Control Supply Uv Protection - Mitsubishi Electric PSSxxMC1Fx Manual

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DIPIPM+ 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, N-side of inverter part and Brake part 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
(V , V
D DB
0 4.0V (P, N)
-
4.0 UV (N), UV
-
Dt
UV (N)-13.5V
Dt
UV (P) 13.0V
-
DBt
13.5 16.5V (N)
-
13.0 18.5V (P)
-
16.5 20.0V (N)
-
18.5 20.0V (P)
-
20.0V (P, N)
-
(note) 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 2016
)
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 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.
The control circuit might be destroyed.
dV/dt ≤ +/-1V/μs, Vripple ≤ 2Vp-p
Operating behavior
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