Even though i did a patent no. 6,218,812 solid state high frequency battery charger, I still think the best (cheapest and most reliable) solution for most EV's is the ferro transformer, it has everything if set up correctly for the IEI charge & dv/dt=0 curve (wind the sec for C/40 on final charge taper):
Isolation Voltage Regulation Current Regulation Excellent Power factor (about .95) Reliable as a rock, Lasts Forever ----- Original Message ----- From: "Richard Furniss" <[EMAIL PROTECTED]> To: "EV List" <[EMAIL PROTECTED]> Sent: Wednesday, October 16, 2002 12:54 PM Subject: Re: Battery Charger > > ----- Original Message ----- > From: "Lee Hart" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Sunday, October 13, 2002 10:44 PM > Subject: Re: Battery Charger > > > > Richard Furniss wrote: > > > > > I thought the ferroresonant transformer in a Lester charger was for > > > power factor correction, if I raise the AC input voltage by 10v RMS > > > will the DC output voltage not raise accordingly? > > > > No, the ferroresonant transformer is use for voltage regulation. Output > > voltage typically changes less that 2% for a 10% change in input > > voltage. That means changing the input voltage has very little effect on > > output voltage. > > > > Ferroresonant transformer action also has the side effect of improving > > the power factor, but that is not its main purpose. > > -- > > Lee A. Hart Ring the bells that still can ring > > 814 8th Ave. N. Forget your perfect offering > > Sartell, MN 56377 USA There is a crack in everything > > leeahart_at_earthlink.net That's how the light gets in - Leonard Cohen > > > > Thanks for the clarification, I can see where the ferroresonant > transformer would be great for a charger, so if I understand correctly the > compensating windings that is connected to the four caps primary purpose is > to > compensate or stabilize the input voltage and the PF correction is just a > bonus. > > I have been looking for a constant current power supply to equalize the > two different battery packs 36v and 48v, but nothing yet. > > Has anybody seen a bench power supply that will fit the need >64v and >6 > amps. > > www.lasvegasev.com > Richard Furniss > Las Vegas, NV > 1986 Mazda EX-7 192v > 1981 Lectra Centauri 108v > 3 Wheel Trail Master 12v > Board Member, www.lveva.org > Las Vegas Electric Vehicle Association > >
