Loading
Loading
Review of Case Materials
Reviews records, documents, testimony, data, and other relevant materials and consults with counsel regarding technical issues related to the matter.
Provide Expert Analysis
Applies specialized knowledge and experience to evaluate the technical or professional issues involved.
Form Expert Opinions
Develops independent, supportable opinions based on the available evidence and relevant standards.
Prepare Expert Reports
Prepares clear, well-supported expert reports outlining methodology, analysis, findings, and opinions.
Provide Deposition Testimony
Explains findings and opinions under oath and responds to questioning during deposition testimony.
Testify in Court
Presents specialized findings and opinions clearly to judges, juries, arbitrators, or other decision-makers.
Showing Results 0 of 0
A high-frequency transformer core can saturate when magnetic flux density is driven beyond the usable range of the core material. Relevant factors may include the applied voltage waveform and volt-seconds, switching frequency, duty cycle, winding turns, core geometry and material, operating temperature, DC bias, and asymmetry between switching intervals. In bridge, half-bridge, or push-pull converters, unequal volt-seconds between alternating phases can produce flux imbalance and progressively shift the operating point toward saturation. Waveform measurements and magnetic calculations can be compared with core data to determine whether excessive flux excursion, incomplete reset, or flux imbalance is consistent with the observed current or heating.
Skin effect and proximity effect make alternating current distribute unevenly within transformer windings at higher frequencies. Skin effect concentrates current toward conductor surfaces, while proximity effect redistributes current because of magnetic fields from nearby conductors. Both can increase effective AC resistance and copper loss above the value predicted from DC resistance alone. Their significance depends on frequency, conductor dimensions, winding layers, spacing, current waveform, and magnetic-field distribution, so techniques such as litz wire, foil, interleaving, or planar construction should be evaluated for the specific winding geometry rather than assumed to reduce loss automatically.
Leakage inductance can be evaluated from electrical measurements, winding geometry, analytical calculations, or electromagnetic modeling. It depends strongly on the spacing and coupling between primary and secondary windings, including insulation thickness, winding breadth, number of layers, and whether the windings are interleaved. Lower leakage inductance can reduce ringing or voltage stress in some converter topologies, while certain resonant or soft-switching designs may intentionally use a controlled amount of leakage inductance as part of circuit operation.
A high-frequency transformer can overheat even when RMS load current appears acceptable because total heating depends on both winding loss and core loss. Frequency-dependent AC winding resistance, skin and proximity effects, harmonic current content, core material, flux swing, switching frequency, waveform shape, insulation arrangement, and cooling conditions can all contribute to temperature rise. Core and winding losses may also respond differently to input voltage, load, and converter topology, so current alone is not sufficient to assess thermal performance. Waveform measurements, temperature data, winding resistance, and core-loss estimates should be evaluated together.
