DC-DC convertor stability analysis method based on describing function method

A DC-DC, description function method, applied in output power conversion devices, DC power input into DC power output, instruments, etc. Ignore the problem of strong nonlinearity in the switching process, and achieve the effects of high judgment accuracy, accurate results, and easy analysis process

Active Publication Date: 2015-04-29
BEIJING JIAOTONG UNIV
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Problems solved by technology

The above three methods ignore the strong nonlinearity of the switching process in the analysis and modeling process, and canno...

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  • DC-DC convertor stability analysis method based on describing function method
  • DC-DC convertor stability analysis method based on describing function method
  • DC-DC convertor stability analysis method based on describing function method

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Embodiment Construction

[0045] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0046] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicat...

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Abstract

The invention discloses a PWM type DC-DC convertor stability analysis method based on a describing function method. The stability analysis method includes the following steps that a PWM type DC-DC convertor is linearly modeled to obtain a linear model, a first transfer function and a second transfer function; the describing function method is adopted to carry out non-linear modeling on a non-linear link in the PWM type DC-DC convertor to obtain a first describing function; the second transfer function is replaced by the first describing function to obtain a non-linear model; according to the first transfer function, the first describing function and the non-linear model, the stability of the PWM type DC-DC convertor is analyzed. The PWM type DC-DC convertor stability analysis method can accurately analyze the critical stable state of the PWM type DC-DC convertor, an obtained result is more accurate than that obtained by a traditional linear analysis method, thus the low frequency oscillation phenomenon occurring in the PWM type DC-DC convertor can be analyzed, and the analysis accuracy is high.

Description

technical field [0001] The invention relates to the technical field of PWM (Pulse Width Modulation, pulse width modulation) type DC-DC converters, in particular to a stability analysis method for PWM type DC-DC converters based on a description function method. Background technique [0002] In today's engineering practice, the traditional linear analysis theory is mainly used for the analysis and modeling of PWM DC-DC converters, such as the state space averaging method, etc. It has strong nonlinear characteristics. Therefore, in the transition zone of the PWM DC-DC converter system from stable to unstable, the conclusion obtained by the traditional Nyquist stability analysis method does not match the actual situation, resulting in linear Sometimes the control strategy can't meet the performance index of the system very well. [0003] For example, at present, there are analytical methods for directly solving differential equations, phase plane methods, and switch signal flo...

Claims

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Application Information

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IPC IPC(8): H02M3/155
CPCH02M3/157
Inventor 李虹尚佳宁王诗姮游小杰郑琼林郝瑞祥杨中平孙湖
Owner BEIJING JIAOTONG UNIV
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