# ZVS Buck Error Inductor Current

**URL:** <https://forum.plexim.com/t/zvs-buck-error-inductor-current/2248>\
**Category:** PLECS\
**Tags:** inducor-current\
**Created:** [June 6, 2025, 3:19pm UTC](https://forum.plexim.com/t/zvs-buck-error-inductor-current/2248 "2025-06-06T15:19:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![GJHost](https://avatars.discourse-cdn.com/v4/letter/g/9fc348/32.png) [@GJHost](https://forum.plexim.com/u/GJHost)\
**Post date:** [June 6, 2025, 3:19pm UTC](https://forum.plexim.com/t/zvs-buck-error-inductor-current/2248/1 "2025-06-06T15:19:40Z")

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Hello, I’m new to PLECS and I can’t get a resonant ZVS buck circuit to run. When I simplify the circuit by replacing the buck converter with a 5 A DC current source, I get an error:

\*\*State/source-dependence during switching.  
The state

- BuckZVS1/Lr  
is directly dependent on the source(s)
- BuckZVS1/I\_dc\*\*

I don’t know how to fix this.

 ![ZVS C](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/2X/a/a4ce396d39ae7ae94911d7a305a380386c0e0497.jpeg)

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**Author:** ![Bryan\_Lieblick](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/bryan_lieblick/32/10_2.png) [@Bryan\_Lieblick](https://forum.plexim.com/u/Bryan_Lieblick)\
**Post date:** [June 6, 2025, 3:29pm UTC](https://forum.plexim.com/t/zvs-buck-error-inductor-current/2248/2 "2025-06-06T15:29:41Z")

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Please see this [FAQ on the Plexim website](https://www.plexim.com/support/solutions/166). There also is a section on the user manual dedicated to this error message. See “Using PLECS + Error Messages + State-source dependency of components”. In your case the issue arises because of a conflict between the inductor current and the DC current source.

One approach from the manual:

> Introduce a relatively large parallel resistance with the current source in order to break the inductance/current source dependency.