{"id":986,"date":"2021-03-29T11:33:07","date_gmt":"2021-03-29T11:33:07","guid":{"rendered":"https:\/\/imperix.com\/doc\/?p=986"},"modified":"2025-11-20T10:57:05","modified_gmt":"2025-11-20T10:57:05","slug":"variable-frequency-operation","status":"publish","type":"post","link":"https:\/\/imperix.com\/doc\/help\/variable-frequency-operation","title":{"rendered":"Variable frequency operation with imperix controllers"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 ez-toc-wrap-right-text 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 of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/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:\/\/imperix.com\/doc\/help\/variable-frequency-operation\/#Working-principle-of-variable-frequency-operation\" >Working principle of variable frequency operation<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/imperix.com\/doc\/help\/variable-frequency-operation\/#Remarks\" >Remarks<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/imperix.com\/doc\/help\/variable-frequency-operation\/#Variable-frequency-with-ACG-SDK\" >Variable frequency with ACG SDK<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/imperix.com\/doc\/help\/variable-frequency-operation\/#Variable-frequency-with-C-SDK\" >Variable frequency with C++ SDK<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>This note covers the configuration and implementation of variable frequency operation with imperix controllers (B-Box RCP and B-BoardPRO).<\/p>\n\n\n\n<p>Changing the modulation frequency during the control execution may be useful in applications such as resonant converters or in case of dynamic reconfiguration (start-up of drives for instance). This note shows how the B-Board PRO and B-Box RCP support the real-time tuning of the modulators&#8217; switching frequency.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-working-principle-of-variable-frequency-operation\"><span class=\"ez-toc-section\" id=\"Working-principle-of-variable-frequency-operation\"><\/span>Working principle of variable frequency operation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>As a <code>CB-PWM<\/code> block can be freely mapped to any of the four available <code>CLK<\/code> blocks, variable-frequency modulation is designed to be implemented by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mapping the <code>CB-PWM<\/code> block that must have a variable frequency to a specific <code>CLK<\/code>.<\/li>\n\n\n\n<li>Changing the frequency of the corresponding <code>CLK<\/code> during the execution.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-remarks\"><span class=\"ez-toc-section\" id=\"Remarks\"><\/span>Remarks<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>More than one variable-frequencies can be used simultaneously.<\/li>\n\n\n\n<li>The interrupt and the sampling processes are linked <em>by design<\/em> to the same <code>CLK<\/code> (CLK0) and their frequency can not be changed during the execution. Consequently, an additional <code>CLK<\/code> block, mapped on CLK1, CLK2, or CLK3, must be used for variable frequency operation.<\/li>\n\n\n\n<li>The <code>CLK<\/code> blocks are implemented such that frequency changes are glitch-less, i.e. does not generate any unexpected behavior during the transition. Any frequency step can therefore be done at any time during operation.<\/li>\n\n\n\n<li>A change in the frequency is only applied at reset of the clock source counter. This means that the <code>CLK<\/code> block completes the running period before changing its frequency.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-variable-frequency-with-acg-sdk\"><span class=\"ez-toc-section\" id=\"Variable-frequency-with-ACG-SDK\"><\/span>Variable frequency with ACG SDK<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The screenshots below show how to use and configure a <a href=\"https:\/\/imperix.com\/doc\/software\/clk-clock-generator\">Clock generator (CLK)<\/a> block for variable frequency operation. <\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"446\" height=\"530\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-182.png\" alt=\"Variable frequency operation on Simulink\" class=\"wp-image-987\" title=\"Product notes &gt; PN121: Variable frequency operation with the B-Box\/B-Board &gt; image-20200903-152832.png\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-182.png 446w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-182-252x300.png 252w\" sizes=\"auto, (max-width: 446px) 100vw, 446px\" \/><figcaption class=\"wp-element-caption\">Simulink<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"358\" height=\"543\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-183.png\" alt=\"Variable frequency operation on PLECS\" class=\"wp-image-988\" title=\"Product notes &gt; PN121: Variable frequency operation with the B-Box\/B-Board &gt; image2020-10-27_17-7-43.png\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-183.png 358w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-183-198x300.png 198w\" sizes=\"auto, (max-width: 358px) 100vw, 358px\" \/><figcaption class=\"wp-element-caption\">PLECS<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-variable-frequency-with-c-sdk\"><span class=\"ez-toc-section\" id=\"Variable-frequency-with-C-SDK\"><\/span>Variable frequency with C++ SDK<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>As shown in the following code snippet, the frequency change is performed by re-configuring the clock generator <code>CLOCK_1<\/code> during real-time control execution. This example uses the following configuration:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><th><strong>Clock<\/strong><\/th><th><strong>Linked to<\/strong><\/th><th><strong>Configuration<\/strong><\/th><\/tr><tr><td><code>CLOCK_0<\/code><\/td><td>Interrupt and sampling<\/td><td>Fixed frequency (50kHz)<\/td><\/tr><tr><td><code>CLOCK_1<\/code><\/td><td><code>PWM_CHANNEL_0<\/code><\/td><td>Variable frequency<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"C++\" data-shcb-language-slug=\"cpp\"><span><code class=\"hljs language-cpp\"><span class=\"hljs-function\">tUserSafe <span class=\"hljs-title\">UserInit<\/span><span class=\"hljs-params\">(<span class=\"hljs-keyword\">void<\/span>)<\/span>\n<\/span>{\n  <span class=\"hljs-comment\">\/\/ The interrupt and sampling use CLOCK_0<\/span>\n  Clock_SetFrequency(CLOCK_0, <span class=\"hljs-number\">50e3<\/span>);\n  ConfigureMainInterrupt(UserInterrupt, CLOCK_0, <span class=\"hljs-number\">0.5<\/span>);\n         \n  <span class=\"hljs-comment\">\/\/ The PWM_CHANNEL_0 uses CLOCK_1 which is set as real-time tunable  <\/span>\n  Clock_SetFrequency(CLOCK_1, <span class=\"hljs-number\">10e3<\/span>);\n  Clock_ConfigureAsRealTimeTunable(CLOCK_1);\n     \n  CbPwm_ConfigureClock(PWM_CHANNEL_0, CLOCK_1);\n  CbPwm_ConfigureOutputMode(PWM_CHANNEL_0, COMPLEMENTARY);\n  CbPwm_ConfigureCarrier(PWM_CHANNEL_0, TRIANGLE);\n  CbPwm_ConfigureDeadTime(PWM_CHANNEL_0, <span class=\"hljs-number\">1e-6<\/span>);\n  CbPwm_SetDutyCycle(PWM_CHANNEL_0, <span class=\"hljs-number\">0.5<\/span>);\n  CbPwm_Activate(PWM_CHANNEL_0);\n   \n  Adc_ConfigureInput(<span class=\"hljs-number\">0<\/span>, GAIN_I, <span class=\"hljs-number\">0.0<\/span>);\n  Adc_ConfigureInput(<span class=\"hljs-number\">1<\/span>, GAIN_V, <span class=\"hljs-number\">0.0<\/span>);\n \n  <span class=\"hljs-keyword\">return<\/span> SAFE;\n}\n \n<span class=\"hljs-comment\">\/\/ Global variables can be observed from Cockpit<\/span>\n<span class=\"hljs-keyword\">float<\/span> current;\n<span class=\"hljs-keyword\">float<\/span> voltage;\n<span class=\"hljs-keyword\">float<\/span> freq;\n \n<span class=\"hljs-function\">tUserSafe <span class=\"hljs-title\">UserInterrupt<\/span><span class=\"hljs-params\">(<span class=\"hljs-keyword\">void<\/span>)<\/span>\n<\/span>{\n  current = Adc_GetValue(<span class=\"hljs-number\">0<\/span>);\n  voltage = Adc_GetValue(<span class=\"hljs-number\">1<\/span>);\n   \n  freq = GetOptimizedFrequency(current, voltage);\n   \n  Clock_SetFrequency(CLOCK_0, freq);\n   \n  <span class=\"hljs-keyword\">return<\/span> SAFE;\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C++<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cpp<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>","protected":false},"excerpt":{"rendered":"<p>This note covers the configuration and implementation of variable frequency operation with imperix controllers (B-Box RCP and B-BoardPRO). Changing the modulation frequency during the control&#8230;<\/p>\n","protected":false},"author":4,"featured_media":2998,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[3],"tags":[],"software-environments":[105,103,104],"provided-results":[],"related-products":[50,31,32,92,166,51,110],"guidedreadings":[],"tutorials":[],"user-manuals":[139,138,137],"coauthors":[70],"class_list":["post-986","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-help","software-environments-c-plus-plus","software-environments-matlab","software-environments-plecs","related-products-acg-sdk","related-products-b-board-pro","related-products-b-box-rcp","related-products-b-box-micro","related-products-b-box-rcp-3-0","related-products-cpp-sdk","related-products-tpi","user-manuals-b-board-pro","user-manuals-b-box-micro","user-manuals-b-box-rcp-3-0"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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