Method and circuit for online monitoring capacity state of bus capacitor

A technology of bus capacitance and capacitance capacity, which is applied in the direction of measuring electrical variables, measuring resistance/reactance/impedance, measuring devices, etc., and can solve problems such as low accuracy, high requirements for maintenance personnel, and high price

Active Publication Date: 2012-06-13
BEIJING DINGHAN TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Bus capacitors are generally high-voltage and large-capacity electrolytic capacitors, which are expensive, and the cost of regular replacement is high. In addition, testing equipment is required, which requires high maintenance personnel. In addition, manual testing has low efficiency and low accuracy. Timely replacement, there is a greater safety hazard

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  • Method and circuit for online monitoring capacity state of bus capacitor
  • Method and circuit for online monitoring capacity state of bus capacitor
  • Method and circuit for online monitoring capacity state of bus capacitor

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Embodiment Construction

[0030] The technical principle of the present invention: the bus capacitor C mainly plays the role of energy storage and filtering. The present invention uses the resources of the power electronic product itself to detect the real-time value I of the capacitor current in the charging and discharging process of the bus capacitor in real time. c and capacitor voltage real-time value U c , the bus capacitance C is the capacitance current I c , capacitor voltage U c And the function of time t, the capacitor capacity is estimated according to a certain functional relationship, and the state of the bus capacitor capacity can be monitored online in real time according to whether the capacitor value is within the normal upper and lower limits of the capacitor capacity. According to the working principles such as 1-1 and 1-2, we can abstract the basic circuit of capacitor charging and discharging as Figure 1-3 , the principle works as follows, the DC power supply is connected to the...

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Abstract

The invention discloses a method for online monitoring the capacity state of a bus capacitor. According to the method, a capacitor current real-time value ic and a capacitor voltage real-time value Uc of the bus capacitor in the charge / discharge process are detected in real time; as the bus capacitor C is a function of the capacitor current ic, the capacitor voltage Uc and time t, the capacitor capacity is estimated according to the functional relationship; and the capacity state of the bus capacitor is monitored online by judging whether the estimated value of the capacitor capacity is normal. The method can discover the performance drop of the capacitor and possible failure caused by the performance drop in time and does not require forced regular replacement of the bus capacitor, thereby reducing the maintenance cost; and moreover, as the method does not have low requirement on the maintenance personnel, the maintenance cost and the technical difficulty in maintenance are reduced.

Description

technical field [0001] The invention relates to a detection circuit of bus capacitance, in particular to a method and circuit for on-line monitoring of the state of bus capacitance. Background technique [0002] A capacitor is a component that can store charges, and it is also one of the most commonly used electronic components. In the field of power electronics technology, capacitors are used in almost all power electronic circuits. Such as Picture 1-1 with Figure 1-2 As shown in the circuit of , the role played by the capacitor in the circuit is the basic charge and discharge function. by Picture 1-1 For example, first the soft start switch K2 is closed, the input switch K1 is opened, the input voltage Us charges the bus capacitor C through K2 and the soft start resistor R, and when the bus capacitor Uc reaches a certain value, the input switch K1 is closed to complete the soft start of the bus capacitor. Boot process. Figure 1-2 In the circuit, first the soft start...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
Inventor 刘代兵
Owner BEIJING DINGHAN TECH GRP CO LTD
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