Analysis of Various Transformer Structures for High Frequency Isolation Applications

High-Voltage Power Supply for High Repetitive Rate Marx Generator with Quasi-Resonant Zero-Current Switching Transistor Control Algorithm

“…The phenomenon of parasitic capacities is usually undesirable, as it causes a number of problems related to high-voltage high-frequency transformers, which cannot be ignored and necessitate a change in the approach to the design of HV power supplies [21]. These capacities cause distortions of the currents flowing in the primary and secondary windings of the transformer, causing the occurrence of higher harmonics of these currents, increasing energy losses both in the windings related to the winding resistance (caused by a higher current value and the skin effect), losses on semiconductor elements and in the power supply [22], forcing additional cooling or increasing the size of the elements used, including the transformer core [23,24]. Moreover, this phenomenon may also cause the occurrence of electromagnetic disturbances [22,25] and difficulties with control (especially in the case of resonant converters), and affect the output voltage of the transformer.…”

Filter-Clamped Two-Level Three-Phase Transformerless Grid-Connected Photovoltaic Inverter for Leakage Current Reduction

“…Line-frequency isolated transformers are bulky; it makes the PV inverter large and heavy, which is difficult to carry and install. In comparison, Transformer-less (TL) PV grid-connected systems benefit from improved size, cost, weight, and efficiency [6][7][8][9][10][11][12][13][14]. Additionally, three-phase inverters will not suffer from double-line-frequency ripples at the dc-link and thus smaller capacitive filters will be sufficient to maintain the voltage in the dc-link [15][16][17][18], making the entire system more reliable [19].…”