Control system for energy feedback-brake unit integrated machine of frequency conversion elevator

Abstract

The invention discloses an energy feedback-brake unit integrated machine control system of a frequency conversion elevator. The control system comprises a main circuit, a control circuit and a brake unit circuit, wherein the brake unit circuit comprises a switch transistor, a drive circuit of the switch transistor, a diode, a comparator and / or a door. In the normal working state, the system inverts direct current voltage of a direct current bus connected with a transducer into alternating current voltage with the same frequency and phase as an electric net and feeds the voltage back to the electric net, and has functions of saving electricity; when fault occurs, the system is automatically switched to the brake unit and operates; at that time, the voltage of the direct current bus converts electrical energy into heat energy through a resistor of the brake unit and emits the heat energy out; and the elevator can operate as usual and ensure that daily life of an elevator user is not influenced. The system has simple wire connection, does not need to debug, and has safe and reliable operation.

Description

technical field [0001] The invention relates to an energy feedback-braking unit integrated control system, which is especially suitable for the frequency conversion elevator industry. Background technique [0002] With the continuous development of urban construction and the continuous increase of high-rise buildings, elevators are widely used in the national economy and life. As a means of transportation running vertically in high-rise buildings, elevators are inseparable from people's daily life. Today, while the economy is developing, the scope of the power grid is getting larger and larger. Using elevators to "create" energy (energy regeneration elevators) will open up new ways for the construction industry to be green and resource-saving; at the same time, due to the frequent use of elevators and the The airtightness of the space has very strict requirements on the safety and reliability of the elevator. [0003] The traditional elevator energy feedback system include...

AI Technical Summary

Problems solved by technology

[0003] The traditional elevator energy feedback system includes a main circuit and a control circuit. The main circuit includes a three-phase reactor, six switching tubes, a drive circuit and a sampling circuit. When the system is operating normally, the control circuit sends six sine wave signals to the main circuit , the six switching tubes of the main circuit are turned on, at this time, the DC bus voltage of the inverter connected to the main circuit is converted into an AC voltage through space vector inversion and fed back to the power grid through a three-phase reactor, which plays the role of energy regeneration; but When the energy feedback system fails, the system will be disconnected from the power grid, and the elevator inverter connected to the main circuit cannot work normally at this time, resulting in the elevator not running normally

Images