tag:blogger.com,1999:blog-7063183727921268380.post6422260318066711743..comments2024-02-29T06:14:25.154+01:00Comments on TT7 High Altitude Balloon: The Solar ExperimentsTT7http://www.blogger.com/profile/11095378058232471221noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-7063183727921268380.post-614616982983981162018-02-06T15:30:21.842+01:002018-02-06T15:30:21.842+01:00That's a useful tip, Mike. Thanks.That's a useful tip, Mike. Thanks.TT7https://www.blogger.com/profile/11095378058232471221noreply@blogger.comtag:blogger.com,1999:blog-7063183727921268380.post-84314859038916890142018-02-06T09:00:03.501+01:002018-02-06T09:00:03.501+01:00regaring the MCP1640, I have had the same experian...regaring the MCP1640, I have had the same experiance with those inductor based boost regulators, that they require high, about 300-400mA startup curent, one easy way to get around this problem is to tie the enable pin to gnd via a ca 100k resitor and then put 2 or 3 diodes in series from vin (to be subistituded with suitable zener) enabling the regulator when there is enought voltage/current from the panels, my regulator just smothly rices in current when the volatge rising getting over the voltage threshold set by the diodes/zener. I´m using the tlv61225, its just the same as the mcp1640 just pre set to 3,3v so no resistor needed for the v out setting.Mikael - SA6BSShttps://www.blogger.com/profile/13814619979576340800noreply@blogger.comtag:blogger.com,1999:blog-7063183727921268380.post-39107680746608413542017-03-17T14:31:01.761+01:002017-03-17T14:31:01.761+01:00Interesting. If I understand your findings correct...Interesting. If I understand your findings correctly, at low solar irradiation LTC3105 produces only short pulses. That would explain why I measured increasing voltage at the battery with very little current in my last example. The way I measured it simply couldn't detect such short pulses. Good job!TT7https://www.blogger.com/profile/11095378058232471221noreply@blogger.comtag:blogger.com,1999:blog-7063183727921268380.post-76031672017883205372017-03-10T15:18:02.820+01:002017-03-10T15:18:02.820+01:00It's cool! Finally I found your project using ...It's cool! Finally I found your project using LTC3105. It helped me a lot. Thank you!<br />I had to study the work of 3105 more to customize the MPPC. It turned out that when the lighting poor, 3015 works cyclically, adding in the battery charge current pulses.<br />You can found the 3105 work waveforms here http://radiokot.ru/forum/viewtopic.php?p=3034652#p3034652Anonymoushttps://www.blogger.com/profile/03475996051328983846noreply@blogger.com