Title

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

Abstract

A new type of zero-voltage-transition pulsewidth modulation (PWM) dc-dc 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. © 1998 IEEE Publisher Item Identifier S 1057-7122(98)07717-4.

Publication Date

12-1-1998

Publication Title

IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications

Volume

45

Issue

11

Number of Pages

1121-1128

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/81.735434

Socpus ID

0032202344 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0032202344

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