Patent ID: 6827182
Filing Date: 2004-12-07
Classification: B66B

Abstract:
An elevator control apparatus, comprising:a converter for converting A.C. power from an A.C. power source into D.C. power; an inverter connected to the converter by D.C. buses for converting the D.C. power from the converter into A.C. power having a variable voltage and a variable frequency to drive an electric motor to operate an elevator; a power accumulator connected across the D.C. buses for accumulating D.C. power from the D.C. buses during regenerative operation of the electric motor and for supplying D.C. power accumulated to the electric motor during a powered operation of the electric motor; a charge/discharge control circuit for controlling charging and discharging of the power accumulator; a charging/discharging state measuring circuit for measuring state of charge of the power accumulator; a power failure detector for detecting failure of the A.C. power source, a control power supply device for supplying power to the elevator control apparatus during a failure of the A.C. power source; an illumination power supply apparatus for supplying power to an illumination circuit of the elevator during a failure of the A.C. power source; and control means for, when a failure of the A.C. power source is detected by the power failure detector, supplying power from the power accumulator to the inverter, to control circuits, and to the illumination circuit of the elevator through the charge/discharge control circuit to continue operation of the elevator.