Peter C. Wallace wrote: >50 KHz is pretty high for PWM, as the switching losses in the HBridge go up, >and the dead time becomes more of the total cycle time. > My first cut at a PWM servo drive ran at 100 KHz, using analog components to make a velocity servo amp with the traditonal ramp generator/comparator to produce the PWM pulses.
At 50 KHz, the switching losses are small compared to the conduction losses at 20 A continuous output current. This is helped greatly by using the sign/magnitude modulation scheme instead of synchronous antiphase modulation. The switching losses at 0% PWM are zero! Jon ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
