A topology circuit and system based on single battery power conversion

Abstract

The invention discloses a topological circuit based on electrical energy transformation of a battery cell. The topological circuit comprises multiple double-tube half-bridge modules and a voltage output end, and the double-tube half-bridge modules are in cascade connection to form the topological circuit. Each double-tube half-bridge module comprises two switch components and two battery cell interfaces. The invention further discloses an electrical energy transformation system including the topological circuit. The system comprises the electrical energy transformation topological circuit used for converting the electrical energy transformation of the battery cell into alternating currents, a battery management module used for monitoring battery states in real time, and a control unit used for monitoring the operation states of the system. By the adoption of the scheme, independent control of the battery cell can be achieved, the efficiency of the system can be improved, and the balance of the battery cell can be achieved. The double-tube half-bridge topological circuit is adopted, flexible expansion can be achieved, and the operation of improving the output voltage class is easy to achieve. An improved level approximates to a modulation strategy, a low-frequency switching characteristic can be achieved, and switch losses can be reduced greatly.

Description

technical field [0001] The invention relates to an electric energy conversion system, in particular to a topological circuit and system based on single battery electric energy conversion. Background technique [0002] In the current various electric energy conversion circuits, the energy storage part or the DC side usually uses a battery pack. However, there are many problems in the use of storage battery packs, and its charging and discharging methods are generally carried out in groups. During the charging and discharging process of batteries in the same battery pack, due to the influence of factors such as manufacturing process, inspection methods, loading and unloading and transportation, there are certain differences in the terminal voltage, internal resistance and self-discharge current of each battery. There will be imbalance and inconsistency, which obviously increases the difficulty of the battery management module, and group work is not an optimal application mode...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a topological circuit and system based on single battery power conversion to solve the mutual constraints of single batteries in the prior art. Many problems, excessive switching loss, and low output waveform quality, while realizing the power conversion, it also realizes the balanced use of the state of charge (SOC) of the single battery

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