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Three-port DC converter

A DC converter and three-port technology, applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, etc., can solve the problems of many conversion stages, large volume and weight, and low system efficiency, and achieve reduction System volume, high power density, effect of reducing control circuits

Inactive Publication Date: 2010-10-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

Problems solved by technology

attached figure 1 A system composed of two independent converters, whose converters are controlled in a decentralized manner, has a large volume and weight; figure 1 In the system shown in (a), when the battery supplies power to the load, it needs to go through two stages of conversion, and the additional figure 1 In the system shown in (b), when the main power supply is used to charge the battery, it needs to go through two stages of transformation. There are many transformation stages and the system efficiency is low.

Method used

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Embodiment Construction

[0029] For the convenience of description, the following combined figure 2 ~ attached Figure 5 The technical solution of the present invention is described.

[0030] The basic idea of ​​this technical solution is to integrate the isolated converter and the non-isolated bidirectional converter together to realize the connection of three ports, and at the same time add a free freewheeling path to the primary winding of the transformer, and then introduce a free mode , so as to realize the control of battery and load voltage at the same time.

[0031] The circuit structure of the three-port DC converter is as attached figure 2 As shown, the circuit consists of an input DC source V in , battery V b , the primary circuit 10, the transformer 20, the secondary circuit 30 and the load R o constitute, wherein, the transformer 20 is composed of the primary winding N P , the first secondary winding N S1 and the second secondary winding N S2 Constituted, the secondary side circ...

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Abstract

The invention discloses a three-port DC converter and belongs to the technical field of power electronic converters. The three-port DC converter consists of an input DC source, a storage battery, a primary side circuit, a secondary side circuit, and a transformer. The primary side circuit is connected with the input DC source and the storage battery simultaneously; the secondary side circuit is connected with load; and the primary side and secondary side are in electrical isolation through the transformer. The three-port DC converter is characterized in that: due to a converter, the power management and control of a main power supply, the storage battery, and the load is realized, and the functions of a plurality of single-input single-output converters are realized; and compared with a mode of adopting a plurality of single-input single-output converters, the three-port DC converter has the advantages of reducing the number of switching devices and related control circuits, improving the conversion efficiency, simplifying the control circuit, achieving high reliability, adopting more compact layout and unified and effective management, improving the system stability, reducing the system cost, reducing the volume, and improving the power density.

Description

technical field [0001] The invention relates to a three-port DC converter, which belongs to the technical field of power electronic converters, and in particular to the technical field of power converters in the technical field of new energy power generation. Background technique [0002] With the increasingly severe energy crisis and environmental pollution, new energy power generation technologies such as solar energy, wind energy, and fuel cells have become the focus of attention and research around the world. According to whether the new energy power generation system is connected to the public grid, it can be divided into two modes: grid-connected operation and independent operation. The independent new energy power generation system is a very important way for the application of new energy power generation. It can solve the problem of power supply in remote mountainous areas, isolated islands and other areas without power grids. In addition, the structure of the indepe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
Inventor 吴红飞邢岩
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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