Integrated mixed energy source interface circuit topological structure for electric car

Abstract

The invention discloses an integrated mixed energy source interface circuit topological structure for an electric car. The integrated mixed energy source interface circuit topological structure comprises a two-way DC-DC interface circuit I connecting a power battery unit and a DC bus, an interface circuit II between the power battery unit consisting of an inductance element and a switch network and a super-capacitance unit, and a two-way DC-DC interface circuit III connecting the super-capacitance unit and the DC bus. The topological structure of the invention is different from the traditionalmixed energy source interface circuit, the two energy sources, i.e. a power battery and a super-capacitor are respectively provided with the two-way DC-DC interface circuit connected with the DC bus,the interface circuit II directly connecting the two energy sources can utilize the structure of the mixed energy source system to form a voltage balance circuit of the power battery unit adopting asuper-capacitor module of the mixed energy source as a core, so that a dynamic and static balance purpose of the voltage of the power battery units which are connected in series in the charging and discharging process can be realized, and no additional auxiliary voltage balancing apparatus is needed.

Description

technical field [0001] The invention relates to the field of energy storage technology and power supply, in particular to an integrated hybrid energy source interface circuit topology structure for electric vehicles, which is suitable for hybrid energy storage systems such as electric vehicles and urban rail transit. Background technique [0002] Restricted by the limited reserves of oil resources in the world and the increasing dependence of economic development on oil, the current shortage of oil resources has made the world's major automobile countries face huge challenges. From the perspective of environmental protection, fuel vehicles pollute the environment while consuming a large amount of oil resources. Under the environment of oil shortage, public awareness of environmental protection has increased significantly, government promotion, laws and regulations have been improved day by day, and people's recognition of electric vehicles has increased, electric vehicles ar...

AI Technical Summary

Problems solved by technology

When the power battery is used in series, the inconsistency of the terminal voltage will affect the utilization rate and service life of the whole power battery unit, which limits its wide application

In the traditional hybrid energy source system, the connection mode of the energy storage unit is relatively simple, and there is a lack of research on the topology of the power electronic interface circuit responsible for the connection function, especially the existing topology does not consider the interaction between different energy storage units. Direct connection without direct interconnection simplifies the composition and control of the system, splits the integrity of the hybrid energy storage system, and restricts the complementary play of the advantages and characteristics of different energy storage sources.

Images