PowerbyProxi > Articles by: PowerbyProxi

Qi Wireless Charging and Cardiovascular Electronic Devices

July 12, 2016 / 0 Comments / 65 / Consumer Electronics Solutions
qi-ced-blog

We have borrowed this article taken from Wireless Power Consortium blog.  For information on our stance on Wireless charging standards, visit our standards page.

As new classes of electronic devices like phones or wireless chargers are introduced to the market — especially those devices that use radio frequency electromagnetic fields — it’s critical to verify that these new devices are safe when used by people with medical implants.

The limits for safe exposure of the human body to electromagnetic fields are well understood. In the USA, the FCC has set limits for the strength of electromagnetic fields that may be generated by electronic equipment and the FCC enforces the compliance with their certification program.  Products that carry the FCC mark will not expose your body to harmful electromagnetic fields. The FCC has an excellent website and FAQ devoted to this subject. Other countries have similar regulations, certification procedures, and safety marks.

People who wear implantable electronic devices such as pace makers, defibrillators and deep-brain stimulators will not only be interested in the effect of electromagnetic fields on the human body, but also in the potential effect of electromagnetic fields on their implants.

To this end, a recent study published in the International Journal of Environmental Research and Public Health, the compatibility of a Qi wireless charger and cardiovascular implantable electronic devices (CIEDs) was assessed.  The aim of this study was to assess the electromagnetic compatibility between CIEDs and the magnetic field of a common wireless charging technology. To do so, the voltage induced in CIEDs by an A13-type Qi wireless charger fields were measured and compared with the performance limits set by ISO 14117. In order to carry this out, a measuring circuit was developed that can be connected with unipolar or bipolar pacemaker leads. The measuring system was positioned at the four most common implantation sites in a torso phantom filled with physiological saline solution.

The study found that the induced field is well below the limits set by ISO 14117, even at two cm from the Qi transmitter coil (that is the location with the highest the induced field strength). The field strength drops off dramatically with increasing distance. At the more realistic distance of 10 cm, the induced field is only 2% of the field at 2 cm.

While this was not the first such study, it was particularly thorough and corroborates the findings of previous studies that determined Qi wireless charging does not interfere with CIEDs.

Human Safety — the relationship between frequency and power:

The top design factors that determine safety margins are the system’s operating frequency, the power that the system consumes, and the use of magnetic shielding in the product.  As operating frequency increases the resulting electromagnetic field’s potential to interfere with other electronic devices increases (see e.g. the article on PlanetAnalog.com on “Design Considerations in Modern Wireless Power Transfer Systems: Frequency of Operation”). Similarly, as power consumption increases, the electromagnetic field strength increases and with it, the potential to interfere with other electronic devices.

Why is Qi wireless charging safe?

Qi-compatible products run at a low operating frequency (100 kHz to 200 kHz), and consequently, can deliver high power while remaining well within safe limits. Typical Qi transmitters (chargers) deliver up to 15 watts in a configuration where the transmitter coil and receiver coil are aligned and in close proximity. With this configuration, the field strength declines rapidly with distance, much more rapidly than with, for example, Wi-Fi base stations. This configuration significantly reduces the potential for interference with other electronic devices.

The Qi technology has been in high-volume production since 2010, and there are now hundreds of product types and hundreds of millions of users worldwide. With this market maturity comes a wealth of data that independently confirms the safety of products that use the Qi standard.

Wireless Power for demanding applications

July 7, 2016 / 0 Comments / 54 / Industrial Applications
Ind overview ani

PowerbyProxi continues to examine a world where wireless power is a part of everyday life – a world where the last cable has been unplugged.  In this video we extend our vision to healthcare and demanding, mission critical Industrial environments.  We consider Factory Automation, Wind Turbine, Materials Handling and Marine applications and the added value that Wireless power can play in driving greater efficiency, safety and productivity.

Transcript for the video is included below:

PowerbyProxi continues a look into a world where the last cable has been unplugged.  A world where wireless power promotes efficiency, safety and reliability in mission critical and demanding industrial environments.

In hospitals and healthcare settings, wireless power creates a cleaner and more hygienic environment where devices and machines can be easily re-configured.  There is no longer the hazards associated with power cords which can collect grime and dirt and act as a physical obstacle. Combined Power and Data solutions further improve the ability for medical practitioners to make accurate diagnoses.  Wearable technology and internal devices powered wirelessly, will monitor and transmit information of a patient’s health, aiding early detection and prevention of diseases.  Surgical instruments no longer require physical connectors, enabling hermetical sealing for all tools and contributing to a more sterile and safer operating environment.

Wireless Power also provides opportunities to drive greater efficiencies in manufacturing environments.  Without the masses of cabling required to power multiple machines and automation, factory lines and sensor networks can be easily reconfigured to adapt to changing volumes and workflows.  Similar to hospitals, removal of the power cable has created a more sterile environment for cleanroooms – reducing the risk of product contamination.

Significant benefits are also seen in industries where physical connectors are high maintenance, for instance in Marine environments, where contactless power transfer provides for robust and repeatable recharging of subsea vehicles and sensors. OR Oil drilling and Wind turbine applications where wireless offers a reliable and long-lasting solution to supply power to rotating equipment.  Even in the warehouse where the logistics of charging is problematic, greater efficiency and less downtime is achieved.  Consider for instance, opportunistic wireless charging of automated and electric vehicles, OR power and data transfer on moving equipment to enable added intelligence on lift trucks.  Even smaller devices like RFID and Barcode readers can be remotely monitored for battery levels and be set up to initiate charging at certain times.

Wherever the job is considered difficult, dirty or dangerous, wireless power delivers reliable and sustainable power and data transfer.  As a leader in the innovation of resonant wireless power solutions, PowerbyProxi is looking forward to reducing the reliance on physical connectors and finally unplugging the power cable.

Proxi-2D EVK Development Kit now available

February 19, 2015 / 0 Comments / 40 / Consumer Electronics Solutions, Features
EVK-2-e1424372953362-1024x734

PowerbyProxi is delighted to announce the availability of our latest evaluation kit for consumer electronic devices – The Proxi-2D EVK Development Kit

This Development Kit represents the next step in resonant technology with higher efficiency, advanced foreign object detection and Qi v1.1 certification.

The Proxi-2D represents a critical next step in the advancement of the Qi specification and shows consumers the possibility of an integrated, resonant system that is backwards compatible with existing Qi devices.

This release reflects overwhelming demand from our customers and partners to accelerate technology development for greater flexibility and convenience for wireless charging, including extending the existing Qi standard.

The Proxi-2D includes a single transmitter and two receivers.  Both the transmitter and receiver can operate in resonant and Qi mode, and are interchangeable with Qi devices.

Included in the kit are spacers to showcase z height testing of the devices at 3, 5 and 7mm, as well as software to enable real time testing and monitoring of both the transmitter and receiver.

Dual mode functionality enables three configurations – testing of Resonant receivers on our resonant transmitter, Qi receivers on our resonant transmitter and finally our resonant receiver on a Qi transmitter.

Resonant Receivers operating on Resonant Transmitter

The first use case allows customers to test with multiple resonant receivers on our resonant transmitter.  Built-in intelligence means the resonant transmitter automatically detects when the receiver has been placed on the pad, powering only those coils which lie directly under the device.

The system is able to deliver up to 7.5Watts of power to each receiver – highlighting the ability to charge larger devices such as phablets and tablets. Core technology features including Multi-device charging and full spatial freedom enable multiple receivers to be charged simultaneously in any location on the transmitter.

Qi Receiver operating on Resonant Transmitter

The second configuration allows for testing of Qi receivers on our dual mode resonant transmitter.  Any current Qi phone on the market can be charged but with added functionality of full spatial freedom for placement anywhere on the charging surface.

The transmitter is able to detect the type of receiver and delivers the required power to the device – up to 5W for current Qi devices.

Resonant Receivers operating on Qi Transmitters

The third configuration enables backward compatibility with current Qi transmitters.  Our dual mode resonant receivers detect the type of transmitter and switch to operate in Qi mode

In such instances, the resonant receiver detects the Qi pad and switches to Qi mode – drawing between 3.5 – 5 watts of power depending on the Qi transmitter.

For each configuration, users are able to monitor and measure the performance of the system, including individual coil status on the transmitter and overall current and voltage characteristics in each mode.

For more information on the development kit and to receive updates on further advancements, please visit the Proxi-2D EVK page.

Proxi-2D EVK Development Kit Contents

September 9, 2014 / 0 Comments / 60 / Consumer Electronics Solutions
Kit box1

On the back of the recent release of our resonant Proxi-2D EVK Development Kit, this video looks to provide a bit more insight into the technology behind the transmitter and receiver.

The EVK Development Kit includes ten key components packaged in two layers.  Aside from the transmitter and receiver units, the kit includes, two 2mm spacers, a Power supply for the Tx, USB to Serial cable, Adaptor board, Ribbon cable, Mini USB cable and IEC power cord.

 

Setting up the Transmitter:

Setting up the transmitter for use is as simple as connecting the provided power cable.

The Tx consists of a single controller circuit board and coil array.  At the front there are three LED indicators that designate different operating states.  The center red LED indicates when power is being supplied to the transmitter.  The Blue LEDs on the either side will indicate if the when the board is scanning for devices and when charging is occurring.

At initial start up, the transmitter will perform an initial Board scan to detect any receivers that are on the surface of the pad.  Once powered, the board will continuously perform a loop detection to check if an object has been placed on, or removed from the transmitter pad.  A board scan is performed whenever the loop detection detects a receiver being placed on the charging surface. This scan is highlighted by both blue LEDs flashing for three seconds.  During this process a Digital ping is performed on each coil in the Transmitter array to check whether there is a receiver present.

Depending on where a receiver is placed, an LED will stop flashing and remain on – indicating that power is being transferred to a receiver.  The transmitter will enter Resonant mode if a Proxi-2D receiver is detected, otherwise it will enter Inductive or Qi mode if a Qi version 1.1 receiver is detected.

Resonant Receiver module:

The Receiver module itself consists of an Rx coil and circuit board placed inside a plastic sleeve or enclosure.  A series of five labeled LED indicators on the circuit board designate the amount of power being transferred to the receiver as well as the mode of operation.  In this instance the receiver is operating in Resonant mode and is receiving 5Watts of power from the transmitter.

The Rx receives a signal from the Proxi-2D Tx which will inform it to switch to Resonant mode, otherwise it will assume that it has been placed on a Qi Transmitter and will operate in Inductive or Qi mode.

Extended Z Height Testing:

Included within the kit are two 2mm clear spacers. These spacers enable for users to test the system at three different Z heights or coil to coil distances – 3mm, 5mm and 7mm.  The different spacing is achieved by simply inserting spacers between the Rx and Tx boards.  The system will perform in the exact same manner at the different heights.

In our next video we will explain how to set up the system for testing and highlight the functionality of our unique control application software.

Proxi-2D EVK-1 Evaluation Kit now available

August 13, 2014 / 0 Comments / 64 / Consumer Electronics Solutions, Features
2D EVK-1.3

PowerbyProxi is delighted to announce the availability of our latest evaluation kit for consumer electronic devices – The Proxi-2D EvK-1

This kit represents the next step in wireless charging with dual mode functionality for both resonant and Qi technologies. Users will be able to experience resonant charging that is compatible to the existing Qi 1.1 standard, currently available on the market.

The Proxi-2D represents a critical next step in the advancement of the Qi specification and shows consumers the possibility of an integrated, resonant system that is backwards compatible with existing Qi devices.

This release reflects overwhelming demand from our customers and partners to accelerate technology development for greater flexibility and convenience for wireless power and charging, including extending the existing Qi standard.

The Proxi-2D includes a single transmitter and two receivers.  Both the transmitter and receiver can operate in resonant and Qi mode, and are interchangeable with Qi devices.

Included in the kit are spacers to showcase z height testing of the devices at 3, 5 and 7mm, as well as software to enable real time testing and monitoring of both the transmitter and receiver.

Dual mode functionality enables three configurations – testing of Resonant receivers on our resonant transmitter, Qi receivers on our resonant transmitter and finally our resonant receiver on a Qi transmitter.

Resonant Receivers operating on Resonant Transmitter2D EVK-1.2

The first use case allows customers to test with multiple resonant receivers on our resonant transmitter.  Built-in intelligence means the resonant transmitter automatically detects when the receiver has been placed on the pad, powering only those coils which lie directly under the device.

The system is able to deliver up to 7.5Watts of power to each receiver – highlighting the ability to charge larger devices such as phablets and tablets. Core technology features including Multi-device charging and full spatial freedom enable multiple receivers to be charged simultaneously in any location on the transmitter.

Qi Receiver operating on Resonant TransmitterEVK-1 with Qi phone 1

The second configuration allows for testing of Qi receivers on our dual mode resonant transmitter.  Any current Qi phone on the market can be charged but with added functionality of full spatial freedom for placement anywhere on the charging surface.

The transmitter is able to detect the type of receiver and delivers the required power to the device – up to 5W for current Qi devices.

Resonant Receivers operating on Qi Transmitters2D EVK-1.4

The third configuration enables backward compatibility with current Qi transmitters.  Our dual mode resonant receivers detect the type of transmitter and switch to operate in Qi mode

In such instances, the resonant receiver detects the Qi pad and switches to Qi mode – drawing between 3.5 – 5 watts of power depending on the Qi transmitter.

For each configuration, users are able to monitor and measure the performance of the system, including individual coil status on the transmitter and overall current and voltage characteristics in each mode.

For more information on the evaluation kit and to receive updates on further advancements, please visit the Proxi-2D EVK-1 page: http://powerbyproxi.com/evaluation-kits/proxi-2d-evk-1/

Unplugging the last cable with Wireless Power

August 5, 2014 / 0 Comments / 32 / Features
Unplug world

PowerbyProxi presents a vision of how wireless power can be integrated into the home and office to enable greater convenience for the charging of devices and managing power within these environments.  We further consider its impact on transport infrastructure and what a unified standard means for overseas travel.

Transcript for the video is included below:

PowerbyProxi offers a glimpse into the not-so-distant future to consider a world where wireless power is part of everyday life – a world where the last cable has been unplugged.  Some of the most noticeable changes start in the home.  Unrestricted by the power cable, embedded transmitters and integrated receivers safely charge or power electronic devices and appliances across a range of surfaces.  Everything from televisions to lights, to kitchen appliances can be moved and repositioned at will while continuing to be powered.

Miniaturization of receivers to enable convenient wireless recharging will breed further advances in the development of handheld devices and wearable technologies.  More significantly, users will be able to directly manage how power is distributed.  Consider, for instance, the ability to remotely monitor and coordinate the charging of numerous devices.  Not only will power become more flexible and accessible than ever before, but consumers will be able to exercise greater control over how it is used.

The same benefits will translate into the office, where integrated wireless power and wireless data solutions, will boost operational efficiency.  Aside from the reduction in cable clutter, integrated transmitters provide for convenient reconfiguration of workspaces and greater interconnectedness between devices.  Combined wireless power and data transfer supports a more efficient and effective environment for the sharing of information while adding a new dimension to viewing and interpreting data.

Vehicle transportation will also become safer with wireless harnesses removing the need for complex wiring looms, and providing more reliable routing of power to key areas.   Various surfaces within the car can be converted into wireless transmitters for the charging of a range of electronic devices.  The same principle is applied to transport infrastructure on a grand scale. Transmitter pads and docks, integrated into roadways, intersections and carparks, provide an economical and environmentally optimal means to support the refuelling and recharging of the vehicle.  And as in the home, charging can be managed remotely to optimize the amount and timing of power transfer, minimizing costs.

Even when flying, wireless power ensures a safer and less stressful journey.  From the moment you step on the plane devices will be able to be charged from the relative comfort of your seat.  When overseas, a unified standard for wireless charging across means that all essential electronics can be re-charged conveniently, without the pain of carrying, borrowing or buying cables and connectors.

As a leader in the innovation of resonant wireless power solutions across multiple environments, PowerbyProxi is looking forward to help reduce our reliance on the power cable and deliver accessible, pervasive wireless power to the world.

The PowerbyProxi Challenge – IPT car race at The University of Auckland

June 12, 2014 / 0 Comments / 21 / Features
Cars

Every year The University of Auckland Power Electronics department holds an IPT car race which is a part of their final year design project.  In 2014 PowerbyProxi had the privilege of sponsoring the event (called the PowerbyProxi challenge), which involves students designing an inductive power system to deliver power to a radio controlled car that is raced on a circular track.

The event which was held on June 6th, required students to design a pick-up coil, pick-up controller, and an output power regulator which will efficiently deliver power from a transmitting racetrack to an RC car. The challenge of the course is to pick-up maximum power from the track and also convert it in such a way as to provide optimum acceleration to the DC motor which drives the car.

After a semester of learning and many hours spent in the labs, the students were finally given the chance to test their designs in the first round of qualifying: a drag race. Every pair of students was allowed to place their circuit into an RC car, and compete for time along a single track of approximately 10 meters. The drag race is a pure test of speed, and measures the performance of the design. The 8 teams with the fastest qualifying times are invited to compete in the finals, with a $300 prize at stake.

In contrast to the drag race, the finals are set on an ovular track which tests not only circuit performance but also driver handling. The track was set up in the foyer of the ECE department and many students and faculty gathered to watch the annual competition. The sponsor PowerbyProxi had a healthy representation at the event, as 12 engineers (mostly UoA alumni) from the company travelled to the university to support the students.

Students competed 1v1 in the best of 3 races. Round after round, students were eliminated as those with superior driving and circuit performance made their way to the later round. A dramatic final eventually provided a winner, who was congratulated with rapturous applause from the more the 50 strong crowd. PowerbyProxi engineering manager, Kunal Bhargava, presented a trophy and the prize money to the deserving students.

But the drama wasn’t over! As a final test of their design, the students were given the opportunity to race against the faculty designed vehicle. The staff car was driven by Arunim Kumar from PowerbyProxi. The University of Auckland alumni gave the rookie engineers a clinic as he won 3 straight races against the newly crowned champions.

At the end of the day, the PowerbyProxi challenge provided the Power Electronics students with a fun way to test the designs and round out the semester. PowerbyProxi is grateful for the opportunity to support the up and coming IPT engineers in this challenging and exciting course, and the company looks forward to its continued involvement in future years.

Zach Harris

Assembly

IMG_6143FinalistsWinners-2

The Future of Wireless Power with PowerbyProxi

February 7, 2014 / 0 Comments / 26 / Consumer Electronics Solutions, Features
pbp-vid

PowerbyProxi designs the world’s most advanced and safest wireless charging technology for consumer electronics and industrial applications.  In this video we show our vision for the future of wireless charging in the home, and highlight how wireless power can provide greater convenience for consumers.

Click here to learn more about wireless power and our wireless power technologies.

Qi Compatible Wireless Charging Demonstrated

June 1, 2013 / 1 Comments / 29 / Features
vid-2

In this video we demonstrate the first step towards true interoperability for wireless charging. We have developed a Qi compatible wireless receiver which can be charged on a number of Qi transmitters as well as our Proxi Charging Pad which offers full spatial freedom and the ability to charge multiple devices simultaneously. Notice how devices can be arranged in their own form factors on the charging pad in this demo where one transmitter charges up to three smartphones at the same time. These devices can be charged as fast as they can be charged on a wired charger. A huge step forward for the wireless charging industry.

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