Continuing on from my previous blogs regarding wireless power & charging standards and comparing various stances on the wireless charging of electronic devices – today I want to discuss the respective positions on frequency.
I have written in the past about convenience for Consumers in wirelessly charging mobile devices. Some of the key factors are:
- “loosely coupled” or the ability to “drop and forget” which means you don’t have to work hard in making sure your smartphone is aligned or oriented precisely on the charging pad for it to charge
- Simultaneously charging multiple devices such as a smartphone, a tablet, a remote control, gaming controller,… at the lowest cost
While the Consumer Electronics Association WG4 will deliver on the above, there is an on-going debate to select the right frequency.
Of course the Wireless Power Consortium has defined a specification for frequencies below 500 KHz. Such products have been shipping and proven to be safe and reliable.
At the same time, another working group called the A4WP is driving a specification for a frequency of 6.78 MHz – making it incompatible with products now shipping. In addition, the 6.78 MHz frequency has not yet been proven to meet safety and emission requirements, while is also expected to cost more.
Does it not seem obvious that Consumer Electronics Association WG4 select a frequency less than 500 KHz, which has been proven to meet the safety and emission standards, is the lowest cost for consumers, and is interoperable?
Let me now your thoughts.