Patent ID: 9103888
Filing Date: 2015-08-11
Classification: G01R,H02H

Abstract:
1. A protection circuit for a semiconductor switching device, comprising: an overcurrent determiner including at least one comparator and operated according to a gate signal to determine whether a load current flowing through the semiconductor switching device controlling the load current is an overcurrent; a load open determiner including at least one comparator and determining whether a load is open, on the basis of a detection value from a current detector detecting the load current; an error detector including a plurality of logic gates and generating a fault signal when it is determined that the overcurrent flows or the load is open, while the gate signal is in a turned on level of the semiconductor switching device; a level shifter shifting a level of the gate signal and providing the level-shifted gate signal to the error detector; a first filter installed between the level shifter and the error detector to remove noise included in a signal from the level shifter; a second filter installed between the overcurrent determiner and the error detector to remove noise included in a signal from the overcurrent determiner; and a third filter installed between the load open determiner and the error detector to remove noise included in a signal from the load open determiner.