High efficiency, high power density and wide output voltage are required for on-board charger (OBC) applications. LLC resonant converter has the advantage of achieving zero-voltage switching for variable frequency and different load conditions. Compared with conventional fundamental harmonic approximation method, operation-mode analysis based on the time domain model provides an accurate description of resonant current, voltage and DC gain. In this study, the efficiency-oriented modified method is proposed based on the operation-mode analysis. The converter inductance ratio, characteristic impedance and transformer turns ratio are optimised and both-side soft switching can be achieved in the high output voltage region. Conduction loss can be minimised by optimising resonant parameters. Finally, a high-efficiency design method is proposed and validated through experiments on a 3.3 kW prototype applied in OBC. The prototype of the LLC resonant converter has been tested for dynamic charging voltage (230–430 V) with a peak efficiency value of 98.5%.
High-efficiency design method of LLC resonant converter for PHEV battery chargers (based on time-domain model)
IET Electrical Systems in Transportation ; 10 , 3 ; 234-242
2020-03-04
9 pages
Article (Journal)
Electronic Resource
English
dynamic charging voltage , resonant power convertors , resonant current , wide output voltage , zero-voltage switching , electric vehicle charging , converter inductance ratio , time-domain analysis , PHEV battery chargers , efficiency-oriented modified method , resonant parameters optimisation , fundamental harmonic approximation method , high output voltage region , switching convertors , OBC , peak efficiency value , hybrid electric vehicles , time-domain model , high power density , both-side soft switching , on-board charger applications , zero voltage switching , power 3.3 kW , load conditions , battery powered vehicles , LLC resonant converter , voltage 230.0 V to 430.0 V , variable frequency , zero current switching , transformer turns ratio , characteristic impedance , optimisation , operation-mode analysis , high-efficiency design method , battery chargers
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