{"id":7363,"date":"2024-12-07T13:39:47","date_gmt":"2024-12-07T05:39:47","guid":{"rendered":"https:\/\/www.wehopower.com\/?post_type=news&#038;p=7363"},"modified":"2026-11-04T21:57:20","modified_gmt":"2026-11-04T13:57:20","slug":"is-the-power-supply-and-the-transformer-the-same-thing-a-deep-dive-for-smps-enthusiasts","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/ko\/news\/is-the-power-supply-and-the-transformer-the-same-thing-a-deep-dive-for-smps-enthusiasts\/","title":{"rendered":"Is the Power Supply and the Transformer the Same Thing? A Deep Dive for SMPS Enthusiasts"},"content":{"rendered":"<p>No. A power supply delivers electrical power in the form required by a load; a transformer is a magnetic component that transfers energy between windings. Many switched-mode power supplies (SMPS) contain a transformer, but some converters use other topologies without one. A transformer by itself does not generally provide regulated DC output.<\/p>\n<p>The distinction matters when an engineer or buyer is choosing a complete power supply or specifying a component for a power-supply design.<\/p>\n<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\">\ubaa9\ucc28<\/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=\"\ubaa9\ucc28 \ud1a0\uae00\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">\ube44\ub140\uc7a5<\/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\/ko\/news\/is-the-power-supply-and-the-transformer-the-same-thing-a-deep-dive-for-smps-enthusiasts\/#Understanding_the_Power_Supply\" >Understanding the Power Supply<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.wehopower.com\/ko\/news\/is-the-power-supply-and-the-transformer-the-same-thing-a-deep-dive-for-smps-enthusiasts\/#The_Role_of_the_Transformer\" >The Role of the Transformer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.wehopower.com\/ko\/news\/is-the-power-supply-and-the-transformer-the-same-thing-a-deep-dive-for-smps-enthusiasts\/#The_Interdependence\" >The Interdependence<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.wehopower.com\/ko\/news\/is-the-power-supply-and-the-transformer-the-same-thing-a-deep-dive-for-smps-enthusiasts\/#Choosing_the_Right_Device\" >Choosing the Right Device<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.wehopower.com\/ko\/news\/is-the-power-supply-and-the-transformer-the-same-thing-a-deep-dive-for-smps-enthusiasts\/#Conclusion\" >\uacb0\ub860<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"understanding-the-power-supply\"><span class=\"ez-toc-section\" id=\"Understanding_the_Power_Supply\"><\/span>Understanding the Power Supply<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A power supply converts electrical power from one form to another. For example, an AC\/DC supply may convert the AC line input into regulated DC for electronic equipment. DC\/DC converters and DC\/AC inverters perform different conversions, so the input and output must be checked for the particular product.<\/p>\n<p>In a typical isolated AC\/DC switching supply, the conversion may involve:<\/p>\n<ul>\n<li><strong>\uc815\ub958:<\/strong> converting the AC input to pulsating DC.<\/li>\n<li><strong>\ud544\ud130\ub9c1:<\/strong> smoothing the rectified voltage and reducing unwanted ripple.<\/li>\n<li><strong>Switching and magnetic conversion:<\/strong> using switching devices and a magnetic component to transfer energy.<\/li>\n<li><strong>Output rectification and filtering:<\/strong> producing the DC output from the switching waveform.<\/li>\n<li><strong>Regulation and protection:<\/strong> controlling the output and providing the protection functions specified for that model.<\/li>\n<\/ul>\n<p>The exact topology and available protections vary by design. Regulation holds the output within specified limits under stated conditions; it does not mean the output never changes or that connected equipment is protected under every fault.<\/p>\n<figure class=\"article-figure\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2024\/12\/2024120701.png\" alt=\"Is the Power Supply and the Transformer the Same Thing? A Deep Dive for SMPS Enthusiasts  title=\" width=\"1269\" height=\"793\" is the power supply and transformer same a deep dive for smps enthusiasts title =\"\"><figcaption>Existing article image showing a switching power supply circuit board; the picture is illustrative and does not establish the topology of every product.<\/figcaption><\/figure>\n<h2 id=\"the-role-of-the-transformer\"><span class=\"ez-toc-section\" id=\"The_Role_of_the_Transformer\"><\/span>The Role of the Transformer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A transformer is a passive magnetic component with windings coupled by a changing magnetic field. A changing voltage applied to a winding produces changing magnetic flux, which induces a voltage in another winding. Transformer construction, winding arrangement and insulation determine how the component can be used.<\/p>\n<figure class=\"article-figure\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2024\/12\/2024120702.png\" alt=\"Is the Power Supply and the Transformer the Same Thing? A Deep Dive for SMPS Enthusiasts  title=\" width=\"927\" height=\"820\" is the power supply and transformer same a deep dive for smps enthusiasts title =\"\"><figcaption>Existing article close-up of a power supply circuit board; component details and product specifications should be verified separately.<\/figcaption><\/figure>\n<p>The key functions of a transformer within a power supply can include:<\/p>\n<ul>\n<li><strong>Voltage transformation:<\/strong> providing a turns ratio suited to the power-conversion design. In a switching converter, the final DC output also depends on topology and control; turns ratio alone does not establish the regulated output.<\/li>\n<li><strong>Isolation:<\/strong> separate, suitably insulated windings can form a galvanic isolation barrier. The required safety classification depends on the complete design, insulation system and applicable approvals; a transformer alone does not guarantee safe touch or prevent every fault.<\/li>\n<li><strong>Multiple outputs:<\/strong> separate secondary windings can support multiple output circuits where the design calls for them.<\/li>\n<li><strong>Impedance transformation:<\/strong> a transformer can reflect impedance between windings in applications that require it.<\/li>\n<\/ul>\n<p>In an SMPS, a high-frequency magnetic component can be smaller than a line-frequency transformer of comparable function, although size depends on the design and operating conditions. In a flyback converter, the coupled magnetic component stores energy during part of the switching cycle and transfers it during another part. Other topologies transfer energy differently; energy storage is not the same in every transformer-based converter. See <a href=\"https:\/\/www.analog.com\/en\/resources\/technical-articles\/isolated-switch-mode-power-supplies-forward-vs-flyback.html\" target=\"_blank\" rel=\"noopener\">Analog Devices&#x27; explanation of flyback and forward converters<\/a>.<\/p>\n<h2 id=\"the-interdependence\"><span class=\"ez-toc-section\" id=\"The_Interdependence\"><\/span>The Interdependence<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>While distinct, the power supply and the transformer are closely related within an isolated SMPS. The transformer&#x27;s characteristics\u2014including turns ratio, core material, winding resistance and leakage inductance\u2014affect the converter&#x27;s losses, regulation and power-handling design.<\/p>\n<p>Conversely, the power supply&#x27;s control circuitry and topology determine the transformer&#x27;s operating conditions. Switching frequency, duty cycle and current waveforms affect losses, temperature rise and saturation. A non-isolated buck or boost converter may use an inductor instead of an isolation transformer, so the presence or absence of a transformer depends on the topology.<\/p>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th scope=\"col\">Question<\/th>\n<th scope=\"col\">\ubcc0\uc2e0 \ub85c\ubd07<\/th>\n<th scope=\"col\">Power supply<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>What is it?<\/td>\n<td>A magnetic component with coupled windings<\/td>\n<td>A device or system that supplies power to a load<\/td>\n<\/tr>\n<tr>\n<td>Main role<\/td>\n<td>Transfer energy between windings and provide a suitable voltage ratio; isolation depends on construction<\/td>\n<td>Convert the available input into the output required by the load<\/td>\n<\/tr>\n<tr>\n<td>DC output<\/td>\n<td>A transformer alone does not rectify or regulate its output<\/td>\n<td>An AC\/DC supply can provide a DC output within its specified conditions<\/td>\n<\/tr>\n<tr>\n<td>Selection checks<\/td>\n<td>Voltage, frequency, current, insulation and construction<\/td>\n<td>Input and output ratings, regulation, protection, isolation, environment and approvals<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2 id=\"choosing-the-right-device\"><span class=\"ez-toc-section\" id=\"Choosing_the_Right_Device\"><\/span>Choosing the Right Device<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For an equipment input that requires regulated DC, start with its specified voltage, current and tolerances, then check the supply&#x27;s input range, output rating, operating temperature, installation requirements and applicable safety documentation. Do not connect the output of a bare AC transformer directly to a load requiring regulated DC unless the equipment manufacturer explicitly specifies that arrangement.<\/p>\n<p>\uadf8\ub9cc\ud07c <a href=\"https:\/\/www.wehopower.com\/ko\/product\/lrs-series-250w-ac-to-dc-single-output-switching-power-supply\/\">WEHO LRS-250-24 AC\/DC switching power supply product page<\/a> is an example of a complete power supply rather than a standalone transformer. Check the exact output model and current documentation before deciding whether it is suitable for your load; the product page does not establish the internal topology of every model.<\/p>\n<figure class=\"article-figure\"><a href=\"https:\/\/www.wehopower.com\/ko\/product\/lrs-series-250w-ac-to-dc-single-output-switching-power-supply\/\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2024\/12\/weho-lrs-250-24-product-reference.webp\" alt=\"Is the Power Supply and the Transformer the Same Thing? A Deep Dive for SMPS Enthusiasts  title=\" width=\"800\" height=\"800\" is the power supply and transformer same a deep dive for smps enthusiasts title =\"\"><\/a><figcaption>WEHO LRS-250-24 product photograph, shown as an example of a complete power supply; check the exact model documentation before selection.<\/figcaption><\/figure>\n<h2 id=\"conclusion\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>\uacb0\ub860<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A power supply and a transformer are not the same thing. A power supply is a complete device or system that supplies power to a load, while a transformer is a magnetic component used in many\u2014but not all\u2014power-conversion designs.<\/p>\n<p>The transformer&#x27;s properties and the power supply&#x27;s control circuitry interact in transformer-based designs. Understanding both helps engineers and buyers compare the complete system&#x27;s electrical and installation requirements.<\/p>\n<p><a href=\"https:\/\/www.wehopower.com\/ko\/contact\/\">WEHO\uc5d0 \ubb38\uc758\ud558\uc138\uc694<\/a> with the available input, required output, load and operating environment to discuss a suitable power supply.<\/p>","protected":false},"excerpt":{"rendered":"<p>No. A power supply delivers electrical power in the form required by a load; a transformer is a magnetic component that transfers energy between windings. Many switched-mode power supplies (SMPS) contain a transformer, but some converters use other topologies without one. A transformer by itself does not generally provide regulated DC output. The distinction matters&hellip; <a class=\"more-link\" href=\"https:\/\/www.wehopower.com\/ko\/news\/is-the-power-supply-and-the-transformer-the-same-thing-a-deep-dive-for-smps-enthusiasts\/\">\uacc4\uc18d \uc77d\uae30 <span class=\"screen-reader-text\">Is the Power Supply and the Transformer the Same Thing? A Deep Dive for SMPS Enthusiasts<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":7210,"parent":0,"menu_order":615,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[149,148],"class_list":["post-7363","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\/ko\/wp-json\/wp\/v2\/news\/7363","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/ko\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/ko\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/ko\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/ko\/wp-json\/wp\/v2\/comments?post=7363"}],"version-history":[{"count":3,"href":"https:\/\/www.wehopower.com\/ko\/wp-json\/wp\/v2\/news\/7363\/revisions"}],"predecessor-version":[{"id":20809,"href":"https:\/\/www.wehopower.com\/ko\/wp-json\/wp\/v2\/news\/7363\/revisions\/20809"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/ko\/wp-json\/wp\/v2\/media\/7210"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/ko\/wp-json\/wp\/v2\/media?parent=7363"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/ko\/wp-json\/wp\/v2\/news_category?post=7363"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}