LiveRock Posted May 31, 2007 Report Share Posted May 31, 2007 HiI need to build a simple High voltage DC Power supply for my laser.Specs:Input: either 9-12 VDC or 240 VACOutput: 0-900VDCPossible solutions include using flyback, etc.Any ideas?My Projects:http://www.hotsource.net/projects/main.php?cmd=album&var2=1 Quote Link to comment Share on other sites More sharing options...
LiveRock Posted May 31, 2007 Author Report Share Posted May 31, 2007 I foundhttp://www.electronics-lab.com/forum/index.php?topic=6517.0Got questions:(a) How do I vary the output from 0-900V?(b) Will the transformer 'die' if the secondary is open?© Assuming I am using a input voltage of 0-12 V, what will be the transformer rating?Say, primary 12V, secondary 900VWill a 3V to 240V transformer work?If it does, does a 3v to 240V transformer handle 900V? Or must I get exact rating of 12V to 900V transformer?Thanks and hope to hear from the experts!! Cheers! Quote Link to comment Share on other sites More sharing options...
ZomBiE Posted May 31, 2007 Report Share Posted May 31, 2007 You're on right tracks. You should start by checking wattage that laser of yours needs, 0-900 is not neccessary. but say 100-900 would do. Transformer where output voltage rises when open, 900v is target, would easily rise above 1200v and that might create an arc between windings. I used super-glue to create extra isolation when i tried such high-voltage projects for CCFL lamps that required 800-1250v operating. but wattage needed on output is most significant in this case. If you need a 100W toroid transformer, it wont work. Toroids in general doesn't have good enough isolation for this. PCB encapsulated transformers would be the best choice because those have quite good isolation voltage, about 5000v winding-winding. Quote Link to comment Share on other sites More sharing options...
LiveRock Posted May 31, 2007 Author Report Share Posted May 31, 2007 Thanks, Zombie.Actually, I need the 800-900 VDC to charge capacitor, the energy will be release to a flashlamp in a instant that will lase a YAG Laser.Using a flyback transformer will yield too much voltage, right?how does a PCB encapsulated transformer look like? Is it a 'normal' squarish transformer with a metal core? Quote Link to comment Share on other sites More sharing options...
LiveRock Posted May 31, 2007 Author Report Share Posted May 31, 2007 I did a search and encap transformers look like:http://www.dagnall.co.uk/frame.asp?src=products.asp Quote Link to comment Share on other sites More sharing options...
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