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LPV model based BOOST converter's robust variable gain controlling method

A control method and converter technology, applied in the control field, can solve the problems of structural parameter and performance change, deterioration of Boost converter output performance, etc.

Inactive Publication Date: 2016-08-31
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

In the actual production process, the structural parameters and performance of the boost converter will change due to device differences and aging, which will deviate from the mathematical model used in the design, resulting in the deterioration of the output performance of the boost converter

Method used

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  • LPV model based BOOST converter's robust variable gain controlling method
  • LPV model based BOOST converter's robust variable gain controlling method
  • LPV model based BOOST converter's robust variable gain controlling method

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Embodiment Construction

[0051] The specific embodiment of the present invention is described in detail in conjunction with accompanying drawing: as figure 1 Shown is the topology diagram of the Boost converter, we assume that the Boost converter works in continuous conduction (CCM) mode. figure 2 Shown is a fixed-frequency PWM waveform that turns the switch on and off. The constant switching frequency is 1 / T s , where T s is the switching period, which is equal to T on (when u=1) and T off (when u=0) sum. Duty cycle d is T on / (T on +T off ). The duty cycle is compared to a sawtooth signal with amplitude VM=1.

[0052] When the switch is closed there is:

[0053] When the switch is off:

[0054] The present invention is a kind of robust variable gain control method of Boost converter based on LPV model, such as image 3 The schematic diagram of the Boost converter LPV controller is shown in the following steps:

[0055] The first step: According to the state equation of the Boost ...

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Abstract

The invention discloses an LPV model based Boost converter's robust variable gain controlling method which is performed through the following steps: firstly introducing a linear parameter varying model for the Boost converter and polytope optimizing technologies; secondly, based on a linear matrix inequality (LMI) best optimizing method, using state feedback to configure a closed loop pole to a special zone meeting the requirement of dynamic responses; and with the consequence, designing a robust H controller for the Boost converter based on LPV. According to the invention, the designed LPV controller enables a Boost converter to maintain stable voltage output and good dynamic characteristics in conditions where sudden changes occur in load resistance or inputted voltage as well as where load disturbs current.

Description

technical field [0001] The invention relates to the technical field of control, in particular to a robust variable gain control method based on an LPV model Boost converter. Background technique [0002] Today, switching power supply technology is closely related to people's production and life. For a long time, in the field of power electronics, most switching converters use PID control strategy. However, it is difficult to select PID control parameters, and it is difficult to ensure that the system is optimal to meet the requirements of the converter's gradually improved dynamic response and control accuracy. [0003] With the continuous improvement of performance requirements for Boost converters, new breakthroughs have been made in the research on its control strategies in recent years. Some scholars proposed to introduce the idea of ​​stochastic optimization into the relevant research of Boost converters, and proposed to regard the nonlinear system model of the conver...

Claims

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Application Information

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IPC IPC(8): G05B17/02
CPCG05B17/02
Inventor 黄金杰潘晓真马龙振
Owner HARBIN UNIV OF SCI & TECH
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