MT6M15962a
© Fuji Electric Co., Ltd. All rights reserved.
3-16
Fig.3-10 UV alarm output of lower arm
5.3 Multiple alarm signal output from lower arm during control power supply under voltage protection (UV)
Some X series IPM have multiple independent control ICs on the lower arm. These alarm signal outputs
are a common output on the lower arm. Therefore, there are some cases when several alarm are output
because of the variation in the under voltage protection level of the control ICs. If d
v
/d
t
of
V
UV
is less than
0.5V/ms in the vicinity of
V
CC
, there is possibility of alarm output such as shown in Figure 3-10. (This is
not an abnormal phenomenon.)
V
CC
: Supply voltage of pre-driver
V
UV
: Under voltage protection level
V
ALM
: Alarm signal voltage
t
ALM(UV)
: Alarm signal hold time
