Frequency conversion device and its power expansion method

Abstract

The invention discloses a frequency conversion device and a power expanding method thereof. The device includes: a filtering unit cavity, a power module and an electronic control module which are connected through a busbar or a cable. The power module is connected to the bus bar by a vertically aligned plug-in structure, and the filtering unit cavity and the power module are respectively arranged on both sides of the electronic control module. The frequency conversion device may further include two or more power modules arranged side by side. Each power module further includes two sub modules which are longitudinally symmetrical and have interchangeable functions as a rectifying unit or an inverting unit to achieve a rectifying or inverting function independently, or rectifying and inverting functions simultaneously. The invention overcomes the following defects in the prior art: the current transforming unit is not concentrated enough, there is no isolation between high and low voltages of the whole cabinet, and the EMC performance is poor. Meanwhile, the invention can further solve the following technical problems existing in the conventional frequency conversion device: it is difficult to expand power, the expanding range of power is narrow, the cost of re-designing and the cost of production time are high, and the price cost is high and the market response speed is slow.

Description

technical field [0001] The invention relates to the field of industrial and civil frequency conversion, in particular to a frequency conversion device with a power expansion structure applied in the field of power conversion and a power expansion method thereof. Background technique [0002] With the rapid development of power electronics technology, computer technology and automatic control technology, electric transmission technology is facing a new revolution, and it is also developing in a more "green" direction. , Good performance and become the mainstream. Since the introduction of the "Twelfth Five-Year Plan", energy conservation and emission reduction are the key to the development of all walks of life. Under this background, various energy-saving and environmental protection products are more widely used and the prospects are brighter. Thanks to the strong pull of strategies such as energy saving, emission reduction, and green environmental protection, frequency co...

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Problems solved by technology

[0007] In view of this, the purpose of the present invention is to provide a frequency conversion device and its power expansion method, which overcomes the existing frequency conversion devices with insufficient concentration of converter units, no isolation of high and low voltage in the whole cabinet, poor EMC performance, difficult power expansion or power expansion range Narrow, high time cost and price for redesign and production, and slow response to technical problems in the market

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