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Bus protection device and method of frequency converter and frequency converter

A busbar protection and frequency converter technology, applied in the field of frequency converters, can solve problems such as false triggering of energy feedback

Pending Publication Date: 2021-01-15
GREE ELECTRIC APPLIANCES INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a busbar protection device, method and inverter for a frequency converter to solve the problem of false triggering of energy feedback caused by inaccurate bus voltage sampling, so as to improve the accuracy of bus voltage sampling to avoid false triggering of energy feedback Effect

Method used

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  • Bus protection device and method of frequency converter and frequency converter
  • Bus protection device and method of frequency converter and frequency converter
  • Bus protection device and method of frequency converter and frequency converter

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Embodiment Construction

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0030] According to an embodiment of the present invention, a bus protection device for a frequency converter is provided. see figure 1 A schematic structural view of an embodiment of the device of the present invention is shown. The bus protection device of the frequency converter can be applied in a motor system such as a compressor system, and the bus protect...

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Abstract

The invention discloses a bus protection device and method of a frequency converter and the frequency converter. The device comprises a sampling unit and a control unit, wherein the sampling unit is configured to sample a bus voltage of the frequency converter to obtain a bus voltage sampling value and a common-mode voltage sampling value; the control unit is configured to determine the state of the bus voltage of the frequency converter according to the bus voltage sampling value and the common-mode voltage sampling value; and the bus voltage of the frequency converter is protected accordingto the state of the bus voltage of the frequency converter. According to the device, a problem of false triggering of energy feedback caused by inaccurate bus voltage sampling can be solved, and the effect of improving the bus voltage sampling accuracy to avoid false triggering of energy feedback is achieved.

Description

technical field [0001] The invention belongs to the technical field of compressors, and in particular relates to a bus protection device and method for a frequency converter and a frequency converter, in particular to a bus voltage undervoltage detection and protection device, method and frequency converter for a frequency converter. Background technique [0002] In the inverter bus protection of the magnetic levitation centrifuge, when there is an abnormality in the bus voltage sampling link, such as poor contact of the sampling line, the energy feedback will be triggered by mistake and the bus voltage will be pumped up, causing the magnetic levitation bearing to fall directly to the shaft under high-speed rotation. . [0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not mean that the above content is admitted as prior art. Contents of the invention [0004] The purpose of the present invention is...

Claims

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Application Information

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IPC IPC(8): H02H7/12G01R19/165H02P27/06
CPCG01R19/16547H02H7/1216H02P27/06
Inventor 李义丽张良浩孙瑞祥
Owner GREE ELECTRIC APPLIANCES INC
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