Cap Dump Circuit

[boguslaw]

Oh! What a MONSTER ! How do you plan to protect capacitors from overvoltage ? I'm pulling hairs from my head trying to implement simple and effective solution.
Spark gap is the best solution because it can be switching and limiting device all in one, but since we use mosfets or igbt the resonant rise will often damage circuits.

[BroMikey]

Cap Voltage limits

Oh! What a MONSTER ! How do you plan to protect capacitors from overvoltage ? I'm pulling hairs from my head trying to implement simple and effective solution.
Spark gap is the best solution because it can be switching and limiting device all in one, but since we use mosfets or igbt the resonant rise will often damage circuits.

About the Energizer boost converter that charge the caps.

I use the 3:1 rule. For fast resistance free charging of caps always buy 3X voltage. For instance my input supply will not exceed 100volts using a transformer and I dump at 90vdc. My caps are 250vdc.

The best way to protect for over voltages is to limit the trigger wire on the boost converter. If you HAVE a trigger coil. Either way the fets can be controlled at the trigger leg. Many types of SSSG converters exist.

One large fet in the triggering circuit could stop the rising voltage. Or limit to a certain level. If I find a good circuit I will post it.

Mikey

[BroMikey]

Okay I am back with a small update.

Remember when I got my big batteries last year in the summer? Well in this video I made back then https://www.youtube.com/watch?v=zo-HVy7gtBI all I had was a tiny dump.

Since then many of you knew I built a larger capacitor discharge bank.
Well I wanted you all to know it still works and I just went down stairs to top off the Big Battery Bank. I have been discharging the bank on and off for many days over the past few months plus this week the power lines all got knocked down. Wires all over the place with half broken off poles still connected and running power in the lines.

Crazy power companies.

The wind blows and we are out of power over the least little one, flicker, brownout, throw the secondaries 2 seconds and run for the GENSET or in my case for the battery bank.

Well It works everytime. The batteries were not low, each cell was completely wet with the ALUM yet I poured a tiny bit more into each of the huge cells. the cells are aprox 9" X 9" X 32" tall a total of 12 cells to make up my 24 pack and the entire topping off process took only 2-3 quarts which over filled them just in case.

For years my batteries would always fail and during the power outages we used a GASOLINE GENSET converted to propane. Not anymore. We still have the genset in case of a 1 week outage like last time but generally the outages last only 4- 8 hours.

This time was the best ending battery voltage I had every seen with my new set. I ran 500 watts all evening and over night and ended at 12.25volts resting voltage. Also i have run these converted ALUM batteries down lower than any acid battery and they give me twice as much power.

It takes twice the energy to charge them of course but the power is there, something conventional chargers may not allow. I like practical devices. If I can't make it work well consistently, I don't want it. If the circuit goes up in smoke every few days it is worthless.

I fire 12 tiny fets to dump my batteries. They all open together at the same time and mosfet gates are less power hungry than high powered audio transistors. So I used a single bipolar transistor to fire all of the gates. An opto triggers the single transistor. The gates do not all open perfectly simultaneously so to balance the network I use the short coils of heavy awg wire to create a miniscule amount of resistance seen by the fets yet still negligible. The coils are also known as arc suppression coils. Wire wound resistors are the same thing.

The Mosfets went completely cold after using the coils to suppress arcing.

The heat (What little there was in the fets) went to the coils on the front and back side, so in 110 degree heat the fet run very cool.

The only thing left to do is finish my beast oscillator so I can fill the caps with the good stuff

[BroMikey]

Last year I worked on many cap dumps that can be used to
charge a battery. This diagram is a specific application but all
it does is to take a DC source and turn is on and off at 1-10
pulses per second to charge the batteries.

It is a very slow Pulse Width Modulator, a timer circuit that
uses the transistor switch at a very low rate of speed.

This circuit is your basic REGULATOR manually adjusted

[BroMikey]

Thank you Bob for the reply!
Does some one here have some cap dump schematic to share?
It can also be mecanic one...
Thanks !

John Bedini Cap Dump

[VIDEO]https://www.youtube.com/watch?v=TRLVhKzamUE[/VIDEO]

[Wistiti]

John Bedini Cap Dump

[VIDEO]https://www.youtube.com/watch?v=TRLVhKzamUE[/VIDEO]

[SkyWatcher]

Hi all, Hi mike, do you or anyone have the cap dump circuit bedini is using in that video, thanks.
peace love light

[BroMikey]

Hi all, Hi mike, do you or anyone have the cap dump circuit bedini is using in that video, thanks.
peace love light

It is here somewhere. John B called it a comparitor like we find in a 555
timer but he maybe using an LM339 I can think right now. Although you
can look at what he says.

John says in THE video that when the setting made the cap will discharge
at the voltage not based on time. His waits for the set voltage to dump.

This can be done using zeners at the base of the transistor creating
an automatically fired "ADJUSTABLE CROWBAR"

I talk about the simple "CROWBAR" extensively in the adjacent thread
to this one called "Mikey's Beast SSSG Oscillator"

I need to but I haven't built that one yet.

http://www.energeticforum.com/renewa...illator-7.html