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Old 29th August 2005, 08:53 PM   #1
dddac is offline dddac  Germany
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Lightbulb Share my Soft Start Module for large Transformers

Made a simple and effective Soft Start Module for my 800VA Transformers for my ZAP Pulse amplifiers.

Works great. 8 seconds for the Tx to build up the inductionfield and it stops me resetting main fuses and there is no large hummm when the amplifier starts.

All safe stuff with low 12 V DC as well

FYI

Doede
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Old 29th August 2005, 08:54 PM   #2
dddac is offline dddac  Germany
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more pics
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Old 29th August 2005, 08:59 PM   #3
dddac is offline dddac  Germany
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circuit
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Old 29th August 2005, 09:00 PM   #4
dddac is offline dddac  Germany
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pcb
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Old 29th August 2005, 09:09 PM   #5
Mark Kravchenko --- www.kravchenko-audio.com
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Default Slick!

Thanks!

MArk
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Old 29th August 2005, 09:22 PM   #6
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Nice, thanks for sharing that.
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Old 30th August 2005, 03:01 AM   #7
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Hi Doede:
I presume there will be a kit offer for the lazy

It looks smaller than ampslab's offer wich works very well.
http://www.ampslab.com/inrush_schematics.htm

Isn't 8'' too much?

Thanx
Mauricio
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Old 30th August 2005, 06:22 AM   #8
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Guys,

Nice circuit. However there must be more distance on the PCB between the copper tracks of the circuit what is conencted to mainsvoltage and the low voltage.

6mm is the real minimu,m better is to go for 8mm.

Below 6mm you can have a dangerous situation!!

Regards,

Jan-Peter
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Old 30th August 2005, 10:59 AM   #9
Kenshin is offline Kenshin  China
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Why do it on the mains?
It could also be done on the second stage. (Large current relay needed)
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Old 30th August 2005, 06:07 PM   #10
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Quote:
Originally posted by Jan-Peter
Guys,

Nice circuit. However there must be more distance on the PCB between the copper tracks of the circuit what is conencted to mainsvoltage and the low voltage.

6mm is the real minimu,m better is to go for 8mm.

Below 6mm you can have a dangerous situation!!
J-P, you are right in general but not in this case. As long as Doede only uses his 12 V to drive the relay he must consider insulation between 230 V parts at the pcb and 230 V towards his chassis. So 8 mm from screwholes to any traces must he consider. I don't like the 230 V connection to the transformer, too short crepage distances. I use 3-pole 5 mm grid and uses only pin 1 and pin 3. Pin 3 is unconnected.

The smoothing needs only to be 100-220 uF for driving a relay. 2200 uF makes only the transformer warm.

The 230 V traces should withstand 10 A fuse so a little bit wider would be good. 100-150 mil wide and 70-105 um thick.

My softstarter can be found here if you don't know it already. I use the "dangerous" transformerless but reliable solution.
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