Energy in a capacitor
Wagner Lipnharski email (remove spam text)
Just measuring the secondary voltage would not give you the right
information about transfered power... you really need to consume power
at the secondary to get the right information. Measuring Voltage and
Current at the secondary is necessary, then using the pic to do the
multiplication, or just use a quadrant multiplier...
When the secondary is rectifying to DC, you can play with the frequency,
dutty cycle and so on at the primary, to reach the best transformer
There is a non linear curve about this productivity, if the secondary
circuits are consuming much power, the transformer would have its
magnetic flux at maximum and it would not be able to transfer more
power, so the "final productivity" drops down.
Some old TV transformer "stabilizers" used "saturated transformers", it
means that the transformer was plugged at 117Vac driving a TV, but it
already gets saturated early at 90Vac, and if the line voltage drops to
100Vac, its output would not change, since it still saturated...
Some IBM large mainframes use an external "motor-generator", bigger as a
fridge, an huge motor and generator. The motor runs in automatic
star-delta configuration attached to 60Hz-208Vac tri-phase, and it
mechanically drives a 400Hz 208Vac also tri-phase generator. At 400Hz,
the wires and cables can be smaller, also the transformers, and the
filtering capacitors. As the mainframe computer is almost 1/5 of its
size just power supplies, you can imagine the gain in space of just
using 400Hz instead 60Hz...
seeking: microchip devices pic
See also: www.piclist.com/techref/index.htm?key=energy+capacitor
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