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A control strategy to operate a hybrid multilevel inverter is described in this paper. The inverter produces seven-level PWM voltage waveforms using twelve transistors and a three-phase transformer for harmonic elimination offering the following advantages: flying capacitors with neutral clamped circuits are not required, a small number of switching devices is used and the PWM switching losses are...
A ZVT DC-DC converter with stray components integration is presented in this paper. The transformer leakage inductance and the MOSFET output capacitance are used to achieve the ZVT operation of the converter resulting in a high-frequency compact power converter. The circuit operation, the idealized waveforms and the methodology used to calculate the components are explained together with experimental...
This paper describes the techniques used to design a three-phase transformer which is a fundamental component of a 1 kW multi-level inverter. The transformer interconnects the outputs of two 6-pulse inverters to produce 12-pulse voltage waveforms at the output. The transformer transfers half of the throughput power to the inverter output. The design and construction of a 500 VA three-phase transformer...
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