Re: GPZ500 No Spark!


Fred W wrote:
Rick Cortese wrote:

There's also a scheme going around where you recharge a battery with
high frequency DC for extended periods, a solar house magazine had it
online somewhere. Their test data indicated it worked but...


That one's going to need some 'splaining. Last time I checked, DC had a
frequency of zero.

The only zero frequency DC I know of offhand is static electricity and
DC from a battery.

Any rotating device that uses copper windings wrapped around pole shoes
that pass through a magnetic field is going to have a frequency
depending upon the number of
pole shoes and the RPM.

A DC generator puts out AC current that is "rectified" through brushes
and a commutator, selecting the positive alternation of the armature's
output. This produces rippling DC which an oscilloscope would show as
only the positive halves of the sine wave above the zero line.

An AC alternator produces AC current that is rectified through a three
phase full wave rectifier bridge made of six diodes. This also produces
rippling DC which an oscilloscope would show as only the positive
halves of the sine wave above the zero line.

The peaks of the positive halves of the sine wave are so brief that
engineers don't rate their device by the peaks. They have a calculation
called "root mean square" that
shows the usable part of the alternation to be 0.707 times the peak.

If you have a solid state device that produces AC current by running an
oscillator circuit that feeds AC into a rectifier, you may be
interested in produce a DC with as little ripple as possible, because
it makes an annoying buzzing sound in audio outputs.

Solid state power supplies will have large coils to slow the passage of
current and a bunch of capacitors to absorb voltage surges in order to
smooth out the DC output.

The ripple effect of DC current from an automotive alternator is
reduced by the battery's ability to absorb and block the highest
momentary voltages.

.

Relevant Pages

  • Re: RMS current on AVR microcontroller
    ... current sensor is a sine wave within about +-3amps. ... If you know the input frequency to the 3-phase rectifier and the ... There is no filtering on the output too. ...
    (sci.electronics.design)
  • Re: RMS current on AVR microcontroller
    ... The signal into the allegro ... current sensor is a sine wave within about +-3amps. ... If you know the input frequency to the 3-phase rectifier and the ...
    (sci.electronics.design)
  • Re: LED Xmas lights
    ... I was actually going to try that, but don't have a 120V rectifier now ... >string) on either side of the rectifier. ... give accurate RMS readings except on a good sine wave. ... BTW, with the LED lights, the blue ones are noticeably brighter than ...
    (alt.home.repair)
  • Re: Power Measuring!! Need Assistance
    ... > ie, When the load is a pure reactance, = zero power. ... To actually talk about the average value of a sine wave over ONE ... 250V we are actually talking about a different kind of average the rms ... Square the Sine ...
    (sci.electronics.design)
  • Re: The KISS AMP: a progress report
    ... what you are writing is that clipping off half the sine wave ... will have no effect on the secondary voltage, or it will drop it to ... There is a way the single diode could be used to cut the volts out of the ... rectifier in half, but only if the filter network is choke input. ...
    (rec.audio.tubes)
Loading