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Frequency converter with current-limiting device and method for operating frequency converter

A technology of current limiting device and inverter, which is applied in the field of inverters, can solve problems such as damage, and achieve the effects of limiting current intensity, saving components, and reducing manufacturing costs

Inactive Publication Date: 2012-12-12
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, the precharge resistor R 1 , R 2 , R 3 The power dissipated in the transitions can heat these precharge resistors strongly and eventually destroy

Method used

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  • Frequency converter with current-limiting device and method for operating frequency converter
  • Frequency converter with current-limiting device and method for operating frequency converter
  • Frequency converter with current-limiting device and method for operating frequency converter

Examples

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Embodiment Construction

[0035] The examples show preferred embodiments of the invention.

[0036] exist figure 2 A frequency converter 24 is shown in . The mains connection 26 of the frequency converter 24 is connected to the power supply 14 via main contactors (not shown). The power supply 14 corresponds to the power supply shown in FIG. 1 with the same reference numeral.

[0037] In the frequency converter 24, a rectifier 28 generates a rectified voltage, referred to here as a DC voltage U, from the AC voltage of the three mains phases of the power supply 14. ZK . exist figure 2 In the shown rectifier 28, the DC voltage U is generated by means of full-wave rectification ZK . The rectifier 28 has three half-bridges with diodes for this purpose.

[0038] DC voltage U ZK It is applied between the two DC voltage connections 30 , 32 of the DC voltage output 34 of the rectifier. Busbars ZK+, ZK− of the intermediate circuit 36 ​​of the frequency converter 28 are respectively connected to the DC v...

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PUM

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Abstract

The invention relates to a frequency converter (24). Different inverters in the frequency converter can be connected with a busbar (ZK +, ZK -) of an intermediate circuit (36). A frequency converter (24) user can also then achieve the connection. Thus, the connection may be in error. For example, short circuit might be caused in the intermediate circuit (36) and results in overheating of components of the frequency converter (24) when an intermediate circuit capacitor is charged. The purpose of the invention is to provide adequate protection for the frequency converter and the components thereof. According to the frequency converter (24) of the present invention, a current-limiting device (44) is used for limiting the current intensity of the current from the power supply source (14) to the intermediate circuit (36).The current-limiting device (44) is designed to be used for capacitively coupling the intermediate circuit (36) with a limited current (IZK) and a power joint (26) through the capacitors (C1, C2 and C3).

Description

technical field [0001] The invention relates to a frequency converter for operating an electric motor on a power supply. The frequency converter has a rectifier with which the alternating voltage of the power supply can be converted into a rectified voltage. An intermediate circuit capacitor is connected to the DC voltage output of the rectifier. The intermediate circuit capacitor can be charged with current from a power supply, the amperage of the charging current being limited by means of a current limiting device. Background technique [0002] The basic mode of operation of a frequency converter of the type described is explained in more detail below with the aid of the block diagram shown in FIG. 1 . The frequency converter 10 shown has a mains connection 12 . By means of this mains connection, the frequency converter is connected to the power supply, or in short to the power supply 14 , via a (not shown) main contactor. The power supply 14 may be, for example, a thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/06H02M1/32
CPCH02M1/36H02M7/062H02M5/458H02M1/0085H02M7/05
Inventor 诺伯特·斯塔德特
Owner SIEMENS AG