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A Boost converter large signal modeling method

A modeling method and converter technology, which can be used in instruments, special data processing applications, electrical digital data processing, etc.

Active Publication Date: 2019-05-28
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the calculation of the model is complex, and it needs to deal with the product and integral of multiple matrix exponential functions. Generally, the numerical results can only be obtained through computer-aided analysis, which is not intuitive enough, and it is difficult to use in engineering practice.

Method used

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  • A Boost converter large signal modeling method
  • A Boost converter large signal modeling method
  • A Boost converter large signal modeling method

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited by this.

[0026] The circuit structure and modulator time domain waveform are as follows figure 1 and figure 2 shown. The converter parameters are as follows: L s = 100μH, C s = 300μF, f s = 50kHz,k p =0.02,k i = 2, V ref =48V, V i = 20V, R L = 50Ω, R es = 55mΩ.

[0027] The converter state matrix is ​​as follows:

[0028]

[0029]

[0030] Its state variable contains the flow through the inductor L s current and the output capacitance C o The voltage across the two ends, that is, x=[i L v o ] T .

[0031] G(d) and H(d) can be expressed as

[0032]

[0033] The state matrix obtained by the average switch model satisfies the constraints of the equivalence criterion, namely

[0034]

[0035] Among them, G=[g i,j ], G eq,cov =[g eq,cov,i,j ].

[0036...

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Abstract

The invention discloses a Boost converter large signal modeling method. Constraint conditions during modeling are increased, a large signal modeling method based on joint constraint of the state matrix and the input matrix is provided, and the large signal modeling method is suitable for large signal modeling of Boost converters adopting different modulation modes. The large signal model of the Boost circuit is more accurate and is not limited by a modulation mode, so that subsequent equivalent circuit derivation is facilitated.

Description

technical field [0001] The invention relates to a DC / DC converter, in particular to a Boost converter. Background technique [0002] The DC / DC converter realizes the power conversion between the input and output by controlling the on-off of the switching device, and the driving signal of the switching device is generated by the modulation link. In order to make the converter system achieve the required dynamic and static indicators, it is generally necessary to introduce a feedback mechanism. The modeling of the converter is very important for its controller design. [0003] Among many converter modeling methods, the State-space Averaging (SSA) model is the most widely used. By performing weighted average processing on the state matrix and input matrix of the state equation of each switching stage of the converter, the SSA modeling method It can not only obtain the transfer function reflecting the small-signal characteristics of the converter, but also establish the corres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 杭丽君童安平邵持何远彬李国文廖嘉瑞
Owner HANGZHOU DIANZI UNIV
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