Multi-phase DCDC robust controller design method

Abstract

The invention relates to a multi-phase DCDC controller design method. The method is based on a generalized multi-phase DCDC boost converter model, adopts independent control modes of all groups, comprehensively analyzes parameter uncertainty, system interference input and quadratic nonlinearity of a linear model, and establishes a robust control model of a multi-phase boost converter. The model is suitable for various circuit topologies such as single-phase boost, typical magnetic integration multi-phase boost and coupling inductance multi-phase boost, fully considers parameter uncertainty, interference input and quadratic nonlinearity, and has very high applicability and good robust stability and robust performance. A robust controller designed through the method has the advantages of being good in stability and insensitive to bounded uncertainty and interference, the system stability and transient performance requirements of a large-power multi-phase DCDC converter in a wide working range are met, and the design problem of a multi-phase staggered DCDC controller is solved.

Description

technical field [0001] The invention relates to a design method of a multiphase DCDC controller, which can be used in the field of power electronic equipment. Background technique [0002] The multi-phase DC-DC converter adopts a multi-phase parallel topology and uses multiple groups of devices to achieve the design goal. While breaking through the power limit of a single device, it also effectively reduces the demand for capacitance and inductance, thereby improving power density. . In addition, lower output ripple, more controllable objects and design margins improve the control flexibility and working reliability of the DC converter. [0003] Although the multi-phase DC-DC converter has the characteristics of high power, high power density, flexible control and high reliability, its structure is complex and there are many devices, and due to the problems of circuit stray parameters and phase asymmetry, it is difficult to accurately model very difficult. Moreover, the p...

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Problems solved by technology

[0003] Although the multi-phase DC-DC converter has the characteristics of high power, high power density, flexible control and high reliability, its structure is complex and there are many devices, and due to the problems of circuit stray parameters and phase asymmetry, it is difficult to accurately model very difficult

Moreover, the parameter uncertainty and quadratic nonlinearity of the multiphase DC-DC converter affect the stability and reliability of the control. Commonly used control methods such as PID control, sliding mode control, and pole configuration cannot effectively deal with the variable parameters of the system. deterministic, and in the design, for the convenience of processing, the quadratic nonlinearity is often ignored

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