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Robust control method and control system of direct-current buck converter and power converter

A DC step-down, robust control technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve problems such as inability to use, achieve a small amount of calculation, stable power supply voltage, and solve the busbar. Effects of Voltage Oscillation Problems

Inactive Publication Date: 2020-09-08
中国星网网络应用有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another example is that some literatures use the adaptive control method to solve the control problem in the Boost converter, but this method also needs to assume that the load resistance is an unknown value, which cannot be used in nonlinear load control problems

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  • Robust control method and control system of direct-current buck converter and power converter
  • Robust control method and control system of direct-current buck converter and power converter
  • Robust control method and control system of direct-current buck converter and power converter

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Embodiment Construction

[0032] 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.

[0033] 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 robust control method and control system of a direct-current buck converter, and a direct-current buck power converter. The method comprises the following steps: S1, acquiring voltage at two ends of a capacitor of a converter and current flowing through the inductor of the converter; S2, respectively calculating values z1(k) and z2(k) of error variables z1 and z2 at a moment k according to the obtained voltage and current; and S3, setting the duty ratio of the on-off control signal of the switching tube of the converter as an actual control variable u, obtaining the value u(k) of the actual control variable u at the moment k, setting the duty ratio of the on-off control signal of the switching tube of the converter as u(k), and returning to S1. According to the invention, the control method can effectively solve the problem of bus voltage oscillation caused by non-linear change of the load so as to stabilize the power supply voltage, the calculated amount is small, the algorithm is simple and easy to understand, robust control is achieved through the combination of the first inequality and the second inequality and the backstepping method, items needing tobe amplified are amplified slightly, and output oscillation is small.

Description

technical field [0001] The invention relates to a control method for a DC power converter, in particular to a robust control method for a DC step-down converter, a control system and a DC step-down power converter. Background technique [0002] A power electronic system usually includes multiple subsystems, and each subsystem is equipped with a power supply unit. For example, during the operation of a low-orbit satellite, the power supply units of each subsystem generally obtain power from the main power supply. Different subsystems may have different voltage requirements, and most of these subsystems need to step down the DC power supply. In actual situations, the loads carried by each subsystem change non-linearly, and the change of the load will cause DC The fluctuation of the buck converter output will cause harm to the system. Therefore, in these power electronic systems, a stable and reliable voltage supply is essential for their safe operation. DC-DC switching power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156
CPCH02M3/156
Inventor 陈俊兴郑伟王艳峰刘鸿鹏谷林海
Owner 中国星网网络应用有限公司
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