MT6M15962a
© Fuji Electric Co., Ltd. All rights reserved.
2.8 IGBT chips over heating protection function (
T
jOH
)
Over heating protection function detects the IGBT chip surface temperature by the built-in
temperature sensor on each IGBT chip. If the IGBT chip temperature continuously exceeds the over
heating protection level (
T
jOH
) for about 1ms, the IGBT is judged to be in an over heating state and the
IGBT is turned off softly to prevent thermal destruction.
When the
T
jOH
state is detected, the protection function is activated and alarm signal is output. The
T
jOH
state alarm signal output period (
t
ALM
) is approximately 8ms.
• As hysteresis
T
jH
is provided, protection operation is reset after 8ms (
t
ALM
) and normal operation is
resumed if
T
vj
is below (
T
jOH
-
T
jH
) and the input signal is OFF.
• Even if the alarm factor is resolved within 8ms (
t
ALM
), the protection operation continues until the
end of the period of 8ms (
t
ALM
) elapses. During this period, the IGBT will not be turned on.
The case temperature over heating protection function (
T
cOH
), which is built in the previous IPM
series, is not built in this X series. The IGBT chip is protected by the
T
jOH
protection function.
2.9 Temperature warning output function (
T
jW
)
Temperature warning output function directly detects the IGBT chip surface temperature by the built-
in temperature sensor on the Y phase IGBT chip. If the IGBT chip temperature continuously exceeds
the warning temperature level (
T
jW
) for about 1ms, the IGBT is judged to be in an over heating state
and a temperature warning signal is output from the warning signal output terminal. With this function,
it is possible to determine in advance that the IPM is overheated before it is stopped by over heating
protection. During this state, the over heating protection function and alarm signal output function will
not operate. (Even if the temperature warning output signal is generated, the protection is not activated
and the IPM continues to operate.) The temperature warning signal output period (
t
WNG
) continues until
the factor is released.
• As hysteresis
T
jWH
is provided, warning output signal is canceled if
T
vj
is below (
T
jW
-
T
jWH
).
This function is available only in the Fuji 7
th
generation X series IGBT-IPM in the following package.
P626 , P636(6in1) , P638 , P630(6in1) , P631(6in1)
3-7
