Elevator apparatus with rechargeable power supply and discharge control
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United States of America Patent
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Feb 18, 2003
Issued Date -
N/A
app pub date -
Aug 1, 2002
filing date -
Feb 28, 2000
priority date (Note) -
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Abstract
An elevator control apparatus includes a converter, an inverter, a controller for controlling a motor based on AC power having a variable voltage and a variable frequency supplied from the inverter and operating an elevator; a power storage unit for storing DC power; a charge/discharge control circuit that issues a drive signal such that discharge from the power storage unit increases within a range of power that can be discharged when an elevator is driven immediately following completion of uniform charging; and a charge/discharge circuit for starting uniform charging of the power storage unit in accordance with the drive signal. This arrangement permits quick discharging while effectively using discharge electric power until a state of charge is reached wherein regenerative electric power can be used for charging.
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