4.8 Article

Linear-Nonlinear Optimal Step Control for 1-kV SiC LLC Converters With Pulse Loads

Journal

IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 36, Issue 10, Pages 12008-12018

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3070928

Keywords

Linear-nonlinear optimal step control; LLC converter; pulse load

Funding

  1. Industrial Prospective and Key Core Technology Funding of Jiangsu Province [BE2019113]

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The proposed linear-nonlinear step load control method achieves stable operation at full load within the minimum output voltage drop and settling time through nonlinear optimal step control.
The linear-nonlinear step load control is proposed to meet the requirements of the pulse load. The nonlinear optimal step control from absolute no-load to full-load is able to force the converter to reach the full-load steady-state operation point with the minimum output voltage drop and minimum settling time. The key is to calculate the initial switching frequency and the duty cycle of the first switching period depending on the load condition. The proposed method is realized by analytic geometry analysis on the state trajectory and confirmed in a 6.6-kW 1-kV/48-V SiC LLC converter. From no-load to full-load, the output voltage drops by 2.24 V and the settling time is 0.76 ms, which reduce by 18.8% and 79.3% compared with the conventional linear control, respectively. Under 100-Hz pulse load with the duty cycle of 30%, the output voltage drop is limited within 2.30 V and overshoot by 1.68 V.

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