Method for extracting stray inductance of converter based on weighted least squares

A technology of weighted least squares and stray inductance, applied in instruments, electrical components, electronic switches, etc., can solve problems such as large calculation errors

Inactive Publication Date: 2018-11-20
HENAN POLYTECHNIC UNIV
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Problems solved by technology

[0005] Aiming at the problem of large calculation errors caused by difficult and accurate extraction in the indirect measurement method, the present invention provides a method for extracting stray inductance of a converter based on weighted least squares, which analyzes the circuit structure of the layout at both ends of the capacitor, An optimization method for fitting and calculating current i(t) points by weighted least square method is proposed, and the total stray inductance of the loop is calculated by seeking the voltage overshoot value corresponding to the optimal point

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  • Method for extracting stray inductance of converter based on weighted least squares
  • Method for extracting stray inductance of converter based on weighted least squares
  • Method for extracting stray inductance of converter based on weighted least squares

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[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work, any modifications, equivalent substitutions, improvements, etc., shall be included in the protection scope of the present invention Inside.

[0040] A method for optimizing the stray inductance of a converter based on weighted least squares, such as figure 1 As shown, the optimization method adopts a circuit with a capacitor side-by-side layout to optimize the total stray inductance of the circuit during the turn-off process of the insulated gate bipolar transistor IGBT, such as figure 2 As shown, the steps o...

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Abstract

The invention discloses an optimization method of stray inductance of a converter based on weighted least squares. According to the method, based on the layout of topological structures at two sides of a capacitor, point taking and fitting are carried out on a current ic waveform and a waveform of voltage UM of an IGBT in a switch-off process by using a weighted least squares method, the stray inductance is extracted and optimized and analyzed through MATLAB programming, according to the method, simulation and experimental analysis show that an error can be reduced, the accuracy of a stray inductance value can be improved, and the method has certain guiding significance for the structural optimization of a power converter laminated busbar.

Description

Technical field [0001] The invention belongs to the technical field of power electronic control, in particular to a method for extracting stray inductance of a converter based on weighted least squares. Background technique [0002] With the development of society and economy, there are more and more researches and applications of large-capacity power converters based on power electronic devices. At present, insulated gate bipolar transistor IGBT has become a widely used switching device under commercialization, and its voltage level It can reach 6500V, the current level can reach 3600A, the switching time is about 0.2us, and it has a high current change rate di / dt. Under the combined action of higher di / dt and line stray inductance, IGBT will withstand relatively high voltage spikes during the turn-off process, which increases the electrical stress, switching loss and electromagnetic interference of the switching device, and the line stray inductance The existence of will chang...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50H03K17/567
CPCH03K17/567G06F30/367
Inventor 朱艺锋张国澎杨明陶海军李冰峰毛克春
Owner HENAN POLYTECHNIC UNIV
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