# Rectification of 5 megaamps current

#### Javier Lopez 1

Joined May 21, 2019
8
Hello, my electric generator generates pulses of 5 megaamps that are almost half sinusoidal of 45khz frequency. There are 10 pulses per second.

I need to rectify that to store the energy in a capacitor bank.

What are the higher inrush current/dollar diodes or scrs?

Best regards,
Javier

#### djsfantasi

Joined Apr 11, 2010
7,228
What do you mean by “half sinusoidal”?

#### dl324

Joined Mar 30, 2015
12,255
5 megaamps that are almost half sinusoidal of 45khz frequency
What is the voltage? Are you certain the waveform is "half sinusoidal"? Do you really mean 5MA? Are you powering a town?

#### Alec_t

Joined Sep 17, 2013
11,801
Digikey list diodes rated up to 12000A only, so allowing for a bit of headroom you'd need a few hundred of those at £296 each. You must have deep pockets!

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#### BobTPH

Joined Jun 5, 2013
2,745
Hello, my electric generator generates pulses of 5 megaamps
Somehow I doubt that.

Wikipedia:
An average bolt of negative lightningcarries an electric current of 30,000 amperes (30 kA)
167 lightning bolts seems a bit high to me.

Bob

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#### Javier Lopez 1

Joined May 21, 2019
8
A half sine is the positive part. The voltage I measured was 550V, but I suppose it can go up to 1kV
I charged a large can 500V 24 millifarads capacitor to 550 volts in ten microseconds

#### djsfantasi

Joined Apr 11, 2010
7,228
A half sine is the positive part. The voltage I measured was 550V, but I suppose it can go up to 1kV
if that is true, then there is no need for rectification.

#### andrewmm

Joined Feb 25, 2011
907
How do you work out 5 mega amps ?
when you say generator, I first assumed a generator, petrol in , power out,
but I'm guessing its not that sort,

Any info on what your generator is
sound interesting.

#### DickCappels

Joined Aug 21, 2008
6,801
A half sine is the positive part. The voltage I measured was 550V, but I suppose it can go up to 1kV
I charged a large can 500V 24 millifarads capacitor to 550 volts in ten microseconds
The average current over that charging time is only 1.3 Megaamps. I think you would be best off to start talking with rectifier manufacturers because what you are looking for is probably going to be pretty special and not on distributor shelves.

Companies like Vishay, Plating Machine (+86 176 0674 3988), ABB (up to 550,000 amps https://new.abb.com/power-electronics/high-power-rectifiers), and I am sure you can find many others doing a search of the internet. I suggest you contact their sales departments by telephone to get the best answers.

#### Alec_t

Joined Sep 17, 2013
11,801
I charged a large can 500V 24 millifarads capacitor to 550 volts in ten microseconds
If you managed that without a rectifier, why are you now looking for diodes?

#### Javier Lopez 1

Joined May 21, 2019
8
I use plasma to charge the capacitor in the half part of the semi sine, but in the second part it is discharged, then I need the energy to stay there to be used outside. I should need the spice model to make the simulation.

#### DickCappels

Joined Aug 21, 2008
6,801
If I may ask, what are you making?

#### Javier Lopez 1

Joined May 21, 2019
8
I obtain the energy from Pulsotron-4 fusion reactor, I obtained the 4.5 MA at 10% of its maximum power. I am trying to ´slow down the pulse to have more time to recover the energy and have fewer amps (amps=-C*dV/dt, as larger dt fewer amps)

#### MrChips

Joined Oct 2, 2009
22,531
I obtain the energy from Pulsotron-4 fusion reactor, I obtained the 4.5 MA at 10% of its maximum power. I am trying to ´slow down the pulse to have more time to recover the energy and have fewer amps (amps=-C*dV/dt, as larger dt fewer amps)
Do you seriously think that this is the right place to be asking questions on your cutting edge project?

#### jpanhalt

Joined Jan 18, 2008
10,953

#### Javier Lopez 1

Joined May 21, 2019
8
I am not making public the project here, there is a web, only trying to obtain a method about how to rectify the generated energy.

#### Javier Lopez 1

Joined May 21, 2019
8
In other way following DickCappels recomendations I went to Vishay and say that high power rectifiers have non repetitive surge currents of >30kA, but not said nothing about repetitive ones, I should speak to Vishay or Infineon, I suppose.

In another way if there is a method to enlarge the pulse to a wider one without losing energy, it would be great

#### DickCappels

Joined Aug 21, 2008
6,801
Inductors do that but at the cost of efficiency.

#### jpanhalt

Joined Jan 18, 2008
10,953
In other way following DickCappels recomendations I went to Vishay and say that high power rectifiers have non repetitive surge currents of >30kA, but not said nothing about repetitive ones, I should speak to Vishay or Infineon, I suppose.
Most definitely, and be sure in your communication to tell VIshay why you need to do it.