© by SEMIKRON / 2017-09-07 / Technical Explanation / SKiiP
4
Page 31/73
Figure 5.16: Connection of reserved and not used signals at the user controller board
5.3 Gate driver board
5.3.1 Overview
The SKiiP
®
4 gate driver board includes the following functions:
• Digital signal transmission (refer to chapter 5.3.2)
• Power-on Reset (refer to chapter 5.3.3)
• Dead time generation (refer to chapter 5.3.4)
• Short pulse suppression (refer to chapter 5.3.5)
• IntelliOff switching (refer to chapter 5.3.6)
• Failure management (refer to chapter 5.3.7)
The driver is based on digital signal processing technology, which provides individual control parameter
settings and the transmission of galvanic insulated sensor signals. The digital signal processing approach
ensures high noise rejection. IGBT overvoltage especially during high current turn-off conditions are
detected and reduced by the gate driver through an implemented function further called intelligent turn-off
control circuit.
5.3.2 Digital signal transmission
The driver board provides two independent signal channels communicating from low voltage to high voltage
side to transfer switching and sensor signals. The signals are transferred by dedicated pulse transformers
which are designed according to the standard of reinforced isolation.
This approach ensures:
• Avoidance of temperature and aging effects
• Galvanic Isolation between low (primary) and high voltage (secondary) side inclusive temperature
and DC-Link voltage feedback
• High noise immunity
5.3.3 Power-On-Reset
The Power-On-Reset time is defined as t
POR
in the SKiiP
®
4 data sheet.
The driver board processes a Power-On-Reset after turning on the supply voltage. During t
POR
the HALT
signal is set to LOW. Without any error being present, the HALT signal will be released (recessive HIGH-
State) after the Power-On-Reset is completed.
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