The invention relates to a
parameter design method for a phase-shifted full-bridge converter based on a ZVS load range, and the method comprises the steps: calculating the turn ratio n of a primary side to a
secondary side of a
transformer according to the gains of an input
voltage Vin and an output
voltage Vo and the maximum allowable duty ratio loss Dloss _ max of a
system; calculating the output filter
inductance L0 according to a
volt-second balance principle of the output filter
inductance L0 and the current
ripple coefficient alpha of an output
inductor; constructing a function
lambda1(Lr, Dloss _
lambda) about the ZVS
soft switching range
lambda and the duty ratio loss Dloss_lambda under the lambdaIo load condition according to the
volt-second balance principle of a resonant inductorLr; according to a
hysteresis arm
soft switching realization condition, taking energy stored by the resonant
inductor Lr equals energy required for completing current conversion by a
hysteresis arm parallel
capacitor Clag as a
critical condition, and constructing a function lambda 2 (Lr, Dloss _ lambda); and solving a set M (lambda, Lr, Dloss _ lambda) of all points satisfying the critical
soft switching condition lambda 1 (Lr, Dloses _ lambda) = lambda 2 (Lr, Dloses _ lambda), and determining an optimal solution (lambda, Lr, Dloss _ lambda). According to the method, circuit parameters of thephase-shifted full-bridge ZVS converter can be screened and designed simply and visually.