Author Topic: Edwards 5 Cylinders.  (Read 13001 times)

Offline Admiral_dk

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Re: Edwards 5 Cylinders.
« Reply #135 on: January 03, 2020, 09:02:35 PM »
Quote
Maybe the board is connected the right way??

Absolutely possible - I have made similar errors in my constructions @ work - especially if we get the same standard part in a new "house" (casing or what you prefer to call them) and suddenly two or more pins are swapped on the next PCB and you can't find why it suddenly doesn't work, until you realized what happened.

Here the regulator IC will try to supply the necessary current if it can without the help of the transistors - if this is possible, it will still work (the plugs get hot enough to start the engine) ....

I also had a few errors made over the years, where I did the symbols wrong in the library after an update and printed an already working construction to the Boss as he wanted a schematic, and he came back and tells me this can't be working as I have swapped the Collector and Emitter pins - just like your schematic here  :-[

Oh and just to inform those who will ask what the Collector and Emitter pins are :
If you look @ the 2N2905 symbol in the schematic - Pin 1 = Emitter, Pin 2 = Base and Pin 3 = Collector.
The current flowing between Collector and Emitter is controlled from the current flowing from Base to Emitter and is HFe (the amplification factor) times stronger.
I will not go any deeper as this is not an electronic site ....

Offline glorfindel

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Re: Edwards 5 Cylinders.
« Reply #136 on: January 14, 2020, 04:30:02 PM »
Soooooooo, you were right!!! ;-)

It was functional, but it was heating a lot.

Now, it's ok, we changed the side ;-)

Thx sir!!!!

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Offline Admiral_dk

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Re: Edwards 5 Cylinders.
« Reply #137 on: January 14, 2020, 10:18:46 PM »
Glad that I could be of help with this  :cheers:

If you want to help others even more - please update the schematic here ....

Offline glorfindel

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Re: Edwards 5 Cylinders.
« Reply #138 on: January 14, 2020, 10:29:25 PM »
Glad that I could be of help with this  :cheers:

If you want to help others even more - please update the schematic here ....
I'll do it tomorrow, thx again.

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Offline petertha

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Re: Edwards 5 Cylinders.
« Reply #139 on: January 15, 2020, 12:28:30 AM »
Not that I would understand either schematic, but is your board a different principle than this?
http://philsradial.blogspot.com/2013/02/glowplug-driver.html

Offline glorfindel

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Re: Edwards 5 Cylinders.
« Reply #140 on: January 15, 2020, 02:30:59 AM »
Not that I would understand either schematic, but is your board a different principle than this?
http://philsradial.blogspot.com/2013/02/glowplug-driver.html
Look like it's more advanced than mine.

Hopfully, Admiral_dk will chime in to help us understand those circuits lol!! ;-)

I suck at electronic stuff.



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Offline Admiral_dk

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Re: Edwards 5 Cylinders.
« Reply #141 on: January 15, 2020, 11:38:07 AM »
It is more advanced - but also not complete, and full off construction errors  :facepalm:

I'm sure it is supposed to work the same way as somebody I knew many years ago did one. The MCU (MicroControlUnit - a kind of CPU) sequentially swiches on of the power MosFET's on for a very short time, waits a bit and turns on the next in the sequence, etc..
The positive terminal on the battery is connected to the engine and each Glowplug is connected to the Drain terminal on one of the MosFET's and the Source terminal is conneted to the Negative terminal on the battery.
This kind off system must run at high speed as it uses the fact, that the wire inside the glowplug is coiled and has a smal inductance. This inductance is a very important part of almost al kinds of Switch-Mode Power Supplies (SMPS).
The smart part of this approach, is a much reduced power loss => longer battery life + usually fewer components used.