{"id":19135,"date":"2026-10-13T14:37:11","date_gmt":"2026-10-13T06:37:11","guid":{"rendered":"https:\/\/www.wehopower.com\/news\/power-supply-current-sharing-droop-oring\/"},"modified":"2026-10-13T14:37:11","modified_gmt":"2026-10-13T06:37:11","slug":"power-supply-current-sharing-droop-oring","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/tr\/news\/power-supply-current-sharing-droop-oring\/","title":{"rendered":"Current Sharing, Droop and ORing: Three Different Power-System Decisions"},"content":{"rendered":"<p>Current sharing decides how parallel supplies divide a load. ORing limits unwanted reverse-current paths between sources. Redundancy asks whether the system can continue after a failure. These are related design decisions, but none automatically proves the other two. Specify the required functions separately before joining DC outputs.<\/p>\n<figure data-image-role=\"application_a\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/01-application-a-70.png?quality=85&strip=all\" alt=\"Current Sharing, Droop and ORing: Three Different Power-System Decisions  title=\" width=\"1536\" height=\"1024\" current droop and oring: three different power-system decisions title =\"\"><figcaption>A robot-cell auxiliary cabinet prepared for power-system integration. Current-sharing and fault-isolation connections are not inferred from this unconnected layout.<\/figcaption><\/figure>\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\">\u0130\u00e7indekiler<\/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=\"\u0130\u00e7indekiler Tablosunu A\u00e7\/Kapat\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Ge\u00e7i\u015f yapmak<\/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\/tr\/news\/power-supply-current-sharing-droop-oring\/#Why_equal_voltage_labels_do_not_ensure_equal_current\" >Why equal voltage labels do not ensure equal current<\/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\/tr\/news\/power-supply-current-sharing-droop-oring\/#Droop_sharing_uses_a_voltage-current_slope\" >Droop sharing uses a voltage-current slope<\/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\/tr\/news\/power-supply-current-sharing-droop-oring\/#What_the_PSP-600-24_interface_actually_tells_us\" >What the PSP-600-24 interface actually tells us<\/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\/tr\/news\/power-supply-current-sharing-droop-oring\/#ORing_controls_backfeed_not_equal_contribution\" >ORing controls backfeed, not equal contribution<\/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\/tr\/news\/power-supply-current-sharing-droop-oring\/#Check_surviving_capacity_not_only_total_installed_capacity\" >Check surviving capacity, not only total installed capacity<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.wehopower.com\/tr\/news\/power-supply-current-sharing-droop-oring\/#Frequently_asked_questions\" >Frequently asked questions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.wehopower.com\/tr\/news\/power-supply-current-sharing-droop-oring\/#Does_an_ORing_module_make_two_supplies_share_equally\" >Does an ORing module make two supplies share equally?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.wehopower.com\/tr\/news\/power-supply-current-sharing-droop-oring\/#Can_I_parallel_any_two_supplies_with_the_same_voltage_label\" >Can I parallel any two supplies with the same voltage label?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.wehopower.com\/tr\/news\/power-supply-current-sharing-droop-oring\/#Does_the_PSP_P_terminal_prove_built-in_redundancy\" >Does the PSP P terminal prove built-in redundancy?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.wehopower.com\/tr\/news\/power-supply-current-sharing-droop-oring\/#Write_an_architecture_brief_for_the_supplier\" >Write an architecture brief for the supplier<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Why_equal_voltage_labels_do_not_ensure_equal_current\"><\/span>Why equal voltage labels do not ensure equal current<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Two supplies marked \u201c24 V\u201d can have slightly different actual setpoints, output characteristics and cable drops. When connected to a common bus, the source with the higher effective voltage can take more of the load. Equal wire lengths alone do not correct every difference in regulation or dynamic response.<\/p>\n<p>Start by deciding whether the aim is increased capacity, reduced loading of each unit, uninterrupted operation after a fault, or some combination. A system that needs both sources to meet its normal load has a different failure requirement from one whose remaining source can carry everything after the other is isolated.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Droop_sharing_uses_a_voltage-current_slope\"><\/span>Droop sharing uses a voltage-current slope<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In a droop-sharing architecture, output voltage intentionally decreases as source current increases. This creates a mechanism for another source to take more current, but the balance depends on the characteristic slopes, setpoints and distribution paths. Active-sharing arrangements instead coordinate compatible supplies through a control mechanism. <a href=\"https:\/\/www.analog.com\/en\/resources\/technical-articles\/2018\/03\/15\/02\/56\/novel-current-sharing-ic-balances-two-supplies-with-ease.html\" target=\"_blank\" rel=\"noopener\">Analog Devices&#8217; current-sharing explanation<\/a> distinguishes these approaches and describes designs that combine sharing with controlled diode behaviour.<\/p>\n<p>Consider a simplified, hypothetical example\u2014not a PSP characteristic. Let source A follow V = 24.1 \u2212 0.05 \u00d7 I<sub>A<\/sub> and source B follow V = 24.0 \u2212 0.05 \u00d7 I<sub>B<\/sub>, with volts and amperes as units. At a common bus and a total 10 A load, the equations give I<sub>A<\/sub> = 6 A and I<sub>B<\/sub> = 4 A. Both reach 23.8 V, yet the currents are not equal.<\/p>\n<p>This example shows why a small setpoint difference matters. The permitted voltage variation at the load and the acceptable sharing imbalance belong in the specification. It is not a recommendation to add arbitrary resistors or deliberately adjust unrelated supplies until they appear to share.<\/p>\n<figure data-image-role=\"product_detail\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/03-product-detail-66.png?quality=85&strip=all\" alt=\"Current Sharing, Droop and ORing: Three Different Power-System Decisions  title=\" width=\"1536\" height=\"1024\" current droop and oring: three different power-system decisions title =\"\"><figcaption>The matching drawing identifies a P current-share connection in the upper row. Multiple lower +V and \u2212V terminals do not constitute separately regulated output channels.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"What_the_PSP-600-24_interface_actually_tells_us\"><\/span>What the PSP-600-24 interface actually tells us<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The original PSP-600-24 has two guarded terminal rows. Its matching drawing identifies the upper-row functions as AC\/L, AC\/N, FG, P for current share, POK, RCG and RC. The lower row provides multiple +V and \u2212V terminals for one DC output, not eight independently regulated channels.<\/p>\n<p>The P connection is relevant evidence of a current-share interface. It is not a complete application instruction. The available sheet does not establish the permitted number of parallel units, share-bus protocol, achievable current balance, required wiring arrangement or whether reverse-current isolation is included. Obtain those details for the supplied revision rather than guessing a connection from the terminal name.<\/p>\n<p>Keep the product evidence consistent too. The original photographed label is +24 V, 25 A, while the public listing and supplied sheet contain differing input, power and dimensional entries. This article therefore does not calculate an approved combined output rating from those records. The order-specific specification must settle the usable rating before a system capacity claim is made.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"ORing_controls_backfeed_not_equal_contribution\"><\/span>ORing controls backfeed, not equal contribution<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>An ORing path uses a diode or an appropriately controlled semiconductor arrangement to restrict reverse current into another source. Depending on the design, one supply can carry most of the load while the other stands ready. That can be valid source selection without being balanced sharing.<\/p>\n<p>Include forward loss, thermal design, reverse blocking behaviour and the intended fault cases. \u201cIdeal diode\u201d describes a controlled function, not a lossless physical component. Hot-swap control is another distinct requirement: controlled insertion into a live bus is not established simply by the presence of ORing. <a href=\"https:\/\/www.analog.com\/en\/resources\/design-notes\/hotswapping-and-oring-ensure-uninterrupted-operation.html\" target=\"_blank\" rel=\"noopener\">Analog Devices&#8217; ORing and hot-swap discussion<\/a> explains the separate roles.<\/p>\n<figure data-image-role=\"engineering_context\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/04-engineering-context-70.png?quality=85&strip=all\" alt=\"Current Sharing, Droop and ORing: Three Different Power-System Decisions  title=\" width=\"1536\" height=\"1024\" current droop and oring: three different power-system decisions title =\"\"><figcaption>Specify balancing, isolation and surviving capacity independently. A system can require all three, but they are not interchangeable names for one feature.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Check_surviving_capacity_not_only_total_installed_capacity\"><\/span>Check surviving capacity, not only total installed capacity<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For a redundant architecture, define the required load after the specified failure and verify that the remaining available sources can carry it under the actual environment. Two hypothetical 10 A sources supporting a 16 A load may provide useful combined capacity, but one surviving 10 A source cannot sustain that same load. Load shedding or additional capacity would be a separate design decision.<\/p>\n<p>Review common failure paths as well: shared input protection, a common connector, cooling failure or a downstream short can affect more than one source. A complete review considers the bus, isolation devices, distribution and monitoring\u2014not just the number of supplies.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Frequently_asked_questions\"><\/span>Frequently asked questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Does_an_ORing_module_make_two_supplies_share_equally\"><\/span>Does an ORing module make two supplies share equally?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Not necessarily. Reverse-current isolation and load balancing are distinct functions. Check whether the particular architecture explicitly supports both.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_I_parallel_any_two_supplies_with_the_same_voltage_label\"><\/span>Can I parallel any two supplies with the same voltage label?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. Use a manufacturer-supported arrangement with compatible revisions and documented current-sharing, protection and installation requirements.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Does_the_PSP_P_terminal_prove_built-in_redundancy\"><\/span>Does the PSP P terminal prove built-in redundancy?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. It identifies a current-share function in the matching drawing, not a complete redundant-system approval or proof of internal ORing.<\/p>\n<figure data-image-role=\"application_b\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/02-application-b-67.png?quality=85&strip=all\" alt=\"Current Sharing, Droop and ORing: Three Different Power-System Decisions  title=\" width=\"1536\" height=\"1024\" current droop and oring: three different power-system decisions title =\"\"><figcaption>A separate rack layout leaves space to review the power architecture. An empty adjacent bay is not evidence of an installed redundant supply or a verified parallel system.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Write_an_architecture_brief_for_the_supplier\"><\/span>Write an architecture brief for the supplier<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Provide normal and transient load, acceptable voltage tolerance, surviving-load requirement after a failure, supply quantity, exact revisions, distribution layout and monitoring needs. Request the approved current-sharing application note and clarify whether additional ORing or hot-swap hardware is required.<\/p>\n<p>Review the <a href=\"https:\/\/www.wehopower.com\/tr\/product\/weho-psp-600-with-pfc-function-600w-smps-ac-to-dc-switching-power-supply\/\">WEHO PSP-600 product listing<\/a> and <a href=\"https:\/\/www.wehopower.com\/tr\/contact\/\">request a revision-specific architecture review<\/a>. A useful answer will separate load balance, fault isolation and available capacity instead of describing all three simply as \u201cparallel operation.\u201d<\/p>","protected":false},"excerpt":{"rendered":"<p>Balancing current is not the same as preventing backfeed, and two supplies are not automatically redundant. Specify each function separately.<\/p>","protected":false},"author":2,"featured_media":19131,"parent":0,"menu_order":16,"comment_status":"","ping_status":"","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[149,284],"class_list":["post-19135","news","type-news","status-publish","format-standard","has-post-thumbnail","hentry","news_category-blog","news_category-product-articles","entry"],"acf":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.wehopower.com\/tr\/wp-json\/wp\/v2\/news\/19135","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/tr\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/tr\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/tr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/tr\/wp-json\/wp\/v2\/comments?post=19135"}],"version-history":[{"count":0,"href":"https:\/\/www.wehopower.com\/tr\/wp-json\/wp\/v2\/news\/19135\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/tr\/wp-json\/wp\/v2\/media\/19131"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/tr\/wp-json\/wp\/v2\/media?parent=19135"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/tr\/wp-json\/wp\/v2\/news_category?post=19135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}