Energy feedback main circuit of motor driving system

A motor drive system, energy feedback technology, applied in the direction of circuit devices, DC network circuit devices, emergency protection circuit devices, etc., can solve the problems of grid voltage damage, driver or grid failure, waste of energy, etc., and achieve the effect of simple circuit

CN109347146AInactive Publication Date: 2019-02-15MIANYANG WEIBO ELECTRONICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-02-15
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment 1

[0028] An energy feedback main circuit of a motor drive system, including a rectification circuit, an energy feedback circuit, a pre-charging circuit, and an energy consumption braking protection circuit, wherein,

[0029] The rectifier circuit is used to rectify the mains 220V into a DC 310V through the rectifier bridge chip, and then control the on-off of the bus voltage through the on-off of the relay K1;

[0030] Energy feedback circuit, used for when the bus voltage is higher than DC310V, lower than DC410V, through the first DC conversion chip to recycle the voltage into DC48V, and store energy through the super capacitor; when the bus voltage returns to normal DC310V, through the second DC The conversion chip converts the stored energy into the DC310V required by the DC bus and incorporates it into the bus to provide power for the system;

[0031] Pre-charging circuit, used to protect the power part from surge current damage when the power supply is powered on or off;

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