Estudio, desarrollo y modelado de nuevas topologías de convertidores CC/CC de múltiples salidas basadas en el control por modulación de anchura de pulso-retardo de pulso (PWM-PD)

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Most of the electronic systems need several voltages with different values to work. This supposes an important market demand of reliable, cheap and robust power supply with several output voltages. The specifications of these systems are very different and variable, for this reason a big number of solutions have been developed to supply the market. Nowadays, the main design tendencies in electronic systems are going towards higher power, ‘smaller size, lower voltages (3.3V, 1.5V, 0.9V), and, therefore, higher currents. These requirements penalize the use of classical multiple output converters, since only an output voltage is fully regulated by means of a specific loop control. Consequently, the multiple output converters with all the outputs fully regulated are being more and more used. For this reason, the multiple output converters based on postregulation have had an important expansion. Generally, most of the multiple output converters with postregulation are more expensive than classical solutions, specially, in medium and high power. Therefore, new topologies and strategies are needed to get cheaper multiple output converters fully regulated, and, in any case, to get new alternatives to the nowadays used. For these reasons, in this thesis an original and extensive family of converters is proposed. This new family is composed of converters with and without transformer, and, with and without postregulation. The converters belonging to this new family are named “PWM-PD Multiple output converters”, since they are based 011 the novel “PWM-PD Control” (Pulse Width Modulation-Pulse Delay). The PWM-PD control is presented in this document. Furthermore, several new topologies, a general design method, and a set of accurate small-signal models are proposed. Finally, several prototypes have been built to test both, the circuits and the models developed. These prototypes have corroborated the good operation of this new family of converters.
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