Page - 311 - in Emerging Technologies for Electric and Hybrid Vehicles

Energies 2016,9, 10 L1 =L4 =42.538μH.Because themagneticcoilsof theLCL-LCLtopologyare thesameas thoseof the LC-LCseries topology, theelectricparametersof theLC-LCseries topologyandLCL-LCLtopology canbesummarizedasshowninTable1. Table1.Detailedparametersof theLC-LCseries topologyandLCL-LCLtopology. LC-LCSeriesTopology LCL-LCLTopology Electricparameters Value Electricparameters Value Primary inductorLS 290.18μH Compensating inductorL1 43.2μH Parasitic resistanceRS 193mΩ Parasitic resistanceR1 53mΩ PrimarycapacitorCS 34.83nF PrimaryresonantcapacitorCS 234.75nF Secondary inductorLD 329.4μH Primary inductorLS 290.18μH Parasitic resistanceRD 213mΩ Parasitic resistanceRS 193mΩ SecondarycapacitorCD 30.89nF CompensatingcapacitorCS1 40.68nF Secondary inductorLD 329.4μH Parasitic resistanceRD 213mΩ CompensatingcapacitorCD1 35.07nF Compensating inductorL4 42.5μH Parasitic resistanceR4 42.5mΩ SecondaryresonantcapacitorCD 238.63nF The detailed efficiency expressions of LC-LC topology andLCL-LCL topology are given by references[27,30–32],andcanbealsodeducedusingMaple. Thenwesubstitute thedataofTable1 into thepowerandefficiencyexpressionsof theLC-LCseriesandLCL-LCLtopologies,andtheir resulting transfercharacteristicsareasshowninFigure3. Figure3ashowsthatthechargingpowerofthesetwotopologiesarethesame,despitethedifferent batteryvoltages,andFigure3bshowsthat theefficiencyof theLC-LCseries topology ishigher than thatof theLCL-LCLtopology.Notethat thetheoretical results ignorethelossescausedbytheHBridge andrectifier, so theefficiency lossesaremainlydueto theparasitic resistancesof the inductorsand capacitors. Theparasitic resistancesofcompensatingcapacitorsareusually ignored, for theyare far smaller thanthoseofmagneticcoils. ComparedwiththeLC-LCseries topology, theLCL-LCLtopology hasanother twocompensating inductors, theparasitic resistancesofwhich furthercauseadrop in the transferefficiency. Inorder toverify thecorrectnessof theoretical calculations, theexperimentsare performed,andtheresultsareshowninFigure4. (a) 40 80 120 160 200 0 200 400 600 800 1000 PLC-LC (VB=100V) PLCL-LCL (VB=100V) PLC-LC (VB=75V) PLCL-LCL (VB=75V) PLC-LC (VB=50V) PLCL-LCL (VB=50V) Input Voltage VS(V) ȱ (b) 40 80 120 160 200 0.93 0.94 0.95 0.96 0.97 0.98 0.99 Ș LC-LC (VB=100V) Ș LCL-LCL (VB=100V) Ș LC-LC (VB=75V) Ș LCL-LCL (VB=75V) Ș LC-LC (VB=50V) Ș LCL-LCL (VB=50V) Input Voltage VS (V) Figure3.Theoretical transferpower (a) andefficiencies (b)of theLC-LCseriesandLCL-LCLtopologies. 311