MPPT & Buck Duty - two approaches, which is correct? | Electronics Forum (Circuits, Projects and Microcontrollers)

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Thevenin creates an equivalent impedance (MPPT is where in=out impedance). As the source current is fixed I used this to derive a voltage..." /> <meta property="og:description" content="Buck A or Buck B? Thevenin creates an equivalent impedance (MPPT is where in=out impedance). As the source current is fixed I used this to derive a voltage at Vin. I then tracked this voltage using the method described at Buck A. This means the duty is variable, but I also thought because the..." /> <meta property="twitter:description" content="Buck A or Buck B? Thevenin creates an equivalent impedance (MPPT is where in=out impedance). As the source current is fixed I used this to derive a voltage at Vin. 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It may not display this or other websites correctly.<br />You should upgrade or use an <a href="https://www.google.com/chrome/" target="_blank" rel="noopener">alternative browser</a>.</div> <div class="p-body-header"> <div class="p-title "> <h1 class="p-title-value">MPPT & Buck Duty - two approaches, which is correct?</h1> </div> <div class="p-description"> <ul class="listInline listInline--bullet"> <li> <i class="fa--xf fal fa-user" aria-hidden="true" title="Thread starter"></i> <span class="u-srOnly">Thread starter</span> <a href="/members/acharnley.259238/" class="username u-concealed" dir="auto" data-user-id="259238" data-xf-init="member-tooltip">ACharnley</a> </li> <li> <i class="fa--xf fal fa-clock" aria-hidden="true" title="Start date"></i> <span class="u-srOnly">Start date</span> <a href="/threads/mppt-buck-duty-two-approaches-which-is-correct.161478/" class="u-concealed"><time class="u-dt" dir="auto" datetime="2021-05-01T01:50:08-0700" data-time="1619859008" data-date-string="May 1, 2021" data-time-string="1:50 AM" title="May 1, 2021 at 1:50 AM">May 1, 2021</time></a> </li> </ul> </div> </div> <div class="p-body-main p-body-main--withSidebar "> <div class="p-body-contentCol"></div> <div class="p-body-sidebarCol"></div> <div class="p-body-content"> <div class="p-body-pageContent"> <div class="block block--messages" data-xf-init="" data-type="post" data-href="/inline-mod/" data-search-target="*"> <span class="u-anchorTarget" id="posts"></span> <div class="block-outer"> <dl class="blockStatus"> <dt>Status</dt> <dd class="blockStatus-message blockStatus-message--locked"> Not open for further replies. </dd> </dl> </div> <div class="block-outer"></div> <div class="block-outer js-threadStatusField"></div> <div class="block-container lbContainer" data-xf-init="lightbox select-to-quote" data-message-selector=".js-post" data-lb-id="thread-161478" data-lb-universal="0"> <div class="block-body js-replyNewMessageContainer"> <article class="message message--post js-post js-inlineModContainer " data-author="ACharnley" data-content="post-1402438" id="js-post-1402438" > <span class="u-anchorTarget" id="post-1402438"></span> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" > <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/acharnley.259238/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="259238" data-xf-init="member-tooltip" style="background-color: #99cc99; color: #3c773c"> <span class="avatar-u259238-m" role="img" aria-label="ACharnley">A</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/acharnley.259238/" class="username " dir="auto" data-user-id="259238" data-xf-init="member-tooltip">ACharnley</a></h4> <h5 class="userTitle message-userTitle" dir="auto">Member</h5> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/mppt-buck-duty-two-approaches-which-is-correct.161478/post-1402438" rel="nofollow" > <time class="u-dt" dir="auto" datetime="2021-05-01T01:50:08-0700" data-time="1619859008" data-date-string="May 1, 2021" data-time-string="1:50 AM" title="May 1, 2021 at 1:50 AM">May 1, 2021</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/mppt-buck-duty-two-approaches-which-is-correct.161478/post-1402438" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1402438/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/mppt-buck-duty-two-approaches-which-is-correct.161478/post-1402438" rel="nofollow"> #1 </a> </li> </ul> </header> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1402438" data-lb-caption-desc="ACharnley · May 1, 2021 at 1:50 AM"> <article class="message-body js-selectToQuote"> <div > <div class="bbWrapper">Buck A or Buck B?<br /> <br /> Thevenin creates an equivalent impedance (MPPT is where in=out impedance). As the source current is fixed I used this to derive a voltage at Vin. I then tracked this voltage using the method described at Buck A. This means the duty is variable, but I also thought because the load at VL is variable this is correct. One negative is there's no load until the input voltage meets the target, so slightly less ideal power factor.<br /> <br /> Buck B uses the CCM equation (I can't find it right now but it's something like duty=V^2/R^2) but this isn't factoring that Load changes impedance.<br /> <br /> I've simulated both in LTSpice and both methods come very close in performance, however I've probably done a bad job of simulating the Load (capacitor + resistor) when in real life it's feeding into a Boost and then on to outputs.<br /> <br /> Trying to think it through logically Rthout is a fixed value. Given the current is fixed at 500mA then Vin should be Sine like, whereas Buck A is clamping it. But if I go with Buck B approach it doesn't consider the load, which changes and as I can see from LTSpice this also clamps Vin. <br /> <br /> <script class="js-extraPhrases" type="application/json"> { "lightbox_close": "Close", "lightbox_next": "Next", "lightbox_previous": "Previous", "lightbox_error": "The requested content cannot be loaded. 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As the source current is fixed I used this to derive a voltage at Vin. I then tracked this voltage using the method described at Buck A. This means the duty is variable, but I also thought because the load at VL is variable this is correct. One negative is there's no load until the input voltage meets the target, so slightly less ideal power factor.\n\nBuck B uses the CCM equation (I can't find it right now but it's something like duty=V^2/R^2) but this isn't factoring that Load changes impedance.\n\nI've simulated both in LTSpice and both methods come very close in performance, however I've probably done a bad job of simulating the Load (capacitor + resistor) when in real life it's feeding into a Boost and then on to outputs.\n\nTrying to think it through logically Rthout is a fixed value. Given the current is fixed at 500mA then Vin should be Sine like, whereas Buck A is clamping it. But if I go with Buck B approach it doesn't consider the load, which changes and as I can see from LTSpice this also clamps Vin." }, "publisher": { "@type": "Organization", "name": "Electronics Forum (Circuits, Projects and Microcontrollers)", "description": "An electronics forum to talk all about circuits and projects.", "url": "https://www.electro-tech-online.com" } } </script>  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-MMC9PJ9" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>   <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-KLX5R59" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>  <script> $(function(){ var notice = $('.xb-welcome-notice'); if(notice.length){ var cookie = XF.Cookie.get('hide_welcome_notice'); if(!cookie){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else if ((Date.now() - cookie) > 8.64e+7){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else { notice.hide(); } } }); </script> </div> </body> </html>

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MPPT & Buck Duty - two approaches, which is correct? | Electronics Forum (Circuits, Projects and Microcontrollers)