Re: K5 Pointy Headlight Connector Burning out
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Originally Posted by SV650rules
Quote:
Originally Posted by glang
I think were talking the same but theres something here I dont agree with:
Those thyristors act as crude crowbars to short circuit across the generator, causing voltage drop because of the internal resistance of the alternator. They're on/off devices and connected parallel to the load, so they operate independently of load current
Thyristors/transistors are not on/off devices but variable chokes that are controlled by the regulator depending on system voltage. As you then say the current they let through isnt absorbed by the R/R but generates heat as it passes through the transistors which must be dissipated to avoid damaging them.
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A basic thyristor is an on/off device - it can be triggered but will only turn on when it is forward biased, and it will not turn off until voltage across it drops to zero or goes reverse - an igbt thyristor can be turned off by removing gate supply at any time. a device that is in some conductive state other than fully on will dissipate a lot of heat - that is why square wave power supplies are more efficient - the switching device is either fully on or off. |
Quote:
Originally Posted by glang
Ok the wonderful internet does say that thyristors only switch but transistors can control as an amplifier so surely we have the latter in our R/R?
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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!)
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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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