Wireless battery charging chipset shrinks sealed wearables Andy Pratt September 30, 2016 Comms / Bluetooth / Wireless, Power To save space and simplify enclosure design and sealing, STMicroelectronics has introduced a miniature, wireless battery-charging chipset. The combination of the STWBC-WA charging-transmitter controller and STWLC04 wireless battery-charger receiver enables power transfers up to 1W with the smallest coils available: 11mm diameter coils on the receive side and 20mm for the transmitter. Power-transfer capability can be increased to 3W by using larger coils and a full-bridge circuit on the transmitter side, notes the company. Additionally, without the need for a conventional charging connector, enclosure design is simplified, with sealing to prevent contamination by dirt or moisture. The chipset supports wireless-charging for Li-Ion or Li-polymer battery chemistries and includes safety mechanisms such as foreign-object detection, active transmitter-presence detection, and receiver thermal protection. The transmitter chip has integrated drivers, native support for half-bridge and full-bridge topologies, and a configurable firmware option for a turnkey or customised application. The receiver supports direct battery charging, which allows smaller circuit-board size, and features a 32bit microcontroller core, an efficient buck converter with synchronous rectification, and integrated drivers. The company offers the STEVAL-ISB038V1 evaluation kit, which includes transmitter and receiver boards, as well as a GUI that enables engineers to monitor system behaviour and fine-tune parameters. The STWBC-WA transmitter controller is packaged as a VFQFPN32 and the STWLC04 receiver is in a 77-bump 3.12 x 4.73mm flip-chip package. http://www.st.com/wbc WEARTECHDESIGN.COM – Latest News/Advice on Technology for Wearable Devices Weartechdesign is unlike any other website currently serving the technology for wearable devices. We carry the very latest news for design engineers and purchasers. Register on our mailing list to receive regular updates and offers from WearTechDesign REGISTER YOUR INTEREST Leave a Reply Cancel ReplyYou must be logged in to post a comment.