsh conditions wherecabling is troublesome.2 Sending power to moving or rotating parts. Driving moving or rotating parts wirelessly. Modulating wireless power signal to carry data bidirectionally. Sensing position via the wireless power channel. Sending power via walls, glass or other obstacles. Getting rid of cables for the ease of operators of medical devices. 2017 Philips Innovation Services. All rights reserved.Dr. ir. Aditya MehendaleSenior Architect MechatronicsPhilips Innovation ServicesHigh Tech Campus 345656 AE EindhovenNetherlands

Wireless power transfer table of contents1.Wireless movable spotlight2. Rotational system with high-powerWPT3. Remote sensing applications4. Wireless traffic cone charging5. Wireless power up of a sensor node ina tire6. Wireless universal power plug7. Contactless powered linear motors8. Power and data over light9. Wireless ultrasonic power transfer3 2017 Philips Innovation Services. All rights reserved.

1.Wireless movable spotlightRobust and low-cost power transfer, combined with a pan/tilt actuatorApplicationThe 2D electromechanical actuator in combination with wirelesspower transfer to allow remote powering and repositioning ofspotlights.ChallengeDesign and development of a wireless powered 2D actuatorcapable of /- 30 degrees of movement in both x and y directions.The actuator is controlled by a touchpad or mobile phone app.InnovationThe magnetics-assembly intended for power transfer has beengiven a secondary function – to create a stick-slip based pan/tiltmechanism.This mechanism can orient the luminaire, while adding no extracomponents or mechanical connections to the lamp itself, andrequires no power when inactive.The wireless actuation and integral sensing, combined withintelligent control and a user interface, is an interesting solution forapplications that require occasional movement.Key specifications 4Power: 5 WSwitching frequency: 80 kHzPower transfer efficiency: 50%Type: electromagnetic couplingAdditional technology: electromechanical 2D actuation 2017 Philips Innovation Services. All rights reserved.

2.Rotational system with high-power WPTHigh-power WPT to minimize sound and wear for CT scannersApplicationSlip rings usually provide the high level of power required bygenerators in the high-speed rotational units of CT scanners. Thishigh-power WPT system is intended to replace these slip rings.ChallengeDesigning wireless power transfer system for high-power rotationalsystem. The conversion efficiency is critical.InnovationVery high-power and high-speed rotational interface by means ofmodular magnetic elements to create a robust – yet lightweight andefficient – power path.Key specifications 5Power: 200 kW peak, 100 kW continuousSwitching frequency: 20 kHzPower transfer efficiency: 98% for the couplers, 90% end-to-endType: electromagnetic couplingAdditional technologies: high rotational speed of 300 rpm,separate optical data links (Gbit/s) 2017 Philips Innovation Services. All rights reserved.

3.Remote sensing applicationsCompact customized power transfer and datachannel for sensors in rotating machinesApplicationWireless power transfer system designed for an automotive application.The sensor data from the rotating part (wheel) is transferred back via thesame wireless link.ChallengePower and data is to be transferred using a singular inductive coupler.Severe volume restrictions on the coils and circuitry.InnovationWireless power to, and remote sensing from, a rotating unit is achievedby developing compact PCB-based transmitter and receiver coils.Key specifications6 Power: 1 W Switching frequency: 100 kHz Power transfer efficiency: up to 80% depending on the distance Type: electromagnetic coupling Additional technologies: PCB coils, rotational system 2017 Philips Innovation Services. All rights reserved.

4.Wireless traffic cone chargingConvenient workflow with wireless charging for smart traffic conesApplicationWireless charging unit for safety perimeter system intellicone.Developed for highway maintenance and construction for theEuropean Safelane project.ChallengeDevelop a wireless system for in situ recharging of smart-sensorenabled batteries in a lantern: Increase reliability of the lanterns by removing all externalconnectors. Create a lean workflow by establishing the wireless connectionduring storage-stacking.InnovationThe implementation of wireless charging makes for a robust andeffortless way to keep the batteries topped up. The intellicones improve safety for road workers compared topassive traffic cones. A sustainable solution (as opposed to disposable batteries) byimplementing rechargeable batteries that require no extra usereffort.Key specifications 7Power: 5 WSwitching frequency: 100–200 kHzPower transfer efficiency: 70–80%Type: electromagnetic couplingAdditional technologies: PCB coils 2017 Philips Innovation Services. All rights reserved.

5.Wireless power up of a sensor node in a tirePowering a sensor node across a large distanceApplicationChallengeThis long-range WPT system has been designed for anautomotive application: to power a sensor node within arotating tire.The unique challenge of this project is to transfer poweracross large distances (greater than 500 mm).InnovationLarge-distance power transfer achieved from a stationarypart to a rotating system. The large transmitter coil is located in the stationary part ofthe vehicle. A compact receiver coil, packaged together with the sensornode, is inserted inside the tire.8 2017 Philips Innovation Services. All rights reserved.Key specifications Power: 5 mWSwitching frequency: 100 kHzPower transfer efficiency: negligible, input power largeType: electromagnetic couplingAdditional technologies: sensor node and receiver coil in acompact package

6.Wireless universal power plugIsolating AC mainsApplicationWireless universal power plug for home or garden applications thatuse AC mains (220 V). This plug can transform electrical power fromconventional wall outlets to work without galvanic contacts.ChallengeDesigning an efficient, hermetically sealed, compact wireless powerplug operating at mains voltages.Innovation Connection through obstacles (glass, wall, etc.). No bare pins for safe use in e.g. children's rooms, kitchens, wetenvironments. Also allows safe outdoor use of conventionalgarden tools or lights in the rain. Better robustness of power connection. Ease of connection via magnetic connection. Convenient and recognizable form factor, with the power sourceand the connected appliance being agnostic towards thepresence of the wireless plug.Key specifications 9Power: 70 W peak, 50 W continuousSwitching frequency: 100 kHzPower transfer efficiency: around 90% depending on distanceType: electromagnetic couplingAdditional technologies: magnetic connection, all electronics inthe compact plug design 2017 Philips Innovation Services. All rights reserved.

7.Contactless powered linear motorsContactless power across a long-stroke XY stageApplicationThe linear motors of an XY stage has been powered wirelesslywithin a WICOR project (Wireless Interconnected Robot). Industrialautomation systems such as pick-and-place, wafer processingequipment, and any application requiring reliable wireless powertransfer to the moving axes can benefit from this technology.ChallengeCreate a contactless alternative for cable slabs to enable actuationand metrology of long-stroke XY stages to get: No cable-slab wear No cable-slab dynamics Space savingsInnovationThe primary coil of the inductive coupler is elongated in thedirection of movement, while the core and secondary coil travelfreely with the stage over its stroke. This modular coupler may becascaded for each motion axis of the stage.This technology is well adaptable for different stage concepts bymerely changing the geometry of the coupler. Its scalability allowsfor diverse power requirements. It exhibits a good efficiency andfavorable EMC.10 2017 Philips Innovation Services. All rights reserved.Key specifications Power: y-axis: 600 W peak/300 W continuous,x-axis: 100 W peak/50 W continuous Switching frequency: 100 kHz Power transfer efficiency: 90% Type: electromagnetic coupling Additional technologies: linear motors, XY stage,elongated coupler transformer coils, optical datatransfer

8.Power and data over lightPower transfer over a light beam, over a large distanceApplicationBased on an invention and research conducted by Philips ResearchLaboratories, we have built a tech demonstrator to show thetransfer of substantial power and data over light (a free-space linkin this case). This technology can be used to energize and readsensors or actuators over large distances without cables.ChallengeWPT where electromagnetic interference is undesirable, or a longdistance needs to be bridged over a free-space link, with limitedspace available for a transducer.Innovation Long-distance power transferBidirectional communicationGalvanic isolationOff-the-shelf componentsHigh optical quantum efficiency (compared to IR systems)High data rates at little extra costRelatively high power and voltageDirectly generated 3 V DC can power processors, sensors withoutconvertorsBased on original research ofDr. Martin B. van der MarkPhilips Research12 2017 Philips Innovation Services. All rights reserved.Key specifications Power: 100 mW Switching frequency: n/a (DC) Power transfer efficiency: 40% optical; 12% endto-end Type: power and bidirectional data over light Additional technologies: communication 100kbps with the native devices; higher data ratespossible if separate communication lasers are used

8.Power and data over lightPower transfer over a light beam, over a large distanceBased on original research ofDr. Martin B. van der MarkPhilips Research12 2017 Philips Innovation Services. All rights reserved.

9.Wireless ultrasonic power transferPower transfer over soundwaves providing power to buried, embedded or submergeddevicesApplicationWe have identified ultrasonic power transfer as a potential optionfor electromagnetic WPT, suitable for several applications such ascharging wireless medical implants and sending power tounreachable sensor nodes. Ultrasonic power transfer is suitableinside a medium such as water, polymers, or the human body. Air isusually not an effective medium for ultrasonic WPT.ChallengeWPT where electromagnetic interference is undesirable, or asuitable medium for electromagnetic power transfer is not available;no optical path to the target.InnovationLong-distance power transfer can be achieved inside media such aswater, human tissue, concrete, girders, soil, glass, metal, plastics orother suitable materials.Piezoelectric transducers are used as transmitter and receiver units.In order to increase the efficiency, the type of the piezo elementsand the distances should be optimized.Key specifications 13Power: 100 mW outputSwitching frequency: 1.6 MHz (Ultrasonic frequency)Power transfer efficiency: 15 %Type: ultrasonic (acoustomechanical) power transfer via mediumAdditional technologies: piezoelectric transducers 2017 Philips Innovation Services. All rights reserved.

1 2017 Philips Innovation Services. All rights reserved.