If price/performance is the foremost criterion, try Adlibre ($495) for mechanical 3D/2D design and Electronic Workbench (<$1K) for electrical (schematic/PCB/simulation)
AutoCAD to mechanical drafting is like CPM to Windows, even though I wish there is a good alternative to Win XP.
For serious...
Use the flyback topology, or better still, use the forward topology so you don't have to deal with right-half-plane zero and associated stability.
The transformer of those topologies takes care of negative output voltage.
Word of caution: switch-mode power supplies are deceptively simple on...
PC parallel port does have a few bits that can be read in the printer status register. Just take whatever the number of bits you need to count your nuts, which may be defined as a leading edge plus a trailing edge (010.
Obviously the case of two or more nuts stick together must be considered.
Use a buck converter or even a forward converter. However a good design is not for beginners, as the SMPS will more likely oscilate.
It's a tough design given the input voltage range.
For a good design house see
www.1stquadrant.com/services.htm
It normally takes several years to become...
jmarko was the closest to a decent solution. In that situation, a difference in output voltage of the transformers will cause one to work very hard while the other only steps in when the output impedance of the first transformer causes sufficient voltage drop as load current increases, to the...
Switchmode power supplies are not for beginners. It takes many years to reach a level of decent proficiency. Hundreds of PhD chose it as their specialty, and power electronic centers galore at universities. There're thousands of patents on the subject.
For inexpensive designs go to...
A475 is probably the marking on a SMD diode. For spec do a search on ON semi using the package style. Then you can search for A475 to get to the real PN.
Thank you wrjohnst for the links. I also did a search for EN/IEC-61000 standard and found their site, bought and download a standard, and did a SPICE simulation to make sure of EFT conformity. I had to pay 89 Swiss franks but that's a cost of doing business. I'm the company, shuck :). I...
Talking about international power systems, I need to know where I can get CE spec for power systems. I designed a power supply that needs to pass that kind of test.
The best to to start a discussion is by asking a question.
For RFOWLER re. passive PFC: It's not cost effective over 100W or so, depending on the technique. Contact me hqpower@sonic.net is you want a low cost high efficiency design.
I'm surprised to find so many RF experts on this thread. I...
90 to 270VAC is a usual range for switched-mode power supplies. It's also called universal input, and usually applicable for low cost SMPS up to 100W. For higher power a power factor corrector is often used.
For further info please email to hqpower@sonic.net.
