An electronic transformer, with an electronic device that converts the voltage of the mains into a DC and then through a semiconductor switching device, as well as electronic components and high-frequency transformer windings, constitutes a high-frequency AC voltage output, and is also an AC-inverter circuit described in the theory of electronics. Simply put, it consists mainly of a high-frequency transformer core (iron core) and two or more coils, which do not change position, from one or more electrical circuits, through AC power with electromagnetic induction, into AC voltage and current. At the output of a high-frequency transformer, one or more electrical circuits are supplied with high-frequency AC or direct current at different voltage levels.
Power Electronic Transformer (PET), also known as Electronic Power Transformer (EPT), Solid State Transformer (SST) and Flexible Transformer (FT), is a new type of transformer that enables energy transfer and power transformation through power electronics technology. The analysis and summary of the existing power electronic transformer topology can be made as follows: The so-called power electronic transformer is a static power equipment that combines the power electronic transformation technology with the high-frequency power transformation technology based on the principle of electromagnetic induction to realize the transformation of the electrical energy of one power feature into another. The power characteristics of electric energy referred to here mainly refer to the amplitude, frequency, phase, phase number, phase sequence and waveform of voltage (or current).
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