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I am trying to simulate an oscillator in LTSpice.
So I tried to make a simple LC circuit.
Since a voltage source would not make the circuit oscillate,
I did not use a voltage source and made the capacitor start with 6 volts.
But for some reason the voltage just explodes and goes to almost 200kV.
I have no explanation for this phenomenon.
Maybe someone can help me with this.

https://i.stack.imgur.com/LxLSl.jpg

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  • \$\begingroup\$ Put realistic DCR in series with L and monitor current and compute energy \$\endgroup\$ Jan 18, 2021 at 22:26

1 Answer 1

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To expand a bit on Tony's comment, LTspice has a default series resistance of 1m\$\Omega\$ for an inductor, so you have an initial current of 6,000A.

Aside from being pretty unrealistic unless the inductor and core were enormous, that means that there is 18,000 J of energy stored in the inductor, so one would expect a peak voltage across the capacitor of about 190,000 V from conservation of energy.

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