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DC (direct current) voltage converter

A technology of voltage converter and converter, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, instruments, etc., and can solve problems such as demand, a large number of power devices, and low transmission efficiency, and achieve easy two-way transmission, structure Simple, easy-to-package effects

Inactive Publication Date: 2012-02-01
韩彤
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above practices not only lead to low power transmission efficiency, but also require a large number of power devices

Method used

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Embodiment Construction

[0016] Such as figure 1 As shown, the device involved in the present invention can use the voltage as U 1 The energy of the primary side voltage source passes through half-controlled power devices (such as thyristors, etc.) T 11 Inflow by the reactor L 1 , L 2 and n intermediate energy modules M 1 , M 2 to M n . When the inflow energy meets the requirements, through the intermediate energy module M 1 , M 2 to M n control so that the reactor L 2 and n basic units M 1 , M 2 to M n The energy on the half-controlled power device T 21 , reactor L 3 into the secondary capacitance C 2 And its parallel voltage secondary terminal U 2 .

[0017] right figure 1 Mid-semi-controlled power device T 11 and T 21 Both ends are anti-parallel connected to the half-controlled power device T 12 and T 22 , so that the energy can flow in the opposite direction, that is, the voltage can also be changed to U 2 The energy of the secondary voltage source passes through the half-co...

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Abstract

The invention discloses a bidirectional DC (direct current) voltage converter which is suitable for various medium-high voltage DC systems. The topology of the converter consists of a primary side branch, a middle energy branch and a secondary side branch; the branches are separated or connected through a semi-control power device; the current change rate is limited by an inductor; and the power is controlled by a middle energy module. The middle energy module is formed by connecting a semi-bridge full-control power device in parallel with a capacitor. The inductor in the topology can be omitted; and when the conditions of unidirectional power transfer or low-to-high power transfer and the like are met, the semi-control power device in the topology can be omitted or replaced. The control process of the topology is divided into a stage that energy flows into the middle energy module and a stage that energy flows out of the middle energy module; the current of the two stages can be controlled respectively; or the current of only one stage is controlled, and the unidirectional continuity of a resonator and the semi-control power device is utilized in the other stage. By using the topology, the power transmission cost can be lowered, and the power transmission system can be simplified.

Description

technical field [0001] The invention relates to a topology of a bidirectional DC voltage converter. The invention also relates to two methods of controlling the converter. Background technique [0002] On the one hand, in medium and high voltage DC lines, in order to achieve voltage conversion, the voltage is generally changed from DC to AC, then transformed by an AC transformer, and finally converted back to DC. The above approach not only leads to low power transmission efficiency, but also requires a large number of power devices. On the other hand, under the same voltage level and loss requirements, three-phase AC transmission lines must use more materials than DC transmission lines. [0003] German scholar R.Marguardt combined the half-bridge fully-controlled power device structure and capacitors in parallel to form a basic module, connected the basic modules in series, and applied them to DC-to-AC or AC-to-DC converters. level converter (MMC). Due to the voltage li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/10H02M3/155
Inventor 韩彤
Owner 韩彤
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