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On-line detecting device and method for bus capacitor of frequency converter, and frequency converter

A bus capacitance and detection device technology, applied in the field of frequency converters, can solve problems such as time-consuming and laborious, on-site operation, and achieve the effects of improving efficiency, accurate judgment, and accurate aging test

Active Publication Date: 2019-04-09
HITACHI ELEVATOR CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to provide an on-line detection device and method for inverter bus capacitance and inverter

Method used

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  • On-line detecting device and method for bus capacitor of frequency converter, and frequency converter
  • On-line detecting device and method for bus capacitor of frequency converter, and frequency converter
  • On-line detecting device and method for bus capacitor of frequency converter, and frequency converter

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Embodiment Construction

[0044] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. A preferred embodiment of the application is shown in the drawings. However, the present application can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.

[0045] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to and integrally integrated with the other element, or there may be an intervening element at the same time. The terms "control", "first end", "second end" and similar expressions are used herein for the purpose of description only.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as common...

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Abstract

The invention relates to an on-line detecting device and method for a bus capacitor of a frequency converter, and a frequency converter. The on-line detecting device for the bus capacitor of the frequency converter comprises a direct current power supply circuit, a detection capacitor, a detection resistor, a peak detection circuit and a controller for being connected with the frequency converter,wherein the direct current power supply circuit can charge the bus capacitor of the frequency converter; the detection capacitor and the detection resistor are connected in series and then connectedin parallel to two ends of the bus capacitor; the peak detection circuit is connected with the detection capacitor and the detection resistor, obtains a peak signal of the voltage transient change amount of the bus capacitor, and transmits the peak signal to the controller; and the controller obtains the internal resistance of the bus capacitor based on the peak signal. The aging situation of thebus capacitor can be judged more precisely by the change of the internal resistance of the bus capacitor. Based on this, the frequency converter can diagnose the internal resistance of the bus capacitor in milliohm level, which makes the aging test more accurate. At the same time, the diagnosis process of on-line detection of the internal resistance can be carried out automatically without manualintervention, which improves the efficiency of testing.

Description

technical field [0001] The present application relates to the technical field of frequency converters, in particular to an on-line detection device and method for bus capacitance of frequency converters and frequency converters. Background technique [0002] The bus capacitor of the inverter will gradually age with time, manifested as a decrease in capacitance, an increase in the leakage current of the capacitor, and an increase in the internal resistance of the capacitor. The final failure of the bus capacitor will cause the inverter to stop or even damage other components. Therefore, the aging of the capacitor can be judged by diagnosing the capacitance, leakage current or internal resistance of the bus capacitor, so as to avoid capacitor damage. [0003] During the implementation process, the inventors found at least the following problems in the traditional technology: using the bridge to measure the internal resistance of the capacitor to determine the aging of the capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R27/02H02M1/00H02M5/458
CPCG01R27/02G01R31/00H02M1/00H02M5/458
Inventor 郭志海郭威陈锦权
Owner HITACHI ELEVATOR CHINA
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