| Abstract |
More power electronic applications use a voltage source dclink
as the source to generate either ac or dc. The power level
is still increasing and more energy is stored in the dc-link.
Despite the active protection, a high-power IGBT still has a
small risk of exhibiting a violent rupture in the case of a fault,
and one solution is to protect the converter with high-speed
fuses. This paper discusses failures in three phase inverters,
and where it is best to place protecting fuses in the converter.
Experiments made with 400 A, 1200 V IGBT switches show
that rupture can be avoided by use of fast fuse protection. The
problem of adding inductance is treated, the inductance of
existing high-speed fuses are measured, and possible future
low-inductance fuse designs are discussed. |
