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Detection device for capacitor voltage imbalance of direct-current link

A capacitance voltage and detection device technology, which is applied in the direction of measuring devices, capacitance measurement, capacitor testing, etc., can solve the problems of high cost, component damage, and low benefit

Pending Publication Date: 2021-12-07
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, once the corresponding first DC voltage V 1 or the second DC voltage V 2 If any of the capacitors is open or short circuited, its voltage will be across other components that are still working normally, causing problems such as damage to the normal components
In order to solve this problem, the current technology mainly uses the voltage feedback detection of each capacitor to judge whether the voltage abnormality occurs, but this method is costly and causes an increase in uncertain factors in the feedback control. Furthermore, when the number of capacitors in series increases , the less effective the current technology will be

Method used

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  • Detection device for capacitor voltage imbalance of direct-current link
  • Detection device for capacitor voltage imbalance of direct-current link
  • Detection device for capacitor voltage imbalance of direct-current link

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Embodiment Construction

[0061] The technical content and detailed description of the present invention are described as follows in conjunction with the accompanying drawings.

[0062] See image 3 As shown, it is a circuit block diagram of the detection device for DC link capacitor voltage unbalance of the present invention. At the DC link of the AC / DC converter, in order to detect the first DC voltage V 1 with the second DC voltage V 2 If an unbalanced situation occurs, therefore, providing a sense resistor R S1 , R S2 as a detection. where the sense resistor R S1 One end is coupled to two capacitors C 11 ,C 12 common contact point, the sense resistor R S1 The other end is coupled with two balancing resistors R 11 , R 12 common contact point. Sense resistor R S2 One end is coupled to two capacitors C 21 ,C 22 common contact point, the sense resistor R S2 The other end is coupled with two balancing resistors R 21 , R 22 common contact point.

[0063] Sense resistor R S1 , R S2 As ...

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Abstract

A detection device for capacitor voltage imbalance of a direct-current link is provided, the direct-current link provides a direct-current voltage, comprises a plurality of capacitors coupled in series to both ends of the direct-current link, and a plurality of balancing resistors coupled in series to both ends of the direct-current link and respectively corresponding to the plurality of capacitors. The detection device comprises a plurality of detection resistors and a current detector. One end of each detection resistor is coupled with a common connection point of the two capacitors, and the other end of each detection resistor is coupled with a common connection point of the two balance resistors. The current detector is coupled with one of the plurality of detection resistors and is used for detecting a current value flowing through the corresponding detection resistor.

Description

technical field [0001] The invention relates to a detection device for capacitor voltage, in particular to a detection device for unbalanced DC link capacitor voltage. Background technique [0002] See Figure 1A and Figure 1B As shown, they are circuit block diagrams of DC link capacitor voltage distribution for existing single-phase AC voltage conversion and circuit block diagrams of DC link capacitor voltage distribution for existing three-phase AC voltage conversion. Taking DC link capacitor voltage distribution for single-phase AC voltage conversion as an example, the AC voltage V AC It is converted by an AC / DC converter (for example, but not limited to a three-level converter) to have a first DC voltage V on the DC link (DC link). 1 with the second DC voltage V 2 , or its DC link voltage is converted into an AC voltage V by an AC / DC converter AC . where the first DC voltage V 1 (across the first capacitor C 11 on) and the second DC voltage V 2 (across the seco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/16G01R19/00
CPCG01R29/16G01R19/0092G01R31/64H02M1/0009G01R19/22G01R27/2605H02M1/00H02M7/02H03F3/45H03F2200/462
Inventor 杨里庆黄文隆李圣华
Owner DELTA ELECTRONICS INC