Abstract
This paper presents multi-state and multilevel switching cells to generate high power non-isolated interleaved DC-DC, AC-DC, and DC-CA converters. The cells are classified in two groups; multistate switching cell (MSSC) based on autotransformer, and interleaved switching cell (ISC) based on inductors. Each switching cell has impedance based on small inductor, Lsh, connected between the legs, named current sharing circuit (CSC), which guarantees a zero average voltage between the terminals of the involved magnetic components, and thereby absorbs the PWM duty cycle differences. The small inductor causes duty cycle reduction; therefore its value should be very small. To verify the current sharing through the magnetic components, two Buck DC-DC converters with 1 kW output power, 200 V input voltage, 60 V output voltage, and 25 kHz switching frequency, was assembled and tested in laboratory.
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