LLC parallel resonant converter design by scaling the LC converter

Author

Cheng, Jung-Wi ; Witulski, Arthur F.

Author_Institution

Aerosp. Equip. Syst., Allied-Signal Inc., Tucson, AZ, USA

Volume

34

Issue

3

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

924

Lastpage

933

Abstract

An efficient and practical method for steady-state design of an LLC-type parallel resonant dc/dc converter (LLC-PRC) is presented. In general, the output characteristic curves of LLC-PRC can be obtained by multiplying the output curves of the LC-type parallel resonant converter (LC-PRC) by a ratio of the parallel and series inductances. The peak voltage and current stresses on the resonant elements also depend on the same ratio. The LLC-PRC with a filter inductor is examined for two conduction modes, continuous and discontinuous capacitor voltage conduction modes, to show the effect of the inductance ratio. A means to use the derived equations to obtain the zero current switching (ZCS) is given. Also, a design procedure, along with design examples, is given to illustrate the use of the equations and characteristic curves. An experimental LLC-PRC is built to ensure the validity of the equations and design examples

Keywords

DC-DC power convertors; machine theory; resonant power convertors; state-space methods; DC/DC converter; LC converter scaling; LLC parallel resonant converter design; continuous capacitor voltage conduction mode; discontinuous capacitor voltage conduction mode; filter inductor; inductance ratio effect; output characteristic curves; parallel inductances; peak current stress; peak voltage stress; series inductances; state space model; steady-state design; zero current switching; DC-DC power converters; Design methodology; Equations; Filters; Inductors; Resonance; Steady-state; Stress; Voltage; Zero current switching;

fLanguage

English

Journal_Title

Aerospace and Electronic Systems, IEEE Transactions on

Publisher

ieee

ISSN

0018-9251

Type

jour

DOI

10.1109/7.705898

Filename

705898