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Analysis, design and control of a two stage improved power quality telecommunication power supply
This paper deals with the power quality improvement at the utility interface of a telecommunication switched mode power supply (SMPS) of 12 kW rating. The first stage of this SMPS consists of a 6–pulse diode bridge converter that performs ac–dc conversion yielding an unregulated dc voltage. In the second stage, two boost rectifiers are connected together which feed to a boost dc–dc full bridge converter connected to the output load. By means of a closed loop control, appropriate value of third harmonic component of the current is injected using a zig–zag transformer to reduce the current harmonics distortion at the utility interface. A detailed design procedure is presented to select various components of the SMPS system.
Keywords: power quality, boost rectifier, total harmonic distortion, THD, switched mode power supply, SMPS, power factor, boost dc–dc full bridge converter, telecommunications power supply, quality improvement, zig–zag transformers
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