Rogowski Coils vs. Coaxial Shunts: A Comparison
Coaxial shunt or Rogowski coil for current measurement in double-pulse testing? There is no perfect answer - it depends on which figures matter most to your test, and on installation conditions. The two can be used together without interference and cross-check each other.
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Rogowski Coil Low-Frequency and Droop Characteristics
In principle a Rogowski coil cannot measure DC, so its detection sensitivity falls at low frequency; the -3 dB point is usually taken as the low-frequency cutoff. When the signal contains low-frequency components, the measured result can deviate from the actual current - take care in use. The cutoff and its roll-off specification vary by model; the roll-off (droop) characteristic refers to the response to a step pulse and is tabulated in Table 1.
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Optically Isolated Probes for SiC Double-Pulse Testing: Typical Applications
Double-pulse testing is the best way to characterize SiC dynamic parameters, and an optically isolated probe is the best tool for measuring VGS - especially on the high-side switch, where the challenge is greatest. With today's SiC MOSFET VGS(th) typically at 2-3 V, plus fast switching and high operating voltage, spurious turn-on is a bigger risk than with Si MOSFETs and IGBTs and deserves real attention.
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SiC and IGBT Dynamic Double-Pulse Testing: Procedure and Pitfalls
Understand the key IGBT parameters - Eon, Eoff, Tdon, Tdoff, Tr, Tf and the switching characteristics - and verify datasheet values while comparing the performance of different modules.
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