Fuji Electric Co., Ltd.
3-8
MT6M12343 Rev.1.0
Dec.-2016
Chapter 3
Detail of Signal Input/Output Terminals
Fig.3-5 Operation sequence of VB(*)
*1
Under voltage protection (upper side arm)
<1> When VB(*) is under
V
B(ON)
, the upper side IGBT is OFF state.
After VB(*) exceeds
V
B(ON)
, the HVIC starts to operate from the next input signal.
The fault output VFO is constant (high level) regardless VB(*).
<2> After VB(*) falls below
V
B(OFF)
, the upper side IGBT remains OFF state.
But the fault output VFO keeps high level.
<3> The HVIC starts to operate from the next input signal after UV is reset.
*1 VB(*) : VB(U)-U,VB(V)-V,VB(W)-W
V
B(ON)
<1>
V
B(ON)
V
B(OFF)
<2>
<3>
Input signal
VB(*) supply voltage
Collector current
VFO output voltage
UV detection
UV detection
