Energy feedback main circuit of motor driving system

Abstract

The invention discloses an energy feedback main circuit of a motor driving system. By the adoption of the energy feedback circuit, electric energy with a busbar voltage higher than DC310V and lower than DC410V is converted and stored; the stored electric energy is converted into DC310V to be merged into a busbar after the busbar voltage is restored to be a normal voltage DC310V; and when the voltage is higher than DC410V, an energy consumption brake protection circuit is used for performing release, so that the problems, that the energy is wasted because the redundant energy is directly released in a traditional energy consumption braking mode, or the energy feedback circuit directly feeds the electric energy back to an alternating-current side, and a back driver is damaged or a power gridis pulled down because a voltage of the power grid is ultrahigh, are solved; and while electric energy feedback is effectively utilized, the voltage of the power grid can be prevented from being excessively damaged, and the situation that the back driver is damaged or the power grid is pulled down because the voltage of the power grid is ultrahigh can be avoided.

Description

technical field [0001] The invention relates to an energy recovery circuit of a power supply system, in particular to an energy feedback main circuit of a motor drive system. Background technique [0002] In the motor drag control system, the motor will continue to enter the variable speed motion states such as deceleration, pause, stop, acceleration, etc. The different motion states have different energy requirements. When the motor accelerates, its energy demand is large, and its energy demand is small when it decelerates or stops. The usual processing method is to release the excess energy by braking with energy consumption. The disadvantage of this treatment method is a waste of energy, which not only wastes energy, but also pollutes the environment. [0003] There are also energy feedback designs on the market now. The design method is to realize energy feedback through modules such as inverter, rectifier bridge, step-up, and step-down, that is, when the load power in...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the traditional energy consumption braking method in the prior art directly releases excess energy braking, which wastes energy, or some energy feedback circuits directly feed back electric energy to the AC side, and the ultra-high voltage of the power grid will damage the back-end driver or The problem of the power grid being pulled down, the present invention provides a motor drive system energy feedback main circuit to solve the above problem

Images