This paper presents the successful use of fuzzy logic to derive a practical control scheme for boost converter with active power factor correction. Aspects of sudden changes in the load and the input voltage are discussed and presented. The fundamentals governing the design, control and performance are also illustrated. Properties of the proposed controller are: (1) converter with active power factor correction, (2) good performance of transient responses under varying loading conditions and/or input voltage, and (3) robustness around the operating point.