Re: dc/dc converter 12/200V

Hi Jim,

I have take a second look at the schematic but i don't see how it works.
The only thing i can think of is that because the turning off Q1 if the
current is 5A trough L1 there a induction counter to the current is being
created.
That energie goes in C1 until Q1 is turning on and is pulling that energie
trough the ignition coil.
If this is not the case, can you explain in short how it works?
btw. Sorry for my bad english. I op you understand what i try to say.

Jan


"Jim Thompson" <thegreatone@xxxxxxxxxxx> schreef in bericht
news:8jp261ts6bukl4euoqermtnbir2od68jej@xxxxxxxxxx
> On Sat, 16 Apr 2005 21:14:19 +0200, "Jan Heijkamp" <setje@xxxxxxxxxxx>
> wrote:
>
>>Your solution is not what i am searching for
>>Here the pro for CDI ignition.
>>
>>CDI stores the ignition energy in an electric field of a capacitor,
>>Inductive ignition stores the energy in the magnetic field of an inductor
>>(coil). The CDI can switch a large current through a low
>>inductance/resistance pulse transformer very quickly so it is suitable for
>>extreme spark rates.
>>Inductive ignition needs time (dwell) to fill the coil with energy and
>>time
>>to discharge that energy hence the longer spark duration of the inductive
>>system. A coil that is optimised for CDI system will not work properly
>>with
>>an Inductive System and vice-versa. Commercially available CDI systems
>>can
>>reliably push 150 amps at 450 volts or more through the primary windings
>>of
>>a CD pulse transformer but do so in tens of microseconds so it works much
>>better at high revs.
>>
>>Jan
>>
>
> Wrong. My example is NOT inductive "storage"... it's CONVERT PER
> FIRING... the example shown can manage a firing every 2.25ms with the
> battery at 12VDC. AND: It HAS been run on many high RPM V8's, for
> YEARS... not a FIGMENT like lots of designs seen here on S.E.D ;-)
>
>>
>>"Jim Thompson" <thegreatone@xxxxxxxxxxx> schreef in bericht
>>news:bme261lenefta1ne07j5nahl8vuqbr7cco@xxxxxxxxxx
>>> On Sat, 16 Apr 2005 18:03:10 +0200, "Jan Heijkamp" <setje@xxxxxxxxxxx>
>>> wrote:
>>>
>>>>Hi,
>>>>
>>>>
>>>>
>>>>I am building a cdi ignition for my motorbike.
>>>>
>>>>There is enough available on the web but I can not find how to make a
>>>>dc/dc
>>>>converter that is small enough to place on a motorbike. What I have
>>>>found
>>>>has a large transformer.
>>>>
>>>>I need a dc/dc 12/200V converter and the power is approximately 20 watt.
>>>>
>>>>Knows anyone how to build this converter?
>>>>
>>>>
>>>>
>>>>Tia
>>>>
>>>>
>>>>
>>>>Jan
>>>>
>>>>
>>>>
>>>
>>> Why do it in to steps, conversion, then firing circuitry.
>>>
>>> Do it in one pass, see....
>>>
>>> http://www.analog-innovations.com/SED/CD-Ignition-Basic.pdf
>>>
>>> ...Jim Thompson
>>> --
>>> | James E.Thompson, P.E. | mens |
>>> | Analog Innovations, Inc. | et |
>>> | Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
>>> | Phoenix, Arizona Voice:(480)460-2350 | |
>>> | E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
>>> | http://www.analog-innovations.com | 1962 |
>>>
>>> I love to cook with wine. Sometimes I even put it in the food.
>>
>
>
> ...Jim Thompson
> --
> | James E.Thompson, P.E. | mens |
> | Analog Innovations, Inc. | et |
> | Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
> | Phoenix, Arizona Voice:(480)460-2350 | |
> | E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
> | http://www.analog-innovations.com | 1962 |
>
> I love to cook with wine. Sometimes I even put it in the food.


.

Loading