Using a GZ34/5AR4, with a 500V/120ohm PT, CLC of first cap of 40uF, a 1.2H/18ohm choke, then a 560uF cap with a load of 100mA, I get crazy graphs and an over-current error.
Is the choke too low in resistance/inductance and that is overstressing the GZ34? It's an old monster of thing, would I be better buying a 5H ~100 ohm one?
Thx
Is the choke too low in resistance/inductance and that is overstressing the GZ34? It's an old monster of thing, would I be better buying a 5H ~100 ohm one?
Thx
Things look all right to me. That is, without judging the quality of your supply, PSUD seems to handle it fine. Screen shot below.
http://www.just4sheep.com/site/images/PSUD.pdf
http://www.just4sheep.com/site/images/PSUD.pdf
Hi
Sorry made a mistake in my original post the power transformer is 850VCT, or 425-0-425
I get it, you have to highlight the graph and drag it to rescale.
Hmmm, looks like I'm getting 400mA pulses through the GZ34, my choke must need more inductance/resistance...
Sorry made a mistake in my original post the power transformer is 850VCT, or 425-0-425
I get it, you have to highlight the graph and drag it to rescale.
Hmmm, looks like I'm getting 400mA pulses through the GZ34, my choke must need more inductance/resistance...
Didn't get a chance to run the sim, but by looking at your values it seems like a tough load for the rectifier durring the power up cycle(if the rectifier you are refering to does cross-reference the 5AR4). Especially in a worst case, real-world situation, like tubes are warmed up then you power it off, then back on before they are cooled down.
I'd either,
- Reduce capacitance
- Increase L and or R (you could just add a resistor in series with the choke if you already own the choke and have the voltage headroom to do so)
- Change rectifier type
Or a combination.
I'd either,
- Reduce capacitance
- Increase L and or R (you could just add a resistor in series with the choke if you already own the choke and have the voltage headroom to do so)
- Change rectifier type
Or a combination.
The over-current error is probably caused by using a constant current load instead of the equivalent resistor load. The sim assumes that the load will draw the specified current from the start, which of course it won't.
Make sure you set the right resistance readings for your transformer. That threw me off for a long time.
I've had similar problems with 'constant current draw'....which of course a plate wont do. Set the stepped load option to say, after ~1s just to keep the simulator happy that it's let the voltages get up a little before drawing the load
L
L
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