EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: state_of_flux on August 15, 2023, 12:20:04 pm
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Hello all,
I am designing a CCPS and using a phase-shifted, series-resonant bridge as the switching topology. There is a DC block capacitor in series with the transformer primary winding.
After fleshing out a full simulation, I decided to validate the transformer design in the simulator. I found that, moments before the initiation of a new pulse, the transformer voltage begins to oscillate at a very low frequency of approximately 15kHz. This has happened in both my SPICE simulator and PLECS simulation software. This causes the transformer to saturate immediately, and the waveforms from here onwards get progressively worse.
This does not entirely make sense to me as the PWMA-PWMD are clearly not switching. However, both SPICE and PLECS are showing this oscillation, so I must be missing something.
Has anyone seen any thing similar to this and have a suggestion as to what may be causing it/potential fix or whether it is a simulation artifact?
Best,
SoF