The high-power wireless fast charging solution is a 15W Qi-standard wireless charging transmitter design (MP-A11 topology) built around the NXP WCT1013 wireless charging controller. NXP has obtained Qi 1.2.3 certification for this solution from an accredited Qi wireless charging certification body, so it is compatible with all Qi-standard receivers, including BPP 5W receiver devices. The software library is NXP's own certified library, which helps customers pass Qi certification with minimal effort. Comprehensive hardware and software support is available today, including hardware design guidelines and schematic libraries, software libraries and prototype software source code, enabling customers to bring up a wireless charging design quickly and pass Qi certification with ease.
Solution Overview
The functional block diagram of the high-power wireless charging solution is shown below. The main controller is the dedicated DSC-core processor WCT1013. The power inverter transmit stage can be implemented either with a discrete pre-driver plus full-bridge circuit, or with the single integrated PCA9440 (NXP's companion wireless charging driver IC); the discrete approach can in theory deliver higher output power. The protocol communication hardware is extremely simple, relying mainly on software encoding/decoding in the WCT1013 to reduce hardware cost. Voltage and current sensing supports the FOD function, while temperature sensing provides over-temperature protection for the wireless charger.
Recommended MCU
- MWCT10xx series: WCT1013VLH — 32-bit DSC core, low power; 100MHz bus clock frequency; 32KB SRAM / 256kB Flash; 12bit ADC and a range of integrated peripherals; CodeWarrior development environment
Core Components
- MCU: MWCT1013VLH (NXP)
- Drive+MOSFET: NXP, full part number available on request
- DC-DC: MPS, full part number available on request
- Pre-Drive: onsemi/MPS, full part number available on request
- Power MOSFET: Nexperia, full part number available on request
- Current Sense: onsemi, full part number available on request
- Amp: 3Peak, full part number available on request
Key Advantages
- Qi certified
- High output power
- Foreign object detection
- Intelligent protection
- Chinese-language development documentation
- Full technical support
Reference Design WCT15W
- Software library already Qi 1.2 certified
- Supports all Qi-compliant phones currently on the market
- 15W (higher available) fast charging for faster charging output
- Advanced foreign object detection, intelligent shutdown, fast charging without overheating
- Steady red indicator warning when metal or other foreign objects are detected
- Thermal protection, over-voltage and over-current protection, reverse-polarity protection
- Excellent EMC performance
Functional Block Diagram
