Controller of elevator

Abstract

This invention provides a controller of an elevator for stably controlling charging and discharging operations of a power accumulating device by using a cheap secondary battery of a low capacity, without damaging energy saving effects obtained by charging. Therefore, the controller of the elevator comprises a converter 2 for rectifying AC power and converting the AC power to DC power; an inverter 4 for converting the DC power to AC power of a variable voltage and a variable frequency to operate the elevator; a power accumulating device 11 for accumulating DC power from a DC bus 3 at a regenerative operation time of the elevator and supplying the DC power accumulated on the DC bus at a power running operation time; a charging-discharging control circuit 15 for controlling charging and discharging operations of the power accumulating device; a series connecting body, arranged between DC buses, and constructed by a gate 16 for regenerative current control and a regenerative resistor 17; a regenerative control circuit 19A for controlling an operation of the gate for regenerative current control; and a charging-discharging state measuring device 14A for measuring charging and discharging states of the power accumulating device. The charging-discharging control circuit 15A controls the charging and discharging operations of the power accumulating device in accordance with a measuring value of a bus voltage and a measuring value of the charging and discharging states.

Dependencies are inferred from the claim text.