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- 저자 : S. Farhangi (검색결과 3 건)
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A Novel Soft Switched Topology for Power Factor Correction with Load Isolation Capability
M. Yazdanian,S. Farhangi 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
A novel topology for single phase single stage isolated power factor correction (PFC) based on boost converter has been suggested in this paper. This PFC operates in continuous conduction mode (CCM) with constant switching frequency which injects minimum of harmonic into the power system. The leakage inductor in high frequency transformer of the insolated PFC causes voltage impulses which can damage the semiconductor switches. The proposed topology provides ZCS by control of the leakage inductor current, which suppress the aforementioned impulses, in addition of diminishing the switching losses. A simple predictive controller is used to calculate the switching times which reduces the sampling rate and complexity.
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Distributed Power Supply with Power Factor Correction
M. Saghaleini,S. Farhangi 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
The idea of power electronic transformer (PET), which works with solid-state switches, has been considered noticeably recently. Every power electronic transformer has several parts which each of them needs its own reliable supply voltage. So the appropriate performance of a PET depends on the existence of various proper supply voltages. The distributed power supply (DPS), which can produce several different supply voltages simultaneously with various powers and high reliability, may be the optimum choice available for the supply of different modules of a PET. In this paper the idea of a distributed power supply with proper topology for a PET has been introduced and its performance and effects on the network has been demonstrated by simulation.
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A Novel Optimization Method for Solving Harmonic Elimination Equations
A Samadi,S. Farhangi 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper proposes an optimization method for solving nonlinear equations of both selective harmonic elimination PWM and staircase fundamental switching waveforms. The proposed method finds all set of solutions irrespective of the switching angle numbers. The proposed optimization method is based on Mathmatica Optimization Toolbox. The suggested method can overcome the drawbacks associated with harmonic elimination problem. In contrast to the results reported in previous works, the approach here produces all possible solutions without computational and human efforts.
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