Switching converter EMI suppressing method based on chaotic signal drive
A switching converter, chaotic signal technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as poor control accuracy and interference suppression performance, inability to detect errors, and sensitivity to system parameter changes. The effect of application, wide range of use and simple realization method
Active Publication Date: 2017-11-28
GUANGZHOU UNIVERSITY
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Problems solved by technology
The open-loop control system cannot detect errors, nor can it correct errors. The control accuracy and interference suppression performance are poor, and it is very sensitive to changes in system parameters.
Therefore, it is generally only used in occasions that do not consider external influences, or where the inertia is small and the precision requirements are not high, and it does not meet the actual application requirements and the scene with high requirements for the environment and precision.
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[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0024] The suppression method of the present invention can be executed on various types of controllers, and this embodiment uses a single-chip microcomputer as an execution carrier to illustrate, and the suppression method can be used for various types of switching converters, including: AC-DC converters, DC-DC converter or AC-AC converter. In this embodiment, the flyback AC-DC converter is taken as an example to illustrate the specific steps and flow of the presen...
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The invention discloses a switching converter EMI (Electromagnetic Interference) suppressing method based on chaotic signal drive, including the following steps: acquiring a chaotic signal input by a user, and discretizing the chaotic signal to get discrete data; collecting a feedback voltage signal of a switching converter, and generating a chaotic PWM driving signal according to the discrete data and the feedback voltage signal, wherein the feedback voltage signal is used to change the duty radio of the chaotic PWM driving signal, and the discrete data is used to change the frequency of the chaotic PWM driving signal; and outputting the PWM driving signal to the switching converter in order to control the on-off state of the switching converter and to suppress the EMI of the switching converter. According to the embodiment of the invention, the frequency of the closed-loop switching converter is spread in a chaotic manner through the chaotic PWM driving signal to suppress EMI. The method is simple, accurate and widely used.
Description
technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an EMI suppression method for switching converters driven by chaotic signals. Background technique [0002] The electromagnetic interference (EMI) of the current switching converter is a difficult problem to solve, and the chaotic signal has the characteristics of continuous spectrum, which can make the EMI energy distributed in the frequency domain as evenly as possible, thereby reducing the energy peak of the EMI spectrum, so that The electromagnetic interference of the switching converter is suppressed. [0003] At present, the research on chaotic PWM suppressing EMI is basically just doing simulation research on a switching converter to obtain the simulated EMI spectrum, or conducting experimental research on chaotic suppressing EMI on an open-loop switching converter. The open-loop control system cannot detect errors, nor can it correct errors. The control accur...
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IPC IPC(8): H02M1/44
Inventor 杨汝刘佐濂王志燊李斌华胡嘉昕
Owner GUANGZHOU UNIVERSITY