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Due to their high reliability and luminous efficacy, HB-LEDs are being widely used in lighting applications and, therefore, their power supplies are required to have also high reliability and efficiency. A very common approach for achieving this in ac-dc applications is using a two-stage topology. The Power Factor Corrector Boost converter operating in Boundary Conduction Mode is a very common converter...
In recent years, there has been a great effort to increase the efficiency of Radio Frequency Power Amplifiers. This can be achieved by using techniques such as Envelope Tracking and Envelope Elimination and Restoration. These techniques require DC/DC converters capable of changing its output voltage very fast, in order to reproduce the envelope of the signal being amplified by the Radio Frequency...
When a power factor corrector (PFC) is designed with a relatively fast output-voltage feedback loop, the static and the dynamic behaviour of the power stage is different to that obtained with a slow output-voltage feedback loop. This is because of the influence of the voltage ripple that is present on the control signal. This voltage ripple generates a parasitic feedback loop, which is different to...
This paper presents a complete analytical switching loss model for power MOSFETs in low voltage switching converters. Traditionally, the piecewise linear model has been used to obtain both switching losses and efficiency in these converters, due to its simplicity and good performance. However, the use of the latest low voltage power MOSFET generations and the continuous increase of the switching frequencies...
In this paper an approach to modelling double converters is presented. With these converters two fully regulated outputs can be obtained, controlling the duty ratio and the frequency of the power switch. The modelling method is based on the well-known averaged methods, adapted to consider the influence of the frequency variations in both outputs. As a result, the canonical circuits of the buck, boost,...
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