CLLC converter calculator

Review forward and reverse operation on one resonant-tank page.

CLLC stages extend resonant conversion to an active bridge on each side of the isolation transformer. A practical design must cover both power-flow directions, component tolerance, load range, and the available switching-frequency window.

Tank quantities shown

The calculator reports primary and referred-secondary resonant quantities, characteristic impedance, normalized load, frequency range, forward/reverse gain curves, RMS and circulating-current estimates, semiconductor loss, and ZVS screening.

fr1 = 1 / (2π√(Lr1Cr1))
fr2 = 1 / (2π√(Lr2Cr2))

What requires deeper validation

First-harmonic analysis is useful for sizing and comparison, but switching transitions, transformer leakage distribution, rectification timing, nonlinear capacitance, control mode, magnetic loss, and start-up behavior require time-domain simulation and hardware measurement.

Open the CLLC tank calculator