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This paper proposes a switching method and a LC design method in order to suppress the distortion of the input current which occurs in a high efficiency AC-AC converter. The proposed AC-AC converter which is used in online-type Uninterruptible Power Supplies (UPS) is constructed by a T-type three-level rectifier and a T-type three-level inverter. The switching loss of the proposed AC-AC converter...
This paper proposes an AC-AC converter, which consists of T-type three-level rectifier and inverter, for an on-line UPS. The switching loss of the proposed AC-AC converter is drastically reduced because the proposed converter is driven at a very low switching frequency which is six times of input side frequency. The T-type rectifier separates the maximum phase-voltage, medium phase-voltage and minimum...
This paper proposes a space vector modulation based on the virtual AC/DC/AC conversion method for a matrix converter to reduce the switching loss. The switching loss of the matrix converter is not decided by only the number of switching times but also depending on the voltage and current in the selected switching devices based on the modulation. The proposed method can minimize the maximum instantaneous...
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