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Frequency converter with simplified pre-charging circuit

A frequency converter and circuit technology, applied in the field of frequency converters, can solve the problems of high cost and large total volume.

Pending Publication Date: 2021-09-21
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the overall volume is still large due to the need for both a pre-charge circuit and a filter circuit
Therefore, the cost is still high

Method used

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  • Frequency converter with simplified pre-charging circuit
  • Frequency converter with simplified pre-charging circuit
  • Frequency converter with simplified pre-charging circuit

Examples

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Embodiment Construction

[0034] according to figure 1 , the frequency converter has a rectifier 1 on the input side. A further device 2 is arranged downstream of the rectifier 1 on the output side. The frequency converter also has at least one backup capacitor 3 which is arranged between the rectifier 1 and the further device 2 . Another device is usually designed as an inverter. In this case we speak of an intermediate circuit converter. However, this further device can also be designed differently, for example as a direct voltage consumer, a direct voltage network, a photovoltaic system or an energy store.

[0035] The rectifier 1 has U, V, W phases on the input side, which are connected to L1 , L2 , L3 of a supply network 5 via a front circuit 4 . Both the rectifier 1 and the supply network 5 are thus polyphase, ie each have a plurality of phases U, V, W or L1 , L2 , L3 . The phases U, V, W of the rectifier 1 are referred to below as input-side phases U, V, W to distinguish them from the phase...

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PUM

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Abstract

The invention relates to a frequency converter with a rectifier (1) on the input side and at least one support capacitor (3) arranged downstream of the rectifier (1). The rectifier (1) has multiple half-bridges (6), via which a respective input-side phase (U, V, W) of the rectifier (1) feeds the support capacitor (3). The input-side phases (U, V, W) are connected to grid-side phases (L1, L2, L3) of a multiphase supply grid (5) via a preceeding circuit (4). Each grid-side phase (L1, L2, L3) is connected to one of the input-side phases (U, V, W) within the preceeding circuit (4) via a respective phase capacitor (9). Each grid-side phase (L1, L2, L3) is additionally directly connected to another input-side phase (U, V, W) within the preceeding circuit (4) via a respective switch (10) such that the grid-side phases (L1, L2, L3) are short-circuited with the input-side phases (U, V, W) when the switches (10) are closed, and each phase capacitor (9) connects two grid-side phases (L1, L2, L3) or two input-side phases (U, V, W) together. The frequency converter has a controller (11) which keeps the switches (10) open when pre-charging the support capacitor (3) and closes the switches when a specified charge state (Z1) of the support capacitor (3) is reached.

Description

technical field [0001] The invention relates to a frequency converter, [0002] - wherein the frequency converter has a rectifier on the input side and at least one backup capacitor arranged downstream of the rectifier, [0003] - wherein the rectifier has a plurality of half-bridges through which the respective input side phases of the rectifier supply the backup capacitors, [0004] - wherein the input side phase of the rectifier is connected to the network side of the polyphase power supply network through a pre-circuit, [0005] - wherein the network-side phases are connected in the upstream circuit to the corresponding one input side via corresponding phase capacitors. Background technique [0006] Mains-powered inverters usually require a filter circuit and a pre-charging circuit between the power supply network and the rectifier on the input side of the inverter. Filtering circuits are used to limit network interference. The pre-charging circuit is only required w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02M5/458H02M7/12H02M1/32
CPCH02M1/36H02M5/4585H02M7/125H02M7/757H02M7/758H02M1/0064H02M7/05H02M7/062H02M7/2173H02M7/219
Inventor 亚历山大·亨斯勒胡贝特·席尔林
Owner SIEMENS AG
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