{"id":886706,"date":"2026-01-05T15:29:34","date_gmt":"2026-01-05T15:29:34","guid":{"rendered":"https:\/\/www.electronicsweekly.com\/?p=886706"},"modified":"2026-01-05T16:20:20","modified_gmt":"2026-01-05T16:20:20","slug":"possible-mosfet-replacement-for-scr-based-180vdc-motor-drivers","status":"publish","type":"post","link":"https:\/\/www.electronicsweekly.com\/blogs\/engineer-in-wonderland\/possible-mosfet-replacement-for-scr-based-180vdc-motor-drivers-2026-01\/","title":{"rendered":"Mosfet replacement for SCR-based 180Vdc motor drivers"},"content":{"rendered":"<p><a rel=\"image\" href=\"https:\/\/static.electronicsweekly.com\/wp-content\/uploads\/2026\/01\/05151421\/EinW-180V-HQ-SXPWM-speed-controller.webp\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-886719\" src=\"https:\/\/static.electronicsweekly.com\/wp-content\/uploads\/2026\/01\/05151421\/EinW-180V-HQ-SXPWM-speed-controller-300x293.webp\" alt=\"EinW 180V HQ-SXPWM speed controller from ebay\" width=\"300\" height=\"293\" srcset=\"https:\/\/static.electronicsweekly.com\/wp-content\/uploads\/2026\/01\/05151421\/EinW-180V-HQ-SXPWM-speed-controller-300x293.webp 300w, https:\/\/static.electronicsweekly.com\/wp-content\/uploads\/2026\/01\/05151421\/EinW-180V-HQ-SXPWM-speed-controller.webp 688w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>There are easier-to-use alternatives to the thyristor (aka SCR) based mains fed motor controllers used to control\u00a0 &#8216;180Vdc&#8217; brushed electric motors.<\/p><div class=\"elect-content\" style=\"margin-left: auto; margin-right: auto; text-align: center; \" id=\"elect-423773291\"><div id=\"x02\">\r\n<script type=\"text\/javascript\"> if ($(window).width() <= 768) { googletag.display('x02'); } <\/script>\r\n<\/div>\r\n<\/div>\n<p>These are mosfet choppers, but they tend to cost over \u00a3100 and are often poorly documented as they are made as drop-in replacements for treadmill motor controllers such as the MC2100ELS.<\/p>\n<p>Interfacing to them can also be tricky as some are design to work with a potentiometer that is at mains potential in use &#8211; so user protection has to be via an insulating case and knob.<\/p><div class=\"elect-post-content-2\" style=\"margin-left: auto; margin-right: auto; text-align: center; \" id=\"elect-1296023291\"><div id=\"DFP-EW-InRead1-Mobile\">\r\n<script type=\"text\/javascript\"> if ($(window).width() <= 768) { googletag.display('DFP-EW-InRead1-Mobile'); } <\/script>\r\n<\/div>\r\n<\/div><div class=\"elect-test\" style=\"margin-left: auto; margin-right: auto; text-align: center; \" id=\"elect-944984747\"><div id=\"DFP-EW-InRead1\">\r\n<script type=\"text\/javascript\"> if ($(window).width() > 768) { googletag.display('DFP-EW-InRead1'); } <\/script>\r\n<\/div>\r\n<BR>\r\n<\/div>\n<p>Enter the HQ-SXPWM, a mains fed controller that I had not come across before, even though it has been around for several years and is available through Ebay and Amazon.<\/p>\n<p>This seems to be a mosfet-based mains chopper that runs at 16kHz and has electrically-isolated control inputs for PWM, a potentiometer or an analogue voltage. Price is around \u00a355 to \u00a365.<\/p>\n<p>Its parameters are not adjusted via on-board preset potentiometers, but via three push-buttons and two four digit seven-segment displays inside the metal outer casing.<\/p>\n<p>Max output voltage, current limit, IR-compensation (which prevents the motor slowing under load), soft-start duration and soft stop duration are among the parameters that can be changed.<\/p>\n<p>It comes in HQ-SXPWM-X and HQ-SXPWM-A versions (no idea of the difference), and also in versions for 90Vdc motors.<\/p>\n<p>It looks good on paper, but is the electrical isolation good enough to safely protect humans, or is it simply to prevent interference?<\/p>\n<p>With no other way to find out, one has been ordered, so watch this space if the answer is of interest to you &#8211; with any luck, the operating voltage of the mosfets will also be revealed &#8211; as an opinion here is that the perceived fragility of mosfet controllers is sometimes down to\u00a0 poor transient suppression and the 450V mosfets instead of 650V devices.<\/p>\n<p>Now I need to work out how to filter 16kHz from a cable.<\/p>\n<p><strong>Why not SCR control?\u00a0<\/strong><\/p>\n<p>SCR speed controllers that supply 180Vdc motors from 240Vac mains are wonderfully robust, but have the drawback that they always present fast-rising voltage edges to the motor&#8217;s armature at a 100Hz (or 120Hz, depending on mains frequency) repetition rate.<\/p>\n<p>As the armature does not have much inductance, this approach will result in high current impulses that eat away the motor&#8217;s brushes and produce high EMI unless an additional external inductance is placed in series with armature.<\/p>\n<p>These near-essential inductors are large, heavy and expensive.<\/p>\n<p>Operating at several kHz gives the armature&#8217;s inductance a fighting chance to maintain continuous current flow via the controller&#8217;s fly-back diodes without an external inductor.<\/p>\n<p><a rel=\"image\" href=\"https:\/\/www.youtube.com\/watch?v=D3OaIt_jHFs\" target=\"_blank\" rel=\"nofollow\">Rengan Krishna Iyer has a youtube video<\/a> that runs through HQ-SXPWM control settings.<\/p>\n<p>This is part of <a rel=\"image\" href=\"https:\/\/www.electronicsweekly.com\/blogs\/engineer-in-wonderland\/index-to-cnc-related-engineer-in-wonderland-blogs-2023-08\/\">series of blogs related to CNC machines<\/a><\/p>\n<p>The image above is taken from the ebay advert of the retailer I used.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>There are easier-to-use alternatives to the thyristor (aka SCR) based mains fed motor controllers used to control\u00a0 &#8216;180Vdc&#8217; brushed electric motors. These are mosfet choppers, but they tend to cost &#8230;<\/p>\n","protected":false},"author":2,"featured_media":886719,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12787],"tags":[17388,17160,15590,14634,17467],"class_list":["post-886706","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-engineer-in-wonderland","tag-brushed","tag-einw","tag-engineer-in-wonderland","tag-motor","tag-motor-control"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.7 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Mosfet replacement for SCR-based 180Vdc motor drivers | Electronics Weekly<\/title>\n<meta name=\"description\" content=\"There are easier-to-use alternatives to the thyristor (aka SCR) based mains fed motor controllers used to control\u00a0 &#039;180Vdc&#039; brushed electric motors. These\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.electronicsweekly.com\/blogs\/engineer-in-wonderland\/possible-mosfet-replacement-for-scr-based-180vdc-motor-drivers-2026-01\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Mosfet replacement for SCR-based 180Vdc motor drivers | Electronics Weekly\" \/>\n<meta name=\"twitter:description\" content=\"There are easier-to-use alternatives to the thyristor (aka SCR) based mains fed motor controllers used to control\u00a0 &#039;180Vdc&#039; brushed electric motors. 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