Dc Bus And Discharge Resistors; Igbt Current Measurement - Broadcom Infineon EasyPIM ACPL-337J Reference Manual

ACPL-337J Reference Manual Infineon EasyPIM™ 1B IGBT Module EB600-337J Evaluation Board

4.3 DC Bus and Discharge Resistors

The DC bus capacitor bank on the EB600-337J consists of 2 × 470-µF, 450V electrolytic capacitors in series connection, a
1-µF, 850V film capacitor, and a 68-nF, 1200V ceramic capacitor, as shown in Figure 13. These components are added to
the design to simplify the evaluation of the gate driver and the semiconductor switching characteristics and to provide a
high-quality DC bus for full inverter utilization. For an appropriate voltage sharing on series-connected electrolytic capacitors
and safety discharging purposes, two ceramic 39-kΩ resistors are connected in parallel to each electrolytic capacitor
(Figure 13).
Figure 13: Disposition of the Gate Resistors

4.4 IGBT Current Measurement

To enable users to obtain a semiconductor current waveform during switching instances, the board is designed with two
dedicated holes mechanically positioned to cover the traces connecting the low-side emitters and the negative potential of
the DC bus capacitors, as shown in Figure 14. Holes with ɸ = 5 mm enable using a Rogowski current probe for current
measurement purposes.
Figure 14: Dedicated Holes Enable Users to Measure the Current of the Single IGBT
Broadcom ACPL-337J-EB600-RM100
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