Energy-saving device for elevator

Abstract

The invention discloses an energy-saving device for an elevator. The energy-saving device comprises an elevator frequency converter connected to a power supply, a control unit, and a super capacitor connected in parallel to the elevator frequency converter. The control unit connected to the super capacitor is used for realizing conduction with a connection branch circuit of the super capacitor when a car of an elevator moves downwardly relative to a counter weight, thereby charging the super capacitor. When the car of the elevator moves upwardly relative to the counter weight, the control unit controls the super capacitor carries out discharging to realize upward operation of the car; when the super capacitor completes the discharging, the control unit is connected to the elevator frequency converter to provide power for the car operation. The super capacitor includes a DC-DC power conversion module connected in parallel to the elevator frequency converter and a capacitor connected to the DC-DC power conversion module. Using the energy-saving device, the 30 to 40% of power can be saved on the condition of maintaining normal operation of the elevator.

Description

technical field [0001] The invention relates to an elevator energy-saving device. Background technique [0002] figure 1 A simplified diagram of the existing elevator power supply structure is given. When the car moves upwards relative to the counterweight, the motor drives the car to move upwards. expend. Although there is currently a technical solution for connecting the charging and discharging circuit in series with the consuming resistor in order to reduce energy consumption, the effect is not outstanding. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides an elevator energy-saving device, which can effectively save electricity by 30-40% while maintaining the normal operation of the elevator. [0004] An elevator energy-saving device, comprising an elevator frequency converter connected to a power supply, a control device and a supercapacitor; the supercapacitor is connected in parallel with the elevato...

AI Technical Summary

Problems solved by technology

[0002] figure 1 A simplified diagram of the existing elevator power supply structure is given. When the car moves upwards relative to the counterweight, the motor drives the car to move upwards. consume

Although there are currently technical solutions for connecting charge and discharge circuits in series with the consumption resistors in order to reduce energy consumption, the effect is not outstanding.

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