https://wiki.cusf.co.uk/index.php?action=history&feed=atom&title=Strix_PSU 2026-05-31T23:37:08Z Revision history for this page on the wiki MediaWiki 1.36.1 https://wiki.cusf.co.uk/index.php?title=Strix_PSU&diff=672&oldid=prev 2021-11-24T23:48:28Z

<p>Add more testing records</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en-GB"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 23:48, 24 November 2021</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l24">Line 24:</td> <td colspan="2" class="diff-lineno">Line 24:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==== Charger Testing ====</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==== Charger Testing ====</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* Male to male DuPont jumpers were soldered to the charger input of the board.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* Male to male DuPont jumpers were soldered to the charger input of the board<ins style="font-weight: bold; text-decoration: none;">. These jumpers were connected to a benchtop PSU at variable voltage from 8.9 (8.4 + 0.5) - 22V to simulate charger input.</ins></div></td></tr> <tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">**Output voltage over both cells ranged from approx 8.2-8.4V, as per specification.</ins></div></td></tr> <tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">**Slight anomalous voltage measured over the pack at 8.6V, noted but no adverse affects observed.</ins></div></td></tr> <tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">**After a short period of charging, the pack voltage was measured to be 9V - this is above the expected 8.4V and a cause for concern.</ins></div></td></tr> <tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">***Cells were noticeably warm after charging.</ins></div></td></tr> <tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">***Board was hot to the touch during charging, especially the inductor.</ins></div></td></tr> <tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*Charging needs to be investigated in further detail tomorrow - some weird behaviour seen from benchtop PSU, and charging from lead-acid battery needs testing.</ins></div></td></tr> <tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr> <tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">=== Day 2: 23/11/21 ===</ins></div></td></tr> <tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr> <tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">=== Day 3: 24/11/21 ===</ins></div></td></tr> <tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Henry gives up</ins>.</div></td></tr> <!-- diff cache key wiki-wiki_:diff::1.12:old-671:rev-672 --> </table>

HenryFranks https://wiki.cusf.co.uk/index.php?title=Strix_PSU&diff=671&oldid=prev 2021-11-24T23:24:44Z

<p>Add basic details</p> <p><b>New page</b></p><div>The Strix PSU is a test board created to test both the new PSU chips (required due to the chip shortage) and test the process of creating a board from scratch, post-COVID. Project files can be found on [https://github.com/cuspaceflight/battery GitHub].<br /> <br /> == Background ==<br /> The Strix PSU is a prototype for the proposed [[Project Strix]] (Martlet IV) power supply, and as such is required to be compact, rechargeable, and store a high energy density.<br /> <br /> The core architecture is a 2S Li-Ion battery pack, connected to a balancer, charger, and two voltage regulators. The regulators create 3.3V and 1.8V voltage outputs at up to 300mA, to accomodate a large safety factor over the power budget of the proposed Strix subsystems. The system is designed to be recharged by a 12V lead-acid battery - so that the avionics system can be recharged on the pad.<br /> <br /> === Li-Ion Battery Charging ===<br /> There are two key phases to Li-Ion battery charging: the constant current and constant voltage regimes.<br /> <br /> == Experimental Testing Log ==<br /> <br /> === Day 1: 22/11/21 ===<br /> <br /> ==== Initial Testing ====<br /> <br /> * Cheap DuPont jumper wires were soldered up to the underside of the right-angle headers to make connections easily in lieu of actually buying receptables and crimps.<br /> ** Male to male connectors were attached to the battery, 3v3, and 1v8 connectors on the board.<br /> ** Male to female connectors were attached to the cells themselves.<br /> * Regulator outputs were tested with multimeter, correct voltages measured.<br /> * VBatt measured at 7.9V, within spec.<br /> * Regulators and board temp were measured with fingers, warm to the touch but no burning.<br /> <br /> ==== Charger Testing ====<br /> <br /> * Male to male DuPont jumpers were soldered to the charger input of the board.</div>

HenryFranks