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Second-order sliding mode control of three-level DC-DC buck converter and finite state machine realization method of control

A technology of finite state machine and second-order sliding mode, which is applied in the direction of adjusting electrical variables, control/regulation systems, and converting DC power input to DC power output, etc. Complicated, difficult flying capacitor voltage and other issues

Inactive Publication Date: 2015-08-26
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 control of three-level DC-DC buck converter and finite state machine realization method of control
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  • Second-order sliding mode control of three-level DC-DC buck converter and finite state machine realization method of control

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Embodiment Construction

[0059] 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.

[0060] In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships 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 ...

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Abstract

The invention discloses a second-order sliding mode control of three-level DC-DC buck converter and a finite state machine realization method of control. The method comprises the steps that S1) a mathematical model of the three-level DC-DC buck converter is established, the difference between the output amount and the reference value of the DC-DC buck converter is defined as a sliding mode amount, and a sliding mode dynamic equation is established and analyzed; S2)Thus, the the working mode of the converter is divided into four states, on the premise that the switching efficiency is highest and there is no output overshoot, a critical switching coefficient betamin is obtained via calculation; and S3) is implemented according to the critical switching coefficient betamin; and S3) a finite state machine controller of the second-order sliding mode control method is established, the obtained critical switching coefficient betamin is substituted into the finite state machine controller, and the tracking reference value of the output voltage of the three-level DC-DC buck converter is adjusted. Thus, advantages of the three-level DC-DC buck converter can be played.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a second-order sliding mode control of a three-level DC-DC buck converter and a method for realizing the finite state machine thereof. 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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