Abstract
This paper discusses the current total harmonic distortion (THDi) and voltage ripple minimization of SEPIC converter based on parameters design optimization. This conventional PFC SEPIC converter is designed to operate in discontinuous conduction mode in order to achieve almost unity power factor. The passive components, i.e., inductor and capacitor are designed based on switching frequency and resonant frequency. Meanwhile, the ranges of duty cycle for buck and boost operations are between 0<D<0.5 and 0.5<D<1, respectively, for the output voltage variation of the converter. The principle of the parameters design optimization is based on the balancing energy compensation between the input capacitor and output inductor. The experimental results show that, the current THD is reduced to 2.66% from 70.9% after optimization process is conducted. Furthermore, it is confirmed that the output voltage ripple frequency is always double from the input line frequency, fL = 2foutand the output voltage ripple is always lower than the maximum input voltage ripple. Therefore, the designed parameters of the experimental converter is confirmed with approximately 65 W of the converter output power.
Highlights
In recent years, portable electronic equipment has advanced from a power converter and has the advantages of high efficiency, small in size and possess a wide input and output voltage ranges [1]–[3]
When the same specifications and parameters of the SEPIC converter are applied in the conventional PFC SEPIC converter, the current THD and output voltage ripple become high
The experimental results have shown a good agreement with the designed results
Summary
Portable electronic equipment has advanced from a power converter and has the advantages of high efficiency, small in size and possess a wide input and output voltage ranges [1]–[3]. The use of bridge rectifier, transformer, inductor, and capacitor can produce DC output voltage without distortion but will cause the input current to be extremely distorted. An AC/DC conversion are totally required in PFC converters to ensure the input voltage and input current are purely sinusoidal. A conventional PFC converter circuits consist of combination between full-bridge rectifier and SEPIC converter. The energy from the output full-bridge rectifier must be transferred to the SEPIC converter effectively without any ‘extra’ energy. If the energy is not effectively transferred, the input current THD can be affected at the input side and increase the output voltage ripple. In order to solve the problems, conventional PFC SEPIC parameters require to be optimized where minimization current THD and the output voltage ripple are considered. The PWM signal given to the switch is generated by using Altera DE2 as in [12], [13]
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