Comments on: Wireless Power

By: dave

dave — Wed, 02 May 2007 04:52:18 +0000

Jim,

You are right. But note that they don’t say the antenna is dime sized. They say their receiver circuit (which is basically just a hyperefficient RF to DC converter) is a dime sized. The antenna size would be proportional to the wavelength.

I calculate 1.5mW at 1meter range with 1W transfer. So, if they are 50-70% efficient, that means 1mW at a meter (which is what they quoted). It also means if I stick a transmitter in a drawer with all my “stuff to be charged”, it’ll be charged overnight. The math works…and it does indeed sound like a game changer.

By: Jim

Jim — Wed, 04 Apr 2007 21:17:02 +0000

Before everybody gets all starry-eyed, there are some serious questions that have to be asked:
1) Radio waves travel outward with spherical wavefronts, unless a directional antenna is used. At 30cm away, a dime sized antenna cannot receive more than 1/10 of 1% of the radiated power from this spherical wave.
2) If this is used for a 10-watt (delivered at the device) charger, you could imagine how much power would have to be transmitted – way more than 10 watts. This is in the 900MHz ISM band? How many cordless phones is it going to jam? How badly will it desense cellular phones in the 850MHz band?

I hope the investors asked these same questions…I’m not ready to sign up yet. Magnetic induction is well known and understood, but this has too much smoke and too many mirrors for me…

By: Jason McMains

Jason McMains — Mon, 02 Apr 2007 15:56:18 +0000

This technology is very real. I was actually in contact with the company for a few months for a mechanical engineering project. Sadly, they are only taking huge orders (>100k) for now.

By: Around the web | alexking.org

Around the web | alexking.org — Sun, 01 Apr 2007 07:37:05 +0000

[...] Wireless Power ~ Chris Pirillo [...]

By: Greg

Greg — Sun, 01 Apr 2007 05:14:24 +0000

I’ve heard of this before too, only it was one of those things where the amount of power generated was too small to be meaningful for most applications. It uses a principle called induction.

Magnetic induction is widely used for power generation and transmission. Those 15 power bricks under your desk all use induction to modify power levels going to your devices.

Apparently, RF induction is not unknown, but the company that developed this figured out a way to get meaningful levels from it, plus regulate the current. It’s not impossible.

BTW, they changed the date on the article to 3/30.

By: lexia

lexia — Sat, 31 Mar 2007 02:40:46 +0000

Chris, this has be an early April Fool joke. Look at the date – April 1st! :) Anyways, not sure it’s possible. If it were real look at how dangerous it would be. Rogue radio frying hillwalkers and stray cats.

By: Jerry

Jerry — Sat, 31 Mar 2007 01:18:14 +0000

Hmmm… turns radio waves into power.

So why does it use a special “$5 receiver”?
Why not just suck power out of all the megawatt AM radio broadcasts
going on all around us all the time????

If they start asking for investment money, DUCK and hide your checkbook…

;-)

By: No More Cell Chargers « the j. botter weblog

No More Cell Chargers « the j. botter weblog — Sat, 31 Mar 2007 01:10:10 +0000

[...] Mar 30th, 2007 by J. Botter This is pretty fantastic — a Pennsylvania company called Powercast has created a method for turning radio waves into electricity. Chris Pirillo says it’s a game-changer, and I completely agree. I can’t imagine being able to simply sit down at my desk and have my cell phone charge, still in my pocket, without having to plug anything into the wall. [...]

By: Victor Agreda Jr

Victor Agreda Jr — Sat, 31 Mar 2007 00:46:08 +0000

This sounds a LOT like what Tesla proposed many, many years ago. Except his plan was to provide power to the entire world– for free. (No, I’m not talking about AC, although he did “create” that)

By: Jim Edelen

Jim Edelen — Sat, 31 Mar 2007 00:42:53 +0000

Business 2.0 has that article in the print magazine as well on the web so it seems unlikely it is an AFD joke.

By: James

James — Sat, 31 Mar 2007 00:16:57 +0000

I’ve heard about wireless power I think 2 or 3 months ago on some podcast…but the timing of this seems suspcious.

By: Julian Seery Gude

Julian Seery Gude — Fri, 30 Mar 2007 23:30:43 +0000

I heard about this on a TWIT podcast around CES time and I was simply blown away by the technology. It’s hard to believe that it is even real!

p.s. Just added you recently on Twitter – I enjoy your tweets! Jinfinite8. My better half is seerysm – also on your list.

Cheers Mate!

By: The Chris Pirillo Show

The Chris Pirillo Show — Wed, 30 Nov -0001 00:00:00 +0000

Personal Blog Wireless Power How not to use a Gun I?m in a JibJab Cartoon!!! Pirillo?s Picks for 03/27/2007 OpenOffice vs. Microsoft Office TENSION BREAKER! I had Death Threats in High School Please, port Beryl to Windows or OS X?

By: louisgray.com: live: Silicon Valley Blog

louisgray.com: live: Silicon Valley Blog — Wed, 30 Nov -0001 00:00:00 +0000

potential for wireless power to become a reality. A company called Powercast has developed a way to power low-voltage devices wirelessly, and Philips will be bringing it to market, according to Mathew Ingram.. Chris Pirillo is similarly excited, saying "Finally, a piece of technology that nobody will be able to live without." Powercast has a major write-up in the upcoming April issue of Business 2.0, which any good geek should be subscribed to, BTW. Business 2.0 says the technology isn't any more sophisticated than AM or FM radio, as it converts radio waves into DC

By: SocioBiblog

SocioBiblog — Wed, 30 Nov -0001 00:00:00 +0000

the July 2007 issue of Popular Science magazine (trying to ignore the gross oversight that a contributor made by claiming that Yahoo Pipes was easy)... Related Content:The FCC Song!My Dad The Senator!USB Charger for AirplanesPluggd Keeps Us Plugged InWireless PowerYou Drink Too Much Coffee WhenNext To GodlinessPolitical CartoonsPedometer WalkingLetter from a Disgruntled TechTV/G4 Viewer