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Second-order sliding mode controller and flying capacitor voltage balance method of three-level DC-DC buck converter

A flying capacitor, second-order sliding mode technology, applied in the field of second-order sliding mode controller and flying capacitor voltage balance, can solve the problem of the large number of switches of three-level DC-DC buck converter, the difficulty of flying capacitor voltage, and the difficulty in controlling the voltage of the flying capacitor. complex issues

Inactive Publication Date: 2015-09-09
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the three-level DC-DC buck converter has a large number of switches, and the control is complicated, and the control of the flying capacitor voltage is even more difficult to control.
Although the traditional buck converter is controlled by the second-order sliding mode control method in the prior art, for the three-level DC-DC buck converter, the second-order sliding mode control method can be used to adjust the output voltage while balancing the flying step The technology of capacitive voltage is still blank, which urgently needs those skilled in the art to solve corresponding technical problems

Method used

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  • Second-order sliding mode controller and flying capacitor voltage balance method of three-level DC-DC buck converter
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  • Second-order sliding mode controller and flying capacitor voltage balance method of three-level DC-DC buck converter

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Embodiment Construction

[0050] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0051] In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or elem...

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Abstract

The invention discloses a second-order sliding mode controller and flying capacitor voltage balance method of a three-level DC-DC buck converter. The method is characterized by including the following steps: S1, establishing a second-order sliding mode control method limit state machine controller, and substituting a critical switching coefficient [beta]min obtained by calculation to a second-order sliding mode controller; and S2, the second-order sliding mode controller performing balance control over flying capacitor voltages, and solving the range of load currents without increases of switch loss of switch tubes. The invention brings forward a novel limit state machine controller structure of a second-order sliding mode control method. The controller can adjust output voltage tracking reference values, balance flying capacitor voltages to be half of input voltage values, bring the advantages of the three-level DC-DC buck converter into full play relative to a conventional buck converter. As for the second-order sliding mode control method adopted by the invention, current detection is not needed, and the method has the characteristics of non-overshoot during a starting process, quick dynamic response speed and high disturbance resistance.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a second-order sliding mode controller of a three-level DC-DC buck converter and a method for balancing voltages of flying capacitors. Background technique [0002] Compared with the traditional buck converter, the three-level DC-DC buck converter has many advantages: the voltage stress of the switching tube is halved, the pulsating frequency of the inductor current is increased to twice the switching frequency, the size of the inductor is reduced, and the energy efficiency is improved. However, the three-level DC-DC buck converter has a large number of switches and complex control, and the control of the flying capacitor voltage is even more difficult. Although the traditional buck converter is controlled by the second-order sliding mode control method in the prior art, for the three-level DC-DC buck converter, the second-order sliding mode control method can be used to adjust t...

Claims

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Application Information

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IPC IPC(8): H02M3/156
Inventor 凌睿舒志辉朱哲人王理智严小东黄雪莉余大侠刘辉
Owner CHONGQING UNIV
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