coil power units.. any help please..

[Paul Horwood]

I am using a IGBT APT45GP120B2DF2.



The power unit should be possible to work from at least 12volts up to
1200v(this is what these IGBTs can handle!) at about 54 amps standard, I
think 80 amps pulse.It probably wont need anything like this amount, I may
be able to do this with 20-30amps?



In reality I am thinking of a generic power unit that can be varied. Let me
explain:- The low voltage section of the circuit is run with a cmos 4017
with frequencies up to 1Khz(This I am achieving by using a function
generator as the trigger for the chip). This using a buffer transistor
lights some led's in a chaser light style. I need to know if the same
voltage that switches the led's can switch the IGBT? Or will I need more
buffer transistors? I even thought about isolation opto units, but am not
sure whether this will effect the final waveform of the pulse. For the
switching area of the IGBT, what would be needed? The IGBT has an intrinsic
diode to help with back emf from the coils(This is what is being
switched(solinoids)), but the rest of this bit of the circuit baffles me,
being high voltage. I need your input. I need to just be able to place an
external variable power voltage to the IGBTs for switching; this can be
anything from 12 volts to 1200 volts. So things need to be able to take some
welly.





Paul.

 

[Tim Shoppa]

I am using a IGBT APT45GP120B2DF2.



The power unit should be possible to work from at least 12volts up to
1200v(this is what these IGBTs can handle!) at about 54 amps standard, I
think 80 amps pulse.It probably wont need anything like this amount, I may
be able to do this with 20-30amps?

In reality I am thinking of a generic power unit that can be varied. Let me
explain:- The low voltage section of the circuit is run with a cmos 4017
with frequencies up to 1Khz(This I am achieving by using a function
generator as the trigger for the chip). This using a buffer transistor
lights some led's in a chaser light style. I need to know if the same
voltage that switches the led's can switch the IGBT? Or will I need more
buffer transistors? I even thought about isolation opto units, but am not
sure whether this will effect the final waveform of the pulse. For the
switching area of the IGBT, what would be needed? The IGBT has an intrinsic
diode to help with back emf from the coils(This is what is being
switched(solinoids)), but the rest of this bit of the circuit baffles me,
being high voltage. I need your input. I need to just be able to place an
external variable power voltage to the IGBTs for switching; this can be
anything from 12 volts to 1200 volts. So things need to be able to take some
welly.

You seem to be saying you want a variable power supply, 12V to 1200V, at
30 Amps or maybe 80 Amps?

This is a really serious amount of power, especially for a hobbyist
stepping up from a CMOS light chaser. 80Amps * 1200V is about 100kW.
A typical house feed in the US gets 240V at 60A or 100A or 200A (depending
on the age of the house) which is at most 48kW.

Tim.

 

[Bob Wilson]

I am using a IGBT APT45GP120B2DF2.



The power unit should be possible to work from at least 12volts up to
1200v(this is what these IGBTs can handle!) at about 54 amps standard, I
think 80 amps pulse.It probably wont need anything like this amount, I may
be able to do this with 20-30amps?



In reality I am thinking of a generic power unit that can be varied. Let me
explain:- The low voltage section of the circuit is run with a cmos 4017
with frequencies up to 1Khz(This I am achieving by using a function
generator as the trigger for the chip). This using a buffer transistor
lights some led's in a chaser light style. I need to know if the same
voltage that switches the led's can switch the IGBT? Or will I need more
buffer transistors? I even thought about isolation opto units, but am not
sure whether this will effect the final waveform of the pulse. For the
switching area of the IGBT, what would be needed? The IGBT has an intrinsic
diode to help with back emf from the coils(This is what is being
switched(solinoids)), but the rest of this bit of the circuit baffles me,
being high voltage. I need your input. I need to just be able to place an
external variable power voltage to the IGBTs for switching; this can be
anything from 12 volts to 1200 volts. So things need to be able to take some
welly.

I think you are in WAY over your head.

Bob.

 

[Ian Stirling]

You seem to be saying you want a variable power supply, 12V to 1200V, at
30 Amps or maybe 80 Amps?

This is a really serious amount of power, especially for a hobbyist
stepping up from a CMOS light chaser. 80Amps * 1200V is about 100kW.
A typical house feed in the US gets 240V at 60A or 100A or 200A (depending
on the age of the house) which is at most 48kW.

It's a bit early to be working on christmas illuminations too.

 

[Paul Horwood]

Sent: Friday, July 16, 2004 12:50
Subject: Re: coil power units.. any help please..

 

[Ian Stirling]

Sent: Friday, July 16, 2004 12:50
Subject: Re: coil power units.. any help please..

The maximum is whatever you are willing to pay for.
There should be no difficulty (other than financial) in arranging for
several megawatts, if you are in a moderately large city.
Much more may get really expensive.

It is also possible to switch these powers, but it's expensive.
Are you the one designing the magnets?
If so, what fields are you aiming at.
If not, then ask the person who wants the magnets what their 'wish list'
would be.
You need to know the inductance and resistance of the magnets.

 

[Rich Grise]

It's a bit early to be working on christmas illuminations too.

I don't know - with the magnitude of this project, if he starts today,
he might be done in time for Xmas 2006. ;-)