Vin(th)
On
Vin
Ic
Vin(th)
trr
90%
50%
90%
ton
10%
toff
Figure 1. Switching Time Waveform Definitions
off
off
/Vin
on
on
Gate On
Vge (Inside IPM)
Fault (Inside IPM)
/ALM
Gate Off
normal
alarm
2ms(typ.)
tALM>Max.
tALM>Max.
tALM
①
②
③
Fault:Over-current,Over-heat or Under-voltage
Figure 2. Input/Output Timing Diagram
Necessary conditions for alarm reset (refer to ① to ③ in figure2.)
① This represents the case when a failure -causing Fault lasts for a period more than
tALM. The alarm resets when the input Vin is OFF and the Fault has disappeared.
② This represents the case when the ON condition of the input Vin lasts for a period
more than tALM. The alarm resets when the Vin turns OFF under no Fault conditions.
③ This represents the case wh en the Fault disappears and the Vin turns OFF within
tALM. The alarm resets after lasting for a period of the specified time tALM.
off
/Vin
on
Ioc
on
Ic
alarm
tdoc
/ALM
①
②
<tdoc
Figure 3. Over-current Protection Timing Diagram
Period ①: When a collector current over the OC level flows and the OFF command is input
within a period less than the trip delay time tdoc, the current is hard-interrupted
and no alarm is output.
Period ②: When a collector current over the OC level flows for a period more than the trip
delay time tdoc, the current is soft -interrupted. If this is detected at the lower
arm IGBTs, an alarm is output.
a
Fuji Electric Co.,Ltd.
MS6M0700
9/22
H04-004-03