Independent Control of Inductor Current and Output Voltage of Interleaved PFC Boost Converter using Approximate 2-Degree-of-Freedom

Kohki Ishikawa, Yohei Mochizuki, Kamon Jirasereeamornkul


Making power factor and harmonics distortion of power supply better are needed. An interleaved boost converter is used for an active PFC (Power Factor Correction) for reducing ripples. In the PFC boost converter, if a duty ratio, a load resistance and an input voltage are changed, the dynamic characteristics are varied greatly. This is a prime reason of difficulty of controlling the PFC boost converter. In this paper, an independent control of an inductor current and an output voltage of the interleaved PFC boost converter using A2DOF (Approximate 2-Degree-Of-Freedom) is proposed. Experimental studies using a micro- processor for the controller demonstrate that the proposed digital control is effective to improve power factor and to suppress the output voltage variation at the load sudden change.


AC-DC power converters, Approximate 2-Degree-Of Freedom (A2DOF), Digital control, Interleaved boost converter, Micro-processor, Power factor Correction (PFC), Robust control

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