Power converter and DC choke therefor

A technology of power conversion system and choke, which is applied in the direction of output power conversion device, conversion equipment for intermediate conversion to DC conversion, conversion of AC power input to AC power output, etc., which can solve the problem of increasing cost, occupying space, complex switching Problems such as high cost of control system, differential mode device and common mode device

Active Publication Date: 2013-05-29
ROCKWELL AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, separate differential and common mode devices are costly and occupy space in the power conversion system
Other techniques include modifying the switching waveforms of one or both of the rectifier and inverter stages, but such techniques usually require complex switching control systems
Common and differential mode noise effects can also be addressed by using isolation transformers within the power conversion system, but these transformers add cost to the system and take up space

Method used

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  • Power converter and DC choke therefor
  • Power converter and DC choke therefor
  • Power converter and DC choke therefor

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Embodiment Construction

[0032] Referring now to the drawings, various embodiments or implementations are described below in conjunction with the drawings, wherein like reference numerals are used to refer to like elements throughout and various features are not necessarily drawn to scale.

[0033] The inventors have recognized that existing common mode choke designs suffer from various problems and difficulties. Inherent disadvantages of these devices include the difficulty of avoiding the effects of partial saturation on the common-mode inductance. Furthermore, the many turns of the windings in these conventional devices can significantly increase proximity losses. In this regard, common mode chokes have hitherto been difficult to design due to the complexity of calculating or simulating the magnetic flux distribution.

[0034] The disclosed embodiments provide a single link choke that combines differential mode inductors and common mode voltage rejection. These embodiments find utility in conjunc...

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PUM

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Abstract

A power conversion system and a DC link choke therefore are presented, in which a continuous core structure is provided with first and second legs around which four or more windings are located, with one or more shunt structures providing a magnetic flux path between intermediate portions of the first and second legs.

Description

Background technique [0001] Motor drives and other power conversion systems convert electrical power from one form to another and can be used in a variety of applications, such as powering electric motors using power converted from single-phase or multi-phase AC input sources. A common form of motor drive is a current source converter (CSC), in which a rectifier converts input ac power from a single-phase or multi-phase ac input source to provide dc current to a dc link (dclink) circuit. Output inverters convert the DC link current into single-phase or multi-phase AC output power to drive motor loads. Such power conversion systems experience differential and common mode voltages and currents, which can cause various problems, including degradation of the power conversion system and / or motor load. For example, electric motors are susceptible to damage or performance degradation due to the presence of excessive common-mode voltages across the motor load. Previously, low-voltag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/44H01F27/24H01F27/28
CPCH01F2038/026H01F38/04Y02E60/60H02J3/36H01F3/12H01F38/023H01F37/00H02M1/14H02M5/4585H01F30/06H02M1/123
Inventor 肖原纳维德·R·扎加里程仲元魏理想
Owner ROCKWELL AUTOMATION TECH
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