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Series Resonance Half-Bridge Converter

Transfer Function

Pro's

Con's

Vout = Vin*D/ü

Ü=Np/Nsek

T = ton + toff

Duty Cycle D=ton/T

Np = primary turns
Nsek = secondary turns

galvanic insulation Vin/Vout

operates practically without switching losses while having sinusoidal drain current and zero current switching (ZCS)

very high efficiency (see above)

fully short circuit capable without special requirements for high speed control circuits

excellent EMI performance

output voltage may only be regulated by change of the switching frequency

peak currents depend from both the load and the switching frequency

not suitable for wide range inputs, preferrably used as main converter together with boost pre converter

as with every bridge configuration, simultaneous turn-on of transistors leads to full system failure

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