A self-adaptive blanking time circuit for fast IGBT de-saturation short-circuit protection

Abstract

This paper proposed a self-adaptive blanking time (SABT) circuit for fast IGBT de-saturation short-circuit detection. When IGBT normally turns on or experiences fault under load (FUL), the blanking time is implemented by detecting the variation of IGBT collector-toemitter voltage VCE. While when IGBT is under hard switching failure (HSF), the blanking time is determined by detecting gate voltage VGE. The simulation with the UMC 0.6 μm 700 V technology indicates that the proposed SABT circuit can quickly detect FUL and HSF. Compared to the conventional blanking time circuit, the SABT circuit can shorten the fault detection time of FUL from 1.3 μs to 35.5 ns, while the fault detection time of HSF condition is reduced from 2.329 μs to 294 ns.

Characteristic analysis and diagnosis of short-circuit fault in armature winding of four-phase variable flux reluctance machine

“…Armature winding short-circuit(AWSC) fault is one of the most common faults in VFRMs [7], and the early features of the AWSC fault are not obvious. If the AWSC fault is not diagnosed and treated quickly in the early stage, it may damage the entire insulation of the power generation system and cause severe security threats [8,9,10,11]. Therefore, accurate AWSC fault detection of VFRMs is highly necessary.…”

A short circuit protection circuit for SiC MOSFET with self-adjustive blanking time

“…Moreover, the current density is very high due to the small die size, which leads to its SC withstand time as short as 3us, while it is typically 10us for Si IGBT [16,17]. The commercial gate drivers for SiC MOSFET still use the DESAT protection method at present [18,19,20,21,22,23,24,25], where a blanking time is used to avoid false trigger during switching transients, and it is determined by the blanking capacitor and the DESAT reference voltage. Furthermore, the blanking time is always set a longer time to avoid the false trigger in practical applications.…”