AC-CDI 2 DC-CDI

This circuit turns an AC-CDI into a DC-CDI.

An AC-CDI needs a working STATOR to charge. If the stator fails, let it be rewind or buy a new one is pretty expensive!
This circuit was designed to bypass the faulty stator by making High Voltage (around 100 to 200V) directly from the +12v battery.

When the internal SCR of the AC-CDI has been latched in ON state for a spark, only the voltage crossing a falling zero will turn it OFF again. In order to let the SCR return to blocking state, this circuit alternates ON and OFF states.


  • 50 to 20,000 RPM
  • Kill switch
  • Power supply voltage DC 12 volts
  • Current drain: 60mA to 1.3A
  • 2A Fuse Protection
  • Common ground between 12Vdc and HV
  • Dimensions: 75 x 50 x 25mm (3 x 2 x 1 inch)
  • Available Ready to use in the SHOP section.
  • or as separated parts: PCB plus Firmware

Diagrams
Schematic
Wiring to an ACCDI


Jumpers
FRQ solder pad:
If open (default): Frequency of the circuit is 1000Hz (equal to 6 pulses/rotation at 10000RPM)
If close: Frequency of the circuit is 500Hz (equal to 3 pulses/rotation at 10000RPM)

PWM solder pad:
If open(default): HV generator alternate ON/OFF period at 50% (Maximum output voltage = +220Vdc)
If close: HV generator alternate ON/OFF period at 33% (Maximum output voltage = +140Vdc)


Led
When the module is powered on, LED blink 3 times meaning programing is OK.
Led is ON when output voltage is too high and overvoltage regulation works.
Led is OFF when output voltage is OK (not too high)


Kill switch
Remove the KILL wire from the ACCDI and connect the Kill Switch to this Power module
If Kill input is connected to Ground: DC generator stops and Led turns ON.


OVP
Over Voltage Protection: Turn the trimmer to adjust the maximum output voltage from +100v until +220v.
Led turns ON when OVP (aka regulation) is active.

Transistors need heatsinks if this unit run at 10.000rpm longer then 1 minute.

Blue: Mosfet Gate. Yellow: DC output


PHOTOS.

Click here for more info

 


VIDEOS.

Click here for more info

 

10.000rpm:

15.000rpm:


VERSIONS

  • Version V1R2C1:
    • First Version.
  • Version V2R0C0:
    • [soft] Improvements.

  • Version V2R0C1:
    • [hard] Change PCB layout.
    • [soft] 2 PWM DutyCycles.
    • [soft] Led blinks at startup.

10 thoughts on “AC-CDI 2 DC-CDI”

  1. Hi Thierry
    Sorry to write you again but I just saw that you are doing something similar to what I asked you in the previous email AC CDI 2DC CDI and I see that you do not have it for sale yet but you could send me the program and the PCB to go doing tests.
    Thanks Jose Luis

  2. Hi
    I recently bought this cirquit board
    but there is no wiring diagram anywhere in the letter or on this site.
    How do I connect the AC-DC board to the AC-DC CDI v2,5?
    Please include a wiring diagram to the products you sell please.
    Also, there is no way to contact you in another way than this forum

  3. Hi Thyerri
    I received the printed circuit this morning and mounted it but I can’t get the output voltage to change or the LED to turn on and also if I try to change the frequency, I don’t see any change in the oscilloscope.
    Am I using the V2R0C0 software on the printed circuit you sent me? Could this be the problem?

    1. >I don’t see any change in the oscilloscope.
      WHERE ?? I cannot guess where you hook the probe

      >Am I using the V2R0C0 software on the printed circuit you sent me? Could this be the problem?
      No but I’ll send you last V2R0C1 where led blinks 3 times if PIC and programing are OK.

  4. Hi Thierry
    I just tried the new software and it seems that it works when I regulate the potentiometer the Led turns on. I give you the voltage measurements that give me a Maximum 184V and at 130V the Led turns on and the minimum is 95v and consumption is at 0.07Amp. So far I think everything is fine but now I have another problem that had not arisen before and is that when I connect it and without giving any pulse at the PIKUP input on the CDI.
    The AC CDI 2 DC CDI generates pulses in the CDI with constant frequency and I have changed the software to the old one I used before and it does the same.
    And I did another test with an inverter with a normal 220V output transformer and it works perfect. Could you help me fix it.
    Thanks a lot

    1. Then the AC to DCCDI module is working fine with V2R0C1 firmware.

      >when I connect it and without giving any pulse at the PIKUP input on the CDI.
      You are ignoring the power of EMI/Electrical noise !
      DC converter is a high speed switching device and it makes a lot of surge!
      When you let the CDI pickup input, it act like a antenna and trigger on every spike in the air !!!
      NEVER NEVER let input disconnected when dealing with DC inverter!

      >a normal 220V output transformer and it works perfect
      Of course a simple 220v main transformer is sinus and just 50Hz , not square signal and 1KHz ! So it doesn’t make parasitic noise!

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