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Multifunctional structure-changing type DC convertor

A converter and variable structure technology, which is applied in the direction of conversion equipment with intermediate conversion to AC, can solve problems such as system parameter design problems, low efficiency, and system stability degradation, so as to reduce component redundancy, reduce costs, Reduce the effect of current surge

Inactive Publication Date: 2008-09-24
ZHEJIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fuel cell and the backup battery in the actual system have an overlapping area (for example, the output of the fuel cell is 200-400Vdc, and the voltage of the backup battery is 48-96Vdc), because the range of the input voltage is very wide, if a single converter is used to realize the converter function, there is almost no single topology that can efficiently realize voltage transformation under such a wide range of input voltage, so the efficiency of a single topology is relatively low in this input case, and at the same time, in order to achieve a wide range of input with a set of parameters If the system can work stably under the voltage, the parameter selection range is very narrow, which brings great difficulties to the design of the system parameters; if two different topologies are used to implement the converter in parallel, some components will be redundant With the increase of components, the stability of the system also decreases

Method used

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  • Multifunctional structure-changing type DC convertor

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Embodiment Construction

[0032] With reference to Fig. 1, the multifunctional variable structure type DC converter of the present invention, it comprises:

[0033] 1) DC input power Vin, used to provide DC voltage;

[0034] 2) A first DC-AC conversion circuit, used to invert the input DC voltage into a first high-frequency AC voltage, including a first main switching tube S1, a second main switching tube S2, and a first resonant capacitor CS1 , the first resonant inductor LS1, the first multi-pole multi-throw linkage switch K1 composed of the first, second, and third sub-switches K1-a, K1-b, and K1-c and the first shorting bar K1-d ; The drain of the first main switching tube S1 is connected to the first terminal 1 of the first sub-switch K1-a and the first terminal 2 of the second sub-switch K1-b, and the source is connected to the negative pole of the DC input power supply Vin and The second terminal 1 of the second sub-switch K1-b is connected, the drain of the second main switch S2 is connected t...

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Abstract

A multifunctional variable structure DC convertor disclosed by the invention comprises a DC power supply; an inverse circuit consisting of four switching tubes, two multipole-multithrow switches and two shorting bars, an insolating filter circuit; a rectification circuit consisting of four diodes, a multipole-multithrow switch and a shorting bar and an output filter capacitance. The circuit can obtain the DC convertor of the following five different functional structures by the different combinations of the three multipole-multithrow switches and the three shorting bars. When the input voltage range of the DC convertor is wide, current transforming can be realized by an optimal circuit topology according to the differences of the input voltages by converting a topology structure, thus improving the efficiency of the convertor, reducing the element redundancy of a system and reducing the cost.

Description

technical field [0001] The invention relates to a direct current converter, in particular to a multifunctional direct current converter without an LLC resonant circuit realized by using a variable topology structure. Background technique [0002] In practical industrial applications, converters often encounter a wide range of voltage input. For example, in fuel cell applications, it is often necessary to add a backup battery to the system to improve the stability of the fuel cell, thereby preventing fuel The failure of the battery will cause the entire system to lose power. The fuel cell and the backup battery in the actual system have an overlapping area (for example, the output of the fuel cell is 200-400Vdc, and the voltage of the backup battery is 48-96Vdc), because the range of the input voltage is very wide, if a single converter is used to realize the converter function, there is almost no single topology that can efficiently realize voltage transformation in such a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28
Inventor 陈威吕征宇邓哲戎萍
Owner ZHEJIANG UNIV
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