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email(at)jaredyates.com
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 Posted: Mon Aug 15, 2022 6:24 pm Post subject: Reverse Engineering an Ultralight Charging System |
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I'm puzzled by a very simple and basic charging system and I suspect that the great minds on the list might be able to help figure out how it works. The manufacturer hasn't been forthcoming about the circuitry.
Here is the extent of the technical documentation that I have found so far:
http://vittorazi.com/manuali/Quick_wiring_Vittorazi_Moster185_electric_starter_eng.pdf
This is a small single-cylinder 2-stroke engine. The flywheel has a permanent magnet, and there is a coil at the top for generating the spark. There is a similar coil at the bottom that is intended to charge the battery. The coils are grounded to the engine case, and on the charging coil, there is a single wire that exits the coil and goes to a small potted device that is presumably a regulator and rectifier. It has three conductors: one for the coil output, one for the battery charge, and a ground. I would guess that the coil is creating an AC current with a frequency related to the engine RPM.
It seems like most of the lawn mower regulator/rectifiers have two wires for the incoming AC, then one wire for the outgoing DC, plus a grounded case. What stumps me about this one is that since the gadget in the circuit only has three wires and an insulated case, it must mean the AC voltage happens between the engine ground and the single coil output wire. I haven't yet put a multimeter on the leads while the engine is running but I suppose that would be good data.
Through a set of unrelated circumstances, I fried the included factory regulator circuit, and while I could buy another one from the Italians for $50, it seems like a good opportunity to better understand how this system works. It may be possible to make a better circuit, since there are complaints that the factory circuit drains the battery if it isn't disconnected after each flight. The factory system is intended for a sealed lead acid battery. My end goal is to provide some charging energy to the tiny lithium iron phosphate battery, which is the smallest EarthX with its own little BMS. Currently the battery is working fine to run the starter motor and strobe light, but I'm sure it will require occasional recharging if I don't work up some circuitry to charge while in flight.
I'm tempted to try a bridge rectifier and some type of voltage regulating circuit. Any ideas?
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user9253
Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan
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| Posted: Tue Aug 16, 2022 4:40 am Post subject: Re: Reverse Engineering an Ultralight Charging System |
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Is it physically possible to disconnect the AC coil wire from ground and splice
it to a longer wire that can be connected to a voltage regulator?
Then you can use a lawn mower voltage regulator. eBay item number:
324332725292 costs $13 with free shipping.
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Joe Gores |
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user9253
Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan
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| Posted: Tue Aug 16, 2022 5:15 am Post subject: Re: Reverse Engineering an Ultralight Charging System |
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Looking at the "Actual Circuit" diagram on page 4 of the Vittorazi documentation,
a diode is internal to the dynamo. So the blue wire output of the dynamo is DC, not AC.
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Joe Gores |
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email(at)jaredyates.com
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| Posted: Tue Aug 16, 2022 9:43 am Post subject: Reverse Engineering an Ultralight Charging System |
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Thank you Bob and Joe! I will try the mower regulator with disregarding one
of the yellow wires and grounding to the case.
On Tue, Aug 16, 2022 at 1:18 PM Robert L. Nuckolls, III <
nuckolls.bob(at)aeroelectric.com> wrote:
[quote] At 09:22 PM 8/15/2022, you wrote:
I'm puzzled by a very simple and basic charging system and I suspect that
the great minds on the list might be able to help figure out how it works
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