Patent ID: 6460658
Filing Date: 2002-10-08
Classification: B66B

Abstract:
An elevator control apparatus comprising:a converter for rectifying AC power into DC power; an inverter for converting the DC power into AC power having a variable voltage and a variable frequency; a power storage unit connected to the converter and the inverter for storing DC power produced by the converter and for supplying DC power to the inverter for producing the AC power having a variable voltage and a variable frequency; a controller for controlling a motor driven by the AC power having the variable voltage and the variable frequency, the motor operating an elevator, the controller controlling supply of power simultaneously and independently from each of the converter and the DC power storage unit to the elevator; a charge/discharge control circuit controlling a state of charge of the power storage unit, outputting a drive signal to charge the power storage unit with the DC power from the converter only when the elevator is stopped, based on operational information regarding the elevator received from the controller, and outputting a stop signal to stop charging of the power storage unit when a voltage of the power storage unit reaches a preset voltage; and a charge/discharge circuit for starting charging of the power storage unit with the DC power in response to the drive signal, and stopping charging of the power storage unit in response to the stop signal.