The capacitor on your photo 2 is in parallel with the battery so it's part of the converter's input supply. The capacitor in the operating principles diagram of the wikipedia article is the converter's output capacitor, which might as well not be there in steady state is there is no load (once charged it just stays charged at a high voltage, and the Boost's diode never conducts-- so the diode might as well not be there either). So everything to the right of the switch in the boost converter diagram could be removed in no load condition, that's why I say the circuit operates like a Boost converter without a load. Which explains why it steps up the input voltage, that's what Boost converters do.
Michel 2010/3/19 Harry Veeder <hlvee...@yahoo.com>: > I'll pass that along. > But the capacitor looks like it is in the wrong place to be a booster > converter with or without a load. > compare photo 2: > http://tinyurl.com/ycw4xm4 > > with operating principles > http://en.wikipedia.org/wiki/Boost_converter > > Harry > > > > > > ----- Original Message ---- >> From: Michel Jullian <michelj...@gmail.com> >> To: vortex-l@eskimo.com >> Sent: Fri, March 19, 2010 4:54:02 AM >> Subject: Re: [Vo]:circuit diagram >> >> 2010/3/19 Harry Veeder < >> href="mailto:hlvee...@yahoo.com";>hlvee...@yahoo.com>: >> Here is a >> reply from Magluvin who is also a member of overunity.com: >> "This is not >> a boost converter > > I said it was a boost converter _without a >> load_. > >> as none of them will recharge the input >> source(cap) >> while being operated. Ive tried. > > This is because he hasn't tried removing >> the load. If you do, in the > course of one oscillation cycle, the input source >> first sources > current, and then sinks current. Note there is a hidden >> component in > the circuit which is important to understand where the >> inductor's > current flows to and from in this no load operation, that's >> the > MOSFET's output capacitance. The IRF640's antiparallel diode >> is > another hidden component which plays an important role, it prevents > the >> drain voltage from going below zero. > > Michel > >> And you wont find >> any >> dc/dc converters with magnets on the coil core. ;]" >> >> >> Harry >> >> >> > > > __________________________________________________________________ > Looking for the perfect gift? Give the gift of Flickr! > > http://www.flickr.com/gift/ > >
