A control method of buck converter using dsp to realize second-order sliding mode control

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 problem of high accuracy, output voltage cannot be maintained, output voltage impact and other issues, to achieve good robustness, good anti-disturbance, and reduce switching loss

Inactive Publication Date: 2017-10-27
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 output voltage cannot maintain high accuracy, and parameter perturbations and external disturbances have a great impact on the output voltage. Impact

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  • A control method of buck converter using dsp to realize second-order sliding mode control
  • A control method of buck converter using dsp to realize second-order sliding mode control
  • A control method of buck converter using dsp to realize second-order sliding mode control

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Embodiment Construction

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0036] The sliding mode controller has a simple structure and is easy to implement. The main implementation methods include: 1. Designing an analog circuit through an operational amplifier and other components; 2. Designing an algorithm program through a DSP or a 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 parameter adjustment. In complex high-performance system applications with many controllable factors, multiple power supplies, and complex high-performance systems, the latter method is more widely used.

[0037] Such as figure 1 As shown, the Buck converter usi...

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Abstract

The invention proposes a Buck converter control method using DSP to realize second-order sliding mode control. The main circuit module includes a Buck converter, whose input end is connected to a DC power supply, and its output end can be connected to a load to supply power directly. The output voltage of the Buck converter is collected through the ADC module of the DSP chip. The output voltage acquisition module includes 2 high-precision resistors. The control module includes a DSP control chip. The drive circuit module includes a power field effect transistor drive circuit unit. The second-order sliding mode control algorithm is realized by DSP digital control. The advantage of the second-order sliding mode algorithm is that it not only has the characteristics of strong anti-disturbance ability of the traditional sliding mode, but also by adding a hysteresis loop, the switching frequency of the control variable will not be too high, thereby reducing the switching loss of the Buck converter. The invention is suitable for Buck converters with high requirements on output voltage disturbance resistance and low circuit energy consumption, and has the advantages of convenient parameter adjustment, flexible algorithm modification and the like.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a control method for a Buck converter in which DSP realizes second-order sliding mode control. Background technique [0002] In recent years, Buck converters have been widely used in vehicle 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 at present. The advantage of this method is that through the fixed switching frequency, it has less switching loss and has strong electromagnetic compatibility (EMI). [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 output voltage cannot maintain high accuracy, and parameter perturbations and external disturbances have a great impact on the output voltage. Impact. Contents of the invention [0004] The invention aims at over...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156
Inventor 丁世宏王加典马莉孙金林
Owner JIANGSU UNIV
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