The Experts below are selected from a list of 48 Experts worldwide ranked by ideXlab platform

Qin Zuyin - One of the best experts on this subject based on the ideXlab platform.

  • design of the flyback switching converter based on Maximum Duty Cycle
    IEEE Transactions on Power Electronics, 2006
    Co-Authors: Qin Zuyin
    Abstract:

    Designing a good flyback power supply is useful but not so easy for hardware designers.This paper aims at discussing the principle of flyback and introducing a new design process of flyback switching converter which can be used for various PWM IC controlling.This paper advances the formula for calculating the primary inductance in transformer based on the Maximum Duty Cycle and researches the characteristics of flyback voltage with a purpose of discussing the formula of flyback voltage.

V Ramanarayanan - One of the best experts on this subject based on the ideXlab platform.

  • steady state stability of current mode active clamp zvs dc dc converters
    IEEE Transactions on Power Electronics, 2010
    Co-Authors: N Lakshminarasamma, M Masihuzzaman, V Ramanarayanan
    Abstract:

    Active-clamp dc-dc converters are pulsewidth-modulated converters having two switches featuring zero-voltage switching at frequencies beyond 100 kHz. Generalized equivalent circuits valid for steady-state and dynamic performance have been proposed for the family of active-clamp converters. The active-clamp converter is analyzed for its dynamic behavior under current control in this paper. The steady-state stability analysis is presented. On account of the lossless damping inherent in the active-clamp converters, it appears that the stability region in the current-controlled active-clamp converters get extended for Duty ratios, a little greater than 0.5 unlike in conventional hard-switched converters. The conventional graphical approach fails to assess the stability of current-controlled active-clamp converters, due to the coupling between the filter inductor current and resonant inductor current. An analysis that takes into account the presence of the resonant elements is presented to establish the condition for stability. This method correctly predicts the stability of the current-controlled active-clamp converters. A simple expression for the Maximum Duty Cycle for subharmonic-free operation is obtained. The results are verified experimentally.

Fontana Flavio - One of the best experts on this subject based on the ideXlab platform.

  • Maximum soliton-train Duty Cycle in harmonically mode-locked fiber lasers
    Journal of the Optical Society of America B, 1995
    Co-Authors: Marco Romagnoli, Michele Midrio, Pierluigi Franco, Fontana Flavio
    Abstract:

    We analyze the main methods for high-repetition-rate soliton generation in fiber lasers in view of the applications to fiber transmission. Particular emphasis is given to the problem of intracavity soliton interactions and stabilization methods. Because of the interactions we find that the Maximum Duty Cycle achievable in a soliton source is 0.22. We also find that the relative phase difference between adjacent solitons may be controlled by means of an intracavity etalon, whereas without the etalon the solitons are stable only when they are out of phase. Moreover the introduction of the intracavity etalon has led to a strong reduction in the fluctuations of the soliton parameters induced by quantum noise.

N Lakshminarasamma - One of the best experts on this subject based on the ideXlab platform.

  • steady state stability of current mode active clamp zvs dc dc converters
    IEEE Transactions on Power Electronics, 2010
    Co-Authors: N Lakshminarasamma, M Masihuzzaman, V Ramanarayanan
    Abstract:

    Active-clamp dc-dc converters are pulsewidth-modulated converters having two switches featuring zero-voltage switching at frequencies beyond 100 kHz. Generalized equivalent circuits valid for steady-state and dynamic performance have been proposed for the family of active-clamp converters. The active-clamp converter is analyzed for its dynamic behavior under current control in this paper. The steady-state stability analysis is presented. On account of the lossless damping inherent in the active-clamp converters, it appears that the stability region in the current-controlled active-clamp converters get extended for Duty ratios, a little greater than 0.5 unlike in conventional hard-switched converters. The conventional graphical approach fails to assess the stability of current-controlled active-clamp converters, due to the coupling between the filter inductor current and resonant inductor current. An analysis that takes into account the presence of the resonant elements is presented to establish the condition for stability. This method correctly predicts the stability of the current-controlled active-clamp converters. A simple expression for the Maximum Duty Cycle for subharmonic-free operation is obtained. The results are verified experimentally.

Gunwoo Moon - One of the best experts on this subject based on the ideXlab platform.

  • a new center tapped half bridge zeta converter with small transformer dc offset current and low voltage stress
    IEEE Transactions on Power Electronics, 2015
    Co-Authors: Kibum Park, Hanshin Youn, Gunwoo Moon
    Abstract:

    In this paper, an asymmetrical half-bridge (AHB) converter employing a new center-tapped zeta rectifier (CTZR) is proposed to achieve a high efficiency in wide-input-voltage and low-output-current applications. Due to the proposed CTZR with high dc conversion ratio and extended Maximum Duty Cycle above 0.5, the transformer turns ratio of the proposed converter can be increased, which decreases the transformer dc-offset current compared with that of the AHB converter. Therefore, its transformer core size is decreased. Moreover, it has a wide zero-voltage-switching range with small transformer leakage inductor, which improves light and medium load efficiency. Furthermore, since it has low voltage stress on the secondary diode, its conduction loss can be reduced. In addition, due to the elimination of a diode, the snubber loss in the secondary side is reduced compared with the AHB converter. Therefore, the proposed converter can achieve a higher efficiency compared with the AHB converter without additional devices. To confirm the operation, features, and validity of the proposed converter, a 250–400 V input and 50 V/250 W output laboratory prototype is built and tested.