We found a large pot core, shown in Figure 7b, which had a larger cross-sectional area, so we measured its magnetizing and leakage inductances at varying core gaps and frequencies.
Figure 8 also illustrates the performance of the pot core in context of the previous data.
Moving forward with the shorter secondary nested L-L and the large pot core transformers, we took power measurements in an open loop with a fixed duty cycle.
The pot core reached 91% resonant tank DC to DC efficiency, which did not meet our goal, but may have room for improvement.
Our hypothesis is the pot core will be better for EMI performance.