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Capacitance detection equipment, method and device of a DC bus capacitor

A technology for DC bus capacitance and detection equipment, which is applied in the directions of measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc. It can solve the problems that the offline detection scheme is not applicable and the DC bus capacitor cannot be disassembled, etc., and achieve online Detection effect

Active Publication Date: 2019-04-02
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in many devices, the DC bus capacitor cannot be disassembled, and the offline detection scheme of the prior art is not applicable

Method used

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  • Capacitance detection equipment, method and device of a DC bus capacitor
  • Capacitance detection equipment, method and device of a DC bus capacitor
  • Capacitance detection equipment, method and device of a DC bus capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 of the present invention provides a device for detecting the capacitance of a DC bus capacitor, such as figure 2 As shown, it can include:

[0029] The voltage detection circuit 201 is used to obtain the ripple voltage of the specified frequency of the DC bus capacitor;

[0030] The current detection circuit 202 is used to obtain the ripple current of the specified frequency of the DC bus capacitor;

[0031] The processor 200 is configured to obtain the ripple voltage from the voltage detection circuit 201, obtain the ripple current from the current detection circuit 202, and determine the capacitance of the DC bus capacitor according to the ripple voltage, the ripple current, and the specified frequency. value.

[0032] There are switching tubes in switching power supply equipment and other equipment, such as figure 1 As shown, the switching ripple will be generated on the DC bus when the switch tube is turned on and off, so the DC bus capacitor must have ripple ...

Embodiment 2

[0085] Correspondingly, Embodiment 2 of the present invention provides a method for detecting the capacitance of a DC bus capacitor, such as Image 6 Shown, including:

[0086] Step 601: Obtain the ripple voltage of the designated frequency and the ripple current of the designated frequency of the DC bus capacitor;

[0087] Step 602: Determine the capacitance value of the DC bus capacitor according to the ripple voltage, the ripple current and the specified frequency.

[0088] Preferably, in another specific embodiment of the present invention, step 602 determines the capacitance value of the DC bus capacitor according to the ripple voltage, the ripple current and the specified frequency, including:

[0089] According to the ripple voltage and the ripple current, determine the reactive impedance of the DC bus capacitor; determine the capacitance of the DC bus capacitor according to the reactive impedance of the DC bus capacitor and the designated frequency.

[0090] Further, specificall...

Embodiment 3

[0103] Based on the same inventive concept, according to the method for detecting the capacitance of the DC bus capacitor provided in the above-mentioned embodiment 2 of the present invention, correspondingly, the embodiment 3 of the present invention also provides a device for detecting the capacitance of the DC bus capacitor. Figure 7 As shown, specifically including:

[0104] The obtaining unit 701 is configured to obtain the ripple voltage of the specified frequency and the ripple current of the specified frequency of the DC bus capacitor;

[0105] The determining unit 702 is configured to determine the capacitance value of the DC bus capacitor according to the ripple voltage, the ripple current and the designated frequency.

[0106] Preferably, the determining unit 702 is specifically configured to determine the reactive impedance of the DC bus capacitor based on the ripple voltage and the ripple current; determine the DC bus capacitor based on the reactive impedance of the DC b...

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PUM

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Abstract

The invention discloses a capacitance detection device, method and apparatus of a DC bus capacitor. The device, method and apparatus can achieve online detection of the capacitance of a DC bus capacitor. The device comprises: a voltage detection circuit for obtaining a ripple voltage of an assigned frequency of the DC bus capacitor; a current detection circuit for obtaining a ripple current of the assigned frequency of the DC bus capacitor; and a processor for obtaining the ripple voltage from the voltage detection circuit, obtaining the ripple current from the current detection circuit, and determining the capacitance of the DC bus capacitor according to the ripple voltage, the ripple current and the assigned frequency.

Description

Technical field [0001] The present invention relates to the technical field of power electronics, and in particular to a device, method and device for detecting the capacitance of a DC bus capacitor. Background technique [0002] Many current devices have DC bus capacitors used to stabilize the DC bus voltage, such as switching power supply devices. Switching power supply equipment mainly includes DC / DC conversion switching power supply equipment, DC / AC conversion switching power supply equipment, AC / DC conversion switching power supply equipment, figure 1 Shown is a DC / DC conversion switching power supply device, in which capacitive components C1 and C2 are DC bus capacitors. [0003] Due to manufacturing process and other reasons, the capacitance value of the capacitive device will change over time. If the capacitance value of the DC bus capacitor used for voltage stabilization in the device changes, it will inevitably affect the overall performance and service life of the devic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26
Inventor 黄杰标
Owner EMERSON NETWORK POWER CO LTD