12vrms. probe shows 10kv 500v 1.7kv wtf!!

[Arthur92710]

Well thank you for all your help so far.
  How long will it take for it to come back from T.S.?

[lacy]

I have no idea on how long it may take them. I sent them another circuit about a month ago and haven't heard nothing from that yet. I don't work for NI, I am just a user with a good deal of experience with Multism and circut troubleshooting (my profession is Electronic Repair) that has volunteered to try and help on the forum when I can.

I hope they will not take long at least giving us their opinion on it. If it is a software issue, then we will have to wait until they decide to release any fixes to the software and I don't know when that will be. I have a post requesting any information as to the status of any updates, but it has not been answered yet.

I wish I could help more, but I don't have any more ideas or information.

Have A Nice Day

[Maxish]

Hello,

I ran transient analysis for about 250us simulation time, probing all circuit nodes. I am not seeing any of these values. I see ~150V at some nodes, but nothing in the 10kv range!

And your attached does not have a probe. It has an oscilloscope.  Please give a better reproduce steps and/or attach another circuit

[lacy]

Hi Max,

I have tested this circuit and the problem is that you cannot measure the AC Line Voltage or Current with either the static probe or with the multimeter. I re-created his circuit in a fresh schematic and added parts while checking the voltage at the source. Everything was fine until I added the 555 timer to the regulator output and then the AC Voltage just disappeared. This,in my opinion is why he is seeing, strange values in the probe dialog box.

I will re-attach his circuit with the probe and multimeter attach for you to look at. I have also added comments where the I believe the problem is. Even if this happens to be incorrect, what I have found here still would need to be examined also.

Have A Nice Day.

[Arthur92710]

Ok max there was no 10kv this time. but dont you think its a bit werid if you have 150v from a 12vac supply?

[lacy]

I was going to refrain from commenting on this again, but I will re-iterate what I think the 150V problem is. As it stands you have the RF coil tied into the output of the Bridge rectifier. It is my opinion that the RF is being feed into the Bridge, rectified, and added to the 12VDC that is already there. If you tie the RF Coil to the output of the regulator, then the all the voltages, excecpt for the AC voltage appears normal.

It may not be the RF as much as the EMF of the coil causing a high voltage at this point. Either way, if you move the tie point of the RF Coil that will disappear. There may be another alternative that Max has that we don't know about yet.

I hope this helps some. I still want to here Max's opinion on both situations.

Have A Nice Day

[Maxish]

you're probing a 60Hz signal. How do you expect the instruments to capture the RMS voltage in us time? You have to simulate it long enough such at least a few cycle get in there - you need around 40ms for something to show up


About the 150V...why is it impossible to generate such voltage? you a complex RLC circuit which can resonate, and you have a diode that can clamp and build up voltages (look up voltage doubler circuits)

[lacy]

Thanks Max. That clears up the AC Voltage Situation that I was seeing. I really appreciate that.

Have A Nice Day.

[lacy]

I will make this my last comment on this circuit. I was going back and trying what Max said about not waiting long enough to view the AC Voltage and he was right. I failed to notice that the simulator time had slowed down after hooking up the timer. This is due to the higher frequency being produced by the timer. The higher the frequency the more time it takes to simulate a circuit.

While doing this I also checked about the 150V situation. If you set the simulator setting to set to zero, then this is not a problem. The voltage starts at zero and gradually builds up to near 13V and stays pretty much there. When I go back to Automatic determinination then it says 150V all the time. I thought this might be of some interest.

Anyway, I thank Max for pointing out my error and I hope some of this is helping.

Have A Nice Day.