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Classic Goldwing Technical Forums
Lighting & Electrical
GL1100 (Standard) - Saving watts through LEDs (Chart)
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<blockquote data-quote="DaveKamp" data-source="post: 213483" data-attributes="member: 5122"><p>The video MOSFET vs. Shunt is inaccurate in name. Both systems are shunt type... as they shunt excess to ground.</p><p></p><p>Most of the shunt regulators built for motorcycles, snowmobiles, and outboard motors after 1980ish used MOSFETs... (Metal Oxide Semiconductor Field Effect Transistors). Prior to that, common Bipolar Transistors were used. When I converted my GN400 from 6v to 12v electrics, I used a pair of TIP120C bipolars triggered by a 12v zener and three 1n4002's in series (that's 12+.6+.6+.6 for 13.8v) as my gating threshold. </p><p></p><p>The only difference between the MOSFET, and any other shunt system, is that the MOSFET is more sensitive, and has lower series resistance than a standard bipolar.</p><p></p><p>No matter how you do it, a shunt-regulated system is 100% total loss- whatever the stator coil puts out, becomes 100% (plus a few for losses) crankshaft load, and 100% heat. The only difference is how you use it- either it'll go to operating devices, or it'll go to heating the coils, regulator, and ground return path.</p><p></p><p>Here's a nice writeup, with illustration, and a comparison table to boot:</p><p><a href="https://www.polytechnichub.com/difference-shunt-voltage-regulator-series-voltage-regulator/" target="_blank">https://www.polytechnichub.com/differen ... regulator/</a></p><p></p><p>Perhaps I should sit down and draw diagrams of them, and then one of a common alternator system, include current flow, power calculations, and graph them through operational load ranges and transient excursions... but I still have nice weather, so I gotta get outside and get work done. Mebbie later.</p></blockquote><p></p>
[QUOTE="DaveKamp, post: 213483, member: 5122"] The video MOSFET vs. Shunt is inaccurate in name. Both systems are shunt type... as they shunt excess to ground. Most of the shunt regulators built for motorcycles, snowmobiles, and outboard motors after 1980ish used MOSFETs... (Metal Oxide Semiconductor Field Effect Transistors). Prior to that, common Bipolar Transistors were used. When I converted my GN400 from 6v to 12v electrics, I used a pair of TIP120C bipolars triggered by a 12v zener and three 1n4002's in series (that's 12+.6+.6+.6 for 13.8v) as my gating threshold. The only difference between the MOSFET, and any other shunt system, is that the MOSFET is more sensitive, and has lower series resistance than a standard bipolar. No matter how you do it, a shunt-regulated system is 100% total loss- whatever the stator coil puts out, becomes 100% (plus a few for losses) crankshaft load, and 100% heat. The only difference is how you use it- either it'll go to operating devices, or it'll go to heating the coils, regulator, and ground return path. Here's a nice writeup, with illustration, and a comparison table to boot: [url=https://www.polytechnichub.com/difference-shunt-voltage-regulator-series-voltage-regulator/]https://www.polytechnichub.com/differen ... regulator/[/url] Perhaps I should sit down and draw diagrams of them, and then one of a common alternator system, include current flow, power calculations, and graph them through operational load ranges and transient excursions... but I still have nice weather, so I gotta get outside and get work done. Mebbie later. [/QUOTE]
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Lighting & Electrical
GL1100 (Standard) - Saving watts through LEDs (Chart)
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