{"id":805,"date":"2021-10-01T05:09:15","date_gmt":"2021-10-01T05:09:15","guid":{"rendered":"https:\/\/www.wehopower.com\/?post_type=news&#038;p=805"},"modified":"2026-10-19T12:01:43","modified_gmt":"2026-10-19T04:01:43","slug":"history-of-switch-mode-power-supplies-smps","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/fa\/news\/history-of-switch-mode-power-supplies-smps\/","title":{"rendered":"\u062a\u0627\u0631\u06cc\u062e\u0686\u0647 \u0645\u0646\u0627\u0628\u0639 \u062a\u063a\u0630\u06cc\u0647 \u062d\u0627\u0644\u062a \u0633\u0648\u0626\u06cc\u0686 (SMPS)"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0641\u0647\u0631\u0633\u062a \u0645\u0637\u0627\u0644\u0628<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"\u062a\u063a\u06cc\u06cc\u0631 \u0648\u0636\u0639\u06cc\u062a \u0641\u0647\u0631\u0633\u062a \u0645\u0637\u0627\u0644\u0628\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">\u062a\u063a\u06cc\u06cc\u0631 \u0648\u0636\u0639\u06cc\u062a \u062f\u0647\u06cc\u062f<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.wehopower.com\/fa\/news\/history-of-switch-mode-power-supplies-smps\/#Ower_Supplies_%E2%80%93_just_how_far_have_we_come\" >Ower Supplies &#8211; just how far have we come?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.wehopower.com\/fa\/news\/history-of-switch-mode-power-supplies-smps\/#Technological_Advancement\" >Technological Advancement?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.wehopower.com\/fa\/news\/history-of-switch-mode-power-supplies-smps\/#Calculating_Power\" >Calculating Power<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.wehopower.com\/fa\/news\/history-of-switch-mode-power-supplies-smps\/#Cooling_Off_in_the_70s_and_80s\" >Cooling Off in the &#8217;70s and &#8217;80s?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.wehopower.com\/fa\/news\/history-of-switch-mode-power-supplies-smps\/#EU_Shakeup\" >EU Shakeup<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Ower_Supplies_%E2%80%93_just_how_far_have_we_come\"><\/span>Ower Supplies &#8211; just how far have we come?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-809\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2021\/11\/History-Of-Switch-Mode-Power-Supplies-SMPS-scaled.jpg?quality=85&#038;strip=all\" alt=\"History Of Switch Mode Power Supplies (SMPS)  title=\" width=\"800\" height=\"426\" history of switch mode power supplies title=\"\" srcset=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2021\/11\/History-Of-Switch-Mode-Power-Supplies-SMPS-scaled.jpg 2560w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2021\/11\/History-Of-Switch-Mode-Power-Supplies-SMPS-300x160.jpg 300w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2021\/11\/History-Of-Switch-Mode-Power-Supplies-SMPS-1024x546.jpg 1024w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2021\/11\/History-Of-Switch-Mode-Power-Supplies-SMPS-768x409.jpg 768w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2021\/11\/History-Of-Switch-Mode-Power-Supplies-SMPS-1536x818.jpg 1536w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2021\/11\/History-Of-Switch-Mode-Power-Supplies-SMPS-2048x1091.jpg 2048w, https:\/\/www.wehopower.com\/wp-content\/uploads\/2021\/11\/History-Of-Switch-Mode-Power-Supplies-SMPS-1568x836.jpg 1568w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>Switch-mode power supply technology has developed over the years, particularly in efficiency and power density. More compact power conversion can help equipment designers make better use of limited enclosure space.<\/p>\n<p>Compare power density using the exact model, operating load and thermal conditions rather than transferring the rating of one historical product to another.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Technological_Advancement\"><\/span>Technological Advancement?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Early switch-mode power-supply development in the 1950s involved both vacuum-tube and transistor-based concepts. Rather than assigning a single first invention, this overview follows the technical move toward smaller and more efficient power conversion.<\/p>\n<p>With this influx of technological advancement, designers were suddenly able to pick and choose from multiple components and multiple manufacturers, giving them an unprecedented number of options and potentially groundbreaking designs.<\/p>\n<p>The focus of this intensive period of development was the traditional linear regulator \u2013 the brightest minds were trying to figure out how they could replace the outdated transformer and resistance method of changing input voltage with a more efficient design.<\/p>\n<p>The idea they landed on used a transistor to chop the input voltage up with an average value less than the initial input (we have a fantastic store of technical articles here on the site if you\u2019d like a more detailed description of SMPS operation).<\/p>\n<p>With higher efficiency and fewer magnetic materials required, the new technology was smaller, lighter and generated less heat.<\/p>\n<p>As with modern inventions with those characteristics, this 1950s solution was hugely appealing to businesses in a range of sectors \u2013 from electronics to aerospace and communications to computing, there was a flood of early adopters each jockeying to make the best use of this new power supply technology.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Calculating_Power\"><\/span>Calculating Power<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>During the 1970s, switching power conversion became useful in compact electronic equipment, where reducing power-supply size and weight mattered.<\/p>\n<p>The same design priorities apply to computing equipment: a more efficient power stage can reduce transformer size, heat dissipation and the space required for cooling.<\/p>\n<p>Similarly, aerospace manufacturers considering how they could save weight and space also began looking towards custom switching power supplies to create much more efficient designs.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cooling_Off_in_the_70s_and_80s\"><\/span>Cooling Off in the &#8217;70s and &#8217;80s?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The 1970s was a busy decade once the initial breakthrough had been made and innovation continued at a very respectable pace. Several companies in UK, USA and Japan began to market standard power supply products.<\/p>\n<p>Claims about who first commercialized the technology vary; this overview does not assign a single originator.<\/p>\n<p>The electronics press of the era featured SMPS articles and advertisements as standard products became more widely available. Open-frame, enclosed and modular designs gave equipment builders alternatives to custom linear power stages.<\/p>\n<p>The adoption of switching power supplies in personal computers helped designers pursue smaller and lighter systems. Cooling still depended on total losses, enclosure conditions and component limits: some designs relied on convection, while others used fans, including fan-cooled ATX-style arrangements.<\/p>\n<p>In the late 1980s and early part of the 1990s, industry-standard 3 x 5\u201d power supplies became available with an auto-ranging input that sensed whether it was connected to 120VAC or 230VAC and adjusted accordingly. These products had powers of 25 \u2013 40W, or 1.66 to 2.66W\/In2<\/p>\n<h3><span class=\"ez-toc-section\" id=\"EU_Shakeup\"><\/span>EU Shakeup<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>As more and more companies entered the market, some loose industry standards appeared around common sizes like 3&#215;5\u201d. Power densities began to improve as advances in magnetics, switching transistors and controller ICs progressed. These changes offered higher efficiencies and made better power densities possible.<\/p>","protected":false},"excerpt":{"rendered":"<p>Ower Supplies &#8211; just how far have we come? Switch-mode power supply technology has developed over the years, particularly in efficiency and power density. More compact power conversion can help equipment designers make better use of limited enclosure space. Compare power density using the exact model, operating load and thermal conditions rather than transferring the&hellip; <a class=\"more-link\" href=\"https:\/\/www.wehopower.com\/fa\/news\/history-of-switch-mode-power-supplies-smps\/\">\u0628\u0647 \u062e\u0648\u0627\u0646\u062f\u0646 \u0627\u062f\u0627\u0645\u0647 \u062f\u0647\u06cc\u062f <span class=\"screen-reader-text\">\u062a\u0627\u0631\u06cc\u062e\u0686\u0647 \u0645\u0646\u0627\u0628\u0639 \u062a\u063a\u0630\u06cc\u0647 \u062d\u0627\u0644\u062a \u0633\u0648\u0626\u06cc\u0686 (SMPS)<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":809,"parent":0,"menu_order":703,"comment_status":"open","ping_status":"open","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[149,148],"class_list":["post-805","news","type-news","status-publish","format-standard","has-post-thumbnail","hentry","news_category-blog","news_category-industry-news","entry"],"acf":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/news\/805","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/comments?post=805"}],"version-history":[{"count":1,"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/news\/805\/revisions"}],"predecessor-version":[{"id":19588,"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/news\/805\/revisions\/19588"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/media\/809"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/media?parent=805"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/fa\/wp-json\/wp\/v2\/news_category?post=805"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}