John Larkin wrote:> > Please post the schematic of a zero-ripple switcher. > > JohnSorry, but that feature is only available on the 0 volt model. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida
Building Coaxial transmission line on PCB?
Started by ●February 12, 2007
Reply by ●February 16, 20072007-02-16
Reply by ●February 16, 20072007-02-16
Michael A. Terrell wrote:> John Larkin wrote: > >>Please post the schematic of a zero-ripple switcher. >> >>John > > > > Sorry, but that feature is only available on the 0 volt model. >Indeed there are the topologies of the switchers with exactly zero or almost zero ripple, assuming the ideal symmetry of everything. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
Reply by ●February 16, 20072007-02-16
John Larkin wrote:>... snip ...> > Please post the schematic of a zero-ripple switcher.All it takes is an infinite capacity capacitor. The turn-on time and inrush current may be high. However it avoids the need for a UPS. Once they get the breakdown voltage up and get them into production we can have all the electric cars we want, and dispense with all batteries. -- <http://www.cs.auckland.ac.nz/~pgut001/pubs/vista_cost.txt> <http://www.securityfocus.com/columnists/423> "A man who is right every time is not likely to do very much." -- Francis Crick, co-discover of DNA "There is nothing more amazing than stupidity in action." -- Thomas Matthews
Reply by ●February 16, 20072007-02-16
On Fri, 16 Feb 2007 18:25:11 GMT, Vladimir Vassilevsky <antispam_bogus@hotmail.com> wrote:> > >Michael A. Terrell wrote: >> John Larkin wrote: >> >>>Please post the schematic of a zero-ripple switcher. >>> >>>John >> >> >> >> Sorry, but that feature is only available on the 0 volt model. >> > >Indeed there are the topologies of the switchers with exactly zero or >almost zero ripple, assuming the ideal symmetry of everything. >Like a polyphase switcher with *big* inductors? But I don't want "almost zero ripple", I want the real thing. John
Reply by ●February 16, 20072007-02-16
John Larkin wrote:>>>>Please post the schematic of a zero-ripple switcher. >>>Sorry, but that feature is only available on the 0 volt model. >>> >>Indeed there are the topologies of the switchers with exactly zero or >>almost zero ripple, assuming the ideal symmetry of everything. >> > > > Like a polyphase switcher with *big* inductors? > But I don't want "almost zero ripple", I want the real thing.Zero ripple is a real thing. Imagine the two identical bucks operating 50/50 duty with 180 degree phase shift on the common load. Ideally, there will be no ripple at the load at all. There are numerous patents on the variations of this idea, allowing to adjust the duty, different topologies and such. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
Reply by ●February 16, 20072007-02-16
On Fri, 16 Feb 2007 14:18:55 -0500, CBFalconer <cbfalconer@yahoo.com> wrote:>John Larkin wrote: >> >... snip ... >> >> Please post the schematic of a zero-ripple switcher. > >All it takes is an infinite capacity capacitor. The turn-on time >and inrush current may be high. However it avoids the need for a >UPS. Once they get the breakdown voltage up and get them into >production we can have all the electric cars we want, and dispense >with all batteries.Right. You'd buy them charged, guaranted to run for 200K miles. John
Reply by ●February 16, 20072007-02-16
John Larkin wrote:> On Fri, 16 Feb 2007 14:18:55 -0500, CBFalconer <cbfalconer@yahoo.com> > wrote: >>John Larkin wrote: >> >>... snip ... >> >>All it takes is an infinite capacity capacitor. The turn-on time >>and inrush current may be high. However it avoids the need for a >>UPS. Once they get the breakdown voltage up and get them into >>production we can have all the electric cars we want, and dispense >>with all batteries. >This is interesting: http://www.engr.wisc.edu/groups/green/ultra.html Regards, Michael
Reply by ●February 16, 20072007-02-16
On Fri, 16 Feb 2007 18:17:02 GMT, "Michael A. Terrell" <mike.terrell@earthlink.net> Gave us:>John Larkin wrote: >> >> Please post the schematic of a zero-ripple switcher. >> >> John > > > Sorry, but that feature is only available on the 0 volt model.Are they fooly regulated?
Reply by ●February 16, 20072007-02-16
On Fri, 16 Feb 2007 14:18:55 -0500, CBFalconer <cbfalconer@yahoo.com> Gave us:> >All it takes is an infinite capacity capacitor. The turn-on time >and inrush current may be high. However it avoids the need for a >UPS. Once they get the breakdown voltage up and get them into >production we can have all the electric cars we want, and dispense >with all batteries.You ain't real bright. You must have been daydreaming about perpetual motion when the instructor covered this subject.
Reply by ●February 16, 20072007-02-16
On Fri, 16 Feb 2007 20:03:52 GMT, Vladimir Vassilevsky <antispam_bogus@hotmail.com> Gave us:>Zero ripple is a real thing.Bullshit. The last supply I designed with our engineering group was for a CAT scanner, and it was EXACTLY 1500 volts, regulated to within one volt, and it had 2mV of ripple. That was AT the switching frequency of 17kHz at the full 250 Watts output. That took a half year and two iterations to achieve. We also made an xray supply that made 4kV at 1.5uA, and that had only 2mV of ripple at rated loading. Linear OR switcher, under full rated load, there IS going to be ripple voltages present. Period. You cannot look at a supply with no load on it, and declare it to be ripple free. You are compiling errant data if you do. Try again, Vlad.
