firing angle control

[gary7mge]

Can anyone here shed any light upon this problem for me? I want to use a 24V fixed+ V reg and power it from an ac supply. Easy. Well the ac supply has a variable voltage value, anything from 80 to 140 volts @50 - 60 Hz. The problem is that the V reg has input perameters of 26V min - 40V max. Another problem is that the neutral of the ac supply is electrically tied to the neutral of proposed 24v dc. I was thinking of a circuit that will chop the ac waveform at 30 volts using scr and transistor. Thats a familiar circuit for you 'motor control' guys I would have thought. Has anyone got any ideas? Or is there such a thing as a 24V reg with a v max in of about 70 volts? Any ideas would be of great use. Thanks all.

 

[fangas]

Hello Gary,

Have you looked at a power supply? Try looking here:

http://www.power-one.com

Ed

 

[blacksea]

The standard single output switching power supply has input voltage range 85...132VAC. Or use the same power supply with universal AC input 85...264VAC - see for example:

http://www.meanwell.com.

 

[gary7mge]

Thanks for your thoughts but I believe I have now found something that may do the trick. Its a variable regulator from Texas (TL783CKC) with a Vin max of 125V above Vout value. That gives me a Vin max of 149V @ Vout=24V. I will have this component in the morning so I will soon see if it will work or not. I have a power supply fitted to the machine already, its made by 'pheonix contact', but this is a rather expensive unit and is unsuitable for production.

 

[QUAVIET]

Firing angle is determined by which type of coordinates you are using. You have a square which is the most accurate, it is called right angle geometry. Then is that fails you have what is called Coordinate geometry which is two angles and side or two sides and an angle. And if that fails you always have scalene geometry which is shoot at the flash.