Buck converter control method achieving second-order sliding mode control by adopting DSP

A converter control and second-order sliding mode technology, which is applied in the control/regulation system, output power conversion device, DC power input conversion to DC power output, etc., can solve the problems of high accuracy, output voltage influence, and output voltage cannot Maintain and other issues, achieve good robustness, reduce switching loss, and good anti-disturbance effects

Inactive Publication Date: 2015-10-21
JIANGSU UNIV
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Problems solved by technology

[0003] However, since this is a control method based on a small-signal model design, when the Buck converter is disturbed by a large signal, the ou

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  • Buck converter control method achieving second-order sliding mode control by adopting DSP
  • Buck converter control method achieving second-order sliding mode control by adopting DSP
  • Buck converter control method achieving second-order sliding mode control by adopting DSP

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Embodiment Construction

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0036] The sliding mode controller has a simple structure and is easy to implement. Its main implementation methods include: 1. Design an analog circuit through components such as operational amplifiers; 2. Design an algorithm program through DSP or microcontroller (MCU). The former method is characterized by low cost, but the circuit is complicated, the loss is large, and the reliability is low. The latter method is characterized by low power consumption, strong reliability, flexible algorithm, and easy to adjust parameters. The latter method is more widely used in complex high-performance system applications with many controllable factors, managing multiple power supplies.

[0037] Such as figure 1 As shown, the Buck converter using DSP to implement the second-order sliding mode in...

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Abstract

The invention provides a Buck converter control method achieving second-order sliding mode control by adopting a DSP. The main circuit module comprises a Buck converter. The input end of the Buck converter is connected with a direct current source while the output end can be connected with a load for direct power supplying. The output voltage of the Buck converter is acquired by an ADC module of a DSP chip. An output voltage acquiring module comprises two high-precision resistors. A control module comprises a DSP control chip. The drive circuit module comprises an electric power field effect transistor drive circuit unit. A second-order sliding mode control algorithm is realized by DSP digital control. The second-order sliding mode control algorithm has the advantages of having strong conventional sliding mode disturbance rejection capabilities and lowering the switch loss of the Buck converter by making a control quantity switching frequency not excessively high by means of additional hysteresis control. The method is suitably used for the Buck converter having high output voltage disturbance rejection requirements and low circuit energy consumption. The method further has the advantages of parameter adjusting convenience, flexible algorithm modification, etc.

Description

Technical field [0001] The invention relates to the field of power electronics, and in particular to a Buck converter control method for implementing second-order sliding mode control by DSP. Background technique [0002] In recent years, Buck converters have been widely used in automotive power supplies, solar cells, medical equipment and other fields. The traditional pulse width modulation (PWM) control method is still the most widely used control method. The advantage of this method is that through a fixed switching frequency, the switching loss is small, and it has strong electromagnetic compatibility (EMI). [0003] However, because this is a control method based on a small signal model design, when the Buck converter is interfered by a large signal, the output voltage cannot maintain high accuracy, and parameter perturbation and external disturbances have a great impact on the output voltage. Impact. Summary of the invention [0004] The present invention aims to overcome t...

Claims

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Application Information

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IPC IPC(8): H02M3/156
Inventor 丁世宏王加典马莉孙金林
Owner JIANGSU UNIV
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