Two-stage type DC converter with high voltage input and low-voltage large current output

A DC converter and high-voltage input technology, applied in the direction of converting DC power input to DC power output, output power conversion device, and adjusting electrical variables, etc., to achieve optimal design, simple thermal design and modular design, and stable input voltage Effect

Inactive Publication Date: 2010-08-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to propose a new type of multi-module two-stage converter combination based on the traditional two-stage converter, referring to the advantages of the multi-module input series-parallel combination converter and combining the characteristics of the DC transformer, to solve the problem of Power conversion problems in high-power high-voltage input low-voltage high-current output occasions

Method used

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  • Two-stage type DC converter with high voltage input and low-voltage large current output
  • Two-stage type DC converter with high voltage input and low-voltage large current output
  • Two-stage type DC converter with high voltage input and low-voltage large current output

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Embodiment Construction

[0020] The main circuit of the multi-module two-stage high-voltage input, low-voltage, and high-current output DC converter is shown in Figure 1. It is characterized in that: the main circuit is composed of n modules with the same structure—module No. 1, module No. 2...n No. module, the input ends and output ends of the n modules are all connected in parallel, and each module is a front and back stage structure, the front stage is a DC converter, and the latter stage is a DC transformer.

[0021] Taking module No. 1 as an example, the specific main circuit topology is shown in Figure 2. Module No. 1 is composed of a DC converter module 1 in the preceding stage and a DC transformer module 1 in the subsequent stage. The dotted line box on the left side of Figure 2 shows the specific topology of the front-stage DC converter module 1. The front-stage DC converter module 1 adopts a non-isolated Buck topology. Each Buck module includes a switch tube, a diode, and an inductor. and a...

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Abstract

The invention discloses a DC converter with high voltage input and low-voltage large current output, comprising a main circuit and a control circuit. The main circuit is composed of n-numbered modules with the same structure, the input ends of the n-numbered modules are connected with the output ends thereof in parallel, each module is of a preceding or succeeding stage structure, wherein the preceding stage is a non-isolated DC converter, and the succeeding stage is an isolated DC potential transformer. The control circuit comprises a three-ring control circuit, synchronously staggered frequency dividing circuits among the modules, and a voltage open-loop control circuit, wherein the three-ring control circuit comprises a succeeding stage output filter inductive current equalizing outer ring, a succeeding stage output middle ring and a succeeding stage output filter inductive current inner ring. The convertor is applied to circumstances with high voltage input and low-voltage large current output, and has the advantages of small volume, high efficiency and high reliability.

Description

technical field [0001] The invention relates to an isolated direct-current converter with a multi-module two-stage structure and high-voltage input, low-voltage and high-current output characteristics, which belongs to the high-power direct-current step-down technology in power conversion. Background technique [0002] At present, high-voltage input, low-voltage, and high-current output DC converters are used in various fields such as communication power supplies, alkali metallurgical industries, and aerospace power systems. In order to improve the efficiency and reliability of the converter, there are many researches on the topology and control methods of the DC converter with high voltage input, low voltage and high current output. [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 magnetic isolation. The loss and volume of high-frequency isolation trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/00H02M3/335H02M3/155
Inventor 曹剑坤朱琦王慧贞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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