Inverter Overcurrent Protection And Motor Gatekill Configuration - Infineon EVAL-M1-CTE620N3 User Manual

EVAL-M1-CTE620N3 User Manual
iMOTION™ Modular Application Design Kit
Hardware description of EVAL-M1-CTE620N3
5.1.3

Inverter Overcurrent protection and Motor Gatekill configuration

Figure 17 displays the overcurrent protection circuitry. The current sensing signal I_Shunt is connected to ITRIP
via through the comparator U5, and ITRIP is filtered through capacitor C23.
+3.3V
1Kohm 1/8W 5%
R28
ITRIP
ITRIP
C13
DNI
GND
Figure 17 Overcurrent protection circuit on the EVAL-M1-CTE620N3 evaluation board
The typical value of ITRIP positive going threshold V
14.7Apeak.
If the motor peak current larger than the setting value I
trigger low which is mean that the signal Gatekill is active. For iMOTION™ IMC1xx control IC, there are three
types of Gatekill Input Source (as shown in Figure 18). For Gatekill Input Source configured Gatekill-Pin or Both,
iMOTION™ control IC will stop the Motor when the signal GateKill is active.
But please note that, if select comparator for Gatakill Input Source, the external Gatakill signal will be not used.
And the current sensing signal I_Shunt will be compared by the internal comparator with the "Gatekill
Comparator Reference" value set in MCEWizard only.
Figure 18 Gatekill configuration in MCEWizard for EVAL-M1-101T
User Manual
R30 10Kohm 1/8W 1%
GND
R33 1Kohm 1/8W 1%
1
U5
4
R32 1Kohm 1/8W 1%
3
LM397
C16
C19
4700pF 16V
4700pF 16V
+15VCC
C14
10uF 16V GND
∗
30 + 33
=
R36 1Kohm 1/8W 1%
R34 1Kohm 1/8W 1%
R35 1Kohm 1/8W 1%
is 300mV. So the inverter output peak current is about
IT, TH+
33
+ +
/ /
for more than ITRIP Input filter time, RFE will be
trip
21 of 37
I_UVW-
GND
D8 BAT60A I_W+
I_W+
D9 BAT60A I_V+
I_V+
D10 BAT60A I_U+
I_U+
Revision 1.0
2018-08-23