Fuji Electric Co., Ltd.
3-7
MT6M12343 Rev.1.0
Dec.-2016
Chapter 3
Detail of Signal Input/Output Terminals
Fig.3-4 shows of high side (VB(U)-U,VB(V)-V and VB(W)-W) UV (Under Voltage protection) circuit
block of the control power supply.
Fig.3-5 shows operation sequence of VB(U)-U,VB(V)-V,VB(W)-W Under Voltage operation.
As shown in Fig.3-4, diodes are electrically connected to the VB(U,V,W), U,V,W and COM terminals.
These diodes protect the IPM from an input surge voltage. Don’t use these diodes for a voltage clamp
because the IPM might be destroyed if the diodes are used as a voltage clamp.
Fig.3-4 Control supply of high side VB(*) UV protection circuit
2. Under Voltage (UV) protection of high side power supply terminals VB(U,V,W)
Vcc
< HVIC >
GND
Vs
OUT
VB
IGBT ( H )
IGBT ( L )
Vcc
C 3
D
R
< BSD >
COM
N ( U , V , W )
U , V , W
P
VB ( U , V , W )
V
CCH
Vcc
< LVIC >
GND
U
,
V
,
W
OUT
R
Driver
V
CCL
C 4
+
C 1
C 2
+
Alarm
timer
OC
VFO
FO
V
CCL
UV
VB
UV
in
