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Internally Regulated Over Voltage Protection

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BMC_Dave

Joined: 04 Jul 2018
Posts: 40

Posted: Sun Jan 13, 2019 8:01 pm Post subject: Internally Regulated Over Voltage Protection

I see that schematics for providing over voltage regulation on internally regulated alternators have been scrubbed: http://www.aeroelectric.com/DIY/DIY_Crowbar_OVP_F.pdf



Looks like the last rev was in 2005. Has there been any changes in thinking in the last 14 years as to the use of internally regulated alternators? Is there possibly an example of this safety features use on an IR alternator I can see so I can at least have the information? Any help is greatly appreciated, thanks.

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BMC_Dave

Joined: 04 Jul 2018
Posts: 40

Posted: Sun Jan 13, 2019 9:01 pm Post subject: Re: Internally Regulated Over Voltage Protection

After finding Z-24 I wonder if leaving the ebus alt feed closed normally would help with load dumps for in flight switching off of the alternator?



The easiest solution is to turn off the engine first when shutting down.

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BMC_Dave

Joined: 04 Jul 2018
Posts: 40

Posted: Mon Jan 14, 2019 10:47 am Post subject: Re: Internally Regulated Over Voltage Protection

Adding to the questions, are there any negatives to leaving the e-bus alt feed closed for normal operations? Or would an additional diode between the e-bus alt feed and diode be prudent to avoid alternators trying to charge the battery through the alt feed?

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BMC_Dave

Joined: 04 Jul 2018
Posts: 40

Posted: Tue Jan 15, 2019 3:10 pm Post subject: Re: Internally Regulated Over Voltage Protection

Bueller

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user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Tue Jan 15, 2019 5:41 pm Post subject: Re: Internally Regulated Over Voltage Protection

Most of the battery charging current will come through the battery contactor.

Very little, if any will pass through the E-Bus diode.  Another diode between

the battery and E-Bus is not desired because it will drop voltage.  Not good if the battery voltage is low.

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Joe Gores

BMC_Dave

Joined: 04 Jul 2018
Posts: 40

Posted: Wed Jan 16, 2019 9:50 am Post subject: Re: Internally Regulated Over Voltage Protection

 	  user9253 wrote: 	
		  Most of the battery charging current will come through the battery contactor.

Very little, if any will pass through the E-Bus diode.  Another diode between

the battery and E-Bus is not desired because it will drop voltage.  Not good if the battery voltage is low. 	




Awesome, thank you.

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