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12V 7AH SLA Low Voltage Disconnect - Revision history
2024-03-29T14:08:22Z
Revision history for this page on the wiki
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Craig Peacock: /* Design Files */
2017-06-17T12:29:52Z
<p><span dir="auto"><span class="autocomment">Design Files</span></span></p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 12:29, 17 June 2017</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Open source design files for the 12V 7AH SLA Low Voltage Disconnect can be obtained from [https://circuitmaker.com/Projects/Details/Craig-Peacock-4/12V-7Ah-SLA-Low-Voltage-Disconnect Circuit Maker]. Circuit Maker is a free PCB design tool from Altium. Designs can be imported into Altium Designer.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Open source design files for the 12V 7AH SLA Low Voltage Disconnect can be obtained from [https://circuitmaker.com/Projects/Details/Craig-Peacock-4/12V-7Ah-SLA-Low-Voltage-Disconnect Circuit Maker]. Circuit Maker is a free PCB design tool from Altium. Designs can be imported into Altium Designer.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; 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;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; 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;">A PDF version of the schematic can be obtained [http://wiki.beyondlogic.org/downloads/MAX8212_12V_7Ah_SLA_Low_Voltage_Disconnect.pdf here].</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Description ==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Description ==</div></td></tr>
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Craig Peacock
//wiki.beyondlogic.org/index.php?title=12V_7AH_SLA_Low_Voltage_Disconnect&diff=668&oldid=prev
Craig Peacock at 12:26, 17 June 2017
2017-06-17T12:26:57Z
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 12:26, 17 June 2017</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The 102k/953k/86.6k voltage divider sets a low voltage cutout at 11.9V and a reset high threshold of 12.87V.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The 102k/953k/86.6k voltage divider sets a low voltage cutout at 11.9V and a reset high threshold of 12.87V.</div></td></tr>
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<tr><td class='diff-marker'>−</td><td style="color:black; 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>Three printed circuit boards fabricated by [https://oshpark.com/shared_projects/todZaEfL OSH Park costs $11.15] and the BOM cost is approximately $12.15 from Digikey.</div></td><td class='diff-marker'>+</td><td style="color:black; 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>Three printed circuit boards fabricated by [https://oshpark.com/shared_projects/todZaEfL OSH Park costs $11.15] and the <ins class="diffchange diffchange-inline">[http://wiki.beyondlogic.org/downloads/MAX8212_12V_7Ah_SLA_Low_Voltage_Disconnect_BOM.xlsx </ins>BOM cost<ins class="diffchange diffchange-inline">] </ins>is approximately $12.15 from Digikey.</div></td></tr>
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Craig Peacock
//wiki.beyondlogic.org/index.php?title=12V_7AH_SLA_Low_Voltage_Disconnect&diff=667&oldid=prev
Craig Peacock at 12:21, 17 June 2017
2017-06-17T12:21:45Z
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 12:21, 17 June 2017</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Design Files ==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>== Design Files ==</div></td></tr>
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Craig Peacock
//wiki.beyondlogic.org/index.php?title=12V_7AH_SLA_Low_Voltage_Disconnect&diff=666&oldid=prev
Craig Peacock: Initial Page
2017-06-17T12:17:11Z
<p>Initial Page</p>
<p><b>New page</b></p><div><br />
== Design Files ==<br />
<br />
Open source design files for the 12V 7AH SLA Low Voltage Disconnect can be obtained from [https://circuitmaker.com/Projects/Details/Craig-Peacock-4/12V-7Ah-SLA-Low-Voltage-Disconnect Circuit Maker]. Circuit Maker is a free PCB design tool from Altium. Designs can be imported into Altium Designer.<br />
<br />
== Description ==<br />
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A basic, no-frills low voltage cut-out for 12V, 7Ahr Sealed Lead Acid Batteries.<br />
<br />
Using two [http://www.keyelco.com/product.cfm/product_id/682 Keystone 3571] female PCB terminals, this PCB assembly attaches directly to the terminals of a 12V 7AH SLA Battery with 4.75mm Spade Terminals.<br />
<br />
The Maxim Integrated [https://www.maximintegrated.com/en/products/power/supervisors-voltage-monitors-sequencers/MAX8212.html MAX8212] Micropower Voltage Comparator with 1.15V reference switches a high side [http://www.infineon.com/cms/en/product/power/mosfet/20v-650v-automotive-mosfet/20v-150v-p-channel-automotive-mosfet/IPD90P03P4L-04/productType.html?productType=db3a30441689f4830116c8d4223c1d4f P-Channel MOSFET] to disconnect the load. The MOSFET has a low on resistance of 4.1mOhms and a maximum current capability of 90 Amps well exceeding that of the battery.<br />
<br />
The MAX8212 can operate with a programmable threshold and hysteresis (Populate R3/R6/R7) ensuring the load doesn't oscillate when the low voltage trip point is reached and the battery terminal voltage rises. However, if this behaviour is not desirable, this circuit also allows the low voltage event to be latched by populating R4/S1/R7 instead, as per Maxim [https://www.maximintegrated.com/en/app-notes/index.mvp/id/926 Application Note 926]. <br />
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When the load is switched off, the MAX8212's 5uA quiescent current ensures the battery is not discharged. <br />
<br />
The 102k/953k/86.6k voltage divider sets a low voltage cutout at 11.9V and a reset high threshold of 12.87V.<br />
<br />
Three printed circuit boards fabricated by [https://oshpark.com/shared_projects/todZaEfL OSH Park costs $11.15] and the BOM cost is approximately $12.15 from Digikey.</div>
Craig Peacock