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Dc Soft Start Help


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#1 Peteruk

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Posted 28 July 2009 - 10:14 PM

Hi desperately rolleyes.gif looking for a simple soft start circuit , 12 volt around 10 to 15 amps around 1/2 ...to... 1 second to full speed (building a tug for heavy loads needs to take out the jolt )....maybe using a power mosfet (with protection) and the ne555 ? or would a simple r/c with a power mosfet circuit do , any help would be much appreciated .... Peter

#2 marke

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Posted 01 August 2009 - 09:29 PM

Hello Peter

If you are only looking for a start time of around a second, I would suggest a series resistance that is bridged out by a contact. - the resistance could be made up of a length of wire as the time is short and the total dissipation will be low.
If you were wanting an extended start time, a solid state circuit would be of value by reducing the power dissipation. If you did use a solid state (MOSFET) circuit, you would robably still short it out to reduce the power dissipation.

Best regards,
Mark.




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