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Hello,
I am designing an LCC converter for a high voltage high frequency DC/DC converter. I have a question regarding the inclusion of transformer parasitics and a question regarding a simulation waveform I have.
First of all, the inclusion of parasitics. When looking at articles and research papers on the LCC converter, the transformer parasitic capacitance is included on the primary side of the transformer. However, doesn't the majority of capacitance appear on the secondary side? Therefore, wouldn't it first have to be multiplied by the transformer turn ratio so that the equivalent parallel capacitance across the primary participates in resonance? For example, if the secondary side capacitance is 1nF, and the turns ratio is 50. The actual capacitance seen on the primary side is 2.5uF, would this value be used in the primary side for simulation, or not? Should it be placed in the secondary as 1nF but the primary side resonant values be computed according to 2.5uF?
I have attached a waveform of the voltage and current in the resonant tank. For some reason, my voltage is clipped at a certain value, no matter what combination of Cs/Cp I choose. I understand this is a good quality of the LCC converter which prevents short circuit, but furthermore I understand it shouldn't do this in normal operation? Does anyone understand why it happens and how to fix it?
Thanks in advance,
J
I am designing an LCC converter for a high voltage high frequency DC/DC converter. I have a question regarding the inclusion of transformer parasitics and a question regarding a simulation waveform I have.
First of all, the inclusion of parasitics. When looking at articles and research papers on the LCC converter, the transformer parasitic capacitance is included on the primary side of the transformer. However, doesn't the majority of capacitance appear on the secondary side? Therefore, wouldn't it first have to be multiplied by the transformer turn ratio so that the equivalent parallel capacitance across the primary participates in resonance? For example, if the secondary side capacitance is 1nF, and the turns ratio is 50. The actual capacitance seen on the primary side is 2.5uF, would this value be used in the primary side for simulation, or not? Should it be placed in the secondary as 1nF but the primary side resonant values be computed according to 2.5uF?
I have attached a waveform of the voltage and current in the resonant tank. For some reason, my voltage is clipped at a certain value, no matter what combination of Cs/Cp I choose. I understand this is a good quality of the LCC converter which prevents short circuit, but furthermore I understand it shouldn't do this in normal operation? Does anyone understand why it happens and how to fix it?
Thanks in advance,
J
