The compact 15 Watt wi-fi charging receiver design adheres to the Wi-fi Energy Consortium (WPC) specs and affords space-efficient integration. 

Wi-fi charging allows handy and cable-free energy switch to gadgets. It makes use of electromagnetic fields to switch power between a charging pad and a suitable machine, eliminating the necessity for bodily connections. This expertise is more and more built-in into smartphones, smartwatches, and different moveable gadgets, simplifying the charging course of for customers. To simplify the design course of, the NXP has launched the reference design for 15 Watt Buck Wi-fi Charging Receiver that helps bigger kind elements like the most recent smartphones and tablets, catering to their want for quicker charging. The design complies with the Wi-fi Energy Consortium (WPC) and Medium Energy Working Group (MPWG) specs and may help forthcoming requirements.

The receiver coil of the design receives enter energy starting from 3.5 V to twenty V AC at its peak from the transmitter. It effectively converts this enter into an output energy of 15 W, offering 5 V at 3 A. The design additionally helps Frequency-shift keying (FSK) communication alerts from medium energy transmitters. To make sure the security and integrity of the system, the design incorporates {hardware} safety mechanisms for rectifier voltage, output voltage, and output present. It affords space-efficient integration with a compact Printed Circuit Board (PCB) dimension of 40 mm × 40 mm. 

The reference design is predicated on the ARM Cortex M0+ processor with Ultrahigh Voltage (UHV) expertise. The rectifier on this design makes use of a self-driven sync kind and has an enter voltage vary from 3.5 V to twenty V AC at its peak, whereas the output voltage vary from 3.5 V to twenty V DC. When it comes to communication, the design incorporates Amplitude-shift keying (ASK) differential bi-phase sign modulation by switching the modulation capacitor. The FSK sign can also be demodulated utilizing the Computerised Numerical Management (CNC) and FSK demodulation timer (FSKDT) modules. For enhanced versatility, the CNC module detects enter voltage from wired energy plugs and robotically switches to wired energy when the voltage falls throughout the 4.5 V to five.5 V vary. Furthermore, the design contains a DC-DC converter that accepts enter voltage starting from 5 V to 21 V DC, offering an output of 5 V DC with a present capability of three A.

The design affords flexibility to accommodate numerous output voltages, catering to totally different utility charging voltage necessities. The reference design incorporates interfaces reminiscent of a 12-bit analog-to-digital converter (ADC) and Programmable Acquire Amplifier (PGA) for environment friendly energy loss detection on the system degree, making certain Overseas Object Detection (FOD). The Inter-Built-in Circuit (I2C) and common asynchronous receiver transmitter (UART) interfaces permit for safe communication between the receiver and the primary utility processor (AP), facilitating safety measures or content material supply.

NXP has examined this reference design. It comes with a Invoice of Materials (BOM), schematics, and many others. Yow will discover extra knowledge in regards to the reference design on the corporate’s web site. To learn extra about this reference design, click on right here.