Control Supply Uv Protection - Mitsubishi Electric PSS**S72FT Manual

<Dual-In-Line Package Intelligent Power Module>
1200V Mini DIPIPM with BSD Series APPLICATION NOTE

2.2.2 Control Supply UV Protection

The UV protection is designed to prevent unexpected operating behavior as described in Table 2-2-4.
Both P-side and N-side have UV protecting function. However, fault signal (Fo) output only corresponds to
N-side UV protection. Fo output continuously during UV state.
In addition, there is a noise filter (typ. 10μs) integrated in the UV protection circuit to prevent instantaneous
UV erroneous trip. Therefore, the control signals are still transferred in the initial 10μs after UV happened.
Table 2-2-4 DIPIPM operating behavior versus control supply voltage
Control supply voltage
0 4.0V (P, N)
-
4.0 UV (N), UV
-
Dt
UV (N)-13.5V
Dt
UV (P)
DBt
13.5 16.5V (N)
-
13.0 18.5V (P)
-
16.5 20.0V (N)
-
18.5 20.0V (P)
-
20.0V
-
Ripple Voltage Limitation of Control Supply
If high frequency noise superimposed to the control supply line, IC malfunction might happen and
cause DIPIPM erroneous operation. To avoid such problem happens, line ripple voltage should meet the
following specifications:
Publication Date: September 2015
In this voltage range, built-in control IC may not work properly.
Normal operating of each protection function (UV, Fo output etc.) is
not also assured.
Normally IGBT does not work. But external noise may cause DIPIPM
malfunction (turns ON), so DC-link voltage need to start up after
control supply starts-up.
UV function becomes active and output Fo (N-side only).
(P)
DBt
Even if control signals are applied, IGBT does not work
IGBT can work. However, conducting loss and switching loss will
13.0V increase, and result extra temperature rise at this state,.
-
Recommended conditions.
IGBT works. However, switching speed becomes fast and saturation
current becomes large at this state, increasing SC broken risk.
(P, N) The control circuit might be destroyed.
dV/dt  +/-1V/μs, Vripple2Vp-p
Operating behavior
13