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It's best to read the
page on the half-wave
rectifier, first.
Point A is doing the
opposite of point B.
As A increases in a
positive direction, B
increases negatively,
and vice-versa.
When A is positive, D1
is forward biased and
charges C1 to the peak
voltage, as in diagram
2.
D 2 is reverse biased
and does not conduct.
When A goes negative, D1
is reverse biased and
does not conduct.
D2 is forward biased and
charges C2 to the peak
voltage, as in diagram
3.
We now have two
capacitors in series,
each charged to the peak
voltage.
The voltage across the
load is. therefore,
twice the peak voltage.
The voltage has been
doubled.
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