New methods for digitally controlled bridgeless PFC converters

In order to attain sustainable energy economics, topics like energy generation and transmission should be discussed in connection with the influences of energy consumption. With regard to the future energy system the topic 'renewable and novel energy generation' is only one part which should be focused. Furthermore, novel technologies for power consumption also play a major role. Especially the efficiency of consumer electronic devices, with focus on their power supply units, provides a high potential for energy saving, because of the high amount of used units. This article outlines novel methods to realize modern and highly efficient power supplies. The primary goal is to achieve an operation efficiency better than 96 % specifically for bridgeless boost power factor correction (PFC) converters. This will be possible due to new digital control methods combined with the suitable circuit topology. As this report explains, a basic bridgeless boost PFC stage could operate with a digital control at which the feedback values are only based on a voltage measurement over the PFC-choke and a DC-link voltage measurement.