Analysis and Control of Dual-Output LCLC Resonant Converters, and the Impact of Leakage Inductance

Abstract

Abstract-The analysis, design and control of 4th_order LCLC voltage-output series-parallel resonant converters (SPRCs) for the provision of multiple regulated outputs, is described. Specifically, state-variable concepts are developed to establish operating mode boundaries with which to describe the internal behaviour of dualoutput resonant converters, and the impact of output leakage inductance. The resulting models are compared with those obtained from SPICE simulations and measurements from a prototype power supply under closed loop control to verify the analysis, modeling and control predictions.

Analysis of an LCLC Resonant Converter with a Capacitive Output Filter

“…In addition, by using a higher order resonant circuit, it is possible to absorb all of the parasitic components of a converter, especially at very high switching frequencies [3], [12]. The LCLC resonant inverter is a forth order resonant topology which has been successfully used in different industrial applications such as space power distribution systems, resonant inverters, Ion generator power supplies, multi lamp operation ballasts, renewable energy power conditioning systems, constant-current power supplies and dual-output resonant converters [13]- [19]. This topology employs more parasitic elements and has many desirable characteristics.…”