Originally posted by Matthew Jones
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almost like the game of 'telephone.'
Ronald Brandt stated in an interview that his device
extended the useful life of his batteries per charge
but that it would ultimately run down. The batteries
would require periodic charges to keep them going.
The device that he was describing was the one he
built for his automobile which was converted to electric.
This interview is available from at least two magazine
articles which appeared approximately 20 years ago.
It was not stated that his batteries required desulfation.
Only re-charging to compensate for the eventual
run-down of his device. It did not produce perpetual
motion.
Not a problem! The atmosphere in this particular rut
is a bit stale anyway.
For those who may want the 'secret' to a smoothly
functioning "Brandt-Tesla-Switch" which utilizes MosFets
as switches:
(1) Ordinary Low Side driver chips, preferably with an
opto-isolated input for isolation, are all that is necessary.
One for each of the six N-channel MosFets.
(2) A small toroidal transformer is utilized to bring power
to each of six driver circuits. The toroids are driven by
a high frequency oscillator of 50 ~ 100 KHz with the
output winding feeding a full wave voltage doubler to
produce a DC potential of 15 ~18 Volts to power the
MosFet Driver Chips.
The numbers of turns for the transformer (1:1) will be
determined empirically with 3 turns per volt as a starting point.
There are several chip devices which will serve well as
the Oscillator and Driver for the 6 toroidal transformers
whose primaries are parallel connected and fed through
'twisted pair' wiring to each. The total amount of power
required is not great.
Small Driver Boards are created for each of the MosFets
to be placed in close proximity to them.
(3) A Pulse Width Modulator Controller such as the 3525
is utilized to produce the drive pulses for the two banks
of batteries, switching the banks alternately between
"discharge" and "charge." The 3525 enables operation
over an adjustable range of frequencies with adjustable
pulse width 'duty cycle' and dead time.
(4) Some diagrams show capacitors in the output line
to the load. Their only purpose is to prevent a continuous
DC current path to the load in the event of some sort
of switching malfunction. 1000 uF may not be large
enough; you may want to use 4700 uF with low ESR.
The 'polarity' of the 'loop' as shown in early drawings is
incorrect. Use the polarity provided in the simple drawing
which shows the positions of the MosFets in the 'loop.'
This will assure that each MosFet is oriented to properly
conduct 'loop current' and avoids 'conflict' with the
MosFet body diodes.
Yes, it does work.
How long will it run? Depends upon your skill and patience
in 'tuning' it.

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