Zero-voltage transition converter with high efficiency operating at constant switching frequency

    Authors

    H. Wei;A. Ioinovici

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abbreviated Journal Title

    IEEE Trans. Circuits Syst. I-Fundam. Theor. Appl.

    Keywords

    RECTIFIERS; Engineering, Electrical & Electronic

    Abstract

    A new type of zero-voltage-transition pulsewidth modulation (PWM) de-de converter is developed by adding two active switches and three diodes to the structure of a quasiresonant converter. The resonant capacitors are not discrete elements, their role is played by the parasitic capacitances of the MOSFET's. By adjusting the interval between the operation of the active switches, a duty-cycle control is obtained, Soft-switching is ensured for all switches for a wide line range and load range. One of the additional diodes is connected in the input circuit and the energy flow in the resonant stage is transferred from a path defined by the two additional transistors to a path given by the two additional diodes in the resonant tank; as a result, the resonant capacitor voltage is prevented from surpassing the input voltage; it drops to zero before the main switch is turned on. All switches are subjected to voltage and current stresses as those in their PWM classical counterparts, implying small conduction losses. The new converter exhibits a high efficiency and good regulation capability.

    Journal Title

    Ieee Transactions on Circuits and Systems I-Fundamental Theory and Applications

    Volume

    45

    Issue/Number

    11

    Publication Date

    1-1-1998

    Document Type

    Article

    Language

    English

    First Page

    1121

    Last Page

    1128

    WOS Identifier

    WOS:000077225600001

    ISSN

    1057-7122

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