RE: Opensource CDI ignition  
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RE: Opensource CDI ignition - 7/1/2008 12:10:34 AM   
jpanhalt


 

Posts: 91
Joined: 10/4/2005
From: Parma Heights, OH, USA
Status: offline 		I can't read your schematic. The lousy JPG resolution makes reading any part identifiers almost impossible. On Bigboat's site, T1 is an ignition coil. Q1 is the thyristor.

As for why it is a thyristor, I suspect the high pulse-current capability, easy gate control circuit, and easy turn off contribute to the reason. John

(in reply to Futterama)
       Post #: 201

RE: Opensource CDI ignition - 7/1/2008 9:49:14 AM   
Futterama


 

Posts: 20
Joined: 11/10/2005
From: Them, DENMARK
Status: offline
quote:

ORIGINAL: jpanhalt
I can't read your schematic. The lousy JPG resolution makes reading any part identifiers almost impossible. On Bigboat's site, T1 is an ignition coil. Q1 is the thyristor.

Check again, I changed the attachment so it's now readable and both the bobine and the thyristor is called T1.

The attachment was created from this image:

http://www.modelbouw.gompy.net/newcdi/cdi-a.jpg

(in reply to jpanhalt)
       Post #: 202

RE: Opensource CDI ignition - 7/1/2008 5:22:28 PM   
Bigboat


 

Posts: 214
Joined: 12/6/2005
From: Alkmaar, NETHERLANDS
Status: offline 		OK, T1 can be the SCR and the coil......my mistake, and I was thinking you mean the ocsilator transistor to change into a FET (thats possible todo).
To use a FET for the SCR will cost you a fortune AND you have to make a signal to close the FET after the ignitionpuls.
A SCR will close by him self after the *ignition* becourse the *backflash* of the ignitioncoil create a negative puls.

< Message edited by Bigboat -- 7/1/2008 7:06:25 PM >

_____________________________

CU, Rob - www.modelbouw.gompy.net

(in reply to Futterama)
       Post #: 203

RE: Opensource CDI ignition - 7/5/2008 7:29:31 PM   
Futterama


 

Posts: 20
Joined: 11/10/2005
From: Them, DENMARK
Status: offline 		I bought 3 BT151-800R for 30DKR ~ $6 (USD) so I'll just use them.

I have a lot of different MOSFETs but they are low voltage (20-30V) and high power (80-150A) so because of the low voltage, they are not suitable.

Bigboat, I also bought the Velleman FLPS, and got it disassembled but I can't figure out how to wind 400 winds of 0.25mm (AWG30) copperwire onto the plastic holder.

According to my calculations and measurements on the plastic holder, there is only room for 365 windings on 3 "sections" and the last section is used for the 0.5mm (AWG24) wire, and I tried to wind 20 windings with AWG24 and it can barely fit.

How did you wind it? Did you remove the wall seperating the sections to get more room for windings?

(in reply to Bigboat)
       Post #: 204

RE: Opensource CDI ignition - 7/5/2008 8:03:32 PM   
Bigboat


 

Posts: 214
Joined: 12/6/2005
From: Alkmaar, NETHERLANDS
Status: offline
quote:

Did you remove the wall seperating the sections to get more room for windings?


Yes.

_____________________________

CU, Rob - www.modelbouw.gompy.net

(in reply to Futterama)
       Post #: 205

RE: Opensource CDI ignition - 8/17/2008 9:58:06 AM   
rudrich


 

Posts: 1
Joined: 8/17/2008
From: , GERMANY
Status: offline 		Hi BigBoat,

sorry for I guess asking again, but did anyone ever find a coil that would fit and is buyable to use as transformer in the HV PCB? I'm no very good in winding coils...


Best,
Phil

< Message edited by rudrich -- 8/18/2008 11:17:08 AM >

(in reply to Bigboat)
       Post #: 206

RE: Opensource CDI ignition - 9/19/2008 9:31:12 AM   
geaditk


 

Posts: 1
Joined: 9/19/2008
From: Phitsanulok, THAILAND
Status: offline 		Hi to all i'm from thailand, i'm intresting in build a 2 strokes ignition system.
i'm not understand about pickup position degrees use in Source1.asm
please tell me the Information form my motorbike in my pictupe.
Thank you very much
Geaditk

(in reply to rudrich)
       Post #: 207

RE: Opensource CDI ignition - 9/19/2008 5:02:32 PM   
Bigboat


 

Posts: 214
Joined: 12/6/2005
From: Alkmaar, NETHERLANDS
Status: offline 		If the original ignitionpoint of your engine 38 degrees BTDC, you have to place the pick also 38 degrees BTDC.
At the start of the engine, the CDI-software will change the ignitionpoint to 5 degrees BTDC (easystart position).
If the engine runs 1800 RPM, the ignitionpoint change to 38 degrees BTDC.
Now comes the most important thing you have todo..........make the ideal curve.
At high RPM, the ignitionpoint have to change a few degrees more (38 degrees+ X-degrees)
With the ideal curve, your engine makes more RPM and get more power.

_____________________________

CU, Rob - www.modelbouw.gompy.net

(in reply to geaditk)
       Post #: 208

RE: Opensource CDI ignition - 10/7/2008 12:07:23 PM   
Futterama


 

Posts: 20
Joined: 11/10/2005
From: Them, DENMARK
Status: offline 		Bigboat, can you explain why the B1 high voltage transformer is separated into 3 coils?

If someone told me to generate high voltage, I would just use a square AC on a single primary winding.

(in reply to Bigboat)
       Post #: 209

RE: Opensource CDI ignition - 10/7/2008 2:36:53 PM   
Bigboat


 

Posts: 214
Joined: 12/6/2005
From: Alkmaar, NETHERLANDS
Status: offline 		One of this coils is the ocsilator together with the Resistor, Condensator and Transistor.
It's impossible to create with a normal AC-transformer the same.

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CU, Rob - www.modelbouw.gompy.net

(in reply to Futterama)
       Post #: 210

RE: Opensource CDI ignition - 10/9/2008 1:58:03 PM   
Phatburner


 

Posts: 1
Joined: 10/9/2008
From: , ON, CANADA
Status: offline 		Hi Bigboat;

I have been reading this forum and the related materials. Thank you for all your work and sharing. I am trying to find out what is the frequency of the free running oscillator in the inverter? Does it run fast enough to allow triggering of multiple sparks?


(in reply to Bigboat)
       Post #: 211

RE: Opensource CDI ignition - 10/9/2008 3:49:47 PM   
Bigboat


 

Posts: 214
Joined: 12/6/2005
From: Alkmaar, NETHERLANDS
Status: offline 		Test let us see we can run over 30.000 rpm with a good and bright spark.

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CU, Rob - www.modelbouw.gompy.net

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       Post #: 212

RE: Opensource CDI ignition - 11/11/2008 7:22:47 PM   
aerodactyl


 

Posts: 5
Joined: 11/5/2008
From: Detmold, GERMANY
Status: offline 		Hi to all people interested in CDI's.
My name is Uwe and I'm from Germany. Please excuse my none perfect English. The reading of this thread was really interesting and you did already a good job, especially bigboat from NL.

Years ago I tried to build a CDI by myself, but just with medium success. The base I use is slightly different to the version your are talking here. I work with an external oscillator for the DC intermediate circuit. The rest looks very similar. Basically my system works but I have problems to raise the voltage fast enough for high speed engines. The best result I ever reached was 6 ms for 150V in a 0.47 µF capacitor after the fire signal. My target is to reach less than 3 ms as it was reached with the poor system described in an article od Floyd E. Carter. Unfortunately I couldn't find the link any more. The way how to create the DC voltage is the same as the version of bigboat.
I already read the full thread but I couldn't find any no. of ms or a scope diagram. But if the CDI will go up to 30000 RPM the time have to be less than 3 ms.
The problem I encounter is the "transformer". I tried different version but with no success. I found out using a ferrite ring is more insensitive to frequency variations of the oscillator than other versions.
Before ordering the FLPS board just to have the e-core is somebody of you able to tell me your reached values of:
- max. DC voltage
- raise time up to 150V
- used capacitor (µ47F?)

Would be nice if you could support me with some technical details.
Thanks in advance.
Uwe

(in reply to Bigboat)
       Post #: 213

RE: Opensource CDI ignition - 11/11/2008 7:44:50 PM   
Bigboat


 

Posts: 214
Joined: 12/6/2005
From: Alkmaar, NETHERLANDS
Status: offline 		Hi Uwe,

If you buy the FLPS-boards, you have rewinde the core......you can't use the core like he is.
If you can buy a HF-E-core it will work too.
Our HV-coil makes about 400 till 600 Volt, depent how the coil is wind and how the ocsilator is working.
Raisetime untill 150 Volt less than 3ms, 400 till 600 Volt within 3ms

_____________________________

CU, Rob - www.modelbouw.gompy.net

(in reply to aerodactyl)
       Post #: 214

RE: Opensource CDI ignition - 11/11/2008 8:07:02 PM   
aerodactyl


 

Posts: 5
Joined: 11/5/2008
From: Detmold, GERMANY
Status: offline 		Hi Rob,

thanks for the fast reply.
I made tests with a coil where 2 E was "inserted". I bought http://www1.conrad.de/scripts/wgate/zcop_b2c/~flNlc3Npb249UDkwV0dBVEU6Q19BR0FURTEyOjAwMDEuMDA3NC4xODEyZWVmYiZ+aHR0cF9jb250ZW50X2NoYXJzZXQ9aXNvLTg4NTktMSZ+U3RhdGU9MjMxODc4Mzk0Ng==?~template=PCAT_AREA_S_BROWSE&mfhelp=&p_selected_area=%24ROOT&p_selected_area_fh=&perform_special_action=&glb_user_js=Y&shop=B2C&vgl_artikel_in_index=&product_show_id=&p_page_to_display=DirektSearch&~cookies=1&zhmmh_lfo=&zhmmh_area_kz=&s_haupt_kategorie=&p_searchstring=516643&p_searchstring_artnr=516643&p_searchstring_manufac_artnr=&p_search_category=alle&fh_directcall=&r3_matn=&insert_kz=&gvlon=&area_s_url=&brand=&amount=&new_item_quantity=&area_url=&direkt_aufriss_area=&p_countdown=&p_80=&p_80_category=&p_80_article=&p_next_template_after_login=&mindestbestellwert=&login=&password=&bpemail=&bpid=&url=&show_wk=&use_search=3&p_back_template=&template=&kat_save=&updatestr=&vgl_artikel_in_vgl=&titel=&darsteller=®isseur=&anbieter=&genre=&fsk=&jahr=&jahr2=&dvd_error=X&dvd_empty_error=X&dvd_year_error=&call_dvd=&kna_news=&p_status_scenario=&documentselector=&aktiv=&gewinnspiel=&p_load_area=$ROOT&p_artikelbilder_mode=&p_sortopt=&page=&p_catalog_max_results=20this.

Is it similar to the core of FLPS?

Uwe

(in reply to Bigboat)
       Post #: 215

RE: Opensource CDI ignition - 11/11/2008 9:01:05 PM   
Bigboat


 

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