{"id":3920,"date":"2026-05-13T03:31:56","date_gmt":"2026-05-13T03:31:56","guid":{"rendered":"https:\/\/blogs.lcsc.com\/blog\/?p=3920"},"modified":"2026-05-15T02:15:38","modified_gmt":"2026-05-15T02:15:38","slug":"ac-to-dc-converter-basics","status":"publish","type":"post","link":"https:\/\/blogs.lcsc.com\/blog\/ac-to-dc-converter-basics\/","title":{"rendered":"AC to DC Converter Basics: Rectification, Filtering, and Power Supply Design"},"content":{"rendered":"<h2><b><span data-font-family=\"Arial\">Key Takeaways of an AC to DC <a href=\"https:\/\/www.lcsc.com\/category\/1375.html\">Converter<\/a><\/span><\/b><\/h2>\n<ul>\n<li><b><span data-font-family=\"Arial\">Topology Affects Ripple: <\/span><\/b><span data-font-family=\"Arial\">Full-wave bridge rectifiers double the ripple frequency compared to half-wave designs, allowing for a filter capacitor half the size for the same ripple voltage.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Efficiency Standards: <\/span><\/b><span data-font-family=\"Arial\">Linear regulators offer 40\u201360% efficiency, whereas SMPS achieve 85\u201395%, making switching supplies the standard for anything above 5W.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Safety Compliance: <\/span><\/b><span data-font-family=\"Arial\">For mains-connected equipment, IEC 62368-1 requires reinforced insulation (3 kV). Using pre-certified flyback transformers simplifies the regulatory process.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">PFC Requirements: <\/span><\/b><span data-font-family=\"Arial\">Active Power Factor Correction is mandatory per IEC 61000-3-2 for devices drawing more than 75W.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Diode Selection: <\/span><\/b><span data-font-family=\"Arial\">Above 50 kHz, standard diodes cause high losses due to slow recovery. Schottky or SiC diodes are essential for their near-instant switching speeds.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">What Is an AC to DC Converter?<\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">An AC to DC converter, or <a href=\"https:\/\/blogs.lcsc.com\/blog\/mdd-high-current-6a-8a-full-bridge-rectifier\/\">rectifier<\/a>, transforms a sinusoidal AC input (e.g., 85\u2013265V AC) into a stable, regulated DC output. Conversion follows four steps: rectification (directing current via diodes), filtering (smoothing pulses with capacitors), regulation (stabilising voltage), and isolation (separating rails via transformers). In a standard bridge rectifier, four diodes conduct in alternating pairs per AC half-cycle. A 230V input yields a theoretical peak of approximately 325V DC before filtering.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Key Features and Advantages of Modern AC to DC Converter Designs<\/span><\/b><\/h2>\n<table>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"173\"><b><span data-font-family=\"Arial\">Feature<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"269\"><b><span data-font-family=\"Arial\">Description<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"229\"><b><span data-font-family=\"Arial\">Engineering Benefit<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"173\"><b><span data-font-family=\"Arial\">Full-Wave Bridge Rectification<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"269\"><span data-font-family=\"Arial\">Four-diode bridge conducts on both half-cycles; output ripple frequency is 2\u00d7 mains (100\/120 Hz)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"229\"><span data-font-family=\"Arial\">Halves required filter capacitance versus half-wave<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"173\"><b><span data-font-family=\"Arial\">Switched-Mode Topology (Flyback\/LLC)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"269\"><span data-font-family=\"Arial\">High-frequency transformer operating at 50 kHz\u20131 MHz converts energy via controlled FET switching<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"229\"><span data-font-family=\"Arial\">Achieves 85\u201395% conversion efficiency; enables compact magnetics<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"173\"><b><span data-font-family=\"Arial\">Power Factor Correction (PFC)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"269\"><span data-font-family=\"Arial\">Boost converter pre-stage shapes input current to follow AC voltage sinusoid, targeting PF &gt; 0.99<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"229\"><span data-font-family=\"Arial\">Reduces reactive current; mandatory per IEC 61000-3-2 for loads above 75W<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"173\"><b><span data-font-family=\"Arial\">Synchronous Rectification<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"269\"><span data-font-family=\"Arial\">N-channel MOSFETs replace output diodes in secondary-side rectification<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"229\"><span data-font-family=\"Arial\">Cuts rectifier conduction losses; improves efficiency by 2\u20135 percentage points at full load<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><b><span data-font-family=\"Arial\">Hold-Up Time Bulk Capacitor Sizing Formula: C = (2 \u00d7 P \u00d7 t) \/ (Vpeak\u00b2 \u2212 Vmin\u00b2)<\/span><\/b><\/p>\n<p><span data-font-family=\"Arial\">Example: 100W load, 16.7 ms hold-up (IEC 61000-4-11 Class B), Vpeak = 325V DC, Vmin = 200V DC \u2192 C = (2 \u00d7 100 \u00d7 0.0167) \/ (325\u00b2 \u2212 200\u00b2) = 51 \u03bcF. Add 20% margin \u2192 specify 68 \u03bcF or 100 \u03bcF. Verify ripple current rating at 100\/120 Hz.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Technical Specifications of <\/span><\/b><b><span data-font-family=\"Arial\">AC to DC Converter<\/span><\/b><\/h2>\n<table>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"167\"><b><span data-font-family=\"Arial\">Parameter<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"126\"><b><span data-font-family=\"Arial\">Linear Regulator<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"164\"><b><span data-font-family=\"Arial\">SMPS (Flyback\/LLC)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"59\"><b><span data-font-family=\"Arial\">Unit<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"107\"><b><span data-font-family=\"Arial\">Compliance<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"167\"><b><span data-font-family=\"Arial\">Conversion Efficiency<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"126\"><span data-font-family=\"Arial\">40\u201360<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"164\"><span data-font-family=\"Arial\">85\u201395<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"59\"><span data-font-family=\"Arial\">%<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"107\"><span data-font-family=\"Arial\">EU CoC Tier 2<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"167\"><b><span data-font-family=\"Arial\">Output Ripple Voltage<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"126\"><span data-font-family=\"Arial\">50\u2013200<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"164\"><span data-font-family=\"Arial\">20\u2013100 pk-pk<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"59\"><span data-font-family=\"Arial\">mV<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"107\"><span data-font-family=\"Arial\">JEDEC std<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"167\"><b><span data-font-family=\"Arial\">Hold-Up Time<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"126\"><span data-font-family=\"Arial\">10\u201320 ms<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"164\"><span data-font-family=\"Arial\">16\u201320 ms<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"59\"><span data-font-family=\"Arial\">ms<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"107\"><span data-font-family=\"Arial\">IEC 61000-4-11<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"167\"><b><span data-font-family=\"Arial\">Isolation Voltage<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"126\"><span data-font-family=\"Arial\">None typical<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"164\"><span data-font-family=\"Arial\">3000 V AC reinforced<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"59\"><span data-font-family=\"Arial\">V AC<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"107\"><span data-font-family=\"Arial\">IEC 62368-1<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b><span data-font-family=\"Arial\"><a href=\"https:\/\/www.lcsc.com\/category\/1031.html\">Linear Regulator<\/a> vs. <a href=\"https:\/\/www.lcsc.com\/category\/845.html\">SMPS<\/a> Comparison<\/span><\/b><\/h2>\n<table>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"152\"><b><span data-font-family=\"Arial\">Attribute<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173\"><b><span data-font-family=\"Arial\">Linear Regulator (LDO)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"180\"><b><span data-font-family=\"Arial\">Switched-Mode (SMPS)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"174\"><b><span data-font-family=\"Arial\">Best For<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"152\"><b><span data-font-family=\"Arial\">Efficiency<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173\"><span data-font-family=\"Arial\">40\u201360% (dropout loss)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"180\"><span data-font-family=\"Arial\">85\u201395%<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"174\"><span data-font-family=\"Arial\">SMPS for Pdiss &gt; 2W<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"152\"><b><span data-font-family=\"Arial\">Output Noise<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173\"><span data-font-family=\"Arial\">5\u201350 \u03bcV RMS<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"180\"><span data-font-family=\"Arial\">50\u2013500 \u03bcV RMS<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"174\"><span data-font-family=\"Arial\">Linear for RF\/ADC<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"152\"><b><span data-font-family=\"Arial\">Isolation<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173\"><span data-font-family=\"Arial\">None inherent<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"180\"><span data-font-family=\"Arial\">Full galvanic via transformer<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"174\"><span data-font-family=\"Arial\">SMPS when mains isolation required<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"152\"><b><span data-font-family=\"Arial\">Transient Response<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173\"><span data-font-family=\"Arial\">&lt; 1 \u03bcs<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"180\"><span data-font-family=\"Arial\">5\u201350 \u03bcs<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"174\"><span data-font-family=\"Arial\">Linear for fast load steps<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b><span data-font-family=\"Arial\">Quick Selection Guide<\/span><\/b><\/h3>\n<ul>\n<li><b><span data-font-family=\"Arial\">Load power above 5W? \u2192 <\/span><\/b><span data-font-family=\"Arial\">Use SMPS \u2014 linear regulator thermal dissipation becomes impractical above this threshold.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Galvanic isolation from mains required? \u2192 <\/span><\/b><span data-font-family=\"Arial\">Use transformer-based SMPS (flyback or LLC).<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Output noise below 50 \u03bcV RMS required? \u2192 <\/span><\/b><span data-font-family=\"Arial\">Use LDO post-regulation, even after an SMPS primary stage.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">IEC 61000-3-2 PFC compliance required (load &gt; 75W)? \u2192 <\/span><\/b><span data-font-family=\"Arial\">SMPS with dedicated PFC boost stage is mandatory.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Operating frequency above 50 kHz? \u2192 <\/span><\/b><span data-font-family=\"Arial\">Switch to Schottky or SiC diodes in the rectifier stage.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Hold-up time requirement above 20 ms? \u2192 <\/span><\/b><span data-font-family=\"Arial\">Size bulk capacitance using C = (2 \u00d7 P \u00d7 t) \/ (Vpeak\u00b2 \u2212 Vmin\u00b2) and verify ripple current rating at 100\/120 Hz.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">Real-World Application Scenarios of an AC to DC Converter<\/span><\/b><\/h2>\n<ul>\n<li><b><span data-font-family=\"Arial\">Server PSU (80 Plus Titanium): <\/span><\/b><span data-font-family=\"Arial\">1200W 1U unit achieves &gt; 96% efficiency using LLC resonant topology and synchronous rectification. Power factor &gt; 0.99.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">EV On-Board Charger (OBC): <\/span><\/b><span data-font-family=\"Arial\">Converts single or three-phase AC to 200\u2013450V DC battery bus. Must support ISO 15118, provide galvanic isolation, and operate reliably at 85\u00b0C.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Industrial PLC Power Rail: <\/span><\/b><span data-font-family=\"Arial\">Standardised on 24V DC DIN-rail SMPS with \u00b11% regulation. Overvoltage protection, current limiting, 500k+ hours MTBF per IEC 61131-2.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Medical Imaging Equipment: <\/span><\/b><span data-font-family=\"Arial\">Requires extreme isolation (2\u00d7 MOPP) and &lt; 10 \u03bcA leakage current per IEC 60601-1. Dual-isolated flyback with minimal Y-capacitance is mandatory.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">Frequently Asked Questions<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">Q<\/span><\/b><b><span data-font-family=\"Arial\">:<\/span><\/b> <b><span data-font-family=\"Arial\">How do I calculate the minimum bulk filter capacitor for a ripple specification?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Required capacitance = load current \/ (2 \u00d7 mains frequency \u00d7 allowed ripple voltage). For a 5A load at 50 Hz with 500 mV ripple: C = 5 \/ (2 \u00d7 50 \u00d7 0.5) = 100,000 \u03bcF. Add a 20% margin and prioritise the capacitor\u2019s ripple current rating.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Q<\/span><\/b><b><span data-font-family=\"Arial\">:<\/span><\/b> <b><span data-font-family=\"Arial\">At what temperature should I derate electrolytic capacitor lifetime?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Lifetime follows the 10-degree rule: every 10\u00b0C reduction from the maximum rated temperature doubles service life. A 2,000-hour\/105\u00b0C capacitor lasts approximately 16,000 hours at 75\u00b0C. For 50,000+ hour MTBF, aim for core temperature at least 30\u00b0C below rated maximum.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Q<\/span><\/b><b><span data-font-family=\"Arial\">:<\/span><\/b> <b><span data-font-family=\"Arial\">Schottky vs. SiC diode: which should I choose for the rectifier?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Standard Schottky diodes are best for outputs below 150V and 200 kHz. SiC Schottky diodes are necessary for high-voltage (above 600V) or high-frequency (above 200 kHz) designs because their near-zero reverse recovery eliminates efficiency-killing switching spikes.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Q<\/span><\/b><b><span data-font-family=\"Arial\">:<\/span><\/b> <b><span data-font-family=\"Arial\">What EMI filter topology is needed for CISPR 32 Class B compliance?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">A two-stage filter is typically required: a Differential-Mode stage (X-capacitors and inductors) stops noise between power lines, while a Common-Mode stage (Y-capacitors and CM choke) stops noise travelling to earth ground. Place this filter immediately after the mains inlet.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Conclusion<\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">AC-DC design balances efficiency and isolation against complexity and cost. Linear regulation works for low-noise loads under 5W, but switching architectures with <a href=\"https:\/\/blogs.lcsc.com\/blog\/factor-correction-capacitors-explained\/\">PFC<\/a> are necessary above 5W (and mandatory above 75W per IEC 61000-3-2). Minimising voltage dropout and ripple current is the key to reducing heat, extending component life, and lowering total costs.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Find What You Need on <a href=\"https:\/\/www.lcsc.com\/\">LCSC<\/a><\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">LCSC Electronics stocks a comprehensive range of AC-DC components from Mean Well, RECOM, XP Power, Infineon, onsemi, STMicroelectronics, Vishay, Hi-Link (HLK series), and MORNSUN (WRF\/LOF series).<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Key Takeaways of an AC to DC Converter Topology Affects Ripple: Full-wave bridge rectifiers double the ripple frequency compared to half-wave designs, allowing for a filter capacitor half the size for the same ripple voltage. Efficiency Standards: Linear regulators offer 40\u201360% efficiency, whereas SMPS achieve 85\u201395%, making switching supplies the standard for anything above 5W. [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[27],"tags":[303,289],"class_list":["post-3920","post","type-post","status-publish","format-standard","hentry","category-electronic-components","tag-ac-to-dc-converter","tag-electronic-components"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>AC to DC Converter Basics: Rectifier Topologies Explained - LCSC<\/title>\n<meta name=\"description\" content=\"AC to DC converter fundamentals covering rectifier topologies filter capacitors regulation and efficiency tradeoffs for power supply design.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.lcsc.com\/blog\/ac-to-dc-converter-basics\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AC to DC Converter Basics: Rectifier Topologies Explained - 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