40-60 WATTS ----- Original Message ----- From: "Mike Hagen" To: "Microcontroller discussion list - Public." Sent: Sunday, January 15, 2006 11:45 AM Subject: Re: [OT] DC-DC Voltage Converter - How to start > Yes, I agree with Denny. > > Try a switching supply for 110-220. They make DC out of the AC in and > then > convert it down. > Try finding a 40-60 one that outputs 15 Volts (or 12 and trim it up)? The > 110V mode usually goes down near 90-95 V? > You can even take the metal cover off and bypass the full wave rectifier > (to > save voltage drop) or tweek the output voltage. Jameco has a lot to look > it? > > Mike, WA6ISP > > ----- Original Message ----- > From: "Denny Esterline" > To: "Microcontroller discussion list - Public." > Sent: Sunday, January 15, 2006 11:09 AM > Subject: Re: [OT] DC-DC Voltage Converter - How to start > > >>> Here asking for some help in the design of a DC to DC Converter. >>> I have a solar panel with 96 to 100 VDC @ 1.1Ah without load, break >>> point at 97 VDC and down to 60 VDC @ 0.9 Ah with load. >>> >>> The idea is to make a DC-DC converter from an input of 97 to 60 VDC to >>> an output of 14 VDC more or less at 3Ah, this output will be used to >>> charge a battery system. >>> >>> Can be possible to do this converter without any inductive device? >> >> Not effectively, but if the question is "is it possible to build a DC-DC >> converter without inductors" the answer is yes. Switched capacitor >> converters are commonly used for small boost converters (think MAX232). I >> guess it would be _possible_ to reverse the general process, that is >> charge >> several capacitors in series and discharge them in parallel. But I've >> never >> seen a switched capacitor converter rated for more than a few milliamps. >> So >> yes, it's _possible_, but I can't recommend it. >> >> >> Here's an off the wall idea- what about a regular switch mode wall wart / >> power brick? The one running my LCD monitor as I type this is rated as 4 >> A >> @ >> 12V output, 90-240V AC input. Granted that's an AC input but the way >> these >> things work is they rectify and filter the input voltage before it goes >> to >> the switching stage. If you just tapped the output of your panel to the >> internal HV DC rail... >> 60V with full load is a little low, but it's worth a try >> >> -Denny >> >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> >> > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist