WSEAS Transactions on Circuits and Systems
Print ISSN: 1109-2734, E-ISSN: 2224-266X
Volume 14, 2015
Research on Two-channel Interleaved Two-stage Paralleled Buck DC-DC Converter for Plasma Cutting Power Supply
Authors: , , , , ,
Abstract: Buck DC-DC converter is an important and typical power electronic converter with relatively simple topology and rich study contents. Nowadays, it has been widely used as SMPS and high power DC power supplies. As for high power plasma cutting machine, multi-channel interleaved and multi-stage paralleled buck DC-DC converter is the first choice. When designed as a constant DC current supply, it is characteristic of high current precision, good stability and reliability, and it can be designed with current limitation, power equilibrium, constant switching frequency, zero output current steady-state error and phase shift driving. In the paper, a two-channel interleaved, two-stage paralleled buck DC-DC converter is analyzed and designed by using sliding mode control (SMC) and simulated by means of MATLAB/SIMULINK. The basic principle of sliding mode control is also reviewed. Then the experimental setup of plasma cutting machine (PCM) DC current supply is implemented on the basis of the theoretical analysis, which outputs the rated current of 260A and the rated DC voltage of 150V, and the switching frequency is selected as 10kHz. The gained results prove the designed sliding mode control.
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Keywords: Plasma cutting power supply, buck DC-DC converter, Two-channel interleaved, Two-stage paralleled, Sliding mode control, Current limitation, Constant switching frequency, Output voltage steady-state error, Phase shift driving
Pages: 261-274
WSEAS Transactions on Circuits and Systems, ISSN / E-ISSN: 1109-2734 / 2224-266X, Volume 14, 2015, Art. #31