PowerbyProxi > wireless power

Unplugging the last cable with Wireless Power

August 5, 2014 / 0 Comments / 228 / Features

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.

Frequency selection in wireless charging – what’s efficient and safe?

July 31, 2012 / 0 Comments / 1339 / Technical

When we talk about wireless power, one of the first design questions we consider is… “at what resonant frequency should the system transfer its power?”.  Selecting the system’s resonant frequency helps increase the distance for power transfer and improves the efficiency of the wireless power solution. But what are the health implications? and are wireless charging products being accurately measured?

Resonant frequency refers to the frequency at which an object naturally vibrates or oscillates.  It is at this frequency that objects are able to achieve their maximum amplitude – whereas it is difficult to get them to vibrate at other frequencies.  In the case of inductive power transfer (IPT), the principle of resonance is applied to induce an electrical current between coils of the same frequency over greater distances.

Naturally the resonant frequency will depend on the problem or application, however there are other factors which influence this decision.  As with all electronic products, the foremost issue is safety.

Usually safety is determined by how much radio frequency (RF) exposure can be applied without being harmful to human health.  Guidleines do exist which provide reference to what are acceptable and safe limits of exposure…or so we think.

Most would consider the 1998 and the 2009 ICNIRP (International Council on Non-Ionizing Radiation Protection) guidelines as a reference to those limits. Yet the guidelines lack any specific mention or reference to the behaviour of wireless power systems.  What this means is that the “limits” identfied may not accurately apply to RF radiation created by wireless charging.

That is not to say that wirelss power systems operating under these guidleines are unsafe –  electromagnetic fields created by this technology are considered to be at the lower end of the exposure spectrum. But surely more specific and conclusive measurements of IPT applications are required to understand the appropriate exposure limits?

Otherwise how do we know if limits are too harsh? (impacting the quality of solutions), or  conversely, not harsh enough?

Fady Mishriki is Co-Founder, EVP and Chief Tesla Officer at PowerbyProxi