Energy recovery control method and elevator system
CN117755927BActive Publication Date: 2026-06-26GREE ELECTRIC APPLIANCE INC OF ZHUHAI +1
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GREE ELECTRIC APPLIANCE INC OF ZHUHAI
- Filing Date
- 2023-12-22
- Publication Date
- 2026-06-26
AI Technical Summary
Technical Problem
In existing elevator systems, after the energy storage unit is fully charged, the traction machine continues to charge the energy storage unit, causing the DC bus voltage to rise, triggering overvoltage protection, and causing the elevator system to malfunction.
Method used
In the elevator system, a braking resistor is introduced in series with a switch. By monitoring the DC bus voltage and controlling the switch to conduct when preset conditions are met, the braking resistor is connected to the DC bus, consuming the electrical energy generated by the traction machine and avoiding overvoltage protection.
Benefits of technology
This effectively avoids overvoltage protection being triggered by excessive DC bus voltage, ensuring the reliable operation of the elevator system.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN117755927B_ABST
Abstract
The application discloses an energy recovery control method and an elevator system. The elevator system comprises an energy storage unit and a braking resistor. The energy storage unit is connected between two direct-current buses of the elevator system. The braking resistor is connected between the two direct-current buses in series with a first switch. The method comprises the following steps: monitoring a direct-current bus voltage when the elevator system performs energy recovery; and controlling the first switch to be turned on when the direct-current bus voltage meets a preset condition, so that the braking resistor is connected to the direct-current bus. According to the application, the overvoltage protection caused by the excessively high direct-current bus voltage can be avoided, and the reliable operation of the elevator system is ensured.
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