Table 7 Protection mechanisms
Protection
Default limits
Variables
Description
Rail voltage
23000 mV
gPROT_Params.wMaxRailVol
Application implemented. If the rail voltage
exceeds the limit, charging is turned off. The
limit value can be changed in PROT_Init().
Battery voltage
Min: 8000 mV
Max: 18000
mV
Hysteresis:
1000 mV
gPROT_Params.wMinBatteryVol
gPROT_Params.wMaxBatteryVol
gPROT_Params.wBatteryHystVol
Application implemented. If the battery
voltage exceeds the maximum, the WCT
library stops. When the battery voltage is
lower than the difference between maximum
and hysteresis, WCT library starts. When the
battery voltage is lower than the minimum,
the WCT library stops. When the battery
voltage is higher than the sum of the
minimum and hysteresis, the WCT library
starts.
The limit value can be changed in
PROT_Init().
Input current
4000 mA
gPROT_Params.wMaxInputCurrent
Application implemented. If the input current
exceeds the limit, charging is turned off. The
limit value can be changed in PROT_Init().
Coil current
5000 mA
gPROT_Params.wMaxCoilCurrent
Application implemented. If the coil current
exceeds the limit, charging is turned off. The
limit value can be changed in PROT_Init().
Input power
Non power
transfer: 3000
mW
Power transfer:
240%
gPROT_Params.wMaxInputPowerDuri
ngNonXfer
gPROT_Params.wMaxInputPowerMult
iPercent
Application implemented. When the TX is in
the PING phase, the maximum limit is 3000
mW by default. When the TX is in online
calibration (EPP RX), power transfer or
renegotiation phase, the maximum limit is
240% of the RX maximum power. For BPP
RX, the maximum is 12 W. For EPP, the
maximum is 36 W. The limit value can be
changed in PROT_Init().
Temperature
Max: 60
℃
Hysteresis:
10
℃
gPROT_Params.swTemperatureThres
hold
gPROT_Params.wTemperatureHyst
Application implemented. If the temperature
exceeds the maximum, the WCT library
stops. When the temperature is lower than
the difference between the maximum and
hysteresis, the WCT library starts. The limit
value can be changed in PROT_Init().
Safe digital ping
200 mA
gPROT_Params.wSafeDigitalPingInpu
tCurrentThreshold
Library implemented. If the input current
sampled at the beginning of the digital ping
exceeds the limit, digital ping stops. The limit
value can be changed in PROT_Init().
FOD
BPP RX: 600
mW
EPP RX:
1000 mW
lFodParams.dwPowerLossLimit
Library implemented. If the power loss
exceeds the limit, charging is turned off for 5
minutes. The limit value can be changed in
WCT_GetFODParams().
WCT1011A/WCT1013A Automotive MP-A9 Wireless Charging Application User’s Guide, Rev. 0, 10/2017
NXP Semiconductors
49
