{"id":17473,"date":"2026-09-08T01:10:48","date_gmt":"2026-09-07T17:10:48","guid":{"rendered":"https:\/\/www.wehopower.com\/?post_type=news&#038;p=17473"},"modified":"2026-09-08T01:11:41","modified_gmt":"2026-09-07T17:11:41","slug":"switching-power-supply-efficiency-glossary","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/fr\/news\/switching-power-supply-efficiency-glossary\/","title":{"rendered":"Switching Power Supply Datasheet Glossary: Ripple, Efficiency, MTBF &#038; Derating Explained"},"content":{"rendered":"<div>\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\">Table des mati\u00e8res<\/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=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Basculer<\/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\/fr\/news\/switching-power-supply-efficiency-glossary\/#Introduction\" >Introduction<\/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\/fr\/news\/switching-power-supply-efficiency-glossary\/#Why_Datasheet_Specifications_Matter\" >Why Datasheet Specifications Matter<\/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\/fr\/news\/switching-power-supply-efficiency-glossary\/#Ripple_And_Noise_Explained\" >Ripple And Noise Explained<\/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\/fr\/news\/switching-power-supply-efficiency-glossary\/#Efficiency_Ratings_Explained\" >Efficiency Ratings Explained<\/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\/fr\/news\/switching-power-supply-efficiency-glossary\/#MTBF_Mean_Time_Between_Failures_Explained\" >MTBF (Mean Time Between Failures) Explained<\/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\/fr\/news\/switching-power-supply-efficiency-glossary\/#Derating_Explained\" >Derating Explained<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.wehopower.com\/fr\/news\/switching-power-supply-efficiency-glossary\/#Other_Practical_Datasheet_Parameters\" >Other Practical Datasheet Parameters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.wehopower.com\/fr\/news\/switching-power-supply-efficiency-glossary\/#How_To_Compare_Power_Supplies_Efficiently\" >How To Compare Power Supplies Efficiently<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.wehopower.com\/fr\/news\/switching-power-supply-efficiency-glossary\/#FAQs\" >FAQ<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.wehopower.com\/fr\/news\/switching-power-supply-efficiency-glossary\/#What_is_power_supply_ripple_on_power_supply_datasheets\" >What is power supply ripple on power supply datasheets?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.wehopower.com\/fr\/news\/switching-power-supply-efficiency-glossary\/#Is_higher_MTBF_power_supply_always_better\" >Is higher MTBF power supply always better?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.wehopower.com\/fr\/news\/switching-power-supply-efficiency-glossary\/#Why_check_switching_power_supply_efficiency_at_real%E2%80%91world_load\" >Why check switching power supply efficiency at real\u2011world load?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.wehopower.com\/fr\/news\/switching-power-supply-efficiency-glossary\/#Why_is_derating_necessary\" >Why is derating necessary?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.wehopower.com\/fr\/news\/switching-power-supply-efficiency-glossary\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Introduction\"><\/span>Introduction<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/div>\n<div>\n<div>When evaluating a switching power supply, you cannot rely purely on wattage ratings printed on product labels. The datasheet holds critical details about real\u2011world performance, long\u2011term reliability and total cost of ownership.<\/div>\n<\/div>\n<div>\n<div>Many industrial buyers tend to focus only on voltage and current ratings while ignoring hidden technical parameters. This oversight often leads to unexpected system failures after installation. This article breaks down switching power supply efficiency, power supply ripple and MTBF power supply, delivering practical procurement insights for industrial buyers.<\/div>\n<\/div>\n<div>\n<div>WEHO develops industrial AC\u2011DC switching power supplies for diverse scenarios that require stable output and dependable round\u2011the\u2011clock operation.<\/div>\n<\/div>\n<div>\n<h2><span class=\"ez-toc-section\" id=\"Why_Datasheet_Specifications_Matter\"><\/span>Why Datasheet Specifications Matter<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/div>\n<div>\n<div>A power supply is far more than a simple voltage\u2011converting black box. Many procurement teams only look at basic electrical parameters, ignoring critical datasheet specifications. They end up selecting hardware that looks good on paper but fails to work stably in actual deployment.<\/div>\n<\/div>\n<div>\n<div>Even if a product meets basic voltage and current requirements, poor secondary parameters will create hidden risks for your whole system.<\/div>\n<\/div>\n<div>\n<div>\n<p>A wide input range does not guarantee stable output without solid line regulation performance. High nominal power means little if switching power supply efficiency drops sharply under your real\u2011life working load.<\/p>\n<div><\/div>\n<p>Many buyers overlook switching power supply efficiency and only focus on output voltage and power ratings.<\/p>\n<\/div>\n<\/div>\n<div>\n<div>Even a unit with impressive MTBF power supply ratings will suffer premature ageing when running in high\u2011temperature enclosures or operating at full load non\u2011stop. Industrial sites often face high temperature, dust interference and unstable grid voltage. These subtle indexes are far more important than nominal power figures.<\/div>\n<\/div>\n<div>\n<div>Understanding these core specifications helps you lower procurement risk and make objective cross\u2011product comparisons. Before finalizing your purchase plan, you need to match technical indexes with your on\u2011site operating environment.<\/div>\n<\/div>\n<div>\n<div>If you want to view our full hardware portfolio, visit <a title=\"\" href=\"https:\/\/www.wehopower.com\/fr\/products\/\" target=\"_blank\" rel=\"noopener\">WEHO products page<\/a> to check different power series for various industrial applications.<\/div>\n<\/div>\n<div>\n<h2><span class=\"ez-toc-section\" id=\"Ripple_And_Noise_Explained\"><\/span>Ripple And Noise Explained<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/div>\n<div>\n<div>Power supply ripple and noise are undesired voltage fluctuations superimposed on the DC output. Power supply ripple mainly originates from switching cycles and rectification circuits. Noise comes from high\u2011speed switching transients and circuit parasitics.<\/div>\n<\/div>\n<div>\n<div>These indexes are usually measured in peak\u2011to\u2011peak millivolts or RMS values. Lower power supply ripple values deliver cleaner DC output, which is critical for test instruments, signal sensors and precision control hardware.<\/div>\n<\/div>\n<div>\n<div>Many industrial buyers overlook power supply ripple during component selection, even though it directly impacts the stability of sensitive load devices.<\/div>\n<\/div>\n<div>\n<div>Excessive power supply ripple and noise will trigger various common field\u2011side troubles. It may cause unstable sensor readings, visible display interference, and erratic microcontroller behaviour. It also increases difficulties for EMC compliance testing and accelerates wear of downstream sensitive components.<\/div>\n<div>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-17477\" title=\"weho\u2011ndr\u2011120\u201124\u2011dinrail\u2011power\u2011supply\u2011low\u2011ripple\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011ndr\u2011120\u201124\u2011dinrail\u2011power\u2011supply\u2011low\u2011ripple.webp?quality=85&strip=all\" alt=\"WEHO NDR\u2011120\u201124 din\u2011rail switching power supply with low ripple noise output\" width=\"1000\" height=\"1000\" srcset=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011ndr\u2011120\u201124\u2011dinrail\u2011power\u2011supply\u2011low\u2011ripple.webp?quality=85&strip=all 1000w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011ndr\u2011120\u201124\u2011dinrail\u2011power\u2011supply\u2011low\u2011ripple-300x300.webp?quality=85&strip=all 300w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011ndr\u2011120\u201124\u2011dinrail\u2011power\u2011supply\u2011low\u2011ripple-500x500.webp?quality=85&strip=all 500w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011ndr\u2011120\u201124\u2011dinrail\u2011power\u2011supply\u2011low\u2011ripple-768x768.webp?quality=85&strip=all 768w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011ndr\u2011120\u201124\u2011dinrail\u2011power\u2011supply\u2011low\u2011ripple-12x12.webp?quality=85&strip=all 12w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<\/div>\n<\/div>\n<div>\n<div>For high\u2011precision equipment, ignoring power supply ripple indexes will directly lead to unstable system operation. In security monitoring, measurement and medical related equipment, ripple control is one of the core requirements for stable system operation.<\/div>\n<\/div>\n<div>\n<div>Do not judge ripple performance only by the simple numbers printed on datasheets. Always check test prerequisites including input voltage, load percentage and measurement bandwidth.<\/div>\n<\/div>\n<div>\n<div>Identical power supplies show completely different ripple performance under light\u2011load versus full\u2011load conditions. Test conditions set by different manufacturers are not unified. Simple numerical comparison without checking test environment will mislead your selection.<\/div>\n<\/div>\n<div>\n<div>Some manufacturers list ideal\u2011lab test data instead of real\u2011working\u2011condition data, which requires buyers to distinguish carefully.<\/div>\n<\/div>\n<div>\n<div>For security\u2011oriented projects requiring clean and stable power, refer to <a title=\"\" href=\"https:\/\/www.wehopower.com\/fr\/product\u2011category\/security\u2011power\u2011supply\/\" target=\"_blank\" rel=\"noopener\">security power supply<\/a> series optimized for low\u2011noise output and long\u2011time stable operation.<\/div>\n<\/div>\n<div>\n<h2><span class=\"ez-toc-section\" id=\"Efficiency_Ratings_Explained\"><\/span>Efficiency Ratings Explained<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/div>\n<div>\n<div>Switching power supply efficiency equals output power divided by input power, presented as a percentage. Energy lost during power conversion turns into heat inside the power supply.<\/div>\n<\/div>\n<div>\n<div>Higher\u2011efficiency units run cooler, reduce thermal load inside cabinets and cut long\u2011term operating costs. This benefit counts a lot for devices running 24 hours a day. Heat is the main cause of power supply ageing, so improving efficiency indirectly extends product service life.<\/div>\n<\/div>\n<div>\n<div>Many buyers make the common mistake of only checking full\u2011load switching power supply efficiency. Most power supplies reach peak efficiency at 50\u201175% load rate, while performance drops sharply under very light or near\u2011max load.<\/div>\n<\/div>\n<div>\n<div>In real industrial projects, equipment seldom runs at full load all the time. Actual working load usually stays between 30 percent and 70 percent. Always refer to official efficiency curves and focus on your actual working load point instead of marketing\u2011friendly peak figures.<\/div>\n<div>\n<p><img decoding=\"async\" class=\"size-full wp-image-17476\" title=\"weho\u2011edr\u2011480\u201124\u2011high\u2011efficiency\u2011dinrail\u2011power\u2011supply\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011edr\u2011480\u201124\u2011high\u2011efficiency\u2011dinrail\u2011power\u2011supply.webp?quality=85&strip=all\" alt=\"WEHO EDR\u2011480\u201124 high\u2011efficiency din\u2011rail switching power supply for 24\u2011hour continuous operation\" width=\"1000\" height=\"1000\" srcset=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011edr\u2011480\u201124\u2011high\u2011efficiency\u2011dinrail\u2011power\u2011supply.webp?quality=85&strip=all 1000w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011edr\u2011480\u201124\u2011high\u2011efficiency\u2011dinrail\u2011power\u2011supply-300x300.webp?quality=85&strip=all 300w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011edr\u2011480\u201124\u2011high\u2011efficiency\u2011dinrail\u2011power\u2011supply-500x500.webp?quality=85&strip=all 500w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011edr\u2011480\u201124\u2011high\u2011efficiency\u2011dinrail\u2011power\u2011supply-768x768.webp?quality=85&strip=all 768w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011edr\u2011480\u201124\u2011high\u2011efficiency\u2011dinrail\u2011power\u2011supply-12x12.webp?quality=85&strip=all 12w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<\/div>\n<\/div>\n<div>\n<div>Different application scenarios have different requirements for switching power supply efficiency. For low\u2011power intermittent devices, slight efficiency decline brings limited impact.<\/div>\n<\/div>\n<div>\n<div>For continuous\u2011running industrial equipment, high efficiency effectively reduces heat accumulation and lowers failure risk caused by overheating. When multiple power supplies work inside one compact cabinet, heat accumulation caused by low efficiency will raise overall cabinet temperature and shorten service life of all surrounding electronic devices.<\/div>\n<\/div>\n<div>\n<div>Procurement Tip: Compare switching power supply efficiency under identical test conditions. WEHO industrial power supplies adopt PFC design to keep stable efficiency across wide working ranges.<\/div>\n<\/div>\n<div>\n<h2><span class=\"ez-toc-section\" id=\"MTBF_Mean_Time_Between_Failures_Explained\"><\/span>MTBF (Mean Time Between Failures) Explained<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/div>\n<div>\n<div>MTBF power supply refers to statistically calculated average operating hours between failures under defined environmental conditions. It is an important reliability reference rather than an absolute service\u2011life guarantee.<\/div>\n<\/div>\n<div>\n<div>Many buyers misunderstand this index as guaranteed service time, which is a typical mistake in power supply selection.<\/div>\n<\/div>\n<div>\n<div>You cannot treat MTBF power supply as exact product lifespan. This index is calculated based on component stress, ambient temperature and industry reliability models.<\/div>\n<\/div>\n<div>\n<div>Two power supplies with similar MTBF figures can perform totally differently on site. Actual working temperature, cooling conditions, capacitor quality and protection circuit design greatly influence real\u2011world service life.<\/div>\n<\/div>\n<div>\n<div>High MTBF power supply data obtained under laboratory environment cannot be directly applied to high\u2011temperature, dusty industrial sites. Once ambient temperature rises, actual effective MTBF value will drop significantly.<\/div>\n<\/div>\n<div>\n<div>MTBF power supply should be evaluated together with warranty terms and capacitor lifetime instead of being used as the single selection standard. Capacitors are the most vulnerable components inside switching power supplies. Their service life directly determines the real product lifespan.<\/div>\n<\/div>\n<div>\n<div>When evaluating reliability, you also need to pay attention to component grade and protection mechanism. For custom application advice, you can learn about our design concept via <a title=\"\" href=\"https:\/\/www.wehopower.com\/fr\/\" target=\"_blank\" rel=\"noopener\">WEHO official homepage<\/a>.<\/div>\n<\/div>\n<div>\n<h2><span class=\"ez-toc-section\" id=\"Derating_Explained\"><\/span>Derating Explained<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/div>\n<div>\n<div>Derating means operating a power supply below its maximum rated output to reduce thermal and electrical stress on internal components. Most industrial applications recommend a 70\u201180% load ratio. This rule applies especially for high\u2011ambient\u2011temperature environments, sealed enclosed cabinets and non\u2011stop operation.<\/div>\n<div>\n<p><img decoding=\"async\" class=\"size-full wp-image-17475\" title=\"weho\u2011dr\u201160\u201124\u2011mounted\u2011din\u2011rail\u2011cabinet\u2011installation\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011dr\u201160\u201124\u2011mounted\u2011din\u2011rail\u2011cabinet\u2011installation.webp?quality=85&strip=all\" alt=\"WEHO DR\u201160\u201124 din\u2011rail power supply mounted on standard DIN rail inside industrial cabinet\" width=\"500\" height=\"500\" srcset=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011dr\u201160\u201124\u2011mounted\u2011din\u2011rail\u2011cabinet\u2011installation.webp?quality=85&strip=all 500w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011dr\u201160\u201124\u2011mounted\u2011din\u2011rail\u2011cabinet\u2011installation-300x300.webp?quality=85&strip=all 300w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/weho\u2011dr\u201160\u201124\u2011mounted\u2011din\u2011rail\u2011cabinet\u2011installation-12x12.webp?quality=85&strip=all 12w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/p>\n<\/div>\n<\/div>\n<div>\n<div>Many system designers ignore derating requirements and configure power supplies at full load. This creates big hidden risks for long\u2011term operation.<\/div>\n<\/div>\n<div>\n<div>When running close to 100% rating, internal semiconductors, capacitors and transformers bear heavy stress. This speeds up component ageing and raises overall failure probability.<\/div>\n<\/div>\n<div>\n<div>Proper derating effectively extends service life and improves operation stability. Sufficient derating also reserves capacity for instantaneous current surge during equipment startup.<\/div>\n<\/div>\n<div>\n<div>Pay attention to manufacturer\u2011provided derating curves. Many power supplies can only deliver full rated power below certain temperature thresholds. Once ambient temperature rises, available output power will decrease accordingly.<\/div>\n<\/div>\n<div>\n<div>If you ignore derating rules and keep full\u2011load operation under high temperature, even high\u2011quality power supplies will face premature failure risk.<\/div>\n<\/div>\n<div>\n<h2><span class=\"ez-toc-section\" id=\"Other_Practical_Datasheet_Parameters\"><\/span>Other Practical Datasheet Parameters<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/div>\n<div>\n<div>Load regulation shows output voltage shift when load changes from minimum to maximum. Line regulation reflects output variation caused by fluctuating input voltage.<\/div>\n<\/div>\n<div>\n<div>Smaller values mean better stability for voltage\u2011sensitive devices. Under complex industrial power grid conditions, these two indexes deserve your full attention. Grid voltage fluctuation frequently occurs in factory workshops. Good line regulation can avoid equipment reset caused by input voltage swing.<\/div>\n<\/div>\n<div>\n<div>Hold\u2011up time describes how long output stays valid after input power cuts off. This parameter is critical for safe device shutdown and important data preservation. Note that hold\u2011up time changes with actual load, so do not only refer to nominal datasheet value.<\/div>\n<\/div>\n<div>\n<div>Inrush current is the surge current generated at power\u2011on moment. Excessive inrush current may blow fuses, trigger circuit protection or interfere with other devices sharing the same input circuit. It is a non\u2011negligible index for multi\u2011device centralized power supply systems.<\/div>\n<\/div>\n<div>\n<div>\n<div>\n<div tabindex=\"0\" aria-describedby=\"5ki3qxv\"><\/div>\n<\/div>\n<\/div>\n<div>\n<div>\n<div>\n<div>\n<table style=\"width: 100%; height: 390px;\">\n<thead>\n<tr style=\"height: 30px;\">\n<th style=\"height: 30px;\">Parameter<\/th>\n<th style=\"height: 30px;\">Main function<\/th>\n<th style=\"height: 30px;\">Typical concern scenario<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"height: 60px;\">\n<td style=\"height: 60px;\">Power supply ripple<\/td>\n<td style=\"height: 60px;\">Evaluate DC output cleanliness<\/td>\n<td style=\"height: 60px;\">Sensors, precision measurement, security equipment<\/td>\n<\/tr>\n<tr style=\"height: 60px;\">\n<td style=\"height: 60px;\">Switching power supply efficiency<\/td>\n<td style=\"height: 60px;\">Evaluate energy loss &amp; heat generation<\/td>\n<td style=\"height: 60px;\">24\u2011hour continuous operation, compact cabinet<\/td>\n<\/tr>\n<tr style=\"height: 60px;\">\n<td style=\"height: 60px;\">MTBF power supply<\/td>\n<td style=\"height: 60px;\">Statistical reliability reference<\/td>\n<td style=\"height: 60px;\">Unattended industrial sites, long\u2011life equipment<\/td>\n<\/tr>\n<tr style=\"height: 60px;\">\n<td style=\"height: 60px;\">Derating ratio<\/td>\n<td style=\"height: 60px;\">Reduce component stress<\/td>\n<td style=\"height: 60px;\">High temperature, sealed cabinet, non\u2011stop running<\/td>\n<\/tr>\n<tr style=\"height: 60px;\">\n<td style=\"height: 60px;\">Load &amp; line regulation<\/td>\n<td style=\"height: 60px;\">Guarantee output voltage stability<\/td>\n<td style=\"height: 60px;\">Fluctuating grid, sensitive load<\/td>\n<\/tr>\n<tr style=\"height: 60px;\">\n<td style=\"height: 60px;\">Hold\u2011up time<\/td>\n<td style=\"height: 60px;\">Support safe power\u2011off sequence<\/td>\n<td style=\"height: 60px;\">Data\u2011saving industrial devices<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<h2><span class=\"ez-toc-section\" id=\"How_To_Compare_Power_Supplies_Efficiently\"><\/span>How To Compare Power Supplies Efficiently<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/div>\n<div>\n<div>First, sort out on\u2011site working conditions clearly. Confirm input voltage range, actual load ratio, maximum ambient temperature, cooling method and operation mode, continuous or intermittent.<\/div>\n<\/div>\n<div>\n<div>Many bad procurement decisions come from only comparing datasheet nominal values without matching real\u2011world working conditions.<\/div>\n<\/div>\n<div>\n<div>Build your comparison checklist covering switching power supply efficiency, power supply ripple, MTBF power supply, derating curve, regulation performance, hold\u2011up time and inrush current.<\/div>\n<\/div>\n<div>\n<div>Prioritize parameters according to your application. Measurement\u2011related devices focus on low power supply ripple. Cabinet\u2011mount continuous\u2011running equipment pays more attention to switching power supply efficiency and thermal performance.<\/div>\n<\/div>\n<div>\n<div>Always verify test conditions behind every specification before purchase. Indexes measured under ideal lab environment cannot fully represent real\u2011site performance.<\/div>\n<\/div>\n<div>\n<div>It is suggested to confirm with manufacturers whether test environment matches your actual field conditions.<\/div>\n<\/div>\n<div>\n<h2><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/div>\n<div>\n<h3><span class=\"ez-toc-section\" id=\"What_is_power_supply_ripple_on_power_supply_datasheets\"><\/span>What is power supply ripple on power supply datasheets?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/div>\n<div>\n<div>Power supply ripple and noise are unwanted AC fluctuations overlaying DC output. Lower figures bring cleaner power for precision electronics.<\/div>\n<\/div>\n<div>\n<h3><span class=\"ez-toc-section\" id=\"Is_higher_MTBF_power_supply_always_better\"><\/span>Is higher MTBF power supply always better?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/div>\n<div>\n<div>MTBF power supply is a statistical reference. Always combine working temperature, component quality and warranty instead of relying solely on this index.<\/div>\n<\/div>\n<div>\n<h3><span class=\"ez-toc-section\" id=\"Why_check_switching_power_supply_efficiency_at_real%E2%80%91world_load\"><\/span>Why check switching power supply efficiency at real\u2011world load?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/div>\n<div>\n<div>Switching power supply efficiency varies greatly with load. Checking efficiency under your actual working load avoids overestimating real\u2011world energy\u2011saving performance.<\/div>\n<\/div>\n<div>\n<h3><span class=\"ez-toc-section\" id=\"Why_is_derating_necessary\"><\/span>Why is derating necessary?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/div>\n<div>\n<div>Derating reduces component stress, slows ageing and improves long\u2011term reliability for continuously operated systems.<\/div>\n<\/div>\n<div>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/div>\n<div>\n<div>Do not judge switching power supplies merely by rated wattage. Switching power supply efficiency controls long\u2011term running cost. Power supply ripple determines output quality for sensitive loads. MTBF power supply offers valuable reliability reference and derating safeguards long\u2011term stable performance.<\/div>\n<\/div>\n<div>\n<div>Evaluate these specifications comprehensively combining your actual working scenario, rather than chasing single\u2011item high\u2011value parameters.<\/div>\n<\/div>\n<div>\n<div>Fully understanding datasheet parameters helps you avoid costly wrong purchases and reduce system maintenance cost in later stages.<\/div>\n<\/div>\n<div>\n<div>If you need support on datasheet interpretation or power supply selection, <a title=\"\" href=\"https:\/\/www.wehopower.com\/fr\/contact\/\" target=\"_blank\" rel=\"noopener\">contact WEHO today<\/a> for tailored application suggestions.<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Introduction When evaluating a switching power supply, you cannot rely purely on wattage ratings printed on product labels. The datasheet holds critical details about real\u2011world performance, long\u2011term reliability and total cost of ownership. Many industrial buyers tend to focus only on voltage and current ratings while ignoring hidden technical parameters. This oversight often leads to&hellip; <a class=\"more-link\" href=\"https:\/\/www.wehopower.com\/fr\/news\/switching-power-supply-efficiency-glossary\/\">Continue reading <span class=\"screen-reader-text\">Switching Power Supply Datasheet Glossary: Ripple, Efficiency, MTBF &#038; Derating Explained<\/span><\/a><\/p>","protected":false},"author":4,"featured_media":17474,"parent":0,"menu_order":14,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[149,148],"class_list":["post-17473","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\/fr\/wp-json\/wp\/v2\/news\/17473","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/comments?post=17473"}],"version-history":[{"count":2,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news\/17473\/revisions"}],"predecessor-version":[{"id":17479,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news\/17473\/revisions\/17479"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/media\/17474"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/media?parent=17473"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/fr\/wp-json\/wp\/v2\/news_category?post=17473"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}