Circuit Project Electronic

Experiments with the PC power supply encouraged me to produce an “improved” design. Like the original design, the new power supply is also a forward converter with a half-bridge topology. The differences to the modified PC power supply consist of the following items: 1) two power FETs are used instead of bipolar transistors as power switches, 2) a synchronous rectifier on the secondary side instead of power diodes, 3) the elimination of a switch driver stage (current-proportional control), and 4) a simpler over-current and over-voltage monitor. With the magnetic components (output transformer, driver transformer, chokes…) stripped from a PC power supply, the new power supply delivers a max. power output of 250 W with efficiency up to 90 %. The power supply can handle 20 % overload for a short duration.

Read More Source:
http://www.qrp4u.de/docs/en/smps_new/
Thank you.

This entry was posted on Monday, September 3rd, 2007 at 8:59 pm and is filed under switching power supply. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.