Abstract
A Short-circuit protection plays a vital role in the overall reliability
of intelligent power module(IPM), and where the shorter the duration of
short-circuit fault, the smaller the impact on the module. The
conventional VCE(sat) detection circuit suffers from a blanking time
problem, and thus to solve this problem, this paper aims to improve the
IPM short-circuit fast detection and protection circuit with integrated
shunts, to achieve the ultra-fast detection and protection of IPM
short-circuit faults. For the improved circuit, the selection method for
the component parameters of a compensation link of the improved circuit
is proposed, and the functions for the remaining parts in the circuit
are introduced. Finally, through experiments, it is verified that the
improved circuit can quickly detect various short-circuit faults, and
correspondingly start shutting down the switching tube at 490ns.
Compared with the conventional method, the detection time of the
proposed method and short-circuit loss for modules under different
short-circuit faults are significantly reduced.