SAN JOSE, Calif. – Qualcomm powered up its plans for wireless charging market, licensing technology to Gill Electronics for an undisclosed sum. The two say they expect to see in 2014 products including cars and office furniture using their implementation of the spec from the Alliance for Wireless Power (A4WP).
The competing Wireless Power Consortium (WPC) was the first to market and claims as many as 8.5 million products have shipped using its Qi technology, some based on chips announced last fall by Texas Instruments. Intel demonstrated its own approach to wireless charging which it said would hit the market later this year.
The A4WP spec adopted by Qualcomm and Gill uses a 6.78 MHz frequency. It avoids the heat generated by the competing WPC technique running several hundred KHz, said Brad Miller, director of advanced development at Gill (Grand Rapids, Mich.). It also uses Bluetooth already embedded in mobile products to create a control channel between the charger and mobile devices.
In addition, the A4WP spec uses smaller antennas than the inductive coils needed for WPC. That allows for greater miniaturization and less potential interference with other wireless signals such as near-field communications, he said.
“I expect we will have products in the market by the end of this year, with mass market adoption taking place in 2014 when other A4WP members start delivering consumer devices with the technology already embedded into the devices,” Miller said in an email exchange.
Those products will include aftermarket accessories to add to car storage bins and armrests. Gill also is pursuing design wins in office furniture.
“We have products that can be embedded up inside work surfaces or simply attached to the bottom of any work surface up to 30mm thick and transmit power through the entire work surface while still maintaining the spatial freedom and flexibility to provide different levels of power to different devices at the same time,” he said.
Qualcomm’s WiPower implementation of A4WP lets users charge multiple devices on a single charging surface at the same time, even if they have different power requirements. It delivers up to 22W and enables charging devices without physical contact to charge area, said a Qualcomm spokesman.
By contrast WPC chips released by TI in November enabled a 70 x 20 mm charging area.
Doesn't make much sense to me, since we are unable to "hold" our phones anyway. It seems the more logical approach is to have a universal dock. Motorola has been trying to do that of late with there various models. Sound, microphone, power, etc. are easily be accommodated with a microusb plug.
I am rooting for solar/light for both power and data. It'd be quite nice to just have PE cells that can capture extremely low level ambient light and PE cells that are fed into filters for the data path and wires are gone and much of the RF along with it.
Light is a wonderful broad-spectrum resource and we are troubled without it. Let's use it better!
I really do not see a bright future with wireless charging when compared with its counterpart, USB charging.
1) It needs additional hardware. Costwise, it will be more expensive.
2) The efficiency is poorer. Not environmental friendly. ( Note that almost every two years, there are tighter energy standards for power adaptors/chargers. The performance of wireless charging is far behind that)
3) The future improvement is limited. Since it operates with primary coupling coil and secondary coupling coil separated, this inherently leads to a lower efficiency and incur a lot of limitations. This is a constraint by physics.
4) Business model is another question. For a comodity USB adapter, one may get it with just a few USD and it can be used for a lot of devices. For wireless charging, one need to pay a higher premium for the transmitter and then, the lower cost on the receiver. The first seller to include the transmitter will add that cost to his own device ( while lowering the cost of the other portable devices ). Who does that? By the way, there are a lot of different standards, when I buy my computer with a transmitter of "A" standard but the phone I use is of "B" standard. Will I pay something extra unnecessarily ( for unused "A" transmitter? Or should I change to use a phone with "A" standard?
Define reasonable efficiency. Note that Qualcomm's standard does not mandate a distance between the Rx and Tx coils. Its "advantage" is that there are no such constraints and the handsets can be positioned "casually" within several 10s of centimeters. WPC does but then you're back to the "mat".
As anyone who has ever designed a transformer (B/H field coupling) or capacitor(E field coupling) knows that fractions of a millimeter in the windings can make a huge difference in the coupling. So yes, if a handheld product can be designed so that the space between charger and pick-up coil or plate is on the order of 0.5mm or less, reasonable efficiency can be obtained.
I waste tons of electricity because of all the chargers I need to keep plugged in, and the inconvenience of unplugging those not in use (or even figuring out which ones they are, with cables all over the place).
Beyond that, one of the purposes of energy is to make things convenient. If you want to live in an inconvenient world, fine by me - but don't make me do the same in the name of some green god.
Nobody seems to mention/talk about the efficiency which happens to be really poor. Very very poor. The real convenience should start with a universal wired charger adopted by all manufacturers so we don't get a new charger every 18 months with our new smartphones. A4WP or WPC, who cares, they all require coils on both sides, additional hardware and cost for a mediocre performance and energy waste for what? Showing off by saying your phone is charging in your pocket while driving? I'll pass.
The magnetic resonance method is interesting. Although the inductive method used by Qi is electrostatic induction, not to be confused with electromagnetic induction, it is really just a modernization of Nikola Tesla's early 20th century work with improved efficiency coming from the use of much higher frequencies.
"wireless charging is just going to waste more electricity for a small trade off in convenience?"
Except that the user won't see it as a *small* increase in convenience.
Like most folks, I have a lot of devices that need to be charged. Every one seems to have a different charger and power connector, and I have a drawer full of chargers with stick on labels so I know what they are intended to charge. I'd love a one-size-fits-all charger that can adapt to what the device wants to see, and devices that can use it.
The "waste" of electricity would be a tiny price to pay.
Competition is not always contrary to standardization. I agree that there may be a reason for non-compliance adding value above a standard (like Atheros did with their 108G).
But, industry designed in to a standard knowing that they would not have to redesign in less than a year in order to work well with the commodity/standards. Early adopters of 108G WiFi knew that it would work with the rest of the world of they just disabled the Atheros extension.
Imagine deciding you want to implement a product but, you are waiting for some standards before you do so. Imagine every vendors pedantic suborn decision that everyone must comply withe their implementation. Now imagine we wait another 3 years for these vendors to be winnowed down creating a defacto standard before we decide to use the feature. Welcome to competition...
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