User's Manual

D-WMI2020B_User_Manual_Rev4.docx
Page 3
information, the transmitter creates a power transfer contract containing the maximum
power to be delivered to the load.
1.1.2.2 Charging mode
After “Ping mode”, the power transfer starts. In this operational mode, the transmitter sends
the carrier at a given level defined in the power contract in the operational “Ping mode”. The
WMI controls the power transferred to the smartphone, in response to the control data
messages sent by the smartphone.
1.1.2.3 Transmitter to receiver communications
The WMI transmitter communicates to the mobile device using Frequency Shift Keying, in
which the Transmitter modulates the Operating Frequency of the Power Signal.
1.1.3 WPC parameters
Bellow in table 1, the technical parameters of the WMI WPC feature are specified:
Parameters
Values
Carrier frequency
127.7 kHz
Frequency shift
+/- 6 kHz
Supply voltage
12V battery
Voltage supply range
9V < Vbat < 16V
Product operating temperature range
Smartphone operating temperature range
-40°C < Temp < 85°C
-20°C < Temp < 60°C
WPC chipset brand
IDT
WPC litz coil
Single coil MPA19
according to Qi standard
WPC litz coil gain @ 127.7kHz
-107.1 dBi
Max. output power
15W
Max. current consumption
3.5A (2A typ)
Vehicle fuse protection
7.5A
Product weight
270 g
Dimensions (X/Y/Z in mm)
170/90/33 mm
Table 1: WMI WPC technical parameters.
The rated output power from the WPC coil is Max. 15W transferred to the load. The receiver
manages the wireless charger in order to guarantee stable 15W on the load.