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Tool Talk Discussion Forum

Re: John T Electrical question

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John T

12-12-2012 12:18:10
216.249.82.117



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SORRY I JUST CANT ANSWER THE QUESTION EXACTLY BUTTTTTTTT I DO HAVE SOME THOUGHTS FWIW

Not knowing the entire circuit and how it functions I cant say for sure, maybe the more electronic (Im more into AC Power Distribution then electronics) gents here or those familiar with a magneto charger can enlighten us??? I do know they have to supply a heavy discharge of DC current for a really strong magnetic field in order to magnetize the mags rotor.

For example, the Capacitors could be used to smooth out and filter the badly pulsed DC wave that results from a diode and half wave rectification??? (But I sorta doubt thats how they are used in your unit, unfiltered pulsing DC is still DC current)

The capacitors (Im sorta thinkin this is how your unit works) could be used to store energy and then provide the capacitor discharge form of sudden released current energy kind of like you seem to be thinking (you metioned capacitor discharge)

If the above is their function, simply to store energy, the more in paralell and/or the higher capacitance rating, the more instantaneous current they could dump to create an even stronger magnetic field !!!!!!!!!!!! HOWEVER you have to match that with the current and capacity the rectifier circuit can produce so once the capacitors are discharged and the rectifier circuit starts to pump current into them the rectifier part of the circuit and the diodes current rating isnt exceeded (cuz theres just toooooo muchhhhhhh capacitance) and you end up frying things!!!!!!!!!

MY BOTTOM LINE BEST "GUESS" IS GONNA BE WHILE THE EXACT CAPACITANCE ISNT NECESSARY AND A TAD MORE WONT HURT,,,,,,,,,IM AFRAID IF THERES TOO MUCH CAPACITANCE YOU MIGHT OVERCURRENT AND DAMAGE THE RECTIFIER CIRCUIT!!!!!!!!

THIS IS NOT AN ANSWER REMEMBER ONLY MY BEST GUESS SO DONT ANYONE HAVE A CALF NOW LOL

John T

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Bob M

12-12-2012 16:08:32
69.207.86.27



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 Re: John T Electrical question in reply to John T, 12-12-2012 12:18:10  
Quoting Removed, click Modern View to see

Hey John T - Those are my thoughts exactly!
A bit more capacitance won't hurt. But adding too much (ie. an additional cap) risks damage to the rectifier circuit when the unit charges due to the higher inrush current it must now handle.

ALSO......increasing capacitance beyond design translates into much greater peak current pulses when the caps discharge. This MAY damage other parts in the circuit. Further, it could become a life safety issue should you accidentally contact the fully-charged capacitor bank or the output wiring.

I'd replace the caps with the same capacitance value and leave it alone.

Bob M, the retired ME.

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Cliff(VA)

12-13-2012 05:19:57
70.89.233.37



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 Re: John T Electrical question in reply to Bob M, 12-12-2012 16:08:32  
There are so many things to consider when designing circuitry. In-rush current, charge transfer, wattage rating of down stream components. Without looking at the circuit in detail it is hard to give a good opinion.

I will agree with Bob, Same capacitance, same voltage, leave it alone.

Cliff(VA)
Active EE circuit designer



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John T

12-12-2012 17:24:49
216.249.82.117



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 Re: John T Electrical question in reply to Bob M, 12-12-2012 16:08:32  
Hey if BOTH a Mechanical and an Electrical Enginner agree........WE ARE SURELY RIGHT LOL

John T



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