The impact of DC-bus impedance on the switching performance of low-voltage silicon power MOSFETs

Typical DC-bus stabilization for low-voltage power circuits consists primarily of ceramic capacitors due to the capacity density and low equivalent series resistance (ESR) resulting in low conduction losses. Particularly in hard-switching and hard-commutation operation, the low ESR and high equivale...

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Bibliographic Details
Published in:Elektrotechnik und Informationstechnik 2023-02, Vol.140 (1), p.82-94
Main Authors: Vollmaier, Franz, Langbauer, Thomas, Krischan, Klaus, Petrella, Roberto
Format: Article
Language:English
Subjects:
Capacitors
Commutation
Computer Hardware
Conduction losses
Damping
Data buses
Electric potential
Electrical Engineering
Engineering
Equivalence
Impact analysis
Impedance
Inductance
Originalarbeit
Software Engineering/Programming and Operating Systems
Switching
Transistors
Voltage
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Summary:Typical DC-bus stabilization for low-voltage power circuits consists primarily of ceramic capacitors due to the capacity density and low equivalent series resistance (ESR) resulting in low conduction losses. Particularly in hard-switching and hard-commutation operation, the low ESR and high equivalent series inductance (ESL) of the capacitors in the commutation path restrict the damping of the switch node voltage overshoot and introduce high-frequency ringing, reducing the voltage margin of the transistor. Therefore, this paper analyzes the impact of the DC-bus impedance and proposes a DC-bus snubber based on an RC network to form the DC-bus impedance’s characteristic, which minimizes the overshoot voltage. A comprehensive simulation using measurement-derived component models is shown, which is verified by an in-situ measurement on a test PCB. Furthermore, transient measurements using a double pulse test setup show the effectiveness of the proposed approach.
ISSN:0932-383X
1613-7620
DOI:10.1007/s00502-022-01114-0