Ensretter i serie og parallel

Hej Tom

Du får netop begge dele.

Citat: "... For single-phase AC, if the transformer is center-tapped, then two diodes back-to-back (cathode-to-cathode or anode-to-anode, depending upon output polarity required) can form a full-wave rectifier. Twice as many turns are required on the transformer secondary to obtain the same output voltage than for a bridge rectifier, but the power rating is unchanged. ..."

Citat: "... This form of circuit saves on rectifier diodes compared to a diode bridge, but has poorer utilization of the transformer windings. ... The center-tapped rectifiers are preferred to the full bridge rectifier when the output DC current is high and the output voltage is low. ..."

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Den "gamle" løsning:

"... A variant of this is to use two capacitors in series for the output smoothing on a bridge rectifier then place a switch between the midpoint of those capacitors and one of the AC input terminals. With the switch open this circuit will act like a normal bridge rectifier. With the switch closed it will act like a voltage doubling rectifier. In other words this makes it easy to derive a voltage of roughly 320 V (±15%, approx.) DC from any 120 V or 230 V mains supply in the world, this can then be fed into a relatively simple switched-mode power supply. ..."

/Glenn