The Qi Wi-fi 5W Charging Transmitter design gives a 70% effectivity ranking and is appropriate with any cellphone charger able to delivering a minimal present of 2A.
Qi charging, endorsed by the Wi-fi Energy Consortium (WPC), is the prevailing customary for wi-fi energy switch. Often used handheld gadgets, like smartphones, typically face early connector and mechanical failures on account of frequent cable plugging. Wi-fi charging gives tangible consolation advantages, permitting telephones to be left on charging pads for prolonged intervals and used conveniently at any time. Microchip has launched a Qi Wi-fi 5W Charging Transmitter Primary Energy Profile (BPP) Reference Design to simplify the design course of. The reference design features a transmitter and two varieties of receivers (linear and switching). The system boasts an total effectivity exceeding 70% and gives full Li-Ion charging algorithm assist. It may be simply custom-made to accommodate varied chemistries. The design is powered by a 5V provide from a USB-C connector, permitting it to be simply appropriate with any cellphone charger able to delivering a minimal present of 2A.
The transmitter circuit is made up of a minimal element rely, consisting of a PIC16F microcontroller, two MOSFET drivers, and three operational amplifiers. The firmware on an 8-bit microcontroller implements the Qi protocol, particular state machines, and management loops. The wi-fi charging transmitter operates inside a 5W energy restrict, reaching a switch effectivity of 70% or larger. The design incorporates efficiency-based Overseas Object Detection (FOD) mechanisms to forestall unintended charging and guarantee protected operation. The efficiency-based FOD set off threshold scales proportionally with the transmitter energy. The working frequency ranges from 110kHz to 205kHz. The transmitter design incorporates voltage and present protections for the resonant tank, safeguarding the parts throughout operation.Â
The reference design includes a person interface linked by way of a common asynchronous receiver transmitter (UART), permitting seamless communication. The interface shows essential parameters corresponding to voltage, present, switch effectivity, transmitter/receiver energy ranges, and error flags, offering customers with real-time data. Moreover, it permits parameter monitoring and gives graphical representations of the info for enhanced visualization. The design additionally permits for configurable receiver detection and safety set off thresholds, empowering customers to customise the settings in keeping with their wants. Moreover, the FOD set off thresholds might be adjusted to swimsuit particular person preferences, offering flexibility in managing international object detection.
This reference design has been examined by Microchip. It comes with a Invoice of Materials (BOM), schematics, Printed circuit board (PCB) structure, and so forth. Yow will discover further knowledge concerning the reference design on the corporate’s web site. To learn extra about this reference design, click on right here.
