Patent ID: 7813847
Filing Date: 2010-10-12
Classification: B60L

Abstract:
1. An electric car controller for controlling an electric car, which is provided with an inverter for receiving power supplied through an overhead power line and regenerating power through the overhead power line during a regenerative braking operation and an induction motor driven by the inverter, the electric car controller comprising: overhead power line voltage detecting means for detecting an overhead power line voltage on the overhead power line; ripple component detecting means for detecting a ripple component included in the overhead power line voltage detected by the overhead power line voltage detecting means; a first comparator means in which a predetermined first reference value is set, for comparing a level of the ripple component outputted from the ripple component detecting means with the first reference value; separation means for determining that a power failure occurs when the ripple component is smaller than the first reference value based on a comparison result obtained by the first comparator means and electrically separating the overhead power line and the inverter from each other; a second comparator means in which a predetermined second reference value larger than the first reference value is set, for comparing the level of the ripple component with the second reference value; and overhead power line voltage suppressing means for suppressing an increase of the overhead power line voltage when the ripple component is smaller than the second reference value based on a comparison result obtained by the second comparator means.