Researching the efficiency of buck converter synchronous rectifier

Authors

DOI:

https://doi.org/10.15587/2706-5448.2020.207893

Keywords:

buck converter, digital control, buck converter losses, buck-converter efficiency, synchronous rectifier.

Abstract

The object of study is synchronous buck-voltage converter with digital control system. One of the most problematic things is energy changing and transmission in converters to reach certain numerical range with minimal losses in the components of the electrical circuit. An enormous calculated parameters of electrical scheme. There was advised and described both structure and electrical scheme of synchronous converter, which, thanks to digital system, provides dates with more accuracy connected with an impact on working scheme. There was shown detailed analysis example with a numerical value for the certain elements of electrical scheme. It’s a fundament in order to choose certain parts of electrical scheme according to the certain categories.

During research there was used selection of hardware and software tools: elements for buck-converter – key, diode and capacitor; certain voltage and frequency range for microcontroller; control of the power keys of the circuit with the corresponding operating parameters for driver. There was analyzed and calculated all over the possible losses during the process bucking of the voltage to the certain level, an enormous losses in the components of the converter electrical scheme – induction coil, keys and capacitors. It’s an important part of synchronous buck-converter. There was calculated power losses and efficiency through the received graphics of keys commutation in electrical scheme. There were received graphic dependence of converter efficiency on output power; time characteristics of the control signal pulse-width modulation (PWM) and output voltage; dependence on the commutation losses. This is because advised synchronous converter has a set of features. Particularly analog to digital converter in the capacity of feedback, digital regulation system with a discrete step and rectification by replacing diodes with actively controlled switches. There are keys of low-side and high-side levels according to the passing voltage and current values. Therewith provides possibility for receiving more accuracy value. In comparison with analogic buck-converters, this converter has voltage parameter with fractional error.

Author Biography

Yehor Zheliazkov, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», 37, Peremohy ave., Kyiv, Ukraine, 03056

Department of Electronic Devices and Systems

References

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Published

2020-08-31

How to Cite

Zheliazkov, Y. (2020). Researching the efficiency of buck converter synchronous rectifier. Technology Audit and Production Reserves, 4(1(54), 44–50. https://doi.org/10.15587/2706-5448.2020.207893

Issue

Vol. 4 No. 1(54) (2020): Industrial and technology systems

Section

Reports on research projects

License

Copyright (c) 2020 Yehor Zheliazkov

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