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A new modeling of IGBT and Freewheeling diode based on electrical behavioral with independently of time condition

Boonpeang Worawut, Santalunai Samran, Thosdeekoraphat Thanaset, Thongsopa Chanchai

Przegląd Elektrotechniczny

2020

R. 96, nr 8

10--15

Several IGBT model proposed and constructed over the past years have exposed different essential qualities. However, in this paper, a new model of IGBT and Freewheeling diode based on electrical behavior is presented. The proposed parameters extraction process adopts the least squares regression and bilinear interpolation and, a two-level capacitance technique. and the model’s structure solely consists of fundamental components. In addition, the proposed model validates its simplicity for parameters extraction process, and its user-friendly application for a circuit topology of fundamental components. Some key factors of our proposed model are; independent time constraint, implementation flexibility, easily application by different topologies. These enumerated factors reinforce the reliability and suitability of our proposed model for a circuit simulation and optimization. The verification of our proposed model was steered with the use of an experimental circuit that consists of commercial components. Lastly, our simulation results showed a pattern of consistency with the experimental results.

W artykule opisano nowy model IGBT wykorzystujący diodę ruchu swobodnego (freewheeling diode).Model opiera się na niezależnym, ograniczeniu czasu, elastyczności zastosowania I łatwym zastosowaniu w różnych topologiach. Przeprowadzono symulację i optymalizację modelu. Wyniki zweryfikowano eksperymentalnie.

Optical image encryption by using diffractive imaging with special constraint in the input plane

Wang Z., Wang H., Yang X., Zhang P., Hou C., Qin Y.

Optica Applicata

2016

Vol. 46, nr 1

57--69

In order to simplify the optical setup and the encryption process, a diffractive-imaging-based optical encryption system using a single diffraction pattern is proposed. A predesigned binary mask is placed before the plaintext in the encryption process, and three randomly distributed phase only masks are placed in the optical path. Only one diffraction pattern needs to be recorded as ciphertext by CCD. In the decryption process, an iterative phase retrieval algorithm is applied, in which the predesigned binary mask acts as a support constraint in the input plane. After the iterative process, an interpolation operation for the zero-valued pixels is also implemented. The effectiveness and robustness of the proposal are demonstrated by numerical simulation results.