Vivanco UNIVERSAL SWITCHMODE AC TO DC MAINS ADAPTERS WITH USB CHARGING FUNCTION Guide de l'utilisateur télécharger pdf (Page 35)

Hardware Design

The transformer turns ratio, n, for the current doubling synchronous rectifier topology

can then be selected for the required operating input and output voltages using the

following ideal relationship shown in Equation 2-12.

EQUATION 2-12:

The previous equations governing the ZVT operation and resonant circuit component

selection are also dependent on the peak primary current. If the output inductor

magnetizing current is ignored, the primary peak current is given by Equation 2-13.

EQUATION 2-13:

FIGURE 2-5: ZVT FULL-BRIDGE POWER CONVERTER WITH

SYNCHRONOUS RECTIFICATION

max

oin

pri

VIN

IPRI

VPRI

VSEC

VOUT

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 117 118

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Vivanco UNIVERSAL SWITCHMODE AC TO DC MAINS ADAPTERS WITH USB CHARGING FUNCTION Guide de l'utilisateur Page 35