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Finite time control method based on Buck converter current limitation

A converter control, limited time technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., can solve problems such as reducing efficiency and increasing cost, and achieves improved convergence speed and improved robustness. Effect

Active Publication Date: 2020-08-28
HEFEI UNIV OF TECH
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  • Application Information

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Problems solved by technology

Although the effect is significantly improved, this will not only increase the cost, but also reduce the efficiency

Method used

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  • Finite time control method based on Buck converter current limitation
  • Finite time control method based on Buck converter current limitation
  • Finite time control method based on Buck converter current limitation

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Embodiment Construction

[0038] A finite time control method based on Buck converter current limitation. The method is based on a controller such as figure 1 As shown, the method includes the following steps:

[0039] S1. Obtain the average mathematical model based on the DC-DC Buck converter, and obtain the state expression and error dynamic equation;

[0040] The resulting state space expression is:

[0041]

[0042]

[0043] Where V in Is the input voltage of the DC-DC Buck converter, V o Is the output voltage of the DC-DC Buck converter, Yes to V o Derivation, i L Is the inductor current of the DC-DC Buck converter, Yes i L Derivation, L, C, R are the inductance, capacitance and resistance of the DC-DC Buck converter, μ is the control input of the DC-DC Buck converter, and μ∈[0,1];

[0044] Define the input voltage error θ 1 =V ref -V o , Current error θ 2 =-i L +V ref / R,V ref For the reference reference output voltage, the dynamic error equation of the system is:

[0045]

[0046]

[0047] S2. Desig...

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Abstract

The invention relates to the technical field of power electronic control, and particularly relates to a finite time control method based on Buck converter current limitation. The method comprises thesteps of S1, obtaining an average mathematical model based on a DC-DC Buck converter, and obtaining a state expression and an error dynamic equation; S2, designing a current-limited finite time controller, and substituting the control input [mu] of the DC-DC Buck converter into the error dynamic equation; and S3, designing an adaptive current limited finite time controller. The method has the advantages that a finite time control algorithm is adopted, so that rapid tracking of the voltage can be realized, the convergence speed is increased, and the robustness of the system can be improved. Dueto the fact that current limitation is adopted, it can be guaranteed that the current is controlled within a certain range, and the circuit is protected against damage caused by overlarge current.

Description

Technical field [0001] The present invention relates to the technical field of power electronic control, in particular to a limited time control method based on Buck converter current limitation. Background technique [0002] DC Buck converter is an important power electronic device, which is widely used in uninterruptible power supplies, DC motor drives and other equipment, and requires optimal effective power conversion. At present, the DC-DC Buck converter is developing under high efficiency and high power density, and its application is more extensive. The introduction of various new topologies and the application of advanced control strategies will give DC-DC converters a better development prospect. [0003] Due to the need to quickly track the output voltage to the reference voltage, there may be an overcurrent problem in the circuit. Therefore, in order to restrict the current and prevent damage to the circuit components, some effective measures must be taken. The tradit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M3/156
CPCH02M1/32H02M3/156
Inventor 都海波杜庆秋王利楠俞波从永正
Owner HEFEI UNIV OF TECH