Direct-current bus electrolytic capacitor life test method and device

A technology of electrolytic capacitors and DC bus bars, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., and can solve problems such as high cost and inaccurate predicted values ​​of electrolytic capacitors

Active Publication Date: 2014-03-26
HUAWEI DIGITAL POWER TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a DC bus electrolytic capacitor life detection method and device to overcome the problem that the predicted value of the electrolytic capacitor calculated by the prior art is not accurate and the cost is too high

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  • Direct-current bus electrolytic capacitor life test method and device
  • Direct-current bus electrolytic capacitor life test method and device
  • Direct-current bus electrolytic capacitor life test method and device

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Embodiment Construction

[0069] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0070] figure 1 It is a flow chart of an embodiment of the DC bus electrolytic capacitor life detection method of the present invention, as figure 1 As shown, the method of this embodiment may include:

[0071] Step 101, controlling the DC bus electrolytic capacitor to charge and / or discharge, and determining the relationship between the capacit...

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Abstract

An embodiment of the invention provides a direct-current bus electrolytic capacitor life test method and device. The method includes: controlling a direct-current bus electrolytic capacitor to charge and / or discharge, and determining the variation relation between capacitance of the direct-current bus electrolytic capacitor and time of charging and / or discharging process; determining a life value of the direct-current bus electrolytic capacitor according to a minimum capacitance that full-load output requires and the variation relation; according to the life value and a life prediction formula of the direct-current bus electrolytic capacitor, calculating operating temperature of the direct-current bus electrolytic capacitor; according to the calculated operating temperature and measured ambient temperature of the direct-current bus electrolytic capacitor, acquiring a temperature correction coefficient; using the temperature correction coefficient to correct the life prediction formula, and testing the life value of the direct-current bus electrolytic capacitor by the corrected life prediction formula. By correcting the electrolytic capacitor life prediction formula, the life of the electrolytic capacitor can be accurately predicted.

Description

technical field [0001] Embodiments of the present invention relate to power electronics technology, in particular to a method and device for detecting the life of an electrolytic capacitor of a DC bus. Background technique [0002] The development of power electronics technology has made uninterruptible power supply systems, frequency converters and other electrical equipment containing DC bus electrolytic capacitors widely used. Among them, the electrolytic capacitor is a key energy storage component, and its function is mainly to buffer the energy exchange between the grid side and the load, stabilize the bus voltage, and suppress the large fluctuation of the DC bus voltage caused by the sudden change of the load. [0003] In use, factors such as excessive voltage, excessive ripple current, and dry electrolyte will affect the life of electrolytic capacitors, thereby affecting the reliability of electrical equipment. Therefore, conventionally, an electrolytic capacitor and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 郭欢程洋刘培国
Owner HUAWEI DIGITAL POWER TECH CO LTD
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