User Guide
8 of 25
002-35126 Rev. **
2022-05-10
WLC1115 MP-A11 15-W wireless power transmitter
(REF_WLC_TX15W_C1) user guide
WLC1115 wireless power transmitter system design
3.1
REF_WLC_TX15W_C1 MP A11 15W power transmitter board
The
REF_WLC_TX15W_C1
MP A11 15-W transmitter board implements the power stage and control of wireless
power transfer system. The transmitter board architecture is shown in
Figure 4
REF_WLC_TX15W_C1
power transmitter reference board architecture
The following are key features of the reference board:
1.
Qi 1.3.2 compliance
2.
Robust ASK and FSK in-band communication between transmitter and receiver
3.
Integrated foreign object detection based on system parameters like Q-factor and power loss
4.
Type-C PD Input with PD compliance
5.
Wide input voltage ranges from 4.5 V to 24 V
6.
Integrated buck converter gate drive and control, operating at a switching frequency of 400 kHz
7.
Integrated gate drive for full-bridge inverter operating at 127.7 kHz switching frequency
8.
MP-A11 coil with variable Inverter input voltage control
9.
Peak efficiency of greater than 83% at full load with WRM483265-10F5-12V-G
The reference board contains the following key sections:
1.
Input connector
–
The board can be powered using a USB-C power adapter over the USB Type-C connector
(J3). There is also an option for a DC power supply connection (J6). See
to understand the
procedure for powering the reference board using a DC supply. Contact Infineon
enable the operation of the reference board using QC/AFC adaptor
2.
Buck stage
–
The buck power stage regulates VBRG voltage to control the power to the receiver. The buck
stage operates at a 400-kHz frequency in forced continuous conduction mode (FCCM). The VBRG is
regulated from 3-V to 18-V based on receiver type and load. Based on the VBRG value, the USB PD contract
(PVIN_0) dynamically varies between 9-V, 15-V, and 20-V during power delivery to optimize efficiency. When
there is no receiver on the interface surface, the USB PD contract is set to 5-V
