{"id":210,"date":"2015-02-11T21:16:25","date_gmt":"2015-02-11T19:16:25","guid":{"rendered":"http:\/\/www.simonwyss.me\/blog\/?p=210"},"modified":"2017-02-16T15:03:13","modified_gmt":"2017-02-16T14:03:13","slug":"atx-power-supply-18v-and-30v-modification","status":"publish","type":"post","link":"https:\/\/simonwyss.me\/blog\/?p=210","title":{"rendered":"ATX Power Supply 18V and 30V Modification"},"content":{"rendered":"<div id='gallery-1' class='gallery galleryid-210 gallery-columns-3 gallery-size-thumbnail'><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/simonwyss.me\/blog\/?attachment_id=217'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/20150209_ATX_1-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"ATX DPS-240EP\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/simonwyss.me\/blog\/?attachment_id=218'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/20150209_ATX_2-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"ATX DPS-240EP\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/simonwyss.me\/blog\/?attachment_id=219'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/20150209_ATX_4-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"ATX DPS-240EP\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/simonwyss.me\/blog\/?attachment_id=220'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/20150209_ATX_5-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"ATX DPS-240EP\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/simonwyss.me\/blog\/?attachment_id=221'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/20150209_ATX_6-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"ATX DPS-240EP\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/simonwyss.me\/blog\/?attachment_id=226'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/20150209_ATX_7-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/simonwyss.me\/blog\/?attachment_id=212'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/20150209_ATX_8-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"ATX DPS-240EP\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/simonwyss.me\/blog\/?attachment_id=213'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/20150209_ATX_9-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"ATX DPS-240EP\" \/><\/a>\n\t\t\t<\/div><\/figure>\n\t\t<\/div>\n\n<p>My first attempt to build a power supply capable of 10A @ 30V for my 2x100W Class D-Amp was not successful, because I only reached 10A@ 24V. My next idea was, to modify an ATX-Computer-Power-Supply from 12V to 18V and connect a unmodified (original) ATX-Power-Supply with a modified 18V to reach 30V and 10A.<\/p>\n<p>In this post is the modification from of the ATX-Powersupply to output 10A @ 18V described.<\/p>\n<p><span style=\"color: #ff0000;\">Attention: Don\u2019t modify a Power-Supply if you aren\u2019t trained with Low-Voltage! I don\u2019t guarantee, that the schematic of the Power-Supply is correct! If the Power-Supply is faulty mains-voltage can reach the DC-Output! Capacitors can stay charged to 325V after disconnecting the power-supply from mains-voltage. You do all modifications at your own risk! I am not responsible for damages, fire and injuries!<\/span><\/p>\n<p>Original Schematic of the \u201cDPS-240EP\u201d ATX-Power-Supply (read out from circuit board):<a href=\"http:\/\/www.simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/ATX_DPS-240EP_v5_blog1.pdf\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-222 size-large\" src=\"http:\/\/www.simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/ATX_DPS-240EP_v5_blog-1024x456.png\" alt=\"ATX DPS-240EP\" width=\"640\" height=\"285\" srcset=\"https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/ATX_DPS-240EP_v5_blog-1024x456.png 1024w, https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/ATX_DPS-240EP_v5_blog-300x133.png 300w, https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/ATX_DPS-240EP_v5_blog.png 1362w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><\/a><\/p>\n<p>I did a lot of steps to the final version of the modification. The first idea was, to cheat the control-IC (DNA1002)of the power-supply. Unfortunately I didn\u2019t found a datasheet of this IC. It seems, that it is a custom IC for the power-supply manufacturer \u201cDelta\u201d.\u00a0 From schematic \u201cdrafts\u201d of this IC I recognized the voltage-monitoring pins for 5, 12 and -12V. Next I connected this pins with voltage regulators fix to the needed voltages.<\/p>\n<p>The voltage Regulation of the power-supply is done with a tl431 voltage reference. I replaced the on-board potentiometer with an own and could adjust the 12V rail up to 18V. <span style=\"color: #ff0000;\">Attention<\/span>, before this voltage modification I replaced the old electrolyte capacitors on the 12V rail and 5V rail with 25V and 10V types.<\/p>\n<p>Sadly now the power-on of the circuit didn\u2019t worked proper no more. So I decided to go away from the control circuit DNA1002 and bridge the circuit at the required points. (As I understand the circuit, there is no over current monitoring with shunts. The DNA1002 just monitors the voltage, and in case of an overcurrent [or empty capacitor connected] the voltage drop for a short moment is recognized and the power-supply shut down.<\/p>\n<p><span style=\"color: #ff0000;\">Attention<\/span>, the modification has a very high current limit: The IC UC3845 on the primary side has a 0.18 Ohm shunt, which limits the primary (325V) current to max. 1V over the shunt (1V\/0.18 = 5.5A). The secondary current can be very high (5.5A*325V = 1.78kW !!!). It would be better, if the primary shunt is enhanced to 1 Ohm.<\/p>\n<p>Modified Schematic (modifications in doted circles):<a href=\"http:\/\/www.simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/ATX_DPS-240EP_v5_blog_modified.pdf\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-222\" src=\"http:\/\/www.simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/ATX_DPS-240EP_v5_blog-1024x456.png\" alt=\"ATX DPS-240EP\" width=\"640\" height=\"285\" srcset=\"https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/ATX_DPS-240EP_v5_blog-1024x456.png 1024w, https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/ATX_DPS-240EP_v5_blog-300x133.png 300w, https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/ATX_DPS-240EP_v5_blog.png 1362w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><\/a><\/p>\n<div id='gallery-2' class='gallery galleryid-210 gallery-columns-4 gallery-size-thumbnail'><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/simonwyss.me\/blog\/?attachment_id=216'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/20150209_ATX_optocoupler_1-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Optocouplers\" aria-describedby=\"gallery-2-216\" \/><\/a>\n\t\t\t<\/div>\n\t\t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-2-216'>\n\t\t\t\tOptocouplers\n\t\t\t\t<\/figcaption><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/simonwyss.me\/blog\/?attachment_id=235'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/20150209_ATX_optocoupler_2-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Optocouplers\" aria-describedby=\"gallery-2-235\" \/><\/a>\n\t\t\t<\/div>\n\t\t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-2-235'>\n\t\t\t\tOptocouplers\n\t\t\t\t<\/figcaption><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/simonwyss.me\/blog\/?attachment_id=214'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/20150209_ATX_DNA1002-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"DNA1002\" aria-describedby=\"gallery-2-214\" \/><\/a>\n\t\t\t<\/div>\n\t\t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-2-214'>\n\t\t\t\tDNA1002\n\t\t\t\t<\/figcaption><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/simonwyss.me\/blog\/?attachment_id=215'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/simonwyss.me\/blog\/wp-content\/uploads\/2015\/02\/20150209_ATX_modifications-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Modification tests\" aria-describedby=\"gallery-2-215\" \/><\/a>\n\t\t\t<\/div>\n\t\t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-2-215'>\n\t\t\t\tModification tests\n\t\t\t\t<\/figcaption><\/figure>\n\t\t<\/div>\n\n<p>That I could connect this power-supply with another ATX power-supply in series I removed the connection from the secondary GND to the primary \u201cprotective earth\u201d (PE) (german: Schutzleiter). Attention, if the power-supply is faulty mains voltage on the secondary would no longer kill the fuse!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>My first attempt to build a power supply capable of 10A @ 30V for my 2x100W Class D-Amp was not successful, because I only reached 10A@ 24V. My next idea was, to modify an ATX-Computer-Power-Supply from 12V to 18V and connect a unmodified (original) ATX-Power-Supply with a modified 18V to reach 30V and 10A. In &hellip; <a href=\"https:\/\/simonwyss.me\/blog\/?p=210\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;ATX Power Supply 18V and 30V Modification&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[61,63,64,65,62,66,67],"class_list":["post-210","post","type-post","status-publish","format-standard","hentry","category-electronics","tag-atx-power-supply","tag-atx-power-supply-18v","tag-atx-power-supply-30v","tag-atx-power-supply-dna1002","tag-atx-power-supply-modification","tag-dna1002","tag-dps-240ep"],"_links":{"self":[{"href":"https:\/\/simonwyss.me\/blog\/index.php?rest_route=\/wp\/v2\/posts\/210","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/simonwyss.me\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/simonwyss.me\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/simonwyss.me\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/simonwyss.me\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=210"}],"version-history":[{"count":11,"href":"https:\/\/simonwyss.me\/blog\/index.php?rest_route=\/wp\/v2\/posts\/210\/revisions"}],"predecessor-version":[{"id":227,"href":"https:\/\/simonwyss.me\/blog\/index.php?rest_route=\/wp\/v2\/posts\/210\/revisions\/227"}],"wp:attachment":[{"href":"https:\/\/simonwyss.me\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=210"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/simonwyss.me\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=210"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/simonwyss.me\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=210"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}