Lossy triphase low-pass filter

A low-pass filter and filter technology, applied in the direction of output power conversion devices, electrical components, impedance networks, etc., can solve the problems of enhanced attenuation effect, weak attenuation effect, and increased attenuation loss, so as to reduce current load, The effect of reducing costs and reducing the required space

Active Publication Date: 2011-04-20
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of using a non-reactive resistor as the attenuation element 32 is that the attenuation effect is weak when the low-pass filter 30 is excited by resonance to a lesser extent.
When excited by a larger intensity, not only the attenuation effect will be enhanced, but also the attenuation loss will increase with the increase of the capacitor current at the quadratic level

Method used

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Embodiment Construction

[0022] image 3 Shown is a first embodiment of the lossy three-phase low-pass filter 34 of the present invention. The input of this lossy three-phase low-pass filter 34 is likewise connected to the output terminals 12 , 14 and 16 of the load-side converter 2 of a frequency converter. A three-phase load 28 is connected to the output terminals 22 , 24 and 26 of this low-pass filter 34 . This embodiment of the lossy three-phase low-pass filter 34 of the present invention is similar to known lossy three-phase low-pass filters 30 such as figure 2 The difference between the illustrated embodiments is that each attenuation element 32 employs two anti-parallel diodes 36 and 38 instead of a non-reactive resistor. By using anti-parallel diodes 36 and 38 as attenuation element 32, a considerable attenuation effect can be produced already at relatively low filter currents. As in the known implementations where a resistor is used as the damping element 32, the damping effect is still c...

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Abstract

The invention relates to a lossy triphase low-pass filter (34) having a filter choke (18), a filter capacitor (20), and an attenuation element (32) per phase of said low-pass filter (34), wherein one filter capacitor (20) and one attenuation element (32) each are electrically connected in series. According to the invention, two diodes (36, 38) are provided as attenuation elements, which are electrically connected to each other in an anti-parallel manner. In this manner a lossy triphase low-pass filter (34) is obtained, the power loss of which is significantly reduced without any loss of the attenuation effect.

Description

technical field [0001] The invention relates to a lossy three-phase low-pass filter according to the preamble of claim 1 or 2 . Background technique [0002] Voltage intermediate circuit converters (also known as "frequency converters") currently available on the market are often equipped with a so-called sinusoidal output filter on the load side. The task of this sinusoidal output filter is to filter out the high-frequency components in each pulse output voltage of the frequency converter, so that only the fundamental voltage remains on the load (especially the motor) connected to the load side contact of the frequency converter. This sinusoidal filter usually consists of a filter inductor and a filter capacitor connected as an LC low-pass filter. These filter elements cooperate so that the cut-off frequency of the sinusoidal filter lies between the maximum fundamental frequency of the frequency converter and the switching frequency. [0003] The LC low pass filter has a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H1/00
CPCH03H1/00H02M1/126
Inventor 胡贝特·席尔林本诺·魏斯
Owner SIEMENS AG
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