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A robust digital PFC control method suitable for low-cost microcontroller

: Hofmann, A.; Baumüller, A.; Gerhardt, T.; März, M.; Schimanek, E.

3rd International Conference on Integrated Power Systems 2003. Proceedings
Nürnberg, 2003
International Conference on Integrated Power Systems (CIPS) <3, 2003, Nürnberg>
Fraunhofer IISB ()
power factor correction; digital control; current mode; continuous conduction mode

This paper describes the basic principles and experimental results of a digital control method for switching power converter operating in continuous correction mode (CCM). The method is especially suitable for boost converter in power factor correction applications. In contrast to other well known approaches, the new method requires very low hardware and CPU resources and is thus well suited for low-cost 8 bit microcontroller. With that it becomes realistic that a microcontroller which is already available in most systems today becomes powerful enough to control an active PFC circuit or a switched mode power supply virtually in a sideline.