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A brown-out alternative?
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user9253



Joined: 28 Mar 2008
Posts: 1436
Location: Riley TWP Michigan

PostPosted: Fri Jan 04, 2019 4:57 am    Post subject: Re: A brown-out alternative? Reply with quote

It would be an interesting experiment to see if the brownout-DC-DC converter
would work without the relay. The purpose of the relay is to provide
milliseconds of delay in opening the circuit after cranking the engine. When the
engine starts, human reaction time for releasing the start button provides a
delay. If the engine does not start, the need for a delay depends on the battery
voltage. Doesn't the battery voltage start recovering within a few milliseconds
after engine cranking begins?


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PostPosted: Fri Jan 04, 2019 6:54 am    Post subject: A brown-out alternative? Reply with quote

At 06:57 AM 1/4/2019, you wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>

It would be an interesting experiment to see if the brownout-DC-DC converter
would work without the relay. The purpose of the relay is to provide
milliseconds of delay in opening the circuit after cranking the engine.

Yes, a delay greater than the dropout delay
in the starter contactor.


Quote:
When the
engine starts, human reaction time for releasing the start button provides a
delay. If the engine does not start, the need for a delay depends on the battery
voltage. Doesn't the battery voltage start recovering within a few milliseconds
after engine cranking begins?

Usually . . . if the battery is
relatively robust and in good
condition. Try it without
the relay. It can't do anything
worse than not work.



Bob . . .


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zwakie



Joined: 03 Aug 2009
Posts: 155

PostPosted: Sun Jan 20, 2019 5:57 am    Post subject: Re: A brown-out alternative? Reply with quote

Update: yesterday I tested to see how well the DC-DC converter does its job with a battery in less than optimal condition (12.1 Volts without any loads on it).

I saw that the output voltage of the DC-DC converter dropped to 9.85 Volts initially and quickly (well below 1 second) recovers to the set point of 12.5 Volts.

This 9.85 Volts is well above the brownout point for my EFIS so it still is no issue for me, but I thought it would be worthwhile to share, so others are aware that the DC-DC converter takes some time to reach the set point voltage when battery voltage is lower than normal.


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