Power-over-distance wireless transmitter ships retail and devkit systems

September 27, 2018 // By Nick Flaherty
Powercast has started shipping its 3W, Bluetooth-approved far field transmitter that can charge multiple consumer devices at a distance of up to 25m. 

Powercast's $100 PowerSpot retail package includes the PowerSpot TX91503 RF wireless transmitter, a six-foot power cord, a USB wall outlet adapter, and a quick start guide.

Powercast began production of its transmitter after receiving FCC approval in the US and ISED approval in Canada late last year. The company is also launching a development kit to help manufacturers easily design PowerSpot-based wireless charging ecosystems.


Creating a coverage area similar to Wi-Fi, the PowerSpot transmitter automatically powers or charges PowerSpot-enabled devices when they come within range. The transmitter uses the 915-MHz ISM band to send RF energy over the air to Powerharvester receiver chip embedded in a device, which converts it to direct current (DC) to either directly power or recharge that device’s batteries. The Bluetooth-approved transmitter detects devices within range and automatically begins delivering power.

The PowerSpot transmitter was designed to automatically top off up to 30 PowerSpot-enabled devices left on a countertop overnight in its charging zone, which varies with device type and power consumption. Instructions included with enabled devices will show recommended charging distance and time for that device. For example, power-hungry, heavily used devices like game controllers, smart watches, fitness bands, hearing aids, or headsets charge best up to two feet away; keyboards and mice up to six feet away; smart cards and TV remotes up to 10 feet away; and low-power devices like home automation sensors up to 80 feet away. On the transmitter, an illuminated LED indicates devices are charging and it turns off when they’re done. Audible or visual alerts indicate when devices move in and out of the charge zone.

The Bluetooth-approved PowerSpot features a Bluetooth Low Energy (BLE) multiprotocol solution that makes the transmitter smart, configurable, and controllable. For example, BLE wirelessly schedules power transmissions, monitors battery status of charging devices, turns off the transmitter when devices are fully charged, and communicates data (detected devices and

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