Bidirectional topology structure used in vehicle charging system

Abstract

The invention relates to a bidirectional topology structure used in a vehicle charging system. The bidirectional topology structure comprises a transformer, a wiring terminal, a charging terminal, a first half-bridge converting module and a second half-bridge converting module. The transformer is provided with a primary side and a secondary side opposite to the primary side; the wiring terminal is arranged on the primary side of the transformer and used for being electrically connected with an alternating-current power grid and household loads; the charging terminal is arranged on the secondary side and used for being in butt joint with a vehicle-mounted battery; the first half-bridge converting module is connected between the primary side of the transformer and the wiring terminal; the second half-bridge converting module is connected with a control module between the secondary side of the transformer and the charging terminal. The control module is provided with a power tube control unit. The control module can adjust the duty ratio of a corresponding position through a first power tube, a second power tube, a third power tube, a fourth power tube, a fifth power tube and a sixth power tube, and then the charging efficiency of the bidirectional topology structure is improved. Meanwhile, the bidirectional topology structure is relatively simple, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of smart grids, in particular to a bidirectional topology applied to a car charging system. Background technique [0002] The traditional electric vehicle charging system only uses the on-board battery as an electrical device for the AC grid. With the rise of the smart grid concept, the vehicle battery not only obtains electrical energy from the AC grid, but also transfers energy to the grid. This is the so-called V2G (Vehicle-to-grid) technology. In addition, when the household load is connected to the electric vehicle charger, the vehicle battery can supply power to the household load when the AC power grid is out, which realizes the V2H (Vehicle-to-home) technology. [0003] However, traditional on-board battery chargers and grid-connected converters usually require a two-stage topology, which will reduce the transmission efficiency of the car charging system due to the excessive number of power devices ...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a bi-directional topology structure with high charging efficiency and simple structure applied to the car charging system for the technical problems of low charging efficiency, complex structure and high cost of the above-mentioned car charging circuit.

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