Timeline for Unexpected output from LC circuit
Current License: CC BY-SA 4.0
21 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| S Jan 3, 2023 at 15:44 | history | suggested | Alesandro Giordano | CC BY-SA 4.0 |
claryfing text
|
| Jan 3, 2023 at 13:10 | review | Suggested edits | |||
| S Jan 3, 2023 at 15:44 | |||||
| Jan 2, 2023 at 18:38 | comment | added | Sredni Vashtar | I am beginning to think you misread the capacitor value (could it be 470 nF?) and possibly the inductance is a little higher too... | |
| Jan 2, 2023 at 15:05 | comment | added | Antonio51 | As you have a scope and a generator, can you plot the composite transfer function Vout (Vcapacitor) versus V input : varying frequency 1 Hz to 1 MHz. Internal generator impedance probably = 50 Ohm) | |
| Jan 2, 2023 at 15:00 | history | tweeted | twitter.com/StackElectronix/status/1609927509163794435 | ||
| Jan 2, 2023 at 13:47 | comment | added | Alesandro Giordano | @SredniVashtar wee need the transformer model/datasheet to build exactly the non-ideal model of the used transformer, check my posted answer | |
| Jan 2, 2023 at 13:41 | answer | added | Alesandro Giordano | timeline score: 1 | |
| Jan 2, 2023 at 11:54 | comment | added | Sredni Vashtar | @AlesandroGiordano my problem is with the numbers. Stray capacitance is so small that the frequency of the secondary oscillation should be higher than the primary oscillation (as shown in Antonio51's answer). Here it's the opposite. If the op is kind enough to invert primary and secondary of the transformer (of which we know nothing) we can get a better idea of what is going on. | |
| Jan 2, 2023 at 9:04 | comment | added | Antonio51 | Open circuit are "never" really open. The parasitic capacitor "closes" the circuit, because always present. | |
| Jan 2, 2023 at 4:45 | comment | added | Vasanth Sadhasivan | Makes sense to me. When I go and simulate two coupled RLC circuits as well, I see this behavior pop up as well. I guess a follow up would be to understand how and why even when we have an open circuit on the other transformer coil, current still is induced? | |
| Jan 2, 2023 at 4:43 | vote | accept | Vasanth Sadhasivan | ||
| Jan 2, 2023 at 2:13 | comment | added | Alesandro Giordano | In my opinion this is caused by the transformer, where the two coupled inductors are introducing this frequency behavior | |
| Jan 1, 2023 at 18:15 | comment | added | Sredni Vashtar | Ok I ran the numbers and it seems that the legit oscillation is the short lived one, with a period of about 25 us, and not the long one. Can you show your setup when all the cables are attached? Has your generator a 50 ohms series resistance? I can replicate something similar by simulating the probes and scope capacitance, but it's an exponential approach and not that big oscillation. | |
| Jan 1, 2023 at 14:06 | comment | added | Sredni Vashtar | Also, why isn't input ground connected to the ground rail? | |
| Jan 1, 2023 at 5:04 | comment | added | Vasanth Sadhasivan | Just added some more info, not a simulation but what Im reading from a scope. I added a 'naive' version of the circuit, not accounting for any things like wire resistance etc. Thanks for the help! | |
| Jan 1, 2023 at 5:03 | history | edited | Vasanth Sadhasivan | CC BY-SA 4.0 |
added 255 characters in body
|
| Dec 31, 2022 at 13:31 | comment | added | Alesandro Giordano | Is this a simulation? Please provide also schematics | |
| Dec 31, 2022 at 13:01 | answer | added | Antonio51 | timeline score: 1 | |
| Dec 31, 2022 at 10:24 | comment | added | Andy aka | Please provide data sheets for the components and draw the circuit with particular attention to the specific wires you used on the transformer. | |
| S Dec 31, 2022 at 9:02 | review | First questions | |||
| Dec 31, 2022 at 10:10 | |||||
| S Dec 31, 2022 at 9:02 | history | asked | Vasanth Sadhasivan | CC BY-SA 4.0 |