Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Reexamination Certificate
2008-06-30
2010-06-08
Leykin, Rita (Department: 2837)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
C361S023000, C361S001000, C318S432000, C318S434000, C323S274000, C323S273000, C323S284000, C363S050000, C363S052000, C363S053000, C363S055000, C363S056010, C363S056020, C363S056030, C363S056040
Reexamination Certificate
active
07733616
ABSTRACT:
Each of three-phase arm of an inverter has first and second switching elements connected in series together at a connection point to the corresponding phase coil of the three-phase motor. Control device turns on the first switching element of the i-th (i is a natural number smaller than four) for a predetermined time period, and determines that the second switching element of the i-th arm has a short fault, when an overcurrent exceeding a predetermined threshold is detected within the predetermined time period. The predetermined time period is shorter than a time period from a time point of turning on the first switching element of the i-th arm to a time point of attaining the predetermined threshold by a current flowing through a path extending from a power supply line through the second switching element of the remaining arm other than the i-th arm to a ground line.
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Leykin Rita
Oliff & Berridg,e PLC
Toyota Jidosha & Kabushiki Kaisha
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