LLC Resonant Converter
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This chapter studies the LLC resonant converter operation in different modes. First harmonic approximation (FHA) is used to obtain the main converter characteristics in steady-state, including the dc voltage static gain. The obtained equations and curves are used to design circuit parameters and predict performance, which is verified through numerical simulation. Operation below and above the resonance frequency is discussed, along with the impact of the operation region on the commutation of the power switches. The chapter also includes numerical examples to illustrate the theoretical analysis, proposed exercises with solutions and numerical simulations.
KeywordsResonant Converter First Harmonic Approximation (FHA) Static Gain Resonant Capacitor Topological State
- 1.Schmidmer, E.G.: A new high frequency resonant converter topology. In: HFPC Conference Record, pp. 9–16 (1988)Google Scholar
- 2.Sevems, R.P.: Topologies for three-element resonant converters. In: IEEE Transactions on Power Electronics, vol. 1.7, no. 1, pp. 89–98 (1992)Google Scholar
- 3.Lazar, J.F., Martinelli, R.: Steady-state analysis of the LLC series resonant converter. In: Sixteenth Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2001, vol. 2, pp. 728–735 (2001)Google Scholar
- 4.Yang, B., Lee, F.C., Zhang, A.J., Huang, G.: LLC resonant converter for front end DC/DC conversion. In: Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2002, vol. 2, pp. 1108–1112 (2002)Google Scholar