Apparatus for controlling charging and discharging of supplemental power supply of an elevator system

An apparatus for controlling an elevator, comprising:

• a converter for converting an alternating current from an alternating current power supply into direct current power by rectifying the alternating current;
• an inverter for driving an electric motor by converting the direct current power from said converter into variable-voltage variable-frequency alternating current power, the electric motor driving an elevator;
• a direct current bus connecting said converter to said inverter;
• a power accumulator connected to said direct current bus, said power accumulator accumulating direct current power from said direct current bus during regenerative operation of the elevator, and supplying accumulated direct current power to said direct current bus during operation of the elevator;
• measuring means for measuring at least one of temperature, current, and voltage of said power accumulator;
• and
• charge/discharge control means for controlling charging and discharging of said power accumulator from or to the direct current bus and adjusting maximum charging and discharging current of said power accumulator according to an output from said measuring means, wherein a fully-charged state and a completely-discharged state of said power accumulator are determined from at least one output of said measuring means.

An apparatus for controlling an elevator, comprising:

• a converter for converting an alternating current from an alternating current power supply into direct current power by rectifying the alternating current;
• an inverter for driving an electric motor by converting the direct current power from said converter into variable-voltage variable-frequency alternating current power, the electric motor driving an elevator;
• a direct current bus connecting said converter to said inverter;
• a power accumulator connected to said direct current bus, said power accumulator accumulating direct current power from said direct current bus during regenerative operation of the elevator, and supplying accumulated direct current power to said direct current bus during operation of the elevator;
• measuring means for measuring at least one of temperature, current, and voltage of said power accumulator;
• and
• charge/discharge control means for controlling charging and discharging of said power accumulator from or to the direct current bus and adjusting maximum charging and discharging current of said power accumulator according to an output from said measuring means, said charge/discharge control means including, for adjusting the maximum charging and discharging current, a current limit circuit limiting a charging/discharging current command value to a charging/discharging current limit value in response to at least one output from said measuring means.