New Wireless Power Chip for Qi Charging Stations
New TI Second-generation WPC 1.1-compliant power controller requires one-third fewer components
TI has realeased its next-generation wireless power transfer circuit to support the Wireless Power Consortium (WPC) 1.1 specification.
The bq500212A transmitter, which is shipping in volume production, requires one-third fewer components than competitive solutions.
The circuit allows designers to quickly take to market Qi-compliant wireless charge pads or stations that can operate from a USB port or 5-V power adapter.
With more Qi charging stations available in the marketplace, consumers of Qi-enabled smartphones, smartwatches and many other "enclosed" portable consumer electronics will be able to keep their batteries charged longer. Products like the Kickstarter-born AGENT Smartwatch are using TI's bqTESLA™ wireless power products, including the bq500212A and a bq51050B receiver, to ensure wireless power capability.
“AGENT Smartwatches need to be water resistant, and consumers shouldn't need to worry about plugging their watches into a charging adapter day after day,” said Chris Walker, founder of Secret Labs. “TI's wireless power products give our customers the ability to simply set their AGENT Smartwatch on the included Qi charging pad (or any other Qi-compliant charging pad) from time to time to keep the battery topped off. No wires, no hassle.”
Features of the HD3SS2521 include:
- Complete WPC 1.1 Qi-compliant design: bq500212A needs only five components, including two new CSD97376 Power Stage integrated circuits; while other products may require up to 15 devices.
- Intelligent power control: TI's Dynamic Power Limit™ technology enables the transmitter to work from either a USB port or low-power adapter. The device's standby mode ensures <100 mW of standby power with no receiver on the pad and <50 mW once the receiver has finished charging.
- Hybrid capacitor scheme significantly reduces system bill of materials cost by using a combination of X7R and COG capacitors instead of only relying on COG capacitors.
- Foreign Object Detection, as mandated by the WPC1.1 specification, comes standard on the bq500212A, which features an improved algorithm with greater accuracy of error sensing.
The company's Web site address is www.ti.com
[Reprinted with kind permission from Texas Instruments]