A new wireless power technology delivers power to devices up to 10 feet away. Elsewhere engineers have developed a way to transfer power and data electromagnetically through a Faraday cage. New products include SiC-replacement diodes, high-reliability double-layer capacitors, and a PAR38 spotlight reference design.
The announcement of a new wireless power technology from startup Ossia leads this week's roundup of power-related technology and product news. Unlike the magnetic-induction-based Qi wireless power standard, which requires very close proximity between the charger and device, Ossia's technology -- dubbed Cota -- uses phased arrays of transmitters to deliver power wirelessly to devices at distances of about 10 feet. Cota operates at WiFi frequencies and is said to be able to deliver 1 W of power at a distance of 30 feet safely. See a video of the live demonstration at this week's TechCrunch Disrupt SF.
Engineers at The Technology Partnership (TTP) -- a UK-based technology and product development company -- have figured out a way to bypass the Faraday cage effect, whereby an enclosure formed of a conducting material blocks the entry or escape of electric fields. TTP's new technology, called Fluxor, claims to enable the electromagnetic transfer of power and data through the metal shielding of an enclosure by using a strong DC magnetic field to saturate a small portion of the metal to create a "window" to allow such transmission. According to the company, this opens up many possibilities for wireless sensor applications and the Internet of Things.
TTP is already using its Fluxor technology to monitor fluid levels in steel pipes (as shown), take readings from medical implants, and measure data from inside high-performance Formula 1 engines.
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Recent product announcements include second-generation 600-V tandem diodes from STMicroelectronics that claim to offer an economical alternative to SiC in electric vehicle charging points. The STTH8T06DI and the STTH8ST06DI are rated for 8A average forward current, and the STTH12T06DI is for applications up to 12A.
New electrical double-layer capacitors from Murata offer a long-term reliability of five years at 70° and an ESR of 130 mΩ. The 14 x 21 x 3.5-mm DMT series features a nominal capacitance range of 470 mF and voltage handling to 4.2 V.
Power Integrations, in collaboration with Cree, has developed a reference design for a dimmable PAR38 spotlight. The DER-350 uses Power Integrations’s LYT4317E single-stage driver, along with Cree’s MT-G2 EasyWhite LEDs.
Finally, Allegro MicroSystems has introduced the latest in a family of single-channel low-noise block regulator ICs for satellite TV system applications. Operating at a 704-kHz switching frequency, the A8304 integrates a boost MOSFET, current sensing, and compensation circuitry.