© by SEMIKRON / 2017-09-07 / Technical Explanation / SKiiP
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5.3.8.2 Integrated DCB-temperature sensor
The integrated DCB-temperature sensor is a chip resistor with temperature dependent characteristic. The
sensor is placed on the copper trace of the BOT IGBT (collector potential) which ensures that the measured
temperature of the DCB is close to the IGBT chip location. The measurement circuit which is realized on the
secondary side of the driver board generates an equivalent voltage which is digitized, transmitted to the
primary side via a transformer for galvanic isolation and converted into an analogue signal on primary side.
The analogue temperature signal is available on the SKiFace interface (see Table 5—1) with characteristic
given below:
Table 5—9: Characteristics of the DCB-temperature sensor circuit
Temperature signal characteristics Value
Trip level T
135°C
Minimum measurable temperature T
+30°C
Analogue temperature signal CMN_TEMP @ 150°C 10V
Analogue temperature signal CMN_TEMP @ 30°C 0V
Accuracy of analogue signal @ T
±5%
Bandwidth, f
5Hz (-3dB)
Threshold level for reset after failure event 90°C
Figure 5.31: Characteristic between DCB-sensor temperature and the voltage at CMN_TEMP
In case of over temperature the HALT signal will be set to LOW and an error is indicated. If the DCB-
temperature is lower than 90°C again and if the switching input signals HB_TOP and HB_BOT are set to
LOW the HALT signal will be released (recessive HIGH state).
sensor
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