Buck-type loss tangent value monitoring method and system for output capacitor of DC/DC converter

A technology of loss tangent and output capacitance, which is applied in the direction of dielectric property measurement, instruments, measuring devices, etc., can solve the problems of complicated identification process and unable to provide capacitance health monitoring method, and achieve the effect of simple circuit

Active Publication Date: 2018-08-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, the existing buck-type direct-to-direct converter output capacitor health monitoring mostly focuses on the online identification of ESR and C, the identification process is complicated, and it is necessary to judge the discontinuous current mode (DCM) and continuous current mode (CCM) mode, Therefore, it is impossible to provide a relatively simple and general capacitor health monitoring method

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  • Buck-type loss tangent value monitoring method and system for output capacitor of DC/DC converter
  • Buck-type loss tangent value monitoring method and system for output capacitor of DC/DC converter
  • Buck-type loss tangent value monitoring method and system for output capacitor of DC/DC converter

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Embodiment Construction

[0017] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] Such as figure 1 As shown, the method of the present invention is applied to a Buck direct-to-direct converter system, and the system includes a high-pass filter unit, which can be a passive filter composed of a resistor, an inductance, and a capacitor, or can be composed of an operational amplifier , resistors, capacitors constitute the active filter.

[0019] In the system of this embodiment, the monitoring system includes a Buck direct-to-direct converter, a voltage sensor, a current sensor, and a computing unit; the Buck converter includes a diode, an inductor, and a load; o , the output of the voltage sensor is connected to the high-pass filter unit; the inductor is connected in series with the current sensor to obtain the inductor current i Lf , the output of the current sensor is connected to the high-...

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Abstract

The invention discloses a Buck-type loss tangent value monitoring method and system for an output capacitor of a DC/DC converter. The method includes steps of 1, enabling inductance current iLf and output voltage vo to pass through a high-pass filtering unit so as to acquire AC components; 2, calculating a cross correlation coefficient according to the acquired inductance current AC component iLf_ac and the output voltage AC component vo_ac; 3, estimating the loss tangent value tan Delta of the capacitor according to the cross correlation coefficient obtained through calculation. The method provided by the invention does not need external sampling points and does not influence normal working of the converter, and is simple and easy in implementation, and provides a basis for health monitoring of the capacitor.

Description

technical field [0001] The invention relates to a method for monitoring the health of an output capacitor of a Buck type direct-to-direct converter, in particular to an on-line monitoring method for a loss tangent value of an output capacitor. Background technique [0002] Due to the advantages of high efficiency, small size, and low noise, power electronic converters have been widely used in military, aerospace, and industrial fields. In power electronic converters, in order to obtain higher quality output voltage, capacitors must be used to filter out high-frequency noise, among which electrolytic capacitors are most commonly used. According to surveys, electrolytic capacitors are power devices with the highest failure rate in power electronic converters. After the electrolytic capacitor is used for a period of time, the equivalent series resistance ESR of the capacitor will increase, and the capacitance C of the capacitor will decrease. When the two changes to a certain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
CPCG01R27/2694
Inventor 任磊龚春英姚鑫荀本鑫高璐
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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