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Small signal modeling method for CLLLC resonant circuit

A technology of resonant circuit and modeling method, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., and can solve complex and low-accuracy problems

Pending Publication Date: 2022-02-11
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a small-signal modeling method for a CLLLC resonant circuit in view of the current mainstream models with low accuracy or complex solutions

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  • Small signal modeling method for CLLLC resonant circuit
  • Small signal modeling method for CLLLC resonant circuit
  • Small signal modeling method for CLLLC resonant circuit

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Embodiment Construction

[0043] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention.

[0044] The embodiment of the present invention establishes a large-signal equivalent model of a CLLLC circuit based on Kirchhoff's voltage and current law combined with PFM modulation mode by performing equivalent transformation and approximation of the output load on the basis of the modal analysis of the circuit. Fully considering the influence of the switching frequency on the output equivalent load, the S-domain small-signal model of the system is deduced by means of the exte...

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Abstract

The invention discloses a small-signal modeling method for a CLLLC resonant circuit, and the method comprises the steps: carrying out the modal analysis of a circuit, building a topological nonlinear state equation in combination with a circuit principle, converting a nonlinear quantity into a coupled linear quantity through an extended description function method, and obtaining a state-space equation reflecting the characteristics of the circuit. Through accurate approximate simplification and equivalence of variables, an accurate steady-state value can be obtained. The deduced large-signal equivalent model and S-domain small-signal model are utilized to research the influence of the CLLLC system under the PFM, and the essence of the action of circuit parameters and input control quantity on the system is revealed. Therefore, a new thought is provided for related research work such as control and stability analysis of the CLLLC circuit in the PFM mode.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a small-signal modeling method for a CLLLC resonant circuit. Background technique [0002] With the rapid development of new energy vehicles, DC microgrids and energy storage industries, isolated bidirectional DC-DC converters have been widely researched and applied. CLLLC resonant converter has natural soft switching characteristics, and its control algorithm is simple, high power transmission efficiency, high power and other characteristics have become research hotspots in recent years. [0003] For the CLLLC resonant topology, the fundamental approximation (First Harmonic Approximation, FHA) method has gradually become its main modeling method, which approximates the input and output voltages of the resonator as its fundamental component, and converts the analysis of the topology to the sinusoidal Analysis of steady-state circuits. However, the disadvantage of the FHA...

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Application Information

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IPC IPC(8): G06F30/398
CPCG06F30/398
Inventor 詹昕明杭丽君何远彬何震曾平良
Owner HANGZHOU DIANZI UNIV
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