Successful TPU-ECD replication !

[z_p_e]

@Ronotte and all that may be interested.

I did a new sim on Otto's and Roberto's circuit as per their document, and Roberto's coil specs. The results are shown in the attached pdf.

I used a very small inductance for the bulb, and showed scope shots with and without an output diode.

A single frequency f1 at 55kHz was used. Results are quite different than sim01.

Let me know if there's anything you want changed or that you would like me to try.

Regards,
Darren

[ronotte]

Hi Darren,

it's very interesting, now I can see that the waveform on pulse leading edge is similar to that ECD. Just in order to be able to compare the results could you please run the following tests?:

- 1 coil 1 freq (ok 55KHz).. In this situation you should see no sinus trace, jus bursts of RE
-1 coil 2 freq (55KHz, 60 KHz)...In this situation you should see a complete different burst of RE: the peaks are summing up and on ZERO point only you should see the piece of sinus appearing at 50KHz.

I forgot to say that generally I put scope probe on ZERO and PHASE (scope ground is to PS ground) and please in all the tests take out for the moment the diode as the load is always direct connected.

Thanks very much

Roberto

[duff]

.

[Thaelin]

@ Jason:
   This is actually not really related here but then it is. I am so taken with the scope that you have in the background that I would love to know who makes it and the specific model number. I am in the market for a new one and want a good one to boot. Thanks

sugra

[z_p_e]

Hi Darren,

it's very interesting, now I can see that the waveform on pulse leading edge is similar to that ECD. Just in order to be able to compare the results could you please run the following tests?:

- 1 coil 1 freq (ok 55KHz).. In this situation you should see no sinus trace, jus bursts of RE
-1 coil 2 freq (55KHz, 60 KHz)...In this situation you should see a complete different burst of RE: the peaks are summing up and on ZERO point only you should see the piece of sinus appearing at 50KHz.

I forgot to say that generally I put scope probe on ZERO and PHASE (scope ground is to PS ground) and please in all the tests take out for the moment the diode as the load is always direct connected.

Thanks very much

Roberto

No problem, I'll run these tests and include all PSpice info as well.

Just to clarify though, I want to be sure what you want me to do.

When you say one coil, do you want me to disconnect the other two coils from the circuit?

When you say one coil, 2 frequencies, am I to use 2 switches in parallel and drive one switch at 55kHz, and one switch at 60kHz?

So when you scope the ECD, you always have your scope ground on PS ground, and then you either scope the ZERO or PHASE terminals? If so, that should change things. I always assumed you were scoping across the bulb. Please clarify.

Note that the way I am scoping in the sim is across the bulb. It is a differential measurement.

Attached here is the PSpice netlist, .cir files etc.

Darren