Nunotec

Good Evening Mr Rob (Gompy)


Have you got idea , when it will be ready your package?

It is adaptable to small motorbikes? I Would like to buy to test on my scooter one version of yours.

Please could you email me : [email protected]

Best Regards

Nuno

CheeseE

hi Guys!
I'm back on the forum, after a while (i'm the guy who also made a programable cdi with real time monitoring and on the fly programing)

heru

dear gompy,

ok i know. can you send me email about detail how to ship to my country.?
do you have paypal account?
this is my email : [email protected]

nyemi

Hi Gompy
Congratulations Gompy.
I'm not competing with you.
I'm looking for a good, ignition delay curves.
[youtube]http://youtu.be/wBt48RQyMMU[/youtube]
youtu.be/wBt48RQyMMU
Regards nyemi

Gompy

I have a great programmer

nyemi

Hi Gompy
You made ​​codes, engine practical operation, a video?
I'm very curious, 2t engine.
Because the proof of the pudding is in the eating.
Thank you.

Regards nyemi

Gompy

We have to test it on our own bikes and modelengines.
When we are 100% ready, we will announce everyone.
But first I have to make a powersupply out of the bike to feed the low (5V) Voltage part.
NO, we don't make a fast run...this time we deliver a ready to use product without bugs.

nyemi

Thank you for your response. I'll wait. The perfect operation.

12 Volts - 5 Volts want?
Current value?

captinjohn

Who is he....your Grandson????

shamino

i' built nyemi ZVS , but i got some problem , anyone help ? i' tried to contact nyemi via google , but he' not there.

only the HV part , Q1 Q2 are IRFZ44 , L1 330uH,2A , C1 104-250v , Q1 Q2 , L1 keep heating up , no HV. supply voltage 5v and 12v.

all diode using bym26E ( rating 1000v , 2.3A) values in schematic for easy component placing.

propellantchem

Looks like you've got Q1+Q2 turned full on. Are you sure you're diagram is correct? You have two voltage dividers R3/R1 and R4/R2 feeding DC to Q1,Q2 and you've grounded the output of Q1, Q2, sure as hell they're going to get hot.

I assume P1,P2 are supposed to be the primary windings?
If you're feeding this with DC, your primary coil will act like a dead short feeding Q1+Q2 with full supply voltage

If you put a momentary switch on the power supply, do you get a pop at the output?

nyemi

Hi Shamino

Sorry late reply.
The problems from:
IRFZ 44 No Logic fet !!!
Please apply:
IRL540 N-Channel HEXFET Power MOSFET(logic fet)
D2, D3, diode = 6.8 V/0,5W (High thermal stability)
C1 calibration:HV inverter frequency 33-35kHz

Please write down transformer data.
Primary number of turns:2* __?
Secondary number of turns:___?
Ferrite core section:___cm2
I will calculate for you.
Link:http://www.bcae1.com/trnsfrmr.htm
My calculations:
Primary voltage:14,4V(power)*3,14=45,216V!!
Target Flux Density:1500mT Gauss (No hot ferrite core)
Operating Frequency:33000 Hz (C1=150nF/250V MPP)
Core Area (cross section): 1cm2 (EI 28)
Primary number of turns:2* 11 turns(calculated:22,8) Cu 0,7mm(Attach loose. outside the primary!)
Primary 2 lines, winding!
Secondary 4 lines, winding! (just pair, no 3-5 lines, Not abandoned the line!)
Choke coil:220uH/2A



Regards nyemi

shamino

Thank you nyemi,i built some pcb , the first one working with 4.7v Zener and irfz44 ,so lucky am I ,so I changed pcb to fit in case then change fet to irf540(can't find irl540 here) then got above problem , after read your reply ,I changed Zener diode to 6.2 v (currently have in my hand) its working
i'm using ei core 22 , 170 sec .17x2 pri,inductor is 220/2a cap is 154/250v , freq 30khz ,so to get more freq ,use lower cap ?

Tidnab

My Feedback: (51)

Will this be ready and for sale before the second coming of the Lord ?

Gompy

@Nyemi,

Wat do you mean with:

Primary 2 lines, winding!
Secondary 4 lines, winding! (just pair, no 3-5 lines, Not abandoned the line!)

Wat you want is secondairy 0,2mm = 4x 0,05mm twisted pair ?
And primairy 2 lines, just two wires next to each other ?

I try to ingreas the schematic and make it usefull for model engines, but even with small power consumtion (<25mJ) some HV-parts will be hot.

shamino

i built this , 220uH L coil ,C is 104 400V,mosfet IRLI540 , 4.7v zener ( tried 6v8 zener) with the same result , Transformer using ferit powder core EI22 ( core area 0.6x0.6 = 0.36cm2 ) primary 17x2 , sec 170 , primary outside sec. . output capacitor is 105 , 630V
its work flawlessly , strong spark , but FET , transformer getting hot when running about 10-15 minutes , i can add heatsink to mosfet , but how about transformer ?
it's get overheat at high rpm(~ 10k rpm) , draw nearly 2A@12V , and resonance frequency drop from 33khz to 24-25khz. tested on test bench and real motocycle ( single cylinder)
i think about limit current to circuit , add some power resistor ?

Nav-Aids

There are 3 things you can do, increase the current capacity (wattage) of the transformer and use a heatsink for the FET, or reduce the input voltage, which will reduce the current and overall power, or limit the current, this will also reduce the overall power. With the 4.7 zeners you could go down to say 6 volts. Try it and see what happens.

Ray

nyemi

Hi Shamino
I ask you:
Secondary coil: the bottom?
Primary Coil: top?

https://docs.google.com/file/d/0BxQH...it?usp=sharing
Air gap? (0,1-0,2 mm)
Experiments demonstrate correct 1:10 ratio. Power 12-14V, Secondary voltage~120-140Vx1,41 x2=338--395V)
Use of primary 2x20 winding, secondary 200 winding .
To reduce the ferrite core saturation.
I am using EI28: 2x11 primary winding thread.
Secondary winding 110-120.
No hot components.
Small ferrite cores = low performance.
What kind of performance do you prefer?

shamino

Thanks NAV-AIDS and nyemi.
EI22 is rating at 10W , EI28 rating at 20W
wound secondary coil first , primary on top , primary is 2x17 , sec is 170 , input is 12v , output is 338V , and there is no space on transformer to add more winding , i think i must change my transformer to bigger core.EE25 (15W) or EI28(20W)
// i tried to stay with EI22 because it small enought to make it compact design

to NAV-AIDS : tried with 5v ( using PC PSU ) output voltage ~ 150V , it's a huge drop in output when load increase.


another question : how to calculate inductance of primary winding ? in zvs theory , the resonance frequency is determine by L(primary winding) and C ( resonance capacitor) ?

nyemi

Hi Shamino

There are two ideas that may resolve the problem.




Read the scr's soul.
http://www.nxp.com/documents/applica...te/APPCHP6.pdf

Factory cdi ignition core size.
It's not small.

Nav-Aids

Shamino, the point is that the more power you output the more heat that needs to be dissipated. Power and heat is based on the energy stored and released plus the number of cycles (frequency or rpm), the higher the frequency the more heat is generated. You either live with the power level you have or reduce it by whatever means you have like, resistance, impedance, or voltage..etc. MSD ignitions can draw up to 14 amps or more at high rpm and yes they get hot.

Calculate for the primary only.



or use the website calculator: http://www.1728.org/resfreq.htm

Ray

shamino

Thanks nyemi and NAV-Aids !

the first block limit the charging voltage to 133 + 150 V to protect ignition coil or limit power consumption ?
the second block turn off ( self commutation) the main SCR before capacitor discharge completely ?

my circuit use pickup pulse from flywheel directly without PIC microcontroller , so i must add second block to turn off main SCR sooner to save some power ?

i will try both solution , add some component and use bigger transfomer Core.

// my current pcb is 42mm x 66mm , it's fit in plastic box i have , the bigger box is 65mm x 90mm so if i add some component or bigger core , i must use bigger box . that's the problem ^^

CheeseE

Hi Guys,

please feel free to try out my timer board. It is based on pic 16f628a at 16Mhz. UI is written in Java. Android app is in progress
if you have any questions please ask it here or by email.
http://csa-electronic.wix.com/index

CheeseE

t1d

I have been doing my "homework" on a Homemade CDI for my Homelite 26cc conversion. I have read the threads, here, and chased the subject all over the internet. So, I am not putting off my responsibility to do the research, when I ask for your help.

I would greatly appreciate a simple listing, with links, of Homemade RC CDI's that are complete, working properly, and have the PCB layout, or schematic, parts manifest and programming freely available. I appreciate your help, as I am greatly confused. This might well be placed under a separate thread, with a title noting the summation and comparing the pros/cons of the various units.

Thank you so much for your help and valuable time and effort to reply. My electronics skills are limited and I am having a tough time sorting this out.

Edit: Part of the answer is here. See post #1 and #4.
http://www.rcgroups.com/forums/showthread.php?t=1781959