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High-order switching power supply converter modeling method based on signal flow diagram method

A technology of signal flow diagram and switching power supply, which is applied in the direction of instruments, electrical digital data processing, CAD circuit design, etc., can solve complex mathematical operations, troublesome problems, etc., and achieve the effect of simple operation and no need for mathematical calculations

Active Publication Date: 2020-02-21
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

For the small-signal modeling of switching power converter topologies (such as BUCK, BOOST, BUCK-BOOST), the state-space average method, switching element average model method, and switch network average model method have been widely used, but for Sepic, Cuk, For high-order circuits such as Zeta, using the above method requires complex mathematical operations, which is particularly troublesome

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  • High-order switching power supply converter modeling method based on signal flow diagram method
  • High-order switching power supply converter modeling method based on signal flow diagram method
  • High-order switching power supply converter modeling method based on signal flow diagram method

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Embodiment Construction

[0026] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0027] Since the switching power supply converter uses nonlinear devices such as capacitors and inductors, it brings strong nonlinearity to the converter circuit system, and it is very complicated to directly establish a dynamic model of the converter circuit system. However, in the inductor current continuous mode, the switching power converter contains two linear subsystems - ON state and OFF state. The two subsystems are represented by the signal flow graph method, and then the signal flow graphs of the two subsystems are related to each other, and finally the replacement operation is performed to obtain the topology of the switching power converter (such as Sepic, Cuk, Zeta, etc.) Circuit) large-signal model and small-signal model.

[0028] Take the BUCK-BOOST converter as an example.

[0029] The circuit diagram of the BUCK-BOOST c...

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Abstract

The invention discloses a high-order switching power supply converter modeling method based on a signal flow diagram method. The method comprises: dividing a nonlinear converter circuit system into two linear subsystems (an ON state and an OFF state); then obtaining signal flow graphs of the two subsystems according to the flow direction and the form of the signals; associating the signal flow graphs of the two subsystems with each other; and finally, obtaining a large signal model and a small signal model of topologies (such as Sepic, Cuk, Zeta and other high-order circuits) of the switchingpower supply converter through replacement operation. The whole modeling process takes a signal flow graph as an operation object, is visual and concise, does not need complex mathematical calculation, is simple in operation, and lays a foundation for further circuit design.

Description

technical field [0001] The invention relates to a modeling method, in particular to a high-order switching power converter modeling method based on a signal flow diagram method, and belongs to the technical field of power electronics. Background technique [0002] DC-DC switching power supply has the advantages of high efficiency, high power density and high reliability, and has been widely used in communications, computers, industrial equipment, household appliances and other fields. For the small-signal modeling of switching power converter topologies (such as BUCK, BOOST, BUCK-BOOST), the state-space average method, switching element average model method, and switch network average model method have been widely used, but for Sepic, Cuk, For high-order circuits such as Zeta, complex mathematical operations are required to use the above methods, which is particularly troublesome. Contents of the invention [0003] In order to solve the deficiencies of the prior art, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/367G06F30/36
Inventor 宋久旭高鹏飞程为彬郭颖娜
Owner XI'AN PETROLEUM UNIVERSITY
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