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In this paper, we designed a LLC resonant converter as the main power supply of the medical Nd:YAG laser. First harmonic approximation (FHA) is used to model the LLC resonant converter. FHA equivalent circuit model and the transfer function of the LLC converter is proposed. Soft start technology is used to suppress the surge current. The laser output is simulated and experimented, the pulse laser...
AC overvoltage emerges on dc buses of a magnetically controlled shunt reactor when a turn-to-turn fault occurs within the control winding (CtrW). Overvoltage protections are thus employed. However, this paper addresses a problem in the application of overvoltage protection against CtrW turn-to-turn faults where such a protective scheme may operate in an unacceptable time delay or even malfunction...
Short circuit current characteristics of wind generators have been studied in this paper. Two types of wind generators have been considered. One is the induction generator; the other is the doubly-fed induction generator (DFIG). As to DFIG, there is always a crowbar to protect the power electronic converter at the rotor side. So the short circuit current of DFIG has been analyzed with consideration...
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