Controller scheduling constant current charging of a rechargeable power source of an elevator system
First Claim
1. A controller for scheduling constant-current charging of a rechargeable power source of an elevator system, the controller comprising:
- a converter for rectifying AC power from an AC power source to produce DC power;
an inverter for converting DC power into AC power having a variable voltage and a variable frequency for driving an electric motor operating an elevator;
DC buses connecting said converter to said inverter;
a rechargeable power accumulating device connected across said DC buses, accumulating DC power from the DC buses during regenerative operation of the electric motor, and supplying accumulated DC power to the DC buses during powered operation of the electric motor;
charging-discharging control means for controlling charging and discharging of said power accumulating device with respect to the DC buses; and
charging-discharging state measuring means for measuring at least one of temperature, charging and discharging currents, and charging and discharging voltages of said power accumulating device, wherein said charging-discharging control means schedules constant-current charging of said power accumulating device based on at least one measurement by said charging-discharging state measuring means that indicates deteriorated charging characteristics of said power accumulating device.
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Accused Products
Abstract
A controller of an elevator for reducing the number of execution times of uniform charging of a power accumulating device and having higher energy saving effects. The controller has a converter, an inverter, a power accumulating device arranged between DC buses, a charging-discharging control circuit for controlling charging and discharging operations of the power accumulating device, and a charging-discharging state measuring device for measuring at least one of temperature, charging and discharging currents, and charging and discharging voltages of the power accumulating device. The charging-discharging control circuit sets the execution of uniform charging of the power accumulating device on the basis of an output of the charging-discharging state measuring device, and executes only the required uniform charging. Thus, an elevator with the power accumulating device having larger energy saving effects is constructed.
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Citations
7 Claims
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1. A controller for scheduling constant-current charging of a rechargeable power source of an elevator system, the controller comprising:
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a converter for rectifying AC power from an AC power source to produce DC power;
an inverter for converting DC power into AC power having a variable voltage and a variable frequency for driving an electric motor operating an elevator;
DC buses connecting said converter to said inverter;
a rechargeable power accumulating device connected across said DC buses, accumulating DC power from the DC buses during regenerative operation of the electric motor, and supplying accumulated DC power to the DC buses during powered operation of the electric motor;
charging-discharging control means for controlling charging and discharging of said power accumulating device with respect to the DC buses; and
charging-discharging state measuring means for measuring at least one of temperature, charging and discharging currents, and charging and discharging voltages of said power accumulating device, wherein said charging-discharging control means schedules constant-current charging of said power accumulating device based on at least one measurement by said charging-discharging state measuring means that indicates deteriorated charging characteristics of said power accumulating device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification