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04-10-18, 08:04 AM | #31 | |
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Re: K5 Pointy Headlight Connector Burning out
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The larger diodes have a bigger surface area to dissipate the extra heat, the voltage drop stays the same within the current rating of the diode, after that you get thermal runaway and smoke
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04-10-18, 08:13 AM | #32 | |
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Re: K5 Pointy Headlight Connector Burning out
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04-10-18, 10:42 AM | #33 | |||
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Re: K5 Pointy Headlight Connector Burning out
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I would have expected to see a different symbol for IGBT. (I admit that I don't recognise the term "IGBT Thyristor" - I suspect it's what I know as just an IGBT?) Quote:
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However, your thought process is reasonable: This is essentially why those who recommend upgrades suggest MOSFET R/Rs. More complex semi-conductors but the premise is better control with less heat production and so greater performance and reliability. However, as mentioned by SV650rules, R/Rs use a switch-mode technique, rapid full on/off switching that leads to an averaging effect in a relatively slow-responding load. Transistor or thyristor, they won't try to partially throttle current flow like a variable resistor or an audio amp would.
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Spannering the wife's SV650S K5 pointy in Black, and son's SV650 X curvy in Blue. RIP SV650 X curvy, crashed and written off December 2019. I'm (procrastinating about) fixing up an old Yamaha FZ600 to get myself fully back on the road. Last edited by Ruffy; 04-10-18 at 10:46 AM. Reason: Typo corrected. |
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04-10-18, 11:06 AM | #34 | ||
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Re: K5 Pointy Headlight Connector Burning out
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Spannering the wife's SV650S K5 pointy in Black, and son's SV650 X curvy in Blue. RIP SV650 X curvy, crashed and written off December 2019. I'm (procrastinating about) fixing up an old Yamaha FZ600 to get myself fully back on the road. Last edited by Ruffy; 04-10-18 at 11:07 AM. Reason: Updated |
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04-10-18, 11:06 AM | #35 |
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Re: K5 Pointy Headlight Connector Burning out
i would like to take an R/R apart to see whats inside.
i dont understand why there is no dropdown transformer to help the regulation. the whole system works exactly like a power supply except the mains is generated power. AC power (stator) - "Rectification - DC power - Regulation" (R/R) - Smoothing Capacitor (battery). the only thing missing is a drop down transformer before the Rectification. if you dropped say the 90v AC to a more suitable 20V AC then the R/R would not have to work as hard. |
04-10-18, 11:29 AM | #36 | |
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Re: K5 Pointy Headlight Connector Burning out
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You're correct, it is a power supply but in this case I don't think a separate transformer would really add anything. Yes, the R/R would work less hard but the transformer would take the strain instead. A marketing man might say the R/R was a digital transformer rather than a traditional analogue one! You could achieve similar voltage reduction by changing the coil configuration of the alternator but there would be consequences for the winding wiring sizes, to be able to supply the same power output. (Fewer turns for lower voltage output , larger cross-sectional-area for increased current.) This has mechanical and thermal implications. The alternator is effectively a secondary coil of a transformer and there's nothing to be gained overall by adding a second separate transformer when everything is so close together. I think we're in to the realms of engineering compromise at a system level.
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Spannering the wife's SV650S K5 pointy in Black, and son's SV650 X curvy in Blue. RIP SV650 X curvy, crashed and written off December 2019. I'm (procrastinating about) fixing up an old Yamaha FZ600 to get myself fully back on the road. |
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04-10-18, 12:18 PM | #37 |
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Re: K5 Pointy Headlight Connector Burning out
glang, I just had another thought that may help you: Compare the size of the R/R (which is probably capable of dealing comfortably with up to 150W) to the heatsink on even a small size audio power amp. I think you'll find a much larger heatsink on an equivalent audio amp and this physically shows the extra heat implications of trying to variably control the power flow. Hence why R/Rs use switching techniques, even transistor regulated ones (although it does mean that the alternator coils and wiring have to take the thermal strain - there's nowt for free!)
Dont forget though that theres far more forced cooling available on a moving bike especially as, handily, more speed equals more heat to be dissipated..... |
04-10-18, 12:47 PM | #38 |
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Re: K5 Pointy Headlight Connector Burning out
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04-10-18, 03:14 PM | #39 | |
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Re: K5 Pointy Headlight Connector Burning out
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04-10-18, 03:24 PM | #40 |
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Re: K5 Pointy Headlight Connector Burning out
as far as i know it dont work like that. the AC will rise and fall slightly with engine speed but not load. i could be wrong though.
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