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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Redesign, was low voltage drop transistors for power supply
OK, thanks to all who provided some guidance in the original post (see
'low voltage drop transistors for power supply' post. Clearly, this was a 12v supply and not a 13.8v supply. The actual output current ratings are not known, the only hint is that the original meter was a 25 amp meter. The transformer is much larger than 100 va and is actually larger than a 200 va unit (based on core size). When I tore down the rest of the assembly, I found more shaky stuff including sockets for the transistors that were soldered, several etch cuts and lifted run on the PCB, meter shunt was missing (probably discarded when the original pcb was replaced). In other words, it probably needs a complete redesign rather than using any of the original parts and pc boards. I ran LTC's power supply design software and it came up with a 13.8 volt output switching supply that will supply 14A with the existing power transformer. It uses the LTC1775 switching regulator, 2 X Si4410DY mosfets, an 11 uH inductor and a couple of 1N5818 schottky diodes. The supply itself (not including transformer losses and rectifier losses) provides 98 percent efficiency at 14A output. So, I'm considering building up this switching supply. I need suggestions for a schottkey bridge rectifier that will handle 20A or more. I find the diodes themselves are readily available, but I'd like to have a bridge assembly if possible. Any suggestions?? -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
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