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Figure 5.23: No short circuit Figure 5.24: Short circuit

during operation

Figure 5.25: Short circuit

during turn on

After the blanking time has expired, the desaturation protection will be triggered as soon as V

> V

CEstat

and will lead to a soft turn off of the IGBT (high turn off resistor). The HALT signal will be set to LOW and

an error is indicated accordingly.

5.3.7.7 Thermal protection (over temperature protection)

The SKiiP employs a thermal sensor on the same substrate where also the power chips are assembled.

Since the temperature sensor is located close to the IGBT the actual and precise IGBT temperature cannot

be acquired from the distance especially not under dynamic load variations. Consequently the protection

function derived from the substrate temperature sensor’s temperature needs evaluation under the real

application conditions such as peak current, load profile etc and suitable protection levels shall be set.

5.3.8 Analogue signals / sensor functionality

5.3.8.1 Load current sensor

Each half bridge module (refer to Figure 2. 1) has an integrated load current sensor. The measured current

is normalized to a corresponding voltage and available at the SKiFace interface (see Table 5—1).

Table 5—8: Signal characteristic of current measurement

Signal Characteristics per SKiiP

4 Value

3-fold 4-fold 6-fold

Analogue minimum current trip level I

TRIPSC

HB_I = 10V 2700A 3600A 5400A

Typical ratio of current analog value [mv/A] 3,70 2,78 1,85

Accuracy of analogue signal @ I

TRIPSC

over full temperature range ±3%

Small signal bandwidth, f0

Iana

50 kHz

Figure 5.26: Characteristics between current and the voltage at HB_I, SKiiP

4 3-fold

SEMIKRON SKiiP 4 User Manual

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