"Scott Dorsey" wrote in message
...
Tio Pedro wrote:
The same problem with the DC flow in the
transformer exists when a power transformer
is used with a halfwave rectifier.
Typically the transformer rating is degraded by
60% when be using with halfwave rectication
due to the DC current flowing in the secondary.

No, the DC currents sum to zero. That derating is only required when
the transformer secondary is poorly balanced.
--scott


How does that occur in a half-wave circuit?
It is a series circuit. The half-wave
rectifier produces a voltage across the load that is
a complex waveform with both a DC and an AC component.
Since it is a series circuit, the same situation exists in the
transformer secondary. DC sums would be zero with a full
wave rectifier or a full-wave voltage doubler.

Pete