Destructive oscillations in low inductance diode circuit

Optimal Rc Protection of Thyristors

“…OgraniËenje brzine porasta napona [1] i ograni-Ëenje prenapona oporavka tiristora [2] postiaee se pomoÊu RC sklopa koji se dodaje paralelno tiristoru, a ograniËenje brzine porasta struje [3] i [4] postiaee se dodavanjem induktiviteta u seriju s tiristorom. Na taj naËin se postiaee tzv.…”

“…U prvoj grupi radova tiristor se tretira kao idealna sklopka [5], a u drugoj grupi tiristor se nadomjeπta sa strujnim izvorom, Ëija struja eksponencijalno pada [6]. U radovima [1], [2], [3], [4], [7], [8] i [9] pri analizi navedenih pojava, tiristor je nadomjeπten paralelnim RC sklopom, ali bez zaπtitnog RC sklopa, dok je u radu [3] pri analizi RC zaπtite tiristor nadomjeπten nelinearnim otporom. U ovom radu analizira se naponska i strujna zaπtita tiristora, pri Ëemu je tiristor nadomjeπten paralelnim RC sklopom.…”

“…Limitation of the voltage increase rate [1] and of the thyristor recovery overvoltage [2] is achieved by an RC circuit which is added parallel to the thyristor, while limitation of the current increase rate [3] and [4] is performed by adding the inductance serially to the thyristor. In this way, the so called RC protection and L protection are realized.…”

“…In the fi rst group, the thyristor is considered an ideal switch [5] and in the second group where the thyristor is replaced with a current source whose current decreases exponentially [6]. In the papers [1], [2], [3], [4], [7], [8] and [9] for analysis of the phenomena mentioned, the thyristor was replaced with a parallel RC circuit, but without a protective RC circuit, while in the paper [3], for analysis of RC protection, the thyristor was replaced with a nonlinear resistance. In this paper, voltage and current protection of the thyristor are analyzed, where the thyristor is replaced with a parallel RC circuit.…”