Electric energy feedback type battery charging-discharging and capacity grading device

Abstract

The invention discloses an electric energy feedback type battery charging-discharging and capacity grading device. The electric energy feedback type battery charging-discharging and capacity grading device comprises a Buck-Boost bidirectional converter, a bidirectional isolated switching power supply, a bidirectional DC / AC current transformer and a control circuit, wherein the Buck-Boost bidirectional converter is used for boosting and reducing direct-current voltage and providing constant current and constant voltage for charging and discharging batteries; the bidirectional isolated switching power supply is used for boosting and reducing direct-current voltage; the bidirectional DC / AC current transformer is used for transforming the voltage between direct current and alternating current; the control circuit is used for monitoring the Buck-Boost bidirectional converter, the bidirectional isolated switching power supply and the bidirectional DC / AC current transformer. Through the electric energy feedback type battery charging-discharging and capacity grading device, not only can the batteries be charged at constant current, but also the electric energy discharged by the batteries can be fed back to a power grid, so that energy is recycled; through the bidirectional isolated switching power supply, the utilization rate of electric energy is increased, and the electricity saving effect is achieved; electrical isolation is achieved through a high-frequency isolation transformer; in the charging process, high-frequency synchronous rectification is adopted, so that efficiency is improved, the power factor on the grid side is increased, and power quality harming factors such as the harmonic content are reduced.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to an electric energy feedback type battery charge and discharge and capacity distribution device. Background technique [0002] With the rapid development of the national economy and the continuous advancement of science and technology, the application of power supply systems based on batteries or batteries as backup power is becoming more and more common. Such as electric locomotives, DC power systems of power systems, DC uninterruptible power systems and AC uninterruptible systems (UPS) in communications, railways, subways, airports, fire protection and other fields require a large number of batteries. [0003] Battery formation, that is, repeated charging and discharging of batteries, is an important link in the battery production process, and the electric energy feedback type battery charging and discharging and capacity separation equipment is the main equipment for battery fo...

AI Technical Summary

Problems solved by technology

[0004] Due to technical and cost factors, the current charging and discharging methods of battery formation equipment are as follows: the charging process uses a traditional linear constant current source, the charging topology is relatively simple, and the use of uncontrollable rectification will bring various factors that reduce power quality to the grid, resulting in The low power factor and high harmonic content on the grid side will generate a large number of grid pollution sources and pollute the grid; the discharge process uses resistors or power semiconductor devices to generate heat and consume electricity, resulting in a large amount of heat, resulting in a waste of energy resources, and requiring the installation of a large number of high-power air conditioners. Cool down, consume a lot of power, the efficiency of the whole machine is low, and there is no power feedback device

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