DC analysis of half-bridge zero-voltage-switched multiresonant converter

Abstract

A complete dc analysis of the half-bridge zero-voltageswitched multiresonant converter is presented. The analysis uncovers for the first time four different modes of operation which are verified experimentally. A computer algorithm is developed for calculating the dc voltage-conversion-ratio characteristics and for facilitating the design optimization of the half-bridge multiresonant converter.

Development of Multiresonant ZVS High‐Frequency Inverter

“…The switching loss can be reduced by these soft switching circuits, but problems involving the settings of the load range arise, owing to limits on the soft switching region due to the relation between the load circuit constants and the operating frequency. In order to address such problems, investigations of soft switching circuits using multiresonant circuits, which are little affected by the load impedance, have been performed .…”

“…The load circuit configuration of the full‐bridge multiresonant ZVS high‐frequency inverter described in the present paper is similar to that of the half‐bridge type. However, conventional multiresonant circuits are made multiresonant primarily for the purpose of assuring soft switching over a wide operating range, while in contrast, the objective of the multiresonant circuit proposed in this paper is to reduce the conduction loss accompanying higher outputs and larger currents, and to reduce the switching loss resulting from multiresonant design by using the fewest possible circuit elements. However, the dead time settings required to achieve the above objective have a greater effect on the load circuit constants, the capacitance ratio, and the relationship to the output operating frequency than in a conventional series resonant ZVS inverter.…”