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Two-path two-transistor forward DC (Direct Current) converter with serially-connected transformers

A technology of series transformers and DC converters, applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., to achieve the effects of reduced volume and weight, reduced current rating, and convenient device selection

Inactive Publication Date: 2011-05-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at proposing a new type of forward topology on the basis of the traditional forward converter combined with the characteristics of the DC transformer to solve the problem of power conversion in the occasion of high-power high-voltage input, low-voltage and high-current output

Method used

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  • Two-path two-transistor forward DC (Direct Current) converter with serially-connected transformers
  • Two-path two-transistor forward DC (Direct Current) converter with serially-connected transformers
  • Two-path two-transistor forward DC (Direct Current) converter with serially-connected transformers

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Embodiment Construction

[0017] The main circuit of the dual-circuit dual-tube forward DC converter with transformers connected in series is as follows: figure 1 As shown, the combination structure of two forward converters with two transformers in series is adopted, that is, the transformer of each forward circuit is formed by two transformers in series. The primary sides of the two forward converters are connected in parallel, and the corresponding secondary sides of the two forward converters are connected in parallel, that is, the corresponding secondary sides that do not belong to the same transformer are connected in parallel, and share one output filter circuit (output filter inductor and capacitor).

[0018] The specific main circuit topology is as figure 1 shown. The main body is composed of two forward converters with two secondary sides, the two primary sides are connected in parallel, the two secondary sides are interleaved in parallel, and share one output filter circuit. Each dual-tube...

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Abstract

The invention relates to a two-path two-transistor forward DC (Direct Current) converter with serially-connected transformers, solving the problem of device selection difficulty in a high-power output occasion because of great currents borne by a rectifier diode and a freewheeling diode at the secondary side of a traditional two-path two-transistor forward converter. In a high-power occasion, a single transformer is adopted, and difficulties lie in cooling, structural design and mounting because of the great capacity of the single transformer. The invention provides the two-path two-transistor forward DC converter with serially-connected transformers, applied to a high-power two-transistor forward DC converter of a great-current output type so as to solve the problems of overlarge single current rating at the secondary side and device selection difficulty, and in addition, the problem of great capacity of the single transformer is solved due to the serially-connected transformers. The circuit of the DC converter is characterized in that the main circuit comprises two two-transistor forward converters connected in parallel at the primary side, and either two-transistor forward converter is provided with two serially-connected transformers at the primary side and adopts a crossed and parallel-connected structure at the secondary side, that is to say, the corresponding secondary sides of the two paths of the transformers are connected. By means of the invention, the power rating of the single transformer and the current ratings of the rectifier diode and the freewheeling diode at the secondary side are reduced.

Description

technical field [0001] The invention relates to a double-circuit double-tube forward DC converter with a series transformer, which belongs to medium and high-power DC conversion technology in power conversion. Background technique [0002] At present, high-current output DC converters are applied to various fields such as communication power supply, alkali metallurgical industry and aerospace power supply system. In order to improve the efficiency and reliability of the converter, there are many studies on the topology and control methods of the high-current output DC converter. [0003] In the case where the input and output of the circuit require isolation, this type of DC converter usually uses a high-frequency isolation transformer to achieve electrical isolation. The loss and volume of high-frequency isolation transformers occupy a large proportion in high-power DC transformers, so how to optimize the design to reduce the loss and volume of high-frequency isolation tra...

Claims

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Application Information

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IPC IPC(8): H02M3/338
Inventor 朱琦王慧贞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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