Control method of switching converter with right half plane zero point

Abstract

The invention relates to the field of control methods for switching converters, and specifically relates to a control method of a switching converter with a right half plane zero point. The inventionprovides a method for restraining negative regulation voltage aimed at problems of poor transient performance of a switching converter with a right half plane zero point, negative regulation of outputvoltage, and inapplicability of a conventional frequency domain method. A theoretical support that the right half plane zero point can be neglected under certain conditions is given. Steps of a frequency domain method of the switching converter with the right half plane zero is provided, and a Boost converter is used as an example to perform syste / m analysis. The control method has clear design ideas and high feasibility. The method has important significance and practical value for design of a switching converter system with a right half plane zero point.

Description

Technical field [0001] The present invention relates to the field of control methods of switching converters, in particular to a control method of switching converters with a right half-plane zero point. Background technique [0002] In recent years, as the energy crisis has become increasingly prominent, new energy technologies such as photovoltaics and fuel cells have become current research hotspots. In these systems, switching DC-DC converters that can achieve boost or buck functions are required. Among these switching DC-DC converters, Buck converters and their derivative topologies are minimum phase systems, while Boost, Buck-Boost, Cuk, Zeta, Sepic and their derivative topologies are all non-minimum phase systems, which manifest themselves as control variables to output The transient mathematical model of voltage contains zeros on the right half plane. When the right half-plane zero point will increase (or decrease) the duty cycle of this type of converter, the correspon...

AI Technical Summary

Problems solved by technology

When designing a switching DC-DC converter with a right-half-plane zero point, the open-loop transfer function of the system cannot use the amplitude margin and phase angle margin to measure the controller design effect, so the traditional frequency domain method cannot Use directly

Therefore, the traditional PI and PID controllers only control the output voltage or other variables by dynamically adjusting the duty cycle of the converter according to the error of the control variable. The control effect is poor, and good transient and steady state cannot be obtained. performance

Due to the existence of the right half plane zero point, conventional nonlinear control strategies such as sliding mode variable structure, passive control, adaptive control, etc. cannot be directly applied, and the controller design becomes complicated

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