Article

Smart Wireless Power

It's a fascinating technology with applications that are likely limited only by our imaginations.

August 2008, TruckingInfo.com - Editorial

by Steve Sturgess, Executive Editor

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When the transistor was invented in Bell Labs in 1947, its creators could have had no inkling of the uses it would create. Similarly, a small group in Ada, Mich., is casting around for applications for new technology: smart electrical power over an air gap.

Power over an air gap is the ability to transmit electrical power without a physical hard-wired connection.

Yes, you say, I know about that. My electric toothbrush charges in its cradle; those European kettles boil water when placed over their bases.

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And to an extent, that's right. Except those applications are not "smart."

A new company, Fulton Innovation, has developed a technology that uses similar inductive coupling to get power from a primary winding to a second, but it is accompanied by electronics that recognize what that secondary is: its voltage, the power required, even the way the power is conditioned to best be used by the secondary.

A great illustration of the application of this technology was shown at the National Truck Equipment Association's Work Truck Show, where it garnered the award for the most innovative new product. The shelving and accessories of a Leggett & Platt converted utility van were configured so that 36-volt power tools automatically recharged simply by placing them on a work surface.

It works like this: The van has a counter with a decal indicating where to rest the Bosch tool, putting the battery in close proximity to the coil embedded in the table. This and the associated electronics query the battery in the tool, discovering it is a 36-volt rechargeable. A light at the edge of the table illuminates to indicate the battery is charging. Moreover, the battery has been queried to see if it is relatively new, or if it has been deep cycled thousands of times. It then gets the optimum charge cycle.

When work at the site is complete, the tools - say a drill and a reciprocating saw - are put back into the compartments in their carry case, and it is put into its bin on the vehicle's racking. The case has an enabled liner that talks to the tools, the liner talks to the van through the shelf and the tools recharge on the way back to the depot. There are no power bricks, no inverters. The whole thing just runs off the van's 12-volt system.

Outside, the van has a flip-down work surface with a recharge spot. Working with the tools, the operator simply needs to rest them back on the spot for batteries to be kept up to charge.

Want a sign that says "Danger?" Just hang it over the power point installed at the rear of the vehicle and it gets its power wirelessly.

You can do the same in the vehicle's center console. Throw your cell phone, Blackberry and iPod into one of the available mini-bins and the system recognizes them for a recharge. Three-volt battery-powered flashlight? Just chuck it in. The system will find its resonance and hook it up to charge. You could have an embedded primary in the windshield where you attach the navigation system. Clamp it to the glass and it is automatically powered.

Pretty cool. Now think about that flip-down table in the sleeper of a long and tall. A power spot there means a driver can pull out the 110-volt coffee pot, set it down appropriately filled with water and ground coffee, and in moments there's fresh-brewed coffee. Or place the laptop there. The system sees a 15-volt battery and hooks it up. Imagine a truck cab free of recharger bricks for each portable electronic aid. And also imagine drivers not plugging too big an inverter into a cigar lighter outlet and frying the electrical system or burning down the truck. Definitely a good thing.

And how about electrical connections that are subject to corrosion, such as the J560 cord between tractor and trailer? All those connections can be made through non-contact power connections using this technology.

Maybe you don't need IdleAire or plug-in shore power. All you need is a pigtail that suction-mounts to the appropriate panel on the outside of the truck. You could just pull up to a wheel chock to locate the truck and you're hooked to an in-ground power primary. You still need some electrical infrastructure at the truckstop or terminal, but you have no conductor-connection with its associated dangers in wet weather. Conceivably, you could hook up an electrical standby to a reefer in exactly the same way, since according to the Fulton scientists, the power-over-air-gap is entirely scalable.

It's a fascinating technology with applications that are likely limited only by our imaginations.

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